mirror of
https://github.com/minetest/minetest.git
synced 2024-11-16 04:33:45 +01:00
132 lines
3.6 KiB
C++
132 lines
3.6 KiB
C++
/*
|
|
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
|
|
|
|
*/
|
|
|
|
#include "base64.h"
|
|
#include <iostream>
|
|
|
|
static const std::string base64_chars =
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
|
"abcdefghijklmnopqrstuvwxyz"
|
|
"0123456789+/";
|
|
|
|
|
|
static inline bool is_base64(unsigned char c) {
|
|
return (isalnum(c) || (c == '+') || (c == '/'));
|
|
}
|
|
|
|
bool base64_is_valid(std::string const& s)
|
|
{
|
|
for(size_t i=0; i<s.size(); i++)
|
|
if(!is_base64(s[i])) return false;
|
|
return true;
|
|
}
|
|
|
|
std::string base64_encode(unsigned char const* bytes_to_encode, unsigned int in_len) {
|
|
std::string ret;
|
|
int i = 0;
|
|
int j = 0;
|
|
unsigned char char_array_3[3];
|
|
unsigned char char_array_4[4];
|
|
|
|
while (in_len--) {
|
|
char_array_3[i++] = *(bytes_to_encode++);
|
|
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]];
|
|
|
|
// Don't pad it with =
|
|
/*while((i++ < 3))
|
|
ret += '=';*/
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
std::string base64_decode(std::string const& encoded_string) {
|
|
int in_len = encoded_string.size();
|
|
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-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
|
|
char_array_4[i++] = encoded_string[in_]; in_++;
|
|
if (i ==4) {
|
|
for (i = 0; i <4; i++)
|
|
char_array_4[i] = 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] = 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;
|
|
}
|