1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef PDF_CHUNK_STREAM_H_
6 #define PDF_CHUNK_STREAM_H_
13 namespace chrome_pdf
{
15 // This class collects a chunks of data into one data stream. Client can check
16 // if data in certain range is available, and get missing chunks of data.
24 void Preallocate(size_t stream_size
);
27 bool WriteData(size_t offset
, void* buffer
, size_t size
);
28 bool ReadData(size_t offset
, size_t size
, void* buffer
) const;
30 // Returns vector of pairs where first is an offset, second is a size.
31 bool GetMissedRanges(size_t offset
, size_t size
,
32 std::vector
<std::pair
<size_t, size_t> >* ranges
) const;
33 bool IsRangeAvailable(size_t offset
, size_t size
) const;
34 size_t GetFirstMissingByte() const;
36 size_t GetLastByteBefore(size_t offset
) const;
37 size_t GetFirstByteAfter(size_t offset
) const;
40 std::vector
<unsigned char> data_
;
42 // Pair, first - begining of the chunk, second - size of the chunk.
43 std::map
<size_t, size_t> chunks_
;
46 }; // namespace chrome_pdf