first commit

hrmsEjb/jxl/biff/ByteArray.java

@@ -0,0 +1,47 @@
+package jxl.biff;
+
+public class ByteArray {
+  private int growSize;
+  
+  private byte[] bytes;
+  
+  private int pos;
+  
+  private static final int defaultGrowSize = 1024;
+  
+  public ByteArray() {
+    this(1024);
+  }
+  
+  public ByteArray(int gs) {
+    this.growSize = gs;
+    this.bytes = new byte[1024];
+    this.pos = 0;
+  }
+  
+  public void add(byte b) {
+    checkSize(1);
+    this.bytes[this.pos] = b;
+    this.pos++;
+  }
+  
+  public void add(byte[] b) {
+    checkSize(b.length);
+    System.arraycopy(b, 0, this.bytes, this.pos, b.length);
+    this.pos += b.length;
+  }
+  
+  public byte[] getBytes() {
+    byte[] returnArray = new byte[this.pos];
+    System.arraycopy(this.bytes, 0, returnArray, 0, this.pos);
+    return returnArray;
+  }
+  
+  private void checkSize(int sz) {
+    while (this.pos + sz >= this.bytes.length) {
+      byte[] newArray = new byte[this.bytes.length + this.growSize];
+      System.arraycopy(this.bytes, 0, newArray, 0, this.pos);
+      this.bytes = newArray;
+    } 
+  }
+}