From ddc1a2570aa619135e240ddc05f634b48c2e4d28 Mon Sep 17 00:00:00 2001
From: q191201771 <191201771@qq.com>
Date: Wed, 22 Jun 2022 21:42:49 +0800
Subject: [PATCH] =?UTF-8?q?[opt]=20nazabytes::Buffer:=20(1)=20NewBuffer?=
 =?UTF-8?q?=E7=9A=84initCap=E5=8F=82=E6=95=B0=E6=94=AF=E6=8C=81=E7=94=A80?=
 =?UTF-8?q?=E5=88=9D=E5=A7=8B=E5=8C=96=20(2)=20Grow=E5=87=BD=E6=95=B0?=
 =?UTF-8?q?=E6=89=A9=E5=AE=B9=E5=89=8D=E7=9A=84=E5=A4=A7=E5=B0=8F=E5=A6=82?=
 =?UTF-8?q?=E6=9E=9C0=E5=88=99=E4=B8=8D=E6=89=93=E5=8D=B0debug=E6=97=A5?=
 =?UTF-8?q?=E5=BF=97=20(3)=20=E5=A2=9E=E5=8A=A0ResetAndFree=E5=87=BD?=
 =?UTF-8?q?=E6=95=B0=EF=BC=8C=E9=87=8D=E7=BD=AE=E5=B9=B6=E4=B8=8D=E5=86=8D?=
 =?UTF-8?q?=E6=8C=81=E6=9C=89=E5=BA=95=E5=B1=82=E5=86=85=E5=AD=98=E5=9D=97?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 pkg/nazabytes/buffer.go | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/pkg/nazabytes/buffer.go b/pkg/nazabytes/buffer.go
index 634f42e..e3a04be 100644
--- a/pkg/nazabytes/buffer.go
+++ b/pkg/nazabytes/buffer.go
@@ -63,9 +63,11 @@ type Buffer struct {
 }
 
 func NewBuffer(initCap int) *Buffer {
-	return &Buffer{
-		core: make([]byte, initCap, initCap),
+	b := &Buffer{}
+	if initCap > 0 {
+		b.core = make([]byte, initCap, initCap)
 	}
+	return b
 }
 
 // NewBufferRefBytes
@@ -144,7 +146,9 @@ func (b *Buffer) Grow(n int) {
 	// 扩容后总共需要的大小
 	needed := b.Len() + n
 
-	nazalog.Debugf("[%p] Buffer::Grow. realloc, this round need=%d, copy=%d, cap=(%d -> %d)", b, n, b.Len(), b.Cap(), needed)
+	if len(b.core) != 0 {
+		nazalog.Debugf("[%p] Buffer::Grow. realloc, this round need=%d, copy=%d, cap=(%d -> %d)", b, n, b.Len(), b.Cap(), needed)
+	}
 	core := make([]byte, needed, needed)
 	copy(core, b.core[b.rpos:b.wpos])
 	b.core = core
@@ -230,15 +234,21 @@ func (b *Buffer) Truncate(n int) {
 	b.resetIfEmpty()
 }
 
-// Reset 重置
-//
-// 注意，并不会释放内存块
+// Reset 重置。注意，并不会释放内存块，可复用
 //
 func (b *Buffer) Reset() {
 	b.rpos = 0
 	b.wpos = 0
 }
 
+// ResetAndFree 重置并不再持有底层内存块
+//
+func (b *Buffer) ResetAndFree() {
+	b.core = nil
+	b.rpos = 0
+	b.wpos = 0
+}
+
 // ---------------------------------------------------------------------------------------------------------------------
 
 // Len Buffer中还没有读的数据的长度