Integer signing functions

mysql/signing.go

@@ -0,0 +1,33 @@
+package mysql
+
+import (
+	"unsafe"
+)
+
+// SignUint8 converts uint8 into int8.
+func SignUint8(v uint8) int8 {
+	return *(*int8)(unsafe.Pointer(&v))
+}
+
+// SignUint16 converts uint16 into int16.
+func SignUint16(v uint16) int16 {
+	return *(*int16)(unsafe.Pointer(&v))
+}
+
+// SignUint24 converts 3-byte uint32 into int32.
+func SignUint24(v uint32) int32 {
+	if v&0x00800000 != 0 {
+		v |= 0xFF000000
+	}
+	return *(*int32)(unsafe.Pointer(&v))
+}
+
+// SignUint32 converts uint32 into int32.
+func SignUint32(v uint32) int32 {
+	return *(*int32)(unsafe.Pointer(&v))
+}
+
+// SignUint64 converts uint64 into int64.
+func SignUint64(v uint64) int64 {
+	return *(*int64)(unsafe.Pointer(&v))
+}