122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/*
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* $Id$
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*
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Copyright (c) 2006-2019 Chung, Hyung-Hwan. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#if defined(macintosh)
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# include <:qse:cmn:alg.h>
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#else
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# include <qse/cmn/alg.h>
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#endif
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#define ENC(x) \
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((x < 26)? (QSE_MT('A') + x): \
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(x < 52)? (QSE_MT('a') + (x - 26)): \
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(x < 62)? (QSE_MT('0') + (x - 52)): \
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(x == 62)? QSE_MT('+'): QSE_MT('/'))
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#define DEC(x) \
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((x >= QSE_MT('A') && x <= QSE_MT('Z'))? (x - QSE_MT('A')): \
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(x >= QSE_MT('a') && x <= QSE_MT('z'))? (x - QSE_MT('a') + 26): \
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(x >= QSE_MT('0') && x <= QSE_MT('9'))? (x - QSE_MT('0') + 52): \
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(x == QSE_MT('+'))? 62: 63)
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qse_size_t qse_enbase64 (
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const void* in, qse_size_t isz,
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qse_mchar_t* out, qse_size_t osz, qse_size_t* xsz)
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{
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const qse_uint8_t* ib = (const qse_uint8_t*)in;
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qse_size_t idx = 0, idx2 = 0, i;
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/* 3 8-bit values to 4 6-bit values */
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for (i = 0; i < isz; i += 3)
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{
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qse_uint8_t b1, b2, b3;
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qse_uint8_t c1, c2, c3, c4;
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b1 = ib[i];
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b2 = (i + 1 < isz)? ib[i + 1]: 0;
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b3 = (i + 2 < isz)? ib[i + 2]: 0;
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c1 = b1 >> 2;
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c2 = ((b1 & 0x03) << 4) | (b2 >> 4);
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c3 = ((b2 & 0x0F) << 2) | (b3 >> 6);
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c4 = b3 & 0x3F;
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if (idx + 3 < osz)
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{
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out[idx++] = ENC(c1);
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out[idx++] = ENC(c2);
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out[idx++] = (i + 1 < isz)? ENC(c3): QSE_MT('=');
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out[idx++] = (i + 2 < isz)? ENC(c4): QSE_MT('=');
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}
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idx2 += 4;
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}
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if (xsz) *xsz = idx2;
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return idx;
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}
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qse_size_t qse_debase64 (
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const qse_mchar_t* in, qse_size_t isz,
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void* out, qse_size_t osz, qse_size_t* xsz)
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{
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qse_uint8_t* ob = (qse_uint8_t*)out;
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qse_size_t idx = 0, idx2 = 0, i;
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for (i = 0; i < isz; i += 4)
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{
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qse_uint8_t c1, c2, c3, c4;
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qse_uint8_t b1, b2, b3, b4;
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c1 = in[i];
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c2 = (i + 1 < isz)? in[i + 1]: QSE_MT('A');
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c3 = (i + 2 < isz)? in[i + 2]: QSE_MT('A');
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c4 = (i + 3 < isz)? in[i + 3]: QSE_MT('A');
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b1 = DEC(c1);
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b2 = DEC(c2);
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b3 = DEC(c3);
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b4 = DEC(c4);
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idx2++;
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if (idx < osz) ob[idx++] = (b1 << 2) | (b2 >> 4);
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if (c3 != QSE_MT('='))
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{
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idx2++;
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if (idx < osz) ob[idx++] = ((b2 & 0x0F) << 4) | (b3 >> 2);
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}
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if (c4 != QSE_MT('='))
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{
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idx2++;
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if (idx < osz) ob[idx++] = ((b3 & 0x03) << 6) | b4;
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}
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}
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if (xsz) *xsz = idx2;
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return idx;
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}
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