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git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6348 dfc29bdd-3216-0410-991c-e03cc46cb475
189 lines
3.7 KiB
C++
189 lines
3.7 KiB
C++
// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#include "CMemoryFile.h"
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#include "irrString.h"
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namespace irr
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{
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namespace io
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{
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CMemoryReadFile::CMemoryReadFile(const void* memory, long len, const io::path& fileName, bool d)
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: Buffer(memory), Len(len), Pos(0), Filename(fileName), deleteMemoryWhenDropped(d)
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{
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#ifdef _DEBUG
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setDebugName("CMemoryReadFile");
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#endif
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}
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CMemoryReadFile::~CMemoryReadFile()
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{
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if (deleteMemoryWhenDropped)
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delete [] (c8*)Buffer;
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}
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//! returns how much was read
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size_t CMemoryReadFile::read(void* buffer, size_t sizeToRead)
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{
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long amount = static_cast<long>(sizeToRead);
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if (Pos + amount > Len)
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amount -= Pos + amount - Len;
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if (amount <= 0)
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return 0;
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c8* p = (c8*)Buffer;
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memcpy(buffer, p + Pos, amount);
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Pos += amount;
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return static_cast<size_t>(amount);
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}
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//! changes position in file, returns true if successful
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//! if relativeMovement==true, the pos is changed relative to current pos,
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//! otherwise from begin of file
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bool CMemoryReadFile::seek(long finalPos, bool relativeMovement)
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{
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if (relativeMovement)
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{
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const long newPos = Pos + finalPos;
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if (newPos > Len || newPos < 0)
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return false;
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Pos += finalPos;
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}
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else
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{
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if (finalPos > Len || finalPos < 0)
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return false;
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Pos = finalPos;
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}
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return true;
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}
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//! returns size of file
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long CMemoryReadFile::getSize() const
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{
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return Len;
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}
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//! returns where in the file we are.
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long CMemoryReadFile::getPos() const
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{
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return Pos;
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}
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//! returns name of file
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const io::path& CMemoryReadFile::getFileName() const
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{
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return Filename;
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}
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CMemoryWriteFile::CMemoryWriteFile(void* memory, long len, const io::path& fileName, bool d)
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: Buffer(memory), Len(len), Pos(0), Filename(fileName), deleteMemoryWhenDropped(d)
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{
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#ifdef _DEBUG
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setDebugName("CMemoryWriteFile");
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#endif
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}
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CMemoryWriteFile::~CMemoryWriteFile()
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{
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if (deleteMemoryWhenDropped)
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delete [] (c8*)Buffer;
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}
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//! returns how much was written
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size_t CMemoryWriteFile::write(const void* buffer, size_t sizeToWrite)
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{
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long amount = (long)sizeToWrite;
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if (Pos + amount > Len)
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amount -= Pos + amount - Len;
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if (amount <= 0)
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return 0;
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c8* p = (c8*)Buffer;
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memcpy(p + Pos, buffer, amount);
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Pos += amount;
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return (size_t)amount;
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}
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//! changes position in file, returns true if successful
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//! if relativeMovement==true, the pos is changed relative to current pos,
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//! otherwise from begin of file
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bool CMemoryWriteFile::seek(long finalPos, bool relativeMovement)
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{
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if (relativeMovement)
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{
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if (Pos + finalPos > Len)
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return false;
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Pos += finalPos;
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}
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else
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{
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if (finalPos > Len)
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return false;
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Pos = finalPos;
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}
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return true;
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}
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//! returns where in the file we are.
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long CMemoryWriteFile::getPos() const
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{
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return Pos;
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}
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//! returns name of file
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const io::path& CMemoryWriteFile::getFileName() const
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{
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return Filename;
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}
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bool CMemoryWriteFile::flush()
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{
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return true; // no buffering, so nothing to do
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}
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IReadFile* createMemoryReadFile(const void* memory, long size, const io::path& fileName, bool deleteMemoryWhenDropped)
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{
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CMemoryReadFile* file = new CMemoryReadFile(memory, size, fileName, deleteMemoryWhenDropped);
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return file;
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}
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IWriteFile* createMemoryWriteFile(void* memory, long size, const io::path& fileName, bool deleteMemoryWhenDropped)
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{
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CMemoryWriteFile* file = new CMemoryWriteFile(memory, size, fileName, deleteMemoryWhenDropped);
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return file;
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}
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} // end namespace io
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} // end namespace irr
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