Alloc.h

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/* Alloc.h -- Memory allocation functions
2024-01-22 : Igor Pavlov : Public domain */
 
#ifndef ZIP7_INC_ALLOC_H
#define ZIP7_INC_ALLOC_H
 
#include "7zTypes.h"
 
EXTERN_C_BEGIN
 
/*
  MyFree(NULL)        : is allowed, as free(NULL)
  MyAlloc(0)          : returns NULL : but malloc(0)        is allowed to return NULL or non_NULL
  MyRealloc(NULL, 0)  : returns NULL : but realloc(NULL, 0) is allowed to return NULL or non_NULL
MyRealloc() is similar to realloc() for the following cases:
  MyRealloc(non_NULL, 0)         : returns NULL and always calls MyFree(ptr)
  MyRealloc(NULL, non_ZERO)      : returns NULL, if allocation failed
  MyRealloc(non_NULL, non_ZERO)  : returns NULL, if reallocation failed
*/
 
void *MyAlloc(size_t size);
void MyFree(void *address);
void *MyRealloc(void *address, size_t size);
 
void *z7_AlignedAlloc(size_t size);
void  z7_AlignedFree(void *p);
 
#ifdef _WIN32
 
#ifdef Z7_LARGE_PAGES
void SetLargePageSize(void);
#endif
 
void *MidAlloc(size_t size);
void MidFree(void *address);
void *BigAlloc(size_t size);
void BigFree(void *address);
 
/* #define Z7_BIG_ALLOC_IS_ZERO_FILLED */
 
#else
 
#define MidAlloc(size)    z7_AlignedAlloc(size)
#define MidFree(address)  z7_AlignedFree(address)
#define BigAlloc(size)    z7_AlignedAlloc(size)
#define BigFree(address)  z7_AlignedFree(address)
 
#endif
 
extern const ISzAlloc g_Alloc;
 
#ifdef _WIN32
extern const ISzAlloc g_BigAlloc;
extern const ISzAlloc g_MidAlloc;
#else
#define g_BigAlloc g_AlignedAlloc
#define g_MidAlloc g_AlignedAlloc
#endif
 
extern const ISzAlloc g_AlignedAlloc;
 
 
typedef struct
{
  ISzAlloc vt;
  ISzAllocPtr baseAlloc;
  unsigned numAlignBits; /* ((1 << numAlignBits) >= sizeof(void *)) */
  size_t offset;         /* (offset == (k * sizeof(void *)) && offset < (1 << numAlignBits) */
} CAlignOffsetAlloc;
 
void AlignOffsetAlloc_CreateVTable(CAlignOffsetAlloc *p);
 
 
EXTERN_C_END
 
#endif