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// Copyright (C) 2022-2023 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package btrfsitem
import (
"fmt"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfssum"
"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
)
// An ExtentCSum checksums regions of the logical address space.
//
// Key:
//
// key.objectid = BTRFS_EXTENT_CSUM_OBJECTID
// key.offset = laddr of checksummed region
type ExtentCSum struct { // trivial EXTENT_CSUM=128
// Checksum of each sector starting at key.offset
btrfssum.SumRun[btrfsvol.LogicalAddr]
}
func (o *ExtentCSum) UnmarshalBinary(dat []byte) (int, error) {
if o.ChecksumSize == 0 {
return 0, fmt.Errorf(".ChecksumSize must be set")
}
o.Sums = btrfssum.ShortSum(dat)
return len(dat), nil
}
func (o ExtentCSum) MarshalBinary() ([]byte, error) {
if o.ChecksumSize == 0 {
return nil, fmt.Errorf(".ChecksumSize must be set")
}
return []byte(o.Sums), nil
}
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