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1 /* |
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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 |
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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 |
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23 #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */ |
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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 |
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28 |
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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 |
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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 |
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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 |
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46 |
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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 |
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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 |
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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 |
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66 |
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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 |
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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 |
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79 |
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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 |
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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 |
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93 |
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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 |
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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 |
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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 } |