/src/gdal/build/frmts/jpeg/libjpeg12/jcomapi12.c

Source
/*
 * 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;
}

Line	Count	Source
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	176k	{
31	176k	int pool;
32
33		/* Do nothing if called on a not-initialized or destroyed JPEG object. */
34	176k	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	353k	for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
41	176k	(*cinfo->mem->free_pool) (cinfo, pool);
42	176k	}
43
44		/* Reset overall state for possible reuse of object */
45	176k	if (cinfo->is_decompressor) {
46	27.8k	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	27.8k	((j_decompress_ptr) cinfo)->marker_list = NULL;
51	148k	} else {
52	148k	cinfo->global_state = CSTATE_START;
53	148k	}
54	176k	}
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	154k	{
71		/* We need only tell the memory manager to release everything. */
72		/* NB: mem pointer is NULL if memory mgr failed to initialize. */
73	154k	if (cinfo->mem != NULL)
74	154k	(*cinfo->mem->self_destruct) (cinfo);
75	154k	cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */
76	154k	cinfo->global_state = 0; /* mark it destroyed */
77	154k	}
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	301k	{
88	301k	JQUANT_TBL *tbl;
89
90	301k	tbl = (JQUANT_TBL *)
91	301k	(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
92	301k	tbl->sent_table = FALSE; /* make sure this is false in any new table */
93	301k	return tbl;
94	301k	}
95
96
97		GLOBAL(JHUFF_TBL *)
98		jpeg_alloc_huff_table (j_common_ptr cinfo)
99	599k	{
100	599k	JHUFF_TBL *tbl;
101
102	599k	tbl = (JHUFF_TBL *)
103	599k	(*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
104	599k	tbl->sent_table = FALSE; /* make sure this is false in any new table */
105	599k	return tbl;
106	599k	}

Coverage Report

Created: 2026-08-11 08:26