Add the pdf plugin's source in src\pdf.

pdf/chunk_stream.h

+// Copyright (c) 2010 The Chromium 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 PDF_CHUNK_STREAM_H_
+#define PDF_CHUNK_STREAM_H_
+
+#include <stddef.h>
+
+#include <map>
+#include <vector>
+
+namespace chrome_pdf {
+
+// This class collects a chunks of data into one data stream. Client can check
+// if data in certain range is available, and get missing chunks of data.
+class ChunkStream {
+ public:
+  ChunkStream();
+  ~ChunkStream();
+
+  void Clear();
+
+  void Preallocate(size_t stream_size);
+  size_t GetSize();
+
+  bool WriteData(size_t offset, void* buffer, size_t size);
+  bool ReadData(size_t offset, size_t size, void* buffer) const;
+
+  // Returns vector of pairs where first is an offset, second is a size.
+  bool GetMissedRanges(size_t offset, size_t size,
+      std::vector<std::pair<size_t, size_t> >* ranges) const;
+  bool IsRangeAvailable(size_t offset, size_t size) const;
+  size_t GetFirstMissingByte() const;
+
+  size_t GetLastByteBefore(size_t offset) const;
+  size_t GetFirstByteAfter(size_t offset) const;
+
+ private:
+  std::vector<unsigned char> data_;
+
+  // Pair, first - begining of the chunk, second - size of the chunk.
+  std::map<size_t, size_t> chunks_;
+};
+
+};  // namespace chrome_pdf
+
+#endif