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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 <stdio.h>
#include <stdlib.h>
#include "./fuzz_utils.h"
#include "src/webp/decode.h"
#include "src/webp/encode.h"
namespace {
const VP8CPUInfo default_VP8GetCPUInfo = VP8GetCPUInfo;
} // namespace
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* const data, size_t size) {
uint32_t bit_pos = 0;
ExtractAndDisableOptimizations(default_VP8GetCPUInfo, data, size, &bit_pos);
// Init the source picture.
WebPPicture pic;
if (!WebPPictureInit(&pic)) {
fprintf(stderr, "WebPPictureInit failed.\n");
abort();
}
pic.use_argb = Extract(1, data, size, &bit_pos);
// Read the source picture.
if (!ExtractSourcePicture(&pic, data, size, &bit_pos)) {
const WebPEncodingError error_code = pic.error_code;
WebPPictureFree(&pic);
if (error_code == VP8_ENC_ERROR_OUT_OF_MEMORY) return 0;
fprintf(stderr, "Can't read input image. Error code: %d\n", error_code);
abort();
}
// Crop and scale.
if (!ExtractAndCropOrScale(&pic, data, size, &bit_pos)) {
const WebPEncodingError error_code = pic.error_code;
WebPPictureFree(&pic);
if (error_code == VP8_ENC_ERROR_OUT_OF_MEMORY) return 0;
fprintf(stderr, "ExtractAndCropOrScale failed. Error code: %d\n",
error_code);
abort();
}
// Extract a configuration from the packed bits.
WebPConfig config;
if (!ExtractWebPConfig(&config, data, size, &bit_pos)) {
fprintf(stderr, "ExtractWebPConfig failed.\n");
abort();
}
// Skip slow settings on big images, it's likely to timeout.
if (pic.width * pic.height > 32 * 32) {
if (config.lossless) {
if (config.quality > 99.0f && config.method >= 5) {
config.quality = 99.0f;
config.method = 5;
}
} else {
if (config.quality > 99.0f && config.method == 6) {
config.quality = 99.0f;
}
}
if (config.alpha_quality == 100 && config.method == 6) {
config.alpha_quality = 99;
}
}
// Encode.
WebPMemoryWriter memory_writer;
WebPMemoryWriterInit(&memory_writer);
pic.writer = WebPMemoryWrite;
pic.custom_ptr = &memory_writer;
if (!WebPEncode(&config, &pic)) {
const WebPEncodingError error_code = pic.error_code;
WebPMemoryWriterClear(&memory_writer);
WebPPictureFree(&pic);
if (error_code == VP8_ENC_ERROR_OUT_OF_MEMORY) return 0;
fprintf(stderr, "WebPEncode failed. Error code: %d\n", error_code);
abort();
}
// Try decoding the result.
int w, h;
const uint8_t* const out_data = memory_writer.mem;
const size_t out_size = memory_writer.size;
uint8_t* const rgba = WebPDecodeBGRA(out_data, out_size, &w, &h);
if (rgba == nullptr || w != pic.width || h != pic.height) {
fprintf(stderr, "WebPDecodeBGRA failed.\n");
WebPFree(rgba);
WebPMemoryWriterClear(&memory_writer);
WebPPictureFree(&pic);
abort();
}
// Compare the results if exact encoding.
if (pic.use_argb && config.lossless && config.near_lossless == 100) {
const uint32_t* src1 = (const uint32_t*)rgba;
const uint32_t* src2 = pic.argb;
for (int y = 0; y < h; ++y, src1 += w, src2 += pic.argb_stride) {
for (int x = 0; x < w; ++x) {
uint32_t v1 = src1[x], v2 = src2[x];
if (!config.exact) {
if ((v1 & 0xff000000u) == 0 || (v2 & 0xff000000u) == 0) {
// Only keep alpha for comparison of fully transparent area.
v1 &= 0xff000000u;
v2 &= 0xff000000u;
}
}
if (v1 != v2) {
fprintf(stderr, "Lossless compression failed pixel-exactness.\n");
WebPFree(rgba);
WebPMemoryWriterClear(&memory_writer);
WebPPictureFree(&pic);
abort();
}
}
}
}
WebPFree(rgba);
WebPMemoryWriterClear(&memory_writer);
WebPPictureFree(&pic);
return 0;
}
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