JMEMNOBS.c
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上传日期:2022-08-08
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- ////////////////////////////////////////////////////////////////////////
- //
- // Note : this file is included as part of the Smaller Animals Software
- // JpegFile package. Though this file has not been modified from it's
- // original IJG 6a form, it is not the responsibility on the Independent
- // JPEG Group to answer questions regarding this code.
- //
- // Any questions you have about this code should be addressed to :
- //
- // CHRISDL@PAGESZ.NET - the distributor of this package.
- //
- // Remember, by including this code in the JpegFile package, Smaller
- // Animals Software assumes all responsibilities for answering questions
- // about it. If we (SA Software) can't answer your questions ourselves, we
- // will direct you to people who can.
- //
- // Thanks, CDL.
- //
- ////////////////////////////////////////////////////////////////////////
- /*
- * 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 */
- }