text: // 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 "fuzzing/fuzz.h"
  #include "src/webp/decode.h"
  
  extern "C" 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;
  }
  