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/*
* @(#)ReadByteStream.java 1.0.0 04/13/2001 - 11:44:03
*
* Copyright (C) 2001,,2003 2002 Matt Albrecht
* groboclown@users.sourceforge.net
* http://groboutils.sourceforge.net
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package net.sourceforge.groboutils.util.io.v1;
import java.io.File;
import java.io.IOException;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
/**
* Reads a byte array from a stream until the stream is finished.
* You can specify a maximum size to read, and the block read size.
*
* @author Matt Albrecht <a href="mailto:groboclown@users.sourceforge.net">groboclown@users.sourceforge.net</a>
* @since April 13, 2001
* @version $Date: 2003/05/19 20:31:47 $
*/
public class ReadByteStream
{
//----------------------------
// Public data
/**
* Read in an unlimited number of bytes. This can be very
* dangerous.
*/
public static final int READ_TO_END_OF_STREAM = Integer.MAX_VALUE;
/**
* Default block read size.
*/
public static final int DEFAULT_BLOCK_READ_SIZE = 4096;
//----------------------------
// Private data
private InputStream m_is;
private int m_maxSize;
private int m_bufferSize;
//----------------------------
// constructors
/**
* Default constructor
*/
public ReadByteStream( InputStream is )
{
this( is, READ_TO_END_OF_STREAM, DEFAULT_BLOCK_READ_SIZE );
}
/**
*
*/
public ReadByteStream( InputStream is, int maxReadSize, int blockReadSize )
{
setInputStream( is );
setSizes( maxReadSize, blockReadSize );
}
//----------------------------
// Public methods
/**
* Sets the internal input stream.
*/
public void setInputStream( InputStream is )
{
if (is == null)
{
throw new IllegalArgumentException( "input stream is null" );
}
this.m_is = is;
}
/**
* Sets the internal sizes.
*/
public void setSizes( int maxReadSize, int blockReadSize )
{
if (blockReadSize <= 0)
{
blockReadSize = DEFAULT_BLOCK_READ_SIZE;
}
if (maxReadSize <= 0 || maxReadSize > READ_TO_END_OF_STREAM)
{
maxReadSize = READ_TO_END_OF_STREAM;
}
if (maxReadSize < blockReadSize)
{
blockReadSize = maxReadSize;
}
this.m_maxSize = maxReadSize;
this.m_bufferSize = blockReadSize;
}
/**
* Read in the byte stream, using the current settings.
*/
public byte[] readByteStream()
throws IOException
{
return readByteStream( this.m_is, this.m_maxSize, this.m_bufferSize );
}
/**
* Read in the byte stream. Does not close the stream after it has
* finished reading. Uses the default sizes.
*
* @see #readByteStream( InputStream, int, int )
*/
public static byte[] readByteStream( InputStream is )
throws IOException
{
return readByteStream( is, READ_TO_END_OF_STREAM,
DEFAULT_BLOCK_READ_SIZE );
}
/**
* Read in the byte stream. Does not close the stream after it has
* finished reading.
* <P>
* Note that there is no variable checking, for performance reasons.
* The user needs to verify that:
* @param is the input stream, which cannot be <tt>null</tt>.
* @param maxReadSize the maximum number of bytes to read, which
* must be positive, and must be modulo 0 of <tt>blockReadSize</tt>.
* This is an "estimation", and may actually read in more than this
* many bytes if it is not modulo 0 of <tt>blockReadSize</tt>, but
* will always return all the bytes read.
* @param blockReadSize the number of bytes to read in per read command,
* which cannot be more than <tt>maxReadSize</tt>, and cannot be
* less than or equal to zero.
*/
public static byte[] readByteStream( InputStream is, int maxReadSize,
int blockReadSize )
throws IOException
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte buffer[] = new byte[ blockReadSize ];
int size = is.read( buffer, 0, blockReadSize );
int totSize = size;
while (size > 0 && totSize < maxReadSize)
{
baos.write( buffer, 0, size );
size = is.read( buffer, 0, blockReadSize );
totSize += size;
}
baos.close();
return baos.toByteArray();
}
}
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