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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6417 | ashmew2 | 1 | /* |
| 2 | * jmemnobs.c |
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| 3 | * |
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| 4 | * Copyright (C) 1992-1996, Thomas G. Lane. |
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| 5 | * This file is part of the Independent JPEG Group's software. |
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| 6 | * For conditions of distribution and use, see the accompanying README file. |
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| 7 | * |
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| 8 | * This file provides a really simple implementation of the system- |
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| 9 | * dependent portion of the JPEG memory manager. This implementation |
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| 10 | * assumes that no backing-store files are needed: all required space |
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| 11 | * can be obtained from malloc(). |
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| 12 | * This is very portable in the sense that it'll compile on almost anything, |
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| 13 | * but you'd better have lots of main memory (or virtual memory) if you want |
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| 14 | * to process big images. |
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| 15 | * Note that the max_memory_to_use option is ignored by this implementation. |
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| 16 | */ |
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| 17 | |||
| 18 | #define JPEG_INTERNALS |
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| 19 | #include "jinclude.h" |
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| 20 | #include "jpeglib.h" |
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| 21 | #include "jmemsys.h" /* import the system-dependent declarations */ |
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| 22 | |||
| 23 | #ifndef HAVE_STDLIB_H /* |
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| 24 | extern void * malloc JPP((size_t size)); |
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| 25 | extern void free JPP((void *ptr)); |
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| 26 | #endif |
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| 27 | |||
| 28 | |||
| 29 | /* |
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| 30 | * Memory allocation and freeing are controlled by the regular library |
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| 31 | * routines malloc() and free(). |
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| 32 | */ |
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| 33 | |||
| 34 | GLOBAL(void *) |
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| 35 | jpeg_get_small (j_common_ptr cinfo, size_t sizeofobject) |
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| 36 | { |
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| 37 | return (void *) malloc(sizeofobject); |
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| 38 | } |
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| 39 | |||
| 40 | GLOBAL(void) |
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| 41 | jpeg_free_small (j_common_ptr cinfo, void * object, size_t sizeofobject) |
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| 42 | { |
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| 43 | free(object); |
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| 44 | } |
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| 45 | |||
| 46 | |||
| 47 | /* |
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| 48 | * "Large" objects are treated the same as "small" ones. |
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| 49 | * NB: although we include FAR keywords in the routine declarations, |
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| 50 | * this file won't actually work in 80x86 small/medium model; at least, |
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| 51 | * you probably won't be able to process useful-size images in only 64KB. |
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| 52 | */ |
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| 53 | |||
| 54 | GLOBAL(void FAR *) |
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| 55 | jpeg_get_large (j_common_ptr cinfo, size_t sizeofobject) |
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| 56 | { |
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| 57 | return (void FAR *) malloc(sizeofobject); |
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| 58 | } |
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| 59 | |||
| 60 | GLOBAL(void) |
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| 61 | jpeg_free_large (j_common_ptr cinfo, void FAR * object, size_t sizeofobject) |
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| 62 | { |
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| 63 | free(object); |
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| 64 | } |
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| 65 | |||
| 66 | |||
| 67 | /* |
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| 68 | * This routine computes the total memory space available for allocation. |
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| 69 | * Here we always say, "we got all you want bud!" |
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| 70 | */ |
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| 71 | |||
| 72 | GLOBAL(long) |
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| 73 | jpeg_mem_available (j_common_ptr cinfo, long min_bytes_needed, |
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| 74 | long max_bytes_needed, long already_allocated) |
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| 75 | { |
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| 76 | return max_bytes_needed; |
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| 77 | } |
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| 78 | |||
| 79 | |||
| 80 | /* |
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| 81 | * Backing store (temporary file) management. |
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| 82 | * Since jpeg_mem_available always promised the moon, |
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| 83 | * this should never be called and we can just error out. |
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| 84 | */ |
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| 85 | |||
| 86 | GLOBAL(void) |
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| 87 | jpeg_open_backing_store (j_common_ptr cinfo, backing_store_ptr info, |
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| 88 | long total_bytes_needed) |
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| 89 | { |
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| 90 | ERREXIT(cinfo, JERR_NO_BACKING_STORE); |
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| 91 | } |
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| 92 | |||
| 93 | |||
| 94 | /* |
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| 95 | * These routines take care of any system-dependent initialization and |
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| 96 | * cleanup required. Here, there isn't any. |
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| 97 | */ |
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| 98 | |||
| 99 | GLOBAL(long) |
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| 100 | jpeg_mem_init (j_common_ptr cinfo) |
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| 101 | { |
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| 102 | return 0; /* just set max_memory_to_use to 0 */ |
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| 103 | } |
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| 104 | |||
| 105 | GLOBAL(void) |
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| 106 | jpeg_mem_term (j_common_ptr cinfo) |
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| 107 | { |
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| 108 | /* no work */ |
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| 109 | } |