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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu)
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.io;
import proguard.classfile.ClassPool;
import java.io.*;
/**
* This DataEntryReader writes the manifest data entries that it reads to a
* given DataEntryWriter, updating their contents based on the renamed classes
* in the given ClassPool.
*
* @author Eric Lafortune
*/
public class ManifestRewriter extends DataEntryRewriter
{
/**
* Creates a new ManifestRewriter.
*/
public ManifestRewriter(ClassPool classPool,
DataEntryWriter dataEntryWriter)
{
super(classPool, dataEntryWriter);
}
// Implementations for DataEntryRewriter.
protected void copyData(Reader reader,
Writer writer)
throws IOException
{
super.copyData(new SplitLineReader(reader),
new SplitLineWriter(writer));
}
/**
* This Reader reads manifest files, joining any split lines. It replaces
* the allowed CR/LF/CR+LF alternatives by simple LF in the process.
*/
private static class SplitLineReader extends FilterReader
{
private static final int NONE = -2;
private int bufferedCharacter = NONE;
public SplitLineReader(Reader reader)
{
super(reader);
}
// Implementations for Reader.
public int read() throws IOException
{
while (true)
{
// Get the buffered character or the first character.
int c1 = bufferedCharacter != NONE ?
bufferedCharacter :
super.read();
// Clear the buffered character.
bufferedCharacter = NONE;
// Return it if it's an ordinary character.
if (c1 != '\n' && c1 != '\r')
{
return c1;
}
// It's a newline. Read the second character to see if it's a
// continuation.
int c2 = super.read();
// Skip any corresponding, redundant \n or \r.
if ((c2 == '\n' || c2 == '\r') && c1 != c2)
{
c2 = super.read();
}
// Isn't it a continuation after all?
if (c2 != ' ')
{
// Buffer the second character and return a newline.
bufferedCharacter = c2;
return '\n';
}
// Just continue after the continuation characters.
}
}
public int read(char[] cbuf, int off, int len) throws IOException
{
// Delegate to reading a single character at a time.
int count = 0;
while (count < len)
{
int c = read();
if (c == -1)
{
break;
}
cbuf[off + count++] = (char)c;
}
return count;
}
public long skip(long n) throws IOException
{
// Delegate to reading a single character at a time.
int count = 0;
while (count < n)
{
int c = read();
if (c == -1)
{
break;
}
count++;
}
return count;
}
}
/**
* This Writer writes manifest files, splitting any long lines.
*/
private static class SplitLineWriter extends FilterWriter
{
private int counter = 0;
public SplitLineWriter(Writer writer)
{
super(writer);
}
// Implementations for Reader.
public void write(int c) throws IOException
{
// TODO: We should actually count the Utf-8 bytes, not the characters.
if (c == '\n')
{
// Reset the character count.
counter = 0;
}
else if (counter == 70)
{
// Insert a newline and a space.
super.write('\n');
super.write(' ');
counter = 2;
}
else
{
counter++;
}
super.write(c);
}
public void write(char[] cbuf, int off, int len) throws IOException
{
for (int count = 0; count < len; count++)
{
write(cbuf[off + count]);
}
}
public void write(String str, int off, int len) throws IOException
{
write(str.toCharArray(), off, len);
}
}
}
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