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// Copyright (c) 2022 The WebM project authors. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <memory>
#include <new>
#include "mkvparser/mkvparser.h"
#include "mkvparser/mkvreader.h"
namespace {
class MemoryReader : public mkvparser::IMkvReader {
public:
MemoryReader(const uint8_t* data, size_t size) : data_(data), size_(size) {}
int Read(long long pos, long len, unsigned char* buf) override {
if (pos < 0 || len < 0) {
abort();
}
if (pos >= size_ || size_ - pos < len) {
return -1;
}
memcpy(buf, data_ + pos, len);
return 0;
}
int Length(long long* total, long long* available) override {
if (total != nullptr) {
*total = size_;
}
if (available != nullptr) {
*available = size_;
}
return 0;
}
private:
const uint8_t* data_;
size_t size_;
};
void ParseCues(const mkvparser::Segment& segment) {
const mkvparser::Cues* const cues = segment.GetCues();
if (cues == nullptr) {
return;
}
while (!cues->DoneParsing()) {
cues->LoadCuePoint();
}
}
const mkvparser::BlockEntry* GetBlockEntryFromCues(
const void* ctx, const mkvparser::CuePoint* cue,
const mkvparser::CuePoint::TrackPosition* track_pos) {
const auto* const cues = static_cast<const mkvparser::Cues*>(ctx);
return cues->GetBlock(cue, track_pos);
}
const mkvparser::BlockEntry* GetBlockEntryFromCluster(
const void* ctx, const mkvparser::CuePoint* cue,
const mkvparser::CuePoint::TrackPosition* track_pos) {
if (track_pos == nullptr) {
return nullptr;
}
const auto* const cluster = static_cast<const mkvparser::Cluster*>(ctx);
const mkvparser::BlockEntry* block_entry =
cluster->GetEntry(*cue, *track_pos);
return block_entry;
}
void WalkCues(const mkvparser::Segment& segment,
std::function<const mkvparser::BlockEntry*(
const void*, const mkvparser::CuePoint*,
const mkvparser::CuePoint::TrackPosition*)>
get_block_entry,
const void* ctx) {
const mkvparser::Cues* const cues = segment.GetCues();
const mkvparser::Tracks* tracks = segment.GetTracks();
if (cues == nullptr || tracks == nullptr) {
return;
}
const unsigned long num_tracks = tracks->GetTracksCount();
for (const mkvparser::CuePoint* cue = cues->GetFirst(); cue != nullptr;
cue = cues->GetNext(cue)) {
for (unsigned long track_num = 0; track_num < num_tracks; ++track_num) {
const mkvparser::Track* const track = tracks->GetTrackByIndex(track_num);
const mkvparser::CuePoint::TrackPosition* const track_pos =
cue->Find(track);
const mkvparser::BlockEntry* block_entry =
get_block_entry(ctx, cue, track_pos);
static_cast<void>(block_entry);
}
}
}
void ParseCluster(const mkvparser::Cluster& cluster) {
const mkvparser::BlockEntry* block_entry;
long status = cluster.GetFirst(block_entry);
if (status != 0) {
return;
}
while (block_entry != nullptr && !block_entry->EOS()) {
const mkvparser::Block* const block = block_entry->GetBlock();
if (block == nullptr) {
return;
}
status = cluster.GetNext(block_entry, block_entry);
if (status != 0) {
return;
}
}
}
} // namespace
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
MemoryReader reader(data, size);
long long int pos = 0;
std::unique_ptr<mkvparser::EBMLHeader> ebml_header(
new (std::nothrow) mkvparser::EBMLHeader()); // NOLINT
if (ebml_header->Parse(&reader, pos) < 0) {
return 0;
}
mkvparser::Segment* temp_segment;
if (mkvparser::Segment::CreateInstance(&reader, pos, temp_segment) != 0) {
return 0;
}
std::unique_ptr<mkvparser::Segment> segment(temp_segment);
if (segment->Load() < 0) {
return 0;
}
ParseCues(*segment);
WalkCues(*segment, GetBlockEntryFromCues, segment->GetCues());
const mkvparser::Cluster* cluster = segment->GetFirst();
while (cluster != nullptr && !cluster->EOS()) {
ParseCluster(*cluster);
WalkCues(*segment, GetBlockEntryFromCluster, cluster);
cluster = segment->GetNext(cluster);
}
return 0;
}
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