/**

 * WinPR: Windows Portable Runtime

 * Data Alignment

 *

 * Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <stdlib.h>

#include <winpr/config.h>

#include <winpr/crt.h>

/* Data Alignment: http://msdn.microsoft.com/en-us/library/fs9stz4e/ */

#if !defined(_WIN32) || (defined(__MINGW32__) && !defined(_UCRT))

#include <stdint.h>

#include <limits.h>

#define WINPR_ALIGNED_MEM_SIGNATURE 0x0BA0BAB

#define WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(_memptr) \

  (WINPR_ALIGNED_MEM*)(((size_t)(((BYTE*)(_memptr)) - sizeof(WINPR_ALIGNED_MEM))))

#include <stdlib.h>

#include "../log.h"

#define TAG WINPR_TAG("crt")

struct winpr_aligned_mem

{

  UINT32 sig;

  size_t size;

  void* base_addr;

};

typedef struct winpr_aligned_mem WINPR_ALIGNED_MEM;

void* winpr_aligned_malloc(size_t size, size_t alignment)

{

  return winpr_aligned_offset_malloc(size, alignment, 0);

}

void* winpr_aligned_calloc(size_t count, size_t size, size_t alignment)

{

  return winpr_aligned_recalloc(NULL, count, size, alignment);

}

void* winpr_aligned_realloc(void* memblock, size_t size, size_t alignment)

{

  return winpr_aligned_offset_realloc(memblock, size, alignment, 0);

}

void* winpr_aligned_recalloc(void* memblock, size_t num, size_t size, size_t alignment)

{

  return winpr_aligned_offset_recalloc(memblock, num, size, alignment, 0);

}

void* winpr_aligned_offset_malloc(size_t size, size_t alignment, size_t offset)

{

  size_t header = 0;

  size_t alignsize = 0;

  uintptr_t basesize = 0;

  void* base = NULL;

  void* memblock = NULL;

  WINPR_ALIGNED_MEM* pMem = NULL;

  /* alignment must be a power of 2 */

  if (alignment % 2 == 1)

    return NULL;

  /* offset must be less than size */

  if (offset >= size)

    return NULL;

  /* minimum alignment is pointer size */

  if (alignment < sizeof(void*))

    alignment = sizeof(void*);

  if (alignment > SIZE_MAX - sizeof(WINPR_ALIGNED_MEM))

    return NULL;

  header = sizeof(WINPR_ALIGNED_MEM) + alignment;

  if (size > SIZE_MAX - header)

    return NULL;

  alignsize = size + header;

  /* malloc size + alignment to make sure we can align afterwards */

#if defined(_ISOC11_SOURCE)

  base = aligned_alloc(alignment, alignsize);

#elif defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200112L) || (_XOPEN_SOURCE >= 600)

  if (posix_memalign(&base, alignment, alignsize) != 0)

    return NULL;

#else

  base = malloc(alignsize);

#endif

  if (!base)

    return NULL;

  basesize = (uintptr_t)base;

  if ((offset > UINTPTR_MAX) || (header > UINTPTR_MAX - offset) ||

      (basesize > UINTPTR_MAX - header - offset))

  {

    free(base);

    return NULL;

  }

  memblock = (void*)(((basesize + header + offset) & ~(alignment - 1)) - offset);

  pMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(memblock);

  pMem->sig = WINPR_ALIGNED_MEM_SIGNATURE;

  pMem->base_addr = base;

  pMem->size = size;

  return memblock;

}

void* winpr_aligned_offset_realloc(void* memblock, size_t size, size_t alignment, size_t offset)

{

  size_t copySize = 0;

  void* newMemblock = NULL;

  WINPR_ALIGNED_MEM* pMem = NULL;

  WINPR_ALIGNED_MEM* pNewMem = NULL;

  if (!memblock)

    return winpr_aligned_offset_malloc(size, alignment, offset);

  pMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(memblock);

  if (pMem->sig != WINPR_ALIGNED_MEM_SIGNATURE)

  {

    WLog_ERR(TAG,

             "_aligned_offset_realloc: memory block was not allocated by _aligned_malloc!");

    return NULL;

  }

  if (size == 0)

  {

    winpr_aligned_free(memblock);

    return NULL;

  }

  newMemblock = winpr_aligned_offset_malloc(size, alignment, offset);

  if (!newMemblock)

    return NULL;

  pNewMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(newMemblock);

  copySize = (pNewMem->size < pMem->size) ? pNewMem->size : pMem->size;

  CopyMemory(newMemblock, memblock, copySize);

  winpr_aligned_free(memblock);

  return newMemblock;

}

static INLINE size_t cMIN(size_t a, size_t b)

{

  if (a > b)

    return b;

  return a;

}

void* winpr_aligned_offset_recalloc(void* memblock, size_t num, size_t size, size_t alignment,

                                    size_t offset)

{

  char* newMemblock = NULL;

  WINPR_ALIGNED_MEM* pMem = NULL;

  WINPR_ALIGNED_MEM* pNewMem = NULL;

  if (!memblock)

  {

    newMemblock = winpr_aligned_offset_malloc(size * num, alignment, offset);

    if (newMemblock)

    {

      pNewMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(newMemblock);

      ZeroMemory(newMemblock, pNewMem->size);

    }

    return newMemblock;

  }

  pMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(memblock);

  if (pMem->sig != WINPR_ALIGNED_MEM_SIGNATURE)

  {

    WLog_ERR(TAG,

             "_aligned_offset_recalloc: memory block was not allocated by _aligned_malloc!");

    goto fail;

  }

  if ((num == 0) || (size == 0))

    goto fail;

  if (pMem->size > (1ull * num * size) + alignment)

    return memblock;

  newMemblock = winpr_aligned_offset_malloc(size * num, alignment, offset);

  if (!newMemblock)

    goto fail;

  pNewMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(newMemblock);

  {

    const size_t csize = cMIN(pMem->size, pNewMem->size);

    memcpy(newMemblock, memblock, csize);

    ZeroMemory(newMemblock + csize, pNewMem->size - csize);

  }

fail:

  winpr_aligned_free(memblock);

  return newMemblock;

}

size_t winpr_aligned_msize(void* memblock, WINPR_ATTR_UNUSED size_t alignment,

                           WINPR_ATTR_UNUSED size_t offset)

{

  WINPR_ALIGNED_MEM* pMem = NULL;

  if (!memblock)

    return 0;

  pMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(memblock);

  if (pMem->sig != WINPR_ALIGNED_MEM_SIGNATURE)

  {

    WLog_ERR(TAG, "_aligned_msize: memory block was not allocated by _aligned_malloc!");

    return 0;

  }

  return pMem->size;

}

void winpr_aligned_free(void* memblock)

{

  WINPR_ALIGNED_MEM* pMem = NULL;

  if (!memblock)

    return;

  pMem = WINPR_ALIGNED_MEM_STRUCT_FROM_PTR(memblock);

  if (pMem->sig != WINPR_ALIGNED_MEM_SIGNATURE)

  {

    WLog_ERR(TAG, "_aligned_free: memory block was not allocated by _aligned_malloc!");

    return;

  }

  free(pMem->base_addr);

}

#endif /* _WIN32 */