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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* write_table.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "meta_writer.h"
#include "highlevel.h"
#include "util.h"
#include <endian.h>
#include <stdlib.h>
#include <stdio.h>
int sqfs_write_table(int outfd, sqfs_super_t *super, compressor_t *cmp,
const void *data, size_t table_size, uint64_t *start)
{
size_t block_count, list_size, diff, blkidx = 0;
uint64_t block, *locations;
meta_writer_t *m;
uint32_t offset;
int ret = -1;
block_count = table_size / SQFS_META_BLOCK_SIZE;
if ((table_size % SQFS_META_BLOCK_SIZE) != 0)
++block_count;
locations = alloc_array(sizeof(uint64_t), block_count);
if (locations == NULL) {
perror("writing table");
return -1;
}
/* Write actual data */
m = meta_writer_create(outfd, cmp, false);
if (m == NULL)
goto out_idx;
while (table_size > 0) {
meta_writer_get_position(m, &block, &offset);
locations[blkidx++] = htole64(super->bytes_used + block);
diff = SQFS_META_BLOCK_SIZE;
if (diff > table_size)
diff = table_size;
if (meta_writer_append(m, data, diff))
goto out;
data = (const char *)data + diff;
table_size -= diff;
}
if (meta_writer_flush(m))
goto out;
meta_writer_get_position(m, &block, &offset);
super->bytes_used += block;
/* write location list */
*start = super->bytes_used;
list_size = sizeof(uint64_t) * block_count;
if (write_data("writing table locations", outfd, locations, list_size))
goto out;
super->bytes_used += list_size;
/* cleanup */
ret = 0;
out:
meta_writer_destroy(m);
out_idx:
free(locations);
return ret;
}
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