Reorganized the directory structure

lib/http/Makefile.am

@@ -0,0 +1,45 @@
+AUTOMAKE_OPTIONS = nostdinc
+
+CPPFLAGS_ALL_COMMON = \
+	-I$(top_builddir)/include \
+	-I$(top_srcdir)/include
+
+if WIN32
+# you must adjust the value of DEFAULT_MODPOSTFIX according 
+# to the first number in -version-info below
+CPPFLAGS_HTTPD_MOD = -DQSE_HTTPD_DEFAULT_MODPREFIX=\"libqsehttpd-\" -DQSE_HTTPD_DEFAULT_MODPOSTFIX=\"-1\"
+else
+CPPFLAGS_HTTPD_MOD = -DQSE_HTTPD_DEFAULT_MODPREFIX=\"$(libdir)/libqsehttpd-\" -DQSE_HTTPD_DEFAULT_MODPOSTFIX=\"\"
+endif
+
+lib_LTLIBRARIES = libqsehttp.la
+libqsehttp_la_SOURCES = \
+	httpd.h \
+	upxd.h \
+	http.c \
+	htre.c \
+	htrd.c \
+	httpd.c \
+	httpd-cgi.c \
+	httpd-dir.c \
+	httpd-file.c \
+	httpd-proxy.c \
+	httpd-std.c \
+	httpd-std-dns.h \
+	httpd-std-mod.h \
+	httpd-std-urs.h \
+	httpd-task.c \
+	httpd-text.c \
+	upxd.c
+
+libqsehttp_la_CPPFLAGS = $(CPPFLAGS_ALL_COMMON) $(CPPFLAGS_HTTPD_MOD) $(LTDLINCL)
+libqsehttp_la_LDFLAGS = -L../si -L../cmn -version-info 1:0:0 -no-undefined 
+libqsehttp_la_LIBADD = -lqsesi -lqsecmn $(SOCKET_LIBS) $(SENDFILE_LIBS) $(SSL_LIBS)
+
+if ENABLE_LIBLTDL
+libqsehttp_la_LIBADD += $(LTDL_LIBS)
+else
+libqsehttp_la_LIBADD += $(DL_LIBS)
+endif
+
+

lib/http/Makefile.in

@@ -0,0 +1,867 @@
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+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+
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+	libqsehttp_la-httpd-file.lo libqsehttp_la-httpd-proxy.lo \
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+	-I$(top_srcdir)/include
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+	httpd.h \
+	upxd.h \
+	http.c \
+	htre.c \
+	htrd.c \
+	httpd.c \
+	httpd-cgi.c \
+	httpd-dir.c \
+	httpd-file.c \
+	httpd-proxy.c \
+	httpd-std.c \
+	httpd-std-dns.h \
+	httpd-std-mod.h \
+	httpd-std-urs.h \
+	httpd-task.c \
+	httpd-text.c \
+	upxd.c
+
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+
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+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libqsehttp_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libqsehttp_la-upxd.lo `test -f 'upxd.c' || echo '$(srcdir)/'`upxd.c
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-am
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES)
+installdirs:
+	for dir in "$(DESTDIR)$(libdir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libLTLIBRARIES clean-libtool \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/libqsehttp_la-htrd.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-htre.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-http.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-cgi.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-dir.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-file.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-proxy.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-std.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-task.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-text.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-upxd.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
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+install-data-am:
+
+install-dvi: install-dvi-am
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+install-dvi-am:
+
+install-exec-am: install-libLTLIBRARIES
+
+install-html: install-html-am
+
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+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/libqsehttp_la-htrd.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-htre.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-http.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-cgi.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-dir.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-file.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-proxy.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-std.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-task.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd-text.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-httpd.Plo
+	-rm -f ./$(DEPDIR)/libqsehttp_la-upxd.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
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+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
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+pdf: pdf-am
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+ps: ps-am
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+ps-am:
+
+uninstall-am: uninstall-libLTLIBRARIES
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libLTLIBRARIES clean-libtool cscopelist-am \
+	ctags ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-libLTLIBRARIES install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am uninstall-libLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:

lib/http/htre.c

@@ -0,0 +1,320 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <qse/http/htre.h>
+#include "../cmn/mem-prv.h"
+
+static void free_hdrval (qse_htb_t* htb, void* vptr, qse_size_t vlen)
+{
+	qse_htre_hdrval_t* val;
+	qse_htre_hdrval_t* tmp;
+
+	val = vptr;
+	while (val)
+	{
+		tmp = val;
+		val = val->next;
+		QSE_MMGR_FREE (htb->mmgr, tmp);
+	}
+}
+
+int qse_htre_init (qse_htre_t* re, qse_mmgr_t* mmgr)
+{
+	static qse_htb_style_t style =
+	{
+		{
+			QSE_HTB_COPIER_DEFAULT,
+			QSE_HTB_COPIER_DEFAULT
+		},
+		{
+			QSE_HTB_FREEER_DEFAULT,
+			free_hdrval
+		},
+		QSE_HTB_COMPER_DEFAULT,
+		QSE_HTB_KEEPER_DEFAULT,
+		QSE_HTB_SIZER_DEFAULT,
+		QSE_HTB_HASHER_DEFAULT
+	};
+
+	QSE_MEMSET (re, 0, QSE_SIZEOF(*re));
+	re->mmgr = mmgr;
+
+	if (qse_htb_init (&re->hdrtab, mmgr, 60, 70, 1, 1) <= -1) return -1;
+	if (qse_htb_init (&re->trailers, mmgr, 20, 70, 1, 1) <= -1) return -1;
+
+	qse_htb_setstyle (&re->hdrtab, &style);
+	qse_htb_setstyle (&re->trailers, &style);
+
+	qse_mbs_init (&re->content, mmgr, 0);
+#if 0
+	qse_mbs_init (&re->iniline, mmgr, 0);
+#endif
+
+	return 0;
+}
+
+void qse_htre_fini (qse_htre_t* re)
+{
+#if 0
+	qse_mbs_fini (&re->iniline);
+#endif
+	qse_mbs_fini (&re->content);
+	qse_htb_fini (&re->trailers);
+	qse_htb_fini (&re->hdrtab);
+
+	if (re->orgqpath.buf) 
+		QSE_MMGR_FREE (re->mmgr, re->orgqpath.buf);
+}
+
+void qse_htre_clear (qse_htre_t* re)
+{
+	if (!(re->state & QSE_HTRE_COMPLETED) && 
+	    !(re->state & QSE_HTRE_DISCARDED))
+	{
+		if (re->concb)
+		{
+			re->concb (re, QSE_NULL, 0, re->concb_ctx); /* indicate end of content */
+			qse_htre_unsetconcb (re);
+		}
+	}
+
+	re->state = 0;
+	re->flags = 0;
+
+	re->orgqpath.ptr = QSE_NULL;
+	re->orgqpath.len = 0;
+
+	QSE_MEMSET (&re->version, 0, QSE_SIZEOF(re->version));
+	QSE_MEMSET (&re->attr, 0, QSE_SIZEOF(re->attr));
+
+	qse_htb_clear (&re->hdrtab);
+	qse_htb_clear (&re->trailers);
+
+	qse_mbs_clear (&re->content);
+#if 0 
+	qse_mbs_clear (&re->iniline);
+#endif
+}
+
+const qse_htre_hdrval_t* qse_htre_getheaderval (
+	const qse_htre_t* re, const qse_mchar_t* name)
+{
+	qse_htb_pair_t* pair;
+	pair = qse_htb_search (&re->hdrtab, name, qse_mbslen(name));
+	if (pair == QSE_NULL) return QSE_NULL;
+	return QSE_HTB_VPTR(pair);
+}
+
+const qse_htre_hdrval_t* qse_htre_gettrailerval (
+	const qse_htre_t* re, const qse_mchar_t* name)
+{
+	qse_htb_pair_t* pair;
+	pair = qse_htb_search (&re->trailers, name, qse_mbslen(name));
+	if (pair == QSE_NULL) return QSE_NULL;
+	return QSE_HTB_VPTR(pair);
+}
+
+struct header_walker_ctx_t
+{
+	qse_htre_t* re;
+	qse_htre_header_walker_t walker;
+	void* ctx;
+	int ret;
+};
+
+static qse_htb_walk_t walk_headers (
+	qse_htb_t* htb, qse_htb_pair_t* pair, void* ctx)
+{
+	struct header_walker_ctx_t* hwctx = (struct header_walker_ctx_t*)ctx;
+	if (hwctx->walker (hwctx->re, QSE_HTB_KPTR(pair), QSE_HTB_VPTR(pair), hwctx->ctx) <= -1) 
+	{
+		hwctx->ret = -1;
+		return QSE_HTB_WALK_STOP;
+	}
+	return QSE_HTB_WALK_FORWARD;
+}
+
+int qse_htre_walkheaders (
+	qse_htre_t* re, qse_htre_header_walker_t walker, void* ctx)
+{
+	struct header_walker_ctx_t hwctx;
+	hwctx.re = re;
+	hwctx.walker = walker;
+	hwctx.ctx = ctx;
+	hwctx.ret = 0;
+	qse_htb_walk (&re->hdrtab, walk_headers, &hwctx);
+	return hwctx.ret;
+}
+
+int qse_htre_walktrailers (
+	qse_htre_t* re, qse_htre_header_walker_t walker, void* ctx)
+{
+	struct header_walker_ctx_t hwctx;
+	hwctx.re = re;
+	hwctx.walker = walker;
+	hwctx.ctx = ctx;
+	hwctx.ret = 0;
+	qse_htb_walk (&re->trailers, walk_headers, &hwctx);
+	return hwctx.ret;
+}
+
+int qse_htre_addcontent (
+	qse_htre_t* re, const qse_mchar_t* ptr, qse_size_t len)
+{
+	/* see comments in qse_htre_discardcontent() */
+
+	if (re->state & (QSE_HTRE_COMPLETED | QSE_HTRE_DISCARDED)) return 0; /* skipped */
+
+	if (re->concb) 
+	{
+		/* if the callback is set, the content goes to the callback. */
+		if (re->concb (re, ptr, len, re->concb_ctx) <= -1) return -1;
+	}
+	else
+	{
+		/* if the callback is not set, the contents goes to the internal buffer */
+		if (qse_mbs_ncat (&re->content, ptr, len) == (qse_size_t)-1) return -1;
+	}
+
+	return 1; /* added successfully */
+}
+
+void qse_htre_completecontent (qse_htre_t* re)
+{
+	/* see comments in qse_htre_discardcontent() */
+
+	if (!(re->state & QSE_HTRE_COMPLETED) && 
+	    !(re->state & QSE_HTRE_DISCARDED))
+	{
+		re->state |= QSE_HTRE_COMPLETED;
+		if (re->concb)
+		{
+			/* indicate end of content */
+			re->concb (re, QSE_NULL, 0, re->concb_ctx); 
+		}
+	}
+}
+
+void qse_htre_discardcontent (qse_htre_t* re)
+{
+	/* you can't discard this if it's completed.
+	 * you can't complete this if it's discarded 
+	 * you can't add contents to this if it's completed or discarded
+	 */
+
+	if (!(re->state & QSE_HTRE_COMPLETED) &&
+	    !(re->state & QSE_HTRE_DISCARDED))
+	{
+		re->state |= QSE_HTRE_DISCARDED;
+
+		/* qse_htre_addcontent()...
+		 * qse_thre_setconcb()...
+		 * qse_htre_discardcontent()... <-- POINT A.
+		 *
+		 * at point A, the content must contain something
+		 * and concb is also set. for simplicity, 
+		 * clear the content buffer and invoke the callback 
+		 *
+		 * likewise, you may produce many weird combinations
+		 * of these functions. however, these functions are
+		 * designed to serve a certain usage pattern not including
+		 * weird combinations.
+		 */
+		qse_mbs_clear (&re->content);
+		if (re->concb)
+		{
+			/* indicate end of content */
+			re->concb (re, QSE_NULL, 0, re->concb_ctx); 
+		}
+	}
+}
+
+void qse_htre_unsetconcb (qse_htre_t* re)
+{
+	re->concb = QSE_NULL;
+	re->concb_ctx = QSE_NULL;
+}
+
+void qse_htre_setconcb (qse_htre_t* re, qse_htre_concb_t concb, void* ctx)
+{
+	re->concb = concb;
+	re->concb_ctx = ctx;
+}
+
+int qse_htre_perdecqpath (qse_htre_t* re)
+{
+	qse_size_t dec_count;
+
+	/* percent decode the query path*/
+
+	if (re->type != QSE_HTRE_Q || (re->flags & QSE_HTRE_QPATH_PERDEC)) return -1;
+
+	QSE_ASSERT (re->orgqpath.len <= 0);
+	QSE_ASSERT (re->orgqpath.ptr == QSE_NULL);
+
+	if (qse_isperencedhttpstr(re->u.q.path.ptr))
+	{
+		/* the string is percent-encoded. keep the original request
+		 * in a separately allocated buffer */
+
+		if (re->orgqpath.buf && re->u.q.path.len <= re->orgqpath.capa)
+		{
+			re->orgqpath.len = qse_mbscpy (re->orgqpath.buf, re->u.q.path.ptr);
+			re->orgqpath.ptr = re->orgqpath.buf;
+		}
+		else
+		{
+			if (re->orgqpath.buf)
+			{
+				QSE_MMGR_FREE (re->mmgr, re->orgqpath.buf);
+				re->orgqpath.capa = 0;
+			}
+
+			re->orgqpath.buf = qse_mbsxdup (re->u.q.path.ptr, re->u.q.path.len, re->mmgr);
+			if (!re->orgqpath.buf) return -1;
+			re->orgqpath.capa = re->u.q.path.len;
+
+			re->orgqpath.ptr = re->orgqpath.buf;
+			re->orgqpath.len = re->orgqpath.capa;
+
+			/* orgqpath.buf and orgqpath.ptr are the same here. the caller
+			 * is free to change orgqpath.ptr to point to a differnt position
+			 * in the buffer. */
+		}
+	}
+
+	re->u.q.path.len = qse_perdechttpstr (re->u.q.path.ptr, re->u.q.path.ptr, &dec_count);
+	if (dec_count > 0) 
+	{
+		/* this assertion is to ensure that qse_isperencedhttpstr() 
+		 * returned true when dec_count is greater than 0 */
+		QSE_ASSERT (re->orgqpath.buf != QSE_NULL);
+		QSE_ASSERT (re->orgqpath.ptr != QSE_NULL);
+		re->flags |= QSE_HTRE_QPATH_PERDEC;
+	}
+
+	return 0;
+}

lib/http/http.c

@@ -0,0 +1,540 @@
+/*
+ * $Id$
+ * 
+    Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <qse/http/http.h>
+#include <qse/cmn/str.h>
+#include <qse/cmn/chr.h>
+#include <qse/cmn/htb.h>
+#include "../cmn/mem-prv.h"
+
+int qse_comparehttpversions (
+	const qse_http_version_t* v1,
+	const qse_http_version_t* v2)
+{
+	if (v1->major == v2->major) return v1->minor - v2->minor;
+	return v1->major - v2->major;
+}
+
+const qse_mchar_t* qse_httpstatustombs (int code)
+{
+	const qse_mchar_t* msg;
+
+	switch (code)
+	{
+		case 100: msg = QSE_MT("Continue"); break;
+		case 101: msg = QSE_MT("Switching Protocols"); break;
+
+		case 200: msg = QSE_MT("OK"); break;
+		case 201: msg = QSE_MT("Created"); break;
+		case 202: msg = QSE_MT("Accepted"); break;
+		case 203: msg = QSE_MT("Non-Authoritative Information"); break;
+		case 204: msg = QSE_MT("No Content"); break;
+		case 205: msg = QSE_MT("Reset Content"); break;
+		case 206: msg = QSE_MT("Partial Content"); break;
+		
+		case 300: msg = QSE_MT("Multiple Choices"); break;
+		case 301: msg = QSE_MT("Moved Permanently"); break;
+		case 302: msg = QSE_MT("Found"); break;
+		case 303: msg = QSE_MT("See Other"); break;
+		case 304: msg = QSE_MT("Not Modified"); break;
+		case 305: msg = QSE_MT("Use Proxy"); break;
+		case 307: msg = QSE_MT("Temporary Redirect"); break;
+		case 308: msg = QSE_MT("Permanent Redirect"); break;
+
+		case 400: msg = QSE_MT("Bad Request"); break;
+		case 401: msg = QSE_MT("Unauthorized"); break;
+		case 402: msg = QSE_MT("Payment Required"); break;
+		case 403: msg = QSE_MT("Forbidden"); break;
+		case 404: msg = QSE_MT("Not Found"); break;
+		case 405: msg = QSE_MT("Method Not Allowed"); break;
+		case 406: msg = QSE_MT("Not Acceptable"); break;
+		case 407: msg = QSE_MT("Proxy Authentication Required"); break;
+		case 408: msg = QSE_MT("Request Timeout"); break;
+		case 409: msg = QSE_MT("Conflict"); break;
+		case 410: msg = QSE_MT("Gone"); break;
+		case 411: msg = QSE_MT("Length Required"); break;
+		case 412: msg = QSE_MT("Precondition Failed"); break;
+		case 413: msg = QSE_MT("Request Entity Too Large"); break;
+		case 414: msg = QSE_MT("Request-URI Too Long"); break;
+		case 415: msg = QSE_MT("Unsupported Media Type"); break;
+		case 416: msg = QSE_MT("Requested Range Not Satisfiable"); break;
+		case 417: msg = QSE_MT("Expectation Failed"); break;
+		case 426: msg = QSE_MT("Upgrade Required"); break;
+		case 428: msg = QSE_MT("Precondition Required"); break;
+		case 429: msg = QSE_MT("Too Many Requests"); break;
+		case 431: msg = QSE_MT("Request Header Fields Too Large"); break;
+
+		case 500: msg = QSE_MT("Internal Server Error"); break;
+		case 501: msg = QSE_MT("Not Implemented"); break;
+		case 502: msg = QSE_MT("Bad Gateway"); break;
+		case 503: msg = QSE_MT("Service Unavailable"); break;
+		case 504: msg = QSE_MT("Gateway Timeout"); break;
+		case 505: msg = QSE_MT("HTTP Version Not Supported"); break;
+
+		default: msg = QSE_MT("Unknown Error"); break;
+	}
+
+	return msg;
+}
+
+const qse_mchar_t* qse_httpmethodtombs (qse_http_method_t type)
+{
+	/* keep this table in the same order as qse_httpd_method_t enumerators */
+	static qse_mchar_t* names[]  =
+	{
+		QSE_MT("OTHER"),
+
+		QSE_MT("HEAD"),
+		QSE_MT("GET"),
+		QSE_MT("POST"),
+		QSE_MT("PUT"),
+		QSE_MT("DELETE"),
+		QSE_MT("OPTIONS"),
+		QSE_MT("TRACE"),
+		QSE_MT("CONNECT")
+	}; 
+
+	return (type < 0 || type >= QSE_COUNTOF(names))? QSE_NULL: names[type];
+}
+
+struct mtab_t
+{
+	const qse_mchar_t* name;
+	qse_http_method_t type;
+};
+
+static struct mtab_t mtab[] =
+{
+	/* keep this table sorted by name for binary search */
+	{ QSE_MT("CONNECT"), QSE_HTTP_CONNECT },
+	{ QSE_MT("DELETE"),  QSE_HTTP_DELETE },
+	{ QSE_MT("GET"),     QSE_HTTP_GET },
+	{ QSE_MT("HEAD"),    QSE_HTTP_HEAD },
+	{ QSE_MT("OPTIONS"), QSE_HTTP_OPTIONS },
+	{ QSE_MT("POST"),    QSE_HTTP_POST },
+	{ QSE_MT("PUT"),     QSE_HTTP_PUT },
+	{ QSE_MT("TRACE"),   QSE_HTTP_TRACE }
+};
+
+qse_http_method_t qse_mbstohttpmethod (const qse_mchar_t* name)
+{
+	/* perform binary search */
+
+	/* declaring left, right, mid to be of int is ok
+	 * because we know mtab is small enough. */
+	int left = 0, right = QSE_COUNTOF(mtab) - 1, mid;
+
+	while (left <= right)
+	{
+		int n;
+		struct mtab_t* entry;
+
+		/*mid = (left + right) / 2;*/
+		mid = left + (right - left) / 2;
+		entry = &mtab[mid];
+
+		n = qse_mbscmp (name, entry->name);
+		if (n < 0) 
+		{
+			/* if left, right, mid were of qse_size_t,
+			 * you would need the following line. 
+			if (mid == 0) break;
+			 */
+			right = mid - 1;
+		}
+		else if (n > 0) left = mid + 1;
+		else return entry->type;
+	}
+
+	return QSE_HTTP_OTHER;
+}
+
+qse_http_method_t qse_mcstrtohttpmethod (const qse_mcstr_t* name)
+{
+	/* perform binary search */
+
+	/* declaring left, right, mid to be of int is ok
+	 * because we know mtab is small enough. */
+	int left = 0, right = QSE_COUNTOF(mtab) - 1, mid;
+
+	while (left <= right)
+	{
+		int n;
+		struct mtab_t* entry;
+
+		/*mid = (left + right) / 2;*/
+		mid = left + (right - left) / 2;
+		entry = &mtab[mid];
+
+		n = qse_mbsxcmp (name->ptr, name->len, entry->name);
+		if (n < 0) 
+		{
+			/* if left, right, mid were of qse_size_t,
+			 * you would need the following line. 
+			if (mid == 0) break;
+			 */
+			right = mid - 1;
+		}
+		else if (n > 0) left = mid + 1;
+		else return entry->type;
+	}
+
+	return QSE_HTTP_OTHER;
+}
+
+int qse_parsehttprange (const qse_mchar_t* str, qse_http_range_t* range)
+{
+	/* NOTE: this function does not support a range set 
+	 *       like bytes=1-20,30-50 */
+
+	qse_http_range_int_t from, to;
+	int type = QSE_HTTP_RANGE_PROPER;
+
+	if (str[0] != QSE_MT('b') ||
+	    str[1] != QSE_MT('y') ||
+	    str[2] != QSE_MT('t') ||
+	    str[3] != QSE_MT('e') ||
+	    str[4] != QSE_MT('s') ||
+	    str[5] != QSE_MT('=')) return -1;
+	
+	str += 6;
+
+	from = 0;
+	if (QSE_ISMDIGIT(*str))
+	{
+		do
+		{
+			from = from * 10 + (*str - QSE_MT('0'));
+			str++;
+		}
+		while (QSE_ISMDIGIT(*str));
+	}
+	else type = QSE_HTTP_RANGE_SUFFIX;
+
+	if (*str != QSE_MT('-')) return -1;
+	str++;
+
+	if (QSE_ISMDIGIT(*str))
+	{
+		to = 0;
+		do
+		{
+			to = to * 10 + (*str - QSE_MT('0'));
+			str++;
+		}
+		while (QSE_ISMDIGIT(*str));
+	}
+	else to = QSE_TYPE_MAX(qse_http_range_int_t); 
+
+	if (from > to) return -1;
+
+	range->type = type;
+	range->from = from;
+	range->to = to;
+	return 0;
+}
+
+typedef struct mname_t mname_t;
+struct mname_t
+{
+	const qse_mchar_t* s;
+	const qse_mchar_t* l;
+};
+	
+static mname_t wday_name[] =
+{
+	{ QSE_MT("Sun"), QSE_MT("Sunday") },
+	{ QSE_MT("Mon"), QSE_MT("Monday") },
+	{ QSE_MT("Tue"), QSE_MT("Tuesday") },
+	{ QSE_MT("Wed"), QSE_MT("Wednesday") },
+	{ QSE_MT("Thu"), QSE_MT("Thursday") },
+	{ QSE_MT("Fri"), QSE_MT("Friday") },
+	{ QSE_MT("Sat"), QSE_MT("Saturday") }
+};
+
+static mname_t mon_name[] =
+{
+	{ QSE_MT("Jan"), QSE_MT("January") },
+	{ QSE_MT("Feb"), QSE_MT("February") },
+	{ QSE_MT("Mar"), QSE_MT("March") },
+	{ QSE_MT("Apr"), QSE_MT("April") },
+	{ QSE_MT("May"), QSE_MT("May") },
+	{ QSE_MT("Jun"), QSE_MT("June") },
+	{ QSE_MT("Jul"), QSE_MT("July") },
+	{ QSE_MT("Aug"), QSE_MT("August") },
+	{ QSE_MT("Sep"), QSE_MT("September") },
+	{ QSE_MT("Oct"), QSE_MT("October") },
+	{ QSE_MT("Nov"), QSE_MT("November") },
+	{ QSE_MT("Dec"), QSE_MT("December") }
+};
+
+int qse_parsehttptime (const qse_mchar_t* str, qse_ntime_t* nt)
+{
+	qse_btime_t bt;
+	const qse_mchar_t* word;
+	qse_size_t wlen, i;
+
+	/* TODO: support more formats */
+
+	QSE_MEMSET (&bt, 0, QSE_SIZEOF(bt));
+
+	/* weekday */
+	while (QSE_ISMSPACE(*str)) str++;
+	for (word = str; QSE_ISMALPHA(*str); str++);
+	wlen = str - word;
+	for (i = 0; i < QSE_COUNTOF(wday_name); i++)
+	{
+		if (qse_mbsxcmp (word, wlen, wday_name[i].s) == 0)
+		{
+			bt.wday = i;
+			break;
+		}
+	}
+	if (i >= QSE_COUNTOF(wday_name)) return -1;
+
+	/* comma - i'm just loose as i don't care if it doesn't exist */
+	while (QSE_ISMSPACE(*str)) str++;
+	if (*str == QSE_MT(',')) str++;
+
+	/* day */
+	while (QSE_ISMSPACE(*str)) str++;
+	if (!QSE_ISMDIGIT(*str)) return -1;
+	do bt.mday = bt.mday * 10 + *str++ - QSE_MT('0'); while (QSE_ISMDIGIT(*str));
+
+	/* month */
+	while (QSE_ISMSPACE(*str)) str++;
+	for (word = str; QSE_ISMALPHA(*str); str++);
+	wlen = str - word;
+	for (i = 0; i < QSE_COUNTOF(mon_name); i++)
+	{
+		if (qse_mbsxcmp (word, wlen, mon_name[i].s) == 0)
+		{
+			bt.mon = i;
+			break;
+		}
+	}
+	if (i >= QSE_COUNTOF(mon_name)) return -1;
+
+	/* year */
+	while (QSE_ISMSPACE(*str)) str++;
+	if (!QSE_ISMDIGIT(*str)) return -1;
+	do bt.year = bt.year * 10 + *str++ - QSE_MT('0'); while (QSE_ISMDIGIT(*str));
+	bt.year -= QSE_BTIME_YEAR_BASE;
+
+	/* hour */
+	while (QSE_ISMSPACE(*str)) str++;
+	if (!QSE_ISMDIGIT(*str)) return -1;
+	do bt.hour = bt.hour * 10 + *str++ - QSE_MT('0'); while (QSE_ISMDIGIT(*str));
+	if (*str != QSE_MT(':'))  return -1;
+	str++;
+
+	/* min */
+	while (QSE_ISMSPACE(*str)) str++;
+	if (!QSE_ISMDIGIT(*str)) return -1;
+	do bt.min = bt.min * 10 + *str++ - QSE_MT('0'); while (QSE_ISMDIGIT(*str));
+	if (*str != QSE_MT(':'))  return -1;
+	str++;
+
+	/* sec */
+	while (QSE_ISMSPACE(*str)) str++;
+	if (!QSE_ISMDIGIT(*str)) return -1;
+	do bt.sec = bt.sec * 10 + *str++ - QSE_MT('0'); while (QSE_ISMDIGIT(*str));
+
+	/* GMT */
+	while (QSE_ISMSPACE(*str)) str++;
+	for (word = str; QSE_ISMALPHA(*str); str++);
+	wlen = str - word;
+	if (qse_mbsxcmp (word, wlen, QSE_MT("GMT")) != 0) return -1;
+
+	while (QSE_ISMSPACE(*str)) str++;
+	if (*str != QSE_MT('\0')) return -1;
+
+	return qse_timegm (&bt, nt);
+}
+
+qse_mchar_t* qse_fmthttptime (
+	const qse_ntime_t* nt, qse_mchar_t* buf, qse_size_t bufsz)
+{
+	qse_btime_t bt;
+
+	qse_gmtime (nt, &bt);
+
+	qse_mbsxfmt (
+		buf, bufsz,
+		QSE_MT("%s, %d %s %d %02d:%02d:%02d GMT"),
+		wday_name[bt.wday].s,
+		bt.mday,
+		mon_name[bt.mon].s,
+		bt.year + QSE_BTIME_YEAR_BASE,
+		bt.hour, bt.min, bt.sec
+	);
+
+	return buf;
+}
+
+int qse_isperencedhttpstr (const qse_mchar_t* str)
+{
+	const qse_mchar_t* p = str;
+
+	while (*p != QSE_MT('\0'))
+	{
+		if (*p == QSE_MT('%') && *(p + 1) != QSE_MT('\0') && *(p + 2) != QSE_MT('\0'))
+		{
+			int q = QSE_MXDIGITTONUM (*(p + 1));
+			if (q >= 0)
+			{
+				/* return true if the first valid percent-encoded sequence is found */
+				int w = QSE_MXDIGITTONUM (*(p + 2));
+				if (w >= 0) return 1; 
+			}
+		}
+
+		p++;
+	}
+
+	return 1;
+}
+
+qse_size_t qse_perdechttpstr (const qse_mchar_t* str, qse_mchar_t* buf, qse_size_t* ndecs)
+{
+	const qse_mchar_t* p = str;
+	qse_mchar_t* out = buf;
+	qse_size_t dec_count = 0;
+
+	while (*p != QSE_MT('\0'))
+	{
+		if (*p == QSE_MT('%') && *(p + 1) != QSE_MT('\0') && *(p + 2) != QSE_MT('\0'))
+		{
+			int q = QSE_MXDIGITTONUM (*(p + 1));
+			if (q >= 0)
+			{
+				int w = QSE_MXDIGITTONUM (*(p + 2));
+				if (w >= 0)
+				{
+					/* we don't care if it contains a null character */
+					*out++ = ((q << 4) + w);
+					p += 3;
+					dec_count++;
+					continue;
+				}
+			}
+		}
+
+		*out++ = *p++;
+	}
+
+	*out = QSE_MT('\0');
+	if (ndecs) *ndecs = dec_count;
+	return out - buf;
+}
+
+#define IS_UNRESERVED(c) \
+	(((c) >= QSE_MT('A') && (c) <= QSE_MT('Z')) || \
+	 ((c) >= QSE_MT('a') && (c) <= QSE_MT('z')) || \
+	 ((c) >= QSE_MT('0') && (c) <= QSE_MT('9')) || \
+	 (c) == QSE_MT('-') || (c) == QSE_MT('_') || \
+	 (c) == QSE_MT('.') || (c) == QSE_MT('~'))
+
+#define TO_HEX(v) (QSE_MT("0123456789ABCDEF")[(v) & 15])
+
+qse_size_t qse_perenchttpstr (int opt, const qse_mchar_t* str, qse_mchar_t* buf, qse_size_t* nencs)
+{
+	const qse_mchar_t* p = str;
+	qse_mchar_t* out = buf;
+	qse_size_t enc_count = 0;
+
+	/* this function doesn't accept the size of the buffer. the caller must 
+	 * ensure that the buffer is large enough */
+
+	if (opt & QSE_PERENCHTTPSTR_KEEP_SLASH)
+	{
+		while (*p != QSE_MT('\0'))
+		{
+			if (IS_UNRESERVED(*p) || *p == QSE_MT('/')) *out++ = *p;
+			else
+			{
+				*out++ = QSE_MT('%');
+				*out++ = TO_HEX (*p >> 4);
+				*out++ = TO_HEX (*p & 15);
+				enc_count++;
+			}
+			p++;
+		}
+	}
+	else
+	{
+		while (*p != QSE_MT('\0'))
+		{
+			if (IS_UNRESERVED(*p)) *out++ = *p;
+			else
+			{
+				*out++ = QSE_MT('%');
+				*out++ = TO_HEX (*p >> 4);
+				*out++ = TO_HEX (*p & 15);
+				enc_count++;
+			}
+			p++;
+		}
+	}
+	*out = QSE_MT('\0');
+	if (nencs) *nencs = enc_count;
+	return out - buf;
+}
+
+qse_mchar_t* qse_perenchttpstrdup (int opt, const qse_mchar_t* str, qse_mmgr_t* mmgr)
+{
+	qse_mchar_t* buf;
+	qse_size_t len = 0;
+	qse_size_t count = 0;
+	
+	/* count the number of characters that should be encoded */
+	if (opt & QSE_PERENCHTTPSTR_KEEP_SLASH)
+	{
+		for (len = 0; str[len] != QSE_MT('\0'); len++)
+		{
+			if (!IS_UNRESERVED(str[len]) && str[len] != QSE_MT('/')) count++;
+		}
+	}
+	else
+	{
+		for (len = 0; str[len] != QSE_MT('\0'); len++)
+		{
+			if (!IS_UNRESERVED(str[len])) count++;
+		}
+	}
+
+	/* if there are no characters to escape, just return the original string */
+	if (count <= 0) return (qse_mchar_t*)str;
+
+	/* allocate a buffer of an optimal size for escaping, otherwise */
+	buf = QSE_MMGR_ALLOC (mmgr, (len  + (count * 2) + 1)  * QSE_SIZEOF(*buf));
+	if (buf == QSE_NULL) return QSE_NULL;
+
+	/* perform actual escaping */
+	qse_perenchttpstr (opt, str, buf, QSE_NULL);
+
+	return buf;
+}

lib/http/httpd-dir.c

@@ -0,0 +1,689 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "httpd.h"
+#include "../cmn/mem-prv.h"
+#include <qse/cmn/str.h>
+#include <qse/cmn/fmt.h>
+
+typedef struct task_dir_t task_dir_t;
+struct task_dir_t
+{
+	qse_mcstr_t        path;
+	qse_mcstr_t        qpath;
+	qse_mcstr_t        head;
+	qse_mcstr_t        foot;
+	qse_http_version_t version;
+	int                keepalive;
+	int                method;
+	qse_httpd_hnd_t    handle;
+};
+
+typedef struct task_dseg_t task_dseg_t;
+struct task_dseg_t
+{
+	qse_http_version_t version;
+	int                keepalive;
+	int                chunked;
+
+	qse_mcstr_t path;
+	qse_mcstr_t qpath;
+	qse_mcstr_t head;
+	qse_mcstr_t foot;
+	qse_httpd_hnd_t handle;
+	qse_httpd_dirent_t dent;
+
+#define HEADER_ADDED   (1 << 0)
+#define FOOTER_ADDED   (1 << 1)
+#define FOOTER_PENDING (1 << 2)
+#define DIRENT_PENDING (1 << 3)
+#define DIRENT_NOMORE  (1 << 4)
+	int state;
+
+	qse_size_t  tcount; /* total directory entries */
+	qse_size_t  dcount; /* the number of items in the buffer */
+
+	qse_mchar_t buf[4096*2]; /* is this large enough? */
+	int         bufpos; 
+	int         buflen;
+	int         bufrem;
+	qse_size_t  chunklen;
+};
+
+static int task_init_dseg (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_dseg_t* xtn = qse_httpd_gettaskxtn (httpd, task);
+	task_dseg_t* arg = (task_dseg_t*)task->ctx;
+
+	QSE_MEMCPY (xtn, arg, QSE_SIZEOF(*xtn));
+
+	xtn->path.ptr = (qse_mchar_t*)(xtn + 1);
+	qse_mbscpy ((qse_mchar_t*)xtn->path.ptr, arg->path.ptr);
+	xtn->qpath.ptr = xtn->path.ptr + xtn->path.len + 1;
+	qse_mbscpy ((qse_mchar_t*)xtn->qpath.ptr, arg->qpath.ptr);
+
+	xtn->head.ptr = xtn->qpath.ptr + xtn->qpath.len + 1;
+	qse_mbscpy ((qse_mchar_t*)xtn->head.ptr, arg->head.ptr);
+	xtn->foot.ptr = xtn->head.ptr + xtn->head.len + 1;
+	qse_mbscpy ((qse_mchar_t*)xtn->foot.ptr, arg->foot.ptr);
+
+	task->ctx = xtn;
+
+	return 0;
+}
+
+static void task_fini_dseg (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_dseg_t* ctx = (task_dseg_t*)task->ctx;
+	httpd->opt.scb.dir.close (httpd, ctx->handle);
+}
+
+#define SIZE_CHLEN     4 /* the space size to hold the hexadecimal chunk length */
+#define SIZE_CHLENCRLF 2 /* the space size to hold CRLF after the chunk length */
+#define SIZE_CHENDCRLF 2 /* the sapce size to hold CRLF after the chunk data */
+
+static QSE_INLINE void close_chunk_data (task_dseg_t* ctx, qse_size_t len)
+{
+	ctx->chunklen = len;
+
+	/* CHENDCRLF - there is always space for these two. 
+	 * reserved with SIZE_CHENDCRLF */
+	ctx->buf[ctx->buflen++] = QSE_MT('\r');
+	ctx->buf[ctx->buflen++] = QSE_MT('\n');
+}
+
+static void fill_chunk_length (task_dseg_t* ctx)
+{
+	int x;
+
+	/* right alignment with space padding on the left */
+	x = qse_fmtuintmaxtombs (
+		ctx->buf, (SIZE_CHLEN + SIZE_CHLENCRLF) - 1, 
+		(ctx->chunklen - (SIZE_CHLEN + SIZE_CHLENCRLF)), /* value to convert */
+		16 | QSE_FMTUINTMAXTOMBS_UPPERCASE, /* uppercase hexadecimal letters */
+		-1, /* no particular precision - want space filled if less than 4 digits */
+		QSE_MT(' '),  /* fill with space */
+		QSE_NULL
+	);
+	/* i don't check the buffer size error because i've secured the 
+	 * suffient space for the chunk length at the beginning of the buffer */
+	
+	/* CHLENCRLF */
+	ctx->buf[x] = QSE_MT('\r');
+	ctx->buf[x+1] = QSE_MT('\n');
+
+	/* skip leading space padding */
+	QSE_ASSERT (ctx->bufpos == 0);
+	while (ctx->buf[ctx->bufpos] == QSE_MT(' ')) ctx->bufpos++;
+}
+
+static qse_size_t format_dirent (
+	qse_httpd_t* httpd, 
+	qse_httpd_client_t* client, 
+	const qse_httpd_dirent_t* dirent,
+	qse_mchar_t* buf, int bufsz)
+{
+	qse_size_t x;
+
+	qse_mchar_t* encname;
+	qse_mchar_t* escname;
+	qse_btime_t bt;
+	qse_mchar_t tmbuf[32];
+	qse_mchar_t fszbuf[64];
+
+	/* TODO: better buffer management in case there are 
+	 *       a lot of file names to escape. */
+
+	/* perform percent-encoding for the anchor */
+	encname = qse_perenchttpstrdup (0, dirent->name, qse_httpd_getmmgr(httpd));
+	if (encname == QSE_NULL)
+	{
+		httpd->errnum = QSE_HTTPD_ENOMEM;
+		return -1;
+	}
+
+	/* perform html escaping for the text */
+	escname = qse_httpd_escapehtml (httpd, dirent->name);
+	if (escname == QSE_NULL) 
+	{
+		if (encname != dirent->name) QSE_MMGR_FREE (qse_httpd_getmmgr(httpd), encname);
+		return -1;
+	}
+
+	qse_localtime (&dirent->stat.mtime, &bt);
+	qse_mbsxfmt (tmbuf, QSE_COUNTOF(tmbuf),
+		QSE_MT("%04d-%02d-%02d %02d:%02d:%02d"),
+		bt.year + QSE_BTIME_YEAR_BASE, bt.mon + 1, bt.mday,
+		bt.hour, bt.min, bt.sec);
+
+	if (dirent->stat.isdir)
+	{
+		fszbuf[0] = QSE_MT('\0');
+	}
+	else
+	{
+		qse_fmtuintmaxtombs (
+			fszbuf, QSE_COUNTOF(fszbuf),
+			dirent->stat.size, 10, -1, QSE_MT('\0'), QSE_NULL
+		);
+	}
+
+	x = qse_mbsxfmts (
+		buf, bufsz,
+		QSE_MT("<tr><td class='name'><a href='%s%s' class='%s'>%s%s</a></td><td class='time'>%s</td><td class='size'>%s</td></tr>\n"),
+		encname,
+		(dirent->stat.isdir? QSE_MT("/"): QSE_MT("")),
+		(dirent->stat.isdir? QSE_MT("dir"): QSE_MT("file")),
+		escname,
+		(dirent->stat.isdir? QSE_MT("/"): QSE_MT("")),
+		tmbuf, fszbuf
+	);
+
+	if (escname != dirent->name) qse_httpd_freemem (httpd, escname);
+	if (encname != dirent->name) QSE_MMGR_FREE (qse_httpd_getmmgr(httpd), encname);
+
+	if (x == (qse_size_t)-1) httpd->errnum = QSE_HTTPD_ENOBUF;
+	return x;
+}
+
+static int add_footer (qse_httpd_t* httpd, qse_httpd_client_t* client, task_dseg_t* ctx)
+{
+	qse_size_t x;
+	int rem;
+
+	rem = ctx->chunked? (ctx->bufrem - 5): ctx->bufrem;
+	if (rem < 1)
+	{
+		httpd->errnum = QSE_HTTPD_ENOBUF;
+		return -1;
+	}
+
+	x = qse_mbsxfmts (&ctx->buf[ctx->buflen], rem, QSE_MT("</table></div>\n<div class='footer'>%s</div>\n</body></html>"), ctx->foot.ptr);
+	if (x == (qse_size_t)-1) 
+	{
+		httpd->errnum = QSE_HTTPD_ENOBUF;
+		return -1;
+	}
+
+	QSE_ASSERT (x < rem);
+
+	ctx->buflen += x;
+	ctx->bufrem -= x;
+
+	if (ctx->chunked)
+	{
+		qse_mbscpy (&ctx->buf[ctx->buflen], QSE_MT("\r\n0\r\n"));
+		ctx->buflen += 5;
+		ctx->bufrem -= 5;
+
+		/* -5 for \r\n0\r\n added above */
+		if (ctx->chunked) close_chunk_data (ctx, ctx->buflen - 5);
+	}
+
+	return 0;
+}
+
+static int task_main_dseg (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_dseg_t* ctx = (task_dseg_t*)task->ctx;
+	qse_ssize_t n;
+	qse_size_t x;
+
+	if (ctx->bufpos < ctx->buflen) 
+	{
+		/* buffer contents not fully sent yet */
+		goto send_dirlist;
+	}
+
+	/* the buffer size is fixed to QSE_COUNTOF(ctx->buf).
+	 * 
+	 * the number of digits need to hold the the size converted to
+	 * a hexadecimal notation is roughly (log16(QSE_COUNTOF(ctx->buf) + 1).
+	 * it should be safter to use ceil(log16(QSE_COUNTOF(ctx->buf)) + 1
+	 * for precision issues. 
+	 *
+	 *  16**X = QSE_COUNTOF(ctx->buf). 
+	 *  X = log16(QSE_COUNTOF(ctx->buf).
+	 *  X + 1 is a required number of digits.
+	 *
+	 * Since log16 is not provided, we should use a natural log function
+	 * whose base is the constant e (2.718).
+	 * 
+	 *  log16(n) = log(n) / log(16)
+	 *
+	 * The final fomula is here.
+	 *
+	 *  X = ceil((log(QSE_COUNTOF(ctx->buf)) / log(16))) + 1;
+	 *  
+ 	 * However, i won't use these floating-point opertions.
+	 * instead i'll reserve a hardcoded size. so when you change
+	 * the size of the buffer arrray, you should check this size. 
+	 */
+	
+	/* initialize buffer */
+	ctx->dcount = 0; /* reset the entry counter */
+	ctx->bufpos = 0;
+	if (ctx->chunked)
+	{
+		/* reserve space to fill with the chunk length
+		 * 4 for the actual chunk length and +2 for \r\n */
+		ctx->buflen = SIZE_CHLEN + SIZE_CHLENCRLF; 
+		/* free space remaing in the buffer for the chunk data */
+		ctx->bufrem = QSE_COUNTOF(ctx->buf) - ctx->buflen - SIZE_CHENDCRLF; 
+	}
+	else
+	{
+		ctx->buflen = 0;
+		ctx->bufrem = QSE_COUNTOF(ctx->buf);
+	}
+
+	if (ctx->state & FOOTER_PENDING)
+	{
+		/* only footers yet to be sent */
+		if (add_footer (httpd, client, ctx) <= -1)
+		{
+			/* return an error if the buffer is too small to hold the 
+			 * trailing footer. you need to increase the buffer size */
+			return -1;
+		}
+
+		ctx->state &= ~FOOTER_PENDING;
+		ctx->state |= FOOTER_ADDED;
+
+		if (ctx->chunked) fill_chunk_length (ctx);
+		goto send_dirlist;
+	}
+
+	if (!(ctx->state & HEADER_ADDED))
+	{
+		/* compose the header since this is the first time. */
+		int is_root;
+		qse_mchar_t* qpath_esc;
+
+		is_root = (qse_mbscmp (ctx->qpath.ptr, QSE_MT("/")) == 0);
+
+		qpath_esc = qse_httpd_escapehtml (httpd, ctx->qpath.ptr);
+		if (qpath_esc == QSE_NULL) return -1;
+
+		/* TODO: page encoding?? utf-8??? or derive name from cmgr or current locale??? */
+		/* TODO: SUPPORT character set. DON't HARD_CODE it to UTF8 */
+		x = qse_mbsxfmts (&ctx->buf[ctx->buflen], ctx->bufrem,
+			QSE_MT("<html><meta http-equiv=\"Content-Type\" content=\"text/html; charset='UTF-8'\">\n<head>%s</head>\n<body>\n<div class='header'>%s</div>\n<div class='body'><table>%s"), 
+			ctx->head.ptr, qpath_esc,
+			(is_root? QSE_MT(""): QSE_MT("<tr><td class='name'><a href='../' class='dir'>..</a></td><td class='time'></td><td class='size'></td></tr>\n"))
+		);
+
+		if (qpath_esc != ctx->qpath.ptr) qse_httpd_freemem (httpd, qpath_esc);
+
+		if (x == (qse_size_t)-1)
+		{
+			/* return an error if the buffer is too small to 
+			 * hold the header(httpd->errnum == QSE_HTTPD_ENOBUF).
+			 * i need to increase the buffer size. or i have make
+			 * the buffer dynamic. */
+			httpd->errnum = QSE_HTTPD_ENOBUF;
+			return -1;
+		}
+
+		QSE_ASSERT (x < ctx->bufrem);
+
+		ctx->buflen += x;
+		ctx->bufrem -= x;
+
+		ctx->state |= HEADER_ADDED;
+		ctx->dcount++;  
+	}
+
+	if (ctx->state & DIRENT_PENDING) 
+	{
+		ctx->state &= ~DIRENT_PENDING;
+	}
+	else 
+	{
+		if (httpd->opt.scb.dir.read (httpd, ctx->handle, &ctx->dent) <= 0)
+			ctx->state |= DIRENT_NOMORE;
+	}
+
+	do
+	{
+		if (ctx->state & DIRENT_NOMORE)
+		{
+			/* no more directory entry */
+
+			if (add_footer (httpd, client, ctx) <= -1) 
+			{
+				/* failed to add the footer part */
+				if (ctx->chunked)
+				{
+					close_chunk_data (ctx, ctx->buflen);
+					fill_chunk_length (ctx);
+				}
+				ctx->state |= FOOTER_PENDING;
+			}
+			else if (ctx->chunked) fill_chunk_length (ctx);
+			break;
+		}
+
+		if (qse_mbscmp (ctx->dent.name, QSE_MT(".")) != 0 &&
+		    qse_mbscmp (ctx->dent.name, QSE_MT("..")) != 0)
+		{
+			x = format_dirent (httpd, client, &ctx->dent, &ctx->buf[ctx->buflen], ctx->bufrem); 
+			if (x == (qse_size_t)-1)
+			{
+				/* buffer not large enough to hold this entry */
+				if (ctx->dcount <= 0) 
+				{
+					/* neither directory entry nor the header 
+					 * has been added to the buffer so far. and 
+					 * this attempt has failed. the buffer size must 
+					 * be too small. you must increase it */
+					httpd->errnum = QSE_HTTPD_EINTERN;
+					return -1;
+				}
+
+				if (ctx->chunked)
+				{
+					close_chunk_data (ctx, ctx->buflen);
+					fill_chunk_length (ctx);
+				}
+
+				ctx->state |= DIRENT_PENDING;
+				break;
+			}
+			else
+			{
+				QSE_ASSERT (x < ctx->bufrem);
+
+				ctx->buflen += x;
+				ctx->bufrem -= x;
+				ctx->dcount++;
+				ctx->tcount++;
+			}
+		}
+
+		if (httpd->opt.scb.dir.read (httpd, ctx->handle, &ctx->dent) <= 0)
+			ctx->state |= DIRENT_NOMORE;
+	}
+	while (1);
+
+
+send_dirlist:
+	httpd->errnum = QSE_HTTPD_ENOERR;
+	n = httpd->opt.scb.client.send (
+		httpd, client, &ctx->buf[ctx->bufpos], ctx->buflen - ctx->bufpos);
+	if (n <= -1) return -1;
+
+	/* NOTE if (n == 0), it will enter an infinite loop */
+
+	ctx->bufpos += n;
+	return (ctx->bufpos < ctx->buflen || (ctx->state & FOOTER_PENDING) || !(ctx->state & DIRENT_NOMORE))? 1: 0;
+}
+
+static qse_httpd_task_t* entask_directory_segment (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred, qse_httpd_hnd_t handle, task_dir_t* dir)
+{
+	qse_httpd_task_t task;
+	task_dseg_t data;
+	
+	QSE_MEMSET (&data, 0, QSE_SIZEOF(data));
+	data.handle = handle;
+	data.version = dir->version;
+	data.keepalive = dir->keepalive;
+	data.chunked = dir->keepalive;
+	data.path = dir->path;
+	data.qpath = dir->qpath;
+	data.head = dir->head;
+	data.foot = dir->foot;
+
+	QSE_MEMSET (&task, 0, QSE_SIZEOF(task));
+	task.init = task_init_dseg;
+	task.main = task_main_dseg;
+	task.fini = task_fini_dseg;
+	task.ctx = &data;
+
+	return qse_httpd_entask (httpd, client, pred, &task, QSE_SIZEOF(data) + data.path.len + 1 + data.qpath.len + 1 + data.head.len + 1 + data.foot.len + 1);
+}
+
+/*------------------------------------------------------------------------*/
+
+static int task_init_getdir (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_dir_t* xtn = qse_httpd_gettaskxtn (httpd, task);
+	task_dir_t* arg = (task_dir_t*)task->ctx;
+
+	/* deep-copy the context data to the extension area */
+	QSE_MEMCPY (xtn, arg, QSE_SIZEOF(*xtn));
+
+	xtn->path.ptr = (qse_mchar_t*)(xtn + 1);
+	qse_mbscpy ((qse_mchar_t*)xtn->path.ptr, arg->path.ptr);
+	xtn->qpath.ptr = xtn->path.ptr + xtn->path.len + 1;
+	qse_mbscpy ((qse_mchar_t*)xtn->qpath.ptr, arg->qpath.ptr);
+
+	xtn->head.ptr = xtn->qpath.ptr + xtn->qpath.len + 1;
+	qse_mbscpy ((qse_mchar_t*)xtn->head.ptr, arg->head.ptr);
+	xtn->foot.ptr = xtn->head.ptr + xtn->head.len + 1;
+	qse_mbscpy ((qse_mchar_t*)xtn->foot.ptr, arg->foot.ptr);
+
+	/* switch the context to the extension area */
+	task->ctx = xtn;
+	return 0;
+}
+
+static QSE_INLINE int task_main_getdir (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_dir_t* dir;
+	qse_httpd_task_t* x;
+
+	dir = (task_dir_t*)task->ctx;
+	x = task;
+
+	/* arrange to return the header part first */
+	if (dir->method == QSE_HTTP_HEAD)
+	{
+		x = qse_httpd_entaskformat (
+			httpd, client, x,
+    			QSE_MT("HTTP/%d.%d 200 OK\r\nServer: %s\r\nDate: %s\r\nConnection: %s\r\nContent-Type: text/html\r\nContent-Length: 0\r\n\r\n"), 
+			dir->version.major, dir->version.minor,
+			qse_httpd_getname (httpd),
+			qse_httpd_fmtgmtimetobb (httpd, QSE_NULL, 0),
+			(dir->keepalive? QSE_MT("keep-alive"): QSE_MT("close"))
+		);
+
+		httpd->opt.scb.dir.close (httpd, dir->handle);
+		return (x == QSE_NULL)? -1: 0;
+	}
+	else
+	{
+		int keepalive_ignored = 0;
+
+		if (dir->keepalive && qse_comparehttpversions (&dir->version, &qse_http_v11) < 0) 
+		{
+			/* this task does chunking when keepalive is set.
+			 * chunking is not supported for http 1.0 or earlier.
+			 * force switch to the close mode */
+			dir->keepalive = 0;
+			keepalive_ignored = 1;
+		}
+
+		x = qse_httpd_entaskformat (
+			httpd, client, x,
+			QSE_MT("HTTP/%d.%d 200 OK\r\nServer: %s\r\nDate: %s\r\nConnection: %s\r\nContent-Type: text/html\r\n%s\r\n"), 
+			dir->version.major, dir->version.minor,
+			qse_httpd_getname (httpd),
+			qse_httpd_fmtgmtimetobb (httpd, QSE_NULL, 0),
+			(dir->keepalive? QSE_MT("keep-alive"): QSE_MT("close")),
+			(dir->keepalive? QSE_MT("Transfer-Encoding: chunked\r\n"): QSE_MT(""))
+		);
+		if (x) 
+		{
+#if 0
+			if (httpd->opt.trait & QSE_HTTPD_LOGACC)
+			{
+				qse_httpd_reqsum_t reqsum;
+
+				acc.remote = remote;
+				acc.qpath = qpath;
+				acc.status = 200;
+				acc.version =  ...;
+				acc.method =  ...;
+
+				httpd->opt.rcb.logacc (httpd, &reqsum);
+			}
+#endif
+
+			/* arrange to send the actual directory contents */
+			x = entask_directory_segment (httpd, client, x, dir->handle, dir);
+			if (keepalive_ignored && x)
+				x = qse_httpd_entaskdisconnect (httpd, client, x);
+			if (x) return 0;
+			
+		}
+
+		httpd->opt.scb.dir.close (httpd, dir->handle);
+		return -1;
+	}
+}
+
+qse_httpd_task_t* qse_httpd_entaskdir (
+	qse_httpd_t* httpd,
+	qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred,
+	qse_httpd_rsrc_dir_t* dir,
+	qse_htre_t* req)
+{
+	int method;
+
+	method = qse_htre_getqmethodtype(req);
+
+	/* i don't need contents for directories */
+	qse_htre_discardcontent (req); 
+
+	switch (method)
+	{
+		case QSE_HTTP_OPTIONS:
+			return qse_httpd_entaskallow (httpd, client, pred, 
+				QSE_MT("OPTIONS,GET,HEAD,POST,PUT,DELETE"), req);
+
+		case QSE_HTTP_HEAD:
+		case QSE_HTTP_GET:
+		case QSE_HTTP_POST:
+		{
+			task_dir_t data;
+			QSE_MEMSET (&data, 0, QSE_SIZEOF(data));
+
+			/* check if the directory stream can be opened before
+			 * creating an actual task. */
+			if (httpd->opt.scb.dir.open (httpd, dir->path, &data.handle) <= -1)
+			{
+				/* arrange a status code to return */
+				int status;
+				status = (httpd->errnum == QSE_HTTPD_ENOENT)? 404:
+					    (httpd->errnum == QSE_HTTPD_EACCES)? 403: 500;
+				return qse_httpd_entaskerror (httpd, client, pred, status, req);
+			}
+			else
+			{
+				/* create a directory listing task */
+				qse_httpd_task_t task, * x;
+
+				data.path.ptr = (qse_mchar_t*)dir->path;
+				data.path.len = qse_mbslen(data.path.ptr);
+				data.qpath.ptr = qse_htre_getqpath(req);
+				data.qpath.len = qse_mbslen(data.qpath.ptr);
+				data.head.ptr = dir->head? (qse_mchar_t*)dir->head: QSE_MT("<style type='text/css'>body { background-color:#d0e4fe; font-size: 0.9em; } div.header { font-weight: bold; margin-bottom: 5px; } div.footer { border-top: 1px solid #99AABB; text-align: right; } table { font-size: 0.9em; } td { white-space: nowrap; } td.size { text-align: right; }</style>");
+				data.head.len = qse_mbslen(data.head.ptr);
+				data.foot.ptr = dir->foot? dir->foot: qse_httpd_getname(httpd);
+				data.foot.len = qse_mbslen(data.foot.ptr);
+				data.version = *qse_htre_getversion(req);
+				data.keepalive = req->flags & QSE_HTRE_ATTR_KEEPALIVE;
+				data.method = method;
+
+				QSE_MEMSET (&task, 0, QSE_SIZEOF(task));
+				task.init = task_init_getdir;
+				task.main = task_main_getdir;
+				task.ctx = &data;
+
+				x = qse_httpd_entask (httpd, client, pred, &task,
+					QSE_SIZEOF(task_dir_t) + data.path.len + 1 + data.qpath.len + 1 + 
+					                         data.head.len + 1 + data.foot.len + 1);
+				if (x == QSE_NULL)
+				{
+					httpd->opt.scb.dir.close (httpd, data.handle);
+				}
+				return x;
+			}
+		}
+
+		case QSE_HTTP_PUT:
+		{
+			int status = 201; /* 201 Created */
+
+			if (httpd->opt.scb.dir.make (httpd, dir->path) <= -1)
+			{
+				if (httpd->errnum == QSE_HTTPD_EEXIST)
+				{
+					/* an entry with the same name exists.
+					 * if it is a directory, it's considered ok.
+					 * if not, send '403 forbidden' indicating you can't 
+					 * change a file to a directory */
+					qse_httpd_stat_t st;
+					status = (httpd->opt.scb.dir.stat (httpd, dir->path, &st) <= -1)? 403: 204;
+				}
+				else
+				{
+					status = (httpd->errnum == QSE_HTTPD_ENOENT)? 404:
+					         (httpd->errnum == QSE_HTTPD_EACCES)? 403: 500;
+				}
+			}
+
+			return qse_httpd_entaskerror (httpd, client, pred, status, req);
+		}
+
+
+		case QSE_HTTP_DELETE:
+		{
+			int status = 200;
+
+			if (httpd->opt.scb.dir.purge (httpd, dir->path) <= -1)
+			{
+				status = (httpd->errnum == QSE_HTTPD_ENOENT)? 404:
+				         (httpd->errnum == QSE_HTTPD_EACCES)? 403: 500;
+			}
+
+			return qse_httpd_entaskerror (httpd, client, pred, status, req);
+		}
+
+		default:
+			/* Method not allowed */
+			return qse_httpd_entaskerror (httpd, client, pred, 405, req);
+	}
+}

lib/http/httpd-file.c

@@ -0,0 +1,656 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "httpd.h"
+#include "../cmn/mem-prv.h"
+#include <qse/cmn/str.h>
+#include <qse/cmn/fmt.h>
+
+#define ETAG_LEN_MAX 127
+
+#define PUTFILE_INIT_FAILED  (1 << 0)
+#define PUTFILE_WRITE_FAILED (1 << 1)
+
+typedef struct task_file_t task_file_t;
+struct task_file_t
+{
+	qse_mcstr_t path;
+
+	qse_http_version_t version;
+	int                keepalive;
+	int                method;
+
+	union
+	{
+		struct
+		{
+			qse_mcstr_t mime;
+			qse_mchar_t if_none_match[ETAG_LEN_MAX + 1];
+			qse_ntime_t if_modified_since;
+			qse_http_range_t range;
+		} get;
+		struct
+		{
+			qse_httpd_t* httpd;
+			int flags;
+			int status;
+			qse_htre_t* req;
+			qse_httpd_hnd_t handle;
+		} put;
+	} u;
+};
+
+/*------------------------------------------------------------------------*/
+
+typedef struct task_getfseg_t task_getfseg_t;
+struct task_getfseg_t
+{
+	qse_httpd_hnd_t handle;
+	qse_foff_t left;
+	qse_foff_t offset;
+};
+
+static int task_init_getfseg (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_getfseg_t* xtn = qse_httpd_gettaskxtn (httpd, task);
+	QSE_MEMCPY (xtn, task->ctx, QSE_SIZEOF(*xtn));
+	task->ctx = xtn;
+	return 0;
+}
+
+static void task_fini_getfseg (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_getfseg_t* ctx = (task_getfseg_t*)task->ctx;
+	httpd->opt.scb.file.close (httpd, ctx->handle);
+}
+
+static int task_main_getfseg (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	qse_ssize_t n;
+	qse_size_t count;
+	task_getfseg_t* ctx = (task_getfseg_t*)task->ctx;
+
+	count = MAX_SEND_SIZE;
+	if (count >= ctx->left) count = ctx->left;
+
+	httpd->errnum = QSE_HTTPD_ENOERR;
+	n = httpd->opt.scb.client.sendfile (
+		httpd, client, ctx->handle, &ctx->offset, count);
+	if (n <= -1) 
+	{
+/* HANDLE EGAIN specially??? */
+		if (httpd->errnum != QSE_HTTPD_EAGAIN)
+		{
+			/* TODO: logging */
+			return -1; 
+		}
+
+		goto more_work;
+	}
+
+	if (n == 0 && count > 0)
+	{
+		/* The file could be truncated when this condition is set.
+		 * The content-length sent in the header can't be fulfilled. 
+		 * So let's return an error here so that the main loop abort 
+		 * the connection. */
+/* TODO: any logging....??? */
+		return -1;
+	}
+
+	ctx->left -= n;
+	if (ctx->left <= 0) return 0;
+
+more_work:
+	return 1; /* more work to do */
+}
+
+static qse_httpd_task_t* entask_getfseg (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred,
+	qse_httpd_hnd_t handle, qse_foff_t offset, qse_foff_t size)
+{
+	qse_httpd_task_t task;
+	task_getfseg_t data;
+
+	QSE_MEMSET (&data, 0, QSE_SIZEOF(data));
+	data.handle = handle;
+	data.offset = offset;
+	data.left = size;
+
+	QSE_MEMSET (&task, 0, QSE_SIZEOF(task));
+	task.init = task_init_getfseg;
+	task.main = task_main_getfseg;
+	task.fini = task_fini_getfseg;
+	task.ctx = &data;
+
+	return qse_httpd_entask (httpd, client, pred, &task, QSE_SIZEOF(data));
+}
+
+/*------------------------------------------------------------------------*/
+
+
+static int task_init_getfile (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_file_t* file = qse_httpd_gettaskxtn (httpd, task);
+	task_file_t* arg = (task_file_t*)task->ctx;
+
+	QSE_MEMCPY (file, arg, QSE_SIZEOF(*file));
+
+	file->path.ptr = (qse_mchar_t*)(file + 1);
+	qse_mbscpy ((qse_mchar_t*)file->path.ptr, arg->path.ptr);
+	if (arg->u.get.mime.ptr)
+	{
+		file->u.get.mime.ptr = file->path.ptr + file->path.len + 1;
+		qse_mbscpy ((qse_mchar_t*)file->u.get.mime.ptr, arg->u.get.mime.ptr);
+	}
+
+	task->ctx = file;
+	return 0;
+}
+
+static QSE_INLINE int task_main_getfile (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_file_t* file;
+	qse_httpd_task_t* x;
+	qse_httpd_hnd_t handle;
+	int fileopen = 0;
+	qse_httpd_stat_t st;
+
+	file = (task_file_t*)task->ctx;
+	x = task;
+
+/* TODO: if you should deal with files on a network-mounted drive,
+         setting a trigger or non-blocking I/O are needed. */
+
+	httpd->errnum = QSE_HTTPD_ENOERR;
+	if (httpd->opt.scb.file.stat (httpd, file->path.ptr, &st) <= -1)
+	{
+		int http_errnum;
+		http_errnum = (httpd->errnum == QSE_HTTPD_ENOENT)? 404:
+		              (httpd->errnum == QSE_HTTPD_EACCES)? 403: 500;
+		x = qse_httpd_entaskerrorwithmvk (
+			httpd, client, x, http_errnum, 
+			file->method, &file->version, file->keepalive);
+		goto no_file_send;
+	}
+
+	httpd->errnum = QSE_HTTPD_ENOERR;
+	if (httpd->opt.scb.file.ropen (httpd, file->path.ptr, &handle) <= -1)
+	{
+		int http_errnum;
+		http_errnum = (httpd->errnum == QSE_HTTPD_ENOENT)? 404:
+		              (httpd->errnum == QSE_HTTPD_EACCES)? 403: 500;
+		x = qse_httpd_entaskerrorwithmvk (
+			httpd, client, x, http_errnum, 
+			file->method, &file->version, file->keepalive);
+		goto no_file_send;
+	}
+	fileopen = 1;
+
+	if (file->u.get.range.type != QSE_HTTP_RANGE_NONE)
+	{ 
+		qse_mchar_t tmp[4][64];
+		qse_mchar_t etag[ETAG_LEN_MAX + 1];
+		qse_size_t etag_len;
+
+		if (file->u.get.range.type == QSE_HTTP_RANGE_SUFFIX)
+		{
+			if (file->u.get.range.to > st.size) file->u.get.range.to = st.size;
+			file->u.get.range.from = st.size - file->u.get.range.to;
+			file->u.get.range.to = file->u.get.range.to + file->u.get.range.from;
+			if (st.size > 0) file->u.get.range.to--;
+		}
+
+		if (file->u.get.range.from >= st.size)
+		{
+			x = qse_httpd_entaskerrorwithmvk (
+				httpd, client, x, 416, file->method, &file->version, file->keepalive);
+			goto no_file_send;
+		}
+
+		if (file->u.get.range.to >= st.size) file->u.get.range.to = st.size - 1;
+
+		qse_fmtuintmaxtombs (tmp[0], QSE_COUNTOF(tmp[0]), (file->u.get.range.to - file->u.get.range.from + 1), 10, -1, QSE_MT('\0'), QSE_NULL);
+		qse_fmtuintmaxtombs (tmp[1], QSE_COUNTOF(tmp[1]), file->u.get.range.from, 10, -1, QSE_MT('\0'), QSE_NULL);
+		qse_fmtuintmaxtombs (tmp[2], QSE_COUNTOF(tmp[2]), file->u.get.range.to, 10, -1, QSE_MT('\0'), QSE_NULL);
+		qse_fmtuintmaxtombs (tmp[3], QSE_COUNTOF(tmp[3]), st.size, 10, -1, QSE_MT('\0'), QSE_NULL);
+
+		etag_len = qse_fmtuintmaxtombs (&etag[0], QSE_COUNTOF(etag), st.mtime.sec, 16, -1, QSE_MT('\0'), QSE_NULL);
+		etag[etag_len++] = QSE_MT('-');
+		etag_len += qse_fmtuintmaxtombs (&etag[etag_len], QSE_COUNTOF(etag), st.mtime.nsec, 16, -1, QSE_MT('\0'), QSE_NULL);
+		etag[etag_len++] = QSE_MT('-');
+		etag_len += qse_fmtuintmaxtombs (&etag[etag_len], QSE_COUNTOF(etag) - etag_len, st.size, 16, -1, QSE_MT('\0'), QSE_NULL);
+		etag[etag_len++] = QSE_MT('-');
+		etag_len += qse_fmtuintmaxtombs (&etag[etag_len], QSE_COUNTOF(etag) - etag_len, st.ino, 16, -1, QSE_MT('\0'), QSE_NULL);
+		etag[etag_len++] = QSE_MT('-');
+		etag_len += qse_fmtuintmaxtombs (&etag[etag_len], QSE_COUNTOF(etag) - etag_len, st.dev, 16, -1, QSE_MT('\0'), QSE_NULL);
+
+		x = qse_httpd_entaskformat (
+			httpd, client, x,
+    			QSE_MT("HTTP/%d.%d 206 Partial Content\r\nServer: %s\r\nDate: %s\r\nConnection: %s\r\n%s%s%sContent-Length: %s\r\nContent-Range: bytes %s-%s/%s\r\nAccept-Ranges: bytes\r\nLast-Modified: %s\r\nETag: %s\r\n\r\n"), 
+			file->version.major, file->version.minor,
+			qse_httpd_getname (httpd),
+			qse_httpd_fmtgmtimetobb (httpd, QSE_NULL, 0),
+			(file->keepalive? QSE_MT("keep-alive"): QSE_MT("close")),
+			(file->u.get.mime.len > 0? QSE_MT("Content-Type: "): QSE_MT("")),
+			(file->u.get.mime.len > 0? file->u.get.mime.ptr: QSE_MT("")),
+			(file->u.get.mime.len > 0? QSE_MT("\r\n"): QSE_MT("")),
+			((file->method == QSE_HTTP_HEAD)? QSE_MT("0"): tmp[0]),
+			tmp[1], tmp[2], tmp[3],
+			qse_httpd_fmtgmtimetobb (httpd, &st.mtime, 1),
+			etag
+		);
+		if (x)
+		{
+			if (file->method == QSE_HTTP_HEAD) goto no_file_send;
+			x = entask_getfseg (
+				httpd, client, x, handle, 
+				file->u.get.range.from, 
+				(file->u.get.range.to - file->u.get.range.from + 1)
+			);
+		}
+	}
+	else
+	{
+		qse_mchar_t b_fsize[64];
+		qse_mchar_t etag[ETAG_LEN_MAX + 1];
+		qse_size_t etag_len;
+
+		etag_len = qse_fmtuintmaxtombs (&etag[0], QSE_COUNTOF(etag), st.mtime.sec, 16, -1, QSE_MT('\0'), QSE_NULL);
+		etag[etag_len++] = QSE_MT('-');
+		etag_len += qse_fmtuintmaxtombs (&etag[etag_len], QSE_COUNTOF(etag), st.mtime.nsec, 16, -1, QSE_MT('\0'), QSE_NULL);
+		etag[etag_len++] = QSE_MT('-');
+		etag_len += qse_fmtuintmaxtombs (&etag[etag_len], QSE_COUNTOF(etag) - etag_len, st.size, 16, -1, QSE_MT('\0'), QSE_NULL);
+		etag[etag_len++] = QSE_MT('-');
+		etag_len += qse_fmtuintmaxtombs (&etag[etag_len], QSE_COUNTOF(etag) - etag_len, st.ino, 16, -1, QSE_MT('\0'), QSE_NULL);
+		etag[etag_len++] = QSE_MT('-');
+		etag_len += qse_fmtuintmaxtombs (&etag[etag_len], QSE_COUNTOF(etag) - etag_len, st.dev, 16, -1, QSE_MT('\0'), QSE_NULL);
+
+		if ((file->u.get.if_none_match[0] != QSE_MT('\0') && qse_mbscmp (etag, file->u.get.if_none_match) == 0) ||
+		    (file->u.get.if_modified_since.sec > 0 && st.mtime.sec <= file->u.get.if_modified_since.sec)) 
+		{
+			/* i've converted milliseconds to seconds before timestamp comparison
+			 * because st.mtime has the actual milliseconds less than 1 second
+			 * while if_modified_since doesn't have such small milliseconds */
+			x = qse_httpd_entask_nomod (httpd, client, x, file->method, &file->version, file->keepalive);
+			goto no_file_send;
+		}
+
+		qse_fmtuintmaxtombs (b_fsize, QSE_COUNTOF(b_fsize), st.size, 10, -1, QSE_MT('\0'), QSE_NULL);
+
+		/* wget 1.8.2 set 'Connection: keep-alive' in the http 1.0 header.
+		 * if the reply doesn't contain 'Connection: keep-alive', it didn't
+		 * close connection.*/
+
+		x = qse_httpd_entaskformat (
+			httpd, client, x,
+    			QSE_MT("HTTP/%d.%d 200 OK\r\nServer: %s\r\nDate: %s\r\nConnection: %s\r\n%s%s%sContent-Length: %s\r\nAccept-Ranges: bytes\r\nLast-Modified: %s\r\nETag: %s\r\n\r\n"), 
+			file->version.major, file->version.minor,
+			qse_httpd_getname (httpd),
+			qse_httpd_fmtgmtimetobb (httpd, QSE_NULL, 0),
+			(file->keepalive? QSE_MT("keep-alive"): QSE_MT("close")),
+			(file->u.get.mime.len > 0? QSE_MT("Content-Type: "): QSE_MT("")),
+			(file->u.get.mime.len > 0? file->u.get.mime.ptr: QSE_MT("")),
+			(file->u.get.mime.len > 0? QSE_MT("\r\n"): QSE_MT("")),
+			((file->method == QSE_HTTP_HEAD)? QSE_MT("0"): b_fsize),
+			qse_httpd_fmtgmtimetobb (httpd, &st.mtime, 1),
+			etag
+		);
+		if (x) 
+		{
+			if (file->method == QSE_HTTP_HEAD) goto no_file_send;
+			x = entask_getfseg (httpd, client, x, handle, 0, st.size);
+		}
+	}
+
+	if (x) return 0;
+	httpd->opt.scb.file.close (httpd, handle);
+	return -1;
+
+no_file_send:
+	if (fileopen) httpd->opt.scb.file.close (httpd, handle);
+	return (x == QSE_NULL)? -1: 0;
+}
+
+/*------------------------------------------------------------------------*/
+
+static int write_file (qse_httpd_t* httpd, qse_httpd_hnd_t handle, const qse_mchar_t* ptr, qse_size_t len)
+{
+	qse_ssize_t n;
+	qse_size_t pos = 0;
+
+	/* this implementation assumes that file writing will never get 
+	 * blocked in practice. so no i/o multiplexing is performed over
+	 * file descriptors */
+	while (pos < len)
+	{
+		n = httpd->opt.scb.file.write (httpd, handle, &ptr[pos], len - pos);
+		if (n <= 0) return -1;
+		pos += n;
+	}
+
+	return 0;
+}
+
+static int putfile_snatch_client_input (
+	qse_htre_t* req, const qse_mchar_t* ptr, qse_size_t len, void* ctx)
+{
+	qse_httpd_task_t* task;
+	task_file_t* file; 
+
+	task = (qse_httpd_task_t*)ctx;
+	file = (task_file_t*)task->ctx;
+
+	if (ptr == QSE_NULL)
+	{
+		/*
+		 * this callback is called with ptr of QSE_NULL 
+		 * when the request is completed or discarded. 
+		 * and this indicates that there's nothing more to read
+		 * from the client side. this can happen when the end of
+		 * a request is seen or when an error occurs 
+		 */
+		QSE_ASSERT (len == 0);
+
+		/* mark the there's nothing to read form the client side */
+		qse_htre_unsetconcb (file->u.put.req);
+		file->u.put.req = QSE_NULL; 
+
+		/* since there is no more to read from the client side.
+		 * the trigger is not needed any more. */
+		task->trigger.v[0].mask = 0;
+	}
+	else if (!(file->u.put.flags & PUTFILE_WRITE_FAILED))
+	{
+		if (write_file (file->u.put.httpd, file->u.put.handle, ptr, len) <= -1)
+		{
+			file->u.put.flags |= PUTFILE_WRITE_FAILED;
+			file->u.put.status = 500;
+		}
+	}
+
+	return 0;
+}
+
+static int task_init_putfile (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_file_t* file = qse_httpd_gettaskxtn (httpd, task);
+	task_file_t* arg = (task_file_t*)task->ctx;
+	qse_httpd_stat_t st;
+
+	/* zero out the task's extension area */
+	QSE_MEMCPY (file, arg, QSE_SIZEOF(*file));
+	file->u.put.req = QSE_NULL;
+	
+	/* copy in the path name to the area */
+	file->path.ptr = (qse_mchar_t*)(file + 1);
+	qse_mbscpy ((qse_mchar_t*)file->path.ptr, arg->path.ptr);
+	file->u.put.status = 204; /* 200 should also be ok to indicate success. */
+	task->ctx = file; /* switch the task context to the extension area */
+
+	httpd->errnum = QSE_HTTPD_ENOERR;
+	if (httpd->opt.scb.file.stat (httpd, file->path.ptr, &st) <= -1)
+	{
+		if (httpd->errnum == QSE_HTTPD_ENOENT) 
+		{
+			/* stat found no such file. so if the request is achived
+			 * successfully, it should send '201 Created' */
+			file->u.put.status = 201;
+		}
+	}
+
+	httpd->errnum = QSE_HTTPD_ENOERR;
+	if (httpd->opt.scb.file.wopen (httpd, file->path.ptr, &file->u.put.handle) <= -1) 
+	{
+		file->u.put.status = (httpd->errnum == QSE_HTTPD_EACCES)? 403: 500;
+		goto oops;
+	}
+
+	if (write_file (httpd, file->u.put.handle, qse_htre_getcontentptr(arg->u.put.req), qse_htre_getcontentlen(arg->u.put.req)) <= -1) 
+	{
+		httpd->opt.scb.file.close (httpd, file->u.put.handle);
+		file->u.put.status = 500;
+		goto oops;
+	}
+
+	if (!(arg->u.put.req->state & QSE_HTRE_DISCARDED) &&
+	    !(arg->u.put.req->state & QSE_HTRE_COMPLETED))
+	{
+		/* set up a callback to be called when the request content
+		 * is fed to the htrd reader. qse_htre_addcontent() that 
+		 * htrd calls invokes this callback. */
+		file->u.put.req = arg->u.put.req;
+		qse_htre_setconcb (file->u.put.req, putfile_snatch_client_input, task);
+	}
+
+	/* no triggers yet since the main loop doesn't allow me to set 
+	 * triggers in the task initializer. however the main task handler
+	 * will be invoked so long as the client handle is writable by
+	 * the main loop. */
+	return 0;
+
+oops:
+	/* since a new task can't be added in the initializer,
+	 * i mark that initialization failed and let task_main_putfile()
+	 * add an error task */
+	qse_htre_discardcontent (arg->u.put.req);
+	file->u.put.flags |= PUTFILE_INIT_FAILED;
+	return 0;
+}
+
+static void task_fini_putfile (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_file_t* file = (task_file_t*)task->ctx;
+
+	if (!(file->u.put.flags & PUTFILE_INIT_FAILED))
+		httpd->opt.scb.file.close (httpd, file->u.put.handle);
+}
+
+static int task_main_putfile_2 (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_file_t* file = (task_file_t*)task->ctx;
+
+	if (file->u.put.req)
+	{
+		/* file->u.put.req is set to a non-NULL value if snatching
+		 * is needed in the task_init_putfile(). and it's reset to
+		 * QSE_NULL when snatching is over in putfile_snatch_client_input().
+		 * i set a trigger so that the task is executed
+		 * while there is input from the client side  */
+		/*task->trigger.v[0].mask = QSE_HTTPD_TASK_TRIGGER_READ;
+		task->trigger.v[0].handle = client->handle;*/
+		task->trigger.cmask = QSE_HTTPD_TASK_TRIGGER_READ;
+		return 1; /* trigger me when a client sends data  */
+	}
+
+	/* snatching is over. writing error may have occurred as well.
+	 * file->u.put.status should hold a proper status code */
+	if (qse_httpd_entaskerrorwithmvk (
+		httpd, client, task, file->u.put.status,
+		file->method, &file->version, file->keepalive) == QSE_NULL) return -1;
+	return 0; /* no more data to read. task over */
+}
+
+static int task_main_putfile (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_file_t* file = (task_file_t*)task->ctx;
+
+	if (!(file->u.put.flags & PUTFILE_INIT_FAILED) && file->u.put.req)
+	{
+		/* initialization was successful and snatching is required. 
+		 * switch to the next phase. */
+		task->main = task_main_putfile_2;
+		return task_main_putfile_2 (httpd, client, task);
+	}
+
+	/* snatching is not required or initialization error has occurred.
+	 * file->u.put.status should hold a proper status code.
+	 *
+	 * note: if initialization error occurred and there is contents for the
+	 * client to send, this reply may get to the client before it finishes 
+	 * sending the contents. */
+	if (qse_httpd_entaskerrorwithmvk (
+		httpd, client, task, file->u.put.status,
+		file->method, &file->version, file->keepalive) == QSE_NULL) return -1;
+	return 0; /* task over */
+}
+
+/*------------------------------------------------------------------------*/
+
+qse_httpd_task_t* qse_httpd_entaskfile (
+	qse_httpd_t* httpd,
+	qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred,
+	const qse_mchar_t* path,
+	const qse_mchar_t* mime,
+	qse_htre_t* req)
+{
+	qse_httpd_task_t task;
+	task_file_t data;
+	const qse_htre_hdrval_t* tmp;
+	qse_size_t xtnsize;
+
+	QSE_MEMSET (&data, 0, QSE_SIZEOF(data));
+	data.path.ptr = (qse_mchar_t*)path;
+	data.path.len = qse_mbslen(path);
+	data.version = *qse_htre_getversion(req);
+	data.keepalive = (req->flags & QSE_HTRE_ATTR_KEEPALIVE);
+	data.method = qse_htre_getqmethodtype(req);
+
+	xtnsize = QSE_SIZEOF(task_file_t) + data.path.len + 1;
+
+	QSE_MEMSET (&task, 0, QSE_SIZEOF(task));
+
+	switch (data.method)
+	{
+		case QSE_HTTP_OPTIONS:
+			qse_htre_discardcontent (req);
+			return qse_httpd_entaskallow (httpd, client, pred, 
+				QSE_MT("OPTIONS,GET,HEAD,POST,PUT,DELETE"), req);
+
+		case QSE_HTTP_HEAD:
+		case QSE_HTTP_GET:
+		case QSE_HTTP_POST:
+			qse_htre_discardcontent (req);
+
+			if (mime)
+			{
+				data.u.get.mime.ptr = (qse_mchar_t*)mime;
+				data.u.get.mime.len = qse_mbslen(mime);
+				xtnsize += data.u.get.mime.len + 1;
+			}
+
+			tmp = qse_htre_getheaderval(req, QSE_MT("If-None-Match"));
+			if (tmp)
+			{
+				/*while (tmp->next) tmp = tmp->next;*/ /* get the last value */
+				qse_mbsxcpy (data.u.get.if_none_match, QSE_COUNTOF(data.u.get.if_none_match), tmp->ptr);
+			}
+			if (data.u.get.if_none_match[0] == QSE_MT('\0'))
+			{
+				/* Both ETag and Last-Modified are included in the reply.
+				 * If the client understand ETag, it can choose to include 
+				 * If-None-Match in the request. If it understands Last-Modified,
+				 * it can choose to include If-Modified-Since. I don't care
+				 * the client understands both and include both of them
+				 * in the request.
+				 *
+				 * I check If-None-Match if it's included.
+				 * I check If-Modified-Since if If-None-Match is not included.
+				 */
+				tmp = qse_htre_getheaderval(req, QSE_MT("If-Modified-Since"));
+				if (tmp)
+				{
+					/*while (tmp->next) tmp = tmp->next;*/ /* get the last value */
+					if (qse_parsehttptime (tmp->ptr, &data.u.get.if_modified_since) <= -1)
+					{
+						data.u.get.if_modified_since.sec = 0;
+						data.u.get.if_modified_since.nsec = 0;
+					}
+				}
+			}
+
+			tmp = qse_htre_getheaderval(req, QSE_MT("Range"));
+			if (tmp) 
+			{
+				/*while (tmp->next) tmp = tmp->next;*/ /* get the last value */
+				if (qse_parsehttprange (tmp->ptr, &data.u.get.range) <= -1)
+				{
+					return qse_httpd_entaskerror (httpd, client, pred, 416, req);
+				}
+			}
+			else 
+			{
+				data.u.get.range.type = QSE_HTTP_RANGE_NONE;
+			}
+
+			task.init = task_init_getfile;
+			task.main = task_main_getfile;
+
+			task.ctx = &data;
+			return qse_httpd_entask (httpd, client, pred, &task, xtnsize);
+
+		case QSE_HTTP_PUT:
+			/* note that no partial update is supported for PUT */
+			data.u.put.httpd = httpd;
+			data.u.put.req = req;
+			task.init = task_init_putfile;
+			task.main = task_main_putfile;
+			task.fini = task_fini_putfile;
+			task.ctx = &data;
+			return qse_httpd_entask (httpd, client, pred, &task, xtnsize);
+
+		case QSE_HTTP_DELETE:
+		{
+			int status = 200;
+
+			qse_htre_discardcontent (req);
+			if (httpd->opt.scb.file.purge (httpd, path) <= -1)
+			{
+				status = (httpd->errnum == QSE_HTTPD_ENOENT)? 404:
+				         (httpd->errnum == QSE_HTTPD_EACCES)? 403: 500;
+			}
+				
+			return qse_httpd_entaskerror (httpd, client, pred, status, req);
+		}
+
+		default:
+			/* Method not allowed */
+			qse_htre_discardcontent (req);
+			return qse_httpd_entaskerror (httpd, client, pred, 405, req);
+	}
+}
+

lib/http/httpd-std-mod.h

@@ -0,0 +1,215 @@
+/* Override the global definition QSE_ENABLE_STATIC_MODULE
+ * for httpd on platforms with mature dynamic loading support. 
+ */
+#if defined(QSE_ENABLE_STATIC_MODULE) && \
+    (defined(USE_LTDL) || defined(_WIN32) || defined(__OS2__))
+#	undef QSE_ENABLE_STATIC_MODULE
+#endif
+
+static void* mod_open (qse_httpd_t* httpd, const qse_char_t* sysname)
+{
+#if defined(USE_LTDL)
+	void* h;
+	qse_mchar_t* modpath;
+
+	#if defined(QSE_CHAR_IS_MCHAR)
+	modpath = sysname;
+	#else
+	modpath = qse_wcstombsdup (sysname, QSE_NULL, qse_httpd_getmmgr(httpd));
+	if (!modpath)
+	{
+		qse_httpd_seterrnum (httpd, QSE_HTTPD_ENOMEM);
+		return QSE_NULL;
+	}
+	#endif
+
+	h = lt_dlopenext (modpath);
+	if (!h) qse_httpd_seterrnum (httpd, syserr_to_errnum(errno));
+
+	#if defined(QSE_CHAR_IS_MCHAR)
+	/* do nothing */
+	#else
+	QSE_MMGR_FREE (qse_httpd_getmmgr(httpd), modpath);
+	#endif
+
+	return h;
+
+#elif defined(_WIN32)
+
+	HMODULE h;
+
+	h = LoadLibrary (sysname);
+	if (!h) qse_httpd_seterrnum (httpd, syserr_to_errnum(GetLastError()));
+
+	QSE_ASSERT (QSE_SIZEOF(h) <= QSE_SIZEOF(void*));
+	return h;
+
+#elif defined(__OS2__)
+
+	HMODULE h;
+	qse_mchar_t* modpath;
+	char errbuf[CCHMAXPATH];
+	APIRET rc;
+
+	#if defined(QSE_CHAR_IS_MCHAR)
+	modpath = sysname;
+	#else
+	modpath = qse_wcstombsdup (sysname, QSE_NULL, qse_httpd_getmmgr(httpd));
+	if (!modpath)
+	{
+		qse_httpd_seterrnum (httpd, QSE_HTTPD_ENOMEM);
+		return QSE_NULL;
+	}
+	#endif
+
+	/* DosLoadModule() seems to have severe limitation on 
+	 * the file name it can load (max-8-letters.xxx) */
+	rc = DosLoadModule (errbuf, QSE_COUNTOF(errbuf) - 1, modpath, &h);
+	if (rc != NO_ERROR) 
+	{
+		qse_httpd_seterrnum (httpd, syserr_to_errnum(rc));
+		h = QSE_NULL;
+	}
+
+	#if defined(QSE_CHAR_IS_MCHAR)
+	/* do nothing */
+	#else
+	QSE_MMGR_FREE (qse_httpd_getmmgr(httpd), modpath);
+	#endif
+
+	QSE_ASSERT (QSE_SIZEOF(h) <= QSE_SIZEOF(void*));
+	return h;
+
+#elif defined(__DOS__) && defined(QSE_ENABLE_DOS_DYNAMIC_MODULE)
+
+	/* the DOS code here is not generic enough. it's for a specific
+	 * dos-extender only. the best is to disable dynamic loading
+	 * when building for DOS. */
+	void* h;
+	qse_mchar_t* modpath;
+
+	#if defined(QSE_CHAR_IS_MCHAR)
+	modpath = sysname;
+	#else
+	modpath = qse_wcstombsdup (sysname, QSE_NULL, qse_httpd_getmmgr(httpd));
+	if (!modpath)
+	{
+		qse_httpd_seterrnum (httpd, QSE_HTTPD_ENOMEM);
+		return QSE_NULL;
+	}
+	#endif
+
+	h = LoadModule (modpath);
+	if (!h) qse_httpd_seterrnum (httpd, syserr_to_errnum(errno));
+
+	#if defined(QSE_CHAR_IS_MCHAR)
+	/* do nothing */
+	#else
+	QSE_MMGR_FREE (qse_httpd_getmmgr(httpd), modpath);
+	#endif
+
+	QSE_ASSERT (QSE_SIZEOF(h) <= QSE_SIZEOF(void*));
+	return h;
+#elif defined(USE_DLFCN)
+
+	void* h;
+	qse_mchar_t* modpath;
+
+	#if defined(QSE_CHAR_IS_MCHAR)
+	modpath = sysname;
+	#else
+	modpath = qse_wcstombsdup (sysname, QSE_NULL, qse_httpd_getmmgr(httpd));
+	if (!modpath)
+	{
+		qse_httpd_seterrnum (httpd, QSE_HTTPD_ENOMEM);
+		return QSE_NULL;
+	}
+	#endif
+
+	h = dlopen(modpath, RTLD_NOW);
+	if (!h) qse_httpd_seterrnum (httpd, QSE_HTTPD_ESYSERR);
+
+	#if defined(QSE_CHAR_IS_MCHAR)
+	/* do nothing */
+	#else
+	QSE_MMGR_FREE (qse_httpd_getmmgr(httpd), modpath);
+	#endif
+
+	return h;
+
+#else
+	qse_httpd_seterrnum (httpd, QSE_HTTPD_ENOIMPL);
+	return QSE_NULL;
+#endif
+}
+
+static void mod_close (qse_httpd_t* httpd, void* handle)
+{
+#if defined(USE_LTDL)
+	lt_dlclose (handle);
+#elif defined(_WIN32)
+	FreeLibrary ((HMODULE)handle);
+#elif defined(__OS2__)
+	DosFreeModule ((HMODULE)handle);
+#elif defined(__DOS__) && defined(QSE_ENABLE_DOS_DYNAMIC_MODULE)
+	FreeModule (handle);
+#elif defined(USE_DLFCN)
+	dlclose (handle);
+#else
+	/* nothing to do */
+#endif
+}
+
+static void* mod_symbol (qse_httpd_t* httpd, void* handle, const qse_char_t* name)
+{
+	void* s;
+	qse_mchar_t* mname;
+
+#if defined(QSE_CHAR_IS_MCHAR)
+	mname = name;
+#else
+	mname = qse_wcstombsdup (name, QSE_NULL, qse_httpd_getmmgr(httpd));
+	if (!mname)
+	{
+		qse_httpd_seterrnum (httpd, QSE_HTTPD_ENOMEM);
+		return QSE_NULL;
+	}
+#endif
+
+
+#if defined(USE_LTDL)
+	s = lt_dlsym (handle, mname);
+	if (s == QSE_NULL) qse_httpd_seterrnum (httpd, syserr_to_errnum(errno));
+#elif defined(_WIN32)
+	s = GetProcAddress ((HMODULE)handle, mname);
+	if (s == QSE_NULL) qse_httpd_seterrnum (httpd, syserr_to_errnum(GetLastError()));
+#elif defined(__OS2__)
+	{
+		APIRET rc;
+		rc = DosQueryProcAddr ((HMODULE)handle, 0, mname, (PFN*)&s);
+		if (rc != NO_ERROR) 
+		{
+			qse_httpd_seterrnum (httpd, syserr_to_errnum(rc));
+			s = QSE_NULL;
+		}
+	}
+#elif defined(__DOS__) && defined(QSE_ENABLE_DOS_DYNAMIC_MODULE)
+	s = GetProcAddress (handle, mname);
+	if (s == QSE_NULL) qse_httpd_seterrnum (httpd, syserr_to_errnum(errno));
+#elif defined(USE_DLFCN)
+	s = dlsym (handle, mname);
+	if (s == QSE_NULL) qse_httpd_seterrnum (httpd, QSE_HTTPD_ESYSERR);
+#else
+	s = QSE_NULL;
+	qse_httpd_seterrnum (httpd, QSE_HTTPD_ENOIMPL);
+#endif
+
+#if defined(QSE_CHAR_IS_MCHAR)
+	/* nothing to do */
+#else
+	QSE_MMGR_FREE (qse_httpd_getmmgr(httpd), mname);
+#endif
+
+	return s;
+}
+

lib/http/httpd-std-urs.h

@@ -0,0 +1,642 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* 
+ * This file holds url rewriting support code and is included by httpd-std.c
+ */
+
+#define URS_SEQ_RANGE_SIZE (QSE_TYPE_MAX(qse_uint16_t) - 2)
+#define URS_MAX_URL_LEN 50000
+
+typedef struct urs_hdr_t urs_hdr_t;
+typedef struct urs_pkt_t urs_pkt_t;
+typedef struct urs_ctx_t urs_ctx_t;
+typedef struct urs_req_t urs_req_t;
+
+#include <qse/pack1.h>
+struct urs_hdr_t
+{
+	qse_uint16_t seq;    /* in network-byte order */
+	qse_uint16_t rcode;  /* response code */
+	qse_uint32_t urlsum; /* checksum of url in the request */
+	qse_uint16_t pktlen; /* packet header size + url length */
+};
+
+struct urs_pkt_t
+{
+	struct urs_hdr_t hdr;
+	qse_mchar_t url[1];
+};
+#include <qse/unpack.h>
+
+struct urs_ctx_t
+{
+	qse_httpd_t* httpd;
+	qse_httpd_urs_t* urs;
+
+	qse_skad_t skad;
+	int skadlen;
+	int urs_socket; /* default urs socket to use */
+
+	qse_uint16_t seq; /* TODO: change to uint32_t??? */
+	urs_req_t* reqs[1024]; /* TOOD: choose the right size */
+	qse_uint16_t req_count;
+
+	qse_uint8_t rcvbuf[QSE_SIZEOF(urs_hdr_t) + URS_MAX_URL_LEN + 1];
+	qse_uint8_t fmtbuf[QSE_SIZEOF(urs_hdr_t) + URS_MAX_URL_LEN + 1];
+
+#if defined(AF_UNIX)
+	struct sockaddr_un unix_bind_addr;
+#endif
+};
+
+struct urs_req_t
+{
+	qse_uint16_t seq; /* in host-byte order */
+	qse_uint32_t pktlen;
+	urs_pkt_t* pkt;
+
+	qse_httpd_rewrite_t rewrite;
+	void* ctx;
+
+	urs_ctx_t* dc;
+	qse_skad_t urs_skad;
+	int urs_skadlen;
+	int urs_socket;
+	int urs_retries;
+	qse_ntime_t urs_tmout;
+
+	qse_tmr_index_t tmr_tmout;
+
+	urs_req_t* prev;
+	urs_req_t* next;
+};
+
+
+static int urs_open (qse_httpd_t* httpd, qse_httpd_urs_t* urs)
+{
+	qse_nwad_t nwad;
+	urs_ctx_t* dc;
+	httpd_xtn_t* httpd_xtn = GET_HTTPD_XTN(httpd);
+	int type, proto = 0; /*IPPROTO_UDP;*/ /*IPPROTO_SCTP*/
+
+	urs->handle[0] = QSE_INVALID_SCKHND;
+	urs->handle[1] = QSE_INVALID_SCKHND;
+	urs->handle[2] = QSE_INVALID_SCKHND;
+
+	dc = (urs_ctx_t*) qse_httpd_callocmem (httpd, QSE_SIZEOF(urs_ctx_t));
+	if (dc == NULL) goto oops;
+
+	dc->httpd = httpd;
+	dc->urs = urs;
+
+	nwad = httpd_xtn->urs.nwad;
+	if (nwad.type != QSE_NWAD_NX && qse_getnwadport(&nwad) == 0) 
+		qse_setnwadport (&nwad, qse_hton16(QSE_HTTPD_URSSTD_DEFAULT_PORT));
+
+#if defined(QSE_HTTPD_DEBUG)
+	{
+		qse_mchar_t tmp[128];
+		qse_nwadtombs (&nwad, tmp, QSE_COUNTOF(tmp), QSE_NWADTOMBS_ALL);
+		HTTPD_DBGOUT1 ("Default URS server set to [%hs]\n", tmp);
+	}
+#endif
+
+#if defined(IPPROTO_SCTP)
+	type = (proto == IPPROTO_SCTP)? SOCK_SEQPACKET: SOCK_DGRAM;
+#else
+	type = SOCK_DGRAM;
+#endif
+
+	urs->handle[0] = open_client_socket (httpd, AF_INET, type, proto);
+#if defined(AF_INET6)
+	urs->handle[1] = open_client_socket (httpd, AF_INET6, type, proto);
+#endif
+#if defined(AF_UNIX)
+	urs->handle[2] = open_client_socket (httpd, AF_UNIX, type, 0);
+#endif
+
+	if (qse_is_sck_valid(urs->handle[2]))
+	{
+	#if defined(AF_UNIX)
+		qse_ntime_t now;
+
+		qse_gettime (&now);
+
+		QSE_MEMSET (&dc->unix_bind_addr, 0, QSE_SIZEOF(dc->unix_bind_addr));
+		dc->unix_bind_addr.sun_family = AF_UNIX;
+
+		/* TODO: make the location(/tmp) or the prefix(.urs-) of the socket file configurable??? */
+		qse_mbsxfmt (
+			dc->unix_bind_addr.sun_path, 
+			QSE_COUNTOF(dc->unix_bind_addr.sun_path),
+			QSE_MT("/tmp/.urs-%x-%lu"), (int)QSE_GETPID(), (unsigned long int)urs->handle[2]);
+		QSE_UNLINK (dc->unix_bind_addr.sun_path);
+		if (bind (urs->handle[2], (struct sockaddr*)&dc->unix_bind_addr, QSE_SIZEOF(dc->unix_bind_addr)) <= -1)
+		{
+			qse_httpd_seterrnum (httpd, SKERR_TO_ERRNUM());
+			qse_close_sck (urs->handle[2]);
+			urs->handle[2] = QSE_INVALID_SCKHND;
+		}
+	#endif
+	}
+
+	if (!qse_is_sck_valid(urs->handle[0]) && 
+	    !qse_is_sck_valid(urs->handle[1]) &&
+	    !qse_is_sck_valid(urs->handle[2]))
+	{
+		/* don't set the error number here.
+		 * open_client_socket() or bind() above should set the error number */
+		goto oops;
+	}
+
+	/* carry on regardless of success or failure */
+	dc->skadlen = qse_nwadtoskad (&nwad, &dc->skad);
+
+	/* determine which socket to use when sending a request to the default server */
+	if (dc->skadlen >= 0)
+	{
+		switch (nwad.type)
+		{
+			case QSE_NWAD_IN4:
+				dc->urs_socket = urs->handle[0];
+				break;
+			case QSE_NWAD_IN6:
+				dc->urs_socket = urs->handle[1];
+				break;
+			case QSE_NWAD_LOCAL:
+				dc->urs_socket = urs->handle[2];
+				break;
+			default:
+				/* unsupported address for the default server */
+				dc->urs_socket = QSE_INVALID_SCKHND;
+				break;
+		}
+	}
+	else
+	{
+		dc->urs_socket = QSE_INVALID_SCKHND;
+	}
+
+#if 0
+	if (proto == IPPROTO_SCTP)
+	{
+/* TODO: error handling */
+		if (qse_is_sck_valid(urs->handle[0])) listen (urs->handle[0], 99);
+		if (qse_is_sck_valid(urs->handle[1])) listen (urs->handle[1], 99);
+		/* handle[2] is a unix socket. no special handling for SCTP */
+	}
+#endif
+
+	urs->handle_count = 3;
+	if (qse_is_sck_valid(urs->handle[0])) urs->handle_mask |= (1 << 0);
+	if (qse_is_sck_valid(urs->handle[1])) urs->handle_mask |= (1 << 1);
+	if (qse_is_sck_valid(urs->handle[2])) urs->handle_mask |= (1 << 2);
+
+	urs->ctx = dc;
+	return 0;
+
+oops:
+	if (qse_is_sck_valid(urs->handle[0])) qse_close_sck (urs->handle[0]);
+	if (qse_is_sck_valid(urs->handle[1])) qse_close_sck (urs->handle[1]);
+	if (qse_is_sck_valid(urs->handle[2])) 
+	{
+		qse_close_sck (urs->handle[2]);
+	#if defined(AF_UNIX)
+		QSE_UNLINK (dc->unix_bind_addr.sun_path);
+	#endif
+	}
+	if (dc) qse_httpd_freemem (httpd, dc);
+	return -1;
+}
+
+static void urs_remove_tmr_tmout (qse_httpd_t* httpd, urs_req_t* req)
+{
+	if (req->tmr_tmout != QSE_TMR_INVALID_INDEX)
+	{
+		qse_httpd_remove_timer_event (httpd, req->tmr_tmout);
+		req->tmr_tmout = QSE_TMR_INVALID_INDEX;
+	}
+}
+
+static void urs_close (qse_httpd_t* httpd, qse_httpd_urs_t* urs)
+{
+	urs_ctx_t* dc = (urs_ctx_t*)urs->ctx;
+	qse_size_t i;
+
+	for (i = 0; i < QSE_COUNTOF(dc->reqs); i++)
+	{
+		urs_req_t* next_req;
+		while (dc->reqs[i])
+		{
+			next_req = dc->reqs[i]->next;
+			urs_remove_tmr_tmout (httpd, dc->reqs[i]);
+			qse_httpd_freemem (httpd, dc->reqs[i]);
+			dc->reqs[i] = next_req;
+			dc->req_count--;
+		}
+	}
+
+	QSE_ASSERT (dc->req_count == 0);
+
+	if (qse_is_sck_valid(urs->handle[0])) qse_close_sck (urs->handle[0]);
+	if (qse_is_sck_valid(urs->handle[1])) qse_close_sck (urs->handle[1]);
+	if (qse_is_sck_valid(urs->handle[2])) 
+	{
+		qse_close_sck (urs->handle[2]);
+	#if defined(AF_UNIX)
+		QSE_UNLINK (dc->unix_bind_addr.sun_path);
+	#endif
+	}
+	qse_httpd_freemem (httpd, urs->ctx);
+}
+
+
+static int urs_recv (qse_httpd_t* httpd, qse_httpd_urs_t* urs, qse_httpd_hnd_t handle)
+{
+	urs_ctx_t* dc = (urs_ctx_t*)urs->ctx;
+	/*httpd_xtn_t* httpd_xtn = GET_HTTPD_XTN(httpd);*/
+
+	qse_skad_t fromaddr;
+	qse_sck_len_t fromlen;
+
+	qse_uint16_t xid;
+	qse_ssize_t len, url_len;
+	urs_pkt_t* pkt;
+	urs_req_t* req;
+	qse_mchar_t* spc;
+
+/* TODO: use recvmsg with MSG_ERRQUEUE... set socket option IP_RECVERR... */
+	fromlen = QSE_SIZEOF(fromaddr);
+	len = recvfrom (handle, dc->rcvbuf, QSE_SIZEOF(dc->rcvbuf) - 1, 0, (struct sockaddr*)&fromaddr, &fromlen);
+
+/* TODO: check if fromaddr matches the dc->skad... */
+
+	pkt = (urs_pkt_t*)dc->rcvbuf;
+	if (len >= QSE_SIZEOF(urs_hdr_t))
+	{
+		pkt->hdr.pktlen = qse_ntoh16(pkt->hdr.pktlen);
+		if (len == pkt->hdr.pktlen)
+		{
+			url_len = pkt->hdr.pktlen - QSE_SIZEOF(urs_hdr_t);
+			xid = qse_ntoh16(pkt->hdr.seq) % QSE_COUNTOF(dc->reqs);
+
+			for (req = dc->reqs[xid]; req; req = req->next)
+			{
+				if (req->pkt->hdr.seq == pkt->hdr.seq && req->pkt->hdr.urlsum == pkt->hdr.urlsum)
+				{
+					/* null-terminate the url for easier processing */
+					pkt->url[url_len] = QSE_MT('\0');
+
+					/* drop trailers starting from the first space onwards */
+					spc = qse_mbschr (pkt->url, QSE_MT(' '));
+					if (spc) *spc = QSE_MT('\0');
+
+					urs_remove_tmr_tmout (httpd, req);
+					req->rewrite (httpd, req->pkt->url, pkt->url, req->ctx);
+
+					/* detach the request off dc->reqs */
+					if (req == dc->reqs[xid]) dc->reqs[xid] = req->next;
+					else req->prev->next = req->next;
+					if (req->next) req->next->prev = req->prev;
+
+					qse_httpd_freemem (httpd, req);
+					dc->req_count--;
+
+					break;
+				}
+			}
+		}
+	}
+
+	return 0;
+}
+
+static void tmr_urs_tmout_update (qse_tmr_t* tmr, qse_tmr_index_t old_index, qse_tmr_index_t new_index, qse_tmr_event_t* evt)
+{
+	urs_req_t* req = (urs_req_t*)evt->ctx;
+
+	QSE_ASSERT (req->tmr_tmout == old_index);
+	req->tmr_tmout = new_index;
+}
+
+static void tmr_urs_tmout_handle (qse_tmr_t* tmr, const qse_ntime_t* now, qse_tmr_event_t* evt)
+{
+	/* destory the unanswered request if timed out */
+
+	urs_req_t* req = (urs_req_t*)evt->ctx;
+	urs_ctx_t* dc = req->dc;
+	qse_uint16_t xid;
+
+	/* when this handler is called, the event should be removed from the timer */
+	QSE_ASSERT (req->tmr_tmout == QSE_TMR_INVALID_INDEX);
+
+	/* ---------------------------------------------------------------
+	 * resend 
+	 *---------------------------------------------------------------- */
+	if (req->urs_retries > 0)
+	{
+		/*httpd_xtn_t* httpd_xtn = GET_HTTPD_XTN(dc->httpd);*/
+		qse_tmr_event_t tmout_event;
+
+		QSE_MEMSET (&tmout_event, 0, QSE_SIZEOF(tmout_event));
+		qse_gettime (&tmout_event.when);
+		qse_add_ntime (&tmout_event.when, &req->urs_tmout, &tmout_event.when);
+		tmout_event.ctx = req;
+		tmout_event.handler = tmr_urs_tmout_handle;
+		tmout_event.updater = tmr_urs_tmout_update;
+
+		if (sendto (req->urs_socket, (void*)req->pkt, req->pktlen, 0, (struct sockaddr*)&req->urs_skad, req->urs_skadlen) != req->pktlen)
+		{
+			/* error. fall thru */
+			qse_httpd_seterrnum (dc->httpd, SKERR_TO_ERRNUM());
+
+			/* Unix datagram socket seems to fail with EAGAIN often 
+			 * even with increased SO_SNDBUF size. */
+			if (dc->httpd->errnum == QSE_HTTPD_EAGAIN && req->urs_retries > 1)
+			{
+				/* TODO: check writability of req->urs_socket instead of just retrying... */
+				goto send_ok;
+			}
+		}
+		else
+		{
+		send_ok:
+			QSE_ASSERT (tmr == dc->httpd->tmr);
+			if (qse_httpd_insert_timer_event (dc->httpd, &tmout_event, &req->tmr_tmout) >= 0)
+			{
+				req->urs_retries--;
+				return; /* resend ok */
+			}
+		}
+	}
+
+printf ("urs timed out....\n");
+	/* ---------------------------------------------------------------
+	 * timed out + no resend 
+	 *---------------------------------------------------------------- */
+	xid = req->seq % QSE_COUNTOF(dc->reqs);
+
+	/* detach the request off dc->reqs */
+	if (req == dc->reqs[xid]) dc->reqs[xid] = req->next;
+	else req->prev->next = req->next;
+	if (req->next) req->next->prev = req->prev;
+
+	/* urs timed out. report that name resolution failed */
+	req->rewrite (dc->httpd, req->pkt->url, QSE_NULL, req->ctx);
+
+	/* i don't cache the items that have timed out */
+	qse_httpd_freemem (dc->httpd, req);
+	dc->req_count--;
+}
+
+static int urs_send (qse_httpd_t* httpd, qse_httpd_urs_t* urs, const qse_mchar_t* url, qse_httpd_rewrite_t rewrite, const qse_httpd_urs_server_t* urs_server, void* ctx)
+{
+	urs_ctx_t* dc = (urs_ctx_t*)urs->ctx;
+	httpd_xtn_t* httpd_xtn = GET_HTTPD_XTN(httpd);
+
+	qse_uint16_t xid;
+	qse_uint32_t seq;
+	urs_req_t* req = QSE_NULL;
+	qse_size_t url_len;
+	qse_tmr_event_t tmout_event;
+
+	if (dc->req_count >= QSE_COUNTOF(dc->reqs))
+	{
+		/* too many pending requests */
+		qse_httpd_seterrnum (httpd, QSE_HTTPD_ENOBUF);
+		goto oops;
+	}
+
+	url_len = qse_mbslen(url);
+	if (url_len > URS_MAX_URL_LEN) /* TODO: change the limit */
+	{
+		qse_httpd_seterrnum (httpd, QSE_HTTPD_EINVAL);
+		goto oops;
+	}
+
+	seq = ((qse_uint32_t)dc->seq + 1) % URS_SEQ_RANGE_SIZE;
+	dc->seq = seq;
+
+	xid = seq % QSE_COUNTOF(dc->reqs); 
+
+	req = qse_httpd_callocmem (httpd, QSE_SIZEOF(*req) + QSE_SIZEOF(urs_hdr_t) + url_len + 1);
+	if (req == QSE_NULL) goto oops;
+
+	req->tmr_tmout = QSE_TMR_INVALID_INDEX;
+	req->seq = seq;
+	req->pkt = (urs_pkt_t*)(req + 1);
+	req->pktlen = QSE_SIZEOF(urs_hdr_t) + url_len;
+
+	req->pkt->hdr.seq = qse_hton16(seq);
+	req->pkt->hdr.pktlen = qse_hton16(req->pktlen);
+	req->pkt->hdr.urlsum = hash_string (url);
+	qse_mbscpy (req->pkt->url, url);
+
+	req->rewrite = rewrite;
+	req->ctx = ctx;
+
+	req->urs_retries = httpd_xtn->urs.retries;
+	req->urs_tmout = httpd_xtn->urs.tmout;
+
+	if (urs_server)
+	{
+		if (urs_server->retries >= 0) req->urs_retries = urs_server->retries;
+		if (urs_server->tmout.sec >= 0) req->urs_tmout = urs_server->tmout;
+
+		req->urs_skadlen = qse_nwadtoskad (&urs_server->nwad, &req->urs_skad);
+		if (req->urs_skadlen <= -1) goto default_urs_server;
+
+		switch (urs_server->nwad.type)
+		{
+			case QSE_NWAD_IN4:
+				req->urs_socket = urs->handle[0];
+				break;
+			case QSE_NWAD_IN6:
+				req->urs_socket = urs->handle[1];
+				break;
+			case QSE_NWAD_LOCAL:
+				req->urs_socket = urs->handle[2];
+				break;
+			default:
+				/* TODO: should it return failure with QSE_HTTPD_EINVAL? */
+				goto default_urs_server;
+		}
+	}
+	else
+	{
+	default_urs_server:
+		if (dc->skadlen >= 0)
+		{
+			/* the default url rewrite server address set in urs_open
+			 * is valid. */
+			req->urs_skad = dc->skad;
+			req->urs_skadlen = dc->skadlen;
+			req->urs_socket = dc->urs_socket;
+		}
+		else
+		{
+			qse_httpd_seterrnum (httpd, QSE_HTTPD_ENOURS);
+			goto oops;
+		}
+	}
+
+	QSE_MEMSET (&tmout_event, 0, QSE_SIZEOF(tmout_event));
+	qse_gettime (&tmout_event.when);
+	qse_add_ntime (&tmout_event.when, &req->urs_tmout, &tmout_event.when);
+	tmout_event.ctx = req;
+	tmout_event.handler = tmr_urs_tmout_handle;
+	tmout_event.updater = tmr_urs_tmout_update;
+	if (qse_httpd_insert_timer_event (httpd, &tmout_event, &req->tmr_tmout) <= -1) goto oops;
+
+/*
+  {
+  struct msghdr msg;
+	struct iovec iov;
+	QSE_MEMSET (&msg, 0, QSE_SIZEOF(msg));
+	msg.msg_name = &req->urs_skad;
+	msg.msg_namelen = req->urs_skadlen;
+	iov.iov_base = req->pkt;
+	iov.iov_len = req->pktlen;
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+	if (sendmsg (req->urs_socket, &msg, 0) != req->pktlen) 
+}
+*/
+
+	if (sendto (req->urs_socket, (void*)req->pkt, req->pktlen, 0, (struct sockaddr*)&req->urs_skad, req->urs_skadlen) != req->pktlen)
+	{
+		qse_httpd_seterrnum (httpd, SKERR_TO_ERRNUM());
+printf ("URS SENDTO FAILURE........................\n"); /* TODO: logging */
+
+		/* Unix datagram socket seems to fail with EAGAIN often 
+		 * even with increased SO_SNDBUF size. */
+		if (httpd->errnum == QSE_HTTPD_EAGAIN && req->urs_retries > 0)
+		{
+			/* TODO: check writability of req->urs_socket instead of just retrying... */
+			goto send_ok;
+		}
+
+		goto oops;
+	}
+
+send_ok:
+	req->dc = dc;
+
+	/* link the request to the front of the chain */
+	if (dc->reqs[xid]) dc->reqs[xid]->prev = req;
+	req->next = dc->reqs[xid];
+	dc->reqs[xid] = req;
+
+	/* increment the number of pending requests */
+	dc->req_count++;
+	return 0;
+
+oops:
+	if (req)
+	{
+		urs_remove_tmr_tmout (httpd, req);
+		qse_httpd_freemem (httpd, req);
+	}
+	return -1;
+}
+
+static int urs_prerewrite (qse_httpd_t* httpd, qse_httpd_client_t* client, qse_htre_t* req, const qse_mchar_t* host, qse_mchar_t** url)
+{
+	const qse_mchar_t* qpath;
+	int mtype;
+	const qse_mchar_t* mname;
+	const qse_mchar_t* quest;
+	const qse_mchar_t* qparam;
+	const qse_mchar_t* proto;
+
+	const qse_mchar_t* host_ptr = QSE_NULL;
+	qse_mchar_t cliaddrbuf[MAX_NWAD_TEXT_SIZE];
+	qse_size_t total_len;
+	qse_mchar_t* url_to_rewrite;
+
+	qpath = qse_htre_getqpath(req);
+	qparam = qse_htre_getqparam(req);
+	mtype = qse_htre_getqmethodtype(req);
+	mname = qse_htre_getqmethodname(req);
+
+	total_len = qse_mbslen(qpath) + qse_mbslen(mname);
+	if (qparam) 
+	{
+		quest = QSE_MT("?");
+		total_len = total_len + 1 + qse_mbslen(qparam);
+	}
+	else 
+	{
+		qparam = QSE_MT("");
+		quest = QSE_MT("");
+	}
+
+	if (host)
+	{
+		/* use the host name set explicitly by the caller */
+		host_ptr = host;
+		total_len += qse_mbslen(host_ptr);
+	}
+	else 
+	{
+		/* find the host name in the http header */
+		const qse_htre_hdrval_t* hosthv;
+		hosthv = qse_htre_getheaderval(req, QSE_MT("Host"));
+		if (hosthv)
+		{
+			/* the first host header only */
+			host_ptr = hosthv->ptr;
+			total_len += hosthv->len;
+		}
+	}
+
+	total_len += qse_nwadtombs (&client->remote_addr, cliaddrbuf, QSE_COUNTOF(cliaddrbuf), QSE_NWADTOMBS_ADDR);
+	total_len += 128; /* extra space */
+
+	url_to_rewrite = qse_httpd_allocmem (httpd, total_len);
+	if (url_to_rewrite == QSE_NULL) return -1;
+
+	if (mtype == QSE_HTTP_CONNECT || !host_ptr) 
+	{
+		host_ptr = QSE_MT("");
+		proto = QSE_MT("");
+	}
+	else if (client->status & QSE_HTTPD_CLIENT_SECURE)
+	{
+		proto = QSE_MT("https://");
+	}
+	else
+	{
+		proto = QSE_MT("http://");
+	}
+
+	/* URL client-ip/client-fqdn ident method  */
+	qse_mbsxfmt (url_to_rewrite, total_len, QSE_MT("%s%s%s%s%s %s/- - %s"), proto, host_ptr, qpath, quest, qparam, cliaddrbuf, mname);
+
+	*url = url_to_rewrite;
+	return 1;
+}

lib/http/httpd-task.c

@@ -0,0 +1,422 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "httpd.h"
+#include <qse/cmn/str.h>
+#include "../cmn/mem-prv.h"
+
+/* TODO:
+ * many functions in this file use qse_size_t.
+ * so the size data transfers is limited by this type.
+ * break this barrier... */
+
+/*------------------------------------------------------------------------*/
+
+static int task_main_disconnect (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	httpd->opt.scb.client.shutdown (httpd, client);
+	return 0;
+}
+
+qse_httpd_task_t* qse_httpd_entaskdisconnect (
+	qse_httpd_t* httpd, 
+	qse_httpd_client_t* client,
+	qse_httpd_task_t* pred)
+{
+	qse_httpd_task_t task;
+	
+	QSE_MEMSET (&task, 0, QSE_SIZEOF(task));
+	task.main = task_main_disconnect;
+
+	return qse_httpd_entask (httpd, client, pred, &task, 0);
+}
+
+/*------------------------------------------------------------------------*/
+
+/* TODO: send wide character string when QSE_CHAR_IS_WCHAR */
+
+/*------------------------------------------------------------------------*/
+
+typedef struct task_format_t task_format_t;
+struct task_format_t
+{
+	qse_mchar_t*       org;
+	const qse_mchar_t* ptr;
+	qse_size_t         left;
+};
+
+static int task_init_format (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_format_t* xtn = qse_httpd_gettaskxtn (httpd, task);
+
+	QSE_MEMCPY (xtn, task->ctx, QSE_SIZEOF(*xtn));
+	task->ctx = xtn;
+	return 0;
+}
+
+static void task_fini_format (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_format_t* ctx = (task_format_t*)task->ctx;
+	qse_httpd_freemem (httpd, ctx->org);
+}
+
+static int task_main_format (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	qse_ssize_t n;
+	qse_size_t count;
+	task_format_t* ctx = (task_format_t*)task->ctx;
+
+	count = MAX_SEND_SIZE;
+	if (count >= ctx->left) count = ctx->left;
+
+	httpd->errnum = QSE_HTTPD_ENOERR;
+	n = httpd->opt.scb.client.send (httpd, client, ctx->ptr, count);
+	if (n <= -1) 
+	{
+		if (httpd->errnum != QSE_HTTPD_EAGAIN) return -1;
+	}
+	else if (n > 0)
+	{
+		ctx->left -= n;
+		if (ctx->left <= 0) return 0;
+		ctx->ptr += n;
+	}
+
+	return 1; /* more work to do */
+}
+
+qse_httpd_task_t* qse_httpd_entaskformat (
+	qse_httpd_t* httpd,
+	qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred,
+	const qse_mchar_t* fmt, ...)
+{
+	qse_httpd_task_t task;
+	task_format_t data;
+
+	va_list ap;
+	qse_mchar_t* buf;
+	int bytes_req, l;
+
+	va_start (ap, fmt);
+	bytes_req = qse_mbsxvfmt (QSE_NULL, 0, fmt, ap);
+	va_end (ap);
+
+	buf = (qse_mchar_t*) qse_httpd_allocmem (
+		httpd, (bytes_req + 1) * QSE_SIZEOF(*buf));
+	if (buf == QSE_NULL) return QSE_NULL;
+
+	va_start (ap, fmt);
+	l = qse_mbsxvfmt (buf, bytes_req + 1, fmt, ap);
+	va_end (ap);
+
+	if (l != bytes_req) 
+	{
+		/* something got wrong ... */
+		qse_httpd_freemem (httpd, buf);
+		httpd->errnum = QSE_HTTPD_EINTERN;
+		return QSE_NULL;
+	}
+
+	QSE_MEMSET (&data, 0, QSE_SIZEOF(data));
+	data.org = buf;
+	data.ptr = buf;
+	data.left = l;
+
+	QSE_MEMSET (&task, 0, QSE_SIZEOF(task));
+	task.init = task_init_format;
+	task.fini = task_fini_format;
+	task.main = task_main_format;
+	task.ctx = &data;
+
+	return qse_httpd_entask (
+		httpd, client, pred, &task, QSE_SIZEOF(data));
+}
+
+/* TODO: send wide character string when QSE_CHAR_IS_WCHAR */
+
+/*------------------------------------------------------------------------*/
+
+
+qse_httpd_task_t* qse_httpd_entask_status (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred, int code, void* extra,
+	qse_http_method_t method, const qse_http_version_t* version, 
+	int keepalive)
+{
+	const qse_mchar_t* msg;
+
+	const qse_mchar_t* extrapre = QSE_MT(""); 
+	const qse_mchar_t* extrapst = QSE_MT("");
+	const qse_mchar_t* extraval = QSE_MT("");
+
+	qse_mchar_t text[1024]; /* TODO: make this buffer dynamic or scalable */
+
+	text[0] = QSE_MT('\0');
+	
+	msg = qse_httpstatustombs (code);
+	switch (code)
+	{
+		case 301: /* Moved Permanently */ 
+		case 302: /* Found */
+		case 303: /* See Other (since HTTP/1.1) */
+		case 307: /* Temporary Redirect (since HTTP/1.1) */
+		case 308: /* Permanent Redirect (Experimental RFC; RFC 7238) */
+		{
+			qse_httpd_rsrc_reloc_t* reloc;
+			reloc = (qse_httpd_rsrc_reloc_t*)extra;
+			extrapre = QSE_MT("Location: ");
+			extrapst = (reloc->flags & QSE_HTTPD_RSRC_RELOC_APPENDSLASH)? QSE_MT("/\r\n"): QSE_MT("\r\n");
+			extraval = reloc->target;
+			break;
+		}
+
+		case 304:
+		case 200:
+		case 201:
+		case 202:
+		case 203:
+		case 204:
+		case 205:
+		case 206:
+			/* nothing to do */
+			break;
+
+		default:
+			if (method != QSE_HTTP_HEAD &&
+			    httpd->opt.rcb.fmterr (httpd, client, code, text, QSE_COUNTOF(text)) <= -1) return QSE_NULL;
+
+			if (code == 401)
+			{
+				extrapre = QSE_MT("WWW-Authenticate: Basic realm=\"");
+				extrapst = QSE_MT("\"\r\n");
+				extraval = (const qse_mchar_t*)extra;
+			}
+			break;
+	}
+
+	return qse_httpd_entaskformat (
+		httpd, client, pred,
+		QSE_MT("HTTP/%d.%d %d %s\r\nServer: %s\r\nDate: %s\r\nConnection: %s\r\nContent-Type: text/html\r\nContent-Length: %u\r\n%s%s%s\r\n%s"),
+		version->major, version->minor, 
+		code, msg, qse_httpd_getname (httpd),
+		qse_httpd_fmtgmtimetobb (httpd, QSE_NULL, 0),
+		(keepalive? QSE_MT("keep-alive"): QSE_MT("close")),
+		(unsigned int)qse_mbslen(text), /* unsigned int should be large enough since text is small */
+		extrapre, extraval, extrapst, text);
+}
+/*------------------------------------------------------------------------*/
+
+qse_httpd_task_t* qse_httpd_entaskerrorwithmvk (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred, int code,
+	qse_http_method_t method,
+	const qse_http_version_t* version,
+	int keepalive)
+{
+	return qse_httpd_entask_status (httpd, client, pred, code, QSE_NULL, method, version, keepalive);
+}
+
+qse_httpd_task_t* qse_httpd_entaskerror (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred, int code, qse_htre_t* req)
+{
+	return qse_httpd_entask_status (
+		httpd, client, pred, code, QSE_NULL, 
+		qse_htre_getqmethodtype(req), 
+		qse_htre_getversion(req), 
+		(req->flags & QSE_HTRE_ATTR_KEEPALIVE)
+	);
+}
+
+/*------------------------------------------------------------------------*/
+qse_httpd_task_t* qse_httpd_entaskcontinue (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred, qse_htre_t* req)
+{
+	const qse_http_version_t* version = qse_htre_getversion(req);
+	return qse_httpd_entaskformat (
+		httpd, client, pred,
+		QSE_MT("HTTP/%d.%d 100 Continue\r\n\r\n"),
+		version->major, version->minor);
+}
+
+/*------------------------------------------------------------------------*/
+
+qse_httpd_task_t* qse_httpd_entaskauth (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred, const qse_mchar_t* realm, qse_htre_t* req)
+{
+	return qse_httpd_entask_status (
+		httpd, client, pred, 401, (void*)realm, 
+		qse_htre_getqmethodtype(req),
+		qse_htre_getversion(req), 
+		(req->flags & QSE_HTRE_ATTR_KEEPALIVE));
+}
+
+
+/*------------------------------------------------------------------------*/
+
+qse_httpd_task_t* qse_httpd_entaskreloc (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred, const qse_httpd_rsrc_reloc_t* reloc, qse_htre_t* req)
+{
+	int code;
+
+	if (reloc->flags & QSE_HTTPD_RSRC_RELOC_KEEPMETHOD)
+	{
+		code = (reloc->flags & QSE_HTTPD_RSRC_RELOC_PERMANENT)? 308: 307;
+	}
+	else
+	{
+		/* NOTE: 302 can be 303 for HTTP/1.1 */
+		code = (reloc->flags & QSE_HTTPD_RSRC_RELOC_PERMANENT)? 301: 302;
+	}
+
+	return qse_httpd_entask_status (
+		httpd, client, pred, code, (void*)reloc,
+		qse_htre_getqmethodtype(req), 
+		qse_htre_getversion(req), 
+		(req->flags & QSE_HTRE_ATTR_KEEPALIVE));
+}
+
+/*------------------------------------------------------------------------*/
+
+qse_httpd_task_t* qse_httpd_entask_nomod (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* pred, 
+	qse_http_method_t method, const qse_http_version_t* version, int keepalive)
+{
+	return qse_httpd_entask_status (
+		httpd, client, pred, 304, QSE_NULL, method, version, keepalive);
+}
+
+qse_httpd_task_t* qse_httpd_entasknomod (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred, qse_htre_t* req)
+{
+	return qse_httpd_entask_status (
+		httpd, client, pred, 304, QSE_NULL, 
+		qse_htre_getqmethodtype(req), 
+		qse_htre_getversion(req), 
+		(req->flags & QSE_HTRE_ATTR_KEEPALIVE));
+}
+
+/*------------------------------------------------------------------------*/
+
+qse_httpd_task_t* qse_httpd_entaskallow (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred, const qse_mchar_t* allow, qse_htre_t* req)
+{
+	int code = 200;
+	const qse_mchar_t* msg;
+	const qse_http_version_t* version;
+	int keepalive;
+
+	msg = qse_httpstatustombs (code);
+	version = qse_htre_getversion(req);
+	keepalive = (req->flags & QSE_HTRE_ATTR_KEEPALIVE);
+	return qse_httpd_entaskformat (
+		httpd, client, pred,
+		QSE_MT("HTTP/%d.%d %d %s\r\nServer: %s\r\nDate: %s\r\nConnection: %s\r\nAllow: %s\r\nContent-Length: 0\r\n\r\n"),
+		version->major, version->minor, 
+		code, msg, qse_httpd_getname (httpd),
+		qse_httpd_fmtgmtimetobb (httpd, QSE_NULL, 0),
+		(keepalive? QSE_MT("keep-alive"): QSE_MT("close")),
+		allow
+	);
+}
+
+/*------------------------------------------------------------------------*/
+
+#if 0
+qse_httpd_task_t* qse_httpd_entaskconnect (
+	qse_httpd_t* httpd,
+	qse_httpd_client_t* client,
+	qse_httpd_task_t* pred, 
+	const qse_nwad_t* nwad,
+	qse_htre_t* req)
+{
+	return -1;
+}
+#endif
+
+
+qse_httpd_task_t* qse_httpd_entaskrsrc (
+	qse_httpd_t* httpd,
+	qse_httpd_client_t* client,
+	qse_httpd_task_t* pred, 
+	qse_httpd_rsrc_t* rsrc,
+	qse_htre_t* req)
+{
+	qse_httpd_task_t* task;
+
+	switch (rsrc->type)
+	{
+		case QSE_HTTPD_RSRC_AUTH:
+			task = qse_httpd_entaskauth (httpd, client, pred, rsrc->u.auth.realm, req);
+			break;
+
+		case QSE_HTTPD_RSRC_CGI:
+			task = qse_httpd_entaskcgi (httpd, client, pred, &rsrc->u.cgi, req);
+			break;
+
+		case QSE_HTTPD_RSRC_DIR:
+			task = qse_httpd_entaskdir (httpd, client, pred, &rsrc->u.dir, req);
+			break;
+
+		case QSE_HTTPD_RSRC_ERROR:
+			task = qse_httpd_entaskerror (httpd, client, pred, rsrc->u.error.code, req);
+			break;
+
+		case QSE_HTTPD_RSRC_FILE:
+			task = qse_httpd_entaskfile (httpd, client, pred, rsrc->u.file.path, rsrc->u.file.mime, req);
+			break;
+	
+		case QSE_HTTPD_RSRC_PROXY:
+			task = qse_httpd_entaskproxy (httpd, client, pred, &rsrc->u.proxy, req);
+			break;
+
+		case QSE_HTTPD_RSRC_RELOC:
+			task = qse_httpd_entaskreloc (httpd, client, pred, &rsrc->u.reloc, req);
+			break;
+
+		case QSE_HTTPD_RSRC_TEXT:
+			task = qse_httpd_entasktext (httpd, client, pred, rsrc->u.text.ptr, rsrc->u.text.mime, req);
+			break;
+
+		default:
+			qse_httpd_discardcontent (httpd, req);
+			task = QSE_NULL;
+			httpd->errnum = QSE_HTTPD_EINVAL;
+			break;
+	}
+
+	return task;
+}

lib/http/httpd-text.c

@@ -0,0 +1,204 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "httpd.h"
+#include "../cmn/mem-prv.h"
+#include <qse/cmn/fmt.h>
+
+typedef struct task_text_t task_text_t;
+struct task_text_t
+{
+	const qse_mchar_t* ptr;
+	qse_size_t         left;
+};
+
+static int task_init_text (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	task_text_t* xtn = qse_httpd_gettaskxtn (httpd, task);
+
+	QSE_MEMCPY (xtn, task->ctx, QSE_SIZEOF(*xtn));
+	QSE_MEMCPY (xtn + 1, xtn->ptr, xtn->left);
+	xtn->ptr = (qse_mchar_t*)(xtn + 1);
+
+	task->ctx = xtn;
+	return 0;
+}
+
+static int task_main_text (
+	qse_httpd_t* httpd, qse_httpd_client_t* client, qse_httpd_task_t* task)
+{
+	qse_ssize_t n;
+	qse_size_t count;
+	task_text_t* ctx = (task_text_t*)task->ctx;
+
+	count = MAX_SEND_SIZE;
+	if (count >= ctx->left) count = ctx->left;
+
+/* TODO: do i need to add code to skip this send if count is 0? */
+	httpd->errnum = QSE_HTTPD_ENOERR;
+	n = httpd->opt.scb.client.send (httpd, client, ctx->ptr, count);
+	if (n <= -1) 
+	{
+		if (httpd->errnum != QSE_HTTPD_EAGAIN) return -1;
+	}
+	else if (n > 0)
+	{
+		ctx->left -= n;
+		if (ctx->left <= 0) return 0;
+		ctx->ptr += n;
+	}
+
+	return 1; /* more work to do */
+}
+
+qse_httpd_task_t* qse_httpd_entasktextwithmvk (
+	qse_httpd_t* httpd,
+	qse_httpd_client_t* client,
+	qse_httpd_task_t* pred, 
+	const qse_mchar_t* text,
+	const qse_mchar_t* mime,
+	qse_http_method_t method,
+	const qse_http_version_t* version,
+	int keepalive)
+{
+	qse_size_t tlen;
+	qse_mchar_t b_tlen[64];
+
+	qse_httpd_task_t task;
+	task_text_t data;
+
+	switch (method)
+	{
+		case QSE_HTTP_HEAD:
+			tlen = 0;
+			break;
+
+		case QSE_HTTP_GET:
+		case QSE_HTTP_POST:
+			tlen = qse_mbslen(text);
+			break;
+
+		default:
+			/* Method not allowed */
+			return qse_httpd_entaskerrorwithmvk (httpd, client, pred, 405, method, version, keepalive);
+	}
+
+	qse_fmtuintmaxtombs (b_tlen, QSE_COUNTOF(b_tlen), tlen, 10, -1, QSE_MT('\0'), QSE_NULL);
+	pred = qse_httpd_entaskformat (
+		httpd, client, pred,
+		QSE_MT("HTTP/%d.%d 200 OK\r\nServer: %s\r\nDate: %s\r\nConnection: %s\r\nContent-Type: %s\r\nContent-Length: %s\r\n\r\n"),
+		version->major, version->minor,
+		qse_httpd_getname (httpd),
+		qse_httpd_fmtgmtimetobb (httpd, QSE_NULL, 0),
+		(keepalive? QSE_MT("keep-alive"): QSE_MT("close")),
+		mime, b_tlen
+	);
+	if (pred == QSE_NULL) return QSE_NULL;
+
+	QSE_MEMSET (&data, 0, QSE_SIZEOF(data));
+	data.ptr = text;
+	data.left = tlen;
+
+	QSE_MEMSET (&task, 0, QSE_SIZEOF(task));
+	task.init = task_init_text;
+	task.main = task_main_text;
+	task.ctx = &data;
+
+	return qse_httpd_entask (httpd, client, pred, &task, QSE_SIZEOF(data) + data.left);
+}
+
+qse_httpd_task_t* qse_httpd_entasktext (
+	qse_httpd_t* httpd,
+	qse_httpd_client_t* client,
+	qse_httpd_task_t* pred, 
+	const qse_mchar_t* text,
+	const qse_mchar_t* mime,
+	qse_htre_t* req)
+{
+	qse_http_method_t method;
+	qse_http_version_t* version;
+
+	
+	method = qse_htre_getqmethodtype (req);
+	version = qse_htre_getversion (req);
+
+	qse_htre_discardcontent (req);
+	return qse_httpd_entasktextwithmvk (httpd, client, pred, text, mime, method, version, (req->flags & QSE_HTRE_ATTR_KEEPALIVE));
+
+#if 0
+	qse_size_t tlen;
+	qse_mchar_t b_tlen[64];
+	qse_http_method_t method;
+	qse_http_version_t* version;
+
+	qse_httpd_task_t task;
+	task_text_t data;
+
+	method = qse_htre_getqmethodtype (req);
+	version = qse_htre_getversion (req);
+
+	qse_htre_discardcontent (req);
+	switch (method)
+	{
+		case QSE_HTTP_HEAD:
+			tlen = 0;
+			break;
+
+		case QSE_HTTP_GET:
+		case QSE_HTTP_POST:
+			tlen = qse_mbslen(text);
+			break;
+
+		default:
+			/* Method not allowed */
+			return qse_httpd_entaskerror (httpd, client, pred, 405, req);
+	}
+
+	qse_fmtuintmaxtombs (b_tlen, QSE_COUNTOF(b_tlen), tlen, 10, -1, QSE_MT('\0'), QSE_NULL);
+	pred = qse_httpd_entaskformat (
+		httpd, client, pred,
+		QSE_MT("HTTP/%d.%d 200 OK\r\nServer: %s\r\nDate: %s\r\nConnection: %s\r\nContent-Type: %s\r\nContent-Length: %s\r\n\r\n"),
+		version->major, version->minor,
+		qse_httpd_getname (httpd),
+		qse_httpd_fmtgmtimetobb (httpd, QSE_NULL, 0),
+		((req->flags & QSE_HTRE_ATTR_KEEPALIVE)? QSE_MT("keep-alive"): QSE_MT("close")),
+		mime, b_tlen
+	);
+	if (pred == QSE_NULL) return QSE_NULL;
+
+	QSE_MEMSET (&data, 0, QSE_SIZEOF(data));
+	data.ptr = text;
+	data.left = tlen;
+
+	QSE_MEMSET (&task, 0, QSE_SIZEOF(task));
+	task.init = task_init_text;
+	task.main = task_main_text;
+	task.ctx = &data;
+
+	return qse_httpd_entask (httpd, client, pred, &task, QSE_SIZEOF(data) + data.left);
+#endif
+}

lib/http/httpd.h

@@ -0,0 +1,220 @@
+/*
+ * $Id$
+ * 
+    Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _QSE_LIB_HTTP_HTTPD_H_
+#define _QSE_LIB_HTTP_HTTPD_H_
+
+/* private header file for httpd */
+
+#include <qse/http/httpd.h>
+
+#if defined(NDEBUG)
+	/* To include debugging messages while NDEBUG is set,
+	 * you can define QSE_HTTPD_DEBUG externally in CFLAGS or something.
+	 */
+#else
+	/* debugging mode */
+#	define QSE_HTTPD_DEBUG 1
+#endif
+
+#if defined(QSE_HTTPD_DEBUG)
+#	include <qse/si/sio.h>
+#	include <qse/cmn/path.h>
+#	define HTTPD_DBGOUT0(fmt) qse_putmbsf("%06d %-20hs " fmt, (int)__LINE__, qse_mbsbasename(__FILE__))
+#	define HTTPD_DBGOUT1(fmt,a1) qse_putmbsf("%06d %-20hs " fmt, (int)__LINE__, qse_mbsbasename(__FILE__), (a1))
+#	define HTTPD_DBGOUT2(fmt,a1,a2) qse_putmbsf("%06d %-20hs " fmt, (int)__LINE__, qse_mbsbasename(__FILE__), (a1), (a2))
+#	define HTTPD_DBGOUT3(fmt,a1,a2,a3) qse_putmbsf("%06d %-20hs " fmt, (int)__LINE__, qse_mbsbasename(__FILE__), (a1), (a2), (a3))
+#	define HTTPD_DBGOUT4(fmt,a1,a2,a3,a4) qse_putmbsf("%06d %-20hs " fmt, (int)__LINE__, qse_mbsbasename(__FILE__), (a1), (a2), (a3), (a4))
+#	define HTTPD_DBGOUT5(fmt,a1,a2,a3,a4,a5) qse_putmbsf("%06d %-20hs " fmt, (int)__LINE__, qse_mbsbasename(__FILE__), (a1), (a2), (a3), (a4), (a5))
+#else
+#	define HTTPD_DBGOUT0(fmt)
+#	define HTTPD_DBGOUT1(fmt,a1)
+#	define HTTPD_DBGOUT2(fmt,a1,a2)
+#	define HTTPD_DBGOUT3(fmt,a1,a2,a3)
+#	define HTTPD_DBGOUT4(fmt,a1,a2,a3,a4)
+#	define HTTPD_DBGOUT5(fmt,a1,a2,a3,a4,a5)
+#endif
+
+#define QSE_HTTPD_DEFAULT_PORT        80
+#define QSE_HTTPD_DEFAULT_SECURE_PORT 443
+
+
+struct qse_httpd_t
+{
+	QSE_HTTPD_HDR;
+	qse_httpd_errnum_t errnum;
+	qse_httpd_ecb_t* ecb; /* event callbacks */
+	qse_tmr_t* tmr;
+
+	struct
+	{
+		int trait;
+		qse_ntime_t tmout; /* poll timeout */
+		qse_ntime_t idle_limit; 
+		qse_cstr_t mod[2]; /* module prefix and postfix */
+		qse_httpd_scb_t scb; /* system callbacks */
+		qse_httpd_rcb_t rcb; /* request callbacks */
+	} opt;
+
+	int stopreq: 1;
+	int impedereq: 1;
+	int dnsactive: 1;
+	int ursactive: 1;
+
+	qse_mchar_t sname[128]; /* server name for the server header */
+	qse_mchar_t gtbuf[10][64]; /* GMT time buffers */
+
+	qse_httpd_mod_t* modlist;
+
+	struct
+	{
+		struct
+		{
+			qse_httpd_client_t* head;
+			qse_httpd_client_t* tail;
+			qse_size_t count;
+		} list;
+
+		struct
+		{
+			qse_httpd_client_t* head;
+			qse_httpd_client_t* tail;
+		} tasked;
+
+		qse_httpd_client_t* bad;
+	} client;
+
+	struct
+	{
+		struct
+		{
+			qse_httpd_server_t* head;
+			qse_httpd_server_t* tail;
+		} list;
+		qse_size_t          navail;
+		qse_size_t          nactive;
+	} server;
+
+	void* mux;
+	qse_httpd_dns_t dns;
+	qse_httpd_urs_t urs;
+};
+
+/* qse_httpd_real_task_t is a private type to hide some private fields
+ * from being exposed by qse_httpd_task_t. 
+ */
+typedef struct qse_httpd_real_task_t qse_httpd_real_task_t;
+
+struct qse_httpd_real_task_t
+{
+	qse_httpd_task_t core;
+	qse_httpd_real_task_t* prev;
+	qse_httpd_real_task_t* next;
+};
+
+#define MAX_SEND_SIZE (4096 * 4)
+#define MAX_RECV_SIZE (4096 * 2)
+
+#define MAX_NWAD_TEXT_SIZE 96
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+extern qse_http_version_t qse_http_v11;
+
+int qse_httpd_init (
+	qse_httpd_t* httpd,
+	qse_mmgr_t*  mmgr
+);
+
+void qse_httpd_fini (
+	qse_httpd_t* httpd
+);
+
+qse_httpd_task_t* qse_httpd_entask_status (
+	qse_httpd_t* httpd,
+	qse_httpd_client_t* client, 
+	qse_httpd_task_t* pred,
+	int code,
+	void* extra,
+	qse_http_method_t method,
+	const qse_http_version_t* version, 
+	int keepalive
+);
+
+qse_httpd_task_t* qse_httpd_entask_nomod (
+	qse_httpd_t* httpd,
+	qse_httpd_client_t* client,
+	qse_httpd_task_t* pred,
+	qse_http_method_t method,
+	const qse_http_version_t* version,
+	int keepalive
+);
+
+int qse_httpd_activatetasktrigger (
+	qse_httpd_t* httpd,
+	qse_httpd_client_t* client,
+	qse_httpd_task_t* task
+);
+
+int qse_httpd_inactivatetasktrigger (
+	qse_httpd_t* httpd,
+	qse_httpd_client_t* client,
+	qse_httpd_task_t* task
+);
+
+int qse_httpd_insert_timer_event (
+	qse_httpd_t*           httpd,
+	const qse_tmr_event_t* event,
+	qse_tmr_index_t*       index
+);
+
+void qse_httpd_remove_timer_event (
+	qse_httpd_t*     httpd,
+	qse_tmr_index_t  index
+);
+
+qse_httpd_peer_t* qse_httpd_cacheproxypeer (
+	qse_httpd_t*        httpd,
+	qse_httpd_client_t* client,
+	qse_httpd_peer_t*   tmpl
+);
+
+qse_httpd_peer_t* qse_httpd_decacheproxypeer (
+	qse_httpd_t*        httpd,
+	qse_httpd_client_t* client, 
+	const qse_nwad_t*   nwad,
+	const qse_nwad_t*   local,
+	int                 secure
+);
+
+#if defined(__cplusplus)
+}
+#endif
+
+
+#endif

lib/http/upxd.c

@@ -0,0 +1,586 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "upxd.h"
+#include <qse/cmn/str.h>
+
+static void disable_all_servers (qse_upxd_t* upxd);
+static void free_all_servers (qse_upxd_t* upxd);
+static qse_upxd_server_session_t* find_server_session (
+	qse_upxd_t* upxd, qse_upxd_server_t* server, qse_nwad_t* from);
+static void release_session (
+	qse_upxd_t* upxd, qse_upxd_server_session_t* session);
+
+
+qse_upxd_t* qse_upxd_open (qse_mmgr_t* mmgr, qse_size_t xtnsize)
+{
+	qse_upxd_t* upxd;
+
+	upxd = (qse_upxd_t*) QSE_MMGR_ALLOC (
+		mmgr, QSE_SIZEOF(*upxd) + xtnsize
+	);
+	if (upxd == QSE_NULL) return QSE_NULL;
+
+	if (qse_upxd_init (upxd, mmgr) <= -1)
+	{
+		QSE_MMGR_FREE (mmgr, upxd);
+		return QSE_NULL;
+	}
+
+	return upxd;
+}
+
+void qse_upxd_close (qse_upxd_t* upxd)
+{
+	qse_upxd_fini (upxd);
+	QSE_MMGR_FREE (upxd->mmgr, upxd);
+}
+
+int qse_upxd_init (qse_upxd_t* upxd, qse_mmgr_t* mmgr)
+{
+	QSE_MEMSET (upxd, 0, QSE_SIZEOF(*upxd));
+	upxd->mmgr = mmgr;
+	return 0;
+}
+
+void qse_upxd_fini (qse_upxd_t* upxd)
+{
+	if (upxd->server.nactive > 0) disable_all_servers (upxd);
+	
+	if (upxd->mux) 
+	{
+		upxd->cbs->mux.close (upxd, upxd->mux);
+		upxd->mux = QSE_NULL;
+	}
+	
+	free_all_servers (upxd);
+}
+
+qse_mmgr_t* qse_upxd_getmmgr (qse_upxd_t* upxd)
+{
+	return upxd->mmgr;
+}
+
+void* qse_upxd_getxtn (qse_upxd_t* upxd)
+{
+	return QSE_XTN (upxd);
+}
+
+qse_upxd_errnum_t qse_upxd_geterrnum (qse_upxd_t* upxd)
+{
+	return upxd->errnum;
+}
+
+void qse_upxd_seterrnum (qse_upxd_t* upxd, qse_upxd_errnum_t errnum)
+{
+	upxd->errnum = errnum;
+}
+
+QSE_INLINE void* qse_upxd_allocmem (qse_upxd_t* upxd, qse_size_t size)
+{
+	void* ptr = QSE_MMGR_ALLOC (upxd->mmgr, size);
+	if (ptr == QSE_NULL) upxd->errnum = QSE_UPXD_ENOMEM;
+	return ptr;
+}
+
+QSE_INLINE void* qse_upxd_reallocmem (
+	qse_upxd_t* upxd, void* ptr, qse_size_t size)
+{
+	void* nptr = QSE_MMGR_REALLOC (upxd->mmgr, ptr, size);
+	if (nptr == QSE_NULL) upxd->errnum = QSE_UPXD_ENOMEM;
+	return nptr;
+}
+
+QSE_INLINE void qse_upxd_freemem (qse_upxd_t* upxd, void* ptr)
+{
+	QSE_MMGR_FREE (upxd->mmgr, ptr);
+}
+
+
+static int perform_session_task (
+	qse_upxd_t* upxd, void* mux, qse_upxd_hnd_t handle, void* cbarg)
+{
+	qse_upxd_server_session_t* session;
+	qse_upxd_server_t* server;
+	qse_ssize_t n;
+
+	session = (qse_upxd_server_session_t*)cbarg;
+	server = session->inner.server;
+
+	qse_gettime (&session->modified);
+
+	/* this handler should set the 'from' field of server->scok */
+	n = upxd->cbs->sock.recv (
+		upxd, &session->peer, upxd->rbuf, QSE_SIZEOF(upxd->rbuf));
+	if (n <= -1)
+	{
+		upxd->cbs->session.error (upxd, &session->inner);
+		release_session (upxd, session);
+		return -1;
+	}
+
+	/* TODO: inspect if session->inner.to matches session->sock.from.
+	         drop it if they don't match if a certain option (QSE_UPXD_STRICT)
+			 is set??? */
+
+	/* send the peer's packet back to the client */ 
+	server->local.to = session->inner.client;
+	n = upxd->cbs->sock.send (upxd, &server->local, upxd->rbuf, n);
+	if (n <= -1)
+	{
+		upxd->cbs->session.error (upxd, &session->inner);
+		release_session (upxd, session);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int perform_server_task (
+	qse_upxd_t* upxd, void* mux, qse_upxd_hnd_t handle, void* cbarg)
+{
+	qse_upxd_server_t* server;
+	qse_upxd_server_session_t* session;
+	qse_ssize_t n;
+
+	server = (qse_upxd_server_t*)cbarg;
+
+	/* this handler should set the 'from' field of server->scok */
+	n = upxd->cbs->sock.recv (
+		upxd, &server->local, upxd->rbuf, QSE_SIZEOF(upxd->rbuf));
+	if (n <= -1) return -1;
+
+	/* get the existing session or create a new session based on
+	 * server->local->from */
+	session = find_server_session (upxd, server, &server->local.from);
+	if (session == QSE_NULL)
+	{
+		qse_upxd_session_t interim;
+		QSE_MEMSET (&interim, 0, QSE_SIZEOF(interim));
+		interim.client = server->local.from;
+		upxd->cbs->session.error (upxd, &interim);
+		return -1;
+	}
+
+	n = upxd->cbs->sock.send (upxd, &session->peer, upxd->rbuf, n);
+	if (n <= -1)
+	{
+		upxd->cbs->session.error (upxd, &session->inner);
+		release_session (upxd, session);
+		return -1;
+	}
+
+	return 0;
+}
+
+static qse_upxd_server_session_t* find_server_session (
+	qse_upxd_t* upxd, qse_upxd_server_t* server, qse_nwad_t* from)
+{
+	qse_upxd_server_session_t* session;
+
+	/* TODO: make it indexable or hashable with 'from'
+	 *       don't perform linear search */
+	/* find an existing session made for the source address 'from' */
+	for (session = server->session.list; session; session = session->next)
+	{
+		if (QSE_MEMCMP (&session->inner.client, from, QSE_SIZEOF(*from)) == 0)
+		{
+			qse_gettime (&session->modified);
+			return session;
+		}
+	}
+
+	/* there is no session found for the source address 'from'.
+	 * let's create a new session. */
+	session = qse_upxd_allocmem (upxd, QSE_SIZEOF(*session));
+	if (session == QSE_NULL) return QSE_NULL;
+
+	QSE_MEMSET (session, 0, QSE_SIZEOF(*session));
+
+	if (qse_gettime (&session->created) <= -1)
+	{
+		qse_upxd_freemem (upxd, session);
+		upxd->errnum = QSE_UPXD_ESYSERR;
+		return QSE_NULL;
+	}
+	session->modified = session->created;
+	
+	session->inner.server = server;
+	session->inner.client = *from;
+
+	/* set the default dormancy */
+	session->inner.config.dormancy.sec = QSE_UPXD_SESSION_DORMANCY;
+	session->inner.config.dormancy.nsec = 0;
+
+	/* call the configurationc callback for configuration data */
+	if (upxd->cbs->session.config (upxd, &session->inner) <= -1)
+	{
+		qse_upxd_freemem (upxd, session);
+		return QSE_NULL;
+	}
+
+	/* set up the peer socket with the configuration data */ 
+	session->peer.bind = session->inner.config.bind;
+	session->peer.to = session->inner.config.peer;
+	if (session->inner.config.dev[0] != QSE_T('\0'))
+		session->peer.dev = session->inner.config.dev;
+
+	if (upxd->cbs->sock.open (upxd, &session->peer) <= -1)
+	{
+		qse_upxd_freemem (upxd, session);
+		return QSE_NULL;
+	}
+
+	if (upxd->cbs->mux.addhnd (
+		upxd, upxd->mux, session->peer.handle,
+		perform_session_task, session) <= -1)
+	{
+		upxd->cbs->sock.close (upxd, &session->peer);
+		qse_upxd_freemem (upxd, session);
+		return QSE_NULL;
+	}
+
+	/* insert the session into the head of the session list */
+	if (server->session.list)
+		server->session.list->prev = session;
+	session->next = server->session.list;
+	server->session.list = session;
+
+	return session;
+}
+
+static void release_session (
+	qse_upxd_t* upxd, qse_upxd_server_session_t* session)
+{
+	qse_upxd_server_t* server;
+
+	server = session->inner.server;
+	QSE_ASSERT (server != QSE_NULL);
+
+	upxd->cbs->mux.delhnd (upxd, upxd->mux, session->peer.handle);
+	upxd->cbs->sock.close (upxd, &session->peer);
+
+	/* remove the session from the session list */
+	if (session->next) session->next->prev = session->prev;
+	if (session->prev) session->prev->next = session->next;
+	else server->session.list = session->next;
+
+	/* destroy the session */
+	qse_upxd_freemem (upxd, session);
+}
+
+static int enable_server (qse_upxd_t* upxd, qse_upxd_server_t* server)
+{
+	QSE_ASSERT (upxd->cbs != QSE_NULL);
+	QSE_ASSERT (!(server->flags & QSE_UPXD_SERVER_ENABLED));
+	
+	if (upxd->cbs->sock.open (upxd, &server->local) <= -1)
+	{
+		return -1;
+	}
+
+	if (upxd->cbs->mux.addhnd (
+		upxd, upxd->mux, server->local.handle,
+		perform_server_task, server) <= -1)
+	{
+		upxd->cbs->sock.close (upxd, &server->local);
+		return -1;
+	}
+
+	server->flags |= QSE_UPXD_SERVER_ENABLED;
+	upxd->server.nactive++;
+	return 0;
+}
+
+static void disable_server (qse_upxd_t* upxd, qse_upxd_server_t* server)
+{
+	qse_upxd_server_session_t* session;
+
+	QSE_ASSERT (upxd->cbs != QSE_NULL);
+	QSE_ASSERT (server->flags & QSE_UPXD_SERVER_ENABLED);
+
+	session = server->session.list;
+	while (session)
+	{
+		qse_upxd_server_session_t* next = session->next;
+		release_session (upxd, session);
+		session = next;
+	}
+
+	upxd->cbs->mux.delhnd (upxd, upxd->mux, server->local.handle);
+	upxd->cbs->sock.close (upxd, &server->local);
+
+	server->flags &= ~QSE_UPXD_SERVER_ENABLED;
+	upxd->server.nactive--;
+}
+
+static void enable_all_servers (qse_upxd_t* upxd)
+{
+	qse_upxd_server_t* server;
+
+	for (server = upxd->server.list; server; server = server->next)
+	{
+		if (!(server->flags & QSE_UPXD_SERVER_ENABLED))
+		{
+			enable_server (upxd, server);
+		}
+	}
+}
+
+static void disable_all_servers (qse_upxd_t* upxd)
+{
+	qse_upxd_server_t* server;
+
+	server = upxd->server.list;
+	while (server)
+	{
+		if (server->flags & QSE_UPXD_SERVER_ENABLED)
+			disable_server (upxd, server);
+
+		server = server->next;
+	}
+}
+
+static void free_all_servers (qse_upxd_t* upxd)
+{
+	qse_upxd_server_t* server;
+	qse_upxd_server_t* next;
+
+	server = upxd->server.list;
+	while (server)
+	{
+		next = server->next;
+		QSE_MMGR_FREE (upxd->mmgr, server);
+		server = next;
+	}
+	upxd->server.list = QSE_NULL;
+}
+
+qse_upxd_server_t* qse_upxd_addserver (
+	qse_upxd_t* upxd, const qse_nwad_t* nwad, const qse_char_t* dev)
+{
+	qse_upxd_server_t* server;
+
+	if (dev && qse_strlen(dev) >= QSE_COUNTOF(server->dev))
+	{
+		upxd->errnum = QSE_UPXD_EINVAL;
+		return QSE_NULL;
+	}
+
+	server = QSE_MMGR_ALLOC (upxd->mmgr, QSE_SIZEOF(*server));
+	if (server == QSE_NULL)
+	{
+		upxd->errnum = QSE_UPXD_ENOMEM;
+		return QSE_NULL;
+	}
+
+	QSE_MEMSET (server, 0, QSE_SIZEOF(*server));
+	if (dev)
+	{
+		qse_strxcpy (server->dev, QSE_COUNTOF(server->dev), dev);
+		server->local.dev = server->dev;
+	}
+	server->local.bind = *nwad;
+
+	/* chain it to the head of the list */
+	if (upxd->server.list)
+		upxd->server.list->prev = server;
+	server->next = upxd->server.list;
+	upxd->server.list = server;
+
+	return server;
+}
+
+void qse_upxd_delserver (
+	qse_upxd_t* upxd, qse_upxd_server_t* server)
+{
+	if (server->flags & QSE_UPXD_SERVER_ENABLED)
+		disable_server (upxd, server);
+
+	/* unchain the session from the list */
+	if (server->next) server->next->prev = server->prev;
+	if (server->prev) server->prev->next = server->next;
+	else upxd->server.list = server->next;
+}
+
+void* qse_upxd_getserverctx (
+	qse_upxd_t* upxd, qse_upxd_server_t* server)
+{
+	return server->ctx;
+}
+
+void qse_upxd_setserverctx (
+	qse_upxd_t* upxd, qse_upxd_server_t* server, void* ctx)
+{
+	server->ctx = ctx;
+}
+
+qse_upxd_cbs_t* qse_upxd_getcbs (qse_upxd_t* upxd)
+{
+	return upxd->cbs;
+}
+
+void qse_upxd_setcbs (qse_upxd_t* upxd, qse_upxd_cbs_t* cbs)
+{
+	upxd->cbs = cbs;
+}
+
+static QSE_INLINE void purge_idle_sessions_in_server (
+	qse_upxd_t* upxd, qse_upxd_server_t* server)
+{
+	qse_upxd_server_session_t* session;
+	qse_upxd_server_session_t* next;
+	qse_ntime_t now;
+
+	qse_gettime (&now);
+
+	session = server->session.list;
+	while (session)
+	{
+		next = session->next;
+
+		if (session->inner.config.dormancy.sec > 0 &&
+		    now.sec > session->modified.sec &&
+		    now.sec - session->modified.sec > session->inner.config.dormancy.sec)
+		{
+			release_session (upxd, session);
+		}
+
+		session = next;
+	}
+}
+
+static void purge_idle_sessions (qse_upxd_t* upxd)
+{
+	qse_upxd_server_t* server;
+
+	for (server = upxd->server.list; server; server = server->next)
+	{
+		if (server->flags & QSE_UPXD_SERVER_ENABLED)
+		{
+			purge_idle_sessions_in_server (upxd, server);
+		}
+	}
+}
+
+int qse_upxd_loop (qse_upxd_t* upxd, qse_ntime_t timeout)
+{
+	int retv = -1;
+
+	QSE_ASSERTX (upxd->cbs != QSE_NULL,
+		"Call qse_upxd_setcbs() before calling qse_upxd_loop()");
+
+	if (upxd->cbs == QSE_NULL)
+	{
+		upxd->errnum = QSE_UPXD_EINVAL;
+		goto oops;
+	}
+
+	if (upxd->mux)
+	{
+		/* close the mutiplexer if it's open */
+		upxd->cbs->mux.close (upxd, upxd->mux);
+		upxd->mux = QSE_NULL;
+	}
+
+	upxd->stopreq = 0;
+	upxd->mux = upxd->cbs->	mux.open (upxd);
+	if (upxd->mux == QSE_NULL) goto oops;
+
+	enable_all_servers (upxd);
+	
+	while (!upxd->stopreq)
+	{
+		int count;
+
+		count = upxd->cbs->mux.poll (upxd, upxd->mux, timeout);
+		if (count <= -1)
+		{
+			/* TODO: anything? */
+		}
+			
+		purge_idle_sessions (upxd);
+		enable_all_servers (upxd);
+	}
+
+	retv = 0;
+
+oops:
+	if (upxd->server.nactive > 0) disable_all_servers (upxd);
+	if (upxd->mux) 
+	{
+		upxd->cbs->mux.close (upxd, upxd->mux);
+		upxd->mux = QSE_NULL;
+	}
+	return retv;
+}
+
+void qse_upxd_stop (qse_upxd_t* upxd)
+{
+	upxd->stopreq = 1;
+}
+
+int qse_upxd_enableserver (qse_upxd_t* upxd, qse_upxd_server_t* server)
+{
+	if (server->flags & QSE_UPXD_SERVER_ENABLED)
+	{
+		upxd->errnum = QSE_UPXD_EINVAL;
+		return -1;
+	}
+
+	return enable_server (upxd, server);
+}
+
+int qse_upxd_disableserver (qse_upxd_t* upxd, qse_upxd_server_t* server)
+{
+	if (!(server->flags & QSE_UPXD_SERVER_ENABLED))
+	{
+		upxd->errnum = QSE_UPXD_EINVAL;
+		return -1;
+	}
+
+	disable_server (upxd, server);
+	return 0;
+}
+
+int qse_upxd_poll (qse_upxd_t* upxd, qse_ntime_t timeout)
+{
+	int ret;
+
+	QSE_ASSERTX (upxd->cbs != QSE_NULL,
+		"Call qse_upxd_setcbs() before calling qse_upxd_loop()");
+
+	if (upxd->mux == QSE_NULL)
+	{
+		upxd->mux = upxd->cbs->	mux.open (upxd);
+		if (upxd->mux == QSE_NULL) return -1;
+	}
+	
+	ret = upxd->cbs->mux.poll (upxd, upxd->mux, timeout);
+	purge_idle_sessions (upxd);
+	
+	return ret;
+}

lib/http/upxd.h

@@ -0,0 +1,107 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _QSE_LIB_NET_UPXD_H_
+#define _QSE_LIB_NET_UPXD_H_
+
+#include <qse/http/upxd.h>
+#include "../cmn/mem-prv.h"
+
+typedef struct qse_upxd_server_session_t qse_upxd_server_session_t;
+
+struct qse_upxd_server_t
+{
+	qse_upxd_server_t* next;
+	qse_upxd_server_t* prev;
+
+#define QSE_UPXD_SERVER_ENABLED (1 << 0)
+	int flags;
+	
+	/* the socket can be bound to this interface.
+	 * sock->dev points to this buffer when necessary. */
+	qse_char_t dev[QSE_UPXD_SESSION_DEV_LEN + 1];
+
+	/* list of sessions beloning to this server */
+	struct
+	{
+		qse_upxd_server_session_t* list;
+		qse_size_t count;
+	} session;
+
+	qse_upxd_sock_t local;
+
+	/* user-defined context data that can be set
+	 * with qse_upxd_setserverctx() */
+	void* ctx;
+};
+
+struct qse_upxd_server_session_t
+{
+	/* internal fields */
+	qse_upxd_server_session_t* next;
+	qse_upxd_server_session_t* prev;
+
+	/* timestamps for housekeeping */
+	qse_ntime_t created;
+	qse_ntime_t modified;
+
+	/* socket used to talk with a peer */
+	qse_upxd_sock_t peer;
+
+	/* exposed to a caller via callbacks */
+	qse_upxd_session_t inner;
+};
+
+struct qse_upxd_t
+{
+	qse_mmgr_t* mmgr;
+	qse_upxd_errnum_t errnum;
+
+	int stopreq;
+	qse_upxd_cbs_t* cbs;
+
+	struct
+	{
+		qse_upxd_server_t* list;
+		qse_size_t nactive;
+	} server;
+
+	void* mux;
+	qse_uint8_t rbuf[65535];
+};
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+int qse_upxd_init (qse_upxd_t* upxd, qse_mmgr_t* mmgr);
+void qse_upxd_fini (qse_upxd_t* upxd);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif