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more code for tar extraction

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This commit is contained in:
hyung-hwan 2022-12-13 14:21:19 +00:00
parent 9bea60d43a
commit 7904964e0d
3 changed files with 95 additions and 238 deletions
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21
bin/untar.c
View File

@ -6,7 +6,7 @@
int main (int argc, char* argv[])
{
hio_t* hio;
hio_tar_t* untar;
hio_tar_t* tar;
FILE* fp;
if (argc != 2)
@ -22,10 +22,10 @@ int main (int argc, char* argv[])
return -1;
}
untar = hio_tar_open(hio, 0);
if (!untar)
tar = hio_tar_open(hio, 0);
if (!tar)
{
fprintf (stderr, "Error: unable to open untar\n");
fprintf (stderr, "Error: unable to open tar\n");
hio_close (hio);
return -1;
}
@ -34,31 +34,30 @@ int main (int argc, char* argv[])
if (!fp)
{
fprintf (stderr, "Error: unable to open file %s\n", argv[1]);
hio_tar_close (untar);
hio_tar_close (tar);
hio_close (hio);
return -1;
}
//hio_extract_tar(hio, argv[1]);
while (!feof(fp) && !ferror(fp))
{
int n;
char buf[512]; /* TODO: use a different buffer size???*/
char buf[4096]; /* TODO: use a different buffer size???*/
n = fread(buf, 1, sizeof(buf), fp);
if (n > 0)
{
if (hio_tar_feed(untar, buf, n) <= -1)
if (hio_tar_xfeed(tar, buf, n) <= -1)
{
fprintf (stderr, "Error: untar error - %s\n", hio_geterrbmsg(hio));
fprintf (stderr, "Error: tar error - %s\n", hio_geterrbmsg(hio));
break;
}
}
}
hio_tar_feed (untar, HIO_NULL, 0); /* indicate the end of input */
hio_tar_endxfeed (tar); /* indicate the end of input */
fclose (fp);
hio_tar_close (untar);
hio_tar_close (tar);
hio_close (hio);
return 0;
}

34
lib/hio-tar.h
View File

@ -75,8 +75,7 @@ enum hio_tar_state_t
{
HIO_TAR_STATE_START,
HIO_TAR_STATE_FILE,
HIO_TAR_STATE_END_1,
HIO_TAR_STATE_END_2
HIO_TAR_STATE_END
};
typedef enum hio_tar_state_t hio_tar_state_t;
@ -84,20 +83,25 @@ struct hio_tar_t
{
hio_t* hio;
hio_tar_state_t state;
struct
{
hio_uint8_t buf[HIO_TAR_BLKSIZE];
hio_oow_t len;
} blk;
hio_tar_state_t state;
struct
{
hio_uint8_t buf[HIO_TAR_BLKSIZE];
hio_oow_t len;
} blk;
struct
{
hio_uintmax_t filesize;
hio_uintmax_t filemode;
hio_becs_t filename;
void* fp;
} hi;
struct
{
hio_uintmax_t devmajor;
hio_uintmax_t devminor;
hio_uintmax_t filesize;
hio_uintmax_t filemode;
hio_becs_t filename;
void* fp;
} hi;
} x; /* extract */
};
typedef struct hio_tar_t hio_tar_t;
@ -123,9 +127,9 @@ HIO_EXPORT void hio_tar_fini (
hio_tar_t* tar
);
#define hio_tar_endfeed(tar) hio_tar_feed(tar, HIO_NULL, 0)
#define hio_tar_endxfeed(tar) hio_tar_xfeed(tar, HIO_NULL, 0)
HIO_EXPORT int hio_tar_feed (
HIO_EXPORT int hio_tar_xfeed (
hio_tar_t* tar,
const void* ptr,
hio_oow_t len

276
lib/tar.c
View File

@ -4,6 +4,8 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
@ -56,140 +58,6 @@ static int create_dir (hio_bch_t *pathname, int mode)
return n;
}
#if 0
static FILE* create_file (char *pathname, int mode)
{
FILE *fp;
fp = fopen(pathname, "wb+");
if (!fp)
{
char* p = hio_rfind_bchar_in_bcstr(pathname, '/');
if (p)
{
*p = '\0';
create_dir(pathname, 0755);
*p = '/';
fp = fopen(pathname, "wb+");
}
}
return fp;
}
static int extract_tar (hio_t* hio, FILE* fp)
{
char buf[HIO_TAR_BLKSIZE];
FILE* f = NULL;
int filesize;
while (1)
{
int is_sober;
const hio_bch_t* endptr;
hio_iolen_t nbytes;
hio_tar_hdr_t* hdr;
hio_uint32_t mode;
nbytes = fread(buf, 1, HIO_TAR_BLKSIZE, fp);
if (nbytes < HIO_TAR_BLKSIZE)
{
hio_seterrbfmt (hio, HIO_EINVAL, "truncated trailing block");
return -1;
}
/* all-zero byte block ends the archive */
if (HIO_MEMCMP(buf, _end_block, HIO_TAR_BLKSIZE) == 0) break;
#if 0
if (!verify_checksum(buf))
{
hio_seterrbfmt (hio, HIO_EINVAL, "invalid checksum value");
return -1;
}
#endif
hdr = (hio_tar_hdr_t*)buf;
filesize = hio_bchars_to_uintmax(hdr->size, HIO_COUNTOF(hdr->size), HIO_BCHARS_TO_UINTMAX_MAKE_OPTION(0,0,0,8), &endptr, &is_sober);
mode = hio_bchars_to_uintmax(hdr->mode, HIO_COUNTOF(hdr->mode), HIO_BCHARS_TO_UINTMAX_MAKE_OPTION(0,0,0,8), &endptr, &is_sober);
switch (hdr->typeflag)
{
case HIO_TAR_LNKTYPE:
printf(" Ignoring hardlink %s\n", filename);
break;
case HIO_TAR_SYMTYPE:
printf(" Ignoring symlink %s\n", filename);
break;
case HIO_TAR_CHRTYPE:
printf(" Ignoring character device %s\n", filename);
break;
case HIO_TAR_BLKTYPE:
printf(" Ignoring block device %s\n", filename);
break;
case HIO_TAR_DIRTYPE:
printf(" Extracting dir %s\n", filename);
if (filesize != 0)
{
/* something wrong */
}
create_dir(filename, mode);
break;
case HIO_TAR_FIFOTYPE:
printf(" Ignoring FIFO %s\n", filename);
break;
case HIO_TAR_CONTTYPE:
printf(" Ignoring cont %s\n", filename);
break;
default:
printf(" Extracting file %s\n", filename);
f = create_file(filename, mode);
while (filesize > 0)
{
nbytes = fread(buf, 1, HIO_TAR_BLKSIZE, fp);
if (nbytes < HIO_TAR_BLKSIZE)
{
fprintf(stderr, "Short read - Expected 512, got %d\n", (int)nbytes);
return -1;
}
if (filesize < HIO_TAR_BLKSIZE) nbytes = filesize;
if (f)
{
if (fwrite(buf, 1, nbytes, f) != nbytes)
{
fprintf(stderr, "Failed write\n");
break;
}
}
filesize -= nbytes;
}
fclose (f);
break;
}
}
return 0;
}
int hio_extract_tar (hio_t* hio, const hio_bch_t* archive_file)
{
FILE* fp;
int n;
fp = fopen(archive_file, "r");
if (!fp) return -1;
n = extract_tar(hio, fp);
fclose (fp);
return n;
}
#endif
hio_tar_t* hio_tar_open (hio_t* hio, hio_oow_t xtnsize)
{
hio_tar_t* tar;
@ -216,37 +84,38 @@ void hio_tar_close (hio_tar_t* tar)
int hio_tar_init (hio_tar_t* tar, hio_t* hio)
{
tar->hio = hio;
tar->state = HIO_TAR_STATE_START;
tar->blk.len = 0;
hio_becs_init (&tar->hi.filename, tar->hio, 0); /* won't fail with the capacity of 0 */
tar->x.state = HIO_TAR_STATE_START;
tar->x.blk.len = 0;
hio_becs_init (&tar->x.hi.filename, tar->hio, 0); /* won't fail with the capacity of 0 */
return 0;
}
void hio_tar_fini (hio_tar_t* tar)
{
hio_becs_fini (&tar->hi.filename);
if (tar->hi.fp)
hio_becs_fini (&tar->x.hi.filename);
if (tar->x.hi.fp)
{
/* clean up */
fclose (tar->hi.fp);
tar->hi.fp = HIO_NULL;
fclose (tar->x.hi.fp);
tar->x.hi.fp = HIO_NULL;
}
}
static int process_header (hio_tar_t* tar)
/* extraction - the implementation is still far from completion */
static int x_process_header (hio_tar_t* tar)
{
hio_tar_hdr_t* hdr;
HIO_ASSERT (tar->hio, tar->state == HIO_TAR_STATE_START);
HIO_ASSERT (tar->hio, tar->blk.len == HIO_TAR_BLKSIZE);
hdr = (hio_tar_hdr_t*)tar->blk.buf;
HIO_ASSERT (tar->hio, tar->x.state == HIO_TAR_STATE_START);
HIO_ASSERT (tar->hio, tar->x.blk.len == HIO_TAR_BLKSIZE);
hdr = (hio_tar_hdr_t*)tar->x.blk.buf;
printf("process_header...\n");
/* all-zero byte block ends the archive */
if (HIO_MEMCMP(hdr, _end_block, HIO_TAR_BLKSIZE) == 0)
{
/* two all-zero blocks are expected as the EOF indicator */
tar->state = HIO_TAR_STATE_END_1;
tar->x.state = HIO_TAR_STATE_END;
}
else
{
@ -254,63 +123,52 @@ printf("process_header...\n");
const hio_bch_t* endptr;
const hio_bch_t* filename;
tar->hi.filesize = hio_bchars_to_uintmax(hdr->size, HIO_COUNTOF(hdr->size), HIO_BCHARS_TO_UINTMAX_MAKE_OPTION(0,0,0,8), &endptr, &is_sober);
tar->hi.filemode = hio_bchars_to_uintmax(hdr->mode, HIO_COUNTOF(hdr->mode), HIO_BCHARS_TO_UINTMAX_MAKE_OPTION(0,0,0,8), &endptr, &is_sober);
tar->x.hi.filesize = hio_bchars_to_uintmax(hdr->size, HIO_COUNTOF(hdr->size), HIO_BCHARS_TO_UINTMAX_MAKE_OPTION(0,0,0,8), &endptr, &is_sober);
tar->x.hi.filemode = hio_bchars_to_uintmax(hdr->mode, HIO_COUNTOF(hdr->mode), HIO_BCHARS_TO_UINTMAX_MAKE_OPTION(0,0,0,8), &endptr, &is_sober);
tar->x.hi.devmajor = hio_bchars_to_uintmax(hdr->devmajor, HIO_COUNTOF(hdr->devmajor), HIO_BCHARS_TO_UINTMAX_MAKE_OPTION(0,0,0,8), &endptr, &is_sober);
tar->x.hi.devminor = hio_bchars_to_uintmax(hdr->devminor, HIO_COUNTOF(hdr->devminor), HIO_BCHARS_TO_UINTMAX_MAKE_OPTION(0,0,0,8), &endptr, &is_sober);
if (tar->hi.fp)
if (tar->x.hi.fp)
{
/* just in case */
fclose (tar->hi.fp);
tar->hi.fp = HIO_NULL;
fclose (tar->x.hi.fp);
tar->x.hi.fp = HIO_NULL;
}
hio_becs_clear (&tar->hi.filename);
if (hio_becs_cat(&tar->hi.filename, hdr->prefix) == (hio_oow_t)-1 ||
hio_becs_cat(&tar->hi.filename, hdr->name) == (hio_oow_t)-1)
hio_becs_clear (&tar->x.hi.filename);
if (hio_becs_cat(&tar->x.hi.filename, hdr->prefix) == (hio_oow_t)-1 ||
hio_becs_cat(&tar->x.hi.filename, hdr->name) == (hio_oow_t)-1)
{
return -1;
}
filename = HIO_BECS_PTR(&tar->hi.filename);
printf ("file size = %u [%s]\n", (unsigned int)tar->hi.filesize, filename);
filename = HIO_BECS_PTR(&tar->x.hi.filename);
switch (hdr->typeflag)
{
case HIO_TAR_LNKTYPE:
printf(" Ignoring hardlink %s\n", filename);
link (hdr->linkname, filename);
break;
case HIO_TAR_SYMTYPE:
printf(" Ignoring symlink %s\n", filename);
symlink (hdr->linkname, filename); /* TODO: error check */
break;
case HIO_TAR_CHRTYPE:
printf(" Ignoring character device %s\n", filename);
mknod (filename, S_IFCHR | tar->x.hi.filemode, ((tar->x.hi.devmajor << 8) | tar->x.hi.devminor));
break;
case HIO_TAR_BLKTYPE:
printf(" Ignoring block device %s\n", filename);
mknod (filename, S_IFBLK | tar->x.hi.filemode, ((tar->x.hi.devmajor << 8) | tar->x.hi.devminor));
break;
case HIO_TAR_DIRTYPE:
printf(" Extracting dir %s\n", filename);
#if 0
if (tar->hio.filesize != 0)
{
/* something wrong */
}
#endif
create_dir(hdr->name, tar->hi.filemode);
create_dir (hdr->name, tar->x.hi.filemode);
break;
case HIO_TAR_FIFOTYPE:
printf(" Ignoring FIFO %s\n", filename);
break;
case HIO_TAR_CONTTYPE:
printf(" Ignoring cont %s\n", filename);
mkfifo (filename, tar->x.hi.filemode);
break;
case HIO_TAR_CONTTYPE: /* treate it like REGTYPE for now */
default: /* HIO_TAR_REGTYPE */
{
FILE* fp;
printf(" Extracting file %s\n", filename);
fp = fopen(filename, "wb+");
if (!fp)
{
@ -318,53 +176,53 @@ printf ("file size = %u [%s]\n", (unsigned int)tar->hi.filesize, filename);
return -1;
}
fchmod (fileno(fp), tar->hi.filemode);
fchmod (fileno(fp), tar->x.hi.filemode);
tar->hi.fp = fp;
tar->state = HIO_TAR_STATE_FILE;
tar->x.hi.fp = fp;
tar->x.state = HIO_TAR_STATE_FILE;
goto done;
}
}
tar->state = HIO_TAR_STATE_START;
tar->x.state = HIO_TAR_STATE_START;
}
done:
return 0;
}
static int process_content (hio_tar_t* tar)
static int x_process_content (hio_tar_t* tar)
{
hio_oow_t chunksize;
HIO_ASSERT (tar->hio, tar->blk.len == HIO_TAR_BLKSIZE);
HIO_ASSERT (tar->hio, tar->hi.filesize > 0);
HIO_ASSERT (tar->hio, tar->hi.fp != HIO_NULL);
HIO_ASSERT (tar->hio, tar->x.blk.len == HIO_TAR_BLKSIZE);
HIO_ASSERT (tar->hio, tar->x.hi.filesize > 0);
HIO_ASSERT (tar->hio, tar->x.hi.fp != HIO_NULL);
chunksize = tar->hi.filesize < tar->blk.len? tar->hi.filesize: tar->blk.len;
chunksize = tar->x.hi.filesize < tar->x.blk.len? tar->x.hi.filesize: tar->x.blk.len;
/* TODO: error check */
fwrite (tar->blk.buf, 1, chunksize, tar->hi.fp);
fwrite (tar->x.blk.buf, 1, chunksize, tar->x.hi.fp);
tar->hi.filesize -= chunksize;
if (tar->hi.filesize <= 0)
tar->x.hi.filesize -= chunksize;
if (tar->x.hi.filesize <= 0)
{
/* end of file */
fclose (tar->hi.fp);
tar->hi.fp = HIO_NULL;
fclose (tar->x.hi.fp);
tar->x.hi.fp = HIO_NULL;
tar->state = HIO_TAR_STATE_START;
tar->x.state = HIO_TAR_STATE_START;
}
return 0;
}
int hio_tar_feed (hio_tar_t* tar, const void* ptr, hio_oow_t len)
int hio_tar_xfeed (hio_tar_t* tar, const void* ptr, hio_oow_t len)
{
if (!ptr)
{
/* EOF indicator */
if ((tar->state != HIO_TAR_STATE_END_1 && tar->state != HIO_TAR_STATE_END_2) || tar->blk.len > 0)
if (tar->x.state != HIO_TAR_STATE_END || tar->x.blk.len > 0)
{
/* ERROR - premature end of file */
hio_seterrbfmt (tar->hio, HIO_EINVAL, "premature end of feed");
@ -376,43 +234,39 @@ int hio_tar_feed (hio_tar_t* tar, const void* ptr, hio_oow_t len)
{
hio_oow_t cplen;
cplen = HIO_COUNTOF(tar->blk.buf) - tar->blk.len; /* required length to fill a block */
cplen = HIO_COUNTOF(tar->x.blk.buf) - tar->x.blk.len; /* required length to fill a block */
if (len < cplen) cplen = len; /* not enough to fill a block */
HIO_MEMCPY (&tar->blk.buf[tar->blk.len], ptr, cplen);
tar->blk.len += cplen;
HIO_MEMCPY (&tar->x.blk.buf[tar->x.blk.len], ptr, cplen);
tar->x.blk.len += cplen;
len -= cplen;
ptr += cplen;
if (tar->blk.len == HIO_COUNTOF(tar->blk.buf))
if (tar->x.blk.len == HIO_COUNTOF(tar->x.blk.buf))
{
/* on a complete block */
switch (tar->state)
switch (tar->x.state)
{
case HIO_TAR_STATE_START:
if (process_header(tar) <= -1) return -1;
if (x_process_header(tar) <= -1) return -1;
break;
case HIO_TAR_STATE_FILE:
if (process_content(tar) <= -1) return -1;
if (x_process_content(tar) <= -1) return -1;
break;
case HIO_TAR_STATE_END_1:
if (HIO_MEMCMP(tar->blk.buf, _end_block, HIO_TAR_BLKSIZE) == 0)
case HIO_TAR_STATE_END:
if (HIO_MEMCMP(tar->x.blk.buf, _end_block, HIO_TAR_BLKSIZE) != 0)
{
tar->state = HIO_TAR_STATE_END_2;
break;
hio_seterrbfmt (tar->hio, HIO_EINVAL, "trailing garbage at the end of feed");
return -1;
}
/* fall thru here for the trailing garbage error */
case HIO_TAR_STATE_END_2:
/* garbage after the final ending block */
hio_seterrbfmt (tar->hio, HIO_EINVAL, "trailing garbage at the end of feed");
return -1;
/* there may come multiple EOF marker blocks depending on the logical record size.
* this implementation doesn't care how much such blocks are given */
break;
}
tar->blk.len = 0;
tar->x.blk.len = 0;
}
}