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/* Copyright (C) 2023 ebandal
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*/
/* 본 제품은 한글과컴퓨터의 ᄒᆞᆫ글 문서 파일(.hwp) 공개 문서를 참고하여 개발하였습니다.
* 개방형 워드프로세서 마크업 언어(OWPML) 문서 구조 KS X 6101:2018 문서를 참고하였습니다.
* 작성자 : 반희수 ebandal@gmail.com
* 작성일 : 2022.10
*/
package HwpDoc.OCFdoc;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.util.HashMap;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import java.util.zip.DataFormatException;
import java.util.zip.Inflater;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class OwpmlFile {
private HashMap<String, Offset> offsetMap = new HashMap<>();
private File file;
public OwpmlFile(String filename) throws FileNotFoundException {
this(new File(filename));
}
public OwpmlFile(File file) throws FileNotFoundException {
this.file = file;
}
public void open() {
try (FileInputStream fileInputStream = new FileInputStream(this.file);
ZipInputStream zipInputStream = new ZipInputStream(fileInputStream)) {
ZipEntry zipEntry = null;
long entryOffset = 0;
while ((zipEntry = zipInputStream.getNextEntry()) != null) {
entryOffset += 30 + zipEntry.getName().length() + (zipEntry.getExtra()==null ? 0 : zipEntry.getExtra().length);
long offsetStart = entryOffset;
entryOffset += zipEntry.getCompressedSize();
long offsetEnd = entryOffset;
int zipMethod = zipEntry.getMethod();
offsetMap.put(zipEntry.getName(), new Offset(offsetStart, offsetEnd, zipMethod));
zipInputStream.closeEntry();
}
} catch (IOException e) {
e.printStackTrace();
}
}
public InputStream getInputStream(String entryName) throws IOException, DataFormatException {
Offset offset = offsetMap.get(entryName);
if (offset == null) {
throw new DataFormatException();
}
long entrySize = (int)(offset.end - offset.start);
byte[] buf = new byte[(int)entrySize];
try (RandomAccessFile raf = new RandomAccessFile(file, "r")) {
raf.seek(offset.start);
int readLen = raf.read(buf, 0, (int)entrySize);
if (offset.zipMethod == ZipEntry.DEFLATED) {
buf = unzip(buf, readLen);
}
}
return new ByteArrayInputStream(buf);
}
public String findBinData(String shortName) {
return null;
}
public byte[] getBytes(String entryName) throws IOException, DataFormatException {
Offset offset = offsetMap.get(entryName);
long entrySize = (int)(offset.end - offset.start);
byte[] buf = new byte[(int)entrySize];
try (RandomAccessFile raf = new RandomAccessFile(file, "r")) {
raf.seek(offset.start);
int readLen = raf.read(buf, 0, (int)entrySize);
if (offset.zipMethod == ZipEntry.DEFLATED) {
buf = unzip(buf, readLen);
}
}
return buf;
}
public List<String> getSections() {
List<String> sections = offsetMap.keySet().stream().filter(s -> s.contains("section"))
.sorted((s1, s2) -> {
int lengthCompare = Integer.compare(s1.length(), s2.length());
if (lengthCompare != 0) {
return lengthCompare;
}
return s1.compareTo(s2);
})
.collect(Collectors.toList());
return sections;
}
public String getBinData(String shortName) {
Optional<String> binData = offsetMap.keySet().stream().filter(s -> s.startsWith("BinData"))
.filter(s -> s.contains(shortName + ".")).findAny();
return binData.orElse("");
}
private byte[] unzip(byte[] input, int inLen) throws IOException, DataFormatException {
Inflater decompressor = new Inflater(true);
decompressor.setInput(input, 0, input.length);
ByteArrayOutputStream bos = new ByteArrayOutputStream(inLen);
// Decompress the data
byte[] buf = new byte[8096];
while (!decompressor.finished()) {
int count = decompressor.inflate(buf);
if (count > 0) {
bos.write(buf, 0, count);
} else {
throw new IOException("can't decompress data");
}
}
bos.close();
return bos.toByteArray();
}
public void close() throws IOException {
}
public static class Offset {
long start;
long end;
int zipMethod;
public Offset(long start, long end, int zipMethod) {
this.start = start;
this.end = end;
this.zipMethod = zipMethod;
}
}
}
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