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|
package git
import (
"bufio"
"fmt"
"io"
"strconv"
"strings"
)
type PacketReader struct {
reader *bufio.Reader
}
func NewPacketReader(r io.Reader) *PacketReader {
return &PacketReader{
reader: bufio.NewReader(r),
}
}
func (pr *PacketReader) ReadPacket() ([]byte, error) {
// Read the 4-byte length prefix
lengthBytes := make([]byte, 4)
_, err := io.ReadFull(pr.reader, lengthBytes)
if err != nil {
return nil, err
}
lengthStr := string(lengthBytes)
if lengthStr == "0000" {
return nil, nil // Flush packet
}
length, err := strconv.ParseInt(lengthStr, 16, 32)
if err != nil {
return nil, fmt.Errorf("invalid packet length: %s", lengthStr)
}
if length < 4 {
return nil, fmt.Errorf("packet length too short: %d", length)
}
// Read the packet data (length includes the 4-byte prefix)
data := make([]byte, length-4)
_, err = io.ReadFull(pr.reader, data)
if err != nil {
return nil, err
}
return data, nil
}
type PacketWriter struct {
writer io.Writer
}
func NewPacketWriter(w io.Writer) *PacketWriter {
return &PacketWriter{writer: w}
}
func (pw *PacketWriter) WritePacket(data []byte) error {
length := len(data) + 4
_, err := fmt.Fprintf(pw.writer, "%04x%s", length, data)
return err
}
func (pw *PacketWriter) WriteFlush() error {
_, err := pw.writer.Write([]byte("0000"))
return err
}
type UploadPackRequest struct {
Wants []string
Haves []string
}
func ParseUploadPackRequest(r io.Reader) (*UploadPackRequest, error) {
pr := NewPacketReader(r)
req := &UploadPackRequest{}
for {
packet, err := pr.ReadPacket()
if err != nil {
return nil, err
}
if packet == nil {
break // Flush packet
}
line := strings.TrimSpace(string(packet))
if strings.HasPrefix(line, "want ") {
sha := strings.Fields(line)[1]
req.Wants = append(req.Wants, sha)
} else if strings.HasPrefix(line, "have ") {
sha := strings.Fields(line)[1]
req.Haves = append(req.Haves, sha)
}
}
return req, nil
}
|
