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一、编码规则
Message)
{ char[] Base64Code=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','+','/','='}; byte empty=(byte)0; System.Collections.ArrayList byteMessage=new System.Collections.ArrayList(System.Text.Encoding.Default.GetBytes(Message)); System.Text.StringBuilder outmessage; int messageLen=byteMessage.Count; int page=messageLen/3; int use=0; if((use=messageLen%3)>0) { for(int i=0;i<3-use;i++) byteMessage.Add(empty); page++; } outmessage=new System.Text.StringBuilder(page*4); for(int i=0;i<page;i++) { byte[] instr = new byte[3]; instr[0]=(byte)byteMessage[i*3]; instr[1]=(byte)byteMessage[i*3+1]; instr[2]=(byte)byteMessage[i*3+2]; int[] outstr=new int[4]; outstr[0]=instr[0]>>2; outstr[1]=((instr[0]&0x03)<<4)^(instr[1]>>4); if(!instr[1].Equals(empty)) outstr[2]=((instr[1]&0x0f)<<2)^(instr[2]>>6); else outstr[2]=64; if(!instr[2].Equals(empty)) outstr[3]=(instr[2]&0x3f); else outstr[3]=64; outmessage.Append(Base64Code[outstr[0]]); outmessage.Append(Base64Code[outstr[1]]); outmessage.Append(Base64Code[outstr[2]]); outmessage.Append(Base64Code[outstr[3]]); } return outmessage.ToString(); } public static string Base64Decode(string Message){ if((Message.Length%4)!=0){ throw new ArgumentException("不是正确的BASE64编码,请检查。","Message"); } if(!System.Text.RegularExpressions.Regex.IsMatch(Message,"^[A-Z0-9/+=]*$",System.Text.RegularExpressions.RegexOptions.IgnoreCase)){ throw new ArgumentException("包含不正确的BASE64编码,请检查。","Message"); } string Base64Code="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; int page=Message.Length/4; System.Collections.ArrayList outMessage=new System.Collections.ArrayList(page*3); char[] message=Message.ToCharArray(); for(int i=0;i<page;i++) { byte[] instr=new byte[4]; instr[0]=(byte)Base64Code.IndexOf(message[i*4]); instr[1]=(byte)Base64Code.IndexOf(message[i*4+1]); instr[2]=(byte)Base64Code.IndexOf(message[i*4+2]); instr[3]=(byte)Base64Code.IndexOf(message[i*4+3]); byte[] outstr=new byte[3]; outstr[0]=(byte)((instr[0]<<2)^((instr[1]&0x30)>>4)); if(instr[2]!=64) { outstr[1]=(byte)((instr[1]<<4)^((instr[2]&0x3c)>>2)); } else { outstr[2]=0; } if(instr[3]!=64) { outstr[2]=(byte)((instr[2]<<6)^instr[3]); } else { outstr[2]=0; } outMessage.Add(outstr[0]); if(outstr[1]!=0) outMessage.Add(outstr[1]); if(outstr[2]!=0) outMessage.Add(outstr[2]); } byte[] outbyte=(byte[])outMessage.ToArray(Type.GetType("System.Byte")); return System.Text.Encoding.Default.GetString(outbyte); } } } |
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