123 lines
2.2 KiB
C++
123 lines
2.2 KiB
C++
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// 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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CMemoryFile::CMemoryFile(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("CMemoryFile");
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#endif
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}
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CMemoryFile::~CMemoryFile()
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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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s32 CMemoryFile::read(void* buffer, u32 sizeToRead)
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{
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s32 amount = static_cast<s32>(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 amount;
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}
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//! returns how much was written
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s32 CMemoryFile::write(const void* buffer, u32 sizeToWrite)
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{
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s32 amount = static_cast<s32>(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 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 CMemoryFile::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 size of file
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long CMemoryFile::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 CMemoryFile::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& CMemoryFile::getFileName() const
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{
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return Filename;
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}
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IReadFile* createMemoryReadFile(void* memory, long size, const io::path& fileName, bool deleteMemoryWhenDropped)
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{
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CMemoryFile* file = new CMemoryFile(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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