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faster shiftNRuneBytes #305

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faster shiftNRuneBytes #305

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20 changes: 9 additions & 11 deletions tree.go
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Original file line number Diff line number Diff line change
Expand Up @@ -483,19 +483,17 @@ func (n *node) findCaseInsensitivePath(path string, fixTrailingSlash bool) (fixe
}

// Shift bytes in array by n bytes left
func shiftNRuneBytes(rb [4]byte, n int) [4]byte {
switch n {
case 0:
func shiftNRuneBytes(rb [4]byte, n int) (res [4]byte) {
if n == 0 {
return rb
case 1:
return [4]byte{rb[1], rb[2], rb[3], 0}
case 2:
return [4]byte{rb[2], rb[3]}
case 3:
return [4]byte{rb[3]}
default:
return [4]byte{}
} else if n == 1 {
res[0], res[1], res[2] = rb[1], rb[2], rb[3]
} else if n == 2 {
res[0], res[1] = rb[2], rb[3]
} else if n == 3 {
res[0] = rb[3]
}
return
}

// Recursive case-insensitive lookup function used by n.findCaseInsensitivePath
Expand Down