/src/libjpeg-turbo/jcomapi.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * jcomapi.c |
3 | | * |
4 | | * This file was part of the Independent JPEG Group's software: |
5 | | * Copyright (C) 1994-1997, Thomas G. Lane. |
6 | | * libjpeg-turbo Modifications: |
7 | | * Copyright (C) 2024, D. R. Commander. |
8 | | * For conditions of distribution and use, see the accompanying README.ijg |
9 | | * file. |
10 | | * |
11 | | * This file contains application interface routines that are used for both |
12 | | * compression and decompression. |
13 | | */ |
14 | | |
15 | | #define JPEG_INTERNALS |
16 | | #include "jinclude.h" |
17 | | #include "jpeglib.h" |
18 | | |
19 | | |
20 | | /* |
21 | | * Abort processing of a JPEG compression or decompression operation, |
22 | | * but don't destroy the object itself. |
23 | | * |
24 | | * For this, we merely clean up all the nonpermanent memory pools. |
25 | | * Note that temp files (virtual arrays) are not allowed to belong to |
26 | | * the permanent pool, so we will be able to close all temp files here. |
27 | | * Closing a data source or destination, if necessary, is the application's |
28 | | * responsibility. |
29 | | */ |
30 | | |
31 | | GLOBAL(void) |
32 | | jpeg_abort(j_common_ptr cinfo) |
33 | 0 | { |
34 | 0 | int pool; |
35 | | |
36 | | /* Do nothing if called on a not-initialized or destroyed JPEG object. */ |
37 | 0 | if (cinfo->mem == NULL) |
38 | 0 | return; |
39 | | |
40 | | /* Releasing pools in reverse order might help avoid fragmentation |
41 | | * with some (brain-damaged) malloc libraries. |
42 | | */ |
43 | 0 | for (pool = JPOOL_NUMPOOLS - 1; pool > JPOOL_PERMANENT; pool--) { |
44 | 0 | (*cinfo->mem->free_pool) (cinfo, pool); |
45 | 0 | } |
46 | | |
47 | | /* Reset overall state for possible reuse of object */ |
48 | 0 | if (cinfo->is_decompressor) { |
49 | 0 | cinfo->global_state = DSTATE_START; |
50 | | /* Try to keep application from accessing now-deleted marker list. |
51 | | * A bit kludgy to do it here, but this is the most central place. |
52 | | */ |
53 | 0 | ((j_decompress_ptr)cinfo)->marker_list = NULL; |
54 | 0 | ((j_decompress_ptr)cinfo)->master->marker_list_end = NULL; |
55 | 0 | } else { |
56 | 0 | cinfo->global_state = CSTATE_START; |
57 | 0 | } |
58 | 0 | } |
59 | | |
60 | | |
61 | | /* |
62 | | * Destruction of a JPEG object. |
63 | | * |
64 | | * Everything gets deallocated except the master jpeg_compress_struct itself |
65 | | * and the error manager struct. Both of these are supplied by the application |
66 | | * and must be freed, if necessary, by the application. (Often they are on |
67 | | * the stack and so don't need to be freed anyway.) |
68 | | * Closing a data source or destination, if necessary, is the application's |
69 | | * responsibility. |
70 | | */ |
71 | | |
72 | | GLOBAL(void) |
73 | | jpeg_destroy(j_common_ptr cinfo) |
74 | 0 | { |
75 | | /* We need only tell the memory manager to release everything. */ |
76 | | /* NB: mem pointer is NULL if memory mgr failed to initialize. */ |
77 | 0 | if (cinfo->mem != NULL) |
78 | 0 | (*cinfo->mem->self_destruct) (cinfo); |
79 | 0 | cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */ |
80 | 0 | cinfo->global_state = 0; /* mark it destroyed */ |
81 | 0 | } |
82 | | |
83 | | |
84 | | /* |
85 | | * Convenience routines for allocating quantization and Huffman tables. |
86 | | * (Would jutils.c be a more reasonable place to put these?) |
87 | | */ |
88 | | |
89 | | GLOBAL(JQUANT_TBL *) |
90 | | jpeg_alloc_quant_table(j_common_ptr cinfo) |
91 | 0 | { |
92 | 0 | JQUANT_TBL *tbl; |
93 | |
|
94 | 0 | tbl = (JQUANT_TBL *) |
95 | 0 | (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, sizeof(JQUANT_TBL)); |
96 | 0 | tbl->sent_table = FALSE; /* make sure this is false in any new table */ |
97 | 0 | return tbl; |
98 | 0 | } |
99 | | |
100 | | |
101 | | GLOBAL(JHUFF_TBL *) |
102 | | jpeg_alloc_huff_table(j_common_ptr cinfo) |
103 | 0 | { |
104 | 0 | JHUFF_TBL *tbl; |
105 | |
|
106 | 0 | tbl = (JHUFF_TBL *) |
107 | 0 | (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, sizeof(JHUFF_TBL)); |
108 | 0 | tbl->sent_table = FALSE; /* make sure this is false in any new table */ |
109 | 0 | return tbl; |
110 | 0 | } |