/src/libjpeg-turbo.main/jcomapi.c

Source (jump to first uncovered line)
/*
 * jcomapi.c
 *
 * This file was part of the Independent JPEG Group's software:
 * Copyright (C) 1994-1997, Thomas G. Lane.
 * It was modified by The libjpeg-turbo Project to include only code relevant
 * to libjpeg-turbo.
 * For conditions of distribution and use, see the accompanying README.ijg
 * 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;
}

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		* It was modified by The libjpeg-turbo Project to include only code relevant
7		* to libjpeg-turbo.
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	29.0k	{
34	29.0k	int pool;
35
36		/* Do nothing if called on a not-initialized or destroyed JPEG object. */
37	29.0k	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	58.1k	for (pool = JPOOL_NUMPOOLS - 1; pool > JPOOL_PERMANENT; pool--) {
44	29.0k	(*cinfo->mem->free_pool) (cinfo, pool);
45	29.0k	}
46
47		/* Reset overall state for possible reuse of object */
48	29.0k	if (cinfo->is_decompressor) {
49	29.0k	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	29.0k	((j_decompress_ptr)cinfo)->marker_list = NULL;
54	29.0k	} else {
55	0	cinfo->global_state = CSTATE_START;
56	0	}
57	29.0k	}
58
59
60		/*
61		* Destruction of a JPEG object.
62		*
63		* Everything gets deallocated except the master jpeg_compress_struct itself
64		* and the error manager struct. Both of these are supplied by the application
65		* and must be freed, if necessary, by the application. (Often they are on
66		* the stack and so don't need to be freed anyway.)
67		* Closing a data source or destination, if necessary, is the application's
68		* responsibility.
69		*/
70
71		GLOBAL(void)
72		jpeg_destroy(j_common_ptr cinfo)
73	8.97k	{
74		/* We need only tell the memory manager to release everything. */
75		/* NB: mem pointer is NULL if memory mgr failed to initialize. */
76	8.97k	if (cinfo->mem != NULL)
77	8.97k	(*cinfo->mem->self_destruct) (cinfo);
78	8.97k	cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */
79	8.97k	cinfo->global_state = 0; /* mark it destroyed */
80	8.97k	}
81
82
83		/*
84		* Convenience routines for allocating quantization and Huffman tables.
85		* (Would jutils.c be a more reasonable place to put these?)
86		*/
87
88		GLOBAL(JQUANT_TBL *)
89		jpeg_alloc_quant_table(j_common_ptr cinfo)
90	11.2k	{
91	11.2k	JQUANT_TBL *tbl;
92
93	11.2k	tbl = (JQUANT_TBL *)
94	11.2k	(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, sizeof(JQUANT_TBL));
95	11.2k	tbl->sent_table = FALSE; /* make sure this is false in any new table */
96	11.2k	return tbl;
97	11.2k	}
98
99
100		GLOBAL(JHUFF_TBL *)
101		jpeg_alloc_huff_table(j_common_ptr cinfo)
102	19.5k	{
103	19.5k	JHUFF_TBL *tbl;
104
105	19.5k	tbl = (JHUFF_TBL *)
106	19.5k	(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, sizeof(JHUFF_TBL));
107	19.5k	tbl->sent_table = FALSE; /* make sure this is false in any new table */
108	19.5k	return tbl;
109	19.5k	}

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Created: 2024-08-17 06:42