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| 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 } |
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