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/*
* jmemnobs.c
*
* Copyright (C) 1992-1996, Thomas G. Lane.
* 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 ignored 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.
* Here we always say, "we got all you want bud!"
*/
GLOBAL
(long)
jpeg_mem_available
(j_common_ptr cinfo
, long min_bytes_needed
,
long max_bytes_needed
, long already_allocated
)
{
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 */
}