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