forked from KolibriOS/kolibrios
281 lines
8.3 KiB
C
281 lines
8.3 KiB
C
/*
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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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#include "intreadwrite.h"
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/* ---------------- private code */
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static const uint8_t map2[256] =
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{
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0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff,
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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, 0xfe, 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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0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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};
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#define BASE64_DEC_STEP(i) do { \
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bits = map2[in[i]]; \
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if (bits & 0x80) \
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goto out ## i; \
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v = i ? (v << 6) + bits : bits; \
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} while(0)
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int av_base64_decode(uint8_t *out, const char *in_str, int out_size)
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{
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uint8_t *dst = out;
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uint8_t *end = out + out_size;
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// no sign extension
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const uint8_t *in = in_str;
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unsigned bits = 0xff;
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unsigned v;
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while (end - dst > 3) {
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BASE64_DEC_STEP(0);
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BASE64_DEC_STEP(1);
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BASE64_DEC_STEP(2);
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BASE64_DEC_STEP(3);
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// Using AV_WB32 directly confuses compiler
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v = av_be2ne32(v << 8);
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AV_WN32(dst, v);
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dst += 3;
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in += 4;
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}
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if (end - dst) {
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BASE64_DEC_STEP(0);
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BASE64_DEC_STEP(1);
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BASE64_DEC_STEP(2);
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BASE64_DEC_STEP(3);
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*dst++ = v >> 16;
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if (end - dst)
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*dst++ = v >> 8;
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if (end - dst)
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*dst++ = v;
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in += 4;
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}
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while (1) {
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BASE64_DEC_STEP(0);
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in++;
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BASE64_DEC_STEP(0);
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in++;
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BASE64_DEC_STEP(0);
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in++;
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BASE64_DEC_STEP(0);
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in++;
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}
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out3:
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*dst++ = v >> 10;
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v <<= 2;
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out2:
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*dst++ = v >> 4;
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out1:
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out0:
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return bits & 1 ? AVERROR_INVALIDDATA : 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 > 3) {
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i_bits = AV_RB32(in);
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in += 3; bytes_remaining -= 3;
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*dst++ = b64[ i_bits>>26 ];
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*dst++ = b64[(i_bits>>20) & 0x3F];
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*dst++ = b64[(i_bits>>14) & 0x3F];
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*dst++ = b64[(i_bits>>8 ) & 0x3F];
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}
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i_bits = 0;
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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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}
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while (i_shift > 0) {
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*dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
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i_shift -= 6;
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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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// LCOV_EXCL_START
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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)) != data_size) {
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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 ((data2_size = av_base64_decode(data2, encoded, data_size)) != data_size) {
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printf("Failed: cannot decode with minimal buffer\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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if (av_base64_decode(NULL, encoded, 0) != 0) {
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printf("Failed: decode to NULL buffer\n");
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return 1;
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}
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if (strlen(encoded)) {
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char *end = strchr(encoded, '=');
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if (!end)
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end = encoded + strlen(encoded) - 1;
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*end = '%';
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if (av_base64_decode(NULL, encoded, 0) >= 0) {
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printf("Failed: error detection\n");
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return 1;
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}
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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(int argc, char ** argv)
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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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char in[1024], out[2048];
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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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if (argc>1 && !strcmp(argv[1], "-t")) {
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memset(in, 123, sizeof(in));
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for(i=0; i<10000; i++){
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START_TIMER
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av_base64_encode(out, sizeof(out), in, sizeof(in));
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STOP_TIMER("encode")
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}
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for(i=0; i<10000; i++){
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START_TIMER
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av_base64_decode(in, out, sizeof(in));
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STOP_TIMER("decode")
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}
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for(i=0; i<10000; i++){
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START_TIMER
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av_base64_decode(NULL, out, 0);
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STOP_TIMER("syntax check")
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}
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}
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if (error_count)
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printf("Error Count: %d.\n", error_count);
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return !!error_count;
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}
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// LCOV_EXCL_STOP
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#endif
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