From 0f3417eec4eabf442c29a6e83a53c1cfa2772e89 Mon Sep 17 00:00:00 2001
From: Luke Imhoff <Kronic.Deth@gmail.com>
Date: Sun, 6 Aug 2017 22:54:50 -0500
Subject: [PATCH] AtU8 UTF8 atoms chunk

Check for old Atom, if it doesn't exist, check for AtU8 chunk.
---
 src/org/elixir_lang/beam/Beam.java        | 10 +++++++++-
 src/org/elixir_lang/beam/chunk/Atoms.java | 21 ++++++++-------------
 src/org/elixir_lang/beam/chunk/Chunk.java |  1 +
 3 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/src/org/elixir_lang/beam/Beam.java b/src/org/elixir_lang/beam/Beam.java
index 90018cf50..0a7f8d867 100644
--- a/src/org/elixir_lang/beam/Beam.java
+++ b/src/org/elixir_lang/beam/Beam.java
@@ -14,12 +14,14 @@
 import java.io.ByteArrayInputStream;
 import java.io.DataInputStream;
 import java.io.IOException;
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 
 import static org.elixir_lang.beam.chunk.Chunk.TypeID.ATOM;
+import static org.elixir_lang.beam.chunk.Chunk.TypeID.ATU8;
 import static org.elixir_lang.beam.chunk.Chunk.TypeID.EXPT;
 import static org.elixir_lang.beam.chunk.Chunk.length;
 import static org.elixir_lang.beam.chunk.Chunk.typeID;
@@ -166,7 +168,13 @@ public Atoms atoms() {
         Chunk chunk = chunk(ATOM);
 
         if (chunk != null) {
-            atoms = Atoms.from(chunk);
+            atoms = Atoms.from(chunk, ATOM, Charset.forName("LATIN1"));
+        } else {
+            chunk = chunk(ATU8);
+
+            if (chunk != null) {
+                atoms = Atoms.from(chunk, ATU8, Charset.forName("UTF-8"));
+            }
         }
 
         return atoms;
diff --git a/src/org/elixir_lang/beam/chunk/Atoms.java b/src/org/elixir_lang/beam/chunk/Atoms.java
index ed6ee11c5..b48f88a45 100644
--- a/src/org/elixir_lang/beam/chunk/Atoms.java
+++ b/src/org/elixir_lang/beam/chunk/Atoms.java
@@ -4,11 +4,11 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
-import static org.elixir_lang.beam.chunk.Chunk.TypeID.ATOM;
 import static org.elixir_lang.beam.chunk.Chunk.unsignedByte;
 import static org.elixir_lang.beam.chunk.Chunk.unsignedInt;
 
@@ -18,13 +18,9 @@ public class Atoms {
      */
 
     @NotNull
-    private List<String> atomList;
+    private final List<String> atomList;
 
-    /*
-     * Constructors
-     */
-
-    public Atoms(@NotNull List<String> atomList) {
+    private Atoms(@NotNull List<String> atomList) {
         this.atomList = Collections.unmodifiableList(atomList);
     }
 
@@ -33,23 +29,23 @@ public Atoms(@NotNull List<String> atomList) {
      */
 
     @Nullable
-    public static Atoms from(@NotNull Chunk chunk) {
+    public static Atoms from(@NotNull Chunk chunk, @NotNull Chunk.TypeID typeID, @NotNull Charset charset) {
         Atoms atoms = null;
 
-        if (chunk.typeID.equals(ATOM.toString()) && chunk.data.length >= 4) {
+        if (chunk.typeID.equals(typeID.toString()) && chunk.data.length >= 4) {
             int offset = 0;
             Pair<Long, Integer> atomCountByteCount = unsignedInt(chunk.data, offset);
             long atomCount = atomCountByteCount.first;
             offset += atomCountByteCount.second;
 
-            List<String> atomList = new ArrayList<String>();
+            List<String> atomList = new ArrayList<>();
 
             for (long i = 0; i < atomCount; i++) {
                 Pair<Integer, Integer> atomLengthByteCount = unsignedByte(chunk.data[offset]);
                 int atomLength = atomLengthByteCount.first;
                 offset += atomLengthByteCount.second;
 
-                String entry = new String(chunk.data, offset, atomLength);
+                String entry = new String(chunk.data, offset, atomLength, charset);
                 offset += atomLength;
                 atomList.add(entry);
             }
@@ -65,9 +61,8 @@ public static Atoms from(@NotNull Chunk chunk) {
      */
 
     /**
-     *
      * @param index 1-based index.  1 is reserved for {#link moduleName}
-     * @return atom if
+     * @return atom if it exists
      */
     @Nullable
     public String get(int index) {
diff --git a/src/org/elixir_lang/beam/chunk/Chunk.java b/src/org/elixir_lang/beam/chunk/Chunk.java
index 66d3a13c8..b328d95d4 100644
--- a/src/org/elixir_lang/beam/chunk/Chunk.java
+++ b/src/org/elixir_lang/beam/chunk/Chunk.java
@@ -101,6 +101,7 @@ static Pair<Long, Integer> unsignedInt(@NotNull byte[] bytes, int offset) {
 
     public enum TypeID {
         ATOM("Atom"),
+        ATU8("AtU8"),
         EXPT("ExpT");
 
         private final String typeID;