media/libjpeg/jcomapi.c@b8a032363ba2 (annotated)
media/libjpeg/jcomapi.c
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* |
| michael@0 | 2 | * jcomapi.c |
| michael@0 | 3 | * |
| michael@0 | 4 | * Copyright (C) 1994-1997, Thomas G. Lane. |
| michael@0 | 5 | * This file is part of the Independent JPEG Group's software. |
| michael@0 | 6 | * For conditions of distribution and use, see the accompanying README file. |
| michael@0 | 7 | * |
| michael@0 | 8 | * This file contains application interface routines that are used for both |
| michael@0 | 9 | * compression and decompression. |
| michael@0 | 10 | */ |
| michael@0 | 11 | |
| michael@0 | 12 | #define JPEG_INTERNALS |
| michael@0 | 13 | #include "jinclude.h" |
| michael@0 | 14 | #include "jpeglib.h" |
| michael@0 | 15 | |
| michael@0 | 16 | |
| michael@0 | 17 | /* |
| michael@0 | 18 | * Abort processing of a JPEG compression or decompression operation, |
| michael@0 | 19 | * but don't destroy the object itself. |
| michael@0 | 20 | * |
| michael@0 | 21 | * For this, we merely clean up all the nonpermanent memory pools. |
| michael@0 | 22 | * Note that temp files (virtual arrays) are not allowed to belong to |
| michael@0 | 23 | * the permanent pool, so we will be able to close all temp files here. |
| michael@0 | 24 | * Closing a data source or destination, if necessary, is the application's |
| michael@0 | 25 | * responsibility. |
| michael@0 | 26 | */ |
| michael@0 | 27 | |
| michael@0 | 28 | GLOBAL(void) |
| michael@0 | 29 | jpeg_abort (j_common_ptr cinfo) |
| michael@0 | 30 | { |
| michael@0 | 31 | int pool; |
| michael@0 | 32 | |
| michael@0 | 33 | /* Do nothing if called on a not-initialized or destroyed JPEG object. */ |
| michael@0 | 34 | if (cinfo->mem == NULL) |
| michael@0 | 35 | return; |
| michael@0 | 36 | |
| michael@0 | 37 | /* Releasing pools in reverse order might help avoid fragmentation |
| michael@0 | 38 | * with some (brain-damaged) malloc libraries. |
| michael@0 | 39 | */ |
| michael@0 | 40 | for (pool = JPOOL_NUMPOOLS-1; pool > JPOOL_PERMANENT; pool--) { |
| michael@0 | 41 | (*cinfo->mem->free_pool) (cinfo, pool); |
| michael@0 | 42 | } |
| michael@0 | 43 | |
| michael@0 | 44 | /* Reset overall state for possible reuse of object */ |
| michael@0 | 45 | if (cinfo->is_decompressor) { |
| michael@0 | 46 | cinfo->global_state = DSTATE_START; |
| michael@0 | 47 | /* Try to keep application from accessing now-deleted marker list. |
| michael@0 | 48 | * A bit kludgy to do it here, but this is the most central place. |
| michael@0 | 49 | */ |
| michael@0 | 50 | ((j_decompress_ptr) cinfo)->marker_list = NULL; |
| michael@0 | 51 | } else { |
| michael@0 | 52 | cinfo->global_state = CSTATE_START; |
| michael@0 | 53 | } |
| michael@0 | 54 | } |
| michael@0 | 55 | |
| michael@0 | 56 | |
| michael@0 | 57 | /* |
| michael@0 | 58 | * Destruction of a JPEG object. |
| michael@0 | 59 | * |
| michael@0 | 60 | * Everything gets deallocated except the master jpeg_compress_struct itself |
| michael@0 | 61 | * and the error manager struct. Both of these are supplied by the application |
| michael@0 | 62 | * and must be freed, if necessary, by the application. (Often they are on |
| michael@0 | 63 | * the stack and so don't need to be freed anyway.) |
| michael@0 | 64 | * Closing a data source or destination, if necessary, is the application's |
| michael@0 | 65 | * responsibility. |
| michael@0 | 66 | */ |
| michael@0 | 67 | |
| michael@0 | 68 | GLOBAL(void) |
| michael@0 | 69 | jpeg_destroy (j_common_ptr cinfo) |
| michael@0 | 70 | { |
| michael@0 | 71 | /* We need only tell the memory manager to release everything. */ |
| michael@0 | 72 | /* NB: mem pointer is NULL if memory mgr failed to initialize. */ |
| michael@0 | 73 | if (cinfo->mem != NULL) |
| michael@0 | 74 | (*cinfo->mem->self_destruct) (cinfo); |
| michael@0 | 75 | cinfo->mem = NULL; /* be safe if jpeg_destroy is called twice */ |
| michael@0 | 76 | cinfo->global_state = 0; /* mark it destroyed */ |
| michael@0 | 77 | } |
| michael@0 | 78 | |
| michael@0 | 79 | |
| michael@0 | 80 | /* |
| michael@0 | 81 | * Convenience routines for allocating quantization and Huffman tables. |
| michael@0 | 82 | * (Would jutils.c be a more reasonable place to put these?) |
| michael@0 | 83 | */ |
| michael@0 | 84 | |
| michael@0 | 85 | GLOBAL(JQUANT_TBL *) |
| michael@0 | 86 | jpeg_alloc_quant_table (j_common_ptr cinfo) |
| michael@0 | 87 | { |
| michael@0 | 88 | JQUANT_TBL *tbl; |
| michael@0 | 89 | |
| michael@0 | 90 | tbl = (JQUANT_TBL *) |
| michael@0 | 91 | (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JQUANT_TBL)); |
| michael@0 | 92 | tbl->sent_table = FALSE; /* make sure this is false in any new table */ |
| michael@0 | 93 | return tbl; |
| michael@0 | 94 | } |
| michael@0 | 95 | |
| michael@0 | 96 | |
| michael@0 | 97 | GLOBAL(JHUFF_TBL *) |
| michael@0 | 98 | jpeg_alloc_huff_table (j_common_ptr cinfo) |
| michael@0 | 99 | { |
| michael@0 | 100 | JHUFF_TBL *tbl; |
| michael@0 | 101 | |
| michael@0 | 102 | tbl = (JHUFF_TBL *) |
| michael@0 | 103 | (*cinfo->mem->alloc_small) (cinfo, JPOOL_PERMANENT, SIZEOF(JHUFF_TBL)); |
| michael@0 | 104 | tbl->sent_table = FALSE; /* make sure this is false in any new table */ |
| michael@0 | 105 | return tbl; |
| michael@0 | 106 | } |
