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| 1 /* |
| 2 * jmemnobs.c |
| 3 * |
| 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. |
| 7 * |
| 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. |
| 16 */ |
| 17 |
| 18 #define JPEG_INTERNALS |
| 19 #include "jinclude.h" |
| 20 #include "jpeglib.h" |
| 21 #include "jmemsys.h" /* import the system-dependent declarations */ |
| 22 |
| 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)); |
| 26 #endif |
| 27 |
| 28 |
| 29 /* |
| 30 * Memory allocation and freeing are controlled by the regular library |
| 31 * routines malloc() and free(). |
| 32 */ |
| 33 |
| 34 GLOBAL(void *) |
| 35 jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject) |
| 36 { |
| 37 return (void *) malloc(sizeofobject); |
| 38 } |
| 39 |
| 40 GLOBAL(void) |
| 41 jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject) |
| 42 { |
| 43 free(object); |
| 44 } |
| 45 |
| 46 |
| 47 /* |
| 48 * "Large" objects are treated the same as "small" ones. |
| 49 * NB: although we include FAR keywords in the routine declarations, |
| 50 * this file won't actually work in 80x86 small/medium model; at least, |
| 51 * you probably won't be able to process useful-size images in only 64KB. |
| 52 */ |
| 53 |
| 54 GLOBAL(void FAR *) |
| 55 jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject) |
| 56 { |
| 57 return (void FAR *) malloc(sizeofobject); |
| 58 } |
| 59 |
| 60 GLOBAL(void) |
| 61 jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject) |
| 62 { |
| 63 free(object); |
| 64 } |
| 65 |
| 66 |
| 67 /* |
| 68 * This routine computes the total memory space available for allocation. |
| 69 * Here we always say, "we got all you want bud!" |
| 70 */ |
| 71 |
| 72 GLOBAL(size_t) |
| 73 jpeg_mem_available (j_common_ptr cinfo, size_t min_bytes_needed, |
| 74 size_t max_bytes_needed, size_t already_allocated) |
| 75 { |
| 76 return max_bytes_needed; |
| 77 } |
| 78 |
| 79 |
| 80 /* |
| 81 * Backing store (temporary file) management. |
| 82 * Since jpeg_mem_available always promised the moon, |
| 83 * this should never be called and we can just error out. |
| 84 */ |
| 85 |
| 86 GLOBAL(void) |
| 87 jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info, |
| 88 long total_bytes_needed) |
| 89 { |
| 90 ERREXIT(cinfo, JERR_NO_BACKING_STORE); |
| 91 } |
| 92 |
| 93 |
| 94 /* |
| 95 * These routines take care of any system-dependent initialization and |
| 96 * cleanup required. Here, there isn't any. |
| 97 */ |
| 98 |
| 99 GLOBAL(long) |
| 100 jpeg_mem_init (j_common_ptr cinfo) |
| 101 { |
| 102 return 0; /* just set max_memory_to_use to 0 */ |
| 103 } |
| 104 |
| 105 GLOBAL(void) |
| 106 jpeg_mem_term (j_common_ptr cinfo) |
| 107 { |
| 108 /* no work */ |
| 109 } |
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