optimize data reset (#4)

* optimize data reset

* optimize data reset

Author: markus621

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [ '1.22.11' ]
+        go: [ '1.23.8' ]
     steps:
       - uses: actions/checkout@v3
 

.github/workflows/codeql.yml

@@ -1,6 +1,6 @@
 
 run:
-  go: "1.22.11"
+  go: "1.23.8"
   concurrency: 4
   timeout: 5m
   tests: false
@@ -205,7 +205,6 @@ linters:
     - nilerr
     - errorlint
     - bodyclose
-    - exportloopref
     - gosec
     - lll
   fast: false

.golangci.yml

@@ -31,10 +31,12 @@ func NewBuffer(size int) *Buffer {
 }
 
 func (v *Buffer) Reset() {
-	for i := 0; i < v.Size(); i++ {
-		v.buf[i] = 0
+	l := len(v.buf)
+	if l > 5e6 {
+		v.buf = v.buf[:0:5e6]
+	} else {
+		v.buf = v.buf[:0]
 	}
-	v.buf = v.buf[:0]
 	v.pos = 0
 }
 
@@ -151,12 +153,12 @@ func (v *Buffer) WriteAt(b []byte, off int64) (int, error) {
 		off = 0
 	}
 
-	if len(b)+int(off) > v.Size() {
-		v.buf = append(v.buf[:off], b...)
-	} else {
-		copy(v.buf[off:], b[:])
+	if add := len(b) + int(off) - v.Size(); add > 0 {
+		v.buf = append(v.buf, make([]byte, add)...)
 	}
 
+	copy(v.buf[off:], b[:])
+
 	return len(b), nil
 }
 

data/buffer.go

@@ -1,6 +1,6 @@
 module go.osspkg.com/ioutils
 
-go 1.22.11
+go 1.23.8
 
 require (
 	go.osspkg.com/casecheck v0.3.0