[4302] | 1 | //notify.c: |
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| 2 | |
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| 3 | /* |
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[4708] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2011 |
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[4302] | 5 | * |
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| 6 | * This file is part of libroar a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroar is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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| 23 | * |
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| 24 | * NOTE for everyone want's to change something and send patches: |
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| 25 | * read README and HACKING! There a addition information on |
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| 26 | * the license of this document you need to read before you send |
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| 27 | * any patches. |
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| 28 | * |
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| 29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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| 30 | * or libpulse*: |
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| 31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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| 32 | * and are therefore GPL. Because of this it may be illigal to use |
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| 33 | * them with any software that uses libesd, libartsc or libpulse*. |
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| 34 | */ |
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| 35 | |
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| 36 | #include "libroar.h" |
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| 37 | |
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[4304] | 38 | struct roar_subscriber { |
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| 39 | uint32_t flags; |
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| 40 | uint32_t event; |
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| 41 | int emitter; |
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| 42 | int target; |
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| 43 | int target_type; |
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[4306] | 44 | void (*cb)(struct roar_notify_core * core, struct roar_event * event, void * userdata); |
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[4304] | 45 | void * userdata; |
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| 46 | size_t refc; |
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[4305] | 47 | unsigned int hash; |
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| 48 | // struct roar_subscriber * prev; |
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[4304] | 49 | struct roar_subscriber * next; |
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| 50 | }; |
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| 51 | |
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[4305] | 52 | struct roar_notify_core { |
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| 53 | size_t refc; |
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| 54 | size_t listc; |
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| 55 | struct roar_subscriber ** lists; |
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[4313] | 56 | void (*proxy)(struct roar_notify_core * core, struct roar_event * event, void * userdata); |
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| 57 | void * proxy_userdata; |
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[4305] | 58 | }; |
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| 59 | |
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[4320] | 60 | static struct roar_notify_core * _libroar_notify_core = NULL; |
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| 61 | |
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[4873] | 62 | #define _CKRCORE(ret) if ( core == NULL ) { if ( _libroar_notify_core == NULL ) { roar_err_set(ROAR_ERROR_INVAL); return (ret); } else { core = _libroar_notify_core; } } |
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[4305] | 63 | #define _CKICORE() _CKRCORE(-1) |
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| 64 | |
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| 65 | static unsigned int _hash_event (struct roar_notify_core * core, struct roar_event * event) { |
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| 66 | unsigned int hash = 0; |
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| 67 | unsigned int mask = core->listc - 1; |
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| 68 | |
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| 69 | hash ^= event->event >> 0; |
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| 70 | hash ^= event->event >> 8; |
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| 71 | hash ^= event->event >> 16; |
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| 72 | hash ^= event->event >> 24; |
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| 73 | |
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| 74 | return hash & mask; |
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| 75 | } |
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| 76 | |
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| 77 | struct roar_notify_core * roar_notify_core_new(ssize_t lists) { |
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| 78 | struct roar_notify_core * core = NULL; |
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| 79 | |
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| 80 | switch (lists) { |
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[4310] | 81 | case 1: |
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| 82 | case 2: |
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| 83 | case 4: |
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| 84 | case 8: |
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| 85 | case 16: |
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| 86 | case 32: |
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| 87 | case 64: |
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| 88 | case 128: |
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| 89 | case 256: |
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| 90 | case 512: |
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| 91 | case 1024: |
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[4305] | 92 | // they all are ok. |
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| 93 | break; |
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| 94 | case -1: |
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| 95 | // handle defult: |
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| 96 | lists = 16; |
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| 97 | break; |
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| 98 | default: |
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[4873] | 99 | roar_err_set(ROAR_ERROR_INVAL); |
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[4305] | 100 | return NULL; |
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| 101 | break; |
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| 102 | } |
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| 103 | |
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| 104 | if ( (core = roar_mm_malloc(sizeof(struct roar_notify_core))) == NULL ) { |
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| 105 | return NULL; |
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| 106 | } |
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| 107 | |
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| 108 | memset(core, 0, sizeof(struct roar_notify_core)); |
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| 109 | |
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| 110 | core->refc = 1; |
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| 111 | core->listc = lists; |
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| 112 | core->lists = roar_mm_malloc(lists*sizeof(struct roar_subscriber *)); |
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[4313] | 113 | core->proxy = NULL; |
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| 114 | core->proxy_userdata = NULL; |
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[4305] | 115 | |
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| 116 | if ( core->lists == NULL ) { |
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| 117 | roar_mm_free(core); |
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| 118 | return NULL; |
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| 119 | } |
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| 120 | |
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[4308] | 121 | memset(core->lists, 0, lists*sizeof(struct roar_subscriber *)); |
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| 122 | |
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[4305] | 123 | return core; |
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| 124 | } |
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| 125 | |
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| 126 | int roar_notify_core_ref(struct roar_notify_core * core) { |
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| 127 | _CKICORE(); |
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| 128 | |
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| 129 | core->refc++; |
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| 130 | |
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| 131 | return 0; |
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| 132 | } |
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| 133 | |
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| 134 | int roar_notify_core_unref(struct roar_notify_core * core) { |
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| 135 | struct roar_subscriber * cur, * next; |
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| 136 | size_t i; |
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| 137 | |
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| 138 | _CKICORE(); |
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| 139 | |
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| 140 | if ( core->refc == 0 ) { |
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| 141 | ROAR_ERR("roar_notify_core_unref(core=%p): refc is zero, must be greater zero. resolving by setting to one.", core); |
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| 142 | core->refc = 1; |
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[4973] | 143 | roar_panic(ROAR_FATAL_ERROR_MEMORY_CORRUPTION, NULL); |
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[4305] | 144 | } |
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| 145 | |
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| 146 | core->refc--; |
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| 147 | |
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| 148 | if ( core->refc > 0 ) { |
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| 149 | return 0; |
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| 150 | } |
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| 151 | |
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[4322] | 152 | // if we work on the global core, reset it to NULL if we free it. |
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| 153 | if ( core == _libroar_notify_core ) { |
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| 154 | _libroar_notify_core = NULL; |
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| 155 | } |
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| 156 | |
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[4305] | 157 | for (i = 0; i < core->listc; i++) { |
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| 158 | cur = core->lists[i]; |
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| 159 | while (cur != NULL) { |
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| 160 | next = cur->next; |
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| 161 | |
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| 162 | roar_mm_free(cur); |
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| 163 | |
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| 164 | cur = next; |
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| 165 | } |
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| 166 | } |
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| 167 | |
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| 168 | roar_mm_free(core->lists); |
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| 169 | roar_mm_free(core); |
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| 170 | return 0; |
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| 171 | } |
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| 172 | |
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[4320] | 173 | int roar_notify_core_new_global(ssize_t lists) { |
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| 174 | if ( _libroar_notify_core != NULL ) { |
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[4873] | 175 | roar_err_set(ROAR_ERROR_INVAL); |
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[4320] | 176 | return -1; |
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| 177 | } |
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| 178 | |
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| 179 | if ( (_libroar_notify_core = roar_notify_core_new(lists)) == NULL ) |
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| 180 | return -1; |
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| 181 | |
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| 182 | return 0; |
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| 183 | } |
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| 184 | |
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[4313] | 185 | int roar_notify_core_register_proxy(struct roar_notify_core * core, void (*cb)(struct roar_notify_core * core, struct roar_event * event, void * userdata), void * userdata) { |
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| 186 | _CKICORE(); |
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| 187 | |
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| 188 | core->proxy = cb; |
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| 189 | core->proxy_userdata = userdata; |
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| 190 | |
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| 191 | return 0; |
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| 192 | } |
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| 193 | |
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| 194 | |
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[4306] | 195 | struct roar_subscriber * roar_notify_core_subscribe(struct roar_notify_core * core, struct roar_event * event, void (*cb)(struct roar_notify_core * core, struct roar_event * event, void * userdata), void * userdata) { |
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[4305] | 196 | struct roar_subscriber * subs = NULL; |
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| 197 | struct roar_subscriber * cur, * old; |
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| 198 | |
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[4309] | 199 | ROAR_DBG("roar_notify_core_subscribe(core=%p, event=%p, cb=%p, userdata=%p) = ?", core, event, cb, userdata); |
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| 200 | |
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[4305] | 201 | _CKRCORE(NULL); |
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| 202 | |
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| 203 | if ( event == NULL || cb == NULL ) { |
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[4309] | 204 | ROAR_DBG("roar_notify_core_subscribe(core=%p, event=%p, cb=%p, userdata=%p) = NULL // errno = EINVAL", core, event, cb, userdata); |
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[4873] | 205 | roar_err_set(ROAR_ERROR_FAULT); |
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[4305] | 206 | return NULL; |
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| 207 | } |
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| 208 | |
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| 209 | if ( (subs = roar_mm_malloc(sizeof(struct roar_subscriber))) == NULL ) { |
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[4309] | 210 | ROAR_DBG("roar_notify_core_subscribe(core=%p, event=%p, cb=%p, userdata=%p) = NULL // errno = ENOMEM?", core, event, cb, userdata); |
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[4305] | 211 | return NULL; |
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| 212 | } |
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| 213 | |
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| 214 | memset(subs, 0, sizeof(struct roar_subscriber)); |
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| 215 | |
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| 216 | subs->flags = 0; |
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| 217 | subs->event = event->event; |
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| 218 | subs->emitter = event->emitter; |
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| 219 | subs->target = event->target; |
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| 220 | subs->target_type = event->target_type; |
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| 221 | subs->cb = cb; |
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| 222 | subs->userdata = userdata; |
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| 223 | subs->refc = 1; |
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| 224 | subs->hash = _hash_event(core, event); |
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| 225 | subs->next = NULL; |
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| 226 | |
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| 227 | if ( (cur = core->lists[subs->hash]) == NULL ) { |
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| 228 | core->lists[subs->hash] = subs; |
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| 229 | } else { |
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| 230 | old = cur; |
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| 231 | while (cur != NULL) { |
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| 232 | old = cur; |
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| 233 | cur = cur->next; |
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| 234 | } |
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| 235 | |
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| 236 | old->next = subs; |
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| 237 | } |
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| 238 | |
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[4309] | 239 | ROAR_DBG("roar_notify_core_subscribe(core=%p, event=%p, cb=%p, userdata=%p) = %p", core, event, cb, userdata, subs); |
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[4305] | 240 | return subs; |
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| 241 | } |
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| 242 | |
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| 243 | int roar_notify_core_unsubscribe(struct roar_notify_core * core, struct roar_subscriber * subscriber) { |
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| 244 | struct roar_subscriber * cur, * old; |
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| 245 | |
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| 246 | _CKICORE(); |
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| 247 | |
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[4309] | 248 | if ( subscriber == NULL ) { |
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[4873] | 249 | roar_err_set(ROAR_ERROR_FAULT); |
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[4305] | 250 | return -1; |
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| 251 | } |
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| 252 | |
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| 253 | if ( (cur = core->lists[subscriber->hash]) == subscriber ) { |
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| 254 | core->lists[subscriber->hash] = core->lists[subscriber->hash]->next; |
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| 255 | } else { |
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| 256 | old = NULL; |
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| 257 | while (cur != NULL && cur != subscriber ) { |
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| 258 | old = cur; |
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| 259 | cur = cur->next; |
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| 260 | } |
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| 261 | |
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| 262 | if ( cur != subscriber ) |
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| 263 | return -1; |
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| 264 | |
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| 265 | old->next = cur->next; |
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| 266 | roar_mm_free(cur); |
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| 267 | } |
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| 268 | |
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| 269 | return 0; |
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| 270 | } |
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| 271 | |
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| 272 | int roar_notify_core_emit(struct roar_notify_core * core, struct roar_event * event) { |
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| 273 | struct roar_subscriber * cur; |
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[5151] | 274 | struct roar_error_state errstate; |
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[4305] | 275 | |
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| 276 | _CKICORE(); |
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| 277 | |
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[4309] | 278 | if ( event == NULL ) { |
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[4873] | 279 | roar_err_set(ROAR_ERROR_FAULT); |
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[4305] | 280 | return -1; |
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| 281 | } |
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| 282 | |
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[4316] | 283 | if ( core->proxy != NULL && !(event->flags & ROAR_EVENT_FLAG_PROXYEVENT) ) { |
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[4313] | 284 | core->proxy(core, event, core->proxy_userdata); |
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| 285 | } |
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| 286 | |
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[4305] | 287 | cur = core->lists[_hash_event(core, event)]; |
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[4309] | 288 | ROAR_DBG("roar_notify_core_emit(core=%p, event=%p): cur=%p", core, event, cur); |
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[4305] | 289 | |
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| 290 | while (cur != NULL) { |
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[4309] | 291 | ROAR_DBG("roar_notify_core_emit(core=%p, event=%p): cur=%p", core, event, cur); |
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| 292 | |
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| 293 | // test if we can skip this one: |
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| 294 | if ( !( (cur->event == ROAR_NOTIFY_SPECIAL || cur->event == event->event) && |
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| 295 | (cur->emitter == -1 || cur->emitter == event->emitter) && |
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| 296 | (cur->target == -1 || cur->target == event->target) && |
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| 297 | (cur->target_type == -1 || cur->target_type == event->target_type) |
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| 298 | ) ) { |
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| 299 | cur = cur->next; |
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| 300 | continue; |
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| 301 | } |
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| 302 | |
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[4305] | 303 | if ( cur->cb == NULL ) { |
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| 304 | ROAR_ERR("roar_notify_core_emit(core=%p, event=%p): cur=%p, cb is set NULL, bad.", core, event, cur); |
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| 305 | } else { |
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[5151] | 306 | // The callback is started in an clear error context which is destroyed after it finished so it |
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| 307 | // does not alter our caller's context. |
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| 308 | roar_err_store(&errstate); |
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| 309 | roar_err_clear_all(); |
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| 310 | |
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[4306] | 311 | cur->cb(core, event, cur->userdata); |
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[5151] | 312 | |
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| 313 | roar_err_restore(&errstate); |
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[4305] | 314 | } |
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| 315 | cur = cur->next; |
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| 316 | } |
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| 317 | |
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| 318 | return 0; |
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| 319 | } |
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| 320 | |
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[4321] | 321 | int roar_notify_core_emit_simple(uint32_t event, int emitter, int target, int target_type, int arg0, int arg1, void * arg2, ssize_t arg2_len) { |
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| 322 | struct roar_event locevent; |
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| 323 | |
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| 324 | memset(&locevent, 0, sizeof(locevent)); |
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| 325 | |
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| 326 | locevent.event = event; |
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| 327 | locevent.emitter = emitter; |
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| 328 | locevent.target = target; |
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| 329 | locevent.target_type = target_type; |
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| 330 | locevent.arg0 = arg0; |
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| 331 | locevent.arg1 = arg1; |
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| 332 | locevent.arg2 = arg2; |
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| 333 | locevent.arg2_len = arg2_len; |
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| 334 | |
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[4337] | 335 | if ( arg2 == NULL && (arg2_len == 0 || arg2_len == -1) ) { |
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| 336 | locevent.flags |= ROAR_EVENT_FLAG_NETTRANS; // we guss packages with only int args are network transparent. |
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| 337 | } |
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| 338 | |
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[4321] | 339 | return roar_notify_core_emit(NULL, &locevent); |
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| 340 | } |
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| 341 | |
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[4339] | 342 | |
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| 343 | int roar_event_to_blob(struct roar_event * event, void * blob, size_t * len) { |
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| 344 | size_t needed_len = (2 * 4) + (4 * 2); |
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| 345 | uint32_t * u32 = blob; |
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| 346 | uint16_t * u16 = blob; |
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| 347 | size_t data_offset_neg = 0; |
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| 348 | |
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| 349 | u16 += 4; |
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| 350 | |
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| 351 | // error checking: |
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| 352 | if ( event == NULL || blob == NULL || len == NULL ) |
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| 353 | return -1; |
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| 354 | |
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| 355 | if ( *len == 0 ) |
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| 356 | return -1; |
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| 357 | |
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| 358 | // calc and check length: |
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| 359 | if ( event->flags & ROAR_EVENT_FLAG_PROXYEVENT ) |
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| 360 | needed_len += 4; |
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| 361 | |
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| 362 | if ( event->flags & ROAR_EVENT_FLAG_NETTRANS ) { |
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| 363 | |
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| 364 | // this is not a real maximum but a value good to detect all kinds of errors. |
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| 365 | // a notify event should not be longer anyway. |
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[5019] | 366 | if ( event->arg2_len > 32767 ) |
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[4339] | 367 | return -1; |
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| 368 | |
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| 369 | needed_len += 4; |
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| 370 | if ( event->arg2_len > 0 ) { |
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| 371 | needed_len += event->arg2_len; |
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| 372 | data_offset_neg = event->arg2_len; |
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| 373 | } |
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| 374 | } |
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| 375 | |
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| 376 | if ( *len < needed_len ) |
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| 377 | return -1; |
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| 378 | |
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| 379 | *len = 0; |
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| 380 | |
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| 381 | // fill in the data... |
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| 382 | memset(blob, 0, needed_len); |
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| 383 | |
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| 384 | u32[1] = ROAR_HOST2NET32(0); |
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| 385 | |
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| 386 | if ( event->flags & ROAR_EVENT_FLAG_PROXYEVENT ) { |
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| 387 | u32[0] |= ROAR_HOST2NET32(ROAR_EVENT_NETFLAG_PROXYEVENT); |
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| 388 | u16 += 2; |
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| 389 | } |
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| 390 | |
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| 391 | if ( event->flags & ROAR_EVENT_FLAG_NETTRANS ) { |
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| 392 | u32[0] |= ROAR_HOST2NET32(ROAR_EVENT_NETFLAG_DATA); |
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| 393 | } |
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| 394 | |
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| 395 | u32[1] = ROAR_HOST2NET32(event->event); |
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| 396 | |
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| 397 | if ( event->flags & ROAR_EVENT_FLAG_PROXYEVENT ) |
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| 398 | u32[2] = ROAR_HOST2NET32(event->event_proxy); |
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| 399 | |
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| 400 | u16[0] = ROAR_HOST2NET16(event->emitter); |
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| 401 | u16[1] = ROAR_HOST2NET16(event->target); |
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| 402 | u16[2] = ROAR_HOST2NET16(event->target_type); |
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| 403 | if ( event->flags & ROAR_EVENT_FLAG_NETTRANS ) { |
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| 404 | u16[3] = ROAR_HOST2NET16(event->arg2_len); |
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| 405 | u16[4] = ROAR_HOST2NET16(event->arg0); |
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| 406 | u16[5] = ROAR_HOST2NET16(event->arg1); |
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| 407 | } else { |
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| 408 | u16[3] = ROAR_HOST2NET16(0); |
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| 409 | } |
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| 410 | |
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| 411 | memcpy(blob + needed_len - data_offset_neg, event->arg2, event->arg2_len); |
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| 412 | |
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| 413 | *len = needed_len; |
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| 414 | |
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| 415 | return 0; |
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| 416 | } |
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| 417 | |
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| 418 | int roar_event_from_blob(struct roar_event * event, void * blob, size_t * len) { |
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| 419 | size_t needed_len = (2 * 4) + (4 * 2); |
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| 420 | uint32_t * u32 = blob; |
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| 421 | uint16_t * u16 = blob; |
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| 422 | uint32_t flags; |
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| 423 | |
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| 424 | u16 += 4; |
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| 425 | |
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| 426 | // error checking: |
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| 427 | if ( event == NULL || blob == NULL || len == NULL ) |
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| 428 | return -1; |
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| 429 | |
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| 430 | // check for minimum length. |
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| 431 | if ( *len < needed_len ) |
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| 432 | return -1; |
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| 433 | |
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| 434 | flags = ROAR_NET2HOST32(u32[0]); |
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| 435 | |
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| 436 | #if 0 |
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| 437 | if ( event->flags & ROAR_EVENT_FLAG_PROXYEVENT ) { |
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| 438 | u32[0] |= ROAR_HOST2NET32(ROAR_EVENT_NETFLAG_PROXYEVENT); |
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| 439 | u16 += 2; |
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| 440 | } |
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| 441 | |
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| 442 | if ( event->flags & ROAR_EVENT_FLAG_NETTRANS ) { |
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| 443 | u32[0] |= ROAR_HOST2NET32(ROAR_EVENT_NETFLAG_DATA); |
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| 444 | } |
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| 445 | #endif |
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| 446 | |
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| 447 | if ( flags & ROAR_EVENT_NETFLAG_PROXYEVENT ) { |
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| 448 | needed_len += 4; |
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| 449 | u16 += 2; |
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| 450 | } |
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| 451 | |
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| 452 | if ( flags & ROAR_EVENT_NETFLAG_DATA ) { |
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| 453 | needed_len += 4; |
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| 454 | } |
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| 455 | |
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| 456 | // do we have a full header? |
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| 457 | if ( *len < needed_len ) |
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| 458 | return -1; |
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| 459 | |
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| 460 | needed_len += ROAR_NET2HOST16(u16[3]); |
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| 461 | |
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| 462 | // is all of the event complet? |
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| 463 | if ( *len < needed_len ) |
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| 464 | return -1; |
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| 465 | |
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| 466 | // now we know everything is complet we can start to extract data... |
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| 467 | |
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| 468 | *len = 0; |
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| 469 | |
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| 470 | memset(event, 0, sizeof(struct roar_event)); |
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| 471 | |
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| 472 | if ( flags & ROAR_EVENT_NETFLAG_PROXYEVENT ) { |
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| 473 | flags -= ROAR_EVENT_NETFLAG_PROXYEVENT; |
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| 474 | event->flags |= ROAR_EVENT_FLAG_PROXYEVENT; |
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| 475 | } |
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| 476 | |
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| 477 | if ( flags & ROAR_EVENT_NETFLAG_DATA ) { |
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| 478 | flags -= ROAR_EVENT_NETFLAG_DATA; |
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| 479 | event->flags |= ROAR_EVENT_FLAG_NETTRANS; |
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| 480 | } |
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| 481 | |
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| 482 | // test if there are flags left we do not understand: |
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| 483 | if ( flags ) { |
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| 484 | return -1; |
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| 485 | } |
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| 486 | |
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| 487 | event->event = ROAR_NET2HOST32(u32[1]); |
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| 488 | |
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| 489 | if ( event->flags & ROAR_EVENT_FLAG_PROXYEVENT ) |
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| 490 | event->event_proxy = ROAR_NET2HOST32(u32[2]); |
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| 491 | |
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| 492 | event->emitter = ROAR_NET2HOST16(u16[0]); |
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| 493 | event->target = ROAR_NET2HOST16(u16[1]); |
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| 494 | event->target_type = ROAR_NET2HOST16(u16[2]); |
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| 495 | event->arg2_len = ROAR_NET2HOST16(u16[3]); |
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| 496 | |
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[4342] | 497 | if ( event->emitter == (uint16_t)-1) |
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| 498 | event->emitter = -1; |
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| 499 | |
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| 500 | if ( event->target == (uint16_t)-1) |
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| 501 | event->target = -1; |
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| 502 | |
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| 503 | if ( event->target_type == (uint16_t)-1) |
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| 504 | event->target_type = -1; |
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| 505 | |
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[4339] | 506 | if ( event->flags & ROAR_EVENT_FLAG_NETTRANS ) { |
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| 507 | event->arg0 = ROAR_NET2HOST16(u16[4]); |
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[4342] | 508 | event->arg1 = ROAR_NET2HOST16(u16[5]); |
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| 509 | |
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| 510 | if ( event->arg0 == (uint16_t)-1) |
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| 511 | event->arg0 = -1; |
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| 512 | |
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| 513 | if ( event->arg1 == (uint16_t)-1) |
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| 514 | event->arg1 = -1; |
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| 515 | |
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[4339] | 516 | event->arg2 = blob + needed_len - event->arg2_len; |
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| 517 | } else { |
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| 518 | event->arg0 = -1; |
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| 519 | event->arg1 = -1; |
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| 520 | event->arg2 = NULL; |
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| 521 | } |
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| 522 | |
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| 523 | *len = needed_len; |
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| 524 | |
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| 525 | return 0; |
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| 526 | } |
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| 527 | |
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| 528 | |
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[4302] | 529 | //ll |
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