/* This file is part of fake-extractor. (C) 2002, 2003, 2004, 2005, 2006, 2009, 2012 Vidyut Samanta and Christian Grothoff This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #ifndef EXTRACTOR_H #define EXTRACTOR_H #ifdef __cplusplus extern "C" { #if 0 /* keep Emacsens' auto-indent happy */ } #endif #endif #include /** * 0.2.6-1 => 0x00020601 * 4.5.2-0 => 0x04050200 */ #define EXTRACTOR_VERSION 0x01000000 #include /** * Options for how plugin execution should be done. */ enum EXTRACTOR_Options { /** * Run plugin out-of-process, starting the process once the plugin * is to be run. If a plugin crashes, automatically restart the * respective process for the same file and try once more * (since the crash may be caused by the previous file). If * the process crashes immediately again, it is not restarted * until the next file. */ EXTRACTOR_OPTION_DEFAULT_POLICY = 0, /** * Deprecated option. Ignored. */ EXTRACTOR_OPTION_OUT_OF_PROCESS_NO_RESTART = 1, /** * Run plugins in-process. Unsafe, not recommended, * can be nice for debugging. */ EXTRACTOR_OPTION_IN_PROCESS = 2, /** * Internal value for plugins that have been disabled. */ EXTRACTOR_OPTION_DISABLED = 3 }; /** * Format in which the extracted meta data is presented. */ enum EXTRACTOR_MetaFormat { /** * Format is unknown. */ EXTRACTOR_METAFORMAT_UNKNOWN = 0, /** * 0-terminated, UTF-8 encoded string. "data_len" * is strlen(data)+1. */ EXTRACTOR_METAFORMAT_UTF8 = 1, /** * Some kind of binary format, see given Mime type. */ EXTRACTOR_METAFORMAT_BINARY = 2, /** * 0-terminated string. The specific encoding is unknown. * "data_len" is strlen(data)+1. */ EXTRACTOR_METAFORMAT_C_STRING = 3 }; /** * Enumeration defining various sources of keywords. See also * http://dublincore.org/documents/1998/09/dces/ */ enum EXTRACTOR_MetaType { /* fundamental types */ EXTRACTOR_METATYPE_RESERVED = 0, EXTRACTOR_METATYPE_MIMETYPE = 1, EXTRACTOR_METATYPE_FILENAME = 2, EXTRACTOR_METATYPE_COMMENT = 3, /* Standard types from bibtex */ EXTRACTOR_METATYPE_TITLE = 4, EXTRACTOR_METATYPE_BOOK_TITLE = 5, EXTRACTOR_METATYPE_BOOK_EDITION = 6, EXTRACTOR_METATYPE_BOOK_CHAPTER_NUMBER = 7, EXTRACTOR_METATYPE_JOURNAL_NAME = 8, EXTRACTOR_METATYPE_JOURNAL_VOLUME = 9, EXTRACTOR_METATYPE_JOURNAL_NUMBER = 10, EXTRACTOR_METATYPE_PAGE_COUNT = 11, EXTRACTOR_METATYPE_PAGE_RANGE = 12, EXTRACTOR_METATYPE_AUTHOR_NAME = 13, EXTRACTOR_METATYPE_AUTHOR_EMAIL = 14, EXTRACTOR_METATYPE_AUTHOR_INSTITUTION = 15, EXTRACTOR_METATYPE_PUBLISHER = 16, EXTRACTOR_METATYPE_PUBLISHER_ADDRESS = 17, EXTRACTOR_METATYPE_PUBLISHER_INSTITUTION = 18, EXTRACTOR_METATYPE_PUBLISHER_SERIES = 19, EXTRACTOR_METATYPE_PUBLICATION_TYPE = 20, EXTRACTOR_METATYPE_PUBLICATION_YEAR = 21, EXTRACTOR_METATYPE_PUBLICATION_MONTH = 22, EXTRACTOR_METATYPE_PUBLICATION_DAY = 23, EXTRACTOR_METATYPE_PUBLICATION_DATE = 24, EXTRACTOR_METATYPE_BIBTEX_EPRINT = 25, EXTRACTOR_METATYPE_BIBTEX_ENTRY_TYPE = 26, EXTRACTOR_METATYPE_LANGUAGE = 27, EXTRACTOR_METATYPE_CREATION_TIME = 28, EXTRACTOR_METATYPE_URL = 29, /* "unique" document identifiers */ EXTRACTOR_METATYPE_URI = 30, EXTRACTOR_METATYPE_ISRC = 31, EXTRACTOR_METATYPE_HASH_MD4 = 32, EXTRACTOR_METATYPE_HASH_MD5 = 33, EXTRACTOR_METATYPE_HASH_SHA0 = 34, EXTRACTOR_METATYPE_HASH_SHA1 = 35, EXTRACTOR_METATYPE_HASH_RMD160 = 36, /* identifiers of a location */ EXTRACTOR_METATYPE_GPS_LATITUDE_REF = 37, EXTRACTOR_METATYPE_GPS_LATITUDE = 38, EXTRACTOR_METATYPE_GPS_LONGITUDE_REF = 39, EXTRACTOR_METATYPE_GPS_LONGITUDE = 40, EXTRACTOR_METATYPE_LOCATION_CITY = 41, EXTRACTOR_METATYPE_LOCATION_SUBLOCATION = 42, EXTRACTOR_METATYPE_LOCATION_COUNTRY = 43, EXTRACTOR_METATYPE_LOCATION_COUNTRY_CODE = 44, /* generic attributes */ EXTRACTOR_METATYPE_UNKNOWN = 45, EXTRACTOR_METATYPE_DESCRIPTION = 46, EXTRACTOR_METATYPE_COPYRIGHT = 47, EXTRACTOR_METATYPE_RIGHTS = 48, EXTRACTOR_METATYPE_KEYWORDS = 49, EXTRACTOR_METATYPE_ABSTRACT = 50, EXTRACTOR_METATYPE_SUMMARY = 51, EXTRACTOR_METATYPE_SUBJECT = 52, EXTRACTOR_METATYPE_CREATOR = 53, EXTRACTOR_METATYPE_FORMAT = 54, EXTRACTOR_METATYPE_FORMAT_VERSION = 55, /* processing history */ EXTRACTOR_METATYPE_CREATED_BY_SOFTWARE = 56, EXTRACTOR_METATYPE_UNKNOWN_DATE = 57, EXTRACTOR_METATYPE_CREATION_DATE = 58, EXTRACTOR_METATYPE_MODIFICATION_DATE = 59, EXTRACTOR_METATYPE_LAST_PRINTED = 60, EXTRACTOR_METATYPE_LAST_SAVED_BY = 61, EXTRACTOR_METATYPE_TOTAL_EDITING_TIME = 62, EXTRACTOR_METATYPE_EDITING_CYCLES = 63, EXTRACTOR_METATYPE_MODIFIED_BY_SOFTWARE = 64, EXTRACTOR_METATYPE_REVISION_HISTORY = 65, EXTRACTOR_METATYPE_EMBEDDED_FILE_SIZE = 66, EXTRACTOR_METATYPE_FINDER_FILE_TYPE = 67, EXTRACTOR_METATYPE_FINDER_FILE_CREATOR = 68, /* software package specifics (deb, rpm, tgz, elf) */ EXTRACTOR_METATYPE_PACKAGE_NAME = 69, EXTRACTOR_METATYPE_PACKAGE_VERSION = 70, EXTRACTOR_METATYPE_SECTION = 71, EXTRACTOR_METATYPE_UPLOAD_PRIORITY = 72, EXTRACTOR_METATYPE_PACKAGE_DEPENDENCY = 73, EXTRACTOR_METATYPE_PACKAGE_CONFLICTS = 74, EXTRACTOR_METATYPE_PACKAGE_REPLACES = 75, EXTRACTOR_METATYPE_PACKAGE_PROVIDES = 76, EXTRACTOR_METATYPE_PACKAGE_RECOMMENDS = 77, EXTRACTOR_METATYPE_PACKAGE_SUGGESTS = 78, EXTRACTOR_METATYPE_PACKAGE_MAINTAINER = 79, EXTRACTOR_METATYPE_PACKAGE_INSTALLED_SIZE = 80, EXTRACTOR_METATYPE_PACKAGE_SOURCE = 81, EXTRACTOR_METATYPE_PACKAGE_ESSENTIAL = 82, EXTRACTOR_METATYPE_TARGET_ARCHITECTURE = 83, EXTRACTOR_METATYPE_PACKAGE_PRE_DEPENDENCY = 84, EXTRACTOR_METATYPE_LICENSE = 85, EXTRACTOR_METATYPE_PACKAGE_DISTRIBUTION = 86, EXTRACTOR_METATYPE_BUILDHOST = 87, EXTRACTOR_METATYPE_VENDOR = 88, EXTRACTOR_METATYPE_TARGET_OS = 89, EXTRACTOR_METATYPE_SOFTWARE_VERSION = 90, EXTRACTOR_METATYPE_TARGET_PLATFORM = 91, EXTRACTOR_METATYPE_RESOURCE_TYPE = 92, EXTRACTOR_METATYPE_LIBRARY_SEARCH_PATH = 93, EXTRACTOR_METATYPE_LIBRARY_DEPENDENCY = 94, /* photography specifics */ EXTRACTOR_METATYPE_CAMERA_MAKE = 95, EXTRACTOR_METATYPE_CAMERA_MODEL = 96, EXTRACTOR_METATYPE_EXPOSURE = 97, EXTRACTOR_METATYPE_APERTURE = 98, EXTRACTOR_METATYPE_EXPOSURE_BIAS = 99, EXTRACTOR_METATYPE_FLASH = 100, EXTRACTOR_METATYPE_FLASH_BIAS = 101, EXTRACTOR_METATYPE_FOCAL_LENGTH = 102, EXTRACTOR_METATYPE_FOCAL_LENGTH_35MM = 103, EXTRACTOR_METATYPE_ISO_SPEED = 104, EXTRACTOR_METATYPE_EXPOSURE_MODE = 105, EXTRACTOR_METATYPE_METERING_MODE = 106, EXTRACTOR_METATYPE_MACRO_MODE = 107, EXTRACTOR_METATYPE_IMAGE_QUALITY = 108, EXTRACTOR_METATYPE_WHITE_BALANCE = 109, EXTRACTOR_METATYPE_ORIENTATION = 110, EXTRACTOR_METATYPE_MAGNIFICATION = 111, /* image specifics */ EXTRACTOR_METATYPE_IMAGE_DIMENSIONS = 112, EXTRACTOR_METATYPE_PRODUCED_BY_SOFTWARE = 113, EXTRACTOR_METATYPE_THUMBNAIL = 114, EXTRACTOR_METATYPE_IMAGE_RESOLUTION = 115, EXTRACTOR_METATYPE_SOURCE = 116, /* (text) document processing specifics */ EXTRACTOR_METATYPE_CHARACTER_SET = 117, EXTRACTOR_METATYPE_LINE_COUNT = 118, EXTRACTOR_METATYPE_PARAGRAPH_COUNT = 119, EXTRACTOR_METATYPE_WORD_COUNT = 120, EXTRACTOR_METATYPE_CHARACTER_COUNT = 121, EXTRACTOR_METATYPE_PAGE_ORIENTATION = 122, EXTRACTOR_METATYPE_PAPER_SIZE = 123, EXTRACTOR_METATYPE_TEMPLATE = 124, EXTRACTOR_METATYPE_COMPANY = 125, EXTRACTOR_METATYPE_MANAGER = 126, EXTRACTOR_METATYPE_REVISION_NUMBER = 127, /* music / video specifics */ EXTRACTOR_METATYPE_DURATION = 128, EXTRACTOR_METATYPE_ALBUM = 129, EXTRACTOR_METATYPE_ARTIST = 130, EXTRACTOR_METATYPE_GENRE = 131, EXTRACTOR_METATYPE_TRACK_NUMBER = 132, EXTRACTOR_METATYPE_DISC_NUMBER = 133, EXTRACTOR_METATYPE_PERFORMER = 134, EXTRACTOR_METATYPE_CONTACT_INFORMATION = 135, EXTRACTOR_METATYPE_SONG_VERSION = 136, EXTRACTOR_METATYPE_PICTURE = 137, EXTRACTOR_METATYPE_COVER_PICTURE = 138, EXTRACTOR_METATYPE_CONTRIBUTOR_PICTURE = 139, EXTRACTOR_METATYPE_EVENT_PICTURE = 140, EXTRACTOR_METATYPE_LOGO = 141, EXTRACTOR_METATYPE_BROADCAST_TELEVISION_SYSTEM = 142, EXTRACTOR_METATYPE_SOURCE_DEVICE = 143, EXTRACTOR_METATYPE_DISCLAIMER = 144, EXTRACTOR_METATYPE_WARNING = 145, EXTRACTOR_METATYPE_PAGE_ORDER = 146, EXTRACTOR_METATYPE_WRITER = 147, EXTRACTOR_METATYPE_PRODUCT_VERSION = 148, EXTRACTOR_METATYPE_CONTRIBUTOR_NAME = 149, EXTRACTOR_METATYPE_MOVIE_DIRECTOR = 150, EXTRACTOR_METATYPE_NETWORK_NAME = 151, EXTRACTOR_METATYPE_SHOW_NAME = 152, EXTRACTOR_METATYPE_CHAPTER_NAME = 153, EXTRACTOR_METATYPE_SONG_COUNT = 154, EXTRACTOR_METATYPE_STARTING_SONG = 155, EXTRACTOR_METATYPE_PLAY_COUNTER = 156, EXTRACTOR_METATYPE_CONDUCTOR = 157, EXTRACTOR_METATYPE_INTERPRETATION = 158, EXTRACTOR_METATYPE_COMPOSER = 159, EXTRACTOR_METATYPE_BEATS_PER_MINUTE = 160, EXTRACTOR_METATYPE_ENCODED_BY = 161, EXTRACTOR_METATYPE_ORIGINAL_TITLE = 162, EXTRACTOR_METATYPE_ORIGINAL_ARTIST = 163, EXTRACTOR_METATYPE_ORIGINAL_WRITER = 164, EXTRACTOR_METATYPE_ORIGINAL_RELEASE_YEAR = 165, EXTRACTOR_METATYPE_ORIGINAL_PERFORMER = 166, EXTRACTOR_METATYPE_LYRICS = 167, EXTRACTOR_METATYPE_POPULARITY_METER = 168, EXTRACTOR_METATYPE_LICENSEE = 169, EXTRACTOR_METATYPE_MUSICIAN_CREDITS_LIST = 170, EXTRACTOR_METATYPE_MOOD = 171, EXTRACTOR_METATYPE_SUBTITLE = 172, /* GNUnet specific values (never extracted) */ EXTRACTOR_METATYPE_GNUNET_DISPLAY_TYPE = 173, EXTRACTOR_METATYPE_GNUNET_FULL_DATA = 174, EXTRACTOR_METATYPE_RATING = 175, EXTRACTOR_METATYPE_ORGANIZATION = 176, EXTRACTOR_METATYPE_RIPPER = 177, EXTRACTOR_METATYPE_PRODUCER = 178, EXTRACTOR_METATYPE_GROUP = 179, EXTRACTOR_METATYPE_GNUNET_ORIGINAL_FILENAME = 180, EXTRACTOR_METATYPE_DISC_COUNT = 181, EXTRACTOR_METATYPE_CODEC = 182, EXTRACTOR_METATYPE_VIDEO_CODEC = 183, EXTRACTOR_METATYPE_AUDIO_CODEC = 184, EXTRACTOR_METATYPE_SUBTITLE_CODEC = 185, EXTRACTOR_METATYPE_CONTAINER_FORMAT = 186, EXTRACTOR_METATYPE_BITRATE = 187, EXTRACTOR_METATYPE_NOMINAL_BITRATE = 188, EXTRACTOR_METATYPE_MINIMUM_BITRATE = 189, EXTRACTOR_METATYPE_MAXIMUM_BITRATE = 190, EXTRACTOR_METATYPE_SERIAL = 191, EXTRACTOR_METATYPE_ENCODER = 192, EXTRACTOR_METATYPE_ENCODER_VERSION = 193, EXTRACTOR_METATYPE_TRACK_GAIN = 194, EXTRACTOR_METATYPE_TRACK_PEAK = 195, EXTRACTOR_METATYPE_ALBUM_GAIN = 196, EXTRACTOR_METATYPE_ALBUM_PEAK = 197, EXTRACTOR_METATYPE_REFERENCE_LEVEL = 198, EXTRACTOR_METATYPE_LOCATION_NAME = 199, EXTRACTOR_METATYPE_LOCATION_ELEVATION = 200, EXTRACTOR_METATYPE_LOCATION_HORIZONTAL_ERROR = 201, EXTRACTOR_METATYPE_LOCATION_MOVEMENT_SPEED = 202, EXTRACTOR_METATYPE_LOCATION_MOVEMENT_DIRECTION = 203, EXTRACTOR_METATYPE_LOCATION_CAPTURE_DIRECTION = 204, EXTRACTOR_METATYPE_SHOW_EPISODE_NUMBER = 205, EXTRACTOR_METATYPE_SHOW_SEASON_NUMBER = 206, EXTRACTOR_METATYPE_GROUPING = 207, EXTRACTOR_METATYPE_DEVICE_MANUFACTURER = 208, EXTRACTOR_METATYPE_DEVICE_MODEL = 209, EXTRACTOR_METATYPE_AUDIO_LANGUAGE = 210, EXTRACTOR_METATYPE_CHANNELS = 211, EXTRACTOR_METATYPE_SAMPLE_RATE = 212, EXTRACTOR_METATYPE_AUDIO_DEPTH = 213, EXTRACTOR_METATYPE_AUDIO_BITRATE = 214, EXTRACTOR_METATYPE_MAXIMUM_AUDIO_BITRATE = 215, EXTRACTOR_METATYPE_VIDEO_DIMENSIONS = 216, EXTRACTOR_METATYPE_VIDEO_DEPTH = 217, EXTRACTOR_METATYPE_FRAME_RATE = 218, EXTRACTOR_METATYPE_PIXEL_ASPECT_RATIO = 219, EXTRACTOR_METATYPE_VIDEO_BITRATE = 220, EXTRACTOR_METATYPE_MAXIMUM_VIDEO_BITRATE = 221, EXTRACTOR_METATYPE_SUBTITLE_LANGUAGE = 222, EXTRACTOR_METATYPE_VIDEO_LANGUAGE = 223, EXTRACTOR_METATYPE_TOC = 224, EXTRACTOR_METATYPE_VIDEO_DURATION = 225, EXTRACTOR_METATYPE_AUDIO_DURATION = 226, EXTRACTOR_METATYPE_SUBTITLE_DURATION = 227, EXTRACTOR_METATYPE_LAST = 228 }; /** * Get the textual name of the keyword. * * @param type meta type to get a UTF-8 string for * @return NULL if the type is not known, otherwise * an English (locale: C) string describing the type; * translate using 'dgettext ("libextractor", rval)' */ const char * EXTRACTOR_metatype_to_string (enum EXTRACTOR_MetaType type); /** * Get a long description for the meta type. * * @param type meta type to get a UTF-8 description for * @return NULL if the type is not known, otherwise * an English (locale: C) string describing the type; * translate using 'dgettext ("libextractor", rval)' */ const char * EXTRACTOR_metatype_to_description (enum EXTRACTOR_MetaType type); /** * Return the highest type number, exclusive as in [0,max). * * @return highest legal metatype number for this version of libextractor */ enum EXTRACTOR_MetaType EXTRACTOR_metatype_get_max (void); /** * Type of a function that libextractor calls for each * meta data item found. * * @param cls closure (user-defined) * @param plugin_name name of the plugin that produced this value; * special values can be used (i.e. '<zlib>' for zlib being * used in the main libextractor library and yielding * meta data). * @param type libextractor-type describing the meta data * @param format basic format information about data * @param data_mime_type mime-type of data (not of the original file); * can be NULL (if mime-type is not known) * @param data actual meta-data found * @param data_len number of bytes in data * @return 0 to continue extracting, 1 to abort */ typedef int (*EXTRACTOR_MetaDataProcessor) (void *cls, const char *plugin_name, enum EXTRACTOR_MetaType type, enum EXTRACTOR_MetaFormat format, const char *data_mime_type, const char *data, size_t data_len); /** * Context provided for plugins that perform meta data extraction. */ struct EXTRACTOR_ExtractContext { /** * Closure argument to pass to all callbacks. */ void *cls; /** * Configuration string for the plugin. */ const char *config; /** * Obtain a pointer to up to 'size' bytes of data from the file to process. * * @param cls the 'cls' member of this struct * @param data pointer to set to the file data, set to NULL on error * @param size maximum number of bytes requested * @return number of bytes now available in data (can be smaller than 'size'), * -1 on error */ ssize_t (*read) (void *cls, void **data, size_t size); /** * Seek in the file. Use 'SEEK_CUR' for whence and 'pos' of 0 to * obtain the current position in the file. * * @param cls the 'cls' member of this struct * @param pos position to seek (see 'man lseek') * @param whence how to see (absolute to start, relative, absolute to end) * @return new absolute position, -1 on error (i.e. desired position * does not exist) */ int64_t (*seek) (void *cls, int64_t pos, int whence); /** * Determine the overall size of the file. * * @param cls the 'cls' member of this struct * @return overall file size, UINT64_MAX on error (i.e. IPC failure) */ uint64_t (*get_size) (void *cls); /** * Function to call on extracted data. */ EXTRACTOR_MetaDataProcessor proc; }; /** * Signature of the extract method that each plugin * must provide. * * @param ec extraction context provided to the plugin */ typedef void (*EXTRACTOR_extract_method) (struct EXTRACTOR_ExtractContext *ec); /** * Linked list of extractor plugins. An application builds this list * by telling libextractor to load various keyword-extraction * plugins. Libraries can also be unloaded (removed from this list, * see EXTRACTOR_plugin_remove). */ struct EXTRACTOR_PluginList; /** * Load the default set of plugins. The default can be changed * by setting the LIBEXTRACTOR_LIBRARIES environment variable; * If it is set to "env", then this function will return * EXTRACTOR_plugin_add_config (NULL, env, flags). * * If LIBEXTRACTOR_LIBRARIES is not set, the function will attempt * to locate the installed plugins and load all of them. * The directory where the code will search for plugins is typically * automatically determined; it can be specified explicitly using the * "LIBEXTRACTOR_PREFIX" environment variable. * * This environment variable must be set to the precise directory with * the plugins (i.e. "/usr/lib/libextractor", not "/usr"). Note that * setting the environment variable will disable all of the methods * that are typically used to determine the location of plugins. * Multiple paths can be specified using ':' to separate them. * * @param flags options for all of the plugins loaded * @return the default set of plugins, NULL if no plugins were found */ struct EXTRACTOR_PluginList * EXTRACTOR_plugin_add_defaults (enum EXTRACTOR_Options flags); /** * Add a library for keyword extraction. * * @param prev the previous list of libraries, may be NULL * @param library the name of the library (short handle, i.e. "mime") * @param options options to give to the library * @param flags options to use * @return the new list of libraries, equal to prev iff an error occured */ struct EXTRACTOR_PluginList * EXTRACTOR_plugin_add (struct EXTRACTOR_PluginList * prev, const char *library, const char *options, enum EXTRACTOR_Options flags); /** * Load multiple libraries as specified by the user. * * @param config a string given by the user that defines which * libraries should be loaded. Has the format * "[[-]LIBRARYNAME[(options)][:[-]LIBRARYNAME[(options)]]]*". * For example, 'mp3:ogg' loads the * mp3 and the ogg plugins. The '-' before the LIBRARYNAME * indicates that the library should be removed from * the library list. * @param prev the previous list of libraries, may be NULL * @param flags options to use * @return the new list of libraries, equal to prev iff an error occured * or if config was empty (or NULL). */ struct EXTRACTOR_PluginList * EXTRACTOR_plugin_add_config (struct EXTRACTOR_PluginList *prev, const char *config, enum EXTRACTOR_Options flags); /** * Remove a plugin from a list. * * @param prev the current list of plugins * @param library the name of the plugin to remove (short handle) * @return the reduced list, unchanged if the plugin was not loaded */ struct EXTRACTOR_PluginList * EXTRACTOR_plugin_remove (struct EXTRACTOR_PluginList *prev, const char *library); /** * Remove all plugins from the given list (destroys the list). * * @param plugin the list of plugins */ void EXTRACTOR_plugin_remove_all (struct EXTRACTOR_PluginList *plugins); /** * Extract keywords from a file using the given set of plugins. * * @param plugins the list of plugins to use * @param filename the name of the file, can be NULL if data is not NULL * @param data data of the file in memory, can be NULL (in which * case libextractor will open file) if filename is not NULL * @param size number of bytes in data, ignored if data is NULL * @param proc function to call for each meta data item found * @param proc_cls cls argument to proc */ void EXTRACTOR_extract (struct EXTRACTOR_PluginList *plugins, const char *filename, const void *data, size_t size, EXTRACTOR_MetaDataProcessor proc, void *proc_cls); /** * Simple EXTRACTOR_MetaDataProcessor implementation that simply * prints the extracted meta data to the given file. Only prints * those keywords that are in UTF-8 format. * * @param handle the file to write to (stdout, stderr), must NOT be NULL, * must be of type "FILE *". * @param plugin_name name of the plugin that produced this value * @param type libextractor-type describing the meta data * @param format basic format information about data * @param data_mime_type mime-type of data (not of the original file); * can be NULL (if mime-type is not known) * @param data actual meta-data found * @param data_len number of bytes in data * @return non-zero if printing failed, otherwise 0. */ int EXTRACTOR_meta_data_print (void * handle, const char *plugin_name, enum EXTRACTOR_MetaType type, enum EXTRACTOR_MetaFormat format, const char *data_mime_type, const char *data, size_t data_len); #if 0 /* keep Emacsens' auto-indent happy */ { #endif #ifdef __cplusplus } #endif #endif