113 lines
1.9 KiB
C++
113 lines
1.9 KiB
C++
|
// Copyright (C) 2002-2007 Nikolaus Gebhardt
|
||
|
|
// This file is part of the "Irrlicht Engine".
|
||
|
|
// For conditions of distribution and use, see copyright notice in irrlicht.h
|
||
|
|
|
||
|
|
#include "CMemoryReadFile.h"
|
||
|
|
#include "irrString.h"
|
||
|
|
|
||
|
|
namespace irr
|
||
|
|
{
|
||
|
|
namespace io
|
||
|
|
{
|
||
|
|
|
||
|
|
|
||
|
|
CMemoryReadFile::CMemoryReadFile(void* memory, s32 len, const c8* fileName, bool d)
|
||
|
|
: Buffer(memory), Len(len), Pos(0), deleteMemoryWhenDropped(d)
|
||
|
|
{
|
||
|
|
#ifdef _DEBUG
|
||
|
|
setDebugName("CReadFile");
|
||
|
|
#endif
|
||
|
|
|
||
|
|
Filename = fileName;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
CMemoryReadFile::~CMemoryReadFile()
|
||
|
|
{
|
||
|
|
if (deleteMemoryWhenDropped)
|
||
|
|
delete [] (c8*)Buffer;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//! returns how much was read
|
||
|
|
s32 CMemoryReadFile::read(void* buffer, u32 sizeToRead)
|
||
|
|
{
|
||
|
|
s32 amount = sizeToRead;
|
||
|
|
if (Pos + amount > Len)
|
||
|
|
amount -= Pos + amount - Len;
|
||
|
|
|
||
|
|
if (amount < 0)
|
||
|
|
amount = 0;
|
||
|
|
|
||
|
|
c8* p = (c8*)Buffer;
|
||
|
|
memcpy(buffer, p + Pos, amount);
|
||
|
|
|
||
|
|
Pos += static_cast<u32> ( amount );
|
||
|
|
|
||
|
|
return 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(s32 finalPos, bool relativeMovement)
|
||
|
|
{
|
||
|
|
if (relativeMovement)
|
||
|
|
{
|
||
|
|
if (Pos + finalPos > Len)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
Pos += finalPos;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if ( (unsigned) finalPos > Len)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
Pos = finalPos;
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//! returns size of file
|
||
|
|
s32 CMemoryReadFile::getSize()
|
||
|
|
{
|
||
|
|
return Len;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//! returns where in the file we are.
|
||
|
|
s32 CMemoryReadFile::getPos()
|
||
|
|
{
|
||
|
|
return Pos;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//! returns name of file
|
||
|
|
const c8* CMemoryReadFile::getFileName()
|
||
|
|
{
|
||
|
|
return Filename.c_str();
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
IReadFile* createMemoryReadFile(void* memory, s32 size, const c8* fileName, bool deleteMemoryWhenDropped)
|
||
|
|
{
|
||
|
|
CMemoryReadFile* file = new CMemoryReadFile(memory, size, fileName, deleteMemoryWhenDropped);
|
||
|
|
return file;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
} // end namespace io
|
||
|
|
} // end namespace irr
|
||
|
|
|