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package sideband64k
import (
"fmt"
"codeberg.org/lindenii/furgit/common/iowrap"
"codeberg.org/lindenii/furgit/network/protocol/pktline"
)
// Encoder writes side-band-64k frames to a flush-capable output transport.
//
// It writes exactly one frame per method call and does not auto-chunk data.
type Encoder struct {
enc *pktline.Encoder
maxData int
}
// NewEncoder creates an encoder over w.
//
// Labels: Deps-Borrowed.
func NewEncoder(w iowrap.WriteFlusher) *Encoder {
return &Encoder{
enc: pktline.NewEncoder(w),
maxData: DataMax,
}
}
// SetMaxData sets the maximum payload size accepted by WriteBand.
//
// Non-positive n resets to DataMax.
func (e *Encoder) SetMaxData(n int) {
if n <= 0 {
e.maxData = DataMax
return
}
e.maxData = n
}
// WriteBand writes one side-band-64k data frame for the given band.
func (e *Encoder) WriteBand(band Band, p []byte) error {
if !validBand(band) {
return fmt.Errorf("%w: %d", ErrInvalidBand, band)
}
maxData := e.effectiveMaxData()
if len(p) > maxData {
return fmt.Errorf("%w: %d > %d", ErrTooLarge, len(p), maxData)
}
framed := make([]byte, len(p)+1)
framed[0] = byte(band)
copy(framed[1:], p)
return e.enc.WriteData(framed)
}
// WriteData writes one band-1 data frame.
func (e *Encoder) WriteData(p []byte) error {
return e.WriteBand(BandData, p)
}
// WriteProgress writes one band-2 progress frame.
func (e *Encoder) WriteProgress(p []byte) error {
return e.WriteBand(BandProgress, p)
}
// WriteError writes one band-3 error frame.
func (e *Encoder) WriteError(p []byte) error {
return e.WriteBand(BandError, p)
}
// WriteFlushPacket writes control frame 0000 (flush-pkt).
func (e *Encoder) WriteFlushPacket() error {
return e.enc.WriteFlushPacket()
}
// WriteDelimPacket writes control frame 0001 (delim-pkt).
func (e *Encoder) WriteDelimPacket() error {
return e.enc.WriteDelimPacket()
}
// WriteResponseEndPacket writes control frame 0002 (response-end-pkt).
func (e *Encoder) WriteResponseEndPacket() error {
return e.enc.WriteResponseEndPacket()
}
// Flush flushes buffered output in the underlying transport.
func (e *Encoder) Flush() error {
return e.enc.Flush()
}
// WriteFlushPacketAndFlush writes a flush-pkt (0000) then flushes transport I/O.
func (e *Encoder) WriteFlushPacketAndFlush() error {
return e.enc.WriteFlushPacketAndFlush()
}
func (e *Encoder) effectiveMaxData() int {
return effectiveMaxData(e.maxData)
}
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