fix for NPE in BLOBCompressor

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@5388 6c8d7289-2bf4-0310-a012-ef5d649a1542

source/de/anomic/kelondro/kelondroBLOBCompressor.java

@@ -120,6 +120,7 @@ public class kelondroBLOBCompressor extends Thread implements kelondroBLOB {
 
     private byte[] decompress(byte[] b) {
         // use a magic in the head of the bytes to identify compression type
+        if (b == null) return null;
         if (kelondroByteArray.equals(b, gzipMagic)) {
             //System.out.print("\\"); // DEBUG
             cdr--;
@@ -194,7 +195,10 @@ public class kelondroBLOBCompressor extends Thread implements kelondroBLOB {
     public synchronized long length(byte[] key) throws IOException {
         byte[] b = buffer.get(new String(key));
         if (b != null) return b.length;
-        return decompress(this.backend.get(key)).length;
+        b = this.backend.get(key);
+        if (b == null) return 0;
+        b = decompress(b);
+        return (b == null) ? 0 : b.length;
     }
     
     private int removeFromQueues(byte[] key) throws IOException {

source/de/anomic/kelondro/kelondroByteArray.java

@@ -170,13 +170,11 @@ public class kelondroByteArray {
     }
     
     public static boolean equals(final byte[] buffer, final byte[] pattern) {
-        return equals(buffer, 0, pattern);
-    }
-    
-    public static boolean equals(final byte[] buffer, final int offset, final byte[] pattern) {
         // compares two byte arrays: true, if pattern appears completely at offset position
-        if (buffer.length < offset + pattern.length) return false;
-        for (int i = 0; i < pattern.length; i++) if (buffer[offset + i] != pattern[i]) return false;
+        if (buffer == null && pattern == null) return true;
+        if (buffer == null || pattern == null) return false;
+        if (buffer.length < pattern.length) return false;
+        for (int i = 0; i < pattern.length; i++) if (buffer[i] != pattern[i]) return false;
         return true;
     }