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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
package com.sun.star.lib.uno.adapter;
import java.io.IOException;
import com.sun.star.io.XInputStream;
import java.io.InputStream;
/**
* The <code>XInputStreamToInputStreamAdapter</code> wraps
* the UNO <code>XInputStream</code> object in a Java
* <code>InputStream</code>. This allows users to access
* an <code>XInputStream</code> as if it were an
* <code>InputStream</code>.
*/
public final class XInputStreamToInputStreamAdapter extends InputStream {
/**
* Internal handle to the XInputStream
*/
private XInputStream xin;
/**
* Constructor.
*
* @param in The <code>XInputStream</code> to be
* accessed as an <code>InputStream</code>.
*/
public XInputStreamToInputStreamAdapter (XInputStream in) {
xin = in;
}
@Override
public int available() throws IOException {
int bytesAvail;
try {
bytesAvail = xin.available();
} catch (Exception e) {
IOException newEx = new IOException(e.getMessage());
newEx.initCause(e);
throw newEx;
}
return(bytesAvail);
}
@Override
public void close() throws IOException {
try {
xin.closeInput();
} catch (Exception e) {
IOException newEx = new IOException(e.getMessage());
newEx.initCause(e);
throw newEx;
}
}
@Override
public int read () throws IOException {
byte [][] tmp = new byte [1][1];
try {
long bytesRead = xin.readBytes(tmp, 1);
if (bytesRead <= 0) {
return (-1);
} else {
int tmpInt = tmp[0][0];
if (tmpInt< 0 ){
tmpInt = 256 +tmpInt;
}
return(tmpInt);
}
} catch (Exception e) {
IOException newEx = new IOException(e.getMessage());
newEx.initCause(e);
throw newEx;
}
}
@Override
public int read (byte[] b) throws IOException {
byte [][] tmp = new byte [1][b.length];
int bytesRead;
try {
bytesRead = xin.readBytes(tmp, b.length);
if (bytesRead <= 0) {
return(-1);
} else if (bytesRead < b.length) {
System.arraycopy(tmp[0], 0, b, 0, bytesRead);
} else {
System.arraycopy(tmp[0], 0, b, 0, b.length);
}
} catch (Exception e) {
IOException newEx = new IOException(e.getMessage());
newEx.initCause(e);
throw newEx;
}
return (bytesRead);
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
byte [][] tmp = new byte [1][b.length];
try {
long bytesRead;
int av = xin.available();
if ( av != 0 && len > av) {
bytesRead = xin.readBytes(tmp, av);
}
else{
bytesRead = xin.readBytes(tmp,len);
}
// Casting bytesRead to an int is okay, since the user can
// only pass in an integer length to read, so the bytesRead
// must <= len.
if (bytesRead <= 0) {
return(-1);
} else if (bytesRead < len) {
System.arraycopy(tmp[0], 0, b, off, (int)bytesRead);
} else {
System.arraycopy(tmp[0], 0, b, off, len);
}
return ((int)bytesRead);
} catch (Exception e) {
IOException newEx = new IOException(e.getMessage());
newEx.initCause(e);
throw newEx;
}
}
@Override
public long skip(long n) throws IOException {
int avail;
long tmpLongVal = n;
int tmpIntVal;
try {
avail = xin.available();
} catch (Exception e) {
IOException newEx = new IOException(e.getMessage());
newEx.initCause(e);
throw newEx;
}
do {
if (tmpLongVal >= Integer.MAX_VALUE) {
tmpIntVal = Integer.MAX_VALUE;
} else {
// Casting is safe here.
tmpIntVal = (int)tmpLongVal;
}
tmpLongVal -= tmpIntVal;
try {
xin.skipBytes(tmpIntVal);
} catch (Exception e) {
IOException newEx = new IOException(e.getMessage());
newEx.initCause(e);
throw newEx;
}
} while (tmpLongVal > 0);
if ( avail != 0 && avail < n) {
return(avail);
} else {
return(n);
}
}
/**
* Tests if this input stream supports the mark and reset methods.
* The markSupported method of
* <code>XInputStreamToInputStreamAdapter</code> returns false.
*
* @return false
*/
@Override
public boolean markSupported() {
return false;
}
@Override
public void mark(int readlimit) {
// Not supported.
}
@Override
public void reset() throws IOException {
// Not supported.
}
}
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