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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package btrfsitem
import (
"fmt"
"git.lukeshu.com/btrfs-progs-ng/lib/binstruct"
"git.lukeshu.com/btrfs-progs-ng/lib/binstruct/binutil"
)
// key.objectid = inode number of the file
// key.offset = inode number of the parent directory
//
// Might have multiple entries if the same file has multiple hardlinks
// in the same directory.
type InodeRefs []InodeRef // INODE_REF=12
func (o *InodeRefs) UnmarshalBinary(dat []byte) (int, error) {
*o = nil
n := 0
for n < len(dat) {
var ref InodeRef
_n, err := binstruct.Unmarshal(dat[n:], &ref)
n += _n
if err != nil {
return n, err
}
*o = append(*o, ref)
}
return n, nil
}
func (o InodeRefs) MarshalBinary() ([]byte, error) {
var dat []byte
for _, ref := range o {
_dat, err := binstruct.Marshal(ref)
dat = append(dat, _dat...)
if err != nil {
return dat, err
}
}
return dat, nil
}
type InodeRef struct {
Index int64 `bin:"off=0x0, siz=0x8"`
NameLen uint16 `bin:"off=0x8, siz=0x2"` // [ignored-when-writing]
binstruct.End `bin:"off=0xa"`
Name []byte `bin:"-"`
}
func (o *InodeRef) UnmarshalBinary(dat []byte) (int, error) {
if err := binutil.NeedNBytes(dat, 0xA); err != nil {
return 0, err
}
n, err := binstruct.UnmarshalWithoutInterface(dat, o)
if err != nil {
return n, err
}
if o.NameLen > MaxNameLen {
return 0, fmt.Errorf("maximum name len is %v, but .NameLen=%v",
MaxNameLen, o.NameLen)
}
if err := binutil.NeedNBytes(dat, 0xA+int(o.NameLen)); err != nil {
return 0, err
}
dat = dat[n:]
o.Name = dat[:o.NameLen]
n += int(o.NameLen)
return n, nil
}
func (o InodeRef) MarshalBinary() ([]byte, error) {
o.NameLen = uint16(len(o.Name))
dat, err := binstruct.MarshalWithoutInterface(o)
if err != nil {
return dat, err
}
dat = append(dat, o.Name...)
return dat, nil
}
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