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package hotline
import (
"encoding/binary"
"io"
"slices"
)
type FileHeader struct {
Size [2]byte // Total size of FileHeader payload
Type [2]byte // 0 for file, 1 for dir
FilePath []byte // encoded file path
readOffset int // Internal offset to track read progress
}
func NewFileHeader(fileName string, isDir bool) FileHeader {
fh := FileHeader{
FilePath: EncodeFilePath(fileName),
}
if isDir {
fh.Type = [2]byte{0x00, 0x01}
}
encodedPathLen := uint16(len(fh.FilePath) + len(fh.Type))
binary.BigEndian.PutUint16(fh.Size[:], encodedPathLen)
return fh
}
func (fh *FileHeader) Read(p []byte) (int, error) {
buf := slices.Concat(
fh.Size[:],
fh.Type[:],
fh.FilePath,
)
if fh.readOffset >= len(buf) {
return 0, io.EOF // All bytes have been read
}
n := copy(p, buf[fh.readOffset:])
fh.readOffset += n
return n, nil
}
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