Open up xssfb to simplify client usage/modifications.

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

@@ -40,7 +40,7 @@ class XSSFBCellHeader {
      * @param cell cell buffer to update
      */
     public static void parse(byte[] data, int offset,  int currentRow, XSSFBCellHeader cell) {
-        int colNum = XSSFBUtils.castToInt(LittleEndian.getUInt(data, offset)); offset += LittleEndianConsts.INT_SIZE;
+        int colNum = Math.toIntExact(LittleEndian.getUInt(data, offset)); offset += LittleEndianConsts.INT_SIZE;
         int styleIdx = XSSFBUtils.get24BitInt(data, offset); offset += 3;
         //TODO: range checking
         boolean showPhonetic = false;//TODO: fill this out

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

@@ -23,37 +23,49 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 import org.apache.poi.util.LittleEndianConsts;
 
 /**
- * @since 3.16-beta3
+ * @since 6.0.0
  */
 @Internal
-class XSSFBCellRange {
+public class XSSFBCellRange {
+
     //TODO: Convert this to generate an AreaReference
+    public static final int length = 4 * LittleEndianConsts.INT_SIZE;
+
+    private int firstRow;
+    private int lastRow;
+    private int firstCol;
+    private int lastCol;
+
+    public XSSFBCellRange(int firstRow, int lastRow, int firstCol, int lastCol) {
+        this.firstRow = firstRow;
+        this.lastRow = lastRow;
+        this.firstCol = firstCol;
+        this.lastCol = lastCol;
+    }
+
+    XSSFBCellRange() {
+    }
 
-    public static final int length = 4* LittleEndianConsts.INT_SIZE;
     /**
      * Parses an RfX cell range from the data starting at the offset.
-     * This performs no range checking.
      * @param data raw bytes
      * @param offset offset at which to start reading from data
-     * @param cellRange to overwrite. If null, a new cellRange will be created.
-     * @return a mutable cell range.
+     * @param cellRange to update. If null, a new cellRange will be created.
+     * @return the updated or new cell range
      */
     public static XSSFBCellRange parse(byte[] data, int offset, XSSFBCellRange cellRange) {
         if (cellRange == null) {
             cellRange = new XSSFBCellRange();
         }
-        cellRange.firstRow = XSSFBUtils.castToInt(LittleEndian.getUInt(data, offset)); offset += LittleEndianConsts.INT_SIZE;
-        cellRange.lastRow = XSSFBUtils.castToInt(LittleEndian.getUInt(data, offset)); offset += LittleEndianConsts.INT_SIZE;
-        cellRange.firstCol = XSSFBUtils.castToInt(LittleEndian.getUInt(data, offset)); offset += LittleEndianConsts.INT_SIZE;
-        cellRange.lastCol = XSSFBUtils.castToInt(LittleEndian.getUInt(data, offset));
-
+        cellRange.firstRow = Math.toIntExact(LittleEndian.getUInt(data, offset)); offset += LittleEndianConsts.INT_SIZE;
+        cellRange.lastRow = Math.toIntExact(LittleEndian.getUInt(data, offset)); offset += LittleEndianConsts.INT_SIZE;
+        cellRange.firstCol = Math.toIntExact(LittleEndian.getUInt(data, offset)); offset += LittleEndianConsts.INT_SIZE;
+        cellRange.lastCol = Math.toIntExact(LittleEndian.getUInt(data, offset));
         return cellRange;
     }
 
-    int firstRow;
-    int lastRow;
-    int firstCol;
-    int lastCol;
-
-
+    public int getFirstRow() { return firstRow; }
+    public int getLastRow() { return lastRow; }
+    public int getFirstCol() { return firstCol; }
+    public int getLastCol() { return lastCol; }
 }

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

@@ -61,11 +61,10 @@ public void handleRecord(int id, byte[] data) throws XSSFBParseException {
         switch (recordType) {
             case BrtBeginComment:
                 int offset = 0;
-                authorId = XSSFBUtils.castToInt(LittleEndian.getUInt(data)); offset += LittleEndianConsts.INT_SIZE;
+                authorId = Math.toIntExact(LittleEndian.getUInt(data)); offset += LittleEndianConsts.INT_SIZE;
                 cellRange = XSSFBCellRange.parse(data, offset, cellRange);
-                offset+= XSSFBCellRange.length;
                 //for strict parsing; confirm that firstRow==lastRow and firstCol==colLats (2.4.28)
-                cellAddress = new CellAddress(cellRange.firstRow, cellRange.firstCol);
+                cellAddress = new CellAddress(cellRange.getFirstRow(), cellRange.getFirstCol());
                 break;
             case BrtCommentText:
                 XSSFBRichStr xssfbRichStr = XSSFBRichStr.build(data, 0);

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

@@ -149,7 +149,7 @@ public void handleRecord(int recordType, byte[] data) throws XSSFBParseException
             xlWideStringBuffer.setLength(0);
             /*offset +=*/ XSSFBUtils.readXLWideString(data, offset, xlWideStringBuffer);
             String display = xlWideStringBuffer.toString();
-            CellRangeAddress cellRangeAddress = new CellRangeAddress(hyperlinkCellRange.firstRow, hyperlinkCellRange.lastRow, hyperlinkCellRange.firstCol, hyperlinkCellRange.lastCol);
+            CellRangeAddress cellRangeAddress = new CellRangeAddress(hyperlinkCellRange.getFirstRow(), hyperlinkCellRange.getLastRow(), hyperlinkCellRange.getFirstCol(), hyperlinkCellRange.getLastCol());
 
             String url = relIdToHyperlink.get(relId);
             if (location.isEmpty()) {

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

@@ -20,10 +20,10 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 import org.apache.poi.util.Internal;
 
 /**
- * @since 3.16-beta3
+ * @since 6.0.0
  */
 @Internal
-class XSSFBRichStr {
+public class XSSFBRichStr {
 
     public static XSSFBRichStr build(byte[] bytes, int offset) throws XSSFBParseException {
         byte first = bytes[offset];

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

@@ -132,8 +132,8 @@ public void handleRecord(int recordType, byte[] data) throws XSSFBParseException
                     strings.add(rstr.getString());
                     break;
                 case BrtBeginSst:
-                    count = XSSFBUtils.castToInt(LittleEndian.getUInt(data,0));
-                    uniqueCount = XSSFBUtils.castToInt(LittleEndian.getUInt(data, 4));
+                    count = Math.toIntExact(LittleEndian.getUInt(data,0));
+                    uniqueCount = Math.toIntExact(LittleEndian.getUInt(data, 4));
                     break;
             }
 

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

@@ -130,7 +130,7 @@ public void handleRecord(int id, byte[] data) throws XSSFBParseException {
 
         switch(type) {
             case BrtRowHdr:
-                int rw = XSSFBUtils.castToInt(LittleEndian.getUInt(data, 0));
+                int rw = Math.toIntExact(LittleEndian.getUInt(data, 0));
                 if (rw > 0x00100000) {//could make sure this is larger than currentRow, according to spec?
                     throw new XSSFBParseException("Row number beyond allowable range: "+rw);
                 }
@@ -298,7 +298,7 @@ private void handleCellRk(byte[] data) {
 
     private void handleBrtCellIsst(byte[] data) {
         beforeCellValue(data);
-        int idx = XSSFBUtils.castToInt(LittleEndian.getUInt(data, XSSFBCellHeader.length));
+        int idx = Math.toIntExact(LittleEndian.getUInt(data, XSSFBCellHeader.length));
         RichTextString rtss = stringsTable.getItemAt(idx);
         handleStringCellValue(rtss.getString());
     }

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

@@ -20,7 +20,6 @@ Licensed to the Apache Software Foundation (ASF) under one or more
 
 import java.nio.charset.StandardCharsets;
 
-import org.apache.poi.ooxml.POIXMLException;
 import org.apache.poi.util.Internal;
 import org.apache.poi.util.LittleEndian;
 
@@ -38,7 +37,7 @@ public class XSSFBUtils {
      * @return number of bytes read
      * @throws XSSFBParseException if there was an exception during reading
      */
-    static int readXLNullableWideString(byte[] data, int offset, StringBuilder sb) throws XSSFBParseException {
+    public static int readXLNullableWideString(byte[] data, int offset, StringBuilder sb) throws XSSFBParseException {
         long numChars = LittleEndian.getUInt(data, offset);
         if (numChars < 0) {
             throw new XSSFBParseException("too few chars to read");
@@ -85,23 +84,9 @@ public static int readXLWideString(byte[] data, int offset, StringBuilder sb) th
         return numBytes;
     }
 
-    static int castToInt(long val) {
-        if (val < Integer.MAX_VALUE && val > Integer.MIN_VALUE) {
-            return (int)val;
-        }
-        throw new POIXMLException("val ("+val+") can't be cast to int");
-    }
-
-    static short castToShort(int val) {
-        if (val < Short.MAX_VALUE && val > Short.MIN_VALUE) {
-            return (short)val;
-        }
-        throw new POIXMLException("val ("+val+") can't be cast to short");
-
-    }
 
     //TODO: move to LittleEndian?
-    static int get24BitInt( byte[] data, int offset) {
+    public static int get24BitInt(byte[] data, int offset) {
         int i = offset;
         int b0 = data[i++] & 0xFF;
         int b1 = data[i++] & 0xFF;