4 * Copyright (C) 1992-1996, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file.
8 * This file provides a really simple implementation of the system-
9 * dependent portion of the JPEG memory manager. This implementation
10 * assumes that no backing-store files are needed: all required space
11 * can be obtained from malloc().
12 * This is very portable in the sense that it'll compile on almost anything,
13 * but you'd better have lots of main memory (or virtual memory) if you want
14 * to process big images.
15 * Note that the max_memory_to_use option is ignored by this implementation.
18 #define JPEG_INTERNALS
21 #include "jmemsys.h" /* import the system-dependent declarations */
23 #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */
24 extern void * malloc JPP((size_t size));
25 extern void free JPP((void *ptr));
30 * Memory allocation and freeing are controlled by the regular library
31 * routines malloc() and free().
35 jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
38 return (void *) malloc(sizeofobject);
42 jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
51 * "Large" objects are treated the same as "small" ones.
52 * NB: although we include FAR keywords in the routine declarations,
53 * this file won't actually work in 80x86 small/medium model; at least,
54 * you probably won't be able to process useful-size images in only 64KB.
58 jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
61 return (void FAR *) malloc(sizeofobject);
65 jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
74 * This routine computes the total memory space available for allocation.
75 * Here we always say, "we got all you want bud!"
79 jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed,
80 long max_bytes_needed, long already_allocated)
84 already_allocated = 0;
85 return max_bytes_needed;
90 * Backing store (temporary file) management.
91 * Since jpeg_mem_available always promised the moon,
92 * this should never be called and we can just error out.
96 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
97 long total_bytes_needed)
100 total_bytes_needed = 0;
101 ERREXIT(cinfo, JERR_NO_BACKING_STORE);
106 * These routines take care of any system-dependent initialization and
107 * cleanup required. Here, there isn't any.
111 jpeg_mem_init (j_common_ptr cinfo)
114 return 0; /* just set max_memory_to_use to 0 */
118 jpeg_mem_term (j_common_ptr cinfo)