From f7e108b2d0c2f67a143e99693df084bfff7037ec Mon Sep 17 00:00:00 2001
From: dsinclair <dsinclair@chromium.org>
Date: Mon, 6 Jun 2016 08:48:50 -0700
Subject: XFA PNG Fuzzer

This CL creates a fuzzer for the CCodec_PngModule code.

BUG=chromium:616838

Review-Url: https://codereview.chromium.org/2047453002
---
 testing/libfuzzer/BUILD.gn                | 14 ++++++++
 testing/libfuzzer/fuzzers.gyp             | 11 ++++++
 testing/libfuzzer/pdf_codec_png_fuzzer.cc | 60 +++++++++++++++++++++++++++++++
 3 files changed, 85 insertions(+)
 create mode 100644 testing/libfuzzer/pdf_codec_png_fuzzer.cc

diff --git a/testing/libfuzzer/BUILD.gn b/testing/libfuzzer/BUILD.gn
index 0ee8b29e38..e1152f9b69 100644
--- a/testing/libfuzzer/BUILD.gn
+++ b/testing/libfuzzer/BUILD.gn
@@ -47,6 +47,20 @@ if (pdf_enable_xfa) {
       ":libfuzzer_config",
     ]
   }
+  source_set("pdf_codec_png_fuzzer") {
+    testonly = true
+    sources = [
+      "pdf_codec_png_fuzzer.cc",
+    ]
+    deps = [
+      "//third_party/pdfium:pdfium",
+    ]
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [
+      "//build/config/compiler:no_chromium_code",
+      ":libfuzzer_config",
+    ]
+  }
 }
 
 source_set("pdf_jpx_fuzzer") {
diff --git a/testing/libfuzzer/fuzzers.gyp b/testing/libfuzzer/fuzzers.gyp
index 1f04baa77f..2339b5812e 100644
--- a/testing/libfuzzer/fuzzers.gyp
+++ b/testing/libfuzzer/fuzzers.gyp
@@ -59,6 +59,17 @@
             'unittest_main.cc',
           ],
         },
+        {
+          'target_name': 'pdf_codec_png_fuzzer',
+          'type': 'executable',
+          'dependencies': [
+            '../../pdfium.gyp:pdfium',
+          ],
+          'sources': [
+            'pdf_codec_png_fuzzer.cc',
+            'unittest_main.cc',
+          ],
+        },
       ],
     }],
     ['OS=="linux"', {
diff --git a/testing/libfuzzer/pdf_codec_png_fuzzer.cc b/testing/libfuzzer/pdf_codec_png_fuzzer.cc
new file mode 100644
index 0000000000..5422a2f758
--- /dev/null
+++ b/testing/libfuzzer/pdf_codec_png_fuzzer.cc
@@ -0,0 +1,60 @@
+// 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 <memory>
+
+#include "core/fxcodec/codec/include/ccodec_progressivedecoder.h"
+#include "core/fxcodec/include/fx_codec.h"
+#include "core/fxcrt/include/fx_stream.h"
+
+namespace {
+
+class Reader : public IFX_FileRead {
+ public:
+  Reader(const uint8_t* data, size_t size) : m_data(data), m_size(size) {}
+  ~Reader() {}
+
+  void Release() override {}
+
+  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
+    if (offset + size > m_size)
+      size = m_size - offset;
+    memcpy(buffer, m_data + offset, size);
+    return TRUE;
+  }
+
+  FX_FILESIZE GetSize() override { return static_cast<FX_FILESIZE>(m_size); }
+
+ private:
+  const uint8_t* const m_data;
+  size_t m_size;
+};
+
+}  // namespace
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  std::unique_ptr<CCodec_ModuleMgr> mgr(new CCodec_ModuleMgr());
+  std::unique_ptr<CCodec_ProgressiveDecoder> decoder(
+      mgr->CreateProgressiveDecoder());
+  Reader source(data, size);
+
+  FXCODEC_STATUS status =
+      decoder->LoadImageInfo(&source, FXCODEC_IMAGE_PNG, nullptr);
+  if (status != FXCODEC_STATUS_FRAME_READY)
+    return 0;
+
+  std::unique_ptr<CFX_DIBitmap> bitmap(new CFX_DIBitmap);
+  bitmap->Create(decoder->GetWidth(), decoder->GetHeight(), FXDIB_Argb);
+
+  int32_t frames;
+  if (decoder->GetFrames(frames) != FXCODEC_STATUS_DECODE_READY || frames == 0)
+    return 0;
+
+  status = decoder->StartDecode(bitmap.get(), 0, 0, bitmap->GetWidth(),
+                                bitmap->GetHeight());
+  while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE)
+    status = decoder->ContinueDecode();
+
+  return 0;
+}
-- 
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