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// --------------------------------------------------------------------------
//
// File
// Name: Guards.h
// Purpose: Classes which ensure things are closed/deleted properly when
// going out of scope. Easy exception proof code, etc
// Created: 2003/07/12
//
// --------------------------------------------------------------------------
#ifndef GUARDS__H
#define GUARDS__H
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <new>
#include "CommonException.h"
#include "Logging.h"
#include "MemLeakFindOn.h"
template <int flags = O_RDONLY | O_BINARY, int mode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)>
class FileHandleGuard
{
public:
FileHandleGuard(const std::string& rFilename)
: mOSFileHandle(::open(rFilename.c_str(), flags, mode))
{
if(mOSFileHandle < 0)
{
THROW_SYS_FILE_ERROR("Failed to open file", rFilename,
CommonException, OSFileOpenError);
}
}
~FileHandleGuard()
{
if(mOSFileHandle >= 0)
{
Close();
}
}
void Close()
{
if(mOSFileHandle < 0)
{
THROW_EXCEPTION(CommonException, FileAlreadyClosed)
}
if(::close(mOSFileHandle) != 0)
{
THROW_EXCEPTION(CommonException, OSFileCloseError)
}
mOSFileHandle = -1;
}
operator int() const
{
return mOSFileHandle;
}
private:
int mOSFileHandle;
};
template<typename type>
class MemoryBlockGuard
{
public:
MemoryBlockGuard(int BlockSize)
: mpBlock(::malloc(BlockSize)),
mBlockSize(BlockSize)
{
if(mpBlock == 0)
{
throw std::bad_alloc();
}
}
MemoryBlockGuard(void *pBlock)
: mpBlock(pBlock)
{
if(mpBlock == 0)
{
throw std::bad_alloc();
}
}
~MemoryBlockGuard()
{
free(mpBlock);
}
operator type() const
{
return (type)mpBlock;
}
type GetPtr() const
{
return (type)mpBlock;
}
void Resize(int NewSize)
{
void *ptrn = ::realloc(mpBlock, NewSize);
if(ptrn == 0)
{
throw std::bad_alloc();
}
mpBlock = ptrn;
}
void* Release()
{
void* pBlock = mpBlock;
mpBlock = ::malloc(mBlockSize);
if(mpBlock == 0)
{
throw std::bad_alloc();
}
return pBlock;
}
private:
void *mpBlock;
int mBlockSize;
};
#include "MemLeakFindOff.h"
#endif // GUARDS__H
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