vrshoot

annotate libs/libjpeg/jcomapi.c @ 0:b2f14e535253

find changesets by author, revision, files, or words in the commit message
initial commit
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 01 Feb 2014 19:58:19 +0200
parents
children
rev   line source
nuclear@0 1 /*
nuclear@0 2 * jcomapi.c
nuclear@0 3 *
nuclear@0 4 * Copyright (C) 1994-1997, Thomas G. Lane.
nuclear@0 5 * This file is part of the Independent JPEG Group's software.
nuclear@0 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@0 7 *
nuclear@0 8 * This file contains application interface routines that are used for both
nuclear@0 9 * compression and decompression.
nuclear@0 10 */
nuclear@0 11
nuclear@0 12 #define JPEG_INTERNALS
nuclear@0 13 #include "jinclude.h"
nuclear@0 14 #include "jpeglib.h"
nuclear@0 15
nuclear@0 16
nuclear@0 17 /*
nuclear@0 18 * Abort processing of a JPEG compression or decompression operation,
nuclear@0 19 * but don't destroy the object itself.
nuclear@0 20 *
nuclear@0 21 * For this, we merely clean up all the nonpermanent memory pools.
nuclear@0 22 * Note that temp files (virtual arrays) are not allowed to belong to
nuclear@0 23 * the permanent pool, so we will be able to close all temp files here.
nuclear@0 24 * Closing a data source or destination, if necessary, is the application's
nuclear@0 25 * responsibility.
nuclear@0 26 */
nuclear@0 27
nuclear@0 28 GLOBAL(void)
nuclear@0 29 jpeg_abort (j_common_ptr cinfo)
nuclear@0 30 {
nuclear@0 31 int pool;
nuclear@0 32
nuclear@0 33 /* Do nothing if called on a not-initialized or destroyed JPEG object. */
nuclear@0 34 if (cinfo->mem == NULL)
nuclear@0 35 return;
nuclear@0 36
nuclear@0 37 /* Releasing pools in reverse order might help avoid fragmentation
nuclear@0 38 * with some (brain-damaged) malloc libraries.
nuclear@0 39 */
nuclear@0 40 for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) {
nuclear@0 41 (*cinfo->mem->free_pool) (cinfo, pool);
nuclear@0 42 }
nuclear@0 43
nuclear@0 44 /* Reset overall state for possible reuse of object */
nuclear@0 45 if (cinfo->is_decompressor) {
nuclear@0 46 cinfo->global_state = DSTATE_START;
nuclear@0 47 /* Try to keep application from accessing now-deleted marker list.
nuclear@0 48 * A bit kludgy to do it here, but this is the most central place.
nuclear@0 49 */
nuclear@0 50 ((j_decompress_ptr) cinfo)->marker_list = NULL;
nuclear@0 51 } else {
nuclear@0 52 cinfo->global_state = CSTATE_START;
nuclear@0 53 }
nuclear@0 54 }
nuclear@0 55
nuclear@0 56
nuclear@0 57 /*
nuclear@0 58 * Destruction of a JPEG object.
nuclear@0 59 *
nuclear@0 60 * Everything gets deallocated except the master jpeg_compress_struct itself
nuclear@0 61 * and the error manager struct. Both of these are supplied by the application
nuclear@0 62 * and must be freed, if necessary, by the application. (Often they are on
nuclear@0 63 * the stack and so don't need to be freed anyway.)
nuclear@0 64 * Closing a data source or destination, if necessary, is the application's
nuclear@0 65 * responsibility.
nuclear@0 66 */
nuclear@0 67
nuclear@0 68 GLOBAL(void)
nuclear@0 69 jpeg_destroy (j_common_ptr cinfo)
nuclear@0 70 {
nuclear@0 71 /* We need only tell the memory manager to release everything. */
nuclear@0 72 /* NB: mem pointer is NULL if memory mgr failed to initialize. */
nuclear@0 73 if (cinfo->mem != NULL)
nuclear@0 74 (*cinfo->mem->self_destruct) (cinfo);
nuclear@0 75 cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */
nuclear@0 76 cinfo->global_state = 0; /* mark it destroyed */
nuclear@0 77 }
nuclear@0 78
nuclear@0 79
nuclear@0 80 /*
nuclear@0 81 * Convenience routines for allocating quantization and Huffman tables.
nuclear@0 82 * (Would jutils.c be a more reasonable place to put these?)
nuclear@0 83 */
nuclear@0 84
nuclear@0 85 GLOBAL(JQUANT_TBL *)
nuclear@0 86 jpeg_alloc_quant_table (j_common_ptr cinfo)
nuclear@0 87 {
nuclear@0 88 JQUANT_TBL *tbl;
nuclear@0 89
nuclear@0 90 tbl = (JQUANT_TBL *)
nuclear@0 91 (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL));
nuclear@0 92 tbl->sent_table = FALSE; /* make sure this is false in any new table */
nuclear@0 93 return tbl;
nuclear@0 94 }
nuclear@0 95
nuclear@0 96
nuclear@0 97 GLOBAL(JHUFF_TBL *)
nuclear@0 98 jpeg_alloc_huff_table (j_common_ptr cinfo)
nuclear@0 99 {
nuclear@0 100 JHUFF_TBL *tbl;
nuclear@0 101
nuclear@0 102 tbl = (JHUFF_TBL *)
nuclear@0 103 (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL));
nuclear@0 104 tbl->sent_table = FALSE; /* make sure this is false in any new table */
nuclear@0 105 return tbl;
nuclear@0 106 }