mirror of
https://github.com/opencv/opencv.git
synced 2024-11-28 05:06:29 +08:00
110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
/*
|
|
* 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 */
|
|
}
|