0,0 → 1,109 |
/* |
* 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 */ |
} |