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
29GLOBAL(void)
30jpeg_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
69GLOBAL(void)
70jpeg_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
86GLOBAL(JQUANT_TBL *)
87jpeg_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
98GLOBAL(JHUFF_TBL *)
99jpeg_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