88 lines
1.8 KiB
C++
88 lines
1.8 KiB
C++
/* -----------------------------------------------------------------------------
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GSFramework
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Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
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----------------------------------------------------------------------------- */
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#ifndef __NIOBUFFER__
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#define __NIOBUFFER__
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#include "filesystem/io_handle.h"
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#include "nstring/nstring.h"
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#include "memory/nauto_ptr.h"
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#include "container/narray.h"
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#include "unit/nunit.h"
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namespace GS {
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namespace IO {
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//
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struct IOBuffer
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{
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Array <char> buffer;
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size_t start_pos;
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size_t usage;
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IOBuffer() : start_pos(0), usage(0) {}
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};
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//
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class BufferHandle : public Handle
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{
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friend class Buffer;
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AutoPtr <Handle> handle;
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size_t size; // file size on wrapped fs
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size_t pos; // position in source handle
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IOBuffer read_buffer;
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public:
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virtual size_t GetSize() { return size; }
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BufferHandle(Base *io, Handle *h) : Handle(io), handle(h), size(0), pos(0) {}
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};
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/*!
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@short Buffered I/O filesystem wrapper.
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Implements a transparent read/write buffer on top of another filesystem.
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@author Emmanuel Julien (ejulien@nworks.fr)
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*/
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class Buffer : public Base
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{
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SharedPtr <Base> io;
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size_t read_buffer_size,
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write_buffer_size;
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public:
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virtual uint GetCaps() const;
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virtual Handle *Open(const char *, Mode = ModeRead);
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virtual void Close(Handle *);
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virtual String Hash(const char *);
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virtual bool Delete(const char *);
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virtual size_t Tell(Handle *);
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virtual size_t Seek(Handle *, ptrdiff_t offset, SeekRef = SeekCurrent);
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virtual size_t Read(Handle *, void *, size_t);
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virtual size_t Write(Handle *, const void *, size_t);
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virtual bool MkDir(const char *);
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Buffer(Base *base, size_t read_buffer_size = Units::KB(4), size_t write_buffer_size = Units::KB(4));
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};
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} // IO
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} // GS
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#endif // __NIOBUFFER__
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