97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
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/*
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* jmemnobs.c (jmemsys.c)
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*
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* Copyright (C) 1992, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file provides a really simple implementation of the system-
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* dependent portion of the JPEG memory manager. This implementation
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* assumes that no backing-store files are needed: all required space
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* can be obtained from malloc().
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* This is very portable in the sense that it'll compile on almost anything,
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* but you'd better have lots of main memory (or virtual memory) if you want
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* to process big images.
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* Note that the max_memory_to_use option is ignored by this implementation.
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*/
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#include "jinclude.h"
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#include "jmemsys.h"
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#ifdef INCLUDES_ARE_ANSI
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#include <stdlib.h> /* to declare malloc(), free() */
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#else
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extern void * malloc PP((size_t size));
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extern void free PP((void *ptr));
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#endif
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static external_methods_ptr methods; /* saved for access to error_exit */
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/*
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* Memory allocation and freeing are controlled by the regular library
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* routines malloc() and free().
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*/
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GLOBAL void *
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jget_small (size_t sizeofobject)
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{
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return (void *) malloc(sizeofobject);
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}
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GLOBAL void
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jfree_small (void * object)
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{
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free(object);
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}
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/*
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* We assume NEED_FAR_POINTERS is not defined and so the separate entry points
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* jget_large, jfree_large are not needed.
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*/
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/*
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* This routine computes the total memory space available for allocation.
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* Here we always say, "we got all you want bud!"
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*/
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GLOBAL long
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jmem_available (long min_bytes_needed, long max_bytes_needed)
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{
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return max_bytes_needed;
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}
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/*
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* Backing store (temporary file) management.
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* This should never be called and we just error out.
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*/
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GLOBAL void
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jopen_backing_store (backing_store_ptr info, long total_bytes_needed)
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{
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ERREXIT(methods, "Backing store not supported");
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}
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/*
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* These routines take care of any system-dependent initialization and
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* cleanup required. Keep in mind that jmem_term may be called more than
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* once.
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*/
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GLOBAL void
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jmem_init (external_methods_ptr emethods)
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{
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methods = emethods; /* save struct addr for error exit access */
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emethods->max_memory_to_use = 0;
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}
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GLOBAL void
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jmem_term (void)
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{
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/* no work */
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}
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