package com.sunyard.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class CoderUtil {

    public static byte[] EToA = hexToBytes(getEDBToAsc());
    public static byte[] AToE = hexToBytes(getAscToEDB());

    public static String getAscToEDB() {
        StringBuffer sb = new StringBuffer();
        sb.append("00010203372D2E2F1605250B0C0D0E0F");
        sb.append("101112133C3D322618193F271C1D1E1F");
        sb.append("405A7F7B5B6C507D4D5D5C4E6B604B61");
        sb.append("F0F1F2F3F4F5F6F7F8F97A5E4C7E6E6F");
        sb.append("7CC1C2C3C4C5C6C7C8C9D1D2D3D4D5D6");
        sb.append("D7D8D9E2E3E4E5E6E7E8E9ADE0BD5F6D");
        sb.append("79818283848586878889919293949596");
        sb.append("979899A2A3A4A5A6A7A8A9C04FD0A107");
        sb.append("202122232415061728292A2B2C090A1B");
        sb.append("30311A333435360838393A3B04143EE1");
        sb.append("41424344454647484951525354555657");
        sb.append("58596263646566676869707172737475");
        sb.append("767778808A8B8C8D8E8F909A9B9C9D9E");
        sb.append("9FA0AAABAC4AAEAFB0B1B2B3B4B5B6B7");
        sb.append("B8B9BABBBC6ABEBFCACBCCCDCECFDAdB");
        sb.append("DCDDDEDFEAEBECEDEEEFFAFBFCFDFEFF");
        return sb.toString(); }

    public static String getEDBToAsc() {
        StringBuffer sb = new StringBuffer();
        sb.append("000102039C09867F978D8E0B0C0D0E0F");
        sb.append("101112139D8508871819928F1C1D1E1F");
        sb.append("80818283840A171B88898A8B8C050607");
        sb.append("909116939495960498999A9B14159E1A");
        sb.append("20A0A1A2A3A4A5A6A7A8D52E3C282B7C");
        sb.append("26A9AAABACADAEAFB0B121242A293B5E");
        sb.append("2D2FB2B3B4B5B6B7B8B9E52C255F3E3F");
        sb.append("BABBBCBDBEBFC0C1C2603A2340273D22");
        sb.append("C3616263646566676869C4C5C6C7C8C9");
        sb.append("CA6A6B6C6D6E6F707172CBCCCDCECFD0");
        sb.append("D17E737475767778797AD2D3D45BD6D7");
        sb.append("D8D9DADBDCDDDEDFE0E1E2E3E45DE6E7");
        sb.append("7B414243444546474849E8E9EAEBECED");
        sb.append("7D4A4B4C4D4E4F505152EEEFF0F1F2F3");
        sb.append("5C9F535455565758595AF4F5F6F7F8F9");
        sb.append("30313233343536373839FAFBFCFDFEFF");
        return sb.toString(); }

    public static byte[] hexToBytes(char[] hex) {
        int length = hex.length / 2;
        byte[] raw = new byte[length];
        for (int i = 0; i < length; i++) {
            int high = Character.digit(hex[i * 2], 16);
            int low = Character.digit(hex[i * 2 + 1], 16);
            int value = (high << 4) | low;
            if (value > 127) value -= 256; raw[i] = (byte) value; }
        return raw; }

    public static byte[] hexToBytes(String hex) { return hexToBytes(hex.toCharArray()); }

    /**
     * byte :: ASCII->EBCDIC
     */
    public static int ASCIIToEBCDIC(int ascii) {
        return AToE[ascii & 0xff] & 0xff;
    }

    /**
     * byte :: EBCDIC->ASCII
     */
    public static int EBCDICToASCII(int ebcdic) {
        return EToA[ebcdic & 0xff] & 0xff;
    }

    /**
     * byte[] :: ASCII->EBCDIC
     */
    public static byte[] ASCIIToEBCDIC(byte[] ascii) {
        byte[] tobytes = new byte[ascii.length];
        for (int i = 0; i < ascii.length; i++)
            tobytes[i] = (byte) ASCIIToEBCDIC(ascii[i]);
        return tobytes;
    }

    /**
     * 直接在原数据上修改
     * byte[] :: ASCII->EBCDIC
     */
    public static byte[] ASCIIToEBCDICFIX(byte[] ascii, int from) {
        for (int i = from; i < ascii.length; i++)
            ascii[i] = (byte) ASCIIToEBCDIC(ascii[i]);
        return ascii;
    }

    /**
     * byte[] :: EBCDIC->ASCII
     */
    public static byte[] EBCDICToASCII(byte[] ebcdic) {
        byte[] tobytes = new byte[ebcdic.length];
        for (int i = 0; i < ebcdic.length; i++)
            tobytes[i] = (byte) EBCDICToASCII(ebcdic[i]);
        return tobytes;
    }

    /**
     * byte[] :: EBCDIC->ASCII
     * 直接修改原数据
     */
    public static byte[] EBCDICToASCIIFIX(byte[] ebcdic, int from) {
        for (int i = from; i < ebcdic.length; i++)
            ebcdic[i] = (byte) EBCDICToASCII(ebcdic[i]);
        return ebcdic;
    }

    /**
     * String :: ASCII->EBCDIC
     */
    public static String ASCIIToEBCDIC(String ascii)
            throws Exception
    {
        return new String(ASCIIToEBCDIC(ascii.getBytes("iso-8859-1")), "iso-8859-1");
    }

    /**
     * String :: EBCDIC->ASCII
     */
    public static String EBCDICToASCII(String ebcdic)
            throws Exception
    {
        return new String(EBCDICToASCII(ebcdic.getBytes("iso-8859-1")),"iso-8859-1");
    }

    /**
     * File :: ASCII->EBCDIC
     */
    public static void ASCIIToEBCDIC(String fromfile, String tofile) {
        try {
            FileInputStream in = new FileInputStream(new File(fromfile));
            FileOutputStream out = new FileOutputStream(new File(tofile));
            int tempint, i = 0;
            byte[] tempbytes = new byte[in.available()];
            while ((tempint = in.read()) != -1)
                tempbytes[i++] = (byte) tempint;
            out.write(ASCIIToEBCDIC(tempbytes));
            in.close();
            out.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }

    /**
     * File :: EBCDIC->ASCII
     */
    public static void EBCDICToASCII(String fromfile, String tofile) {
        try {
            FileInputStream in = new FileInputStream(new File(fromfile));
            FileOutputStream out = new FileOutputStream(new File(tofile));
            int tempint, i = 0;
            byte[] tempbytes = new byte[in.available()];
            while ((tempint = in.read()) != -1)
                tempbytes[i++] = (byte) tempint;
            out.write(EBCDICToASCII(tempbytes));
            in.close();
            out.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }

    /**
     * 将证书前后加上begin和end，中间添加换行
     * @param certData
     * @return
     */
    public static String certAddHT(String certData) {
        final String head = "-----BEGIN CERTIFICATE-----\n";
        final String tail = "-----END CERTIFICATE-----";
        final String wrap = "\n";

        int num = certData.length() % 64 == 0 ? certData.length() / 64: certData.length() / 64 + 1;

        StringBuilder sb = new StringBuilder();
        sb.append(head);

        for (int i = 0; i < num; i++) {
            String substring;
            if (i == num - 1) {
                substring = certData.substring(i * 64);
            } else {
                substring = certData.substring(i * 64, (i + 1) * 64);
            }
            sb.append(substring).append(wrap);
        }
        sb.append(tail);

        return sb.toString();
    }

}