1/* 2 * Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com) 3 * 4 * This file is part of Libav. 5 * 6 * Libav 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 * Libav 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 Libav; 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 30/* ---------------- private code */ 31static const uint8_t map2[] = 32{ 33 0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36, 34 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 35 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 36 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 37 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 38 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 39 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b, 40 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 41 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 42 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33 43}; 44 45int av_base64_decode(uint8_t *out, const char *in, int out_size) 46{ 47 int i, v; 48 uint8_t *dst = out; 49 50 v = 0; 51 for (i = 0; in[i] && in[i] != '='; i++) { 52 unsigned int index= in[i]-43; 53 if (index>=FF_ARRAY_ELEMS(map2) || map2[index] == 0xff) 54 return -1; 55 v = (v << 6) + map2[index]; 56 if (i & 3) { 57 if (dst - out < out_size) { 58 *dst++ = v >> (6 - 2 * (i & 3)); 59 } 60 } 61 } 62 63 return dst - out; 64} 65 66/***************************************************************************** 67* b64_encode: Stolen from VLC's http.c. 68* Simplified by Michael. 69* Fixed edge cases and made it work from data (vs. strings) by Ryan. 70*****************************************************************************/ 71 72char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size) 73{ 74 static const char b64[] = 75 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 76 char *ret, *dst; 77 unsigned i_bits = 0; 78 int i_shift = 0; 79 int bytes_remaining = in_size; 80 81 if (in_size >= UINT_MAX / 4 || 82 out_size < AV_BASE64_SIZE(in_size)) 83 return NULL; 84 ret = dst = out; 85 while (bytes_remaining) { 86 i_bits = (i_bits << 8) + *in++; 87 bytes_remaining--; 88 i_shift += 8; 89 90 do { 91 *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f]; 92 i_shift -= 6; 93 } while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0)); 94 } 95 while ((dst - ret) & 3) 96 *dst++ = '='; 97 *dst = '\0'; 98 99 return ret; 100} 101 102#ifdef TEST 103 104#undef printf 105 106#define MAX_DATA_SIZE 1024 107#define MAX_ENCODED_SIZE 2048 108 109static int test_encode_decode(const uint8_t *data, unsigned int data_size, 110 const char *encoded_ref) 111{ 112 char encoded[MAX_ENCODED_SIZE]; 113 uint8_t data2[MAX_DATA_SIZE]; 114 int data2_size, max_data2_size = MAX_DATA_SIZE; 115 116 if (!av_base64_encode(encoded, MAX_ENCODED_SIZE, data, data_size)) { 117 printf("Failed: cannot encode the input data\n"); 118 return 1; 119 } 120 if (encoded_ref && strcmp(encoded, encoded_ref)) { 121 printf("Failed: encoded string differs from reference\n" 122 "Encoded:\n%s\nReference:\n%s\n", encoded, encoded_ref); 123 return 1; 124 } 125 126 if ((data2_size = av_base64_decode(data2, encoded, max_data2_size)) < 0) { 127 printf("Failed: cannot decode the encoded string\n" 128 "Encoded:\n%s\n", encoded); 129 return 1; 130 } 131 if (memcmp(data2, data, data_size)) { 132 printf("Failed: encoded/decoded data differs from original data\n"); 133 return 1; 134 } 135 136 printf("Passed!\n"); 137 return 0; 138} 139 140int main(void) 141{ 142 int i, error_count = 0; 143 struct test { 144 const uint8_t *data; 145 const char *encoded_ref; 146 } tests[] = { 147 { "", ""}, 148 { "1", "MQ=="}, 149 { "22", "MjI="}, 150 { "333", "MzMz"}, 151 { "4444", "NDQ0NA=="}, 152 { "55555", "NTU1NTU="}, 153 { "666666", "NjY2NjY2"}, 154 { "abc:def", "YWJjOmRlZg=="}, 155 }; 156 157 printf("Encoding/decoding tests\n"); 158 for (i = 0; i < FF_ARRAY_ELEMS(tests); i++) 159 error_count += test_encode_decode(tests[i].data, strlen(tests[i].data), tests[i].encoded_ref); 160 161 return error_count; 162} 163 164#endif 165