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-rw-r--r--lib/ext2fs/dblist.c403
1 files changed, 403 insertions, 0 deletions
diff --git a/lib/ext2fs/dblist.c b/lib/ext2fs/dblist.c
new file mode 100644
index 0000000..bbdb221
--- /dev/null
+++ b/lib/ext2fs/dblist.c
@@ -0,0 +1,403 @@
+/*
+ * dblist.c -- directory block list functions
+ *
+ * Copyright 1997 by Theodore Ts'o
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+#include "config.h"
+#include <stdio.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <string.h>
+#include <time.h>
+
+#include "ext2_fs.h"
+#include "ext2fsP.h"
+
+static EXT2_QSORT_TYPE dir_block_cmp(const void *a, const void *b);
+static EXT2_QSORT_TYPE dir_block_cmp2(const void *a, const void *b);
+static EXT2_QSORT_TYPE (*sortfunc32)(const void *a, const void *b);
+
+/*
+ * helper function for making a new directory block list (for
+ * initialize and copy).
+ */
+static errcode_t make_dblist(ext2_filsys fs, ext2_ino_t size,
+ ext2_ino_t count,
+ struct ext2_db_entry2 *list,
+ ext2_dblist *ret_dblist)
+{
+ ext2_dblist dblist = NULL;
+ errcode_t retval;
+ ext2_ino_t num_dirs;
+ size_t len;
+
+ EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+ if ((ret_dblist == 0) && fs->dblist &&
+ (fs->dblist->magic == EXT2_ET_MAGIC_DBLIST))
+ return 0;
+
+ retval = ext2fs_get_mem(sizeof(struct ext2_struct_dblist), &dblist);
+ if (retval)
+ goto cleanup;
+ memset(dblist, 0, sizeof(struct ext2_struct_dblist));
+
+ dblist->magic = EXT2_ET_MAGIC_DBLIST;
+ dblist->fs = fs;
+ if (size)
+ dblist->size = size;
+ else {
+ retval = ext2fs_get_num_dirs(fs, &num_dirs);
+ if (retval)
+ goto cleanup;
+ dblist->size = (num_dirs * 2) + 12;
+ }
+ len = (size_t) sizeof(struct ext2_db_entry2) * dblist->size;
+ dblist->count = count;
+ retval = ext2fs_get_array(dblist->size, sizeof(struct ext2_db_entry2),
+ &dblist->list);
+ if (retval)
+ goto cleanup;
+
+ if (list)
+ memcpy(dblist->list, list, len);
+ else
+ memset(dblist->list, 0, len);
+ if (ret_dblist)
+ *ret_dblist = dblist;
+ else
+ fs->dblist = dblist;
+ return 0;
+cleanup:
+ if (dblist)
+ ext2fs_free_mem(&dblist);
+ return retval;
+}
+
+/*
+ * Initialize a directory block list
+ */
+errcode_t ext2fs_init_dblist(ext2_filsys fs, ext2_dblist *ret_dblist)
+{
+ ext2_dblist dblist;
+ errcode_t retval;
+
+ retval = make_dblist(fs, 0, 0, 0, &dblist);
+ if (retval)
+ return retval;
+
+ dblist->sorted = 1;
+ if (ret_dblist)
+ *ret_dblist = dblist;
+ else
+ fs->dblist = dblist;
+
+ return 0;
+}
+
+/*
+ * Copy a directory block list
+ */
+errcode_t ext2fs_copy_dblist(ext2_dblist src, ext2_dblist *dest)
+{
+ ext2_dblist dblist;
+ errcode_t retval;
+
+ retval = make_dblist(src->fs, src->size, src->count, src->list,
+ &dblist);
+ if (retval)
+ return retval;
+ dblist->sorted = src->sorted;
+ *dest = dblist;
+ return 0;
+}
+
+/*
+ * Close a directory block list
+ *
+ * (moved to closefs.c)
+ */
+
+
+/*
+ * Add a directory block to the directory block list
+ */
+errcode_t ext2fs_add_dir_block2(ext2_dblist dblist, ext2_ino_t ino,
+ blk64_t blk, e2_blkcnt_t blockcnt)
+{
+ struct ext2_db_entry2 *new_entry;
+ errcode_t retval;
+ unsigned long old_size;
+
+ EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
+
+ if (dblist->count >= dblist->size) {
+ old_size = dblist->size * sizeof(struct ext2_db_entry2);
+ dblist->size += dblist->size > 200 ? dblist->size / 2 : 100;
+ retval = ext2fs_resize_mem(old_size, (size_t) dblist->size *
+ sizeof(struct ext2_db_entry2),
+ &dblist->list);
+ if (retval) {
+ dblist->size = old_size / sizeof(struct ext2_db_entry2);
+ return retval;
+ }
+ }
+ new_entry = dblist->list + ( dblist->count++);
+ new_entry->blk = blk;
+ new_entry->ino = ino;
+ new_entry->blockcnt = blockcnt;
+
+ dblist->sorted = 0;
+
+ return 0;
+}
+
+/*
+ * Change the directory block to the directory block list
+ */
+errcode_t ext2fs_set_dir_block2(ext2_dblist dblist, ext2_ino_t ino,
+ blk64_t blk, e2_blkcnt_t blockcnt)
+{
+ dgrp_t i;
+
+ EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
+
+ for (i=0; i < dblist->count; i++) {
+ if ((dblist->list[i].ino != ino) ||
+ (dblist->list[i].blockcnt != blockcnt))
+ continue;
+ dblist->list[i].blk = blk;
+ dblist->sorted = 0;
+ return 0;
+ }
+ return EXT2_ET_DB_NOT_FOUND;
+}
+
+void ext2fs_dblist_sort2(ext2_dblist dblist,
+ EXT2_QSORT_TYPE (*sortfunc)(const void *,
+ const void *))
+{
+ if (!sortfunc)
+ sortfunc = dir_block_cmp2;
+ qsort(dblist->list, (size_t) dblist->count,
+ sizeof(struct ext2_db_entry2), sortfunc);
+ dblist->sorted = 1;
+}
+
+/*
+ * This function iterates over the directory block list
+ */
+errcode_t ext2fs_dblist_iterate3(ext2_dblist dblist,
+ int (*func)(ext2_filsys fs,
+ struct ext2_db_entry2 *db_info,
+ void *priv_data),
+ unsigned long long start,
+ unsigned long long count,
+ void *priv_data)
+{
+ unsigned long long i, end;
+ int ret;
+
+ EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
+
+ end = start + count;
+ if (!dblist->sorted)
+ ext2fs_dblist_sort2(dblist, 0);
+ if (end > dblist->count)
+ end = dblist->count;
+ for (i = start; i < end; i++) {
+ ret = (*func)(dblist->fs, &dblist->list[i], priv_data);
+ if (ret & DBLIST_ABORT)
+ return 0;
+ }
+ return 0;
+}
+
+errcode_t ext2fs_dblist_iterate2(ext2_dblist dblist,
+ int (*func)(ext2_filsys fs,
+ struct ext2_db_entry2 *db_info,
+ void *priv_data),
+ void *priv_data)
+{
+ return ext2fs_dblist_iterate3(dblist, func, 0, dblist->count,
+ priv_data);
+}
+
+static EXT2_QSORT_TYPE dir_block_cmp2(const void *a, const void *b)
+{
+ const struct ext2_db_entry2 *db_a =
+ (const struct ext2_db_entry2 *) a;
+ const struct ext2_db_entry2 *db_b =
+ (const struct ext2_db_entry2 *) b;
+
+ if (db_a->blk != db_b->blk)
+ return (int) (db_a->blk - db_b->blk);
+
+ if (db_a->ino != db_b->ino)
+ return (int) (db_a->ino - db_b->ino);
+
+ return (db_a->blockcnt - db_b->blockcnt);
+}
+
+blk64_t ext2fs_dblist_count2(ext2_dblist dblist)
+{
+ return dblist->count;
+}
+
+errcode_t ext2fs_dblist_get_last2(ext2_dblist dblist,
+ struct ext2_db_entry2 **entry)
+{
+ EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
+
+ if (dblist->count == 0)
+ return EXT2_ET_DBLIST_EMPTY;
+
+ if (entry)
+ *entry = dblist->list + ( dblist->count-1);
+ return 0;
+}
+
+errcode_t ext2fs_dblist_drop_last(ext2_dblist dblist)
+{
+ EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
+
+ if (dblist->count == 0)
+ return EXT2_ET_DBLIST_EMPTY;
+
+ dblist->count--;
+ return 0;
+}
+
+/*
+ * Legacy 32-bit versions
+ */
+
+/*
+ * Add a directory block to the directory block list
+ */
+errcode_t ext2fs_add_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
+ int blockcnt)
+{
+ return ext2fs_add_dir_block2(dblist, ino, blk, blockcnt);
+}
+
+/*
+ * Change the directory block to the directory block list
+ */
+errcode_t ext2fs_set_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
+ int blockcnt)
+{
+ return ext2fs_set_dir_block2(dblist, ino, blk, blockcnt);
+}
+
+void ext2fs_dblist_sort(ext2_dblist dblist,
+ EXT2_QSORT_TYPE (*sortfunc)(const void *,
+ const void *))
+{
+ if (sortfunc) {
+ sortfunc32 = sortfunc;
+ sortfunc = dir_block_cmp;
+ } else
+ sortfunc = dir_block_cmp2;
+ qsort(dblist->list, (size_t) dblist->count,
+ sizeof(struct ext2_db_entry2), sortfunc);
+ dblist->sorted = 1;
+}
+
+/*
+ * This function iterates over the directory block list
+ */
+struct iterate_passthrough {
+ int (*func)(ext2_filsys fs,
+ struct ext2_db_entry *db_info,
+ void *priv_data);
+ void *priv_data;
+};
+
+static int passthrough_func(ext2_filsys fs,
+ struct ext2_db_entry2 *db_info,
+ void *priv_data)
+{
+ struct iterate_passthrough *p = priv_data;
+ struct ext2_db_entry db;
+ int ret;
+
+ db.ino = db_info->ino;
+ db.blk = (blk_t) db_info->blk;
+ db.blockcnt = (int) db_info->blockcnt;
+ ret = (p->func)(fs, &db, p->priv_data);
+ db_info->ino = db.ino;
+ db_info->blk = db.blk;
+ db_info->blockcnt = db.blockcnt;
+ return ret;
+}
+
+errcode_t ext2fs_dblist_iterate(ext2_dblist dblist,
+ int (*func)(ext2_filsys fs,
+ struct ext2_db_entry *db_info,
+ void *priv_data),
+ void *priv_data)
+{
+ struct iterate_passthrough pass;
+
+ EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
+ pass.func = func;
+ pass.priv_data = priv_data;
+
+ return ext2fs_dblist_iterate2(dblist, passthrough_func, &pass);
+}
+
+static EXT2_QSORT_TYPE dir_block_cmp(const void *a, const void *b)
+{
+ const struct ext2_db_entry2 *db_a =
+ (const struct ext2_db_entry2 *) a;
+ const struct ext2_db_entry2 *db_b =
+ (const struct ext2_db_entry2 *) b;
+
+ struct ext2_db_entry a32, b32;
+
+ a32.ino = db_a->ino; a32.blk = db_a->blk;
+ a32.blockcnt = db_a->blockcnt;
+
+ b32.ino = db_b->ino; b32.blk = db_b->blk;
+ b32.blockcnt = db_b->blockcnt;
+
+ return sortfunc32(&a32, &b32);
+}
+
+int ext2fs_dblist_count(ext2_dblist dblist)
+{
+ return dblist->count;
+}
+
+errcode_t ext2fs_dblist_get_last(ext2_dblist dblist,
+ struct ext2_db_entry **entry)
+{
+ static struct ext2_db_entry ret_entry;
+ struct ext2_db_entry2 *last;
+
+ EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
+
+ if (dblist->count == 0)
+ return EXT2_ET_DBLIST_EMPTY;
+
+ if (!entry)
+ return 0;
+
+ last = dblist->list + dblist->count -1;
+
+ ret_entry.ino = last->ino;
+ ret_entry.blk = last->blk;
+ ret_entry.blockcnt = last->blockcnt;
+ *entry = &ret_entry;
+
+ return 0;
+}
+
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