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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.hemf.record;
-
- import static java.nio.charset.StandardCharsets.UTF_16LE;
-
- import java.io.ByteArrayInputStream;
- import java.io.EOFException;
- import java.io.IOException;
- import java.io.InputStreamReader;
- import java.io.Reader;
- import java.nio.charset.Charset;
-
- import org.apache.poi.util.IOUtils;
- import org.apache.poi.util.Internal;
- import org.apache.poi.util.LittleEndian;
- import org.apache.poi.util.LittleEndianInputStream;
- import org.apache.poi.util.RecordFormatException;
-
- /**
- * Container class to gather all text-related commands
- * This is starting out as read only, and very little is actually
- * implemented at this point!
- */
- @Internal
- public class HemfText {
-
- private static final int MAX_RECORD_LENGTH = 1_000_000;
-
- public static class ExtCreateFontIndirectW extends UnimplementedHemfRecord {
- }
-
- public static class ExtTextOutA implements HemfRecord {
-
- private long left,top,right,bottom;
-
- //TODO: translate this to a graphicsmode enum
- private long graphicsMode;
-
- private long exScale;
- private long eyScale;
- EmrTextObject textObject;
-
- @Override
- public HemfRecordType getRecordType() {
- return HemfRecordType.exttextouta;
- }
-
- @Override
- public long init(LittleEndianInputStream leis, long recordId, long recordSize) throws IOException {
- //note that the first 2 uInts have been read off and the recordsize has
- //been decreased by 8
- left = leis.readInt();
- top = leis.readInt();
- right = leis.readInt();
- bottom = leis.readInt();
- graphicsMode = leis.readUInt();
- exScale = leis.readUInt();
- eyScale = leis.readUInt();
-
- int recordSizeInt = -1;
- if (recordSize < Integer.MAX_VALUE) {
- recordSizeInt = (int)recordSize;
- } else {
- throw new RecordFormatException("can't have text length > Integer.MAX_VALUE");
- }
- //guarantee to read the rest of the EMRTextObjectRecord
- //emrtextbytes start after 7*4 bytes read above
- byte[] emrTextBytes = IOUtils.safelyAllocate(recordSizeInt-(7*LittleEndian.INT_SIZE), MAX_RECORD_LENGTH);
- IOUtils.readFully(leis, emrTextBytes);
- textObject = new EmrTextObject(emrTextBytes, getEncodingHint(), 20);//should be 28, but recordSizeInt has already subtracted 8
- return recordSize;
- }
-
- protected Charset getEncodingHint() {
- return null;
- }
-
- /**
- *
- * To be implemented! We need to get the current character set
- * from the current font for {@link ExtTextOutA},
- * which has to be tracked in the playback device.
- *
- * For {@link ExtTextOutW}, the charset is "UTF-16LE"
- *
- * @param charset the charset to be used to decode the character bytes
- * @return text from this text element
- * @throws IOException
- */
- public String getText(Charset charset) throws IOException {
- return textObject.getText(charset);
- }
-
- /**
- *
- * @return the x offset for the EmrTextObject
- */
- public long getX() {
- return textObject.x;
- }
-
- /**
- *
- * @return the y offset for the EmrTextObject
- */
- public long getY() {
- return textObject.y;
- }
-
- public long getLeft() {
- return left;
- }
-
- public long getTop() {
- return top;
- }
-
- public long getRight() {
- return right;
- }
-
- public long getBottom() {
- return bottom;
- }
-
- public long getGraphicsMode() {
- return graphicsMode;
- }
-
- public long getExScale() {
- return exScale;
- }
-
- public long getEyScale() {
- return eyScale;
- }
-
- }
-
- public static class ExtTextOutW extends ExtTextOutA {
-
- @Override
- public HemfRecordType getRecordType() {
- return HemfRecordType.exttextoutw;
- }
-
- @Override
- protected Charset getEncodingHint() {
- return UTF_16LE;
- }
-
- public String getText() throws IOException {
- return getText(UTF_16LE);
- }
- }
-
- /**
- * Needs to be implemented. Couldn't find example.
- */
- public static class PolyTextOutA extends UnimplementedHemfRecord {
-
- }
-
- /**
- * Needs to be implemented. Couldn't find example.
- */
- public static class PolyTextOutW extends UnimplementedHemfRecord {
-
- }
-
- public static class SetTextAlign extends UnimplementedHemfRecord {
- }
-
- public static class SetTextColor extends UnimplementedHemfRecord {
- }
-
-
- public static class SetTextJustification extends UnimplementedHemfRecord {
-
- }
-
- private static class EmrTextObject {
- long x;
- long y;
- int numChars;
- byte[] rawTextBytes;//this stores _all_ of the bytes to the end of the EMRTextObject record.
- //Because of potential variable length encodings, must
- //carefully read only the numChars from this byte array.
-
- EmrTextObject(byte[] emrTextObjBytes, Charset charsetHint, int readSoFar) throws IOException {
-
- int offset = 0;
- x = LittleEndian.getUInt(emrTextObjBytes, offset); offset+= LittleEndian.INT_SIZE;
- y = LittleEndian.getUInt(emrTextObjBytes, offset); offset+= LittleEndian.INT_SIZE;
- long numCharsLong = LittleEndian.getUInt(emrTextObjBytes, offset); offset += LittleEndian.INT_SIZE;
- long offString = LittleEndian.getUInt(emrTextObjBytes, offset); offset += LittleEndian.INT_SIZE;
- int start = (int)offString-offset-readSoFar;
-
- if (numCharsLong == 0) {
- rawTextBytes = new byte[0];
- numChars = 0;
- return;
- }
- if (numCharsLong > Integer.MAX_VALUE) {
- throw new RecordFormatException("Number of characters can't be > Integer.MAX_VALUE");
- } else if (numCharsLong < 0) {
- throw new RecordFormatException("Number of characters can't be < 0");
- }
-
- numChars = (int)numCharsLong;
- rawTextBytes = IOUtils.safelyAllocate(emrTextObjBytes.length-start, MAX_RECORD_LENGTH);
- System.arraycopy(emrTextObjBytes, start, rawTextBytes, 0, emrTextObjBytes.length-start);
- }
-
- String getText(Charset charset) throws IOException {
- StringBuilder sb = new StringBuilder();
- try (Reader r = new InputStreamReader(new ByteArrayInputStream(rawTextBytes), charset)) {
- for (int i = 0; i < numChars; i++) {
- sb.appendCodePoint(readCodePoint(r));
- }
- }
- return sb.toString();
- }
-
- //TODO: move this to IOUtils?
- private int readCodePoint(Reader r) throws IOException {
- int c1 = r.read();
- if (c1 == -1) {
- throw new EOFException("Tried to read beyond byte array");
- }
- if (!Character.isHighSurrogate((char)c1)) {
- return c1;
- }
- int c2 = r.read();
- if (c2 == -1) {
- throw new EOFException("Tried to read beyond byte array");
- }
- if (!Character.isLowSurrogate((char)c2)) {
- throw new RecordFormatException("Expected low surrogate after high surrogate");
- }
- return Character.toCodePoint((char)c1, (char)c2);
- }
- }
-
-
- }
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