Slice creates Buffer with minimal internal byte slice.

tunabay · tunabay · commit 0a32e3e8084d · 2021-09-20T21:03:06.000+09:00
diff --git a/buffer_slice.go b/buffer_slice.go
@@ -27,7 +27,11 @@ func (buf *Buffer) Slice(start, end int) *Buffer {
 		return &Buffer{}
 	}
 	off := buf.off + start
-	return &Buffer{b: buf.b[off>>3:], nBits: end - start, off: off & 7}
+	return &Buffer{
+		b:     buf.b[off>>3 : (buf.off+end+7)>>3],
+		nBits: end - start,
+		off:   off & 7,
+	}
 }
 
 // SliceToEnd is shorthand for Slice(start, buf.Len()) and returns the subpart

Original file line number	Diff line number	Diff line change
`@@ -27,7 +27,11 @@ func (buf Buffer) Slice(start, end int) Buffer {`
`27`	`27`	`return &Buffer{}`
`28`	`28`	`}`
`29`	`29`	`off := buf.off + start`
`30`		`- return &Buffer{b: buf.b[off>>3:], nBits: end - start, off: off & 7}`
	`30`	`+ return &Buffer{`
	`31`	`+ b: buf.b[off>>3 : (buf.off+end+7)>>3],`
	`32`	`+ nBits: end - start,`
	`33`	`+ off: off & 7,`
	`34`	`+ }`
`31`	`35`	`}`
`32`	`36`
`33`	`37`	`// SliceToEnd is shorthand for Slice(start, buf.Len()) and returns the subpart`