[parser]handle the condition when no data provided

wkgcass · Jun 16, 2024 · 9ca9172 · 9ca9172
1 parent 076b754
commit 9ca9172
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/base/src/main/java/io/vproxy/base/util/codec/AbstractParser.java b/base/src/main/java/io/vproxy/base/util/codec/AbstractParser.java
@@ -20,6 +20,10 @@ protected AbstractParser(Set<Integer> terminateStates) {
     }
 
     public int feed(RingBuffer buffer) {
+        if (buffer.used() == 0) {
+            // nothing provided
+            return -1;
+        }
         while (buffer.used() != 0) {
             chnl.reset();
             buffer.writeTo(chnl);
@@ -42,6 +46,10 @@ public int feed(RingBuffer buffer) {
     }
 
     public int feed(ByteArrayChannel chnl) {
+        if (chnl.used() == 0) {
+            // nothing provided
+            return -1;
+        }
         while (chnl.used() != 0) {
             byte b = chnl.read();
             state = doSwitch(b);