Avoid compilation failure in ARM64 (#3)

* Adding support for arm

* Dummy method for arm and arm64

* Improve error handling

* Apply review feedback

patcher.go

@@ -109,11 +109,14 @@ func applyPatch(patch *Patch) error {
 	defer patchLock.Unlock()
 	tPointer := patch.target.Pointer()
 	rPointer := getInternalPtrFromValue(*patch.redirection)
-	rPointerJumpBytes := getJumpFuncBytes(rPointer)
+	rPointerJumpBytes, err := getJumpFuncBytes(rPointer)
+	if err != nil {
+		return err
+	}
 	tPointerBytes := getMemorySliceFromPointer(tPointer, len(rPointerJumpBytes))
 	targetBytes := make([]byte, len(tPointerBytes))
 	copy(targetBytes, tPointerBytes)
-	err := copyDataToPtr(tPointer, rPointerJumpBytes)
+	err = copyDataToPtr(tPointer, rPointerJumpBytes)
 	if err != nil {
 		return err
 	}

patcher_unsupported.go

@@ -0,0 +1,15 @@
+// +build !386
+// +build !amd64
+
+package mpatch
+
+import (
+	"errors"
+	"fmt"
+	"runtime"
+)
+
+// Gets the jump function rewrite bytes
+func getJumpFuncBytes(to uintptr) ([]byte, error) {
+	return nil, errors.New(fmt.Sprintf("Unsupported architecture: %s", runtime.GOARCH))
+}

patcher_x32.go

@@ -3,13 +3,13 @@
 package mpatch
 
 // Gets the jump function rewrite bytes
-func getJumpFuncBytes(to uintptr) []byte {
+func getJumpFuncBytes(to uintptr) ([]byte, error) {
 	return []byte{
 		0xBA,
 		byte(to),
 		byte(to >> 8),
 		byte(to >> 16),
 		byte(to >> 24),
 		0xFF, 0x22,
-	}
+	}, nil
 }

patcher_x64.go

@@ -3,7 +3,7 @@
 package mpatch
 
 // Gets the jump function rewrite bytes
-func getJumpFuncBytes(to uintptr) []byte {
+func getJumpFuncBytes(to uintptr) ([]byte, error) {
 	return []byte{
 		0x48, 0xBA,
 		byte(to),
@@ -15,5 +15,5 @@ func getJumpFuncBytes(to uintptr) []byte {
 		byte(to >> 48),
 		byte(to >> 56),
 		0xFF, 0x22,
-	}
+	}, nil
 }