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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/decode.h"
#include "webp/demux.h"
#include "webp/mux_types.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;
// WebPAnimDecoderNew uses WebPDemux internally to calloc canvas size.
WebPDemuxer* const demux = WebPDemux(&webp_data);
if (!demux) return 0;
const uint32_t cw = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
const uint32_t ch = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
if ((size_t)cw * ch > kFuzzPxLimit) {
WebPDemuxDelete(demux);
return 0;
}
// In addition to canvas size, check each frame separately.
WebPIterator iter;
for (int i = 0; i < kFuzzFrameLimit; i++) {
if (!WebPDemuxGetFrame(demux, i + 1, &iter)) break;
int w, h;
if (WebPGetInfo(iter.fragment.bytes, iter.fragment.size, &w, &h)) {
if ((size_t)w * h > kFuzzPxLimit) { // image size of the frame payload
WebPDemuxReleaseIterator(&iter);
WebPDemuxDelete(demux);
return 0;
}
}
}
WebPDemuxReleaseIterator(&iter);
WebPDemuxDelete(demux);
WebPAnimDecoderOptions dec_options;
if (!WebPAnimDecoderOptionsInit(&dec_options)) return 0;
dec_options.use_threads = size & 1;
// Animations only support 4 (of 12) modes.
dec_options.color_mode = (WEBP_CSP_MODE)(size % MODE_LAST);
if (dec_options.color_mode != MODE_BGRA &&
dec_options.color_mode != MODE_rgbA &&
dec_options.color_mode != MODE_bgrA) {
dec_options.color_mode = MODE_RGBA;
}
WebPAnimDecoder* dec = WebPAnimDecoderNew(&webp_data, &dec_options);
if (!dec) return 0;
for (int i = 0; i < kFuzzFrameLimit; i++) {
uint8_t* buf;
int timestamp;
if (!WebPAnimDecoderGetNext(dec, &buf, &timestamp)) break;
}
WebPAnimDecoderDelete(dec);
return 0;
}