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package hotline
import (
"bytes"
"encoding/binary"
"io"
"slices"
)
type FileNameWithInfo struct {
FileNameWithInfoHeader
Name []byte // File Name
readOffset int // Internal offset to track read progress
}
// FileNameWithInfoHeader contains the fixed length fields of FileNameWithInfo
type FileNameWithInfoHeader struct {
Type [4]byte // File type code
Creator [4]byte // File creator code
FileSize [4]byte // File Size in bytes
RSVD [4]byte
NameScript [2]byte // ??
NameSize [2]byte // Length of Name field
}
func (f *FileNameWithInfoHeader) nameLen() int {
return int(binary.BigEndian.Uint16(f.NameSize[:]))
}
// Read implements io.Reader for FileNameWithInfo
func (f *FileNameWithInfo) Read(p []byte) (int, error) {
buf := slices.Concat(
f.Type[:],
f.Creator[:],
f.FileSize[:],
f.RSVD[:],
f.NameScript[:],
f.NameSize[:],
f.Name,
)
if f.readOffset >= len(buf) {
return 0, io.EOF // All bytes have been read
}
n := copy(p, buf[f.readOffset:])
f.readOffset += n
return n, nil
}
func (f *FileNameWithInfo) Write(p []byte) (int, error) {
err := binary.Read(bytes.NewReader(p), binary.BigEndian, &f.FileNameWithInfoHeader)
if err != nil {
return 0, err
}
headerLen := binary.Size(f.FileNameWithInfoHeader)
f.Name = p[headerLen : headerLen+f.nameLen()]
return len(p), nil
}
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