Initial QSfera import

Server/vendor/github.com/segmentio/kafka-go/crc32.go

@@ -0,0 +1,55 @@
+package kafka
+
+import (
+	"encoding/binary"
+	"hash/crc32"
+)
+
+type crc32Writer struct {
+	table  *crc32.Table
+	buffer [8]byte
+	crc32  uint32
+}
+
+func (w *crc32Writer) update(b []byte) {
+	w.crc32 = crc32.Update(w.crc32, w.table, b)
+}
+
+func (w *crc32Writer) writeInt8(i int8) {
+	w.buffer[0] = byte(i)
+	w.update(w.buffer[:1])
+}
+
+func (w *crc32Writer) writeInt16(i int16) {
+	binary.BigEndian.PutUint16(w.buffer[:2], uint16(i))
+	w.update(w.buffer[:2])
+}
+
+func (w *crc32Writer) writeInt32(i int32) {
+	binary.BigEndian.PutUint32(w.buffer[:4], uint32(i))
+	w.update(w.buffer[:4])
+}
+
+func (w *crc32Writer) writeInt64(i int64) {
+	binary.BigEndian.PutUint64(w.buffer[:8], uint64(i))
+	w.update(w.buffer[:8])
+}
+
+func (w *crc32Writer) writeBytes(b []byte) {
+	n := len(b)
+	if b == nil {
+		n = -1
+	}
+	w.writeInt32(int32(n))
+	w.update(b)
+}
+
+func (w *crc32Writer) Write(b []byte) (int, error) {
+	w.update(b)
+	return len(b), nil
+}
+
+func (w *crc32Writer) WriteString(s string) (int, error) {
+	w.update([]byte(s))
+	return len(s), nil
+}