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// 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 <utility>
#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() const;
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;
// Finds the first byte of the missing byte interval that offset belongs to.
size_t GetFirstMissingByteInInterval(size_t offset) const;
// Returns the last byte of the missing byte interval that offset belongs to.
size_t GetLastMissingByteInInterval(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_;
size_t stream_size_;
};
}; // namespace chrome_pdf
#endif // PDF_CHUNK_STREAM_H_
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