first commit

hrmsEjb/jxl/write/biff/PasswordRecord.java

@@ -0,0 +1,53 @@
+package jxl.write.biff;
+
+import jxl.biff.IntegerHelper;
+import jxl.biff.Type;
+import jxl.biff.WritableRecordData;
+
+class PasswordRecord extends WritableRecordData {
+  private String password;
+  
+  private byte[] data;
+  
+  public PasswordRecord(String pw) {
+    super(Type.PASSWORD);
+    this.password = pw;
+    if (pw == null) {
+      this.data = new byte[2];
+      IntegerHelper.getTwoBytes(0, this.data, 0);
+    } else {
+      byte[] passwordBytes = pw.getBytes();
+      int passwordHash = 0;
+      for (int a = 0; a < passwordBytes.length; a++) {
+        int shifted = rotLeft15Bit(passwordBytes[a], a + 1);
+        passwordHash ^= shifted;
+      } 
+      passwordHash ^= passwordBytes.length;
+      passwordHash ^= 0xCE4B;
+      this.data = new byte[2];
+      IntegerHelper.getTwoBytes(passwordHash, this.data, 0);
+    } 
+  }
+  
+  public PasswordRecord(int ph) {
+    super(Type.PASSWORD);
+    this.data = new byte[2];
+    IntegerHelper.getTwoBytes(ph, this.data, 0);
+  }
+  
+  public byte[] getData() {
+    return this.data;
+  }
+  
+  private int rotLeft15Bit(int val, int rotate) {
+    val &= 0x7FFF;
+    for (; rotate > 0; rotate--) {
+      if ((val & 0x4000) != 0) {
+        val = (val << 1 & 0x7FFF) + 1;
+      } else {
+        val = val << 1 & 0x7FFF;
+      } 
+    } 
+    return val;
+  }
+}