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package com.github.downgoon.jresty.commons.security;

import java.io.ByteArrayOutputStream;

/**
 * @author liwei
 * @since	2008-08-05
 * */
public class HexCodec {
	
	public static String hexUpperAscii(byte[] data) {
		return byte2HexFormat(data, 16, Configuration.byte2HexUpper,Configuration.byte2ASCII);
	}	
	
	public static String hexLowerAscii(byte[] data) {
		return byte2HexFormat(data, 16, Configuration.byte2HexLower,Configuration.byte2ASCII);
	}
	
	public static String hexUpperAscii(byte[] data,int width) {
		return byte2HexFormat(data, width, Configuration.byte2HexUpper,Configuration.byte2ASCII);
	}
	
	public static String hexLowerAscii(byte[] data,int width) {
		return byte2HexFormat(data, width, Configuration.byte2HexLower,Configuration.byte2ASCII);
	}
	
	/** 将byte[]数据以十六进制的形式显示，显示格式仿照UltraEdit*/
	private static String byte2HexFormat(byte[] data,int width,
			IByte2String hexPartitionMethod,IByte2String strPartitionMethod) 
	{
		StringBuffer sb = new StringBuffer();
		//表头
		for(int i=0;i15) {
				throw new IllegalArgumentException("输入参数"+high+","+lower+"都必须控制在范围[0,15]内");
			}
			return (byte)(high << 4 | lower);
		}
		
		/** 各个Byte之间的分割符号*/
		static final String DELIMITER = " ";
		
		/** Hex显示和字符显示区域分割符*/
		static final String PARTITION = ";";
		
		static IByte2String byte2HexUpper = new Byte2HexUpper();
		
		static IByte2String byte2HexLower = new Byte2HexLower();
		
		static IByte2String byte2ASCII = new Byte2ASCII();
		
	} 
	
	static interface IByte2String {
		public String byte2String(byte b); 
	}
	
	static class Byte2HexUpper implements IByte2String {
		public String byte2String(byte b) {
			int high = 0x0F & b>>4;
			int low  = 0x0F & b;
			return new String(new char[] {Configuration.HEX_UPPER_CASE[high],
								Configuration.HEX_UPPER_CASE[low]});
		}
	}
	
	static class Byte2HexLower implements IByte2String {
		public String byte2String(byte b) {
			int high = 0x0F & b>>4;
			int low  = 0x0F & b;
			return new String(new char[] {Configuration.HEX_LOWER_CASE[high],
							Configuration.HEX_LOWER_CASE[low]});
		}
	}
	
	static class Byte2ASCII implements IByte2String {
		private final String INVISIBLE_SUBSTITUTION = ".";
		
		public String byte2String(byte b) {
			return (Character.isWhitespace(b) || Character.isLetterOrDigit(b)) ? new String(new byte[]{b}) : INVISIBLE_SUBSTITUTION;
		}
	}
}