Initial version of astc-codec for open source release

Contains an implementation of an ASTC decoder that is able to pass the
dEQP ASTC LDR tests.

astc-codec has no external dependencies for the main library, only for
test code, and is licensed under the Apache license.

Components:

include/ - Public API that can decode ASTC LDR data into a RGBA UNORM8
buffer.

src/base/ - Base library with common functionality not directly related
to ASTC decoding.  Contains a uint128 implementation, BitStream for
reading/writing bits with a primitive (or uint128 type), Optional
implementation (to not take a dependency on C++17), and more.

src/decoder/ - Internal implementation of the ASTC decoder.

src/base/test/, src/decoder/test/ - Unit tests (and a fuzzing test) for
the astc decoder.

src/decoder/testdata/ - Sample ASTC images and golden image results for
testing.

src/decoder/tools/ - A tool to inspect contents of an ASTC file.

third_party/ - Third party libraries, only used for tests.

Change-Id: Ia98e5a7dc847daa3d3a48c5e62d94b8fb1cb98bd

1 files changed, 36 insertions, 0 deletions

diff --git a/src/decoder/test/astc_fuzzer.cc b/src/decoder/test/astc_fuzzer.cc
new file mode 100644
index 0000000..f152675
--- /dev/null
+++ b/src/decoder/test/astc_fuzzer.cc
@@ -0,0 +1,36 @@
+// Copyright 2018 Google LLC
+//
+// 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
+//
+//     https://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.
+
+// ASTC fuzzing wrapper to help with fuzz testing.
+
+#include "src/decoder/codec.h"
+
+#include <benchmark/benchmark.h>
+
+#include <vector>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  std::string error;
+  std::unique_ptr<astc_codec::ASTCFile> file =
+      astc_codec::ASTCFile::LoadFromMemory(reinterpret_cast<const char*>(data),
+                                           size, &error);
+  if (file) {
+    std::vector<uint8_t> out_buffer(file->GetWidth() * file->GetHeight() * 4);
+    bool result = astc_codec::DecompressToImage(
+        *file, out_buffer.data(), out_buffer.size(), file->GetWidth() * 4);
+    benchmark::DoNotOptimize(result);
+  }
+
+  return 0;
+}