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- /* ====================================================================
- Licensed to the Apache Software Foundation (ASF) under one or more
- contributor license agreements. See the NOTICE file distributed with
- this work for additional information regarding copyright ownership.
- The ASF licenses this file to You under the Apache License, Version 2.0
- (the "License"); you may not use this file except in compliance with
- the License. You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
- ==================================================================== */
-
- package org.apache.poi.hssf.record.aggregates;
-
- import org.apache.poi.hssf.model.RecordStream;
- import org.apache.poi.hssf.record.ObjectProtectRecord;
- import org.apache.poi.hssf.record.PasswordRecord;
- import org.apache.poi.hssf.record.ProtectRecord;
- import org.apache.poi.hssf.record.Record;
- import org.apache.poi.hssf.record.RecordFormatException;
- import org.apache.poi.hssf.record.ScenarioProtectRecord;
- import org.apache.poi.poifs.crypt.CryptoFunctions;
-
- /**
- * Groups the sheet protection records for a worksheet.
- * <p/>
- *
- * See OOO excelfileformat.pdf sec 4.18.2 'Sheet Protection in a Workbook
- * (BIFF5-BIFF8)'
- *
- * @author Josh Micich
- */
- public final class WorksheetProtectionBlock extends RecordAggregate {
- // Every one of these component records is optional
- // (The whole WorksheetProtectionBlock may not be present)
- private ProtectRecord _protectRecord;
- private ObjectProtectRecord _objectProtectRecord;
- private ScenarioProtectRecord _scenarioProtectRecord;
- private PasswordRecord _passwordRecord;
-
- /**
- * Creates an empty WorksheetProtectionBlock
- */
- public WorksheetProtectionBlock() {
- // all fields empty
- }
-
- /**
- * @return <code>true</code> if the specified Record sid is one belonging to
- * the 'Page Settings Block'.
- */
- public static boolean isComponentRecord(int sid) {
- switch (sid) {
- case ProtectRecord.sid:
- case ObjectProtectRecord.sid:
- case ScenarioProtectRecord.sid:
- case PasswordRecord.sid:
- return true;
- }
- return false;
- }
-
- private boolean readARecord(RecordStream rs) {
- switch (rs.peekNextSid()) {
- case ProtectRecord.sid:
- checkNotPresent(_protectRecord);
- _protectRecord = (ProtectRecord) rs.getNext();
- break;
- case ObjectProtectRecord.sid:
- checkNotPresent(_objectProtectRecord);
- _objectProtectRecord = (ObjectProtectRecord) rs.getNext();
- break;
- case ScenarioProtectRecord.sid:
- checkNotPresent(_scenarioProtectRecord);
- _scenarioProtectRecord = (ScenarioProtectRecord) rs.getNext();
- break;
- case PasswordRecord.sid:
- checkNotPresent(_passwordRecord);
- _passwordRecord = (PasswordRecord) rs.getNext();
- break;
- default:
- // all other record types are not part of the PageSettingsBlock
- return false;
- }
- return true;
- }
-
- private void checkNotPresent(Record rec) {
- if (rec != null) {
- throw new RecordFormatException("Duplicate PageSettingsBlock record (sid=0x"
- + Integer.toHexString(rec.getSid()) + ")");
- }
- }
-
- public void visitContainedRecords(RecordVisitor rv) {
- // Replicates record order from Excel 2007, though this is not critical
-
- visitIfPresent(_protectRecord, rv);
- visitIfPresent(_objectProtectRecord, rv);
- visitIfPresent(_scenarioProtectRecord, rv);
- visitIfPresent(_passwordRecord, rv);
- }
-
- private static void visitIfPresent(Record r, RecordVisitor rv) {
- if (r != null) {
- rv.visitRecord(r);
- }
- }
-
- public PasswordRecord getPasswordRecord() {
- return _passwordRecord;
- }
-
- public ScenarioProtectRecord getHCenter() {
- return _scenarioProtectRecord;
- }
-
- /**
- * This method reads {@link WorksheetProtectionBlock} records from the supplied RecordStream
- * until the first non-WorksheetProtectionBlock record is encountered. As each record is read,
- * it is incorporated into this WorksheetProtectionBlock.
- * <p/>
- * As per the OOO documentation, the protection block records can be expected to be written
- * together (with no intervening records), but earlier versions of POI (prior to Jun 2009)
- * didn't do this. Workbooks with sheet protection created by those earlier POI versions
- * seemed to be valid (Excel opens them OK). So PO allows continues to support reading of files
- * with non continuous worksheet protection blocks.
- *
- * <p/>
- * <b>Note</b> - when POI writes out this WorksheetProtectionBlock, the records will always be
- * written in one consolidated block (in the standard ordering) regardless of how scattered the
- * records were when they were originally read.
- */
- public void addRecords(RecordStream rs) {
- while (true) {
- if (!readARecord(rs)) {
- break;
- }
- }
- }
-
- /**
- * @return the ProtectRecord. If one is not contained in the sheet, then one
- * is created.
- */
- private ProtectRecord getProtect() {
- if (_protectRecord == null) {
- _protectRecord = new ProtectRecord(false);
- }
- return _protectRecord;
- }
-
- /**
- * @return the PasswordRecord. If one is not contained in the sheet, then
- * one is created.
- */
- private PasswordRecord getPassword() {
- if (_passwordRecord == null) {
- _passwordRecord = createPassword();
- }
- return _passwordRecord;
- }
-
- /**
- * protect a spreadsheet with a password (not encrypted, just sets protect
- * flags and the password.
- *
- * @param password to set. Pass <code>null</code> to remove all protection
- * @param shouldProtectObjects are protected
- * @param shouldProtectScenarios are protected
- */
- public void protectSheet(String password, boolean shouldProtectObjects,
- boolean shouldProtectScenarios) {
- if (password == null) {
- _passwordRecord = null;
- _protectRecord = null;
- _objectProtectRecord = null;
- _scenarioProtectRecord = null;
- return;
- }
-
- ProtectRecord prec = getProtect();
- PasswordRecord pass = getPassword();
- prec.setProtect(true);
- pass.setPassword((short)CryptoFunctions.createXorVerifier1(password));
- if (_objectProtectRecord == null && shouldProtectObjects) {
- ObjectProtectRecord rec = createObjectProtect();
- rec.setProtect(true);
- _objectProtectRecord = rec;
- }
- if (_scenarioProtectRecord == null && shouldProtectScenarios) {
- ScenarioProtectRecord srec = createScenarioProtect();
- srec.setProtect(true);
- _scenarioProtectRecord = srec;
- }
- }
-
- public boolean isSheetProtected() {
- return _protectRecord != null && _protectRecord.getProtect();
- }
-
- public boolean isObjectProtected() {
- return _objectProtectRecord != null && _objectProtectRecord.getProtect();
- }
-
- public boolean isScenarioProtected() {
- return _scenarioProtectRecord != null && _scenarioProtectRecord.getProtect();
- }
-
- /**
- * creates an ObjectProtect record with protect set to false.
- */
- private static ObjectProtectRecord createObjectProtect() {
- ObjectProtectRecord retval = new ObjectProtectRecord();
- retval.setProtect(false);
- return retval;
- }
-
- /**
- * creates a ScenarioProtect record with protect set to false.
- */
- private static ScenarioProtectRecord createScenarioProtect() {
- ScenarioProtectRecord retval = new ScenarioProtectRecord();
- retval.setProtect(false);
- return retval;
- }
-
- /**
- * creates a Password record with password set to 0x0000.
- */
- private static PasswordRecord createPassword() {
- return new PasswordRecord(0x0000);
- }
-
- public int getPasswordHash() {
- if (_passwordRecord == null) {
- return 0;
- }
- return _passwordRecord.getPassword();
- }
- }
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