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