diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Makemodule.am | 1 | ||||
| -rw-r--r-- | lib/sqfs/id_table.c | 52 |
2 files changed, 53 insertions, 0 deletions
diff --git a/lib/Makemodule.am b/lib/Makemodule.am index 86f1766..b12367d 100644 --- a/lib/Makemodule.am +++ b/lib/Makemodule.am @@ -8,6 +8,7 @@ libcompress_a_CPPFLAGS = $(AM_CPPFLAGS) libsquashfs_a_SOURCES = include/meta_writer.h include/squashfs.h libsquashfs_a_SOURCES += lib/sqfs/meta_writer.c lib/sqfs/super.c +libsquashfs_a_SOURCES += lib/sqfs/id_table.c include/id_table.h libutil_a_SOURCES = lib/util/canonicalize_name.c lib/util/write_retry.c libutil_a_SOURCES += lib/util/read_retry.c include/util.h diff --git a/lib/sqfs/id_table.c b/lib/sqfs/id_table.c new file mode 100644 index 0000000..cd31360 --- /dev/null +++ b/lib/sqfs/id_table.c @@ -0,0 +1,52 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +#include "id_table.h" + +#include <stdlib.h> +#include <string.h> +#include <stdio.h> + +int id_table_init(id_table_t *tbl) +{ + memset(tbl, 0, sizeof(*tbl)); + return 0; +} + +void id_table_cleanup(id_table_t *tbl) +{ + free(tbl->ids); +} + +int id_table_id_to_index(id_table_t *tbl, uint32_t id, uint16_t *out) +{ + size_t i, sz; + void *ptr; + + for (i = 0; i < tbl->num_ids; ++i) { + if (tbl->ids[i] == id) { + *out = i; + return 0; + } + } + + if (tbl->num_ids == 0x10000) { + fputs("Too many unique UIDs/GIDs (more than 64k)!\n", stderr); + return -1; + } + + if (tbl->num_ids == tbl->max_ids) { + sz = (tbl->max_ids ? tbl->max_ids * 2 : 16); + ptr = realloc(tbl->ids, sizeof(tbl->ids[0]) * sz); + + if (ptr == NULL) { + perror("growing ID table"); + return -1; + } + + tbl->ids = ptr; + tbl->max_ids = sz; + } + + *out = tbl->num_ids; + tbl->ids[tbl->num_ids++] = id; + return 0; +} |