mirror of https://github.com/google/oss-fuzz.git
79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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////////////////////////////////////////////////////////////////////////////////
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#include "fuzz.h"
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#include "webp/decode.h"
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#include "webp/demux.h"
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#include "webp/mux_types.h"
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int LLVMFuzzerTestOneInput(const uint8_t* const data, size_t size) {
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WebPData webp_data;
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WebPDataInit(&webp_data);
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webp_data.size = size;
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webp_data.bytes = data;
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// WebPAnimDecoderNew uses WebPDemux internally to calloc canvas size.
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WebPDemuxer* const demux = WebPDemux(&webp_data);
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if (!demux) return 0;
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const uint32_t cw = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
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const uint32_t ch = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
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if ((size_t)cw * ch > kFuzzPxLimit) {
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WebPDemuxDelete(demux);
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return 0;
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}
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// In addition to canvas size, check each frame separately.
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WebPIterator iter;
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for (int i = 0; i < kFuzzFrameLimit; i++) {
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if (!WebPDemuxGetFrame(demux, i + 1, &iter)) break;
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int w, h;
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if (WebPGetInfo(iter.fragment.bytes, iter.fragment.size, &w, &h)) {
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if ((size_t)w * h > kFuzzPxLimit) { // image size of the frame payload
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WebPDemuxReleaseIterator(&iter);
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WebPDemuxDelete(demux);
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return 0;
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}
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}
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}
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WebPDemuxReleaseIterator(&iter);
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WebPDemuxDelete(demux);
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WebPAnimDecoderOptions dec_options;
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if (!WebPAnimDecoderOptionsInit(&dec_options)) return 0;
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dec_options.use_threads = size & 1;
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// Animations only support 4 (of 12) modes.
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dec_options.color_mode = (WEBP_CSP_MODE)(size % MODE_LAST);
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if (dec_options.color_mode != MODE_BGRA &&
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dec_options.color_mode != MODE_rgbA &&
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dec_options.color_mode != MODE_bgrA) {
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dec_options.color_mode = MODE_RGBA;
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}
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WebPAnimDecoder* dec = WebPAnimDecoderNew(&webp_data, &dec_options);
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if (!dec) return 0;
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for (int i = 0; i < kFuzzFrameLimit; i++) {
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uint8_t* buf;
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int timestamp;
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if (!WebPAnimDecoderGetNext(dec, &buf, ×tamp)) break;
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}
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WebPAnimDecoderDelete(dec);
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return 0;
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}
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