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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 "webp/encode.h"
#include "webp/mux.h"
namespace {
const VP8CPUInfo default_VP8GetCPUInfo = VP8GetCPUInfo;
int AddFrame(WebPAnimEncoder** const enc,
const WebPAnimEncoderOptions& anim_config, int* const width,
int* const height, int timestamp_ms, const uint8_t data[],
size_t size, uint32_t* const bit_pos) {
if (enc == nullptr || width == nullptr || height == nullptr) {
fprintf(stderr, "NULL parameters.\n");
if (enc != nullptr) WebPAnimEncoderDelete(*enc);
abort();
}
// Init the source picture.
WebPPicture pic;
if (!WebPPictureInit(&pic)) {
fprintf(stderr, "WebPPictureInit failed.\n");
WebPAnimEncoderDelete(*enc);
abort();
}
pic.use_argb = Extract(1, data, size, bit_pos);
// Read the source picture.
if (!ExtractSourcePicture(&pic, data, size, bit_pos)) {
fprintf(stderr, "Can't read input image.\n");
WebPPictureFree(&pic);
abort();
}
// Crop and scale.
if (*enc == nullptr) { // First frame will set canvas width and height.
if (!ExtractAndCropOrScale(&pic, data, size, bit_pos)) {
fprintf(stderr, "ExtractAndCropOrScale failed.");
WebPPictureFree(&pic);
abort();
}
} else { // Other frames will be resized to the first frame's dimensions.
if (!WebPPictureRescale(&pic, *width, *height)) {
fprintf(stderr, "WebPPictureRescale failed. Size: %d,%d\n", *width,
*height);
WebPAnimEncoderDelete(*enc);
WebPPictureFree(&pic);
abort();
}
}
// Create encoder if it doesn't exist.
if (*enc == nullptr) {
*width = pic.width;
*height = pic.height;
*enc = WebPAnimEncoderNew(*width, *height, &anim_config);
if (*enc == nullptr) {
fprintf(stderr, "WebPAnimEncoderNew failed.\n");
WebPPictureFree(&pic);
abort();
}
}
// Create frame encoding config.
WebPConfig config;
if (!ExtractWebPConfig(&config, data, size, bit_pos)) {
fprintf(stderr, "ExtractWebPConfig failed.\n");
WebPAnimEncoderDelete(*enc);
WebPPictureFree(&pic);
abort();
}
// Skip slow settings on big images, it's likely to timeout.
if (pic.width * pic.height > 32 * 32) {
config.method = (config.method > 4) ? 4 : config.method;
config.quality = (config.quality > 99.0f) ? 99.0f : config.quality;
config.alpha_quality =
(config.alpha_quality > 99) ? 99 : config.alpha_quality;
}
// Encode.
if (!WebPAnimEncoderAdd(*enc, &pic, timestamp_ms, &config)) {
fprintf(stderr, "WebPEncode failed. Error code: %d\n", pic.error_code);
WebPAnimEncoderDelete(*enc);
WebPPictureFree(&pic);
abort();
}
WebPPictureFree(&pic);
return 1;
}
} // namespace
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* const data, size_t size) {
WebPAnimEncoder* enc = nullptr;
int width = 0, height = 0, timestamp_ms = 0;
uint32_t bit_pos = 0;
ExtractAndDisableOptimizations(default_VP8GetCPUInfo, data, size, &bit_pos);
// Extract a configuration from the packed bits.
WebPAnimEncoderOptions anim_config;
if (!WebPAnimEncoderOptionsInit(&anim_config)) {
fprintf(stderr, "WebPAnimEncoderOptionsInit failed.\n");
abort();
}
anim_config.minimize_size = Extract(1, data, size, &bit_pos);
anim_config.kmax = Extract(15, data, size, &bit_pos);
const int min_kmin = (anim_config.kmax > 1) ? (anim_config.kmax / 2) : 0;
const int max_kmin = (anim_config.kmax > 1) ? (anim_config.kmax - 1) : 0;
anim_config.kmin =
min_kmin + Extract((uint32_t)(max_kmin - min_kmin), data, size, &bit_pos);
anim_config.allow_mixed = Extract(1, data, size, &bit_pos);
anim_config.verbose = 0;
const int nb_frames = 1 + Extract(15, data, size, &bit_pos);
// For each frame.
for (int i = 0; i < nb_frames; ++i) {
if (!AddFrame(&enc, anim_config, &width, &height, timestamp_ms, data, size,
&bit_pos)) {
return 0;
}
timestamp_ms += (1 << (2 + Extract(15, data, size, &bit_pos))) +
Extract(1, data, size, &bit_pos); // [1..131073], arbitrary
}
// Assemble.
if (!WebPAnimEncoderAdd(enc, nullptr, timestamp_ms, nullptr)) {
fprintf(stderr, "Last WebPAnimEncoderAdd failed.");
WebPAnimEncoderDelete(enc);
abort();
}
WebPData webp_data;
WebPDataInit(&webp_data);
if (!WebPAnimEncoderAssemble(enc, &webp_data)) {
fprintf(stderr, "WebPAnimEncoderAssemble failed.");
WebPAnimEncoderDelete(enc);
WebPDataClear(&webp_data);
abort();
}
WebPAnimEncoderDelete(enc);
WebPDataClear(&webp_data);
return 0;
}
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