From 9881cac2dac5b4a95a8deb98f244d97993fe7643 Mon Sep 17 00:00:00 2001
From: Viktor Lofgren <vlofgren@marginalia.nu>
Date: Wed, 10 Jul 2024 23:17:30 +0200
Subject: [PATCH] (index-reader) Correctly handle negative offset values

When wordOffset(...) returns a negative value, it means the word isn't present in the index, and we should abort.
---
 .../java/nu/marginalia/index/PrioReverseIndexReader.java       | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/code/index/index-reverse/java/nu/marginalia/index/PrioReverseIndexReader.java b/code/index/index-reverse/java/nu/marginalia/index/PrioReverseIndexReader.java
index 4b6944ae..bf1214e5 100644
--- a/code/index/index-reverse/java/nu/marginalia/index/PrioReverseIndexReader.java
+++ b/code/index/index-reverse/java/nu/marginalia/index/PrioReverseIndexReader.java
@@ -81,6 +81,9 @@ public class PrioReverseIndexReader {
 
         long offset = wordOffset(termId);
 
+        if (offset < 0) // No documents
+            return 0;
+
         ByteBuffer buffer = ByteBuffer.allocate(4);
         try {
             documentsChannel.read(buffer, offset);