com.zving.preloader.zip.NioZipEncoding Maven / Gradle / Ivy
package com.zving.preloader.zip;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import java.nio.charset.CodingErrorAction;
class NioZipEncoding
implements ZipEncoding
{
private final Charset charset;
public NioZipEncoding(Charset charset)
{
this.charset = charset;
}
public boolean canEncode(String name)
{
CharsetEncoder enc = this.charset.newEncoder();
enc.onMalformedInput(CodingErrorAction.REPORT);
enc.onUnmappableCharacter(CodingErrorAction.REPORT);
return enc.canEncode(name);
}
public ByteBuffer encode(String name)
{
CharsetEncoder enc = this.charset.newEncoder();
enc.onMalformedInput(CodingErrorAction.REPORT);
enc.onUnmappableCharacter(CodingErrorAction.REPORT);
CharBuffer cb = CharBuffer.wrap(name);
ByteBuffer out = ByteBuffer.allocate(name.length() +
(name.length() + 1) / 2);
while (cb.remaining() > 0)
{
CoderResult res = enc.encode(cb, out, true);
if ((res.isUnmappable()) || (res.isMalformed()))
{
if (res.length() * 6 > out.remaining()) {
out = ZipEncodingHelper.growBuffer(out, out.position() +
res.length() * 6);
}
for (int i = 0; i < res.length(); i++) {
ZipEncodingHelper.appendSurrogate(out, cb.get());
}
}
else if (res.isOverflow())
{
out = ZipEncodingHelper.growBuffer(out, 0);
}
else if (res.isUnderflow())
{
enc.flush(out);
break;
}
}
out.limit(out.position());
out.rewind();
return out;
}
public String decode(byte[] data)
throws IOException
{
return
this.charset.newDecoder().onMalformedInput(CodingErrorAction.REPORT).onUnmappableCharacter(CodingErrorAction.REPORT).decode(ByteBuffer.wrap(data)).toString();
}
}