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Diffstat (limited to 'src/pulsecore/database-gdbm.c')
| -rw-r--r-- | src/pulsecore/database-gdbm.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/src/pulsecore/database-gdbm.c b/src/pulsecore/database-gdbm.c new file mode 100644 index 0000000..b39f7de --- /dev/null +++ b/src/pulsecore/database-gdbm.c @@ -0,0 +1,244 @@ +/*** + This file is part of PulseAudio. + + Copyright 2009 Lennart Poettering + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + PulseAudio 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <errno.h> +#include <gdbm.h> + +#include <pulse/xmalloc.h> +#include <pulsecore/core-util.h> +#include <pulsecore/log.h> + +#include "database.h" + +#define MAKE_GDBM_FILE(x) ((GDBM_FILE) (x)) + +static inline datum* datum_to_gdbm(datum *to, const pa_datum *from) { + pa_assert(from); + pa_assert(to); + + to->dptr = from->data; + to->dsize = from->size; + + return to; +} + +static inline pa_datum* datum_from_gdbm(pa_datum *to, const datum *from) { + pa_assert(from); + pa_assert(to); + + to->data = from->dptr; + to->size = from->dsize; + + return to; +} + +void pa_datum_free(pa_datum *d) { + pa_assert(d); + + free(d->data); /* gdbm uses raw malloc/free hence we should do that here, too */ + pa_zero(d); +} + +const char* pa_database_get_filename_suffix(void) { + return ".gdbm"; +} + +pa_database* pa_database_open_internal(const char *path, bool for_write) { + GDBM_FILE f; + int gdbm_cache_size; + + pa_assert(path); + + errno = 0; + + /* We need to set the block size explicitly here, since otherwise + * gdbm takes the native block size of the underlying file system + * which might be incredibly large. */ + f = gdbm_open((char*) path, 1024, GDBM_NOLOCK | (for_write ? GDBM_WRCREAT : GDBM_READER), 0644, NULL); + + if (f) + pa_log_debug("Opened GDBM database '%s'", path); + + if (!f) { + if (errno == 0) + errno = EIO; + return NULL; + } + + /* By default the cache of gdbm is rather large, let's reduce it a bit to save memory */ + gdbm_cache_size = 10; + gdbm_setopt(f, GDBM_CACHESIZE, &gdbm_cache_size, sizeof(gdbm_cache_size)); + + return (pa_database*) f; +} + +void pa_database_close(pa_database *db) { + pa_assert(db); + + gdbm_close(MAKE_GDBM_FILE(db)); +} + +pa_datum* pa_database_get(pa_database *db, const pa_datum *key, pa_datum* data) { + datum gdbm_key, gdbm_data; + + pa_assert(db); + pa_assert(key); + pa_assert(data); + + gdbm_data = gdbm_fetch(MAKE_GDBM_FILE(db), *datum_to_gdbm(&gdbm_key, key)); + + return gdbm_data.dptr ? + datum_from_gdbm(data, &gdbm_data) : + NULL; +} + +int pa_database_set(pa_database *db, const pa_datum *key, const pa_datum* data, bool overwrite) { + datum gdbm_key, gdbm_data; + + pa_assert(db); + pa_assert(key); + pa_assert(data); + + return gdbm_store(MAKE_GDBM_FILE(db), + *datum_to_gdbm(&gdbm_key, key), + *datum_to_gdbm(&gdbm_data, data), + overwrite ? GDBM_REPLACE : GDBM_INSERT) != 0 ? -1 : 0; +} + +int pa_database_unset(pa_database *db, const pa_datum *key) { + datum gdbm_key; + + pa_assert(db); + pa_assert(key); + + return gdbm_delete(MAKE_GDBM_FILE(db), *datum_to_gdbm(&gdbm_key, key)) != 0 ? -1 : 0; +} + +int pa_database_clear(pa_database *db) { + datum gdbm_key; + + pa_assert(db); + + gdbm_key = gdbm_firstkey(MAKE_GDBM_FILE(db)); + + while (gdbm_key.dptr) { + datum next; + + next = gdbm_nextkey(MAKE_GDBM_FILE(db), gdbm_key); + + gdbm_delete(MAKE_GDBM_FILE(db), gdbm_key); + + free(gdbm_key.dptr); + gdbm_key = next; + } + + return gdbm_reorganize(MAKE_GDBM_FILE(db)) == 0 ? 0 : -1; +} + +signed pa_database_size(pa_database *db) { + datum gdbm_key; + unsigned n = 0; + + pa_assert(db); + + /* This sucks */ + + gdbm_key = gdbm_firstkey(MAKE_GDBM_FILE(db)); + + while (gdbm_key.dptr) { + datum next; + + n++; + + next = gdbm_nextkey(MAKE_GDBM_FILE(db), gdbm_key); + free(gdbm_key.dptr); + gdbm_key = next; + } + + return (signed) n; +} + +pa_datum* pa_database_first(pa_database *db, pa_datum *key, pa_datum *data) { + datum gdbm_key, gdbm_data; + + pa_assert(db); + pa_assert(key); + + gdbm_key = gdbm_firstkey(MAKE_GDBM_FILE(db)); + + if (!gdbm_key.dptr) + return NULL; + + if (data) { + gdbm_data = gdbm_fetch(MAKE_GDBM_FILE(db), gdbm_key); + + if (!gdbm_data.dptr) { + free(gdbm_key.dptr); + return NULL; + } + + datum_from_gdbm(data, &gdbm_data); + } + + datum_from_gdbm(key, &gdbm_key); + + return key; +} + +pa_datum* pa_database_next(pa_database *db, const pa_datum *key, pa_datum *next, pa_datum *data) { + datum gdbm_key, gdbm_data; + + pa_assert(db); + pa_assert(key); + pa_assert(next); + + if (!key) + return pa_database_first(db, next, data); + + gdbm_key = gdbm_nextkey(MAKE_GDBM_FILE(db), *datum_to_gdbm(&gdbm_key, key)); + + if (!gdbm_key.dptr) + return NULL; + + if (data) { + gdbm_data = gdbm_fetch(MAKE_GDBM_FILE(db), gdbm_key); + + if (!gdbm_data.dptr) { + free(gdbm_key.dptr); + return NULL; + } + + datum_from_gdbm(data, &gdbm_data); + } + + datum_from_gdbm(next, &gdbm_key); + + return next; +} + +int pa_database_sync(pa_database *db) { + pa_assert(db); + + gdbm_sync(MAKE_GDBM_FILE(db)); + return 0; +} |