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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* id_table.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "sqfs/id_table.h"
#include "sqfs/table.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
struct id_table_t {
uint32_t *ids;
size_t num_ids;
size_t max_ids;
};
id_table_t *id_table_create(void)
{
id_table_t *tbl = calloc(1, sizeof(*tbl));
if (tbl == NULL)
perror("Creating ID table");
return tbl;
}
void id_table_destroy(id_table_t *tbl)
{
free(tbl->ids);
free(tbl);
}
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;
}
int id_table_index_to_id(const id_table_t *tbl, uint16_t index, uint32_t *out)
{
if (index >= tbl->num_ids) {
fputs("attempted out of bounds ID table access\n", stderr);
return -1;
}
*out = tbl->ids[index];
return 0;
}
int id_table_read(id_table_t *tbl, int fd, sqfs_super_t *super,
compressor_t *cmp)
{
uint64_t upper_limit, lower_limit;
size_t i;
if (tbl->ids != NULL) {
free(tbl->ids);
tbl->num_ids = 0;
tbl->max_ids = 0;
tbl->ids = NULL;
}
if (!super->id_count || super->id_table_start >= super->bytes_used) {
fputs("ID table missing from file system\n", stderr);
return -1;
}
upper_limit = super->id_table_start;
lower_limit = super->directory_table_start;
if (super->fragment_table_start > lower_limit &&
super->fragment_table_start < upper_limit) {
lower_limit = super->fragment_table_start;
}
if (super->export_table_start > lower_limit &&
super->export_table_start < upper_limit) {
lower_limit = super->export_table_start;
}
tbl->num_ids = super->id_count;
tbl->max_ids = super->id_count;
tbl->ids = sqfs_read_table(fd, cmp, tbl->num_ids * sizeof(uint32_t),
super->id_table_start, lower_limit,
upper_limit);
if (tbl->ids == NULL)
return -1;
for (i = 0; i < tbl->num_ids; ++i)
tbl->ids[i] = le32toh(tbl->ids[i]);
return 0;
}
int id_table_write(id_table_t *tbl, int outfd, sqfs_super_t *super,
compressor_t *cmp)
{
uint64_t start;
size_t i;
int ret;
for (i = 0; i < tbl->num_ids; ++i)
tbl->ids[i] = htole32(tbl->ids[i]);
super->id_count = tbl->num_ids;
ret = sqfs_write_table(outfd, super, cmp, tbl->ids,
sizeof(tbl->ids[0]) * tbl->num_ids, &start);
super->id_table_start = start;
for (i = 0; i < tbl->num_ids; ++i)
tbl->ids[i] = le32toh(tbl->ids[i]);
return ret;
}
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