Move fuzzers to testing/fuzzers.

Move them out of testing/libfuzzer, to make it possible to pull
libfuzzer into that directory. Leave testing/libfuzzer/BUILD.gn there
for now as a transitional build file.

BUG=pdfium:1088

Change-Id: I4126d89dd3e075ac63477a4860e029c135866dbe
Reviewed-on: https://pdfium-review.googlesource.com/32896
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

1 files changed, 57 insertions, 0 deletions

diff --git a/testing/fuzzers/pdf_jpx_fuzzer.cc b/testing/fuzzers/pdf_jpx_fuzzer.cc
new file mode 100644
index 0000000000..da65bc2d9a
--- /dev/null
+++ b/testing/fuzzers/pdf_jpx_fuzzer.cc
@@ -0,0 +1,57 @@
+// Copyright 2016 The PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+#include "core/fxcodec/codec/ccodec_jpxmodule.h"
+#include "core/fxcodec/codec/cjpx_decoder.h"
+#include "core/fxcrt/fx_safe_types.h"
+#include "core/fxge/dib/cfx_dibitmap.h"
+#include "core/fxge/fx_dib.h"
+
+CCodec_JpxModule g_module;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  std::unique_ptr<CJPX_Decoder> decoder =
+      g_module.CreateDecoder(data, size, nullptr);
+  if (!decoder)
+    return 0;
+
+  uint32_t width;
+  uint32_t height;
+  uint32_t components;
+  g_module.GetImageInfo(decoder.get(), &width, &height, &components);
+
+  static constexpr uint32_t kMemLimit = 1024 * 1024 * 1024;  // 1 GB.
+  FX_SAFE_UINT32 mem = width;
+  mem *= height;
+  mem *= components;
+  if (!mem.IsValid() || mem.ValueOrDie() > kMemLimit)
+    return 0;
+
+  FXDIB_Format format;
+  if (components == 1) {
+    format = FXDIB_8bppRgb;
+  } else if (components <= 3) {
+    format = FXDIB_Rgb;
+  } else if (components == 4) {
+    format = FXDIB_Rgb32;
+  } else {
+    width = (width * components + 2) / 3;
+    format = FXDIB_Rgb;
+  }
+  auto bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
+  if (!bitmap->Create(width, height, format))
+    return 0;
+
+  std::vector<uint8_t> output_offsets(components);
+  for (uint32_t i = 0; i < components; ++i)
+    output_offsets[i] = i;
+
+  g_module.Decode(decoder.get(), bitmap->GetBuffer(), bitmap->GetPitch(),
+                  output_offsets);
+  return 0;
+}