passwordrecord.java

来自「实现JAVA界面的代码GWT」· Java 代码 · 共 65 行

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi 
// Source File Name:   PasswordRecord.java

package jxl.write.biff;

import jxl.biff.*;

class PasswordRecord extends WritableRecordData
{

    private String password;
    private byte data[];

    public PasswordRecord(String pw)
    {
        super(Type.PASSWORD);
        password = pw;
        if(pw == null)
        {
            data = new byte[2];
            IntegerHelper.getTwoBytes(0, 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;
            data = new byte[2];
            IntegerHelper.getTwoBytes(passwordHash, data, 0);
        }
    }

    public PasswordRecord(int ph)
    {
        super(Type.PASSWORD);
        data = new byte[2];
        IntegerHelper.getTwoBytes(ph, data, 0);
    }

    public byte[] getData()
    {
        return 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;
    }
}