4.0初步改造

util/buffer.go

@@ -0,0 +1,30 @@
+package util
+
+type Buffer []byte
+
+func (b *Buffer) Write(a []byte) (n int, err error) {
+	*b = append(*b, a...)
+	return len(a), nil
+}
+func (b Buffer) Len() int {
+	return len(b)
+}
+func (b Buffer) Cap() int {
+	return cap(b)
+}
+func (b Buffer) SubBuf(start int, length int) Buffer {
+	return b[start : start+length]
+}
+
+func (b *Buffer) Malloc(count int) Buffer {
+	l := b.Len()
+	if l+count > b.Cap() {
+		n := make(Buffer, l+count)
+		copy(n, *b)
+		*b = n
+	}
+	return b.SubBuf(l, count)
+}
+func (b *Buffer) Reset() {
+	*b = b.SubBuf(0, 0)
+}