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109 lines
2.7 KiB
109 lines
2.7 KiB
/* |
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* jmemnobs.c |
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* |
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* Copyright (C) 1992-1996, 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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#define JPEG_INTERNALS |
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#include "jinclude.h" |
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#include "jpeglib.h" |
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#include "jmemsys.h" /* import the system-dependent declarations */ |
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#ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */ |
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extern void * malloc JPP((size_t size)); |
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extern void free JPP((void *ptr)); |
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#endif |
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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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jpeg_get_small (j_common_ptr cinfo, 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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jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject) |
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{ |
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free(object); |
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} |
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/* |
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* "Large" objects are treated the same as "small" ones. |
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* NB: although we include FAR keywords in the routine declarations, |
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* this file won't actually work in 80x86 small/medium model; at least, |
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* you probably won't be able to process useful-size images in only 64KB. |
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*/ |
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GLOBAL(void FAR *) |
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jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject) |
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{ |
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return (void FAR *) malloc(sizeofobject); |
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} |
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GLOBAL(void) |
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jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject) |
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{ |
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free(object); |
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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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jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed, |
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long max_bytes_needed, long already_allocated) |
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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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* Since jpeg_mem_available always promised the moon, |
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* this should never be called and we can just error out. |
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*/ |
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GLOBAL(void) |
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jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info, |
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long total_bytes_needed) |
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{ |
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ERREXIT(cinfo, JERR_NO_BACKING_STORE); |
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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. Here, there isn't any. |
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*/ |
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GLOBAL(long) |
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jpeg_mem_init (j_common_ptr cinfo) |
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{ |
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return 0; /* just set max_memory_to_use to 0 */ |
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} |
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GLOBAL(void) |
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jpeg_mem_term (j_common_ptr cinfo) |
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{ |
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/* no work */ |
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}
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