Move more internal fuzzers to public.

Change-Id: Idde75f374264666e4c54a17b1606464ad5d00d9c

tests/fuzzer/enc_fuzzer.cc

@@ -0,0 +1,140 @@
+// Copyright 2024 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 <cstddef>
+#include <cstdint>
+#include <cstdlib>
+#include <iostream>
+#include <string>
+#include <string_view>
+
+#include "imageio/image_dec.h"
+#include "src/dsp/cpu.h"
+#include "src/webp/decode.h"
+#include "src/webp/encode.h"
+#include "src/webp/types.h"
+#include "tests/fuzzer/fuzz_utils.h"
+
+namespace {
+
+const VP8CPUInfo default_VP8GetCPUInfo = fuzz_utils::VP8GetCPUInfo;
+
+void EncTest(std::string_view file, uint32_t optimization_index, bool use_argb,
+             WebPConfig config,
+             const fuzz_utils::CropOrScaleParams& crop_or_scale_params) {
+  fuzz_utils::SetOptimization(default_VP8GetCPUInfo, optimization_index);
+
+  // Init the source picture.
+  WebPPicture pic;
+  if (!WebPPictureInit(&pic)) {
+    std::cerr << "WebPPictureInit failed.\n";
+    abort();
+  }
+  pic.use_argb = use_argb;
+
+  const uint8_t* const file_data =
+      reinterpret_cast<const uint8_t*>(file.data());
+  if (fuzz_utils::IsImageTooBig(file_data, file.size())) return;
+  WebPImageReader reader = WebPGuessImageReader(file_data, file.size());
+  if (!reader(file_data, file.size(), &pic, 1, NULL)) return;
+
+  // Crop and scale.
+  if (!CropOrScale(&pic, crop_or_scale_params)) {
+    const WebPEncodingError error_code = pic.error_code;
+    WebPPictureFree(&pic);
+    if (error_code == VP8_ENC_ERROR_OUT_OF_MEMORY) return;
+    std::cerr << "CropOrScale failed. Error code: " << error_code << "\n";
+    abort();
+  }
+
+  // Skip the cruncher except on small images, it's likely to timeout.
+  if (config.lossless && config.quality == 100. && config.method == 6 &&
+      pic.width * pic.height >= 16384) {
+    config.lossless = 0;
+  }
+
+  // Encode.
+  WebPMemoryWriter memory_writer;
+  WebPMemoryWriterInit(&memory_writer);
+  pic.writer = WebPMemoryWrite;
+  pic.custom_ptr = &memory_writer;
+  if (!WebPEncode(&config, &pic)) {
+    const WebPEncodingError error_code = pic.error_code;
+    WebPMemoryWriterClear(&memory_writer);
+    WebPPictureFree(&pic);
+    if (error_code == VP8_ENC_ERROR_OUT_OF_MEMORY) return;
+    std::cerr << "WebPEncode failed. Error code: " << error_code
+              << " \nFile starts with: " << file.substr(0, 20) << "\n";
+    abort();
+  }
+
+  // Try decoding the result.
+  int w, h;
+  const uint8_t* const out_data = memory_writer.mem;
+  const size_t out_size = memory_writer.size;
+  uint8_t* const rgba = WebPDecodeBGRA(out_data, out_size, &w, &h);
+  if (rgba == nullptr || w != pic.width || h != pic.height) {
+    std::cerr << "WebPDecodeBGRA failed.\nFile starts with: "
+              << file.substr(0, 20) << "\n";
+    WebPFree(rgba);
+    WebPMemoryWriterClear(&memory_writer);
+    WebPPictureFree(&pic);
+    abort();
+  }
+
+  // Compare the results if exact encoding.
+  if (pic.use_argb && config.lossless && config.near_lossless == 100) {
+    const uint32_t* src1 = (const uint32_t*)rgba;
+    const uint32_t* src2 = pic.argb;
+    for (int y = 0; y < h; ++y, src1 += w, src2 += pic.argb_stride) {
+      for (int x = 0; x < w; ++x) {
+        uint32_t v1 = src1[x], v2 = src2[x];
+        if (!config.exact) {
+          if ((v1 & 0xff000000u) == 0 || (v2 & 0xff000000u) == 0) {
+            // Only keep alpha for comparison of fully transparent area.
+            v1 &= 0xff000000u;
+            v2 &= 0xff000000u;
+          }
+        }
+        if (v1 != v2) {
+          std::cerr
+              << "Lossless compression failed pixel-exactness.\nFile starts "
+                 "with: "
+              << file.substr(0, 20) << "\n";
+          WebPFree(rgba);
+          WebPMemoryWriterClear(&memory_writer);
+          WebPPictureFree(&pic);
+          abort();
+        }
+      }
+    }
+  }
+
+  WebPFree(rgba);
+  WebPMemoryWriterClear(&memory_writer);
+  WebPPictureFree(&pic);
+}
+
+}  // namespace
+
+FUZZ_TEST(Enc, EncTest)
+    .WithDomains(
+        fuzztest::Arbitrary<std::string>(),
+        /*optimization_index=*/
+        fuzztest::InRange<uint32_t>(0, fuzz_utils::kMaxOptimizationIndex),
+        /*use_argb=*/fuzztest::Arbitrary<bool>(),
+        fuzz_utils::ArbitraryWebPConfig(),
+        fuzz_utils::ArbitraryCropOrScaleParams());