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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* file_cmp.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "util/util.h"
#include "sqfs/io.h"
#include <string.h>
int check_file_range_equal(sqfs_file_t *file, void *scratch, size_t scratch_sz,
sqfs_u64 loc_a, sqfs_u64 loc_b, sqfs_u64 size)
{
sqfs_u8 *ptr_a = scratch, *ptr_b = ptr_a + scratch_sz / 2;
int ret;
while (size > 0) {
size_t diff = scratch_sz / 2;
diff = (sqfs_u64)diff > size ? size : diff;
ret = file->read_at(file, loc_a, ptr_a, diff);
if (ret != 0)
return ret;
ret = file->read_at(file, loc_b, ptr_b, diff);
if (ret != 0)
return ret;
if (memcmp(ptr_a, ptr_b, diff) != 0)
return 1;
size -= diff;
loc_a += diff;
loc_b += diff;
}
return 0;
}
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