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ffmpeg / libavutil / base64.c @ 5d6e4c16

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/*
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 * Copyright (c) 2006 Ryan Martell. (rdm4@martellventures.com)
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * @brief Base64 encode/decode
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 * @author Ryan Martell <rdm4@martellventures.com> (with lots of Michael)
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 */
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#include "common.h"
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#include "base64.h"
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/* ---------------- private code */
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static const uint8_t map2[] =
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{
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    0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
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    0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
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    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01,
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    0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
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    0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
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    0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
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    0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
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    0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
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    0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
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};
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int av_base64_decode(uint8_t *out, const char *in, int out_size)
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{
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    int i, v;
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    uint8_t *dst = out;
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    v = 0;
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    for (i = 0; in[i] && in[i] != '='; i++) {
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        unsigned int index= in[i]-43;
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        if (index>=FF_ARRAY_ELEMS(map2) || map2[index] == 0xff)
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            return -1;
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        v = (v << 6) + map2[index];
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        if (i & 3) {
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            if (dst - out < out_size) {
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                *dst++ = v >> (6 - 2 * (i & 3));
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            }
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        }
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    }
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    return dst - out;
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}
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/*****************************************************************************
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* b64_encode: Stolen from VLC's http.c.
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* Simplified by Michael.
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* Fixed edge cases and made it work from data (vs. strings) by Ryan.
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*****************************************************************************/
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char *av_base64_encode(char *out, int out_size, const uint8_t *in, int in_size)
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{
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    static const char b64[] =
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        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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    char *ret, *dst;
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    unsigned i_bits = 0;
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    int i_shift = 0;
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    int bytes_remaining = in_size;
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    if (in_size >= UINT_MAX / 4 ||
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        out_size < AV_BASE64_SIZE(in_size))
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        return NULL;
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    ret = dst = out;
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    while (bytes_remaining) {
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        i_bits = (i_bits << 8) + *in++;
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        bytes_remaining--;
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        i_shift += 8;
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        do {
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            *dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
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            i_shift -= 6;
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        } while (i_shift > 6 || (bytes_remaining == 0 && i_shift > 0));
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    }
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    while ((dst - ret) & 3)
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        *dst++ = '=';
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    *dst = '\0';
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    return ret;
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}
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#ifdef TEST
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#undef printf
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#define MAX_DATA_SIZE    1024
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#define MAX_ENCODED_SIZE 2048
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static int test_encode_decode(const uint8_t *data, unsigned int data_size,
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                              const char *encoded_ref)
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{
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    char  encoded[MAX_ENCODED_SIZE];
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    uint8_t data2[MAX_DATA_SIZE];
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    int data2_size, max_data2_size = MAX_DATA_SIZE;
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    if (!av_base64_encode(encoded, MAX_ENCODED_SIZE, data, data_size)) {
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        printf("Failed: cannot encode the input data\n");
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        return 1;
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    }
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    if (encoded_ref && strcmp(encoded, encoded_ref)) {
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        printf("Failed: encoded string differs from reference\n"
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               "Encoded:\n%s\nReference:\n%s\n", encoded, encoded_ref);
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        return 1;
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    }
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    if ((data2_size = av_base64_decode(data2, encoded, max_data2_size)) < 0) {
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        printf("Failed: cannot decode the encoded string\n"
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               "Encoded:\n%s\n", encoded);
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        return 1;
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    }
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    if (memcmp(data2, data, data_size)) {
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        printf("Failed: encoded/decoded data differs from original data\n");
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        return 1;
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    }
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    printf("Passed!\n");
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    return 0;
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}
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int main(void)
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{
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    int i, error_count = 0;
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    struct test {
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        const uint8_t *data;
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        const char *encoded_ref;
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    } tests[] = {
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        { "",        ""},
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        { "1",       "MQ=="},
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        { "22",      "MjI="},
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        { "333",     "MzMz"},
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        { "4444",    "NDQ0NA=="},
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        { "55555",   "NTU1NTU="},
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        { "666666",  "NjY2NjY2"},
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        { "abc:def", "YWJjOmRlZg=="},
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    };
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    printf("Encoding/decoding tests\n");
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    for (i = 0; i < FF_ARRAY_ELEMS(tests); i++)
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        error_count += test_encode_decode(tests[i].data, strlen(tests[i].data), tests[i].encoded_ref);
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    return error_count;
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}
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#endif