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archive50 parse header, impl file redirection to get link file info #31

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archive50 parse header, impl file redirection to get link file info #31

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24 changes: 23 additions & 1 deletion archive50.go
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,13 @@ const (
file5EncCheckPresent = 0x0001 // password check data is present
file5EncUseMac = 0x0002 // use MAC instead of plain checksum

// file system redirection flags
file5UnixSymlink = 0x0001
file5WindowsSymlink = 0x0002
file5WindowsJunction = 0x0003
file5HardLink = 0x0004
file5FileCopy = 0x0005

cacheSize50 = 4
maxPbkdf2Salt = 64
pwCheckSize = 8
Expand Down Expand Up @@ -250,6 +257,21 @@ func (a *archive50) parseFileEncryptionRecord(b readBuf, f *fileBlockHeader) err
return nil
}

// parseFileRedirectionRecord processes the file reddirection record from a file header
func (a *archive50) parseFileRedirectionRecord(b readBuf, f *fileBlockHeader) error {
types := b.uvarint()
if types&file5WindowsSymlink > 0 || types&file5UnixSymlink > 0 {
f.LinkType = TypeSymlink
} else if types&file5HardLink > 0 {
f.LinkType = TypeLink
}
// pass link target flags
b.uvarint()
lenName := int(b.uvarint())
f.LinkName = string(b.bytes(lenName))
return nil
}

func (a *archive50) parseFileHeader(h *blockHeader50) (*fileBlockHeader, error) {
a.checksum.sum = nil
a.checksum.key = nil
Expand Down Expand Up @@ -324,7 +346,7 @@ func (a *archive50) parseFileHeader(h *blockHeader50) (*fileBlockHeader, error)
_ = e.data.uvarint() // ignore flags field
f.Version = int(e.data.uvarint())
case 5:
// TODO: redirection
err = a.parseFileRedirectionRecord(e.data, f)
case 6:
// TODO: owner
}
Expand Down
9 changes: 9 additions & 0 deletions reader.go
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,13 @@ const (
maxPassword = 128
)

const (
// Type '0' indicates a regular file.
TypeReg = '0'
TypeLink = '1' // Hard link
TypeSymlink = '2' // Symbolic link
)

var (
errShortFile = errors.New("rardecode: decoded file too short")
errInvalidFileBlock = errors.New("rardecode: invalid file block")
Expand Down Expand Up @@ -105,6 +112,8 @@ type FileHeader struct {
CreationTime time.Time // creation time (non-zero if set)
AccessTime time.Time // access time (non-zero if set)
Version int // file version
LinkType byte //
LinkName string // link name
}

// Mode returns an os.FileMode for the file, calculated from the Attributes field.
Expand Down