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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 }
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