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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.hwpf.model;
-
- import java.nio.charset.Charset;
-
- import org.apache.poi.hwmf.record.HwmfFont;
- import org.apache.poi.util.Internal;
- import org.apache.poi.util.LittleEndian;
- import org.apache.poi.util.POILogFactory;
- import org.apache.poi.util.POILogger;
- import org.apache.poi.util.StringUtil;
-
- /**
- * Word 6.0 Font information
- */
- @Internal
- public final class OldFfn {
-
- private static final POILogger logger = POILogFactory.getLogger(OldFfn.class);
-
- private byte _chs;// character set identifier
-
- private final String fontName;
- private final String altFontName;
-
- private final int length; //length in bytes for this record
-
- /**
- * try to read an OldFfn starting at offset; read no farther than end
- *
- * @param buf buffer from which to read
- * @param offset offset at which to start
- * @param fontTableEnd read no farther than this
- * @return an OldFfn or null if asked to read beyond end
- */
- static OldFfn build(byte[] buf, int offset, int fontTableEnd) {
- int start = offset;
- //preliminary bytes
- if (offset + 6 > fontTableEnd) {
- return null;
- }
- //first byte
- short fontDescriptionLength = (short) buf[offset];
- offset += 1;
- if (offset + fontDescriptionLength > fontTableEnd) {
- logger.log(POILogger.WARN, "Asked to read beyond font table end. Skipping font");
- return null;
- }
-
- //no idea what these 3 bytes do
- offset += 3;
- byte chs = buf[offset];
- Charset charset = null;
- HwmfFont.WmfCharset wmfCharset = HwmfFont.WmfCharset.valueOf(chs & 0xff);
- if (wmfCharset == null) {
- logger.log(POILogger.WARN, "Couldn't find font for type: " + (chs & 0xff));
- } else {
- charset = wmfCharset.getCharset();
- }
- charset = charset == null ? StringUtil.WIN_1252 : charset;
- offset += LittleEndian.BYTE_SIZE;
- //if this byte here == 7, it _may_ signify existence of
- //an altername font name
-
- //not sure what the byte after the _chs does
- offset += LittleEndian.BYTE_SIZE;
- int fontNameLength = -1;
- for (int i = offset; i < fontTableEnd; i++) {
- if (buf[i] == 0) {
- fontNameLength = i - offset;
- break;
- }
- }
- if (fontNameLength == -1) {
- logger.log(POILogger.WARN, "Couldn't find the zero-byte delimited font name length");
- return null;
- }
- String fontName = new String(buf, offset, fontNameLength, charset);
- String altFontName = null;
- int altFontNameLength = -1;
- offset += fontNameLength + 1;
- if (offset - start < fontDescriptionLength) {
- for (int i = offset; i <= start + fontDescriptionLength; i++) {
- if (buf[i] == 0) {
- altFontNameLength = i - offset;
- break;
- }
- }
- if (altFontNameLength > -1) {
- altFontName = new String(buf, offset, altFontNameLength, charset);
- }
- }
- //reset to 0 for length calculation
- altFontNameLength = (altFontNameLength < 0) ? 0 : altFontNameLength + 1;//add one for zero byte
-
- int len = LittleEndian.INT_SIZE + LittleEndian.BYTE_SIZE + LittleEndian.BYTE_SIZE +//6 starting bytes
- fontNameLength + altFontNameLength + 1;//+1 is for the zero byte
- //this len should == fontDescriptionLength
-
- return new OldFfn(chs, fontName, altFontName, len);
-
- }
-
- public OldFfn(byte charsetIdentifier, String fontName, String altFontName, int length) {
- this._chs = charsetIdentifier;
- this.fontName = fontName;
- this.altFontName = altFontName;
- this.length = length;
- }
-
- public byte getChs() {
- return _chs;
- }
-
- public String getMainFontName() {
- return fontName;
- }
-
- /**
- * @return altFontName if it exists, null otherwise
- */
- public String getAltFontName() {
- return altFontName;
- }
-
-
- /**
- * @return length in bytes for this record
- */
- public int getLength() {
- return length;
- }
-
- @Override
- public String toString() {
- return "OldFfn{" +
- "_chs=" + (_chs & 0xff) +
- ", fontName='" + fontName + '\'' +
- ", altFontName='" + altFontName + '\'' +
- ", length=" + length +
- '}';
- }
- }
-
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