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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 "./fuzz_utils.h"
#include "src/webp/decode.h"
int LLVMFuzzerTestOneInput(const uint8_t* const data, size_t size) {
int w, h;
if (!WebPGetInfo(data, size, &w, &h)) return 0;
if ((size_t)w * h > kFuzzPxLimit) return 0;
const uint8_t value = FuzzHash(data, size);
uint8_t* buf = NULL;
// For *Into functions, which decode into an external buffer, an
// intentionally too small buffer can be given with low probability.
if (value < 0x16) {
buf = WebPDecodeRGBA(data, size, &w, &h);
} else if (value < 0x2b) {
buf = WebPDecodeBGRA(data, size, &w, &h);
#if !defined(WEBP_REDUCE_CSP)
} else if (value < 0x40) {
buf = WebPDecodeARGB(data, size, &w, &h);
} else if (value < 0x55) {
buf = WebPDecodeRGB(data, size, &w, &h);
} else if (value < 0x6a) {
buf = WebPDecodeBGR(data, size, &w, &h);
#endif // !defined(WEBP_REDUCE_CSP)
} else if (value < 0x7f) {
uint8_t *u, *v;
int stride, uv_stride;
buf = WebPDecodeYUV(data, size, &w, &h, &u, &v, &stride, &uv_stride);
} else if (value < 0xe8) {
const int stride = (value < 0xbe ? 4 : 3) * w;
size_t buf_size = stride * h;
if (value % 0x10 == 0) buf_size--;
uint8_t* const ext_buf = (uint8_t*)malloc(buf_size);
if (value < 0x94) {
WebPDecodeRGBAInto(data, size, ext_buf, buf_size, stride);
#if !defined(WEBP_REDUCE_CSP)
} else if (value < 0xa9) {
WebPDecodeARGBInto(data, size, ext_buf, buf_size, stride);
} else if (value < 0xbe) {
WebPDecodeBGRInto(data, size, ext_buf, buf_size, stride);
} else if (value < 0xd3) {
WebPDecodeRGBInto(data, size, ext_buf, buf_size, stride);
#endif // !defined(WEBP_REDUCE_CSP)
} else {
WebPDecodeBGRAInto(data, size, ext_buf, buf_size, stride);
}
free(ext_buf);
} else {
size_t luma_size = w * h;
const int uv_stride = (w + 1) / 2;
size_t u_size = uv_stride * (h + 1) / 2;
size_t v_size = uv_stride * (h + 1) / 2;
if (value % 0x10 == 0) {
if (size & 1) luma_size--;
if (size & 2) u_size--;
if (size & 4) v_size--;
}
uint8_t* const luma_buf = (uint8_t*)malloc(luma_size);
uint8_t* const u_buf = (uint8_t*)malloc(u_size);
uint8_t* const v_buf = (uint8_t*)malloc(v_size);
WebPDecodeYUVInto(data, size, luma_buf, luma_size, w /* luma_stride */,
u_buf, u_size, uv_stride, v_buf, v_size, uv_stride);
free(luma_buf);
free(u_buf);
free(v_buf);
}
if (buf) WebPFree(buf);
return 0;
}
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