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Add base64 encoding and decoding routines

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Patch Ryan Martell % rdm4 A martellventures P com %
Original thread:
Date: Oct 27, 2006 6:49 PM
Subject: [Ffmpeg-devel] [PATCH] Base64 code

Originally committed as revision 6816 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Guillaume Poirier 18 years ago
parent ebd6a69444
commit a01e68aa5e
2 changed files with 255 additions and 0 deletions
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  1. 231
      libavformat/base64.c
  2. 24
      libavformat/base64.h

231
libavformat/base64.c
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/*
* Base64.c
* Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file base64.c
* @brief Base64 Encode/Decode
* @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
*/
#include "common.h"
#include "base64.h"
/* ---------------- private code */
static uint8_t map2[] =
{
0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01,
0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
};
int av_base64_decode(uint8_t * out, const char *in, int out_length)
{
int i, v;
uint8_t *dst = out;
v = 0;
for (i = 0; in[i] && in[i] != '='; i++) {
unsigned int index= in[i]-43;
if (index>=(sizeof(map2)/sizeof(map2[0])) || map2[index] == 0xff)
return -1;
v = (v << 6) + map2[index];
if (i & 3) {
if (dst - out < out_length) {
*dst++ = v >> (6 - 2 * (i & 3));
}
}
}
return (dst - out);
}
/*****************************************************************************
* b64_encode: stolen from VLC's http.c
* simplified by michael
* fixed edge cases and made it work from data (vs. strings) by ryan.
*****************************************************************************/
char *av_base64_encode(uint8_t * src, int len)
{
static const char b64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char *ret, *dst;
unsigned i_bits = 0;
int i_shift = 0;
int bytes_remaining = len;
if (len < UINT_MAX / 4) {
ret = dst = av_malloc(len * 4 / 3 + 12);
} else
return NULL;
if (len) { // special edge case, what should we really do here?
while (bytes_remaining) {
i_bits = (i_bits << 8) + *src++;
bytes_remaining--;
i_shift += 8;
do {
*dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
i_shift -= 6;
} while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
}
while ((dst - ret) & 3)
*dst++ = '=';
}
*dst = '\0';
return ret;
}
// #define TEST_BASE64
#ifdef TEST_BASE64
#include "avutil.h"
int b64test()
{
int numerr = 0;
int len;
int numtest = 1;
uint8_t decode[1000];
struct test {
void *data;
int len;
const char *result;
} *t, tests[] = {
{
"", 0, ""}, {
"1", 1, "MQ=="}, {
"22", 2, "MjI="}, {
"333", 3, "MzMz"}, {
"4444", 4, "NDQ0NA=="}, {
"55555", 5, "NTU1NTU="}, {
"abc:def", 7, "YWJjOmRlZg=="}, {
NULL}
};
for (t = tests; t->data; t++) {
char *str;
av_log(NULL, AV_LOG_ERROR, "Encoding %s...\n", (char *) t->data);
str = av_base64_encode(t->data, t->len);
if (str) {
av_log(NULL, AV_LOG_ERROR, "Encoded to %s...\n", str);
if (strcmp(str, t->result) != 0) {
av_log(NULL, AV_LOG_ERROR, "failed test %d: %s != %s\n",
numtest, str, t->result);
numerr++;
}
av_free(str);
}
av_log(NULL, AV_LOG_ERROR, "Done encoding, about to decode...\n");
len = av_base64_decode(decode, t->result, sizeof(decode));
if (len != t->len) {
av_log(NULL, AV_LOG_ERROR, "failed test %d: len %d != %d\n",
numtest, len, t->len);
numerr++;
} else if (memcmp(decode, t->data, t->len) != 0) {
av_log(NULL, AV_LOG_ERROR, "failed test %d: data\n", numtest);
numerr++;
} else {
av_log(NULL, AV_LOG_ERROR, "Decoded to %s\n",
(char *) t->data);
}
numtest++;
}
#undef srand
#undef rand
{
int test_count;
srand(123141); // time(NULL));
for (test_count = 0; test_count < 100; test_count++) {
int size = rand() % 1024;
int ii;
uint8_t *data;
char *encoded_result;
av_log(NULL, AV_LOG_ERROR, "Test %d: Size %d bytes...",
test_count, size);
data = (uint8_t *) av_malloc(size);
for (ii = 0; ii < size; ii++) {
data[ii] = rand() % 255;
}
encoded_result = av_base64_encode(data, size);
if (encoded_result) {
int decode_buffer_size = size + 10; // try without 10 as well
uint8_t *decode_buffer = av_malloc(decode_buffer_size);
if (decode_buffer) {
int decoded_size =
av_base64_decode(decode_buffer, encoded_result,
decode_buffer_size);
if (decoded_size != size) {
av_log(NULL, AV_LOG_ERROR,
"Decoded/Encoded size mismatch (%d != %d)\n",
decoded_size, size);
} else {
if (memcmp(decode_buffer, data, decoded_size) == 0) {
av_log(NULL, AV_LOG_ERROR, "Passed!\n");
} else {
av_log(NULL, AV_LOG_ERROR,
"Failed (Data differs)!\n");
}
}
av_free(decode_buffer);
}
av_free(encoded_result);
}
}
}
// these are invalid strings, that it currently decodes (which it probably shouldn't?)
{
uint8_t str[32];
if (av_base64_decode(str, "M=M=", sizeof(str)) != -1) {
av_log(NULL, AV_LOG_ERROR,
"failed test %d: successful decode of `M=M='\n",
numtest++);
numerr++;
}
if (av_base64_decode(str, "MQ===", sizeof(str)) != -1) {
av_log(NULL, AV_LOG_ERROR,
"failed test %d: successful decode of `MQ==='\n",
numtest++);
numerr++;
}
}
return numerr;
}
#endif

24
libavformat/base64.h
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/*
* Base64.c
* Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
int av_base64_decode(uint8_t * out, const char *in, int out_length); // param order as strncpy()
char *av_base64_encode(uint8_t * src, int len); // src is not a string, it's data.
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