diff options
Diffstat (limited to 'pkg/btrfs/btrfsitem/item_extent.go')
| -rw-r--r-- | pkg/btrfs/btrfsitem/item_extent.go | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/pkg/btrfs/btrfsitem/item_extent.go b/pkg/btrfs/btrfsitem/item_extent.go deleted file mode 100644 index ab8a4c6..0000000 --- a/pkg/btrfs/btrfsitem/item_extent.go +++ /dev/null @@ -1,165 +0,0 @@ -package btrfsitem - -import ( - "fmt" - - "lukeshu.com/btrfs-tools/pkg/binstruct" - "lukeshu.com/btrfs-tools/pkg/btrfs/internal" - "lukeshu.com/btrfs-tools/pkg/util" -) - -type Extent struct { // EXTENT_ITEM=168 - Head ExtentHeader - Info TreeBlockInfo // only if .Head.Flags.Has(EXTENT_FLAG_TREE_BLOCK) - Refs []ExtentInlineRef -} - -func (o *Extent) UnmarshalBinary(dat []byte) (int, error) { - n, err := binstruct.Unmarshal(dat, &o.Head) - if err != nil { - return n, err - } - if o.Head.Flags.Has(EXTENT_FLAG_TREE_BLOCK) { - _n, err := binstruct.Unmarshal(dat[n:], &o.Info) - n += _n - if err != nil { - return n, err - } - } - o.Refs = nil - for n < len(dat) { - var ref ExtentInlineRef - _n, err := binstruct.Unmarshal(dat[n:], &ref) - n += _n - o.Refs = append(o.Refs, ref) - if err != nil { - return n, err - } - } - return n, nil -} - -func (o Extent) MarshalBinary() ([]byte, error) { - dat, err := binstruct.Marshal(o.Head) - if err != nil { - return dat, err - } - if o.Head.Flags.Has(EXTENT_FLAG_TREE_BLOCK) { - bs, err := binstruct.Marshal(o.Info) - dat = append(dat, bs...) - if err != nil { - return dat, err - } - } - for _, ref := range o.Refs { - bs, err := binstruct.Marshal(ref) - dat = append(dat, bs...) - if err != nil { - return dat, err - } - } - return dat, nil -} - -type ExtentHeader struct { - Refs int64 `bin:"off=0, siz=8"` - Generation internal.Generation `bin:"off=8, siz=8"` - Flags ExtentFlags `bin:"off=16, siz=8"` - binstruct.End `bin:"off=24"` -} - -type TreeBlockInfo struct { - Key internal.Key `bin:"off=0, siz=0x11"` - Level uint8 `bin:"off=0x11, siz=0x8"` - binstruct.End `bin:"off=0x19"` -} - -type ExtentFlags uint64 - -const ( - EXTENT_FLAG_DATA = ExtentFlags(1 << iota) - EXTENT_FLAG_TREE_BLOCK -) - -var extentFlagNames = []string{ - "DATA", - "TREE_BLOCK", -} - -func (f ExtentFlags) Has(req ExtentFlags) bool { return f&req == req } -func (f ExtentFlags) String() string { return util.BitfieldString(f, extentFlagNames, util.HexNone) } - -type ExtentInlineRef struct { - Type Type // only 4 valid values: {TREE,SHARED}_BLOCK_REF_KEY, {EXTENT,SHARED}_DATA_REF_KEY - Offset uint64 // only when Type != EXTENT_DATA_REF_KEY - Body Item // only when Type == *_DATA_REF_KEY -} - -func (o *ExtentInlineRef) UnmarshalBinary(dat []byte) (int, error) { - o.Type = Type(dat[0]) - n := 1 - switch o.Type { - case TREE_BLOCK_REF_KEY, SHARED_BLOCK_REF_KEY: - _n, err := binstruct.Unmarshal(dat[n:], &o.Offset) - n += _n - if err != nil { - return n, err - } - case EXTENT_DATA_REF_KEY: - var dref ExtentDataRef - _n, err := binstruct.Unmarshal(dat[n:], &dref) - n += _n - o.Body = dref - if err != nil { - return n, err - } - case SHARED_DATA_REF_KEY: - _n, err := binstruct.Unmarshal(dat[n:], &o.Offset) - n += _n - if err != nil { - return n, err - } - var sref SharedDataRef - _n, err = binstruct.Unmarshal(dat[n:], &sref) - n += _n - o.Body = sref - if err != nil { - return n, err - } - default: - return n, fmt.Errorf("btrfsitem.ExtentInlineRef.UnmarshalBinary: unexpected item type %v", o.Type) - } - return n, nil -} - -func (o ExtentInlineRef) MarshalBinary() ([]byte, error) { - dat := []byte{byte(o.Type)} - switch o.Type { - case TREE_BLOCK_REF_KEY, SHARED_BLOCK_REF_KEY: - _dat, err := binstruct.Marshal(o.Offset) - dat = append(dat, _dat...) - if err != nil { - return dat, err - } - case EXTENT_DATA_REF_KEY: - _dat, err := binstruct.Marshal(o.Body) - dat = append(dat, _dat...) - if err != nil { - return dat, err - } - case SHARED_DATA_REF_KEY: - _dat, err := binstruct.Marshal(o.Offset) - dat = append(dat, _dat...) - if err != nil { - return dat, err - } - _dat, err = binstruct.Marshal(o.Body) - dat = append(dat, _dat...) - if err != nil { - return dat, err - } - default: - return dat, fmt.Errorf("btrfsitem.ExtentInlineRef.MarshalBinary: unexpected item type %v", o.Type) - } - return dat, nil -} |