281 lines
8.3 KiB
C
281 lines
8.3 KiB
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
|
|
* @brief Base64 encode/decode
|
|
* @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
|
|
*/
|
|
|
|
#include "common.h"
|
|
#include "base64.h"
|
|
#include "intreadwrite.h"
|
|
|
|
/* ---------------- private code */
|
|
static const uint8_t map2[256] =
|
|
{
|
|
0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff,
|
|
|
|
0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
|
|
0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
|
|
0xff, 0xff, 0xfe, 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,
|
|
|
|
0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
|
|
};
|
|
|
|
#define BASE64_DEC_STEP(i) do { \
|
|
bits = map2[in[i]]; \
|
|
if (bits & 0x80) \
|
|
goto out ## i; \
|
|
v = i ? (v << 6) + bits : bits; \
|
|
} while(0)
|
|
|
|
int av_base64_decode(uint8_t *out, const char *in_str, int out_size)
|
|
{
|
|
uint8_t *dst = out;
|
|
uint8_t *end = out + out_size;
|
|
// no sign extension
|
|
const uint8_t *in = in_str;
|
|
unsigned bits = 0xff;
|
|
unsigned v;
|
|
|
|
while (end - dst > 3) {
|
|
BASE64_DEC_STEP(0);
|
|
BASE64_DEC_STEP(1);
|
|
BASE64_DEC_STEP(2);
|
|
BASE64_DEC_STEP(3);
|
|
// Using AV_WB32 directly confuses compiler
|
|
v = av_be2ne32(v << 8);
|
|
AV_WN32(dst, v);
|
|
dst += 3;
|
|
in += 4;
|
|
}
|
|
if (end - dst) {
|
|
BASE64_DEC_STEP(0);
|
|
BASE64_DEC_STEP(1);
|
|
BASE64_DEC_STEP(2);
|
|
BASE64_DEC_STEP(3);
|
|
*dst++ = v >> 16;
|
|
if (end - dst)
|
|
*dst++ = v >> 8;
|
|
if (end - dst)
|
|
*dst++ = v;
|
|
in += 4;
|
|
}
|
|
while (1) {
|
|
BASE64_DEC_STEP(0);
|
|
in++;
|
|
BASE64_DEC_STEP(0);
|
|
in++;
|
|
BASE64_DEC_STEP(0);
|
|
in++;
|
|
BASE64_DEC_STEP(0);
|
|
in++;
|
|
}
|
|
|
|
out3:
|
|
*dst++ = v >> 10;
|
|
v <<= 2;
|
|
out2:
|
|
*dst++ = v >> 4;
|
|
out1:
|
|
out0:
|
|
return bits & 1 ? AVERROR_INVALIDDATA : 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(char *out, int out_size, const uint8_t *in, int in_size)
|
|
{
|
|
static const char b64[] =
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
|
char *ret, *dst;
|
|
unsigned i_bits = 0;
|
|
int i_shift = 0;
|
|
int bytes_remaining = in_size;
|
|
|
|
if (in_size >= UINT_MAX / 4 ||
|
|
out_size < AV_BASE64_SIZE(in_size))
|
|
return NULL;
|
|
ret = dst = out;
|
|
while (bytes_remaining > 3) {
|
|
i_bits = AV_RB32(in);
|
|
in += 3; bytes_remaining -= 3;
|
|
*dst++ = b64[ i_bits>>26 ];
|
|
*dst++ = b64[(i_bits>>20) & 0x3F];
|
|
*dst++ = b64[(i_bits>>14) & 0x3F];
|
|
*dst++ = b64[(i_bits>>8 ) & 0x3F];
|
|
}
|
|
i_bits = 0;
|
|
while (bytes_remaining) {
|
|
i_bits = (i_bits << 8) + *in++;
|
|
bytes_remaining--;
|
|
i_shift += 8;
|
|
}
|
|
while (i_shift > 0) {
|
|
*dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
|
|
i_shift -= 6;
|
|
}
|
|
while ((dst - ret) & 3)
|
|
*dst++ = '=';
|
|
*dst = '\0';
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef TEST
|
|
// LCOV_EXCL_START
|
|
|
|
#define MAX_DATA_SIZE 1024
|
|
#define MAX_ENCODED_SIZE 2048
|
|
|
|
static int test_encode_decode(const uint8_t *data, unsigned int data_size,
|
|
const char *encoded_ref)
|
|
{
|
|
char encoded[MAX_ENCODED_SIZE];
|
|
uint8_t data2[MAX_DATA_SIZE];
|
|
int data2_size, max_data2_size = MAX_DATA_SIZE;
|
|
|
|
if (!av_base64_encode(encoded, MAX_ENCODED_SIZE, data, data_size)) {
|
|
printf("Failed: cannot encode the input data\n");
|
|
return 1;
|
|
}
|
|
if (encoded_ref && strcmp(encoded, encoded_ref)) {
|
|
printf("Failed: encoded string differs from reference\n"
|
|
"Encoded:\n%s\nReference:\n%s\n", encoded, encoded_ref);
|
|
return 1;
|
|
}
|
|
|
|
if ((data2_size = av_base64_decode(data2, encoded, max_data2_size)) != data_size) {
|
|
printf("Failed: cannot decode the encoded string\n"
|
|
"Encoded:\n%s\n", encoded);
|
|
return 1;
|
|
}
|
|
if ((data2_size = av_base64_decode(data2, encoded, data_size)) != data_size) {
|
|
printf("Failed: cannot decode with minimal buffer\n"
|
|
"Encoded:\n%s\n", encoded);
|
|
return 1;
|
|
}
|
|
if (memcmp(data2, data, data_size)) {
|
|
printf("Failed: encoded/decoded data differs from original data\n");
|
|
return 1;
|
|
}
|
|
if (av_base64_decode(NULL, encoded, 0) != 0) {
|
|
printf("Failed: decode to NULL buffer\n");
|
|
return 1;
|
|
}
|
|
if (strlen(encoded)) {
|
|
char *end = strchr(encoded, '=');
|
|
if (!end)
|
|
end = encoded + strlen(encoded) - 1;
|
|
*end = '%';
|
|
if (av_base64_decode(NULL, encoded, 0) >= 0) {
|
|
printf("Failed: error detection\n");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
printf("Passed!\n");
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char ** argv)
|
|
{
|
|
int i, error_count = 0;
|
|
struct test {
|
|
const uint8_t *data;
|
|
const char *encoded_ref;
|
|
} tests[] = {
|
|
{ "", ""},
|
|
{ "1", "MQ=="},
|
|
{ "22", "MjI="},
|
|
{ "333", "MzMz"},
|
|
{ "4444", "NDQ0NA=="},
|
|
{ "55555", "NTU1NTU="},
|
|
{ "666666", "NjY2NjY2"},
|
|
{ "abc:def", "YWJjOmRlZg=="},
|
|
};
|
|
char in[1024], out[2048];
|
|
|
|
printf("Encoding/decoding tests\n");
|
|
for (i = 0; i < FF_ARRAY_ELEMS(tests); i++)
|
|
error_count += test_encode_decode(tests[i].data, strlen(tests[i].data), tests[i].encoded_ref);
|
|
|
|
if (argc>1 && !strcmp(argv[1], "-t")) {
|
|
memset(in, 123, sizeof(in));
|
|
for(i=0; i<10000; i++){
|
|
START_TIMER
|
|
av_base64_encode(out, sizeof(out), in, sizeof(in));
|
|
STOP_TIMER("encode")
|
|
}
|
|
for(i=0; i<10000; i++){
|
|
START_TIMER
|
|
av_base64_decode(in, out, sizeof(in));
|
|
STOP_TIMER("decode")
|
|
}
|
|
|
|
for(i=0; i<10000; i++){
|
|
START_TIMER
|
|
av_base64_decode(NULL, out, 0);
|
|
STOP_TIMER("syntax check")
|
|
}
|
|
}
|
|
|
|
if (error_count)
|
|
printf("Error Count: %d.\n", error_count);
|
|
|
|
return !!error_count;
|
|
}
|
|
|
|
// LCOV_EXCL_STOP
|
|
#endif
|