LCOV - code coverage report
Current view: top level - src/libavutil - base64.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 63 64 98.4 %
Date: 2017-01-21 09:32:20 Functions: 2 2 100.0 %

          Line data    Source code
       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             : #include "timer.h"
      31             : 
      32             : /* ---------------- private code */
      33             : static const uint8_t map2[256] =
      34             : {
      35             :     0xfe, 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, 0xff, 0xff, 0xff, 0xff, 0xff,
      40             :     0xff, 0xff, 0xff,
      41             : 
      42             :     0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
      43             :     0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
      44             :     0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0x00, 0x01,
      45             :     0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
      46             :     0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
      47             :     0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
      48             :     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
      49             :     0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
      50             :     0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
      51             :     0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33,
      52             : 
      53             :                       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             :     0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
      70             : };
      71             : 
      72             : #define BASE64_DEC_STEP(i) do { \
      73             :     bits = map2[in[i]]; \
      74             :     if (bits & 0x80) \
      75             :         goto out ## i; \
      76             :     v = i ? (v << 6) + bits : bits; \
      77             : } while(0)
      78             : 
      79          48 : int av_base64_decode(uint8_t *out, const char *in_str, int out_size)
      80             : {
      81          48 :     uint8_t *dst = out;
      82          48 :     uint8_t *end = out + out_size;
      83             :     // no sign extension
      84          48 :     const uint8_t *in = in_str;
      85          48 :     unsigned bits = 0xff;
      86             :     unsigned v;
      87             : 
      88       23399 :     while (end - dst > 3) {
      89       23311 :         BASE64_DEC_STEP(0);
      90       23308 :         BASE64_DEC_STEP(1);
      91       23308 :         BASE64_DEC_STEP(2);
      92       23305 :         BASE64_DEC_STEP(3);
      93             :         // Using AV_WB32 directly confuses compiler
      94       23303 :         v = av_be2ne32(v << 8);
      95       23303 :         AV_WN32(dst, v);
      96       23303 :         dst += 3;
      97       23303 :         in += 4;
      98             :     }
      99          40 :     if (end - dst) {
     100          24 :         BASE64_DEC_STEP(0);
     101          24 :         BASE64_DEC_STEP(1);
     102          24 :         BASE64_DEC_STEP(2);
     103          20 :         BASE64_DEC_STEP(3);
     104          17 :         *dst++ = v >> 16;
     105          17 :         if (end - dst)
     106          17 :             *dst++ = v >> 8;
     107          17 :         if (end - dst)
     108          17 :             *dst++ = v;
     109          17 :         in += 4;
     110             :     }
     111             :     while (1) {
     112          57 :         BASE64_DEC_STEP(0);
     113          24 :         in++;
     114          24 :         BASE64_DEC_STEP(0);
     115          24 :         in++;
     116          24 :         BASE64_DEC_STEP(0);
     117          18 :         in++;
     118          18 :         BASE64_DEC_STEP(0);
     119          12 :         in++;
     120             :     }
     121             : 
     122             : out3:
     123           5 :     *dst++ = v >> 10;
     124           5 :     v <<= 2;
     125             : out2:
     126          12 :     *dst++ = v >> 4;
     127             : out1:
     128             : out0:
     129          48 :     return bits & 1 ? AVERROR_INVALIDDATA : dst - out;
     130             : }
     131             : 
     132             : /*****************************************************************************
     133             : * b64_encode: Stolen from VLC's http.c.
     134             : * Simplified by Michael.
     135             : * Fixed edge cases and made it work from data (vs. strings) by Ryan.
     136             : *****************************************************************************/
     137             : 
     138          23 : char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
     139             : {
     140             :     static const char b64[] =
     141             :         "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
     142             :     char *ret, *dst;
     143          23 :     unsigned i_bits = 0;
     144          23 :     int i_shift = 0;
     145          23 :     int bytes_remaining = in_size;
     146             : 
     147          46 :     if (in_size >= UINT_MAX / 4 ||
     148          23 :         out_size < AV_BASE64_SIZE(in_size))
     149           0 :         return NULL;
     150          23 :     ret = dst = out;
     151         177 :     while (bytes_remaining > 3) {
     152         131 :         i_bits = AV_RB32(in);
     153         131 :         in += 3; bytes_remaining -= 3;
     154         131 :         *dst++ = b64[ i_bits>>26        ];
     155         131 :         *dst++ = b64[(i_bits>>20) & 0x3F];
     156         131 :         *dst++ = b64[(i_bits>>14) & 0x3F];
     157         131 :         *dst++ = b64[(i_bits>>8 ) & 0x3F];
     158             :     }
     159          23 :     i_bits = 0;
     160          81 :     while (bytes_remaining) {
     161          35 :         i_bits = (i_bits << 8) + *in++;
     162          35 :         bytes_remaining--;
     163          35 :         i_shift += 8;
     164             :     }
     165         103 :     while (i_shift > 0) {
     166          57 :         *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
     167          57 :         i_shift -= 6;
     168             :     }
     169          77 :     while ((dst - ret) & 3)
     170          31 :         *dst++ = '=';
     171          23 :     *dst = '\0';
     172             : 
     173          23 :     return ret;
     174             : }

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