Squashed 'external/libwebp/libwebp/' content from commit dd7364c3c

git-subtree-dir: external/libwebp/libwebp
git-subtree-split: dd7364c3cefe0f5c0b3c18c3b1887d353f90fc1f

tests/fuzzer/animation_api_fuzzer.c

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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"
+#include "src/webp/demux.h"
+#include "src/webp/mux_types.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t* const data, size_t size) {
+  WebPData webp_data;
+  WebPDataInit(&webp_data);
+  webp_data.size = size;
+  webp_data.bytes = data;
+
+  // WebPAnimDecoderNew uses WebPDemux internally to calloc canvas size.
+  WebPDemuxer* const demux = WebPDemux(&webp_data);
+  if (!demux) return 0;
+  const uint32_t cw = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
+  const uint32_t ch = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
+  if ((size_t)cw * ch > kFuzzPxLimit) {
+    WebPDemuxDelete(demux);
+    return 0;
+  }
+
+  // In addition to canvas size, check each frame separately.
+  WebPIterator iter;
+  for (int i = 0; i < kFuzzFrameLimit; i++) {
+    if (!WebPDemuxGetFrame(demux, i + 1, &iter)) break;
+    int w, h;
+    if (WebPGetInfo(iter.fragment.bytes, iter.fragment.size, &w, &h)) {
+      if ((size_t)w * h > kFuzzPxLimit) {  // image size of the frame payload
+        WebPDemuxReleaseIterator(&iter);
+        WebPDemuxDelete(demux);
+        return 0;
+      }
+    }
+  }
+
+  WebPDemuxReleaseIterator(&iter);
+  WebPDemuxDelete(demux);
+
+  WebPAnimDecoderOptions dec_options;
+  if (!WebPAnimDecoderOptionsInit(&dec_options)) return 0;
+
+  dec_options.use_threads = size & 1;
+  // Animations only support 4 (of 12) modes.
+  dec_options.color_mode = (WEBP_CSP_MODE)(size % MODE_LAST);
+  if (dec_options.color_mode != MODE_BGRA &&
+      dec_options.color_mode != MODE_rgbA &&
+      dec_options.color_mode != MODE_bgrA) {
+    dec_options.color_mode = MODE_RGBA;
+  }
+
+  WebPAnimDecoder* dec = WebPAnimDecoderNew(&webp_data, &dec_options);
+  if (!dec) return 0;
+
+  for (int i = 0; i < kFuzzFrameLimit; i++) {
+    uint8_t* buf;
+    int timestamp;
+    if (!WebPAnimDecoderGetNext(dec, &buf, &timestamp)) break;
+  }
+
+  WebPAnimDecoderDelete(dec);
+  return 0;
+}