/* * Distributed as part of c3p0 v.0.9.1-pre6 * * Copyright (C) 2005 Machinery For Change, Inc. * * Author: Steve Waldman <swaldman@mchange.com> * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License version 2.1, as  * published by the Free Software Foundation. * * 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.  See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this software; see the file LICENSE.  If not, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. */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()    {}}