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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* xattr_reader.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "highlevel.h"
#include "util.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
static int restore_kv_pairs(xattr_reader_t *xr, fstree_t *fs,
tree_node_t *node)
{
size_t i, key_idx, val_idx;
sqfs_xattr_entry_t *key;
sqfs_xattr_value_t *val;
int ret;
for (i = 0; i < node->xattr->num_attr; ++i) {
key = xattr_reader_read_key(xr);
if (key == NULL)
return -1;
val = xattr_reader_read_value(xr, key);
if (val == NULL)
goto fail_key;
ret = str_table_get_index(&fs->xattr_keys,
(const char *)key->key, &key_idx);
if (ret)
goto fail_kv;
ret = str_table_get_index(&fs->xattr_values,
(const char *)val->value, &val_idx);
if (ret)
goto fail_kv;
if (sizeof(size_t) > sizeof(uint32_t)) {
if (key_idx > 0xFFFFFFFFUL) {
fputs("too many unique xattr keys\n", stderr);
goto fail_kv;
}
if (val_idx > 0xFFFFFFFFUL) {
fputs("too many unique xattr values\n", stderr);
goto fail_kv;
}
}
node->xattr->attr[i].key_index = key_idx;
node->xattr->attr[i].value_index = val_idx;
free(key);
free(val);
}
return 0;
fail_kv:
free(val);
fail_key:
free(key);
return -1;
}
int xattr_reader_restore_node(xattr_reader_t *xr, fstree_t *fs,
tree_node_t *node, uint32_t xattr)
{
sqfs_xattr_id_t desc;
tree_xattr_t *it;
for (it = fs->xattr; it != NULL; it = it->next) {
if (it->index == xattr) {
node->xattr = it;
return 0;
}
}
if (xattr_reader_get_desc(xr, xattr, &desc))
return -1;
if (desc.count == 0 || desc.size == 0)
return 0;
node->xattr = alloc_flex(sizeof(*node->xattr),
sizeof(node->xattr->attr[0]), desc.count);
if (node->xattr == NULL) {
perror("creating xattr structure");
return -1;
}
node->xattr->num_attr = desc.count;
node->xattr->max_attr = desc.count;
node->xattr->size = desc.size;
node->xattr->index = xattr;
node->xattr->owner = node;
if (xattr_reader_seek_kv(xr, &desc))
return -1;
if (restore_kv_pairs(xr, fs, node)) {
free(node->xattr);
return -1;
}
node->xattr->next = fs->xattr;
fs->xattr = node->xattr;
return 0;
}
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