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package sideband64k
import (
"fmt"
"codeberg.org/lindenii/furgit/network/protocol/pktline"
)
// AppendBand appends one side-band-64k data frame to dst.
func AppendBand(dst []byte, band Band, payload []byte) ([]byte, error) {
if !validBand(band) {
return dst, fmt.Errorf("%w: %d", ErrInvalidBand, band)
}
maxData := effectiveMaxData(DataMax)
if len(payload) > maxData {
return dst, fmt.Errorf("%w: %d > %d", ErrTooLarge, len(payload), maxData)
}
framed := make([]byte, len(payload)+1)
framed[0] = byte(band)
copy(framed[1:], payload)
return pktline.AppendData(dst, framed)
}
// AppendData appends one band-1 data frame to dst.
func AppendData(dst, payload []byte) ([]byte, error) {
return AppendBand(dst, BandData, payload)
}
// AppendProgress appends one band-2 progress frame to dst.
func AppendProgress(dst, payload []byte) ([]byte, error) {
return AppendBand(dst, BandProgress, payload)
}
// AppendError appends one band-3 error frame to dst.
func AppendError(dst, payload []byte) ([]byte, error) {
return AppendBand(dst, BandError, payload)
}
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