/*
* Copyright (C) 2007-2011 Geometer Plus <contact@geometerplus.com>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
package org.geometerplus.fbreader.formats.pdb;
import java.io.IOException;
import java.io.InputStream;
import org.geometerplus.zlibrary.core.filesystem.ZLFile;
import org.geometerplus.zlibrary.core.util.ZLInputStreamWithOffset;
public abstract class PdbStream extends InputStream {
protected final ZLInputStreamWithOffset myBase;
public PdbHeader myHeader;
protected byte[] myBuffer;
protected short myBufferLength;
protected short myBufferOffset;
public PdbStream(ZLFile file) throws IOException {
myBase = new ZLInputStreamWithOffset(file.getInputStream());
myHeader = new PdbHeader(myBase);
myBase.skip(myHeader.Offsets[0] - myHeader.length());
myBufferLength = 0;
myBufferOffset = 0;
}
public int read() {
// System.out.println("-hym---mobi--compress---4--");
if (!fillBuffer()) {
return -1;
}
return myBuffer[myBufferOffset++];
}
public int read(byte[] buffer, int offset, int maxSize) {
int realSize = 0;
while (realSize < maxSize) {
if (!fillBuffer()) {
break;
}
int size = Math.min(maxSize - realSize, myBufferLength - myBufferOffset);
if (size > 0) {
if (buffer != null) {
System.arraycopy(myBuffer, myBufferOffset, buffer, offset + realSize, size);
}
realSize += size;
myBufferOffset += size;
}
}
// System.out.println("-hym---mobi--compress---3--"+realSize);
return (realSize > 0) ? realSize : -1;
}
public void close() throws IOException {
if (myBase != null) {
myBase.close();
}
if (myBuffer != null) {
myBuffer = null;
}
}
public void skip(int offset) throws IOException {
if (offset > 0) {
read(null, 0, offset);
} else {
throw new IOException("Cannot skip: " + offset + " bytes");
}
}
protected abstract boolean fillBuffer();
}