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, 59 insertions, 0 deletions

diff --git a/testing/fuzzers/pdf_codec_jbig2_fuzzer.cc b/testing/fuzzers/pdf_codec_jbig2_fuzzer.cc
new file mode 100644
index 0000000000..7b8e2aac33
--- /dev/null
+++ b/testing/fuzzers/pdf_codec_jbig2_fuzzer.cc
@@ -0,0 +1,59 @@
+// 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 "core/fpdfapi/parser/cpdf_stream.h"
+#include "core/fpdfapi/parser/cpdf_stream_acc.h"
+#include "core/fxcodec/JBig2_DocumentContext.h"
+#include "core/fxcodec/codec/ccodec_jbig2module.h"
+#include "core/fxcodec/jbig2/JBig2_Context.h"
+#include "core/fxcrt/fx_safe_types.h"
+#include "core/fxge/dib/cfx_dibitmap.h"
+#include "core/fxge/fx_dib.h"
+#include "third_party/base/ptr_util.h"
+
+static uint32_t GetInteger(const uint8_t* data) {
+  return data[0] | data[1] << 8 | data[2] << 16 | data[3] << 24;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  const size_t kParameterSize = 8;
+  if (size < kParameterSize)
+    return 0;
+
+  uint32_t width = GetInteger(data);
+  uint32_t height = GetInteger(data + 4);
+  size -= kParameterSize;
+  data += kParameterSize;
+
+  static constexpr uint32_t kMemLimit = 512000000;   // 512 MB
+  static constexpr uint32_t k1bppRgbComponents = 4;  // From CFX_DIBitmap impl.
+  FX_SAFE_UINT32 mem = width;
+  mem *= height;
+  mem *= k1bppRgbComponents;
+  if (!mem.IsValid() || mem.ValueOrDie() > kMemLimit)
+    return 0;
+
+  auto bitmap = pdfium::MakeRetain<CFX_DIBitmap>();
+  if (!bitmap->Create(width, height, FXDIB_1bppRgb))
+    return 0;
+
+  auto stream = pdfium::MakeUnique<CPDF_Stream>();
+  stream->AsStream()->SetData(data, size);
+
+  auto src_stream = pdfium::MakeRetain<CPDF_StreamAcc>(stream->AsStream());
+  src_stream->LoadAllDataRaw();
+
+  CCodec_Jbig2Module module;
+  CCodec_Jbig2Context jbig2_context;
+  std::unique_ptr<JBig2_DocumentContext> document_context;
+  FXCODEC_STATUS status = module.StartDecode(
+      &jbig2_context, &document_context, width, height, src_stream, nullptr,
+      bitmap->GetBuffer(), bitmap->GetPitch(), nullptr);
+
+  while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE)
+    status = module.ContinueDecode(&jbig2_context, nullptr);
+  return 0;
+}