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