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Diffstat (limited to 'tests/fuzzer/advanced_api_fuzzer.c')
-rw-r--r-- | tests/fuzzer/advanced_api_fuzzer.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/tests/fuzzer/advanced_api_fuzzer.c b/tests/fuzzer/advanced_api_fuzzer.c new file mode 100644 index 00000000..da4613bb --- /dev/null +++ b/tests/fuzzer/advanced_api_fuzzer.c @@ -0,0 +1,97 @@ +// 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" + +int LLVMFuzzerTestOneInput(const uint8_t* const data, size_t size) { + WebPDecoderConfig config; + if (!WebPInitDecoderConfig(&config)) return 0; + if (WebPGetFeatures(data, size, &config.input) != VP8_STATUS_OK) return 0; + if ((size_t)config.input.width * config.input.height > kFuzzPxLimit) return 0; + + // Using two independent criteria ensures that all combinations of options + // can reach each path at the decoding stage, with meaningful differences. + + const uint8_t value = FuzzHash(data, size); + const float factor = value / 255.f; // 0-1 + + config.options.flip = value & 1; + config.options.bypass_filtering = value & 2; + config.options.no_fancy_upsampling = value & 4; + config.options.use_threads = value & 8; + if (size & 1) { + config.options.use_cropping = 1; + config.options.crop_width = (int)(config.input.width * (1 - factor)); + config.options.crop_height = (int)(config.input.height * (1 - factor)); + config.options.crop_left = config.input.width - config.options.crop_width; + config.options.crop_top = config.input.height - config.options.crop_height; + } + if (size & 2) { + int strength = (int)(factor * 100); + config.options.dithering_strength = strength; + config.options.alpha_dithering_strength = 100 - strength; + } + if (size & 4) { + config.options.use_scaling = 1; + config.options.scaled_width = (int)(config.input.width * factor * 2); + config.options.scaled_height = (int)(config.input.height * factor * 2); + } + +#if defined(WEBP_REDUCE_CSP) + config.output.colorspace = (value & 1) + ? ((value & 2) ? MODE_RGBA : MODE_BGRA) + : ((value & 2) ? MODE_rgbA : MODE_bgrA); +#else + config.output.colorspace = (WEBP_CSP_MODE)(value % MODE_LAST); +#endif // WEBP_REDUCE_CSP + + if (size % 3) { + // Decodes incrementally in chunks of increasing size. + WebPIDecoder* idec = WebPIDecode(NULL, 0, &config); + if (!idec) return 0; + VP8StatusCode status; + if (size & 8) { + size_t available_size = value + 1; + while (1) { + if (available_size > size) available_size = size; + status = WebPIUpdate(idec, data, available_size); + if (status != VP8_STATUS_SUSPENDED || available_size == size) break; + available_size *= 2; + } + } else { + // WebPIAppend expects new data and its size with each call. + // Implemented here by simply advancing the pointer into data. + const uint8_t* new_data = data; + size_t new_size = value + 1; + while (1) { + if (new_data + new_size > data + size) { + new_size = data + size - new_data; + } + status = WebPIAppend(idec, new_data, new_size); + if (status != VP8_STATUS_SUSPENDED || new_size == 0) break; + new_data += new_size; + new_size *= 2; + } + } + WebPIDelete(idec); + } else { + WebPDecode(data, size, &config); + } + + WebPFreeDecBuffer(&config.output); + return 0; +} |