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| 1 /* | |
| 2 ****************************************************************************** | |
| 3 * | |
| 4 * Copyright (C) 2009-2010, International Business Machines | |
| 5 * Corporation and others. All Rights Reserved. | |
| 6 * | |
| 7 ****************************************************************************** | |
| 8 * | |
| 9 * FILE NAME : icuplug.h | |
| 10 * | |
| 11 * Date Name Description | |
| 12 * 10/29/2009 sl New. | |
| 13 ****************************************************************************** | |
| 14 */ | |
| 15 | |
| 16 /** | |
| 17 * \file | |
| 18 * \brief C API: ICU Plugin API | |
| 19 * | |
| 20 * <h2>C API: ICU Plugin API</h2> | |
| 21 * | |
| 22 * <p>C API allowing run-time loadable modules that extend or modify ICU functio
nality.</p> | |
| 23 * | |
| 24 * <h3>Loading and Configuration</h3> | |
| 25 * | |
| 26 * <p>At ICU startup time, the environment variable "ICU_PLUGINS" will be | |
| 27 * queried for a directory name. If it is not set, the preprocessor symbol | |
| 28 * "DEFAULT_ICU_PLUGINS" will be checked for a default value.</p> | |
| 29 * | |
| 30 * <p>Within the above-named directory, the file "icuplugins##.txt" will be | |
| 31 * opened, if present, where ## is the major+minor number of the currently | |
| 32 * running ICU (such as, 44 for ICU 4.4, thus icuplugins44.txt)</p> | |
| 33 * | |
| 34 * <p>The configuration file has this format:</p> | |
| 35 * | |
| 36 * <ul> | |
| 37 * <li>Hash (#) begins a comment line</li> | |
| 38 * | |
| 39 * <li>Non-comment lines have two or three components: | |
| 40 * LIBRARYNAME ENTRYPOINT [ CONFIGURATION .. ]</li> | |
| 41 * | |
| 42 * <li>Tabs or spaces separate the three items.</li> | |
| 43 * | |
| 44 * <li>LIBRARYNAME is the name of a shared library, either a short name if | |
| 45 * it is on the loader path, or a full pathname.</li> | |
| 46 * | |
| 47 * <li>ENTRYPOINT is the short (undecorated) symbol name of the plugin's | |
| 48 * entrypoint, as above.</li> | |
| 49 * | |
| 50 * <li>CONFIGURATION is the entire rest of the line . It's passed as-is to | |
| 51 * the plugin.</li> | |
| 52 * </ul> | |
| 53 * | |
| 54 * <p>An example configuration file is, in its entirety:</p> | |
| 55 * | |
| 56 * \code | |
| 57 * # this is icuplugins44.txt | |
| 58 * testplug.dll myPlugin hello=world | |
| 59 * \endcode | |
| 60 * <p>Plugins are categorized as "high" or "low" level. Low level are those | |
| 61 * which must be run BEFORE high level plugins, and before any operations | |
| 62 * which cause ICU to be 'initialized'. If a plugin is low level but | |
| 63 * causes ICU to allocate memory or become initialized, that plugin is said | |
| 64 * to cause a 'level change'. </p> | |
| 65 * | |
| 66 * <p>At load time, ICU first queries all plugins to determine their level, | |
| 67 * then loads all 'low' plugins first, and then loads all 'high' plugins. | |
| 68 * Plugins are otherwise loaded in the order listed in the configuration file.</
p> | |
| 69 * | |
| 70 * <h3>Implementing a Plugin</h3> | |
| 71 * \code | |
| 72 * U_CAPI UPlugTokenReturn U_EXPORT2 | |
| 73 * myPlugin (UPlugData *plug, UPlugReason reason, UErrorCode *status) { | |
| 74 * if(reason==UPLUG_REASON_QUERY) { | |
| 75 * uplug_setPlugName(plug, "Simple Plugin"); | |
| 76 * uplug_setPlugLevel(plug, UPLUG_LEVEL_HIGH); | |
| 77 * } else if(reason==UPLUG_REASON_LOAD) { | |
| 78 * ... Set up some ICU things here.... | |
| 79 * } else if(reason==UPLUG_REASON_UNLOAD) { | |
| 80 * ... unload, clean up ... | |
| 81 * } | |
| 82 * return UPLUG_TOKEN; | |
| 83 * } | |
| 84 * \endcode | |
| 85 * | |
| 86 * <p>The UPlugData* is an opaque pointer to the plugin-specific data, and is | |
| 87 * used in all other API calls.</p> | |
| 88 * | |
| 89 * <p>The API contract is:</p> | |
| 90 * <ol><li>The plugin MUST always return UPLUG_TOKEN as a return value- to | |
| 91 * indicate that it is a valid plugin.</li> | |
| 92 * | |
| 93 * <li>When the 'reason' parameter is set to UPLUG_REASON_QUERY, the | |
| 94 * plugin MUST call uplug_setPlugLevel() to indicate whether it is a high | |
| 95 * level or low level plugin.</li> | |
| 96 * | |
| 97 * <li>When the 'reason' parameter is UPLUG_REASON_QUERY, the plugin | |
| 98 * SHOULD call uplug_setPlugName to indicate a human readable plugin name.</li><
/ol> | |
| 99 * | |
| 100 * | |
| 101 * \internal ICU 4.4 Technology Preview | |
| 102 */ | |
| 103 | |
| 104 | |
| 105 #ifndef ICUPLUG_H | |
| 106 #define ICUPLUG_H | |
| 107 | |
| 108 #include "unicode/utypes.h" | |
| 109 | |
| 110 | |
| 111 /* === Basic types === */ | |
| 112 | |
| 113 /** | |
| 114 * @{ | |
| 115 * Opaque structure passed to/from a plugin. | |
| 116 * use the APIs to access it. | |
| 117 * @internal ICU 4.4 Technology Preview | |
| 118 */ | |
| 119 | |
| 120 struct UPlugData; | |
| 121 typedef struct UPlugData UPlugData; | |
| 122 | |
| 123 /** @} */ | |
| 124 | |
| 125 /** | |
| 126 * Random Token to identify a valid ICU plugin. Plugins must return this | |
| 127 * from the entrypoint. | |
| 128 * @internal ICU 4.4 Technology Preview | |
| 129 */ | |
| 130 #define UPLUG_TOKEN 0x54762486 | |
| 131 | |
| 132 /** | |
| 133 * Max width of names, symbols, and configuration strings | |
| 134 * @internal ICU 4.4 Technology Preview | |
| 135 */ | |
| 136 #define UPLUG_NAME_MAX 100 | |
| 137 | |
| 138 | |
| 139 /** | |
| 140 * Return value from a plugin entrypoint. | |
| 141 * Must always be set to UPLUG_TOKEN | |
| 142 * @see UPLUG_TOKEN | |
| 143 * @internal ICU 4.4 Technology Preview | |
| 144 */ | |
| 145 typedef uint32_t UPlugTokenReturn; | |
| 146 | |
| 147 /** | |
| 148 * Reason code for the entrypoint's call | |
| 149 * @internal ICU 4.4 Technology Preview | |
| 150 */ | |
| 151 typedef enum { | |
| 152 UPLUG_REASON_QUERY = 0, /**< The plugin is being queried for info. **/ | |
| 153 UPLUG_REASON_LOAD = 1, /**< The plugin is being loaded. **/ | |
| 154 UPLUG_REASON_UNLOAD = 2, /**< The plugin is being unloaded. **/ | |
| 155 UPLUG_REASON_COUNT /**< count of known reasons **/ | |
| 156 } UPlugReason; | |
| 157 | |
| 158 | |
| 159 /** | |
| 160 * Level of plugin loading | |
| 161 * INITIAL: UNKNOWN | |
| 162 * QUERY: INVALID -> { LOW | HIGH } | |
| 163 * ERR -> INVALID | |
| 164 * @internal ICU 4.4 Technology Preview | |
| 165 */ | |
| 166 typedef enum { | |
| 167 UPLUG_LEVEL_INVALID = 0, /**< The plugin is invalid, hasn't called uplug
_setLevel, or can't load. **/ | |
| 168 UPLUG_LEVEL_UNKNOWN = 1, /**< The plugin is waiting to be installed. **/ | |
| 169 UPLUG_LEVEL_LOW = 2, /**< The plugin must be called before u_init co
mpletes **/ | |
| 170 UPLUG_LEVEL_HIGH = 3, /**< The plugin can run at any time. **/ | |
| 171 UPLUG_LEVEL_COUNT /**< count of known reasons **/ | |
| 172 } UPlugLevel; | |
| 173 | |
| 174 /** | |
| 175 * Entrypoint for an ICU plugin. | |
| 176 * @param plug the UPlugData handle. | |
| 177 * @param status the plugin's extended status code. | |
| 178 * @return A valid plugin must return UPLUG_TOKEN | |
| 179 * @internal ICU 4.4 Technology Preview | |
| 180 */ | |
| 181 typedef UPlugTokenReturn (U_EXPORT2 UPlugEntrypoint) ( | |
| 182 UPlugData *plug, | |
| 183 UPlugReason reason, | |
| 184 UErrorCode *status); | |
| 185 | |
| 186 /* === Needed for Implementing === */ | |
| 187 | |
| 188 /** | |
| 189 * Request that this plugin not be unloaded at cleanup time. | |
| 190 * This is appropriate for plugins which cannot be cleaned up. | |
| 191 * @see u_cleanup() | |
| 192 * @param plug plugin | |
| 193 * @param dontUnload set true if this plugin can't be unloaded | |
| 194 * @internal ICU 4.4 Technology Preview | |
| 195 */ | |
| 196 U_CAPI void U_EXPORT2 | |
| 197 uplug_setPlugNoUnload(UPlugData *plug, UBool dontUnload); | |
| 198 | |
| 199 /** | |
| 200 * Set the level of this plugin. | |
| 201 * @param plug plugin data handle | |
| 202 * @param level the level of this plugin | |
| 203 * @internal ICU 4.4 Technology Preview | |
| 204 */ | |
| 205 U_CAPI void U_EXPORT2 | |
| 206 uplug_setPlugLevel(UPlugData *plug, UPlugLevel level); | |
| 207 | |
| 208 /** | |
| 209 * Get the level of this plugin. | |
| 210 * @param plug plugin data handle | |
| 211 * @return the level of this plugin | |
| 212 * @internal ICU 4.4 Technology Preview | |
| 213 */ | |
| 214 U_CAPI UPlugLevel U_EXPORT2 | |
| 215 uplug_getPlugLevel(UPlugData *plug); | |
| 216 | |
| 217 /** | |
| 218 * Get the lowest level of plug which can currently load. | |
| 219 * For example, if UPLUG_LEVEL_LOW is returned, then low level plugins may load | |
| 220 * if UPLUG_LEVEL_HIGH is returned, then only high level plugins may load. | |
| 221 * @return the lowest level of plug which can currently load | |
| 222 * @internal ICU 4.4 Technology Preview | |
| 223 */ | |
| 224 U_CAPI UPlugLevel U_EXPORT2 | |
| 225 uplug_getCurrentLevel(void); | |
| 226 | |
| 227 | |
| 228 /** | |
| 229 * Get plug load status | |
| 230 * @return The error code of this plugin's load attempt. | |
| 231 * @internal ICU 4.4 Technology Preview | |
| 232 */ | |
| 233 U_CAPI UErrorCode U_EXPORT2 | |
| 234 uplug_getPlugLoadStatus(UPlugData *plug); | |
| 235 | |
| 236 /** | |
| 237 * Set the human-readable name of this plugin. | |
| 238 * @param plug plugin data handle | |
| 239 * @param name the name of this plugin. The first UPLUG_NAME_MAX characters will
i be copied into a new buffer. | |
| 240 * @internal ICU 4.4 Technology Preview | |
| 241 */ | |
| 242 U_CAPI void U_EXPORT2 | |
| 243 uplug_setPlugName(UPlugData *plug, const char *name); | |
| 244 | |
| 245 /** | |
| 246 * Get the human-readable name of this plugin. | |
| 247 * @param plug plugin data handle | |
| 248 * @return the name of this plugin | |
| 249 * @internal ICU 4.4 Technology Preview | |
| 250 */ | |
| 251 U_CAPI const char * U_EXPORT2 | |
| 252 uplug_getPlugName(UPlugData *plug); | |
| 253 | |
| 254 /** | |
| 255 * Return the symbol name for this plugin, if known. | |
| 256 * @param plug plugin data handle | |
| 257 * @return the symbol name, or NULL | |
| 258 * @internal ICU 4.4 Technology Preview | |
| 259 */ | |
| 260 U_CAPI const char * U_EXPORT2 | |
| 261 uplug_getSymbolName(UPlugData *plug); | |
| 262 | |
| 263 /** | |
| 264 * Return the library name for this plugin, if known. | |
| 265 * @param plug plugin data handle | |
| 266 * @param status error code | |
| 267 * @return the library name, or NULL | |
| 268 * @internal ICU 4.4 Technology Preview | |
| 269 */ | |
| 270 U_CAPI const char * U_EXPORT2 | |
| 271 uplug_getLibraryName(UPlugData *plug, UErrorCode *status); | |
| 272 | |
| 273 /** | |
| 274 * Return the library used for this plugin, if known. | |
| 275 * Plugins could use this to load data out of their | |
| 276 * @param plug plugin data handle | |
| 277 * @return the library, or NULL | |
| 278 * @internal ICU 4.4 Technology Preview | |
| 279 */ | |
| 280 U_CAPI void * U_EXPORT2 | |
| 281 uplug_getLibrary(UPlugData *plug); | |
| 282 | |
| 283 /** | |
| 284 * Return the plugin-specific context data. | |
| 285 * @param plug plugin data handle | |
| 286 * @return the context, or NULL if not set | |
| 287 * @internal ICU 4.4 Technology Preview | |
| 288 */ | |
| 289 U_CAPI void * U_EXPORT2 | |
| 290 uplug_getContext(UPlugData *plug); | |
| 291 | |
| 292 /** | |
| 293 * Set the plugin-specific context data. | |
| 294 * @param plug plugin data handle | |
| 295 * @param context new context to set | |
| 296 * @internal ICU 4.4 Technology Preview | |
| 297 */ | |
| 298 U_CAPI void U_EXPORT2 | |
| 299 uplug_setContext(UPlugData *plug, void *context); | |
| 300 | |
| 301 | |
| 302 /** | |
| 303 * Get the configuration string, if available. | |
| 304 * The string is in the platform default codepage. | |
| 305 * @param plug plugin data handle | |
| 306 * @return configuration string, or else null. | |
| 307 * @internal ICU 4.4 Technology Preview | |
| 308 */ | |
| 309 U_CAPI const char * U_EXPORT2 | |
| 310 uplug_getConfiguration(UPlugData *plug); | |
| 311 | |
| 312 /** | |
| 313 * Return all currently installed plugins, from newest to oldest | |
| 314 * Usage Example: | |
| 315 * \code | |
| 316 * UPlugData *plug = NULL; | |
| 317 * while(plug=uplug_nextPlug(plug)) { | |
| 318 * ... do something with 'plug' ... | |
| 319 * } | |
| 320 * \endcode | |
| 321 * Not thread safe- do not call while plugs are added or removed. | |
| 322 * @param prior pass in 'NULL' to get the first (most recent) plug, | |
| 323 * otherwise pass the value returned on a prior call to uplug_nextPlug | |
| 324 * @return the next oldest plugin, or NULL if no more. | |
| 325 * @internal ICU 4.4 Technology Preview | |
| 326 */ | |
| 327 U_CAPI UPlugData* U_EXPORT2 | |
| 328 uplug_nextPlug(UPlugData *prior); | |
| 329 | |
| 330 /** | |
| 331 * Inject a plugin as if it were loaded from a library. | |
| 332 * This is useful for testing plugins. | |
| 333 * Note that it will have a 'NULL' library pointer associated | |
| 334 * with it, and therefore no llibrary will be closed at cleanup time. | |
| 335 * Low level plugins may not be able to load, as ordering can't be enforced. | |
| 336 * @param entrypoint entrypoint to install | |
| 337 * @param config user specified configuration string, if available, or NULL. | |
| 338 * @param status error result | |
| 339 * @return the new UPlugData associated with this plugin, or NULL if error. | |
| 340 * @internal ICU 4.4 Technology Preview | |
| 341 */ | |
| 342 U_CAPI UPlugData* U_EXPORT2 | |
| 343 uplug_loadPlugFromEntrypoint(UPlugEntrypoint *entrypoint, const char *config, UE
rrorCode *status); | |
| 344 | |
| 345 | |
| 346 /** | |
| 347 * Inject a plugin from a library, as if the information came from a config file
. | |
| 348 * Low level plugins may not be able to load, and ordering can't be enforced. | |
| 349 * @param libName DLL name to load | |
| 350 * @param sym symbol of plugin (UPlugEntrypoint function) | |
| 351 * @param config configuration string, or NULL | |
| 352 * @param status error result | |
| 353 * @return the new UPlugData associated with this plugin, or NULL if error. | |
| 354 * @internal ICU 4.4 Technology Preview | |
| 355 */ | |
| 356 U_CAPI UPlugData* U_EXPORT2 | |
| 357 uplug_loadPlugFromLibrary(const char *libName, const char *sym, const char *conf
ig, UErrorCode *status); | |
| 358 | |
| 359 /** | |
| 360 * Remove a plugin. | |
| 361 * Will request the plugin to be unloaded, and close the library if needed | |
| 362 * @param plug plugin handle to close | |
| 363 * @param status error result | |
| 364 * @internal ICU 4.4 Technology Preview | |
| 365 */ | |
| 366 U_CAPI void U_EXPORT2 | |
| 367 uplug_removePlug(UPlugData *plug, UErrorCode *status); | |
| 368 | |
| 369 | |
| 370 #endif | |
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Chromium Code Reviews
Issue 19276009:
Move ICU headers part 1 (Closed)
Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/icu46/