84 lines
2.2 KiB
C++
84 lines
2.2 KiB
C++
/* Copyright (c) 2010 Wildfire Games
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef INCLUDED_WRITE_BUFFER
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#define INCLUDED_WRITE_BUFFER
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#include "lib/file/file.h"
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class WriteBuffer
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{
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public:
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WriteBuffer();
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void Append(const void* data, size_t size);
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void Overwrite(const void* data, size_t size, size_t offset);
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shared_ptr<u8> Data() const
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{
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return m_data;
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}
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size_t Size() const
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{
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return m_size;
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}
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private:
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size_t m_capacity; // must come first (init order)
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shared_ptr<u8> m_data;
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size_t m_size;
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};
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class UnalignedWriter
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{
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NONCOPYABLE(UnalignedWriter);
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public:
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UnalignedWriter(const PFile& file, off_t ofs);
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~UnalignedWriter();
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/**
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* add data to the align buffer, writing it out to disk if full.
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**/
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LibError Append(const u8* data, size_t size) const;
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/**
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* zero-initialize any remaining space in the align buffer and write
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* it to the file. this is called by the destructor.
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**/
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void Flush() const;
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private:
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LibError WriteBlock() const;
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PFile m_file;
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shared_ptr<u8> m_alignedBuf;
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mutable off_t m_alignedOfs;
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mutable size_t m_bytesUsed;
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};
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typedef shared_ptr<UnalignedWriter> PUnalignedWriter;
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#endif // #ifndef INCLUDED_WRITE_BUFFER
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