improve: 优化包引用

v1/XBase64.go

@@ -0,0 +1,39 @@
+package BitSrun
+
+import log "github.com/sirupsen/logrus"
+
+func getbyte(a byte) int {
+	x := int(a)
+	if x > 255 {
+		log.Fatalln("INVALID_CHARACTER_ERR: DOM Exception 5")
+	}
+	return x
+}
+
+func Base64(s []byte) string {
+	const ALPHA = "LVoJPiCN2R8G90yg+hmFHuacZ1OWMnrsSTXkYpUq/3dlbfKwv6xztjI7DeBE45QA"
+	const PADCHAR = "="
+	i := 0
+	b10 := 0
+	var x []byte
+	imax := len(s) - len(s)%3
+	if len(s) == 0 {
+		return ""
+	}
+	for i := 0; i < imax; i += 3 {
+		b10 = (getbyte(s[i]) << 16) | (getbyte(s[i+1]) << 8) | (getbyte(s[i+2]))
+		x = append(x, ALPHA[(b10>>18)])
+		x = append(x, ALPHA[((b10>>12)&63)])
+		x = append(x, ALPHA[((b10>>6)&63)])
+		x = append(x, ALPHA[(b10&63)])
+	}
+	i = imax
+	if len(s)-imax == 1 {
+		b10 = getbyte(s[i]) << 16
+		x = append(x, ALPHA[(b10>>18)], ALPHA[((b10>>12)&63)], PADCHAR[0], PADCHAR[0])
+	} else if len(s)-imax == 2 {
+		b10 = (getbyte(s[i]) << 16) | (getbyte(s[i+1]) << 8)
+		x = append(x, ALPHA[(b10>>18)], ALPHA[((b10>>12)&63)], ALPHA[((b10>>6)&63)], PADCHAR[0])
+	}
+	return string(x)
+}