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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* xattr_writer_record.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "xattr_writer.h"
static const char *hexmap = "0123456789ABCDEF";
static char *to_base32(const void *input, size_t size)
{
const sqfs_u8 *in = input;
char *out, *ptr;
size_t i;
out = malloc(2 * size + 1);
if (out == NULL)
return NULL;
ptr = out;
for (i = 0; i < size; ++i) {
*(ptr++) = hexmap[ in[i] & 0x0F];
*(ptr++) = hexmap[(in[i] >> 4) & 0x0F];
}
*ptr = '\0';
return out;
}
static int compare_u64(const void *a, const void *b)
{
sqfs_u64 lhs = *((const sqfs_u64 *)a);
sqfs_u64 rhs = *((const sqfs_u64 *)b);
return (lhs < rhs ? -1 : (lhs > rhs ? 1 : 0));
}
int sqfs_xattr_writer_begin(sqfs_xattr_writer_t *xwr, sqfs_u32 flags)
{
if (flags != 0)
return SQFS_ERROR_UNSUPPORTED;
xwr->kv_start = xwr->num_pairs;
return 0;
}
int sqfs_xattr_writer_add(sqfs_xattr_writer_t *xwr, const char *key,
const void *value, size_t size)
{
size_t i, key_index, old_value_index, value_index, new_count;
sqfs_u64 kv_pair, *new;
char *value_str;
int err;
if (sqfs_get_xattr_prefix_id(key) < 0)
return SQFS_ERROR_UNSUPPORTED;
/* resolve key and value into unique, incremental IDs */
err = str_table_get_index(&xwr->keys, key, &key_index);
if (err)
return err;
value_str = to_base32(value, size);
if (value_str == NULL)
return SQFS_ERROR_ALLOC;
err = str_table_get_index(&xwr->values, value_str, &value_index);
free(value_str);
if (err)
return err;
str_table_add_ref(&xwr->values, value_index);
if (sizeof(size_t) > sizeof(sqfs_u32)) {
if (key_index > 0x0FFFFFFFFUL || value_index > 0x0FFFFFFFFUL)
return SQFS_ERROR_OVERFLOW;
}
/* bail if already have the pair, overwrite if we have the key */
kv_pair = MK_PAIR(key_index, value_index);
for (i = xwr->kv_start; i < xwr->num_pairs; ++i) {
if (xwr->kv_pairs[i] == kv_pair)
return 0;
if (GET_KEY(xwr->kv_pairs[i]) == key_index) {
old_value_index = GET_VALUE(xwr->kv_pairs[i]);
str_table_del_ref(&xwr->values, old_value_index);
xwr->kv_pairs[i] = kv_pair;
return 0;
}
}
/* append it to the list */
if (xwr->max_pairs == xwr->num_pairs) {
new_count = xwr->max_pairs * 2;
new = realloc(xwr->kv_pairs,
sizeof(xwr->kv_pairs[0]) * new_count);
if (new == NULL)
return SQFS_ERROR_ALLOC;
xwr->kv_pairs = new;
xwr->max_pairs = new_count;
}
xwr->kv_pairs[xwr->num_pairs++] = kv_pair;
return 0;
}
int sqfs_xattr_writer_end(sqfs_xattr_writer_t *xwr, sqfs_u32 *out)
{
kv_block_desc_t *blk, *blk_prev;
sqfs_u32 index;
size_t count;
int ret;
count = xwr->num_pairs - xwr->kv_start;
if (count == 0) {
*out = 0xFFFFFFFF;
return 0;
}
qsort(xwr->kv_pairs + xwr->kv_start, count,
sizeof(xwr->kv_pairs[0]), compare_u64);
blk_prev = NULL;
blk = xwr->kv_blocks;
index = 0;
while (blk != NULL) {
if (blk->count == count) {
ret = memcmp(xwr->kv_pairs + blk->start,
xwr->kv_pairs + xwr->kv_start,
sizeof(xwr->kv_pairs[0]) * count);
if (ret == 0)
break;
}
if (index == 0xFFFFFFFF)
return SQFS_ERROR_OVERFLOW;
++index;
blk_prev = blk;
blk = blk->next;
}
if (blk != NULL) {
xwr->num_pairs = xwr->kv_start;
} else {
blk = calloc(1, sizeof(*blk));
if (blk == NULL)
return SQFS_ERROR_ALLOC;
blk->start = xwr->kv_start;
blk->count = count;
if (blk_prev == NULL) {
xwr->kv_blocks = blk;
} else {
blk_prev->next = blk;
}
xwr->num_blocks += 1;
}
*out = index;
return 0;
}
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