diff options
Diffstat (limited to 'cryptfs/file_header.go')
-rw-r--r-- | cryptfs/file_header.go | 56 |
1 files changed, 0 insertions, 56 deletions
diff --git a/cryptfs/file_header.go b/cryptfs/file_header.go deleted file mode 100644 index fe4ac56..0000000 --- a/cryptfs/file_header.go +++ /dev/null @@ -1,56 +0,0 @@ -package cryptfs - -// Per-file header -// -// Format: [ "Version" uint16 big endian ] [ "Id" 16 random bytes ] - -import ( - "encoding/binary" - "fmt" -) - -const ( - HEADER_CURRENT_VERSION = 2 // Current on-disk-format version - HEADER_VERSION_LEN = 2 // uint16 - HEADER_ID_LEN = 16 // 128 bit random file id - HEADER_LEN = HEADER_VERSION_LEN + HEADER_ID_LEN // Total header length -) - -type FileHeader struct { - Version uint16 - Id []byte -} - -// Pack - serialize fileHeader object -func (h *FileHeader) Pack() []byte { - if len(h.Id) != HEADER_ID_LEN || h.Version != HEADER_CURRENT_VERSION { - panic("FileHeader object not properly initialized") - } - buf := make([]byte, HEADER_LEN) - binary.BigEndian.PutUint16(buf[0:HEADER_VERSION_LEN], h.Version) - copy(buf[HEADER_VERSION_LEN:], h.Id) - return buf - -} - -// ParseHeader - parse "buf" into fileHeader object -func ParseHeader(buf []byte) (*FileHeader, error) { - if len(buf) != HEADER_LEN { - return nil, fmt.Errorf("ParseHeader: invalid length: got %d, want %d", len(buf), HEADER_LEN) - } - var h FileHeader - h.Version = binary.BigEndian.Uint16(buf[0:HEADER_VERSION_LEN]) - if h.Version != HEADER_CURRENT_VERSION { - return nil, fmt.Errorf("ParseHeader: invalid version: got %d, want %d", h.Version, HEADER_CURRENT_VERSION) - } - h.Id = buf[HEADER_VERSION_LEN:] - return &h, nil -} - -// RandomHeader - create new fileHeader object with random Id -func RandomHeader() *FileHeader { - var h FileHeader - h.Version = HEADER_CURRENT_VERSION - h.Id = RandBytes(HEADER_ID_LEN) - return &h -} |