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Diffstat (limited to 'src/Mapper.cxx')
-rw-r--r-- | src/Mapper.cxx | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/src/Mapper.cxx b/src/Mapper.cxx new file mode 100644 index 000000000..4d863418b --- /dev/null +++ b/src/Mapper.cxx @@ -0,0 +1,297 @@ +/* + * Copyright (C) 2003-2013 The Music Player Daemon Project + * http://www.musicpd.org + * + * 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 2 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, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +/* + * Maps directory and song objects to file system paths. + */ + +#include "config.h" +#include "Mapper.hxx" +#include "Directory.hxx" +#include "song.h" + +extern "C" { +#include "path.h" +} + +#include <glib.h> + +#include <assert.h> +#include <string.h> +#include <sys/stat.h> +#include <unistd.h> +#include <errno.h> +#include <dirent.h> + +/** + * The absolute path of the music directory encoded in UTF-8. + */ +static char *music_dir_utf8; +static size_t music_dir_utf8_length; + +/** + * The absolute path of the music directory encoded in the filesystem + * character set. + */ +static char *music_dir_fs; +static size_t music_dir_fs_length; + +/** + * The absolute path of the playlist directory encoded in the + * filesystem character set. + */ +static char *playlist_dir_fs; + +/** + * Duplicate a string, chop all trailing slashes. + */ +static char * +strdup_chop_slash(const char *path_fs) +{ + size_t length = strlen(path_fs); + + while (length > 0 && path_fs[length - 1] == G_DIR_SEPARATOR) + --length; + + return g_strndup(path_fs, length); +} + +static void +check_directory(const char *path) +{ + struct stat st; + if (stat(path, &st) < 0) { + g_warning("Failed to stat directory \"%s\": %s", + path, g_strerror(errno)); + return; + } + + if (!S_ISDIR(st.st_mode)) { + g_warning("Not a directory: %s", path); + return; + } + +#ifndef WIN32 + char *x = g_build_filename(path, ".", NULL); + if (stat(x, &st) < 0 && errno == EACCES) + g_warning("No permission to traverse (\"execute\") directory: %s", + path); + g_free(x); +#endif + + DIR *dir = opendir(path); + if (dir != NULL) + closedir(dir); + else if (errno == EACCES) + g_warning("No permission to read directory: %s", path); +} + +static void +mapper_set_music_dir(const char *path_utf8) +{ + music_dir_utf8 = strdup_chop_slash(path_utf8); + music_dir_utf8_length = strlen(music_dir_utf8); + + music_dir_fs = utf8_to_fs_charset(music_dir_utf8); + check_directory(music_dir_fs); + music_dir_fs_length = strlen(music_dir_fs); +} + +static void +mapper_set_playlist_dir(const char *path_utf8) +{ + playlist_dir_fs = utf8_to_fs_charset(path_utf8); + check_directory(playlist_dir_fs); +} + +void mapper_init(const char *_music_dir, const char *_playlist_dir) +{ + if (_music_dir != NULL) + mapper_set_music_dir(_music_dir); + + if (_playlist_dir != NULL) + mapper_set_playlist_dir(_playlist_dir); +} + +void mapper_finish(void) +{ + g_free(music_dir_utf8); + g_free(music_dir_fs); + g_free(playlist_dir_fs); +} + +const char * +mapper_get_music_directory_utf8(void) +{ + return music_dir_utf8; +} + +const char * +mapper_get_music_directory_fs(void) +{ + return music_dir_fs; +} + +const char * +map_to_relative_path(const char *path_utf8) +{ + return music_dir_utf8 != NULL && + memcmp(path_utf8, music_dir_utf8, + music_dir_utf8_length) == 0 && + G_IS_DIR_SEPARATOR(path_utf8[music_dir_utf8_length]) + ? path_utf8 + music_dir_utf8_length + 1 + : path_utf8; +} + +char * +map_uri_fs(const char *uri) +{ + char *uri_fs, *path_fs; + + assert(uri != NULL); + assert(*uri != '/'); + + if (music_dir_fs == NULL) + return NULL; + + uri_fs = utf8_to_fs_charset(uri); + if (uri_fs == NULL) + return NULL; + + path_fs = g_build_filename(music_dir_fs, uri_fs, NULL); + g_free(uri_fs); + + return path_fs; +} + +char * +map_directory_fs(const Directory *directory) +{ + assert(music_dir_utf8 != NULL); + assert(music_dir_fs != NULL); + + if (directory->IsRoot()) + return g_strdup(music_dir_fs); + + return map_uri_fs(directory->GetPath()); +} + +char * +map_directory_child_fs(const Directory *directory, const char *name) +{ + assert(music_dir_utf8 != NULL); + assert(music_dir_fs != NULL); + + char *name_fs, *parent_fs, *path; + + /* check for invalid or unauthorized base names */ + if (*name == 0 || strchr(name, '/') != NULL || + strcmp(name, ".") == 0 || strcmp(name, "..") == 0) + return NULL; + + parent_fs = map_directory_fs(directory); + if (parent_fs == NULL) + return NULL; + + name_fs = utf8_to_fs_charset(name); + if (name_fs == NULL) { + g_free(parent_fs); + return NULL; + } + + path = g_build_filename(parent_fs, name_fs, NULL); + g_free(parent_fs); + g_free(name_fs); + + return path; +} + +/** + * Map a song object that was created by song_dup_detached(). It does + * not have a real parent directory, only the dummy object + * #detached_root. + */ +static char * +map_detached_song_fs(const char *uri_utf8) +{ + char *uri_fs = utf8_to_fs_charset(uri_utf8); + if (uri_fs == NULL) + return NULL; + + char *path = g_build_filename(music_dir_fs, uri_fs, NULL); + g_free(uri_fs); + return path; +} + +char * +map_song_fs(const struct song *song) +{ + assert(song_is_file(song)); + + if (song_in_database(song)) + return song_is_detached(song) + ? map_detached_song_fs(song->uri) + : map_directory_child_fs(song->parent, song->uri); + else + return utf8_to_fs_charset(song->uri); +} + +char * +map_fs_to_utf8(const char *path_fs) +{ + if (music_dir_fs != NULL && + strncmp(path_fs, music_dir_fs, music_dir_fs_length) == 0 && + G_IS_DIR_SEPARATOR(path_fs[music_dir_fs_length])) + /* remove musicDir prefix */ + path_fs += music_dir_fs_length + 1; + else if (G_IS_DIR_SEPARATOR(path_fs[0])) + /* not within musicDir */ + return NULL; + + while (path_fs[0] == G_DIR_SEPARATOR) + ++path_fs; + + return fs_charset_to_utf8(path_fs); +} + +const char * +map_spl_path(void) +{ + return playlist_dir_fs; +} + +char * +map_spl_utf8_to_fs(const char *name) +{ + char *filename_utf8, *filename_fs, *path; + + if (playlist_dir_fs == NULL) + return NULL; + + filename_utf8 = g_strconcat(name, PLAYLIST_FILE_SUFFIX, NULL); + filename_fs = utf8_to_fs_charset(filename_utf8); + g_free(filename_utf8); + if (filename_fs == NULL) + return NULL; + + path = g_build_filename(playlist_dir_fs, filename_fs, NULL); + g_free(filename_fs); + + return path; +} |