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/**
* @file base64.cc
* @brief Implementation of base64 Utilities
* @author Andreas Aardal Hanssen
* @date 2002-2005
*/
#include "base64.h"
#include <iostream>
#include <string>
using std::string;
typedef unsigned char bbyte; // Byte type
#define TRUE 1
#define FALSE 0
#define LINELEN 72 // Encoded line length (max 76)
static bbyte dtable[256];
string Binc::base64encode(const string &s_in)
{
int i;
string result;
// Fill dtable with character encodings.
for (i = 0; i < 26; i++) {
dtable[i] = 'A' + i;
dtable[26 + i] = 'a' + i;
}
for (i = 0; i < 10; i++)
dtable[52 + i] = '0' + i;
dtable[62] = '+';
dtable[63] = '/';
string::const_iterator s_i = s_in.begin();
while (s_i != s_in.end()) {
bbyte igroup[3], ogroup[4];
int c, n;
igroup[0] = igroup[1] = igroup[2] = 0;
for (n = 0; n < 3 && s_i != s_in.end(); n++) {
c = *s_i++;
igroup[n] = static_cast<bbyte>(c);
}
if (n > 0) {
ogroup[0] = dtable[igroup[0] >> 2];
ogroup[1] = dtable[((igroup[0] & 3) << 4) | (igroup[1] >> 4)];
ogroup[2] = dtable[((igroup[1] & 0xF) << 2) | (igroup[2] >> 6)];
ogroup[3] = dtable[igroup[2] & 0x3F];
// Replace characters in output stream with "=" pad
// characters if fewer than three characters were
// read from the end of the input stream.
if (n < 3) {
ogroup[3] = '=';
if (n < 2) ogroup[2] = '=';
}
for (i = 0; i < 4; i++)
result += ogroup[i];
}
}
return result;
}
string Binc::base64decode(const string &s_in)
{
string result;
int i;
for (i = 0; i < 255; i++)
dtable[i] = 0x80;
for (i = 'A'; i <= 'Z'; i++)
dtable[i] = 0 + (i - 'A');
for (i = 'a'; i <= 'z'; i++)
dtable[i] = 26 + (i - 'a');
for (i = '0'; i <= '9'; i++)
dtable[i] = 52 + (i - '0');
dtable[(int)'+'] = 62;
dtable[(int)'/'] = 63;
dtable[(int)'='] = 0;
/*CONSTANTCONDITION*/
string::const_iterator s_i = s_in.begin();
while (s_i != s_in.end()) {
bbyte a[4], b[4], o[3];
for (i = 0; i < 4 && s_i != s_in.end(); i++) {
int c = *s_i++;
if (dtable[c] & 0x80) return result;
a[i] = (bbyte)c;
b[i] = (bbyte)dtable[c];
}
o[0] = (b[0] << 2) | (b[1] >> 4);
o[1] = (b[1] << 4) | (b[2] >> 2);
o[2] = (b[2] << 6) | b[3];
i = a[2] == '=' ? 1 : (a[3] == '=' ? 2 : 3);
for (int j = 0; j < i; ++j)
result += o[j];
if (i < 3) break;
}
return result;
}
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