HexDumpEncoderの代わりになるものを作ろうとしてみた

HexDump.java

package net.flourity.lib;

import java.io.*;

public class HexDump
{
	public static String hexDump(byte[] b)
	{
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		PrintStream stream = new PrintStream(out);
		ByteArrayInputStream in = new ByteArrayInputStream(b);
		String str = null;
		int line = 0;
		byte[] buf = new byte[16];

		try
		{
			while(true)
			{
				int len = reads(in, buf);
				if(len==0) break;
				writeHex(out, (byte)((line >>> 8) & 0xff));
				writeHex(out, (byte)(line & 0xff));
				out.write(58);
				out.write(32);
				for(int i=0;i<len;i++)
				{
					writeHex(out, buf[i]);
					out.write(32);
					if(i==7)
					{
						out.write(32);
						out.write(32);
					}
				}
				if(len<16) break;
				out.write(32);
				for(int i=0;i<16;i++)
				{
					int c = buf[i];
					out.write((c<32 || c>122) ? 46 : c);
				}
				stream.println();
				line += 16;
			}
			str = out.toString("8859_1");
		}
		catch(IOException e)
		{
			throw new RuntimeException(e);
		}

		return str;
	}

	private static int reads(InputStream in, byte[] buf) throws IOException
	{
		final int len = buf.length;
		for(int i=0;i<len;i++)
		{
			int j = in.read();
			if(j==-1) return i;
			buf[i] = (byte)j;
		}
		return len;
	}

	private static void writeHex(OutputStream out, byte b) throws IOException
	{
		int c = (b >>> 4) & 15;
		c += c>9 ? 55 : 48;
		out.write(c);
		c = b& 15;
		c += c>9 ? 55 : 48;
		out.write(c);
	}
}