//+------------------------------------------------------------------+
//| Base64.mq4 |
//| Copyright © 2006, MetaQuotes Software Corp. |
//| http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2006, MetaQuotes Software Corp."
#property link "http://www.metaquotes.net"
static int ExtBase64Encode[64]={ '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','+','/' };
static int ExtBase64Decode[256]={
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -2, -1, -1,
-1, 0, 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, -1, -1, -1, -1, -1,
-1, 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, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 };
//+------------------------------------------------------------------+
//| Êîäèðîâàíèå äàííûõ â base64 |
//+------------------------------------------------------------------+
void Base64Encode(string in,string &out)
{
int i=0,pad=0,len=StringLen(in);
//---- ïðîéäåìñÿ è çàêîäèðóåì
while(i<len)
{
//---- èçâëåêàåì áàéòû
int b3,b2,b1=StringGetChar(in,i);
i++;
if(i>=len) { b2=0; b3=0; pad=2; }
else
{
b2=StringGetChar(in,i);
i++;
if(i>=len) { b3=0; pad=1; }
else { b3=StringGetChar(in,i); i++; }
}
//----
int c1=(b1 >> 2);
int c2=(((b1 & 0x3) << 4) | (b2 >> 4));
int c3=(((b2 & 0xf) << 2) | (b3 >> 6));
int c4=(b3 & 0x3f);
out=out+CharToStr(ExtBase64Encode[c1]);
out=out+CharToStr(ExtBase64Encode[c2]);
switch(pad)
{
case 0:
out=out+CharToStr(ExtBase64Encode[c3]);
out=out+CharToStr(ExtBase64Encode[c4]);
break;
case 1:
out=out+CharToStr(ExtBase64Encode[c3]);
out=out+"=";
break;
case 2:
out=out+"==";
break;
}
}
//----
}
//+------------------------------------------------------------------+
//| Äåêîäèðîâàíèå äàííûõ èç Base64 |
//+------------------------------------------------------------------+
void Base64Decode(string in,string &out)
{
int i=0,len=StringLen(in);
int shift=0,accum=0;
//---- èäåì äî êîíöà
while(i<len)
{
//---- èçâëå÷åì êîä
int value=ExtBase64Decode[StringGetChar(in,i)];
if(value<0 || value>63) break; // êîíåö èëè íåâåðíàÿ êîäèðîâêà
//---- ðàçâåðíåì êîä
accum<<=6;
shift+=6;
accum|=value;
if(shift>=8)
{
shift-=8;
value=accum >> shift;
out=out+CharToStr(value & 0xFF);
}
i++;
}
//----
}
//+------------------------------------------------------------------+
Sample
Analysis
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