实例介绍
【实例简介】
【实例截图】
【核心代码】
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
}
}
标签： C#
LumiSoft.Net网络编程最全的类(c#)含http tcp udp ftp rtp pop3 mime imap icmp mail smtp
好例子网口号：伸出你的我的手 — 分享！
相关软件
小贴士
感谢您为本站写下的评论，您的评论对其它用户来说具有重要的参考价值，所以请认真填写。
- 类似“顶”、“沙发”之类没有营养的文字，对勤劳贡献的楼主来说是令人沮丧的反馈信息。
- 相信您也不想看到一排文字/表情墙，所以请不要反馈意义不大的重复字符，也请尽量不要纯表情的回复。
- 提问之前请再仔细看一遍楼主的说明，或许是您遗漏了。
- 请勿到处挖坑绊人、招贴广告。既占空间让人厌烦，又没人会搭理，于人于己都无利。
关于好例子网
本站旨在为广大IT学习爱好者提供一个非营利性互相学习交流分享平台。本站所有资源都可以被免费获取学习研究。本站资源来自网友分享，对搜索内容的合法性不具有预见性、识别性、控制性，仅供学习研究，请务必在下载后24小时内给予删除，不得用于其他任何用途，否则后果自负。基于互联网的特殊性，平台无法对用户传输的作品、信息、内容的权属或合法性、安全性、合规性、真实性、科学性、完整权、有效性等进行实质审查；无论平台是否已进行审查，用户均应自行承担因其传输的作品、信息、内容而可能或已经产生的侵权或权属纠纷等法律责任。本站所有资源不代表本站的观点或立场，基于网友分享，根据中国法律《信息网络传播权保护条例》第二十二与二十三条之规定，若资源存在侵权或相关问题请联系本站客服人员，点此联系我们。关于更多版权及免责申明参见 版权及免责申明
网友评论
我要评论