package com.anyun.h264.util;

import java.lang.reflect.Array;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Stream;

public final class BytesUtils {
	public static String bytesToHexString(byte[] src,int len){  
		return bytesToHexString(src,0,len);
	}
	public static String bytesToHexString(byte[] src){  
		return bytesToHexString(src,0,src.length);
	}
	public static String byteToHexString(byte b)
	{
		int v = b & 0xFF;  
        return Integer.toHexString(v);  
	}

	public static float bytesToFloat(byte[] src, int start, int len) {
		ByteBuffer buffer = ByteBuffer.wrap(src, start, len);
		return buffer.getFloat();
	}

	public static String bytesToHexString(byte[] src,int start,int len){  
	    StringBuilder stringBuilder = new StringBuilder("");  
	    if (src == null || src.length <= 0) {  
	        return null;  
	    }  
	    for (int i = start; i < start + len; i++) {
	        int v = src[i] & 0xFF;  
	        String hv = Integer.toHexString(v);  
	        if (hv.length() < 2) {  
	            stringBuilder.append(0);  
	        }  
	        stringBuilder.append(hv);   
	    }  
	    return stringBuilder.toString().toUpperCase();  
	}  
	public static byte[] hexStringToBytes(String hexString) {  
	    if (hexString == null || hexString.equals("")) {  
	        return null;  
	    }
	    hexString = hexString.toUpperCase();  
	    int length = hexString.length() / 2;  
	    char[] hexChars = hexString.toCharArray();  
	    byte[] d = new byte[length];  
	    for (int i = 0; i < length; i++) {  
	        int pos = i * 2;  
	        d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));  
	    }  
	    return d;  
	}  
	private static byte charToByte(char c) {  
	    return (byte) "0123456789ABCDEF".indexOf(c);  
	}

	public static byte xor(byte[] bytes,int start,int size)
	{
		if (bytes.length < size)
		{
			throw new RuntimeException("计算xor的时候size不足");
		}
		int s1 = bytes[start];
		for (int i = start + 1; i < size; i++)
		{
			s1 = s1 ^ bytes[i];
		}
		return (byte)s1;
	}

	public static int ccitt(byte[] data, int start, int size) {
		final int []table = {0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5,
				0x60c6, 0x70e7, 0x8108, 0x9129, 0xa14a, 0xb16b,
				0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210,
				0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
				0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c,
				0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401,
				0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b,
				0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
				0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6,
				0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738,
				0xf7df, 0xe7fe, 0xd79d, 0xc7bc, 0x48c4, 0x58e5,
				0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
				0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969,
				0xa90a, 0xb92b, 0x5af5, 0x4ad4, 0x7ab7, 0x6a96,
				0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc,
				0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
				0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03,
				0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd,
				0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6,
				0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
				0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a,
				0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb,
				0xd10c, 0xc12d, 0xf14e, 0xe16f, 0x1080, 0x00a1,
				0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
				0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c,
				0xe37f, 0xf35e, 0x02b1, 0x1290, 0x22f3, 0x32d2,
				0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb,
				0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
				0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447,
				0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8,
				0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2,
				0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
				0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9,
				0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827,
				0x18c0, 0x08e1, 0x3882, 0x28a3, 0xcb7d, 0xdb5c,
				0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
				0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0,
				0x2ab3, 0x3a92, 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d,
				0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07,
				0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
				0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba,
				0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74,
				0x2e93, 0x3eb2, 0x0ed1, 0x1ef0};
		int crc = 0;
		int finall = 0;

		for (int i = start; i < start + size; i++) {
			int temp = (data[i] ^ (crc >> 8)) & 0xff;
			crc = table[temp] ^ (crc << 8);
		}

		return crc ^ finall;
	}

	public static byte xor(byte[] bytes)
	{
		return xor(bytes,0,bytes.length);
	}
	public static String toHexString(byte b)
	{
		String hex = Integer.toHexString(b&0xff).toUpperCase();
		if(hex.length()==1)
		{
			return "0"+hex;
		}
		return hex;
	}
	
	public static int Sum(byte[] bytes)
	{
		int sum = 0;
		for(byte b:bytes)
		{
			sum+=b;
		}
		return sum;
	}

	public static boolean isAllZero(byte[] bytes)
	{
		for (byte b:bytes) {
			if (b != 0) {
				return false;
			}
		}
		return true;
	}

	public static int getInt32(byte[] bytes,int start){  
        int result = 0;
        int a = (bytes[0+start] & 0xff) << 24;
        int b = (bytes[1+start] & 0xff) << 16;  
        int c = (bytes[2+start] & 0xff) << 8;  
        int d = (bytes[3+start] & 0xff);  
        result = a | b | c | d;
        return result;  
    }

    public static byte[] subArray(byte[] array,int start,int len)
	{
		byte[] result = new byte[len];
		System.arraycopy(array,start,result,0,len);
		return result;
	}

	private static int findPos(byte[] array,byte find,int start)
	{
		for(int i=start;i<array.length;i++)
		{
			if(array[i]==find) return i;
		}
		return -1;
	}

	public static List<byte[]> splitArray(byte[] bytes, byte spliter)
	{
        ArrayList<byte[]> list = new ArrayList();
        int start = 0;
		while (true) {
			int pos = findPos(bytes, spliter,start);
            if(pos>=0)
            {
                byte[] findbytes = subArray(bytes,start,pos - start);
                list.add(findbytes);
				start = pos + 1;
            }
            else
            {
                break;
            }
        }
        //添加最后一个数组
		byte[] findbytes = subArray(bytes,start,bytes.length - start);
		list.add(findbytes);
		return list;
	}
}