/*

 * jmemnobs.c

 *

 * This file was part of the Independent JPEG Group's software:

 * Copyright (C) 1992-1996, Thomas G. Lane.

 * libjpeg-turbo Modifications:

 * Copyright (C) 2017-2018, D. R. Commander.

 * For conditions of distribution and use, see the accompanying README.ijg

 * file.

 *

 * This file provides a really simple implementation of the system-

 * dependent portion of the JPEG memory manager.  This implementation

 * assumes that no backing-store files are needed: all required space

 * can be obtained from malloc().

 * This is very portable in the sense that it'll compile on almost anything,

 * but you'd better have lots of main memory (or virtual memory) if you want

 * to process big images.

 */

#define JPEG_INTERNALS

#include "jinclude.h"

#include "jpeglib.h"

#include "jmemsys.h"            /* import the system-dependent declarations */

#ifndef HAVE_STDLIB_H           /* <stdlib.h> should declare malloc(),free() */</stdlib.h>

extern void *malloc(size_t size);

extern void free(void *ptr);

#endif

/*

 * Memory allocation and freeing are controlled by the regular library

 * routines malloc() and free().

 */

GLOBAL(void *)

jpeg_get_small(j_common_ptr cinfo, size_t sizeofobject)

{

  return (void *)malloc(sizeofobject);

}

GLOBAL(void)

jpeg_free_small(j_common_ptr cinfo, void *object, size_t sizeofobject)

{

  free(object);

}

/*

 * "Large" objects are treated the same as "small" ones.

 */

GLOBAL(void *)

jpeg_get_large(j_common_ptr cinfo, size_t sizeofobject)

{

  return (void *)malloc(sizeofobject);

}

GLOBAL(void)

jpeg_free_large(j_common_ptr cinfo, void *object, size_t sizeofobject)

{

  free(object);

}

/*

 * This routine computes the total memory space available for allocation.

 */

GLOBAL(size_t)

jpeg_mem_available(j_common_ptr cinfo, size_t min_bytes_needed,

                   size_t max_bytes_needed, size_t already_allocated)

{

  if (cinfo->mem->max_memory_to_use) {

    if ((size_t)cinfo->mem->max_memory_to_use > already_allocated)

      return cinfo->mem->max_memory_to_use - already_allocated;

    else

      return 0;

  } else {

    /* Here we always say, "we got all you want bud!" */

    return max_bytes_needed;

  }

}

/*

 * Backing store (temporary file) management.

 * Since jpeg_mem_available always promised the moon,

 * this should never be called and we can just error out.

 */

GLOBAL(void)

jpeg_open_backing_store(j_common_ptr cinfo, backing_store_ptr info,

                        long total_bytes_needed)

{

  ERREXIT(cinfo, JERR_NO_BACKING_STORE);

}

/*

 * These routines take care of any system-dependent initialization and

 * cleanup required.  Here, there isn't any.

 */

GLOBAL(long)

jpeg_mem_init(j_common_ptr cinfo)

{

  return 0;                     /* just set max_memory_to_use to 0 */

}

GLOBAL(void)

jpeg_mem_term(j_common_ptr cinfo)

{

  /* no work */

}