Initial QSfera import

Server/vendor/github.com/segmentio/asm/base64/base64_arm64.go

@@ -0,0 +1,42 @@
+//go:build arm64 && !purego
+// +build arm64,!purego
+
+package base64
+
+import (
+	"encoding/base64"
+)
+
+const (
+	encLutSize   = 16
+	decLutSize   = 2
+	minEncodeLen = 16 * 3
+	minDecodeLen = 8 * 4
+)
+
+func newEncoding(encoder string) *Encoding {
+	e := &Encoding{base: base64.NewEncoding(encoder)}
+	e.enableEncodeARM64(encoder)
+	e.enableDecodeARM64(encoder)
+	return e
+}
+
+func (e *Encoding) enableEncodeARM64(encoder string) {
+	c62, c63 := int8(encoder[62]), int8(encoder[63])
+	tab := [encLutSize]int8{
+		'a' - 26, '0' - 52, '0' - 52, '0' - 52, '0' - 52, '0' - 52, '0' - 52, '0' - 52,
+		'0' - 52, '0' - 52, '0' - 52, c62 - 62, c63 - 63, 'A', 0, 0,
+	}
+
+	e.enc = encodeARM64
+	e.enclut = tab
+}
+
+func (e *Encoding) enableDecodeARM64(encoder string) {
+	if encoder == encodeStd {
+		e.dec = decodeStdARM64
+	} else {
+		e.dec = decodeARM64
+	}
+	e.declut = [decLutSize]int8{int8(encoder[62]), int8(encoder[63])}
+}