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/** \file
* \brief System Dependent Binary File Access (UNIX)
*
* See Copyright Notice in im_lib.h
* $Id: im_sysfile_unix.cpp,v 1.1 2008/10/17 06:10:16 scuri Exp $
*/
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include "im_util.h"
#include "im_binfile.h"
class imBinSystemFile: public imBinFileBase
{
protected:
int FileHandle,
Error;
unsigned long ReadBuf(void* pValues, unsigned long pSize);
unsigned long WriteBuf(void* pValues, unsigned long pSize);
public:
virtual void Open(const char* pFileName);
virtual void New(const char* pFileName);
virtual void Close();
unsigned long FileSize();
int HasError() const;
void SeekTo(unsigned long pOffset);
void SeekOffset(long pOffset);
void SeekFrom(long pOffset);
unsigned long Tell() const;
int EndOfFile() const;
};
imBinFileBase* iBinSystemFileNewFunc()
{
return new imBinSystemFile();
}
void imBinSystemFile::Open(const char* pFileName)
{
int mode = O_RDONLY;
#ifdef O_BINARY
mode |= O_BINARY;
#endif
this->FileHandle = open(pFileName, mode, 0);
if (this->FileHandle < 0)
this->Error = errno;
else
this->Error = 0;
InitByteOrder(imBinCPUByteOrder());
this->IsNew = 0;
}
void imBinSystemFile::New(const char* pFileName)
{
int mode = O_WRONLY | O_CREAT | O_TRUNC;
#ifdef O_BINARY
mode |= O_BINARY;
#endif
this->FileHandle = open(pFileName, mode, 0666); // User/Group/Other can read and write
if (this->FileHandle < 0)
this->Error = errno;
else
this->Error = 0;
InitByteOrder(imBinCPUByteOrder());
this->IsNew = 1;
}
void imBinSystemFile::Close()
{
assert(this->FileHandle > -1);
int ret = close(this->FileHandle);
if (ret < 0)
this->Error = errno;
else
this->Error = 0;
}
int imBinSystemFile::HasError() const
{
if (this->FileHandle < 0 || this->Error) return 1;
return 0;
}
unsigned long imBinSystemFile::ReadBuf(void* pValues, unsigned long pSize)
{
assert(this->FileHandle > -1);
int ret = read(this->FileHandle, pValues, (size_t)pSize);
if (ret < 0)
this->Error = errno;
else
this->Error = 0;
return ret < 0? 0: ret;
}
unsigned long imBinSystemFile::WriteBuf(void* pValues, unsigned long pSize)
{
assert(this->FileHandle > -1);
int ret = write(this->FileHandle, pValues, (size_t)pSize);
if (ret < 0)
this->Error = errno;
else
this->Error = 0;
return ret < 0? 0: ret;
}
void imBinSystemFile::SeekTo(unsigned long pOffset)
{
assert(this->FileHandle > -1);
int ret = lseek(this->FileHandle, pOffset, SEEK_SET);
if (ret < 0)
this->Error = errno;
else
this->Error = 0;
}
void imBinSystemFile::SeekOffset(long pOffset)
{
assert(this->FileHandle > -1);
int ret = lseek(this->FileHandle, pOffset, SEEK_CUR);
if (ret < 0)
this->Error = errno;
else
this->Error = 0;
}
void imBinSystemFile::SeekFrom(long pOffset)
{
assert(this->FileHandle > -1);
int ret = lseek(this->FileHandle, pOffset, SEEK_END);
if (ret < 0)
this->Error = errno;
else
this->Error = 0;
}
unsigned long imBinSystemFile::Tell() const
{
assert(this->FileHandle > -1);
long offset = lseek(this->FileHandle, 0L, SEEK_CUR);
return offset < 0? 0: offset;
}
unsigned long imBinSystemFile::FileSize()
{
assert(this->FileHandle > -1);
long lCurrentPosition = lseek(this->FileHandle, 0L, SEEK_CUR);
long lSize = lseek(this->FileHandle, 0L, SEEK_END);
lseek(this->FileHandle, lCurrentPosition, SEEK_SET);
return lSize < 0? 0: lSize;
}
int imBinSystemFile::EndOfFile() const
{
assert(this->FileHandle > -1);
long lCurrentPosition = lseek(this->FileHandle, 0L, SEEK_CUR);
long lSize = lseek(this->FileHandle, 0L, SEEK_END);
lseek(this->FileHandle, lCurrentPosition, SEEK_SET);
return lCurrentPosition == lSize? 1: 0;
}
class imBinSystemFileHandle: public imBinSystemFile
{
public:
virtual void Open(const char* pFileName);
virtual void New(const char* pFileName);
virtual void Close();
};
imBinFileBase* iBinSystemFileHandleNewFunc()
{
return new imBinSystemFileHandle();
}
void imBinSystemFileHandle::Open(const char* pFileName)
{
// the file was successfully opened already by the client
int *s = (int*)pFileName;
this->FileHandle = s[0];
InitByteOrder(imBinCPUByteOrder());
this->IsNew = 0;
this->Error = 0;
}
void imBinSystemFileHandle::New(const char* pFileName)
{
// the file was successfully opened already the client
int *s = (int*)pFileName;
this->FileHandle = s[0];
InitByteOrder(imBinCPUByteOrder());
this->IsNew = 1;
this->Error = 0;
}
void imBinSystemFileHandle::Close()
{
// does nothing, the client must close the file
}
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