3rdparty/libjpeg/jcomapi.c

/*
 * jcomapi.c
 *
 * Copyright (C) 1994-1997, Thomas G. Lane.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains application interface routines that are used for both
 * compression and decompression.
 */

#define JPEG_INTERNALS
#include "jinclude.h"
#include "jpeglib.h"


/*
 * Abort processing of a JPEG compression or decompression operation,
 * but don't destroy the object itself.
 *
 * For this, we merely clean up all the nonpermanent memory pools.
 * Note that temp files (virtual arrays) are not allowed to belong to
 * the permanent pool, so we will be able to close all temp files here.
 * Closing a data source or destination, if necessary, is the application's
 * responsibility.
 */

GLOBAL(void)
jpeg_abort (j_common_ptr cinfo)
{
  int pool;

  /* Do nothing if called on a not-initialized or destroyed JPEG object. */
  if (cinfo->mem == NULL)
    return;

  /* Releasing pools in reverse order might help avoid fragmentation
   * with some (brain-damaged) malloc libraries.
   */
  for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
    (*cinfo->mem->free_pool) (cinfo, pool);
  }

  /* Reset overall state for possible reuse of object */
  if (cinfo->is_decompressor) {
    cinfo->global_state = DSTATE_START;
    /* Try to keep application from accessing now-deleted marker list.
     * A bit kludgy to do it here, but this is the most central place.
     */
    ((j_decompress_ptr) cinfo)->marker_list = NULL;
  } else {
    cinfo->global_state = CSTATE_START;
  }
}


/*
 * Destruction of a JPEG object.
 *
 * Everything gets deallocated except the master jpeg_compress_struct itself
 * and the error manager struct.  Both of these are supplied by the application
 * and must be freed, if necessary, by the application.  (Often they are on
 * the stack and so don't need to be freed anyway.)
 * Closing a data source or destination, if necessary, is the application's
 * responsibility.
 */

GLOBAL(void)
jpeg_destroy (j_common_ptr cinfo)
{
  /* We need only tell the memory manager to release everything. */
  /* NB: mem pointer is NULL if memory mgr failed to initialize. */
  if (cinfo->mem != NULL)
    (*cinfo->mem->self_destruct) (cinfo);
  cinfo->mem = NULL;            /* be safe if jpeg_destroy is called twice */
  cinfo->global_state = 0;      /* mark it destroyed */
}


/*
 * Convenience routines for allocating quantization and Huffman tables.
 * (Would jutils.c be a more reasonable place to put these?)
 */

GLOBAL(JQUANT_TBL *)
jpeg_alloc_quant_table (j_common_ptr cinfo)
{
  JQUANT_TBL *tbl;

  tbl = (JQUANT_TBL *)
    (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
  tbl->sent_table = FALSE;      /* make sure this is false in any new table */
  return tbl;
}


GLOBAL(JHUFF_TBL *)
jpeg_alloc_huff_table (j_common_ptr cinfo)
{
  JHUFF_TBL *tbl;

  tbl = (JHUFF_TBL *)
    (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
  tbl->sent_table = FALSE;      /* make sure this is false in any new table */
  return tbl;
}
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	{
31	int pool;
32
33	/* Do nothing if called on a not-initialized or destroyed JPEG object. */
34	if (cinfo->mem == NULL)
35	return;
36
37	/* Releasing pools in reverse order might help avoid fragmentation
38	* with some (brain-damaged) malloc libraries.
39	*/
40	for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
41	(*cinfo->mem->free_pool) (cinfo, pool);
42	}
43
44	/* Reset overall state for possible reuse of object */
45	if (cinfo->is_decompressor) {
46	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	((j_decompress_ptr) cinfo)->marker_list = NULL;
51	} else {
52	cinfo->global_state = CSTATE_START;
53	}
54	}
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	{
71	/* We need only tell the memory manager to release everything. */
72	/* NB: mem pointer is NULL if memory mgr failed to initialize. */
73	if (cinfo->mem != NULL)
74	(*cinfo->mem->self_destruct) (cinfo);
75	cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */
76	cinfo->global_state = 0; /* mark it destroyed */
77	}
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	{
88	JQUANT_TBL *tbl;
89
90	tbl = (JQUANT_TBL *)
91	(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
92	tbl->sent_table = FALSE; /* make sure this is false in any new table */
93	return tbl;
94	}
95
96
97	GLOBAL(JHUFF_TBL *)
98	jpeg_alloc_huff_table (j_common_ptr cinfo)
99	{
100	JHUFF_TBL *tbl;
101
102	tbl = (JHUFF_TBL *)
103	(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
104	tbl->sent_table = FALSE; /* make sure this is false in any new table */
105	return tbl;
106	}