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// Copyright 2018 Google Inc.
//
// 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 "./fuzz_utils.h"
#include "webp/demux.h"
#include "webp/mux.h"
int LLVMFuzzerTestOneInput(const uint8_t* const data, size_t size) {
WebPData webp_data;
WebPDataInit(&webp_data);
webp_data.size = size;
webp_data.bytes = data;
// Extracted chunks and frames are not processed or decoded,
// which is already covered extensively by the other fuzz targets.
if (size & 1) {
// Mux API
WebPMux* mux = WebPMuxCreate(&webp_data, size & 2);
if (!mux) return 0;
WebPData chunk;
WebPMuxGetChunk(mux, "EXIF", &chunk);
WebPMuxGetChunk(mux, "ICCP", &chunk);
WebPMuxGetChunk(mux, "FUZZ", &chunk); // unknown
uint32_t flags;
WebPMuxGetFeatures(mux, &flags);
WebPMuxAnimParams params;
WebPMuxGetAnimationParams(mux, &params);
WebPMuxError status;
WebPMuxFrameInfo info;
for (int i = 0; i < kFuzzFrameLimit; i++) {
status = WebPMuxGetFrame(mux, i + 1, &info);
if (status == WEBP_MUX_NOT_FOUND) {
break;
} else if (status == WEBP_MUX_OK) {
WebPDataClear(&info.bitstream);
}
}
WebPMuxDelete(mux);
} else {
// Demux API
WebPDemuxer* demux;
if (size & 2) {
WebPDemuxState state;
demux = WebPDemuxPartial(&webp_data, &state);
if (state < WEBP_DEMUX_PARSED_HEADER) {
WebPDemuxDelete(demux);
return 0;
}
} else {
demux = WebPDemux(&webp_data);
if (!demux) return 0;
}
WebPChunkIterator chunk_iter;
if (WebPDemuxGetChunk(demux, "EXIF", 1, &chunk_iter)) {
WebPDemuxNextChunk(&chunk_iter);
}
WebPDemuxReleaseChunkIterator(&chunk_iter);
if (WebPDemuxGetChunk(demux, "ICCP", 0, &chunk_iter)) { // 0 == last
WebPDemuxPrevChunk(&chunk_iter);
}
WebPDemuxReleaseChunkIterator(&chunk_iter);
// Skips FUZZ because the Demux API has no concept of (un)known chunks.
WebPIterator iter;
if (WebPDemuxGetFrame(demux, 1, &iter)) {
for (int i = 1; i < kFuzzFrameLimit; i++) {
if (!WebPDemuxNextFrame(&iter)) break;
}
}
WebPDemuxReleaseIterator(&iter);
WebPDemuxDelete(demux);
}
return 0;
}