1 | //notify.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2012 |
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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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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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44 | void (*cb)(struct roar_notify_core * core, struct roar_event * event, void * userdata); |
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45 | void * userdata; |
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46 | size_t refc; |
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47 | unsigned int hash; |
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48 | // struct roar_subscriber * prev; |
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49 | struct roar_subscriber * next; |
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50 | }; |
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51 | |
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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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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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58 | }; |
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59 | |
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60 | static struct roar_notify_core * _libroar_notify_core = NULL; |
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61 | |
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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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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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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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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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99 | roar_err_set(ROAR_ERROR_INVAL); |
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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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113 | core->proxy = NULL; |
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114 | core->proxy_userdata = NULL; |
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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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121 | memset(core->lists, 0, lists*sizeof(struct roar_subscriber *)); |
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122 | |
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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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143 | roar_panic(ROAR_FATAL_ERROR_MEMORY_CORRUPTION, NULL); |
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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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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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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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173 | int roar_notify_core_new_global(ssize_t lists) { |
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174 | if ( _libroar_notify_core != NULL ) { |
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175 | roar_err_set(ROAR_ERROR_INVAL); |
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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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185 | struct roar_notify_core * roar_notify_core_swap_global(struct roar_notify_core * core) { |
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186 | struct roar_notify_core * ret = _libroar_notify_core; |
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187 | |
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188 | if ( core != NULL ) |
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189 | if ( roar_notify_core_ref(core) == -1 ) |
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190 | return NULL; |
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191 | |
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192 | _libroar_notify_core = core; |
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193 | |
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194 | return ret; |
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195 | } |
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196 | |
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197 | 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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198 | _CKICORE(); |
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199 | |
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200 | core->proxy = cb; |
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201 | core->proxy_userdata = userdata; |
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202 | |
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203 | return 0; |
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204 | } |
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205 | |
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206 | |
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207 | 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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208 | struct roar_subscriber * subs = NULL; |
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209 | struct roar_subscriber * cur, * old; |
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210 | |
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211 | ROAR_DBG("roar_notify_core_subscribe(core=%p, event=%p, cb=%p, userdata=%p) = ?", core, event, cb, userdata); |
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212 | |
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213 | _CKRCORE(NULL); |
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214 | |
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215 | if ( event == NULL || cb == NULL ) { |
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216 | 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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217 | roar_err_set(ROAR_ERROR_FAULT); |
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218 | return NULL; |
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219 | } |
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220 | |
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221 | if ( (subs = roar_mm_malloc(sizeof(struct roar_subscriber))) == NULL ) { |
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222 | 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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223 | return NULL; |
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224 | } |
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225 | |
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226 | memset(subs, 0, sizeof(struct roar_subscriber)); |
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227 | |
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228 | subs->flags = 0; |
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229 | subs->event = event->event; |
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230 | subs->emitter = event->emitter; |
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231 | subs->target = event->target; |
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232 | subs->target_type = event->target_type; |
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233 | subs->cb = cb; |
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234 | subs->userdata = userdata; |
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235 | subs->refc = 1; |
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236 | subs->hash = _hash_event(core, event); |
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237 | subs->next = NULL; |
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238 | |
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239 | if ( (cur = core->lists[subs->hash]) == NULL ) { |
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240 | core->lists[subs->hash] = subs; |
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241 | } else { |
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242 | old = cur; |
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243 | while (cur != NULL) { |
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244 | old = cur; |
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245 | cur = cur->next; |
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246 | } |
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247 | |
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248 | old->next = subs; |
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249 | } |
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250 | |
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251 | ROAR_DBG("roar_notify_core_subscribe(core=%p, event=%p, cb=%p, userdata=%p) = %p", core, event, cb, userdata, subs); |
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252 | return subs; |
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253 | } |
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254 | |
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255 | int roar_notify_core_unsubscribe(struct roar_notify_core * core, struct roar_subscriber * subscriber) { |
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256 | struct roar_subscriber * cur, * old; |
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257 | |
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258 | _CKICORE(); |
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259 | |
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260 | if ( subscriber == NULL ) { |
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261 | roar_err_set(ROAR_ERROR_FAULT); |
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262 | return -1; |
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263 | } |
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264 | |
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265 | if ( (cur = core->lists[subscriber->hash]) == subscriber ) { |
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266 | core->lists[subscriber->hash] = core->lists[subscriber->hash]->next; |
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267 | } else { |
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268 | old = NULL; |
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269 | while (cur != NULL && cur != subscriber ) { |
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270 | old = cur; |
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271 | cur = cur->next; |
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272 | } |
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273 | |
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274 | if ( cur != subscriber ) |
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275 | return -1; |
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276 | |
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277 | old->next = cur->next; |
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278 | roar_mm_free(cur); |
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279 | } |
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280 | |
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281 | return 0; |
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282 | } |
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283 | |
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284 | int roar_notify_core_emit(struct roar_notify_core * core, struct roar_event * event) { |
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285 | struct roar_subscriber * cur; |
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286 | struct roar_error_state errstate; |
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287 | |
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288 | _CKICORE(); |
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289 | |
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290 | if ( event == NULL ) { |
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291 | roar_err_set(ROAR_ERROR_FAULT); |
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292 | return -1; |
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293 | } |
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294 | |
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295 | if ( core->proxy != NULL && !(event->flags & ROAR_EVENT_FLAG_PROXYEVENT) ) { |
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296 | core->proxy(core, event, core->proxy_userdata); |
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297 | } |
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298 | |
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299 | cur = core->lists[_hash_event(core, event)]; |
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300 | ROAR_DBG("roar_notify_core_emit(core=%p, event=%p): cur=%p", core, event, cur); |
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301 | |
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302 | while (cur != NULL) { |
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303 | ROAR_DBG("roar_notify_core_emit(core=%p, event=%p): cur=%p", core, event, cur); |
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304 | |
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305 | // test if we can skip this one: |
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306 | if ( !( (cur->event == ROAR_NOTIFY_SPECIAL || cur->event == event->event) && |
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307 | (cur->emitter == -1 || cur->emitter == event->emitter) && |
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308 | (cur->target == -1 || cur->target == event->target) && |
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309 | (cur->target_type == -1 || cur->target_type == event->target_type) |
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310 | ) ) { |
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311 | cur = cur->next; |
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312 | continue; |
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313 | } |
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314 | |
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315 | if ( cur->cb == NULL ) { |
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316 | ROAR_ERR("roar_notify_core_emit(core=%p, event=%p): cur=%p, cb is set NULL, bad.", core, event, cur); |
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317 | } else { |
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318 | // The callback is started in an clear error context which is destroyed after it finished so it |
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319 | // does not alter our caller's context. |
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320 | roar_err_store(&errstate); |
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321 | roar_err_clear_all(); |
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322 | |
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323 | cur->cb(core, event, cur->userdata); |
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324 | |
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325 | roar_err_restore(&errstate); |
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326 | } |
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327 | cur = cur->next; |
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328 | } |
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329 | |
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330 | return 0; |
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331 | } |
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332 | |
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333 | 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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334 | struct roar_event locevent; |
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335 | |
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336 | memset(&locevent, 0, sizeof(locevent)); |
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337 | |
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338 | locevent.event = event; |
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339 | locevent.emitter = emitter; |
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340 | locevent.target = target; |
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341 | locevent.target_type = target_type; |
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342 | locevent.arg0 = arg0; |
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343 | locevent.arg1 = arg1; |
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344 | locevent.arg2 = arg2; |
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345 | locevent.arg2_len = arg2_len; |
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346 | |
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347 | if ( arg2 == NULL && (arg2_len == 0 || arg2_len == -1) ) { |
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348 | locevent.flags |= ROAR_EVENT_FLAG_NETTRANS; // we guess packages with only int args are network transparent. |
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349 | } |
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350 | |
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351 | return roar_notify_core_emit(NULL, &locevent); |
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352 | } |
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353 | |
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354 | |
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355 | int roar_event_to_blob(struct roar_event * event, void * blob, size_t * len) { |
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356 | size_t needed_len = (2 * 4) + (4 * 2); |
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357 | uint32_t * u32 = blob; |
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358 | uint16_t * u16 = blob; |
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359 | size_t data_offset_neg = 0; |
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360 | |
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361 | u16 += 4; |
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362 | |
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363 | // error checking: |
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364 | if ( event == NULL || blob == NULL || len == NULL ) |
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365 | return -1; |
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366 | |
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367 | if ( *len == 0 ) |
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368 | return -1; |
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369 | |
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370 | // calc and check length: |
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371 | if ( event->flags & ROAR_EVENT_FLAG_PROXYEVENT ) |
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372 | needed_len += 4; |
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373 | |
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374 | if ( event->flags & ROAR_EVENT_FLAG_NETTRANS ) { |
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375 | |
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376 | // this is not a real maximum but a value good to detect all kinds of errors. |
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377 | // a notify event should not be longer anyway. |
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378 | if ( event->arg2_len > 32767 ) |
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379 | return -1; |
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380 | |
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381 | needed_len += 4; |
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382 | if ( event->arg2_len > 0 ) { |
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383 | needed_len += event->arg2_len; |
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384 | data_offset_neg = event->arg2_len; |
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385 | } |
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386 | } |
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387 | |
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388 | if ( *len < needed_len ) |
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389 | return -1; |
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390 | |
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391 | *len = 0; |
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392 | |
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393 | // fill in the data... |
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394 | memset(blob, 0, needed_len); |
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395 | |
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396 | u32[1] = ROAR_HOST2NET32(0); |
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397 | |
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398 | if ( event->flags & ROAR_EVENT_FLAG_PROXYEVENT ) { |
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399 | u32[0] |= ROAR_HOST2NET32(ROAR_EVENT_NETFLAG_PROXYEVENT); |
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400 | u16 += 2; |
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401 | } |
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402 | |
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403 | if ( event->flags & ROAR_EVENT_FLAG_NETTRANS ) { |
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404 | u32[0] |= ROAR_HOST2NET32(ROAR_EVENT_NETFLAG_DATA); |
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405 | } |
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406 | |
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407 | u32[1] = ROAR_HOST2NET32(event->event); |
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408 | |
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409 | if ( event->flags & ROAR_EVENT_FLAG_PROXYEVENT ) |
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410 | u32[2] = ROAR_HOST2NET32(event->event_proxy); |
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411 | |
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412 | u16[0] = ROAR_HOST2NET16(event->emitter); |
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413 | u16[1] = ROAR_HOST2NET16(event->target); |
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414 | u16[2] = ROAR_HOST2NET16(event->target_type); |
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415 | if ( event->flags & ROAR_EVENT_FLAG_NETTRANS ) { |
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416 | u16[3] = ROAR_HOST2NET16(event->arg2_len); |
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417 | u16[4] = ROAR_HOST2NET16(event->arg0); |
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418 | u16[5] = ROAR_HOST2NET16(event->arg1); |
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419 | } else { |
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420 | u16[3] = ROAR_HOST2NET16(0); |
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421 | } |
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422 | |
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423 | memcpy(blob + needed_len - data_offset_neg, event->arg2, event->arg2_len); |
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424 | |
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425 | *len = needed_len; |
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426 | |
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427 | return 0; |
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428 | } |
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429 | |
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430 | int roar_event_from_blob(struct roar_event * event, void * blob, size_t * len) { |
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431 | size_t needed_len = (2 * 4) + (4 * 2); |
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432 | uint32_t * u32 = blob; |
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433 | uint16_t * u16 = blob; |
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434 | uint32_t flags; |
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435 | |
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436 | u16 += 4; |
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437 | |
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438 | // error checking: |
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439 | if ( event == NULL || blob == NULL || len == NULL ) |
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440 | return -1; |
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441 | |
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442 | // check for minimum length. |
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443 | if ( *len < needed_len ) |
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444 | return -1; |
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445 | |
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446 | flags = ROAR_NET2HOST32(u32[0]); |
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447 | |
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448 | #if 0 |
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449 | if ( event->flags & ROAR_EVENT_FLAG_PROXYEVENT ) { |
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450 | u32[0] |= ROAR_HOST2NET32(ROAR_EVENT_NETFLAG_PROXYEVENT); |
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451 | u16 += 2; |
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452 | } |
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453 | |
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454 | if ( event->flags & ROAR_EVENT_FLAG_NETTRANS ) { |
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455 | u32[0] |= ROAR_HOST2NET32(ROAR_EVENT_NETFLAG_DATA); |
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456 | } |
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457 | #endif |
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458 | |
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459 | if ( flags & ROAR_EVENT_NETFLAG_PROXYEVENT ) { |
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460 | needed_len += 4; |
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461 | u16 += 2; |
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462 | } |
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463 | |
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464 | if ( flags & ROAR_EVENT_NETFLAG_DATA ) { |
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465 | needed_len += 4; |
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466 | } |
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467 | |
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468 | // do we have a full header? |
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469 | if ( *len < needed_len ) |
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470 | return -1; |
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471 | |
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472 | needed_len += ROAR_NET2HOST16(u16[3]); |
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473 | |
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474 | // is all of the event complet? |
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475 | if ( *len < needed_len ) |
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476 | return -1; |
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477 | |
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478 | // now we know everything is complet we can start to extract data... |
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479 | |
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480 | *len = 0; |
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481 | |
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482 | memset(event, 0, sizeof(struct roar_event)); |
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483 | |
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484 | if ( flags & ROAR_EVENT_NETFLAG_PROXYEVENT ) { |
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485 | flags -= ROAR_EVENT_NETFLAG_PROXYEVENT; |
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486 | event->flags |= ROAR_EVENT_FLAG_PROXYEVENT; |
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487 | } |
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488 | |
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489 | if ( flags & ROAR_EVENT_NETFLAG_DATA ) { |
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490 | flags -= ROAR_EVENT_NETFLAG_DATA; |
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491 | event->flags |= ROAR_EVENT_FLAG_NETTRANS; |
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492 | } |
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493 | |
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494 | // test if there are flags left we do not understand: |
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495 | if ( flags ) { |
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496 | return -1; |
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497 | } |
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498 | |
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499 | event->event = ROAR_NET2HOST32(u32[1]); |
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500 | |
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501 | if ( event->flags & ROAR_EVENT_FLAG_PROXYEVENT ) |
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502 | event->event_proxy = ROAR_NET2HOST32(u32[2]); |
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503 | |
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504 | event->emitter = ROAR_NET2HOST16(u16[0]); |
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505 | event->target = ROAR_NET2HOST16(u16[1]); |
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506 | event->target_type = ROAR_NET2HOST16(u16[2]); |
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507 | event->arg2_len = ROAR_NET2HOST16(u16[3]); |
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508 | |
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509 | if ( event->emitter == (uint16_t)-1) |
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510 | event->emitter = -1; |
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511 | |
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512 | if ( event->target == (uint16_t)-1) |
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513 | event->target = -1; |
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514 | |
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515 | if ( event->target_type == (uint16_t)-1) |
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516 | event->target_type = -1; |
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517 | |
---|
518 | if ( event->flags & ROAR_EVENT_FLAG_NETTRANS ) { |
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519 | event->arg0 = ROAR_NET2HOST16(u16[4]); |
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520 | event->arg1 = ROAR_NET2HOST16(u16[5]); |
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521 | |
---|
522 | if ( event->arg0 == (uint16_t)-1) |
---|
523 | event->arg0 = -1; |
---|
524 | |
---|
525 | if ( event->arg1 == (uint16_t)-1) |
---|
526 | event->arg1 = -1; |
---|
527 | |
---|
528 | event->arg2 = blob + needed_len - event->arg2_len; |
---|
529 | } else { |
---|
530 | event->arg0 = -1; |
---|
531 | event->arg1 = -1; |
---|
532 | event->arg2 = NULL; |
---|
533 | } |
---|
534 | |
---|
535 | *len = needed_len; |
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536 | |
---|
537 | return 0; |
---|
538 | } |
---|
539 | |
---|
540 | |
---|
541 | //ll |
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