69 lines
2.1 KiB
C++
69 lines
2.1 KiB
C++
// Copyright (c) 2013 Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// A simple write buffer implementation, which appends various data types to
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// buffer.
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#ifndef MEDIA_BASE_BUFFER_WRITER_H_
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#define MEDIA_BASE_BUFFER_WRITER_H_
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#include <vector>
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#include "media/base/status.h"
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namespace media {
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class File;
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class BufferWriter {
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public:
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BufferWriter();
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// Construct the object with a reserved capacity of |reserved_size_in_bytes|.
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// The value is intended for optimization and is not a hard limit. It does
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// not affect the actual size of the buffer, which is still starting from 0.
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explicit BufferWriter(size_t reserved_size_in_bytes);
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~BufferWriter();
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// These convenient functions append the integers (in network byte order,
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// i.e. big endian) of various size and signedness to the end of the buffer.
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void AppendInt(uint8 v);
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void AppendInt(uint16 v);
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void AppendInt(uint32 v);
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void AppendInt(uint64 v);
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void AppendInt(int16 v);
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void AppendInt(int32 v);
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void AppendInt(int64 v);
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// Append the least significant |num_bytes| of |v| to buffer. |num_bytes|
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// should not be larger than sizeof(v), i.e. 8.
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void AppendNBytes(uint64 v, size_t num_bytes);
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void AppendVector(const std::vector<uint8>& v);
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void AppendArray(const uint8* buf, size_t size);
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void AppendBuffer(const BufferWriter& buffer);
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void Swap(BufferWriter* buffer) { buf_.swap(buffer->buf_); }
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void Clear() { buf_.clear(); }
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size_t Size() const { return buf_.size(); }
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// Return underlying buffer. Behavior is undefined if the buffer size is 0.
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const uint8* Buffer() const { return &buf_[0]; }
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// Write the buffer to file. |file| should not be NULL.
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// Returns OK on success. The internal buffer will be cleared after writing.
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Status WriteToFile(File* file);
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private:
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// Internal implementation of multi-byte write.
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template <typename T>
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void AppendInternal(T v);
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std::vector<uint8> buf_;
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DISALLOW_COPY_AND_ASSIGN(BufferWriter);
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};
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} // namespace media
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#endif // MEDIA_BASE_BUFFER_WRITER_H_
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