base64 added

base64.cpp

@@ -0,0 +1,231 @@
+#include <stdlib.h>
+#include "base64.h"
+
+namespace i2p
+{
+namespace data
+{
+
+	static void iT64Build(void);
+
+	/*
+	*
+	* BASE64 Substitution Table
+	* -------------------------
+	*
+	* Direct Substitution Table
+	*/
+
+	static char T64[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', '-', '~'
+	};
+
+	/*
+	* Reverse Substitution Table (built in run time)
+	*/
+
+	static char iT64[256];
+	static int isFirstTime = 1;
+
+	/*
+	* Padding 
+	*/
+
+	static char P64 = '='; 
+
+	/*
+	*
+	* ByteStreamToBase64
+	* ------------------
+	*
+	* Converts binary encoded data to BASE64 format.
+	*
+	*/
+
+	size_t                                /* Number of bytes in the encoded buffer */
+	ByteStreamToBase64 ( 
+		    const uint8_t * InBuffer,           /* Input buffer, binary data */
+		    size_t    InCount,              /* Number of bytes in the input buffer */ 
+		    char  * OutBuffer,          /* output buffer */
+		size_t len			   /* length of output buffer */	             
+	)
+
+	{
+		unsigned char * ps;
+		unsigned char * pd;
+		unsigned char   acc_1;
+		unsigned char   acc_2;
+		int             i; 
+		int             n; 
+		int             m; 
+		size_t outCount;
+
+		ps = (unsigned char *)InBuffer;
+		n = InCount/3;
+		m = InCount%3;
+		if (!m)
+		     outCount = 4*n;
+		else
+		     outCount = 4*(n+1);
+		if (outCount > len) return -1;
+		pd = (unsigned char *)OutBuffer;
+		for ( i = 0; i<n; i++ ){
+		     acc_1 = *ps++;
+		     acc_2 = (acc_1<<4)&0x30; 
+		     acc_1 >>= 2;              /* base64 digit #1 */
+		     *pd++ = T64[acc_1];
+		     acc_1 = *ps++;
+		     acc_2 |= acc_1 >> 4;      /* base64 digit #2 */
+		     *pd++ = T64[acc_2];
+		     acc_1 &= 0x0f;
+		     acc_1 <<=2;
+		     acc_2 = *ps++;
+		     acc_1 |= acc_2>>6;        /* base64 digit #3 */
+		     *pd++ = T64[acc_1];
+		     acc_2 &= 0x3f;            /* base64 digit #4 */
+		     *pd++ = T64[acc_2];
+		} 
+		if ( m == 1 ){
+		     acc_1 = *ps++;
+		     acc_2 = (acc_1<<4)&0x3f;  /* base64 digit #2 */
+		     acc_1 >>= 2;              /* base64 digit #1 */
+		     *pd++ = T64[acc_1];
+		     *pd++ = T64[acc_2];
+		     *pd++ = P64;
+		     *pd++ = P64;
+
+		}
+		else if ( m == 2 ){
+		     acc_1 = *ps++;
+		     acc_2 = (acc_1<<4)&0x3f; 
+		     acc_1 >>= 2;              /* base64 digit #1 */
+		     *pd++ = T64[acc_1];
+		     acc_1 = *ps++;
+		     acc_2 |= acc_1 >> 4;      /* base64 digit #2 */
+		     *pd++ = T64[acc_2];
+		     acc_1 &= 0x0f;
+		     acc_1 <<=2;               /* base64 digit #3 */
+		     *pd++ = T64[acc_1];
+		     *pd++ = P64;
+		}
+		
+		return outCount;
+	}
+
+	/*
+	*
+	* Base64ToByteStream
+	* ------------------
+	*
+	* Converts BASE64 encoded data to binary format. If input buffer is
+	* not properly padded, buffer of negative length is returned
+	*
+	*/
+
+	size_t                              /* Number of output bytes */
+	Base64ToByteStream ( 
+		      const char * InBuffer,           /* BASE64 encoded buffer */
+		      size_t    InCount,          /* Number of input bytes */
+		      uint8_t  * OutBuffer,	/* output buffer length */ 	
+		  size_t len         	/* length of output buffer */
+	)
+	{
+		unsigned char * ps;
+		unsigned char * pd;
+		unsigned char   acc_1;
+		unsigned char   acc_2;
+		int             i; 
+		int             n; 
+		int             m; 
+		size_t outCount;
+
+		if (isFirstTime) iT64Build();
+		n = InCount/4;
+		m = InCount%4;
+		if (!m) 
+		     outCount = 3*n;
+		else {
+		     outCount = 0;
+		     return -1;
+		}
+		
+		ps = (unsigned char *)(InBuffer + InCount - 1);
+		while ( *ps-- == P64 ) outCount--;
+		ps = (unsigned char *)InBuffer;
+		
+		if (outCount > len) return -1;
+		pd = (unsigned char *)OutBuffer;
+		for ( i = 0; i < n; i++ ){
+		     acc_1 = iT64[*ps++];
+		     acc_2 = iT64[*ps++];
+		     acc_1 <<= 2;
+		     acc_1 |= acc_2>>4;
+		     *pd++  = acc_1;
+
+		     acc_2 <<= 4;
+		     acc_1 = iT64[*ps++];
+		     acc_2 |= acc_1 >> 2;
+		     *pd++ = acc_2;
+
+		     acc_2 = iT64[*ps++];
+		     acc_2 |= acc_1 << 6;
+		     *pd++ = acc_2;
+		}
+
+		return outCount;
+	}
+
+	/*
+	*
+	* iT64
+	* ----
+	* Reverse table builder. P64 character is replaced with 0
+	*
+	*
+	*/
+
+	static void iT64Build()
+	{
+		int  i;
+		isFirstTime = 0;
+		for ( i=0; i<256; i++ ) iT64[i] = -1;
+		for ( i=0; i<64; i++ ) iT64[(int)T64[i]] = i;
+		iT64[(int)P64] = 0;
+	}
+
+	size_t Base32ToByteStream (const char * inBuf, size_t len, uint8_t * outBuf, size_t outLen) 
+	{
+		int tmp = 0, bits = 0;
+		size_t ret = 0;
+		for (size_t i = 0; i < len; i++)
+		{
+			char ch = inBuf[i];	
+			if (ch >= '2' && ch <= '7') // digit
+				ch = (ch - '2') + 26; // 26 means a-z
+			else if (ch >= 'a' && ch <= 'z')
+				ch = ch - 'a'; // a = 0
+			else
+				return 0; // unexpected character
+			
+			tmp |= ch;
+			bits += 5;
+			if (bits >= 8)
+			{
+				if (ret >= outLen) return ret;
+				outBuf[ret] = tmp >> (bits - 8);
+				bits -= 8;
+				ret++;
+			}
+			tmp <<= 5;
+		}
+		return ret;
+	}
+}
+}

base64.h

@@ -0,0 +1,21 @@
+#ifndef BASE64_H
+#define BASE64_H
+
+#include <inttypes.h>
+#include <string.h>
+
+namespace i2p
+{
+namespace data
+{
+
+	size_t ByteStreamToBase64 (const uint8_t * InBuffer, size_t InCount, char * OutBuffer, size_t len);
+	size_t Base64ToByteStream (const char * InBuffer, size_t InCount, uint8_t * OutBuffer, size_t len );
+
+	size_t Base32ToByteStream (const char * inBuf, size_t len, uint8_t * outBuf, size_t outLen);
+
+}
+}
+
+#endif
+