101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/*
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* Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file libavutil/base64.c
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* @brief Base64 encode/decode
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* @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
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*/
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#include "common.h"
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#include "base64.h"
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/* ---------------- private code */
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static const uint8_t map2[] =
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{
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0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
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0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01,
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0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
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0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
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0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
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0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
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0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
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0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
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};
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int av_base64_decode(uint8_t * out, const char *in, int out_length)
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{
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int i, v;
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uint8_t *dst = out;
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v = 0;
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for (i = 0; in[i] && in[i] != '='; i++) {
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unsigned int index= in[i]-43;
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if (index>=FF_ARRAY_ELEMS(map2) || map2[index] == 0xff)
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return -1;
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v = (v << 6) + map2[index];
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if (i & 3) {
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if (dst - out < out_length) {
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*dst++ = v >> (6 - 2 * (i & 3));
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}
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}
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}
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return dst - out;
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}
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/*****************************************************************************
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* b64_encode: Stolen from VLC's http.c.
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* Simplified by Michael.
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* Fixed edge cases and made it work from data (vs. strings) by Ryan.
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*****************************************************************************/
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char *av_base64_encode(char * buf, int buf_len, const uint8_t * src, int len)
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{
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static const char b64[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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char *ret, *dst;
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unsigned i_bits = 0;
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int i_shift = 0;
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int bytes_remaining = len;
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if (len >= UINT_MAX / 4 ||
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buf_len < len * 4 / 3 + 12)
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return NULL;
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ret = dst = buf;
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while (bytes_remaining) {
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i_bits = (i_bits << 8) + *src++;
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bytes_remaining--;
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i_shift += 8;
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do {
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*dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
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i_shift -= 6;
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} while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
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}
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while ((dst - ret) & 3)
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*dst++ = '=';
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*dst = '\0';
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return ret;
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}
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