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