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/*
* Distributed as part of mchange-commons-java 0.2.9
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v1.io;
import java.io.*;
import com.mchange.v2.log.*;
public final class InputStreamUtils
{
private final static MLogger logger = MLog.getLogger( InputStreamUtils.class );
public static boolean compare(InputStream is1, InputStream is2, long num_bytes) throws IOException
{
int b;
for (long num_read = 0; num_read < num_bytes; ++num_read)
{
if ((b = is1.read()) != is2.read())
return false;
else if (b < 0) //both EOF
break;
}
return true;
}
public static boolean compare(InputStream is1, InputStream is2) throws IOException
{
int b = 0;
while (b >= 0)
if ((b = is1.read()) != is2.read())
return false;
return true;
}
public static byte[] getBytes(InputStream is, int max_len) throws IOException
{
ByteArrayOutputStream baos = new ByteArrayOutputStream(max_len);
for(int i = 0, b = is.read(); b >= 0 && i < max_len; b = is.read(), ++i)
baos.write(b);
return baos.toByteArray();
}
public static byte[] getBytes(InputStream is) throws IOException
{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
for(int b = is.read(); b >= 0; b = is.read()) baos.write(b);
return baos.toByteArray();
}
public static String getContentsAsString(InputStream is, String enc)
throws IOException, UnsupportedEncodingException
{return new String(getBytes(is), enc);}
public static String getContentsAsString(InputStream is)
throws IOException
{
try
{return getContentsAsString(is, System.getProperty("file.encoding", "8859_1"));}
catch (UnsupportedEncodingException e)
{
throw new InternalError("You have no default character encoding, and " +
"iso-8859-1 is unsupported?!?!");
}
}
public static String getContentsAsString(InputStream is, int max_len, String enc)
throws IOException, UnsupportedEncodingException
{return new String(getBytes(is, max_len), enc);}
public static String getContentsAsString(InputStream is, int max_len)
throws IOException
{
try
{return getContentsAsString(is, max_len, System.getProperty("file.encoding", "8859_1"));}
catch (UnsupportedEncodingException e)
{
throw new InternalError("You have no default character encoding, and " +
"iso-8859-1 is unsupported?!?!");
}
}
public static InputStream getEmptyInputStream()
{return EMPTY_ISTREAM;}
public static void attemptClose(InputStream is)
{
try
{if (is != null) is.close();}
catch (IOException e)
{
//e.printStackTrace();
if ( logger.isLoggable( MLevel.WARNING ) )
logger.log( MLevel.WARNING, "InputStream close FAILED.", e );
}
}
public static void skipFully(InputStream is, long num_bytes) throws EOFException, IOException
{
long num_skipped = 0;
while (num_skipped < num_bytes)
{
long just_skipped = is.skip(num_bytes - num_skipped);
if (just_skipped > 0)
num_skipped += just_skipped;
else
{
int test_byte = is.read();
if (is.read() < 0)
throw new EOFException("Skipped only " + num_skipped + " bytes to end of file.");
else
++num_skipped;
}
}
}
/* Is it appropriate to treat this as a constant? Is it */
/* in any discernable sense changed by read() operations */
private static InputStream EMPTY_ISTREAM = new ByteArrayInputStream(new byte[0]);
private InputStreamUtils()
{}
}
