michael@0: /*
michael@0:  * jmemnobs.c
michael@0:  *
michael@0:  * Copyright (C) 1992-1996, Thomas G. Lane.
michael@0:  * This file is part of the Independent JPEG Group's software.
michael@0:  * For conditions of distribution and use, see the accompanying README file.
michael@0:  *
michael@0:  * This file provides a really simple implementation of the system-
michael@0:  * dependent portion of the JPEG memory manager.  This implementation
michael@0:  * assumes that no backing-store files are needed: all required space
michael@0:  * can be obtained from malloc().
michael@0:  * This is very portable in the sense that it'll compile on almost anything,
michael@0:  * but you'd better have lots of main memory (or virtual memory) if you want
michael@0:  * to process big images.
michael@0:  * Note that the max_memory_to_use option is ignored by this implementation.
michael@0:  */
michael@0: 
michael@0: #define JPEG_INTERNALS
michael@0: #include "jinclude.h"
michael@0: #include "jpeglib.h"
michael@0: #include "jmemsys.h"		/* import the system-dependent declarations */
michael@0: 
michael@0: #ifndef HAVE_STDLIB_H		/* <stdlib.h> should declare malloc(),free() */
michael@0: extern void * malloc JPP((size_t size));
michael@0: extern void free JPP((void *ptr));
michael@0: #endif
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Memory allocation and freeing are controlled by the regular library
michael@0:  * routines malloc() and free().
michael@0:  */
michael@0: 
michael@0: GLOBAL(void *)
michael@0: jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject)
michael@0: {
michael@0:   return (void *) malloc(sizeofobject);
michael@0: }
michael@0: 
michael@0: GLOBAL(void)
michael@0: jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject)
michael@0: {
michael@0:   free(object);
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * "Large" objects are treated the same as "small" ones.
michael@0:  * NB: although we include FAR keywords in the routine declarations,
michael@0:  * this file won't actually work in 80x86 small/medium model; at least,
michael@0:  * you probably won't be able to process useful-size images in only 64KB.
michael@0:  */
michael@0: 
michael@0: GLOBAL(void FAR *)
michael@0: jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject)
michael@0: {
michael@0:   return (void FAR *) malloc(sizeofobject);
michael@0: }
michael@0: 
michael@0: GLOBAL(void)
michael@0: jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject)
michael@0: {
michael@0:   free(object);
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * This routine computes the total memory space available for allocation.
michael@0:  * Here we always say, "we got all you want bud!"
michael@0:  */
michael@0: 
michael@0: GLOBAL(size_t)
michael@0: jpeg_mem_available (j_common_ptr cinfo, size_t min_bytes_needed,
michael@0: 		    size_t max_bytes_needed, size_t already_allocated)
michael@0: {
michael@0:   return max_bytes_needed;
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Backing store (temporary file) management.
michael@0:  * Since jpeg_mem_available always promised the moon,
michael@0:  * this should never be called and we can just error out.
michael@0:  */
michael@0: 
michael@0: GLOBAL(void)
michael@0: jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info,
michael@0: 			 long total_bytes_needed)
michael@0: {
michael@0:   ERREXIT(cinfo, JERR_NO_BACKING_STORE);
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * These routines take care of any system-dependent initialization and
michael@0:  * cleanup required.  Here, there isn't any.
michael@0:  */
michael@0: 
michael@0: GLOBAL(long)
michael@0: jpeg_mem_init (j_common_ptr cinfo)
michael@0: {
michael@0:   return 0;			/* just set max_memory_to_use to 0 */
michael@0: }
michael@0: 
michael@0: GLOBAL(void)
michael@0: jpeg_mem_term (j_common_ptr cinfo)
michael@0: {
michael@0:   /* no work */
michael@0: }