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135 lines
4.0 KiB
135 lines
4.0 KiB
// 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 <stdio.h>
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#include <stdlib.h>
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#include "./fuzz_utils.h"
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#include "webp/decode.h"
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#include "webp/encode.h"
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namespace {
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const VP8CPUInfo default_VP8GetCPUInfo = VP8GetCPUInfo;
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} // namespace
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t* const data, size_t size) {
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uint32_t bit_pos = 0;
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ExtractAndDisableOptimizations(default_VP8GetCPUInfo, data, size, &bit_pos);
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// Init the source picture.
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WebPPicture pic;
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if (!WebPPictureInit(&pic)) {
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fprintf(stderr, "WebPPictureInit failed.\n");
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abort();
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}
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pic.use_argb = Extract(1, data, size, &bit_pos);
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// Read the source picture.
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if (!ExtractSourcePicture(&pic, data, size, &bit_pos)) {
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fprintf(stderr, "Can't read input image.\n");
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WebPPictureFree(&pic);
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abort();
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}
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// Crop and scale.
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if (!ExtractAndCropOrScale(&pic, data, size, &bit_pos)) {
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fprintf(stderr, "ExtractAndCropOrScale failed.");
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WebPPictureFree(&pic);
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abort();
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}
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// Extract a configuration from the packed bits.
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WebPConfig config;
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if (!ExtractWebPConfig(&config, data, size, &bit_pos)) {
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fprintf(stderr, "ExtractWebPConfig failed.\n");
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abort();
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}
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// Skip slow settings on big images, it's likely to timeout.
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if (pic.width * pic.height > 32 * 32) {
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if (config.lossless) {
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if (config.quality > 99.0f && config.method >= 5) {
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config.quality = 99.0f;
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config.method = 5;
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}
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} else {
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if (config.quality > 99.0f && config.method == 6) {
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config.quality = 99.0f;
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}
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}
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if (config.alpha_quality == 100 && config.method == 6) {
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config.alpha_quality = 99;
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}
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}
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// Encode.
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WebPMemoryWriter memory_writer;
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WebPMemoryWriterInit(&memory_writer);
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pic.writer = WebPMemoryWrite;
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pic.custom_ptr = &memory_writer;
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if (!WebPEncode(&config, &pic)) {
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fprintf(stderr, "WebPEncode failed. Error code: %d\n", pic.error_code);
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WebPMemoryWriterClear(&memory_writer);
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WebPPictureFree(&pic);
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abort();
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}
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// Try decoding the result.
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int w, h;
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const uint8_t* const out_data = memory_writer.mem;
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const size_t out_size = memory_writer.size;
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uint8_t* const rgba = WebPDecodeBGRA(out_data, out_size, &w, &h);
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if (rgba == nullptr || w != pic.width || h != pic.height) {
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fprintf(stderr, "WebPDecodeBGRA failed.\n");
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WebPFree(rgba);
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WebPMemoryWriterClear(&memory_writer);
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WebPPictureFree(&pic);
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abort();
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}
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// Compare the results if exact encoding.
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if (pic.use_argb && config.lossless && config.near_lossless == 100) {
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const uint32_t* src1 = (const uint32_t*)rgba;
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const uint32_t* src2 = pic.argb;
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for (int y = 0; y < h; ++y, src1 += w, src2 += pic.argb_stride) {
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for (int x = 0; x < w; ++x) {
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uint32_t v1 = src1[x], v2 = src2[x];
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if (!config.exact) {
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if ((v1 & 0xff000000u) == 0 || (v2 & 0xff000000u) == 0) {
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// Only keep alpha for comparison of fully transparent area.
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v1 &= 0xff000000u;
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v2 &= 0xff000000u;
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}
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}
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if (v1 != v2) {
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fprintf(stderr, "Lossless compression failed pixel-exactness.\n");
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WebPFree(rgba);
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WebPMemoryWriterClear(&memory_writer);
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WebPPictureFree(&pic);
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abort();
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}
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}
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}
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}
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WebPFree(rgba);
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WebPMemoryWriterClear(&memory_writer);
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WebPPictureFree(&pic);
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return 0;
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}
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