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  1. /*
  2.  * Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. /**
  22.  * @file
  23.  * @brief Base64 encode/decode
  24.  * @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
  25.  */
  26.  
  27. #include "common.h"
  28. #include "base64.h"
  29. #include "intreadwrite.h"
  30.  
  31. /* ---------------- private code */
  32. static const uint8_t map2[256] =
  33. {
  34.     0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  35.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  36.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  37.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  38.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  39.     0xff, 0xff, 0xff,
  40.  
  41.     0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
  42.     0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
  43.     0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x00, 0x01,
  44.     0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
  45.     0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
  46.     0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
  47.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
  48.     0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
  49.     0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
  50.     0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33,
  51.  
  52.                       0xff, 0xff, 0xff, 0xff, 0xff,
  53.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  54.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  55.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  56.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  57.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  58.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  59.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  60.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  61.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  62.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  63.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  64.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  65.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  66.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  67.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  68.     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  69. };
  70.  
  71. #define BASE64_DEC_STEP(i) do { \
  72.     bits = map2[in[i]]; \
  73.     if (bits & 0x80) \
  74.         goto out ## i; \
  75.     v = i ? (v << 6) + bits : bits; \
  76. } while(0)
  77.  
  78. int av_base64_decode(uint8_t *out, const char *in_str, int out_size)
  79. {
  80.     uint8_t *dst = out;
  81.     uint8_t *end = out + out_size;
  82.     // no sign extension
  83.     const uint8_t *in = in_str;
  84.     unsigned bits = 0xff;
  85.     unsigned v;
  86.  
  87.     while (end - dst > 3) {
  88.         BASE64_DEC_STEP(0);
  89.         BASE64_DEC_STEP(1);
  90.         BASE64_DEC_STEP(2);
  91.         BASE64_DEC_STEP(3);
  92.         // Using AV_WB32 directly confuses compiler
  93.         v = av_be2ne32(v << 8);
  94.         AV_WN32(dst, v);
  95.         dst += 3;
  96.         in += 4;
  97.     }
  98.     if (end - dst) {
  99.         BASE64_DEC_STEP(0);
  100.         BASE64_DEC_STEP(1);
  101.         BASE64_DEC_STEP(2);
  102.         BASE64_DEC_STEP(3);
  103.         *dst++ = v >> 16;
  104.         if (end - dst)
  105.             *dst++ = v >> 8;
  106.         if (end - dst)
  107.             *dst++ = v;
  108.         in += 4;
  109.     }
  110.     while (1) {
  111.         BASE64_DEC_STEP(0);
  112.         in++;
  113.         BASE64_DEC_STEP(0);
  114.         in++;
  115.         BASE64_DEC_STEP(0);
  116.         in++;
  117.         BASE64_DEC_STEP(0);
  118.         in++;
  119.     }
  120.  
  121. out3:
  122.     *dst++ = v >> 10;
  123.     v <<= 2;
  124. out2:
  125.     *dst++ = v >> 4;
  126. out1:
  127. out0:
  128.     return bits & 1 ? AVERROR_INVALIDDATA : dst - out;
  129. }
  130.  
  131. /*****************************************************************************
  132. * b64_encode: Stolen from VLC's http.c.
  133. * Simplified by Michael.
  134. * Fixed edge cases and made it work from data (vs. strings) by Ryan.
  135. *****************************************************************************/
  136.  
  137. char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
  138. {
  139.     static const char b64[] =
  140.         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  141.     char *ret, *dst;
  142.     unsigned i_bits = 0;
  143.     int i_shift = 0;
  144.     int bytes_remaining = in_size;
  145.  
  146.     if (in_size >= UINT_MAX / 4 ||
  147.         out_size < AV_BASE64_SIZE(in_size))
  148.         return NULL;
  149.     ret = dst = out;
  150.     while (bytes_remaining > 3) {
  151.         i_bits = AV_RB32(in);
  152.         in += 3; bytes_remaining -= 3;
  153.         *dst++ = b64[ i_bits>>26        ];
  154.         *dst++ = b64[(i_bits>>20) & 0x3F];
  155.         *dst++ = b64[(i_bits>>14) & 0x3F];
  156.         *dst++ = b64[(i_bits>>8 ) & 0x3F];
  157.     }
  158.     i_bits = 0;
  159.     while (bytes_remaining) {
  160.         i_bits = (i_bits << 8) + *in++;
  161.         bytes_remaining--;
  162.         i_shift += 8;
  163.     }
  164.     while (i_shift > 0) {
  165.         *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
  166.         i_shift -= 6;
  167.     }
  168.     while ((dst - ret) & 3)
  169.         *dst++ = '=';
  170.     *dst = '\0';
  171.  
  172.     return ret;
  173. }
  174.  
  175. #ifdef TEST
  176. // LCOV_EXCL_START
  177.  
  178. #define MAX_DATA_SIZE    1024
  179. #define MAX_ENCODED_SIZE 2048
  180.  
  181. static int test_encode_decode(const uint8_t *data, unsigned int data_size,
  182.                               const char *encoded_ref)
  183. {
  184.     char  encoded[MAX_ENCODED_SIZE];
  185.     uint8_t data2[MAX_DATA_SIZE];
  186.     int data2_size, max_data2_size = MAX_DATA_SIZE;
  187.  
  188.     if (!av_base64_encode(encoded, MAX_ENCODED_SIZE, data, data_size)) {
  189.         printf("Failed: cannot encode the input data\n");
  190.         return 1;
  191.     }
  192.     if (encoded_ref && strcmp(encoded, encoded_ref)) {
  193.         printf("Failed: encoded string differs from reference\n"
  194.                "Encoded:\n%s\nReference:\n%s\n", encoded, encoded_ref);
  195.         return 1;
  196.     }
  197.  
  198.     if ((data2_size = av_base64_decode(data2, encoded, max_data2_size)) != data_size) {
  199.         printf("Failed: cannot decode the encoded string\n"
  200.                "Encoded:\n%s\n", encoded);
  201.         return 1;
  202.     }
  203.     if ((data2_size = av_base64_decode(data2, encoded, data_size)) != data_size) {
  204.         printf("Failed: cannot decode with minimal buffer\n"
  205.                "Encoded:\n%s\n", encoded);
  206.         return 1;
  207.     }
  208.     if (memcmp(data2, data, data_size)) {
  209.         printf("Failed: encoded/decoded data differs from original data\n");
  210.         return 1;
  211.     }
  212.     if (av_base64_decode(NULL, encoded, 0) != 0) {
  213.         printf("Failed: decode to NULL buffer\n");
  214.         return 1;
  215.     }
  216.     if (strlen(encoded)) {
  217.         char *end = strchr(encoded, '=');
  218.         if (!end)
  219.             end = encoded + strlen(encoded) - 1;
  220.         *end = '%';
  221.         if (av_base64_decode(NULL, encoded, 0) >= 0) {
  222.             printf("Failed: error detection\n");
  223.             return 1;
  224.         }
  225.     }
  226.  
  227.     printf("Passed!\n");
  228.     return 0;
  229. }
  230.  
  231. int main(int argc, char ** argv)
  232. {
  233.     int i, error_count = 0;
  234.     struct test {
  235.         const uint8_t *data;
  236.         const char *encoded_ref;
  237.     } tests[] = {
  238.         { "",        ""},
  239.         { "1",       "MQ=="},
  240.         { "22",      "MjI="},
  241.         { "333",     "MzMz"},
  242.         { "4444",    "NDQ0NA=="},
  243.         { "55555",   "NTU1NTU="},
  244.         { "666666",  "NjY2NjY2"},
  245.         { "abc:def", "YWJjOmRlZg=="},
  246.     };
  247.     char in[1024], out[2048];
  248.  
  249.     printf("Encoding/decoding tests\n");
  250.     for (i = 0; i < FF_ARRAY_ELEMS(tests); i++)
  251.         error_count += test_encode_decode(tests[i].data, strlen(tests[i].data), tests[i].encoded_ref);
  252.  
  253.     if (argc>1 && !strcmp(argv[1], "-t")) {
  254.         memset(in, 123, sizeof(in));
  255.         for(i=0; i<10000; i++){
  256.             START_TIMER
  257.             av_base64_encode(out, sizeof(out), in, sizeof(in));
  258.             STOP_TIMER("encode")
  259.         }
  260.         for(i=0; i<10000; i++){
  261.             START_TIMER
  262.             av_base64_decode(in, out, sizeof(in));
  263.             STOP_TIMER("decode")
  264.         }
  265.  
  266.         for(i=0; i<10000; i++){
  267.             START_TIMER
  268.             av_base64_decode(NULL, out, 0);
  269.             STOP_TIMER("syntax check")
  270.         }
  271.     }
  272.  
  273.     if (error_count)
  274.         printf("Error Count: %d.\n", error_count);
  275.  
  276.     return !!error_count;
  277. }
  278.  
  279. // LCOV_EXCL_STOP
  280. #endif
  281.