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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* sqfs_reader.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "highlevel.h"
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
int sqfs_reader_open(sqfs_reader_t *rd, const char *filename, int rdtree_flags)
{
memset(rd, 0, sizeof(*rd));
rd->sqfsfd = open(filename, O_RDONLY);
if (rd->sqfsfd < 0) {
perror(filename);
return -1;
}
if (sqfs_super_read(&rd->super, rd->sqfsfd))
goto fail_fd;
if (!compressor_exists(rd->super.compression_id)) {
fprintf(stderr, "%s: unknown compressor used.\n", filename);
goto fail_fd;
}
rd->cmp = compressor_create(rd->super.compression_id, false,
rd->super.block_size, NULL);
if (rd->cmp == NULL)
goto fail_fd;
if (rd->super.flags & SQFS_FLAG_COMPRESSOR_OPTIONS) {
if (rd->cmp->read_options(rd->cmp, rd->sqfsfd))
goto fail_cmp;
}
if (deserialize_fstree(&rd->fs, &rd->super, rd->cmp, rd->sqfsfd,
rdtree_flags)) {
goto fail_cmp;
}
fstree_gen_file_list(&rd->fs);
rd->data = data_reader_create(rd->sqfsfd, &rd->super, rd->cmp);
if (rd->data == NULL)
goto fail_fs;
return 0;
fail_fs:
fstree_cleanup(&rd->fs);
fail_cmp:
rd->cmp->destroy(rd->cmp);
fail_fd:
close(rd->sqfsfd);
memset(rd, 0, sizeof(*rd));
return -1;
}
void sqfs_reader_close(sqfs_reader_t *rd)
{
data_reader_destroy(rd->data);
fstree_cleanup(&rd->fs);
rd->cmp->destroy(rd->cmp);
close(rd->sqfsfd);
memset(rd, 0, sizeof(*rd));
}
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