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Added a simple Base64 class for encoding and decoding.

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Martín Lucas Golini
2014-07-31 02:56:27 -03:00
parent 7baf21e803
commit fd3a9f8797
4 changed files with 166 additions and 0 deletions
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120
src/eepp/system/base64.cpp Normal file
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#include <eepp/system/base64.hpp>
namespace EE { namespace System {
/* base64.c : base-64 / MIME encode/decode */
/* PUBLIC DOMAIN - Jon Mayo - November 13, 2003 */
/* $Id: base64.c 156 2007-07-12 23:29:10Z orange $ */
/* decode a base64 string in one shot */
int Base64::Decode(size_t in_len, const char *in, size_t out_len, unsigned char *out) {
static const Uint8 base64dec_tab[256] = {
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255, 62,255,255,255, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255, 0,255,255,
255, 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, 25,255,255,255,255,255,
255, 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, 51,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
};
unsigned ii, io;
Uint32 v;
unsigned rem;
for(io=0,ii=0,v=0,rem=0;ii<in_len;ii++) {
unsigned char ch;
if(isspace(in[ii])) continue;
if(in[ii]=='=') break; /* stop at = */
ch=base64dec_tab[(unsigned)in[ii]];
if(ch==255) break; /* stop at a parse error */
v=(v<<6)|ch;
rem+=6;
if(rem>=8) {
rem-=8;
if(io>=out_len) return -1; /* truncation is failure */
out[io++]=(v>>rem)&255;
}
}
if(rem>=8) {
rem-=8;
if(io>=out_len) return -1; /* truncation is failure */
out[io++]=(v>>rem)&255;
}
return io;
}
int Base64::Encode(size_t in_len, const unsigned char *in, size_t out_len, char *out) {
static const Uint8 base64enc_tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
unsigned ii, io;
Uint32 v;
unsigned rem;
for(io=0,ii=0,v=0,rem=0;ii<in_len;ii++) {
unsigned char ch;
ch=in[ii];
v=(v<<8)|ch;
rem+=8;
while(rem>=6) {
rem-=6;
if(io>=out_len) return -1; /* truncation is failure */
out[io++]=base64enc_tab[(v>>rem)&63];
}
}
if(rem) {
v<<=(6-rem);
if(io>=out_len) return -1; /* truncation is failure */
out[io++]=base64enc_tab[v&63];
}
while(io&3) {
if(io>=out_len) return -1; /* truncation is failure */
out[io++]='=';
}
if(io>=out_len) return -1; /* no room for null terminator */
out[io]=0;
return io;
}
bool Base64::Encode(const std::string & in, std::string & out) {
size_t b64len = EncodeSafeOutLen( in.size() );
if ( out.size() < b64len ) {
out.resize( b64len );
}
int len = Encode( in.size(), (const unsigned char*)in.c_str(), out.size(), (char*)&out[0] );
if ( -1 != len ) {
out.resize( len );
}
return -1 != len;
}
bool Base64::Decode(const std::string & in, std::string & out) {
size_t d64len = DecodeSafeOutLen( in.size() );
if ( out.size() < d64len ) {
out.resize( d64len );
}
int len = Decode( in.size(), in.c_str(), out.size(), (unsigned char*)&out[0] );
if ( -1 != len && (size_t)len != d64len ) {
out.resize( len );
}
return -1 != len;
}
}}