/src/libjpeg-turbo.2.0.x/jmemnobs.c
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1 | | /* |
2 | | * jmemnobs.c |
3 | | * |
4 | | * This file was part of the Independent JPEG Group's software: |
5 | | * Copyright (C) 1992-1996, Thomas G. Lane. |
6 | | * libjpeg-turbo Modifications: |
7 | | * Copyright (C) 2017-2018, D. R. Commander. |
8 | | * For conditions of distribution and use, see the accompanying README.ijg |
9 | | * file. |
10 | | * |
11 | | * This file provides a really simple implementation of the system- |
12 | | * dependent portion of the JPEG memory manager. This implementation |
13 | | * assumes that no backing-store files are needed: all required space |
14 | | * can be obtained from malloc(). |
15 | | * This is very portable in the sense that it'll compile on almost anything, |
16 | | * but you'd better have lots of main memory (or virtual memory) if you want |
17 | | * to process big images. |
18 | | */ |
19 | | |
20 | | #define JPEG_INTERNALS |
21 | | #include "jinclude.h" |
22 | | #include "jpeglib.h" |
23 | | #include "jmemsys.h" /* import the system-dependent declarations */ |
24 | | |
25 | | #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc(),free() */ |
26 | | extern void *malloc(size_t size); |
27 | | extern void free(void *ptr); |
28 | | #endif |
29 | | |
30 | | |
31 | | /* |
32 | | * Memory allocation and freeing are controlled by the regular library |
33 | | * routines malloc() and free(). |
34 | | */ |
35 | | |
36 | | GLOBAL(void *) |
37 | | jpeg_get_small(j_common_ptr cinfo, size_t sizeofobject) |
38 | 1.29M | { |
39 | 1.29M | return (void *)malloc(sizeofobject); |
40 | 1.29M | } |
41 | | |
42 | | GLOBAL(void) |
43 | | jpeg_free_small(j_common_ptr cinfo, void *object, size_t sizeofobject) |
44 | 1.29M | { |
45 | 1.29M | free(object); |
46 | 1.29M | } |
47 | | |
48 | | |
49 | | /* |
50 | | * "Large" objects are treated the same as "small" ones. |
51 | | */ |
52 | | |
53 | | GLOBAL(void *) |
54 | | jpeg_get_large(j_common_ptr cinfo, size_t sizeofobject) |
55 | 1.68M | { |
56 | 1.68M | return (void *)malloc(sizeofobject); |
57 | 1.68M | } |
58 | | |
59 | | GLOBAL(void) |
60 | | jpeg_free_large(j_common_ptr cinfo, void *object, size_t sizeofobject) |
61 | 1.68M | { |
62 | 1.68M | free(object); |
63 | 1.68M | } |
64 | | |
65 | | |
66 | | /* |
67 | | * This routine computes the total memory space available for allocation. |
68 | | */ |
69 | | |
70 | | GLOBAL(size_t) |
71 | | jpeg_mem_available(j_common_ptr cinfo, size_t min_bytes_needed, |
72 | | size_t max_bytes_needed, size_t already_allocated) |
73 | 99.8k | { |
74 | 99.8k | if (cinfo->mem->max_memory_to_use) { |
75 | 0 | if ((size_t)cinfo->mem->max_memory_to_use > already_allocated) |
76 | 0 | return cinfo->mem->max_memory_to_use - already_allocated; |
77 | 0 | else |
78 | 0 | return 0; |
79 | 99.8k | } else { |
80 | | /* Here we always say, "we got all you want bud!" */ |
81 | 99.8k | return max_bytes_needed; |
82 | 99.8k | } |
83 | 99.8k | } |
84 | | |
85 | | |
86 | | /* |
87 | | * Backing store (temporary file) management. |
88 | | * Since jpeg_mem_available always promised the moon, |
89 | | * this should never be called and we can just error out. |
90 | | */ |
91 | | |
92 | | GLOBAL(void) |
93 | | jpeg_open_backing_store(j_common_ptr cinfo, backing_store_ptr info, |
94 | | long total_bytes_needed) |
95 | 0 | { |
96 | 0 | ERREXIT(cinfo, JERR_NO_BACKING_STORE); |
97 | 0 | } |
98 | | |
99 | | |
100 | | /* |
101 | | * These routines take care of any system-dependent initialization and |
102 | | * cleanup required. Here, there isn't any. |
103 | | */ |
104 | | |
105 | | GLOBAL(long) |
106 | | jpeg_mem_init(j_common_ptr cinfo) |
107 | 317k | { |
108 | 317k | return 0; /* just set max_memory_to_use to 0 */ |
109 | 317k | } |
110 | | |
111 | | GLOBAL(void) |
112 | | jpeg_mem_term(j_common_ptr cinfo) |
113 | 317k | { |
114 | | /* no work */ |
115 | 317k | } |