From 1d7b97574341dc2db0cca1c106256d5f7ef280b8 Mon Sep 17 00:00:00 2001
From: Manuel Carmona <manu.carmona90@gmail.com>
Date: Thu, 7 Sep 2017 14:17:56 +0200
Subject: [PATCH] fix getLanguage when arguments are null

---
 .../main/java/tech/sourced/enry/GoUtils.java  | 22 +++++++++++++++----
 .../test/java/tech/sourced/enry/EnryTest.java | 11 ++++++++++
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/java/src/main/java/tech/sourced/enry/GoUtils.java b/java/src/main/java/tech/sourced/enry/GoUtils.java
index c845841c..3deb6f44 100644
--- a/java/src/main/java/tech/sourced/enry/GoUtils.java
+++ b/java/src/main/java/tech/sourced/enry/GoUtils.java
@@ -15,12 +15,19 @@ static GoString.ByValue toGoString(String str) {
             bytes = str.getBytes("utf-8");
         } catch (UnsupportedEncodingException e) {
             bytes = str.getBytes();
+        } catch (NullPointerException e) {
+            bytes = null;
+        }
+
+        int length = 0;
+        Pointer ptr = null;
+        if (bytes != null) {
+            length = bytes.length;
+            ptr = ptrFromBytes(bytes);
         }
 
         GoString.ByValue val = new GoString.ByValue();
-        val.n = bytes.length;
-        Pointer ptr = new Memory(bytes.length);
-        ptr.write(0, bytes, 0, bytes.length);
+        val.n = length;
         val.p = ptr;
         return val;
     }
@@ -49,7 +56,14 @@ static String[] toJavaStringArray(GoSlice slice) {
     }
 
     static GoSlice.ByValue toGoByteSlice(byte[] bytes) {
-        return sliceFromPtr(bytes.length, ptrFromBytes(bytes));
+        int length = 0;
+        Pointer ptr = null;
+        if (bytes != null) {
+            length = bytes.length;
+            ptr = ptrFromBytes(bytes);
+        }
+
+        return sliceFromPtr(length, ptr);
     }
 
     static GoSlice.ByValue sliceFromPtr(int len, Pointer ptr) {
diff --git a/java/src/test/java/tech/sourced/enry/EnryTest.java b/java/src/test/java/tech/sourced/enry/EnryTest.java
index 69f142e7..0b599c58 100644
--- a/java/src/test/java/tech/sourced/enry/EnryTest.java
+++ b/java/src/test/java/tech/sourced/enry/EnryTest.java
@@ -18,6 +18,17 @@ public void getLanguage() {
         assertEquals("PHP", Enry.getLanguage("foobar.php", code.getBytes()));
     }
 
+    @Test
+    public void getLanguageWithNullContent() {
+        assertEquals("Python", Enry.getLanguage("foo.py",  null));
+    }
+
+    @Test
+    public void getLanguageWithNullFilename() {
+        byte[] content = "#!/usr/bin/env python".getBytes();
+        assertEquals("Python", Enry.getLanguage(null, content));
+    }
+
     @Test
     public void getLanguageByContent() {
         String code = "<?php $foo = bar();";