64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
/*
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* Copyright 2009-2014, Haiku, Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* Bruno Albuquerque, bga@bug-br.org.br
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*/
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#ifndef _DYNAMIC_BUFFER_H
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#define _DYNAMIC_BUFFER_H
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#include <DataIO.h>
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#include <SupportDefs.h>
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class DynamicBuffer : public BDataIO {
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public:
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DynamicBuffer(size_t initialSize = 0);
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~DynamicBuffer();
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DynamicBuffer(const DynamicBuffer& buffer);
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// InitCheck() should be called to guarantee the object initialization
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// didn't fail. If it does not return B_OK, the initialization failed.
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status_t InitCheck() const;
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// Insert data at the end of the buffer. The buffer will be increased to
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// accomodate the data if needed.
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status_t Write(const void* data, size_t size);
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// Remove data from the start of the buffer. Move the buffer start
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// pointer to point to the data following it.
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ssize_t Read(void* data, size_t size);
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// Return a pointer to the underlying buffer. Note this will not
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// necessarily be a pointer to the start of the allocated memory as the
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// initial data may be positioned at an offset inside the buffer. In other
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// words, this returns a pointer to the start of data inside the buffer.
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unsigned char* Data() const;
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// Returns the actual buffer size. This is the amount of memory allocated
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// for the buffer.
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size_t Size() const;
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// Number of bytes of data still present in the buffer that can be
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// extracted through calls to Remove().
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size_t BytesRemaining() const;
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// Dump some buffer statistics to stdout.
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void PrintToStream();
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private:
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status_t _GrowToFit(size_t size, bool exact = false);
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unsigned char* fBuffer;
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size_t fBufferSize;
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size_t fDataStart;
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size_t fDataEnd;
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status_t fInit;
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};
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#endif // _DYNAMIC_BUFFER_H
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