diff options
Diffstat (limited to 'lib/io/src/dir_entry.c')
-rw-r--r-- | lib/io/src/dir_entry.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/lib/io/src/dir_entry.c b/lib/io/src/dir_entry.c new file mode 100644 index 0000000..b7f38f5 --- /dev/null +++ b/lib/io/src/dir_entry.c @@ -0,0 +1,98 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +/* + * dir_entry.c + * + * Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at> + */ +#include "io/dir_entry.h" +#include "compat.h" + +#include <stdlib.h> +#include <string.h> + +dir_entry_t *dir_entry_create(const char *name) +{ + size_t len, name_len; + dir_entry_t *out; + + name_len = strlen(name); + if (SZ_ADD_OV(name_len, 1, &name_len)) + return NULL; + if (SZ_ADD_OV(sizeof(*out), name_len, &len)) + return NULL; + + out = calloc(1, len); + if (out == NULL) + return NULL; + + memcpy(out->name, name, name_len); + return out; +} + +dir_entry_xattr_t *dir_entry_xattr_create(const char *key, const sqfs_u8 *value, + size_t value_len) +{ + dir_entry_xattr_t *out; + size_t len, key_len; + + /* key_ley = strlen(key) + 1 */ + key_len = strlen(key); + if (SZ_ADD_OV(key_len, 1, &key_len)) + return NULL; + + /* len = key_len + value_len + 1 + sizeof(*out) */ + if (SZ_ADD_OV(key_len, value_len, &len)) + return NULL; + if (SZ_ADD_OV(len, 1, &len)) + return NULL; + if (SZ_ADD_OV(len, sizeof(*out), &len)) + return NULL; + + out = calloc(1, len); + if (out != NULL) { + out->key = out->data; + out->value = (sqfs_u8 *)out->data + key_len; + out->value_len = value_len; + + memcpy(out->key, key, key_len); + memcpy(out->value, value, value_len); + } + + return out; +} + +dir_entry_xattr_t *dir_entry_xattr_list_copy(const dir_entry_xattr_t *list) +{ + dir_entry_xattr_t *new, *copy = NULL, *copy_last = NULL; + const dir_entry_xattr_t *it; + + for (it = list; it != NULL; it = it->next) { + new = dir_entry_xattr_create(it->key, it->value, + it->value_len); + if (new == NULL) { + dir_entry_xattr_list_free(copy); + return NULL; + } + + if (copy_last == NULL) { + copy = new; + copy_last = new; + } else { + copy_last->next = new; + copy_last = new; + } + } + + return copy; +} + +void dir_entry_xattr_list_free(dir_entry_xattr_t *list) +{ + dir_entry_xattr_t *old; + + while (list != NULL) { + old = list; + list = list->next; + free(old); + } +} |