add mkvparser_fuzzer.cc
this isn't hooked up to cmake, but can be built similarly to webm_parser
webm_fuzzer.cc
PiperOrigin-RevId: 415639383
PiperOrigin-RevId: 416349966
Change-Id: I89b744e129442321a15b623ebc04811ca629d5b6
diff --git a/testing/mkvparser_fuzzer.cc b/testing/mkvparser_fuzzer.cc
new file mode 100644
index 0000000..a1a47b8
--- /dev/null
+++ b/testing/mkvparser_fuzzer.cc
@@ -0,0 +1,111 @@
+// 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 <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();
+ }
+}
+
+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;
+ }
+
+ const mkvparser::Cluster* cluster = segment->GetFirst();
+ while (cluster != nullptr && !cluster->EOS()) {
+ ParseCluster(*cluster);
+ cluster = segment->GetNext(cluster);
+ }
+ ParseCues(*segment);
+
+ return 0;
+}
