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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "opusfile/config.h"
#include "opusfile/include/opusfile.h"
// Opusfile fuzzing wrapper to help with automated fuzz testing. It's based on
// https://github.com/xiph/opusfile/blob/master/examples/opusfile_example.c
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
int ret, tmp;
OggOpusFile *of = op_open_memory(data, size, &ret);
if (!of)
return 0;
op_link_count(of);
int link_index = -1;
op_pcm_total(of, link_index);
op_raw_total(of, link_index);
op_pcm_tell(of);
op_raw_tell(of);
ogg_int64_t total_sample_count = 0;
const int pcm_size = 120 * 48 * 2; // 120ms/ch@48kHz is recommended
opus_int16 pcm[pcm_size];
for (;;) {
ret = op_read_stereo(of, pcm, pcm_size);
if (ret < 0) {
break;
}
if (op_current_link(of) != link_index) {
link_index = op_current_link(of);
op_pcm_total(of, link_index);
op_raw_total(of, link_index);
op_pcm_tell(of);
op_raw_tell(of);
op_bitrate_instant(of);
tmp = op_head(of, link_index)->version;
const OpusTags *tags = op_tags(of, link_index);
for (int i = 0; i < tags->comments; ++i) {
// Note: The compare also touches memory allocated for user_comments[i].
// This is a desired side effect and should be kept even if this
// comparison is removed.
if (opus_tagncompare("METADATA_BLOCK_PICTURE", 22,
tags->user_comments[i]) == 0) {
OpusPictureTag pic;
if (opus_picture_tag_parse(&pic, tags->user_comments[i]) >= 0) {
opus_picture_tag_clear(&pic);
}
}
}
if (tags->vendor) {
tmp = tags->vendor[0];
}
int binary_suffix_len;
opus_tags_get_binary_suffix(tags, &binary_suffix_len);
}
if (ret == 0) {
break;
}
total_sample_count += ret;
}
if (total_sample_count > 0) {
// Try random-access PCM reads. The number of tests is arbitrary and the
// offset is designed to be pseudo-random, but deterministic - this is
// implemented using Lehmer RNG with a minor hack that probably breaks some
// properties of the RNG (but that is acceptable).
ogg_int64_t rng_seed = 1307832949LL;
for (int i = 0; i < 32; ++i) {
// Derive the next deterministic offset to test and iterate the RNG.
rng_seed = (rng_seed * 279470273LL);
const ogg_int64_t offset = rng_seed % total_sample_count;
rng_seed = rng_seed % 4294967291LL;
if (op_pcm_seek(of, offset) == 0) {
tmp = op_read_stereo(of, pcm, pcm_size);
}
}
}
op_free(of);
return 0;
}
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