jmemnobs.c

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/*
 * jmemnobs.c
 *
 * Copyright (C) 1992-1996, Thomas G. Lane.
 * Modified 2019 by Guido Vollbeding.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README 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.
 * Note that the max_memory_to_use option is respected by this implementation.
 */
 
#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() */
extern void * malloc JPP((size_t size));
extern void free JPP((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.
 * NB: although we include FAR keywords in the routine declarations,
 * this file won't actually work in 80x86 small/medium model; at least,
 * you probably won't be able to process useful-size images in only 64KB.
 */
 
GLOBAL(void FAR *)
jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
{
  return (void FAR *) malloc(sizeofobject);
}
 
GLOBAL(void)
jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
{
  free(object);
}
 
 
/*
 * This routine computes the total memory space available for allocation.
 */
 
GLOBAL(long)
jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
            long max_bytes_needed, long already_allocated)
{
  if (cinfo->mem->max_memory_to_use)
    return cinfo->mem->max_memory_to_use - already_allocated;
 
  /* Here we 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 */
}