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

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

tests/fuzzer/mux_demux_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/demux.h"
+#include "src/webp/mux.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;
+
+  // Extracted chunks and frames are not processed or decoded,
+  // which is already covered extensively by the other fuzz targets.
+
+  if (size & 1) {
+    // Mux API
+    WebPMux* mux = WebPMuxCreate(&webp_data, size & 2);
+    if (!mux) return 0;
+
+    WebPData chunk;
+    WebPMuxGetChunk(mux, "EXIF", &chunk);
+    WebPMuxGetChunk(mux, "ICCP", &chunk);
+    WebPMuxGetChunk(mux, "FUZZ", &chunk);  // unknown
+
+    uint32_t flags;
+    WebPMuxGetFeatures(mux, &flags);
+
+    WebPMuxAnimParams params;
+    WebPMuxGetAnimationParams(mux, &params);
+
+    WebPMuxError status;
+    WebPMuxFrameInfo info;
+    for (int i = 0; i < kFuzzFrameLimit; i++) {
+      status = WebPMuxGetFrame(mux, i + 1, &info);
+      if (status == WEBP_MUX_NOT_FOUND) {
+        break;
+      } else if (status == WEBP_MUX_OK) {
+        WebPDataClear(&info.bitstream);
+      }
+    }
+
+    WebPMuxDelete(mux);
+  } else {
+    // Demux API
+    WebPDemuxer* demux;
+    if (size & 2) {
+      WebPDemuxState state;
+      demux = WebPDemuxPartial(&webp_data, &state);
+      if (state < WEBP_DEMUX_PARSED_HEADER) {
+        WebPDemuxDelete(demux);
+        return 0;
+      }
+    } else {
+      demux = WebPDemux(&webp_data);
+      if (!demux) return 0;
+    }
+
+    WebPChunkIterator chunk_iter;
+    if (WebPDemuxGetChunk(demux, "EXIF", 1, &chunk_iter)) {
+      WebPDemuxNextChunk(&chunk_iter);
+    }
+    WebPDemuxReleaseChunkIterator(&chunk_iter);
+    if (WebPDemuxGetChunk(demux, "ICCP", 0, &chunk_iter)) {  // 0 == last
+      WebPDemuxPrevChunk(&chunk_iter);
+    }
+    WebPDemuxReleaseChunkIterator(&chunk_iter);
+    // Skips FUZZ because the Demux API has no concept of (un)known chunks.
+
+    WebPIterator iter;
+    if (WebPDemuxGetFrame(demux, 1, &iter)) {
+      for (int i = 1; i < kFuzzFrameLimit; i++) {
+        if (!WebPDemuxNextFrame(&iter)) break;
+      }
+    }
+
+    WebPDemuxReleaseIterator(&iter);
+    WebPDemuxDelete(demux);
+  }
+
+  return 0;
+}