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/*
base64.cpp and base64.h
Copyright (C) 2004-2008 René Nyffenegger
This source code is provided 'as-is', without any express or implied
warranty. In no event will the author be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this source code must not be misrepresented; you must not
claim that you wrote the original source code. If you use this source code
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original source code.
3. This notice may not be removed or altered from any source distribution.
René Nyffenegger rene.nyffenegger@adp-gmbh.ch
*/
#ifndef rn_base64_h
#define rn_base64_h
#include <cstring>
#include <string>
#ifdef WIN32
#define strdup _strdup
#endif
static const std::string base64_chars =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
static inline bool is_base64(unsigned char c)
{
return (isalnum(c) || (c == '+') || (c == '/'));
}
static inline std::string base64_encode_aux(const char* str, size_t in_len)
{
std::string ret = "";
int i = 0;
int j = 0;
unsigned char char_array_3[3];
unsigned char char_array_4[4];
// printf("base64_encode len = %d\n", in_len);
while (in_len--) {
char_array_3[i++] = *(str++);
if (i == 3) {
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (i = 0; (i < 4); i++) {
ret += base64_chars[char_array_4[i]];
}
i = 0;
}
}
if (i) {
for (j = i; j < 3; j++) {
char_array_3[j] = '\0';
}
char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
char_array_4[3] = char_array_3[2] & 0x3f;
for (j = 0; (j < i + 1); j++) {
ret += base64_chars[char_array_4[j]];
}
while ((i++ < 3)) {
ret += '=';
}
}
return ret;
}
static inline std::string base64_decode_aux(const char* str, size_t in_len)
{
int i = 0;
int j = 0;
int in_ = 0;
unsigned char char_array_4[4], char_array_3[3];
std::string ret = "";
while (in_len-- && (str[in_] != '=') && is_base64(str[in_])) {
char_array_4[i++] = str[in_];
in_++;
if (i == 4) {
for (i = 0; i < 4; i++) {
char_array_4[i] = (unsigned char)base64_chars.find(char_array_4[i]);
}
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (i = 0; (i < 3); i++) {
ret += char_array_3[i];
}
i = 0;
}
}
if (i) {
for (j = i; j < 4; j++) {
char_array_4[j] = 0;
}
for (j = 0; j < 4; j++) {
char_array_4[j] = (unsigned char)base64_chars.find(char_array_4[j]);
}
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (j = 0; (j < i - 1); j++) {
ret += char_array_3[j];
}
}
return ret;
}
static inline char* base64_encode(const char* str, unsigned int len)
{
return strdup(base64_encode_aux(str, len).c_str());
}
static inline char* base64_decode(const char* str, unsigned int len)
{
return strdup(base64_decode_aux(str, len).c_str());
}
static inline std::string base64_encode(std::string const& str)
{
return base64_encode_aux(str.c_str(), str.size());
}
static inline std::string base64_decode(std::string const& str)
{
return base64_decode_aux(str.c_str(), str.size());
}
#endif
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