1 #ifdef  __cplusplus 2 extern "C" { 3 #endif 4  5 char * base64_encode( const unsigned char * bindata, char * base64, int binlength ); 6 int base64_decode( const char * base64, unsigned char * bindata ); 7  8 #ifdef  __cplusplus 9 }10 #endif

 1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <string.h> 4 #include "base64.h" 5  6 #ifndef MAX_PATH 7 #define MAX_PATH 256 8 #endif 9 10 const char * base64char = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";11 12 char * base64_encode( const unsigned char * bindata, char * base64, int binlength )13 {14     int i, j;15     unsigned char current;16 17     for ( i = 0, j = 0 ; i < binlength ; i += 3 )18     {19         current = (bindata[i] >> 2) ;20         current &= (unsigned char)0x3F;21         base64[j++] = base64char[(int)current];22 23         current = ( (unsigned char)(bindata[i] << 4 ) ) & ( (unsigned char)0x30 ) ;24         if ( i + 1 >= binlength )25         {26             base64[j++] = base64char[(int)current];27             base64[j++] = ‘=‘;28             base64[j++] = ‘=‘;29             break;30         }31         current |= ( (unsigned char)(bindata[i+1] >> 4) ) & ( (unsigned char) 0x0F );32         base64[j++] = base64char[(int)current];33 34         current = ( (unsigned char)(bindata[i+1] << 2) ) & ( (unsigned char)0x3C ) ;35         if ( i + 2 >= binlength )36         {37             base64[j++] = base64char[(int)current];38             base64[j++] = ‘=‘;39             break;40         }41         current |= ( (unsigned char)(bindata[i+2] >> 6) ) & ( (unsigned char) 0x03 );42         base64[j++] = base64char[(int)current];43 44         current = ( (unsigned char)bindata[i+2] ) & ( (unsigned char)0x3F ) ;45         base64[j++] = base64char[(int)current];46     }47     base64[j] = ‘\0‘;48     return base64;49 }50 51 int base64_decode( const char * base64, unsigned char * bindata )52 {53     int i, j;54     unsigned char k;55     unsigned char temp[4];56     for ( i = 0, j = 0; base64[i] != ‘\0‘ ; i += 4 )57     {58         memset( temp, 0xFF, sizeof(temp) );59         for ( k = 0 ; k < 64 ; k ++ )60         {61             if ( base64char[k] == base64[i] )62                 temp[0]= k;63         }64         for ( k = 0 ; k < 64 ; k ++ )65         {66             if ( base64char[k] == base64[i+1] )67                 temp[1]= k;68         }69         for ( k = 0 ; k < 64 ; k ++ )70         {71             if ( base64char[k] == base64[i+2] )72                 temp[2]= k;73         }74         for ( k = 0 ; k < 64 ; k ++ )75         {76             if ( base64char[k] == base64[i+3] )77                 temp[3]= k;78         }79 80         bindata[j++] = ((unsigned char)(((unsigned char)(temp[0] << 2))&0xFC)) |81                 ((unsigned char)((unsigned char)(temp[1]>>4)&0x03));82         if ( base64[i+2] == ‘=‘ )83             break;84 85         bindata[j++] = ((unsigned char)(((unsigned char)(temp[1] << 4))&0xF0)) |86                 ((unsigned char)((unsigned char)(temp[2]>>2)&0x0F));87         if ( base64[i+3] == ‘=‘ )88             break;89 90         bindata[j++] = ((unsigned char)(((unsigned char)(temp[2] << 6))&0xF0)) |91                 ((unsigned char)(temp[3]&0x3F));92     }93     return j;94 }