From 01ef8bf9ff74e224af0935b4e8f7aebad415d7f3 Mon Sep 17 00:00:00 2001
From: Paulo Costa <me@paulo.costa.nom.br>
Date: Mon, 11 May 2020 16:48:42 -0300
Subject: [PATCH] Don't crash with a buffer underflow when packageCount == 0

---
 .../apk/parser/parser/ResourceTableParser.java       | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/main/java/net/dongliu/apk/parser/parser/ResourceTableParser.java b/src/main/java/net/dongliu/apk/parser/parser/ResourceTableParser.java
index a30d3e0..70bc2a9 100644
--- a/src/main/java/net/dongliu/apk/parser/parser/ResourceTableParser.java
+++ b/src/main/java/net/dongliu/apk/parser/parser/ResourceTableParser.java
@@ -57,11 +57,13 @@ public void parse() {
         resourceTable = new ResourceTable();
         resourceTable.setStringPool(stringPool);
 
-        PackageHeader packageHeader = (PackageHeader) readChunkHeader();
-        for (int i = 0; i < resourceTableHeader.getPackageCount(); i++) {
-            Pair<ResourcePackage, PackageHeader> pair = readPackage(packageHeader);
-            resourceTable.addPackage(pair.getLeft());
-            packageHeader = pair.getRight();
+        if (resourceTableHeader.getPackageCount() != 0) {
+            PackageHeader packageHeader = (PackageHeader) readChunkHeader();
+            for (int i = 0; i < resourceTableHeader.getPackageCount(); i++) {
+                Pair<ResourcePackage, PackageHeader> pair = readPackage(packageHeader);
+                resourceTable.addPackage(pair.getLeft());
+                packageHeader = pair.getRight();
+            }
         }
     }