/src/gdal/build/frmts/jpeg/libjpeg12/jcomapi12.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * jcomapi.c |
3 | | * |
4 | | * Copyright (C) 1994-1997, Thomas G. Lane. |
5 | | * This file is part of the Independent JPEG Group's software. |
6 | | * For conditions of distribution and use, see the accompanying README file. |
7 | | * |
8 | | * This file contains application interface routines that are used for both |
9 | | * compression and decompression. |
10 | | */ |
11 | | |
12 | | #define JPEG_INTERNALS |
13 | | #include "jinclude.h" |
14 | | #include "jpeglib.h" |
15 | | |
16 | | |
17 | | /* |
18 | | * Abort processing of a JPEG compression or decompression operation, |
19 | | * but don't destroy the object itself. |
20 | | * |
21 | | * For this, we merely clean up all the nonpermanent memory pools. |
22 | | * Note that temp files (virtual arrays) are not allowed to belong to |
23 | | * the permanent pool, so we will be able to close all temp files here. |
24 | | * Closing a data source or destination, if necessary, is the application's |
25 | | * responsibility. |
26 | | */ |
27 | | |
28 | | GLOBAL(void) |
29 | | jpeg_abort (j_common_ptr cinfo) |
30 | 0 | { |
31 | 0 | int pool; |
32 | | |
33 | | /* Do nothing if called on a not-initialized or destroyed JPEG object. */ |
34 | 0 | if (cinfo->mem == NULL) |
35 | 0 | return; |
36 | | |
37 | | /* Releasing pools in reverse order might help avoid fragmentation |
38 | | * with some (brain-damaged) malloc libraries. |
39 | | */ |
40 | 0 | for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) { |
41 | 0 | (*cinfo->mem->free_pool) (cinfo, pool); |
42 | 0 | } |
43 | | |
44 | | /* Reset overall state for possible reuse of object */ |
45 | 0 | if (cinfo->is_decompressor) { |
46 | 0 | cinfo->global_state = DSTATE_START; |
47 | | /* Try to keep application from accessing now-deleted marker list. |
48 | | * A bit kludgy to do it here, but this is the most central place. |
49 | | */ |
50 | 0 | ((j_decompress_ptr) cinfo)->marker_list = NULL; |
51 | 0 | } else { |
52 | 0 | cinfo->global_state = CSTATE_START; |
53 | 0 | } |
54 | 0 | } |
55 | | |
56 | | |
57 | | /* |
58 | | * Destruction of a JPEG object. |
59 | | * |
60 | | * Everything gets deallocated except the master jpeg_compress_struct itself |
61 | | * and the error manager struct. Both of these are supplied by the application |
62 | | * and must be freed, if necessary, by the application. (Often they are on |
63 | | * the stack and so don't need to be freed anyway.) |
64 | | * Closing a data source or destination, if necessary, is the application's |
65 | | * responsibility. |
66 | | */ |
67 | | |
68 | | GLOBAL(void) |
69 | | jpeg_destroy (j_common_ptr cinfo) |
70 | 0 | { |
71 | | /* We need only tell the memory manager to release everything. */ |
72 | | /* NB: mem pointer is NULL if memory mgr failed to initialize. */ |
73 | 0 | if (cinfo->mem != NULL) |
74 | 0 | (*cinfo->mem->self_destruct) (cinfo); |
75 | 0 | cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */ |
76 | 0 | cinfo->global_state = 0; /* mark it destroyed */ |
77 | 0 | } |
78 | | |
79 | | |
80 | | /* |
81 | | * Convenience routines for allocating quantization and Huffman tables. |
82 | | * (Would jutils.c be a more reasonable place to put these?) |
83 | | */ |
84 | | |
85 | | GLOBAL(JQUANT_TBL *) |
86 | | jpeg_alloc_quant_table (j_common_ptr cinfo) |
87 | 0 | { |
88 | 0 | JQUANT_TBL *tbl; |
89 | |
|
90 | 0 | tbl = (JQUANT_TBL *) |
91 | 0 | (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL)); |
92 | 0 | tbl->sent_table = FALSE; /* make sure this is false in any new table */ |
93 | 0 | return tbl; |
94 | 0 | } |
95 | | |
96 | | |
97 | | GLOBAL(JHUFF_TBL *) |
98 | | jpeg_alloc_huff_table (j_common_ptr cinfo) |
99 | 0 | { |
100 | 0 | JHUFF_TBL *tbl; |
101 | |
|
102 | 0 | tbl = (JHUFF_TBL *) |
103 | 0 | (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL)); |
104 | 0 | tbl->sent_table = FALSE; /* make sure this is false in any new table */ |
105 | 0 | return tbl; |
106 | 0 | } |