实例介绍
【实例简介】
【实例截图】
【核心代码】
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 | using System;using System.IO;using System.Collections.Generic;using System.Text;using System.Net;using System.Net.Sockets;using LumiSoft.Net.IO;namespace LumiSoft.Net{ /// <summary> /// Common utility methods. /// </summary> public class Net_Utils { #region static method GetLocalHostName /// <summary> /// Gets local host name or argument <b>hostName</b> value if it's specified. /// </summary> /// <param name="hostName">Host name or null.</param> /// <returns>Returns local host name or argument <b>hostName</b> value if it's specified.</returns> public static string GetLocalHostName(string hostName) { if(string.IsNullOrEmpty(hostName)){ return System.Net.Dns.GetHostName(); } else{ return hostName; } } #endregion #region static method CompareArray /// <summary> /// Compares if specified array itmes equals. /// </summary> /// <param name="array1">Array 1.</param> /// <param name="array2">Array 2</param> /// <returns>Returns true if both arrays are equal.</returns> public static bool CompareArray(Array array1,Array array2) { return CompareArray(array1,array2,array2.Length); } /// <summary> /// Compares if specified array itmes equals. /// </summary> /// <param name="array1">Array 1.</param> /// <param name="array2">Array 2</param> /// <param name="array2Count">Number of bytes in array 2 used for compare.</param> /// <returns>Returns true if both arrays are equal.</returns> public static bool CompareArray(Array array1,Array array2,int array2Count) { if(array1 == null && array2 == null){ return true; } if(array1 == null && array2 != null){ return false; } if(array1 != null && array2 == null){ return false; } if(array1.Length != array2Count){ return false; } else{ for(int i=0;i<array1.Length;i ){ if(!array1.GetValue(i).Equals(array2.GetValue(i))){ return false; } } } return true; } #endregion #region static method ReverseArray /// <summary> /// Reverses the specified array elements. /// </summary> /// <param name="array">Array elements to reverse.</param> /// <returns>Returns array with reversed items.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>array</b> is null.</exception> public static Array ReverseArray(Array array) { if(array == null){ throw new ArgumentNullException("array"); } Array.Reverse(array); return array; } #endregion #region static method ArrayToString /// <summary> /// Convert array elements to string. /// </summary> /// <param name="values">String values.</param> /// <param name="delimiter">Values delimiter.</param> /// <returns>Returns array elements as string.</returns> public static string ArrayToString(string[] values,string delimiter) { if(values == null){ return ""; } StringBuilder retVal = new StringBuilder(); for(int i=0;i<values.Length;i ){ if(i > 0){ retVal.Append(delimiter); } retVal.Append(values[i]); } return retVal.ToString(); } #endregion #region static method StreamCopy /// <summary> /// Copies <b>source</b> stream data to <b>target</b> stream. /// </summary> /// <param name="source">Source stream. Reading starts from stream current position.</param> /// <param name="target">Target stream. Writing starts from stream current position.</param> /// <param name="blockSize">Specifies transfer block size in bytes.</param> /// <returns>Returns number of bytes copied.</returns> public static long StreamCopy(Stream source,Stream target,int blockSize) { if(source == null){ throw new ArgumentNullException("source"); } if(target == null){ throw new ArgumentNullException("target"); } if(blockSize < 1024){ throw new ArgumentException("Argument 'blockSize' value must be >= 1024."); } byte[] buffer = new byte[blockSize]; long totalReaded = 0; while(true){ int readedCount = source.Read(buffer,0,buffer.Length); // We reached end of stream, we readed all data sucessfully. if(readedCount == 0){ return totalReaded; } else{ target.Write(buffer,0,readedCount); totalReaded = readedCount; } } } #endregion #region static method CompareIP /// <summary> /// Compares 2 IP addresses. Returns 0 if IPs are equal, /// returns positive value if destination IP is bigger than source IP, /// returns negative value if destination IP is smaller than source IP. /// </summary> /// <param name="source">Source IP address.</param> /// <param name="destination">Destination IP address.</param> /// <returns>Returns 0 if IPs are equal, /// returns positive value if destination IP is bigger than source IP, /// returns negative value if destination IP is smaller than source IP. /// </returns> public static int CompareIP(IPAddress source,IPAddress destination) { byte[] sourceIpBytes = source.GetAddressBytes(); byte[] destinationIpBytes = destination.GetAddressBytes(); // IPv4 and IPv6 if(sourceIpBytes.Length < destinationIpBytes.Length){ return 1; } // IPv6 and IPv4 else if(sourceIpBytes.Length > destinationIpBytes.Length){ return -1; } // IPv4 and IPv4 OR IPv6 and IPv6 else{ for(int i=0;i<sourceIpBytes.Length;i ){ if(sourceIpBytes[i] < destinationIpBytes[i]){ return 1; } else if(sourceIpBytes[i] > destinationIpBytes[i]){ return -1; } } return 0; } } #endregion #region static method IsIPAddress /// <summary> /// Gets if the specified string value is IP address. /// </summary> /// <param name="value">Value to check.</param> /// <returns>Returns true if specified value is IP address.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>value</b> is null reference.</exception> public static bool IsIPAddress(string value) { if(value == null){ throw new ArgumentNullException("value"); } IPAddress ip = null; return IPAddress.TryParse(value,out ip); } #endregion #region static method IsMulticastAddress /// <summary> /// Gets if the specified IP address is multicast address. /// </summary> /// <param name="ip">IP address.</param> /// <returns>Returns true if <b>ip</b> is muticast address, otherwise false.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>ip</b> s null reference.</exception> public static bool IsMulticastAddress(IPAddress ip) { if(ip == null){ throw new ArgumentNullException("ip"); } // IPv4 multicast 224.0.0.0 to 239.255.255.255 if(ip.IsIPv6Multicast){ return true; } else if(ip.AddressFamily == AddressFamily.InterNetwork){ byte[] bytes = ip.GetAddressBytes(); if(bytes[0] >= 224 && bytes[0] <= 239){ return true; } } return false; } #endregion #region static method IsPrivateIP /// <summary> /// Gets if specified IP address is private LAN IP address. For example 192.168.x.x is private ip. /// </summary> /// <param name="ip">IP address to check.</param> /// <exception cref="ArgumentNullException">Is raised when <b>ip</b> is null reference.</exception> /// <returns>Returns true if IP is private IP.</returns> public static bool IsPrivateIP(string ip) { if(ip == null){ throw new ArgumentNullException("ip"); } return IsPrivateIP(IPAddress.Parse(ip)); } /// <summary> /// Gets if specified IP address is private LAN IP address. For example 192.168.x.x is private ip. /// </summary> /// <param name="ip">IP address to check.</param> /// <returns>Returns true if IP is private IP.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>ip</b> is null reference.</exception> public static bool IsPrivateIP(IPAddress ip) { if(ip == null){ throw new ArgumentNullException("ip"); } if(ip.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork){ byte[] ipBytes = ip.GetAddressBytes(); /* Private IPs: First Octet = 192 AND Second Octet = 168 (Example: 192.168.X.X) First Octet = 172 AND (Second Octet >= 16 AND Second Octet <= 31) (Example: 172.16.X.X - 172.31.X.X) First Octet = 10 (Example: 10.X.X.X) First Octet = 169 AND Second Octet = 254 (Example: 169.254.X.X) */ if(ipBytes[0] == 192 && ipBytes[1] == 168){ return true; } if(ipBytes[0] == 172 && ipBytes[1] >= 16 && ipBytes[1] <= 31){ return true; } if(ipBytes[0] == 10){ return true; } if(ipBytes[0] == 169 && ipBytes[1] == 254){ return true; } } return false; } #endregion #region static method ParseIPEndPoint /// <summary> /// Parses IPEndPoint from the specified string value. /// </summary> /// <param name="value">IPEndPoint string value.</param> /// <returns>Returns parsed IPEndPoint.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>value</b> is null reference.</exception> /// <exception cref="ArgumentException">Is raised when any of the arguments has invalid value.</exception> public static IPEndPoint ParseIPEndPoint(string value) { if(value == null){ throw new ArgumentNullException("value"); } try{ string[] ip_port = value.Split(':'); return new IPEndPoint(IPAddress.Parse(ip_port[0]),Convert.ToInt32(ip_port[1])); } catch(Exception x){ throw new ArgumentException("Invalid IPEndPoint value.","value",x); } } #endregion #region static method IsInteger /// <summary> /// Checks if specified string is integer(int/long). /// </summary> /// <param name="value"></param> /// <returns>Returns true if specified string is integer.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>value</b> is null reference.</exception> public static bool IsInteger(string value) { if(value == null){ throw new ArgumentNullException("value"); } long l = 0; return long.TryParse(value,out l); } #endregion #region static method IsAscii /// <summary> /// Gets if the specified string is ASCII string. /// </summary> /// <param name="value">String value.</param> /// <returns>Returns true if specified string is ASCII string, otherwise false.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>value</b> is null reference.</exception> public static bool IsAscii(string value) { if(value == null){ throw new ArgumentNullException("value"); } foreach(char c in value){ if((int)c > 127){ return false; } } return true; } #endregion #region static method IsSocketAsyncSupported /// <summary> /// Gets if socket async methods supported by OS. /// </summary> /// <returns>returns ture if supported, otherwise false.</returns> public static bool IsSocketAsyncSupported() { try{ using(SocketAsyncEventArgs e = new SocketAsyncEventArgs()){ return true; } } catch(NotSupportedException nX){ string dummy = nX.Message; return false; } } #endregion #region static method CreateSocket /// <summary> /// Creates new socket for the specified end point. /// </summary> /// <param name="localEP">Local end point.</param> /// <param name="protocolType">Protocol type.</param> /// <returns>Retruns newly created socket.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>localEP</b> is null reference.</exception> public static Socket CreateSocket(IPEndPoint localEP,ProtocolType protocolType) { if(localEP == null){ throw new ArgumentNullException("localEP"); } SocketType socketType = SocketType.Stream; if(protocolType == ProtocolType.Udp){ socketType = SocketType.Dgram; } if(localEP.AddressFamily == AddressFamily.InterNetwork){ Socket socket = new Socket(AddressFamily.InterNetwork,socketType,protocolType); socket.Bind(localEP); return socket; } else if(localEP.AddressFamily == AddressFamily.InterNetworkV6){ Socket socket = new Socket(AddressFamily.InterNetworkV6,socketType,protocolType); socket.Bind(localEP); return socket; } else{ throw new ArgumentException("Invalid IPEndPoint address family."); } } #endregion #region static method ToHex /// <summary> /// Converts specified data to HEX string. /// </summary> /// <param name="data">Data to convert.</param> /// <returns>Returns hex string.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>data</b> is null reference.</exception> public static string ToHex(byte[] data) { if(data == null){ throw new ArgumentNullException("data"); } return BitConverter.ToString(data).ToLower().Replace("-",""); } /// <summary> /// Converts specified string to HEX string. /// </summary> /// <param name="text">String to convert.</param> /// <returns>Returns hex string.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>text</b> is null reference.</exception> public static string ToHex(string text) { if(text == null){ throw new ArgumentNullException("text"); } return BitConverter.ToString(Encoding.Default.GetBytes(text)).ToLower().Replace("-",""); } #endregion #region static method FromHex /// <summary> /// Converts hex byte data to normal byte data. Hex data must be in two bytes pairs, for example: 0F,FF,A3,... . /// </summary> /// <param name="hexData">Hex data.</param> /// <returns>Returns decoded data.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>hexData</b> is null reference.</exception> public static byte[] FromHex(byte[] hexData) { if(hexData == null){ throw new ArgumentNullException("hexData"); } if(hexData.Length < 2 || (hexData.Length / (double)2 != Math.Floor(hexData.Length / (double)2))){ throw new Exception("Illegal hex data, hex data must be in two bytes pairs, for example: 0F,FF,A3,... ."); } MemoryStream retVal = new MemoryStream(hexData.Length / 2); // Loop hex value pairs for(int i=0;i<hexData.Length;i =2){ byte[] hexPairInDecimal = new byte[2]; // We need to convert hex char to decimal number, for example F = 15 for(int h=0;h<2;h ){ if(((char)hexData[i h]) == '0'){ hexPairInDecimal[h] = 0; } else if(((char)hexData[i h]) == '1'){ hexPairInDecimal[h] = 1; } else if(((char)hexData[i h]) == '2'){ hexPairInDecimal[h] = 2; } else if(((char)hexData[i h]) == '3'){ hexPairInDecimal[h] = 3; } else if(((char)hexData[i h]) == '4'){ hexPairInDecimal[h] = 4; } else if(((char)hexData[i h]) == '5'){ hexPairInDecimal[h] = 5; } else if(((char)hexData[i h]) == '6'){ hexPairInDecimal[h] = 6; } else if(((char)hexData[i h]) == '7'){ hexPairInDecimal[h] = 7; } else if(((char)hexData[i h]) == '8'){ hexPairInDecimal[h] = 8; } else if(((char)hexData[i h]) == '9'){ hexPairInDecimal[h] = 9; } else if(((char)hexData[i h]) == 'A' || ((char)hexData[i h]) == 'a'){ hexPairInDecimal[h] = 10; } else if(((char)hexData[i h]) == 'B' || ((char)hexData[i h]) == 'b'){ hexPairInDecimal[h] = 11; } else if(((char)hexData[i h]) == 'C' || ((char)hexData[i h]) == 'c'){ hexPairInDecimal[h] = 12; } else if(((char)hexData[i h]) == 'D' || ((char)hexData[i h]) == 'd'){ hexPairInDecimal[h] = 13; } else if(((char)hexData[i h]) == 'E' || ((char)hexData[i h]) == 'e'){ hexPairInDecimal[h] = 14; } else if(((char)hexData[i h]) == 'F' || ((char)hexData[i h]) == 'f'){ hexPairInDecimal[h] = 15; } } // Join hex 4 bit(left hex cahr) 4bit(right hex char) in bytes 8 it retVal.WriteByte((byte)((hexPairInDecimal[0] << 4) | hexPairInDecimal[1])); } return retVal.ToArray(); } #endregion #region static method FromBase64 /// <summary> /// Decodes specified base64 data. /// </summary> /// <param name="data">Base64 string.</param> /// <returns>Returns decoded data.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>data</b> is null reference.</exception> public static byte[] FromBase64(string data) { if(data == null){ throw new ArgumentNullException("data"); } Base64 base64 = new Base64(); return base64.Decode(data,true); } /// <summary> /// Decodes specified base64 data. /// </summary> /// <param name="data">Base64 data.</param> /// <returns>Returns decoded data.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>data</b> is null reference.</exception> public static byte[] FromBase64(byte[] data) { if(data == null){ throw new ArgumentNullException("data"); } Base64 base64 = new Base64(); return base64.Decode(data,0,data.Length,true); } #endregion #region static method Base64Encode /// <summary> /// Encodes specified data with base64 encoding. /// </summary> /// <param name="data">Data to encode.</param> /// <returns></returns> public static byte[] Base64Encode(byte[] data) { return Base64EncodeEx(data,null,true); } /// <summary> /// Encodes specified data with bas64 encoding. /// </summary> /// <param name="data">Data to to encode.</param> /// <param name="base64Chars">Custom base64 chars (64 chars) or null if default chars used.</param> /// <param name="padd">Padd missing block chars. Normal base64 must be 4 bytes blocks, if not 4 bytes in block, /// missing bytes must be padded with '='. Modified base64 just skips missing bytes.</param> /// <returns></returns> public static byte[] Base64EncodeEx(byte[] data,char[] base64Chars,bool padd) { /* RFC 2045 6.8. Base64 Content-Transfer-Encoding Base64 is processed from left to right by 4 6-bit byte block, 4 6-bit byte block are converted to 3 8-bit bytes. If base64 4 byte block doesn't have 3 8-bit bytes, missing bytes are marked with =. Value Encoding Value Encoding Value Encoding Value Encoding 0 A 17 R 34 i 51 z 1 B 18 S 35 j 52 0 2 C 19 T 36 k 53 1 3 D 20 U 37 l 54 2 4 E 21 V 38 m 55 3 5 F 22 W 39 n 56 4 6 G 23 X 40 o 57 5 7 H 24 Y 41 p 58 6 8 I 25 Z 42 q 59 7 9 J 26 a 43 r 60 8 10 K 27 b 44 s 61 9 11 L 28 c 45 t 62 12 M 29 d 46 u 63 / 13 N 30 e 47 v 14 O 31 f 48 w (pad) = 15 P 32 g 49 x 16 Q 33 h 50 y NOTE: 4 base64 6-bit bytes = 3 8-bit bytes // | 6-bit | 6-bit | 6-bit | 6-bit | // | 1 2 3 4 5 6 | 1 2 3 4 5 6 | 1 2 3 4 5 6 | 1 2 3 4 5 6 | // | 8-bit | 8-bit | 8-bit | */ if(base64Chars != null && base64Chars.Length != 64){ throw new Exception("There must be 64 chars in base64Chars char array !"); } if(base64Chars == null){ base64Chars = new char[]{ 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z', 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z', '0','1','2','3','4','5','6','7','8','9',' ','/' }; } // Convert chars to bytes byte[] base64LoockUpTable = new byte[64]; for(int i=0;i<64;i ){ base64LoockUpTable[i] = (byte)base64Chars[i]; } int encodedDataLength = (int)Math.Ceiling((data.Length * 8) / (double)6); // Retrun value won't be interegral 4 block, but has less. Padding requested, padd missing with '=' if(padd && (encodedDataLength / (double)4 != Math.Ceiling(encodedDataLength / (double)4))){ encodedDataLength = (int)(Math.Ceiling(encodedDataLength / (double)4) * 4) - encodedDataLength; } // See how many line brakes we need int numberOfLineBreaks = 0; if(encodedDataLength > 76){ numberOfLineBreaks = (int)Math.Ceiling(encodedDataLength / (double)76) - 1; } // Construc return valu buffer byte[] retVal = new byte[encodedDataLength (numberOfLineBreaks * 2)]; // * 2 - CRLF int lineBytes = 0; // Loop all 3 bye blocks int position = 0; for(int i=0;i<data.Length;i =3){ // Do line splitting if(lineBytes >= 76){ retVal[position 0] = (byte)'\r'; retVal[position 1] = (byte)'\n'; position = 2; lineBytes = 0; } // Full 3 bytes data block if((data.Length - i) >= 3){ retVal[position 0] = base64LoockUpTable[data[i 0] >> 2]; retVal[position 1] = base64LoockUpTable[(data[i 0] & 0x3) << 4 | data[i 1] >> 4]; retVal[position 2] = base64LoockUpTable[(data[i 1] & 0xF) << 2 | data[i 2] >> 6]; retVal[position 3] = base64LoockUpTable[data[i 2] & 0x3F]; position = 4; lineBytes = 4; } // 2 bytes data block, left (last block) else if((data.Length - i) == 2){ retVal[position 0] = base64LoockUpTable[data[i 0] >> 2]; retVal[position 1] = base64LoockUpTable[(data[i 0] & 0x3) << 4 | data[i 1] >> 4]; retVal[position 2] = base64LoockUpTable[(data[i 1] & 0xF) << 2]; if(padd){ retVal[position 3] = (byte)'='; } } // 1 bytes data block, left (last block) else if((data.Length - i) == 1){ retVal[position 0] = base64LoockUpTable[data[i 0] >> 2]; retVal[position 1] = base64LoockUpTable[(data[i 0] & 0x3) << 4]; if(padd){ retVal[position 2] = (byte)'='; retVal[position 3] = (byte)'='; } } } return retVal; } #endregion #region static method Base64Decode /// <summary> /// Decodes base64 data. Defined in RFC 2045 6.8. Base64 Content-Transfer-Encoding. /// </summary> /// <param name="base64Data">Base64 decoded data.</param> /// <param name="base64Chars">Custom base64 chars (64 chars) or null if default chars used.</param> /// <returns></returns> public static byte[] Base64DecodeEx(byte[] base64Data,char[] base64Chars) { /* RFC 2045 6.8. Base64 Content-Transfer-Encoding Base64 is processed from left to right by 4 6-bit byte block, 4 6-bit byte block are converted to 3 8-bit bytes. If base64 4 byte block doesn't have 3 8-bit bytes, missing bytes are marked with =. Value Encoding Value Encoding Value Encoding Value Encoding 0 A 17 R 34 i 51 z 1 B 18 S 35 j 52 0 2 C 19 T 36 k 53 1 3 D 20 U 37 l 54 2 4 E 21 V 38 m 55 3 5 F 22 W 39 n 56 4 6 G 23 X 40 o 57 5 7 H 24 Y 41 p 58 6 8 I 25 Z 42 q 59 7 9 J 26 a 43 r 60 8 10 K 27 b 44 s 61 9 11 L 28 c 45 t 62 12 M 29 d 46 u 63 / 13 N 30 e 47 v 14 O 31 f 48 w (pad) = 15 P 32 g 49 x 16 Q 33 h 50 y NOTE: 4 base64 6-bit bytes = 3 8-bit bytes // | 6-bit | 6-bit | 6-bit | 6-bit | // | 1 2 3 4 5 6 | 1 2 3 4 5 6 | 1 2 3 4 5 6 | 1 2 3 4 5 6 | // | 8-bit | 8-bit | 8-bit | */ if(base64Chars != null && base64Chars.Length != 64){ throw new Exception("There must be 64 chars in base64Chars char array !"); } if(base64Chars == null){ base64Chars = new char[]{ 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z', 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z', '0','1','2','3','4','5','6','7','8','9',' ','/' }; } //--- Create decode table ---------------------// byte[] decodeTable = new byte[128]; for(int i=0;i<128;i ){ int mappingIndex = -1; for(int bc=0;bc<base64Chars.Length;bc ){ if(i == base64Chars[bc]){ mappingIndex = bc; break; } } if(mappingIndex > -1){ decodeTable[i] = (byte)mappingIndex; } else{ decodeTable[i] = 0xFF; } } //---------------------------------------------// byte[] decodedDataBuffer = new byte[((base64Data.Length * 6) / 8) 4]; int decodedBytesCount = 0; int nByteInBase64Block = 0; byte[] decodedBlock = new byte[3]; byte[] base64Block = new byte[4]; for(int i=0;i<base64Data.Length;i ){ byte b = base64Data[i]; // Read 4 byte base64 block and process it // Any characters outside of the base64 alphabet are to be ignored in base64-encoded data. // Padding char if(b == '='){ base64Block[nByteInBase64Block] = 0xFF; } else{ byte decodeByte = decodeTable[b & 0x7F]; if(decodeByte != 0xFF){ base64Block[nByteInBase64Block] = decodeByte; nByteInBase64Block ; } } /* Check if we can decode some bytes. * We must have full 4 byte base64 block or reached at the end of data. */ int encodedBytesCount = -1; // We have full 4 byte base64 block if(nByteInBase64Block == 4){ encodedBytesCount = 3; } // We have reached at the end of base64 data, there may be some bytes left else if(i == base64Data.Length - 1){ // Invalid value, we can't have only 6 bit, just skip if(nByteInBase64Block == 1){ encodedBytesCount = 0; } // There is 1 byte in two base64 bytes (6 2 bit) else if(nByteInBase64Block == 2){ encodedBytesCount = 1; } // There are 2 bytes in two base64 bytes ([6 2],[4 4] bit) else if(nByteInBase64Block == 3){ encodedBytesCount = 2; } } // We have some bytes available to decode, decode them if(encodedBytesCount > -1){ decodedDataBuffer[decodedBytesCount 0] = (byte)((int)base64Block[0] << 2 | (int)base64Block[1] >> 4); decodedDataBuffer[decodedBytesCount 1] = (byte)(((int)base64Block[1] & 0xF) << 4 | (int)base64Block[2] >> 2); decodedDataBuffer[decodedBytesCount 2] = (byte)(((int)base64Block[2] & 0x3) << 6 | (int)base64Block[3] >> 0); // Increase decoded bytes count decodedBytesCount = encodedBytesCount; // Reset this block, reade next if there is any nByteInBase64Block = 0; } } // There is some decoded bytes, construct return value if(decodedBytesCount > -1){ byte[] retVal = new byte[decodedBytesCount]; Array.Copy(decodedDataBuffer,0,retVal,0,decodedBytesCount); return retVal; } // There is no decoded bytes else{ return new byte[0]; } } #endregion #region static method ComputeMd5 /// <summary> /// Computes md5 hash. /// </summary> /// <param name="text">Text to hash.</param> /// <param name="hex">Specifies if md5 value is returned as hex string.</param> /// <returns>Returns md5 value or md5 hex value.</returns> /// <exception cref="ArgumentNullException">Is raised when <b>text</b> is null reference.</exception> public static string ComputeMd5(string text,bool hex) { if(text == null){ throw new ArgumentNullException("text"); } System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider(); byte[] hash = md5.ComputeHash(Encoding.Default.GetBytes(text)); if(hex){ return ToHex(hash).ToLower(); } else{ return System.Text.Encoding.Default.GetString(hash); } } #endregion //--- Obsolte ------------------------------------------------------------------ #region static method IsIoCompletionPortsSupported /// <summary> /// Gets if IO completion ports supported by OS. /// </summary> /// <returns></returns> [Obsolete("Use method 'IsSocketAsyncSupported' instead.")] public static bool IsIoCompletionPortsSupported() { try{ using(SocketAsyncEventArgs e = new SocketAsyncEventArgs()){ return true; } } catch(NotSupportedException nX){ string dummy = nX.Message; return false; } } #endregion }} |
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