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using System;
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using System.IO;
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using System.Linq;
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namespace NullLib.HashCalc
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{
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    public class HashHelper
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    {
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        public static string CalcMd5x32(byte[] bytValue)
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        {
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            return CalcMd5x32(new MemoryStream(bytValue));
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        }
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        public static string CalcMd5x16(byte[] bytValue)
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        {
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            return CalcMd5x16(new MemoryStream(bytValue));
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        }
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        public static string CalcShax1(byte[] bytValue)
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        {
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            return CalcShax1(new MemoryStream(bytValue));
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        }
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        public static string CalcShax256(byte[] bytValue)
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        {
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            return CalcShax256(new MemoryStream(bytValue));
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        }
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        public static string CalcShax384(byte[] bytValue)
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        {
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            return CalcShax384(new MemoryStream(bytValue));
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        }
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        public static string CalcShax512(byte[] bytValue)
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        {
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            return CalcShax512(new MemoryStream(bytValue));
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        }
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        public static string CalcMd5x32(Stream stream)
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        {
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            var MD5CSP = new System.Security.Cryptography.MD5CryptoServiceProvider();
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            byte[] bytHash = MD5CSP.ComputeHash(stream);
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            MD5CSP.Clear();
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            string sHash = BytesToHex(bytHash);
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            return sHash;
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        }
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        public static string CalcMd5x16(Stream stream)
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        {
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            return CalcMd5x32(stream).Substring(8, 16);
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        }
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        public static string CalcShax1(Stream stream)
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        {
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            var SHA1CSP = new System.Security.Cryptography.SHA1CryptoServiceProvider();
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            byte[] bytHash = SHA1CSP.ComputeHash(stream);
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            SHA1CSP.Clear();
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            string sHash = BytesToHex(bytHash);
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            return sHash;
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        }
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        public static string CalcShax256(Stream stream)
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        {
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            var SHA256CSP = new System.Security.Cryptography.SHA256CryptoServiceProvider();
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            byte[] bytHash = SHA256CSP.ComputeHash(stream);
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            SHA256CSP.Clear();
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            string sHash = BytesToHex(bytHash);
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            return sHash;
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        }
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        public static string CalcShax384(Stream stream)
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        {
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            var SHA384CSP = new System.Security.Cryptography.SHA384CryptoServiceProvider();
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            byte[] bytHash = SHA384CSP.ComputeHash(stream);
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            SHA384CSP.Clear();
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            string sHash = BytesToHex(bytHash);
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            return sHash;
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        }
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        public static string CalcShax512(Stream stream)
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        {
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            var SHA512CSP = new System.Security.Cryptography.SHA512CryptoServiceProvider();
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            byte[] bytHash = SHA512CSP.ComputeHash(stream);
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            SHA512CSP.Clear();
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            string sHash = BytesToHex(bytHash);
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            return sHash;
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        }
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        public static string CalcCrcx32(Stream stream)
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        {
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            Crc32 calculator = new Crc32();
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            byte[] buffer = calculator.ComputeHash(stream);
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            calculator.Clear();
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            //将字节数组转换成十六进制的字符串形式
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            string sHash = BytesToHex(buffer);
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            return sHash;
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        }
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        private static string BytesToHex(byte[] array)
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        {
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            return string.Join(null, array.Select(v => Convert.ToString(v, 16).PadLeft(2, '0')));
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        }
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        /// <summary>
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        /// 提供 CRC32 算法的实现
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        /// </summary>
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        private class Crc32 : System.Security.Cryptography.HashAlgorithm
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        {
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            public const uint DefaultPolynomial = 0xedb88320;
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            public const uint DefaultSeed = 0xffffffff;
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            private uint hash;
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            private uint seed;
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            private uint[] table;
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            private static uint[] defaultTable;
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            public Crc32()
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            {
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                table = InitializeTable(DefaultPolynomial);
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                seed = DefaultSeed;
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                Initialize();
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            }
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            public Crc32(uint polynomial, uint seed)
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            {
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                table = InitializeTable(polynomial);
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                this.seed = seed;
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                Initialize();
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            }
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            public override void Initialize()
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            {
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                hash = seed;
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            }
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            protected override void HashCore(byte[] buffer, int start, int length)
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            {
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                hash = CalculateHash(table, hash, buffer, start, length);
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            }
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            protected override byte[] HashFinal()
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            {
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                byte[] hashBuffer = uintToBigEndianBytes(~hash);
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                this.HashValue = hashBuffer;
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                return hashBuffer;
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            }
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            public static uint Compute(byte[] buffer)
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            {
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                return ~CalculateHash(InitializeTable(DefaultPolynomial), DefaultSeed, buffer, 0, buffer.Length);
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            }
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            public static uint Compute(uint seed, byte[] buffer)
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            {
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                return ~CalculateHash(InitializeTable(DefaultPolynomial), seed, buffer, 0, buffer.Length);
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            }
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            public static uint Compute(uint polynomial, uint seed, byte[] buffer)
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            {
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                return ~CalculateHash(InitializeTable(polynomial), seed, buffer, 0, buffer.Length);
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            }
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            private static uint[] InitializeTable(uint polynomial)
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            {
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                if (polynomial == DefaultPolynomial && defaultTable != null)
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                {
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                    return defaultTable;
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                }
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                uint[] createTable = new uint[256];
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                for (int i = 0; i < 256; i++)
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                {
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                    uint entry = (uint)i;
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                    for (int j = 0; j < 8; j++)
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                    {
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                        if ((entry & 1) == 1)
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                            entry = (entry >> 1) ^ polynomial;
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                        else
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                            entry = entry >> 1;
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                    }
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                    createTable[i] = entry;
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                }
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                if (polynomial == DefaultPolynomial)
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                {
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                    defaultTable = createTable;
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                }
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                return createTable;
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            }
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            private static uint CalculateHash(uint[] table, uint seed, byte[] buffer, int start, int size)
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            {
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                uint crc = seed;
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                for (int i = start; i < size; i++)
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                {
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                    unchecked
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                    {
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                        crc = (crc >> 8) ^ table[buffer[i] ^ crc & 0xff];
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                    }
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                }
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                return crc;
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            }
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            private byte[] uintToBigEndianBytes(uint x)
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            {
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                return new byte[] { (byte)((x >> 24) & 0xff), (byte)((x >> 16) & 0xff), (byte)((x >> 8) & 0xff), (byte)(x & 0xff) };
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            }
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        }
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    }
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}