Space-Project/dependencies/physx-4.1/source/filebuf/include/PsFileBuffer.h
2021-01-16 17:11:39 +01:00

251 lines
5.4 KiB
C++

//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of NVIDIA CORPORATION nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2008-2019 NVIDIA Corporation. All rights reserved.
#ifndef PSFILEBUFFER_PSFILEBUFFER_H
#define PSFILEBUFFER_PSFILEBUFFER_H
#include "filebuf/PxFileBuf.h"
#include "Ps.h"
#include "PsUserAllocated.h"
#include <stdio.h>
namespace physx
{
namespace general_PxIOStream2
{
using namespace shdfnd;
//Use this class if you want to use your own allocator
class PxFileBufferBase : public PxFileBuf
{
public:
PxFileBufferBase(const char *fileName,OpenMode mode)
{
mOpenMode = mode;
mFph = NULL;
mFileLength = 0;
mSeekRead = 0;
mSeekWrite = 0;
mSeekCurrent = 0;
switch ( mode )
{
case OPEN_READ_ONLY:
mFph = fopen(fileName,"rb");
break;
case OPEN_WRITE_ONLY:
mFph = fopen(fileName,"wb");
break;
case OPEN_READ_WRITE_NEW:
mFph = fopen(fileName,"wb+");
break;
case OPEN_READ_WRITE_EXISTING:
mFph = fopen(fileName,"rb+");
break;
case OPEN_FILE_NOT_FOUND:
break;
}
if ( mFph )
{
fseek(mFph,0L,SEEK_END);
mFileLength = static_cast<uint32_t>(ftell(mFph));
fseek(mFph,0L,SEEK_SET);
}
else
{
mOpenMode = OPEN_FILE_NOT_FOUND;
}
}
virtual ~PxFileBufferBase()
{
close();
}
virtual void close()
{
if( mFph )
{
fclose(mFph);
mFph = 0;
}
}
virtual SeekType isSeekable(void) const
{
return mSeekType;
}
virtual uint32_t read(void* buffer, uint32_t size)
{
uint32_t ret = 0;
if ( mFph )
{
setSeekRead();
ret = static_cast<uint32_t>(::fread(buffer,1,size,mFph));
mSeekRead+=ret;
mSeekCurrent+=ret;
}
return ret;
}
virtual uint32_t peek(void* buffer, uint32_t size)
{
uint32_t ret = 0;
if ( mFph )
{
uint32_t loc = tellRead();
setSeekRead();
ret = static_cast<uint32_t>(::fread(buffer,1,size,mFph));
mSeekCurrent+=ret;
seekRead(loc);
}
return ret;
}
virtual uint32_t write(const void* buffer, uint32_t size)
{
uint32_t ret = 0;
if ( mFph )
{
setSeekWrite();
ret = static_cast<uint32_t>(::fwrite(buffer,1,size,mFph));
mSeekWrite+=ret;
mSeekCurrent+=ret;
if ( mSeekWrite > mFileLength )
{
mFileLength = mSeekWrite;
}
}
return ret;
}
virtual uint32_t tellRead(void) const
{
return mSeekRead;
}
virtual uint32_t tellWrite(void) const
{
return mSeekWrite;
}
virtual uint32_t seekRead(uint32_t loc)
{
mSeekRead = loc;
if ( mSeekRead > mFileLength )
{
mSeekRead = mFileLength;
}
return mSeekRead;
}
virtual uint32_t seekWrite(uint32_t loc)
{
mSeekWrite = loc;
if ( mSeekWrite > mFileLength )
{
mSeekWrite = mFileLength;
}
return mSeekWrite;
}
virtual void flush(void)
{
if ( mFph )
{
::fflush(mFph);
}
}
virtual OpenMode getOpenMode(void) const
{
return mOpenMode;
}
virtual uint32_t getFileLength(void) const
{
return mFileLength;
}
private:
// Moves the actual file pointer to the current read location
void setSeekRead(void)
{
if ( mSeekRead != mSeekCurrent && mFph )
{
if ( mSeekRead >= mFileLength )
{
fseek(mFph,0L,SEEK_END);
}
else
{
fseek(mFph,static_cast<long>(mSeekRead),SEEK_SET);
}
mSeekCurrent = mSeekRead = static_cast<uint32_t>(ftell(mFph));
}
}
// Moves the actual file pointer to the current write location
void setSeekWrite(void)
{
if ( mSeekWrite != mSeekCurrent && mFph )
{
if ( mSeekWrite >= mFileLength )
{
fseek(mFph,0L,SEEK_END);
}
else
{
fseek(mFph,static_cast<long>(mSeekWrite),SEEK_SET);
}
mSeekCurrent = mSeekWrite = static_cast<uint32_t>(ftell(mFph));
}
}
FILE *mFph;
uint32_t mSeekRead;
uint32_t mSeekWrite;
uint32_t mSeekCurrent;
uint32_t mFileLength;
SeekType mSeekType;
OpenMode mOpenMode;
};
//Use this class if you want to use PhysX memory allocator
class PsFileBuffer: public PxFileBufferBase, public UserAllocated
{
public:
PsFileBuffer(const char *fileName,OpenMode mode): PxFileBufferBase(fileName, mode) {}
};
}
using namespace general_PxIOStream2;
}
#endif // PSFILEBUFFER_PSFILEBUFFER_H