git.r.bdr.sh - rbdr/mobius/blob - hotline/file_name_with_info.go

   1 package hotline
   2
   3 import (
   4         "bytes"
   5         "encoding/binary"
   6         "io"
   7         "slices"
   8 )
   9
  10 type FileNameWithInfo struct {
  11         fileNameWithInfoHeader
  12         Name []byte // File Name
  13 }
  14
  15 // fileNameWithInfoHeader contains the fixed length fields of FileNameWithInfo
  16 type fileNameWithInfoHeader struct {
  17         Type       [4]byte // File type code
  18         Creator    [4]byte // File creator code
  19         FileSize   [4]byte // File Size in bytes
  20         RSVD       [4]byte
  21         NameScript [2]byte // ??
  22         NameSize   [2]byte // Length of Name field
  23 }
  24
  25 func (f *fileNameWithInfoHeader) nameLen() int {
  26         return int(binary.BigEndian.Uint16(f.NameSize[:]))
  27 }
  28
  29 // Read implements io.Reader for FileNameWithInfo
  30 func (f *FileNameWithInfo) Read(b []byte) (int, error) {
  31         return copy(b,
  32                 slices.Concat(
  33                         f.Type[:],
  34                         f.Creator[:],
  35                         f.FileSize[:],
  36                         f.RSVD[:],
  37                         f.NameScript[:],
  38                         f.NameSize[:],
  39                         f.Name,
  40                 ),
  41         ), io.EOF
  42 }
  43
  44 func (f *FileNameWithInfo) Write(p []byte) (int, error) {
  45         err := binary.Read(bytes.NewReader(p), binary.BigEndian, &f.fileNameWithInfoHeader)
  46         if err != nil {
  47                 return 0, err
  48         }
  49         headerLen := binary.Size(f.fileNameWithInfoHeader)
  50         f.Name = p[headerLen : headerLen+f.nameLen()]
  51
  52         return len(p), nil
  53 }