finish arm64 encode

base14_arm64.go

@@ -0,0 +1,45 @@
+//go:build arm64
+// +build arm64
+
+package base14
+
+import (
+	"encoding/binary"
+	"unsafe"
+)
+
+//go:noescape
+//go:nosplit
+func _encode(offset, outlen int, b, encd []byte) (sum uint64, valn uintptr)
+
+//go:noescape
+//go:nosplit
+func _decode(offset, outlen int, b, decd []byte)
+
+func encode(offset, outlen int, b, encd []byte) {
+	if len(b) == 7 {
+		b = append(b, 0)
+	}
+	sum, valn := _encode(offset, outlen, b, encd)
+	if offset == 0 {
+		return
+	}
+	n := valn - (uintptr)(*(*unsafe.Pointer)(unsafe.Pointer(&encd)))
+	println(sum, n)
+	var tmp [4]byte
+	binary.LittleEndian.PutUint32(tmp[:], uint32(sum))
+	copy(encd[n:], tmp[:])
+	encd[outlen-2] = '='
+	encd[outlen-1] = byte(offset)
+}
+
+func decode(offset, outlen int, b, decd []byte) {
+	/*
+		if offset != 0 && cap(b) == len(b) {
+			b = append(b, make([]byte, 8)...)
+		}
+		_decode(offset, outlen, b, decd)
+	*/
+
+	decodeGeneric(offset, outlen, b, decd)
+}