[github-348] tidy up number casting

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1902803 13f79535-47bb-0310-9956-ffa450edef68

poi-ooxml/src/main/java/org/apache/poi/xssf/binary/XSSFBParser.java

@@ -92,7 +92,7 @@ public abstract class XSSFBParser {
             b2 &= ~(1<<7); //unset highest bit (if it exists?)
             recordId = ((int)b2 << 7)+(int)b1;
         } else {
-            recordId = (int)b1;
+            recordId = b1;
         }
 
         long recordLength = 0;
@@ -102,7 +102,7 @@ public abstract class XSSFBParser {
             byte b = is.readByte();
             halt = (b >> 7 & 1) == 0; //if highest bit !=1 then continue
             b &= ~(1<<7);
-            recordLength += (int)b << (i*7); //multiply by 128^i
+            recordLength += (long) (int)b << (i*7); //multiply by 128^i
             i++;
 
         }

poi/src/main/java/org/apache/poi/hssf/record/cont/ContinuableRecordInput.java

@@ -101,8 +101,8 @@ public class ContinuableRecordInput implements LittleEndianInput {
                 ((long)b5 << 40) +
                 ((long)b4 << 32) +
                 ((long)b3 << 24) +
-                (b2 << 16) +
-                (b1 <<  8) +
+                ((long)b2 << 16) +
+                ((long)b1 <<  8) +
                 (b0));
     }
 

poi/src/main/java/org/apache/poi/poifs/crypt/ChunkedCipherInputStream.java

@@ -172,11 +172,11 @@ public abstract class ChunkedCipherInputStream extends LittleEndianInputStream {
 
     private void nextChunk() throws GeneralSecurityException, IOException {
         if (chunkSize != -1) {
-            int index = (int)(pos >> chunkBits);
+            int index = (int) (pos >> chunkBits);
             initCipherForBlock(cipher, index);
 
             if (lastIndex != index) {
-                long skipN = (index - lastIndex) << chunkBits;
+                long skipN = ((long) index - lastIndex) << chunkBits;
                 if (super.skip(skipN) < skipN) {
                     throw new EOFException("buffer underrun");
                 }