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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* id_table.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include "sqfs/id_table.h"
#include "sqfs/super.h"
#include "sqfs/table.h"
#include "sqfs/error.h"
#include "compat.h"
#include <stdlib.h>
#include <string.h>
struct sqfs_id_table_t {
sqfs_object_t base;
sqfs_u32 *ids;
size_t num_ids;
size_t max_ids;
};
static void id_table_destroy(sqfs_object_t *obj)
{
sqfs_id_table_t *tbl = (sqfs_id_table_t *)obj;
free(tbl->ids);
free(tbl);
}
static sqfs_object_t *id_table_copy(const sqfs_object_t *obj)
{
const sqfs_id_table_t *tbl = (const sqfs_id_table_t *)obj;
sqfs_id_table_t *copy;
copy = malloc(sizeof(*copy));
if (copy == NULL)
return NULL;
memcpy(copy, tbl, sizeof(*tbl));
copy->num_ids = tbl->num_ids;
copy->max_ids = tbl->num_ids;
copy->ids = malloc(tbl->num_ids * sizeof(tbl->ids[0]));
if (copy->ids == NULL) {
free(copy);
return NULL;
}
memcpy(copy->ids, tbl->ids, tbl->num_ids * sizeof(tbl->ids[0]));
return (sqfs_object_t *)copy;
}
sqfs_id_table_t *sqfs_id_table_create(sqfs_u32 flags)
{
sqfs_id_table_t *tbl;
if (flags != 0)
return NULL;
tbl = calloc(1, sizeof(sqfs_id_table_t));
if (tbl != NULL) {
((sqfs_object_t *)tbl)->destroy = id_table_destroy;
((sqfs_object_t *)tbl)->copy = id_table_copy;
}
return tbl;
}
int sqfs_id_table_id_to_index(sqfs_id_table_t *tbl, sqfs_u32 id, sqfs_u16 *out)
{
sqfs_u32 *ptr;
size_t i, sz;
for (i = 0; i < tbl->num_ids; ++i) {
if (tbl->ids[i] == id) {
*out = i;
return 0;
}
}
if (tbl->num_ids == 0x10000)
return SQFS_ERROR_OVERFLOW;
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)
return SQFS_ERROR_ALLOC;
tbl->ids = ptr;
tbl->max_ids = sz;
}
*out = tbl->num_ids;
tbl->ids[tbl->num_ids++] = id;
return 0;
}
int sqfs_id_table_index_to_id(const sqfs_id_table_t *tbl, sqfs_u16 index,
sqfs_u32 *out)
{
if (index >= tbl->num_ids)
return SQFS_ERROR_OUT_OF_BOUNDS;
*out = tbl->ids[index];
return 0;
}
int sqfs_id_table_read(sqfs_id_table_t *tbl, sqfs_file_t *file,
const sqfs_super_t *super, sqfs_compressor_t *cmp)
{
sqfs_u64 upper_limit, lower_limit;
void *raw_ids;
size_t i;
int ret;
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)
return SQFS_ERROR_CORRUPTED;
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;
ret = sqfs_read_table(file, cmp, tbl->num_ids * sizeof(sqfs_u32),
super->id_table_start, lower_limit,
upper_limit, &raw_ids);
if (ret)
return ret;
tbl->ids = raw_ids;
for (i = 0; i < tbl->num_ids; ++i)
tbl->ids[i] = le32toh(tbl->ids[i]);
return 0;
}
int sqfs_id_table_write(sqfs_id_table_t *tbl, sqfs_file_t *file,
sqfs_super_t *super, sqfs_compressor_t *cmp)
{
sqfs_u64 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(file, 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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