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Bounds check elimination

This commit is contained in:
Andy Wang 2020-04-17 01:03:36 +01:00
parent 32ef6b65f6
commit 70aa04354a
1 changed files with 4 additions and 3 deletions
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7
internal/common/tls.go
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@ -19,11 +19,12 @@ const (
func AddRecordLayer(input []byte, typ byte, ver uint16) []byte { func AddRecordLayer(input []byte, typ byte, ver uint16) []byte {
msgLen := len(input) msgLen := len(input)
retLen := msgLen + recordLayerLength
var ret []byte var ret []byte
if cap(input) > msgLen+recordLayerLength { if cap(input) >= retLen {
ret = input[:msgLen+recordLayerLength] ret = input[:retLen]
} else { } else {
ret = make([]byte, msgLen+recordLayerLength) ret = make([]byte, retLen)
} }
copy(ret[recordLayerLength:], input) copy(ret[recordLayerLength:], input)
ret[0] = typ ret[0] = typ