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// Common/MyBuffer2.h
#ifndef __COMMON_MY_BUFFER2_H
#define __COMMON_MY_BUFFER2_H
#include "../../C/Alloc.h"
#include "MyTypes.h"
class CMidBuffer
{
Byte *_data;
size_t _size;
CLASS_NO_COPY(CMidBuffer)
public:
CMidBuffer(): _data(NULL), _size(0) {}
~CMidBuffer() { ::MidFree(_data); }
void Free() { ::MidFree(_data); _data = NULL; _size = 0; }
bool IsAllocated() const { return _data != NULL; }
operator Byte *() { return _data; }
operator const Byte *() const { return _data; }
size_t Size() const { return _size; }
void Alloc(size_t size)
{
if (!_data || size != _size)
{
::MidFree(_data);
_size = 0;
_data = NULL;
_data = (Byte *)::MidAlloc(size);
if (_data)
_size = size;
}
}
void AllocAtLeast(size_t size)
{
if (!_data || size > _size)
{
::MidFree(_data);
const size_t kMinSize = (size_t)1 << 16;
if (size < kMinSize)
size = kMinSize;
_size = 0;
_data = NULL;
_data = (Byte *)::MidAlloc(size);
if (_data)
_size = size;
}
}
};
class CAlignedBuffer
{
Byte *_data;
size_t _size;
CLASS_NO_COPY(CAlignedBuffer)
public:
CAlignedBuffer(): _data(NULL), _size(0) {}
~CAlignedBuffer()
{
ISzAlloc_Free(&g_AlignedAlloc, _data);
}
CAlignedBuffer(size_t size): _size(0)
{
_data = NULL;
_data = (Byte *)ISzAlloc_Alloc(&g_AlignedAlloc, size);
if (!_data)
throw 1;
_size = size;
}
void Free()
{
ISzAlloc_Free(&g_AlignedAlloc, _data);
_data = NULL;
_size = 0;
}
bool IsAllocated() const { return _data != NULL; }
operator Byte *() { return _data; }
operator const Byte *() const { return _data; }
size_t Size() const { return _size; }
void Alloc(size_t size)
{
if (!_data || size != _size)
{
ISzAlloc_Free(&g_AlignedAlloc, _data);
_size = 0;
_data = NULL;
_data = (Byte *)ISzAlloc_Alloc(&g_AlignedAlloc, size);
if (_data)
_size = size;
}
}
void AllocAtLeast(size_t size)
{
if (!_data || size > _size)
{
ISzAlloc_Free(&g_AlignedAlloc, _data);
_size = 0;
_data = NULL;
_data = (Byte *)ISzAlloc_Alloc(&g_AlignedAlloc, size);
if (_data)
_size = size;
}
}
};
/*
CMidAlignedBuffer must return aligned pointer.
- in Windows it uses CMidBuffer(): MidAlloc() : VirtualAlloc()
VirtualAlloc(): Memory allocated is automatically initialized to zero.
MidAlloc(0) returns NULL
- in non-Windows systems it uses g_AlignedAlloc.
g_AlignedAlloc::Alloc(size = 0) can return non NULL.
*/
typedef
#ifdef _WIN32
CMidBuffer
#else
CAlignedBuffer
#endif
CMidAlignedBuffer;
#endif
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