Add GIF, BMP, JPEG and TIFF XFA fuzzers

testing/libfuzzer/xfa_codec_fuzzer.h

+// 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.
+
+#ifndef TESTING_LIBFUZZER_XFA_CODEC_FUZZER_H_
+#define TESTING_LIBFUZZER_XFA_CODEC_FUZZER_H_
+
+#include <memory>
+
+#include "core/fxcodec/codec/include/ccodec_progressivedecoder.h"
+#include "core/fxcodec/include/fx_codec.h"
+#include "core/fxcrt/include/fx_stream.h"
+
+class XFACodecFuzzer {
+ public:
+  static int fuzz(const uint8_t* data, size_t size, FXCODEC_IMAGE_TYPE type) {

[Oliver Chang, 2016/06/06 17:40:52]

nit: capitalise "fuzz"?

[dsinclair, 2016/06/06 18:11:45]

Done.

+    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, type, 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;
+  }
+
+ private:
+  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;
+  };
+};
+
+#endif  // TESTING_LIBFUZZER_XFA_CODEC_FUZZER_H_