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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* extract.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "sqfsdiff.h"
static int extract(sqfs_data_reader_t *data, const sqfs_inode_generic_t *inode,
const char *prefix, const char *path, size_t block_size)
{
char *ptr, *temp;
sqfs_ostream_t *fp;
sqfs_istream_t *in;
int ret;
temp = alloca(strlen(prefix) + strlen(path) + 2);
sprintf(temp, "%s/%s", prefix, path);
ptr = strrchr(temp, '/');
if (ptr != NULL) {
*ptr = '\0';
if (mkdir_p(temp))
return -1;
*ptr = '/';
}
ret = sqfs_ostream_open_file(&fp, temp, SQFS_FILE_OPEN_OVERWRITE);
if (ret) {
sqfs_perror(temp, NULL, ret);
return -1;
}
ret = sqfs_data_reader_create_stream(data, inode, path, &in);
if (ret) {
sqfs_drop(fp);
return -1;
}
do {
ret = sqfs_istream_splice(in, fp, block_size);
if (ret < 0)
sqfs_perror(path, "splicing data", ret);
} while (ret > 0);
sqfs_drop(in);
if (ret == 0)
ret = fp->flush(fp);
if (ret) {
sqfs_perror(fp->get_filename(fp), NULL, ret);
sqfs_drop(fp);
return -1;
}
sqfs_drop(fp);
return 0;
}
int extract_files(sqfsdiff_t *sd, const sqfs_inode_generic_t *old,
const sqfs_inode_generic_t *new,
const char *path)
{
if (old != NULL) {
if (extract(sd->sqfs_old.data, old, "old",
path, sd->sqfs_old.super.block_size))
return -1;
}
if (new != NULL) {
if (extract(sd->sqfs_new.data, new, "new",
path, sd->sqfs_new.super.block_size))
return -1;
}
return 0;
}
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