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////////////////////////////////////////////////////////////////////////
// Copyright (c) Nehmulos 2011-2014
// This file is part of N0 Strain Serialization Library.
//
// N0Strain-Serialization-Library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// N0Strain-Serialization-Library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with N0Strain-Serialization-Library. If not, see https://gnu.org/licenses/lgpl-3.0
////////////////////////////////////////////////////////////////////////
#include "N0SlibUtils.h"
#include <string.h>
/// Contains helpful functions to interact with the filesystem.
/// And converting binary data into human readable data.
namespace nw {
namespace utils {
/// Returns true if a file exists on the filesystem.
bool fileExists(const char *filename)
{
std::fstream file;
file.open(filename, std::ios::in);
if(file.is_open())
{
file.close();
return true;
}
return false;
}
bool touchFile(const char* filename)
{
FILE *file = fopen(filename, "a+");
if(file != NULL)
{
fclose(file);
return true;
}
return false;
}
bool createDirectory(const char* directory, unsigned int permissions)
{
//TODO parse permissions and map them to the system formats
#ifdef N0ware_System_Unix
permissions = ALLPERMS;
return mkdir(directory, permissions) == 0;
#elif defined N0ware_System_Windows
return CreateDirectory(directory, NULL);
#else
#warning "cannot create directories on this platform."
return false;
#endif
}
String getHomeDirectory()
{
#ifdef N0ware_System_Unix
struct passwd *pw = getpwuid(getuid());
return pw->pw_dir;
#elif defined N0ware_System_Windows
static const int bufferSize = 300;
char homeDir[bufferSize];
ExpandEnvironmentStrings("%userprofile%", homeDir, bufferSize);
return homeDir;
#endif
}
/// Converts a binary blob into a human readable hex String.
String toHex(const char* blob, unsigned int size)
{
//TODO add an encoding tag to blobs
const char* hexTable = "0123456789ABCDEF";
std::stringstream ss;
for (unsigned int i = 0; i < size; ++i) {
char hex1, hex2;
char c = *(blob + i);
hex1 = hexTable[(c & 0x0F)];
hex2 = hexTable[(c & 0xF0) >> 4];
ss << hex1;
ss << hex2;
}
return ss.str();
}
String toHex(String value)
{
return toHex(value.data(), value.size());
}
String fromHex(String hexString)
{
static const char w = -1;
static const int hexToValueTable[] = {
w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w,
w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w,
w, w, w, w, w, w, w, w, w, w, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, w, w,
w, w, w, w, w, 10, 11, 12, 13, 14, 15, w, w, w, w, w, w, w, w,
w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w,
w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w,
w, w, w, w, w, w, w, w, w, w, w
};
std::stringstream ss;
// Two HEX chars make 1 binary byte
for (int i = 0; i < hexString.size(); ++i)
{
char binC = 0;
char hex;
// HEXchar 1
if(hexString.at(i) > 0)
{
hex = hexToValueTable[hexString.at(i)];
if(hex != w)
binC += hex;
else
std::cout << "Invalid hex char" << std::endl;
}
++i;
// HEXchar 2
if(i > w)
{
if(hexString.at(i) > 0)
{
hex = hexToValueTable[hexString.at(i)] << 4;
if(hex != w)
binC += hex;
else
std::cout << "Invalid hex char" << std::endl;
}
}
ss << binC;
}
return ss.str();
}
// https://stackoverflow.com/a/19968992
// I already wrote an utf8 to unicode converter a few years ago,
// and I wasn't too excited to do it again the other way around.
String utf8FromIntCode(unsigned int code)
{
std::string out;
if (code <= 0x7f)
{
out.append(1, static_cast<char>(code));
}
else if (code <= 0x7ff)
{
out.append(1, static_cast<char>(0xc0 | ((code >> 6) & 0x1f)));
out.append(1, static_cast<char>(0x80 | (code & 0x3f)));
}
else if (code <= 0xffff)
{
out.append(1, static_cast<char>(0xe0 | ((code >> 12) & 0x0f)));
out.append(1, static_cast<char>(0x80 | ((code >> 6) & 0x3f)));
out.append(1, static_cast<char>(0x80 | (code & 0x3f)));
}
else
{
out.append(1, static_cast<char>(0xf0 | ((code >> 18) & 0x07)));
out.append(1, static_cast<char>(0x80 | ((code >> 12) & 0x3f)));
out.append(1, static_cast<char>(0x80 | ((code >> 6) & 0x3f)));
out.append(1, static_cast<char>(0x80 | (code & 0x3f)));
}
return out;
}
String toBase64(const char* blob, unsigned int size)
{
static const char* base64Table = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
std::stringstream ss;
char block[3];
for(unsigned int i=0; i < size; )
{
char nulled = 0;
//Get 24bit block from string
for(unsigned int j=0; j < 3; ++j)
{
if(i < size)
{
block[j] = blob[i];
}
else
{
block[j] = 0;
nulled++;
}
i++;
}
// Example: encoding FF FF FF to base64
// convert 3 bytes to 4 6bit values
//1111 11 11 1111 1111 11 11 1111 //bin
//\-----/ \------/ \------/ \-----/ //6bit blocks
// | \ \ \ //connection
// | \ ''\ '''''\ //
//0011 1111 0011 1111 0011 1111 0011 1111 //base64 in 8bit
// Result: 3F 3F 3F 3F
// 0xFC == 1111 1100
// 0x03 == 0000 0011
// 0xF0 == 1111 0000
// 0x0F == 0000 1111
// 0xC0 == 1100 0000
// 0x3F == 0011 1111
char base64Result[4]; //Contains the ids for the base64Table
base64Result[0] = (block[0] & 0xFC) >> 2;
base64Result[1] = ((block[0] & 0x03) << 4) + ((block[1] & 0xF0) >> 4);
base64Result[2] = ((block[1] & 0x0F) << 2) + ((block[2] & 0xC0) >> 6);
base64Result[3] = block[2] & 0x3F;
for (int j = 0; j < 4; ++j)
{
if(j < 4 - nulled)
ss << base64Table[base64Result[j]];
else
ss << '=';
}
}
return ss.str();
}
String toBase64(String value)
{
return toBase64(value.data(), value.size());
}
String fromBase64(String encodedString)
{
//Maps the chars to their corresponding base64 values between 0 and 63
//Other ascii characters are mapped to -1
static const char w = -1;
static const char base64ToBinaryTable[128] = {
w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w,
w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w, w,
w, w, w, w, w, 62, w, w, w, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60,
61, w, w, w, w, w, w, w, 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, w, w, w, w,
w, w, 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, w, w, w, w, w
};
std::stringstream ss;
for (unsigned int i = 0; i < encodedString.size(); )
{
char binaryTranslation[4]; // a Base64 block that represents 3 bytes
char nulled = 0;
unsigned int sizeOfEncodedString = encodedString.size();
//Read 4 characters from the base64 String
for (int j = 0; j < 4; ++j)
{
if(i < sizeOfEncodedString)
{
char c = encodedString.at(i);
if(c != '=')
{
//read the next char if the current is markup or invalid
if(c == '\n')
{
--j;
}
else
{
// check for buffer overflow
if(c >= 0)
{
//translate the b64 char to a binary value
binaryTranslation[j] = base64ToBinaryTable[c];
}
else
{
binaryTranslation[j] = w;
}
// check for invalid character
if(binaryTranslation[j] == w)
{
--j;
std::cout << "Warning: " << c << '('<< (int)c << ')' << " is not a valid Base64 Character" << std::endl;
}
}
}
else
{
binaryTranslation[j] = 0;
nulled++;
}
i++;
}
}
char block[3];
// Example: encoding 3F 3F 3F 3F to binary
// convert 3 bytes to 4 6bit values
//
//0011 1111 0011 1111 0011 1111 0011 1111 //base64 in 8bit
// \-----/ \/ \--/ \---/\/ \-----/ //8bit blocks
// \ / \ / \ / //connection
// |''''''' |'''''' ''''''| //
//1111 1111 1111 1111 1111 1111 //bin
//
//p == skip, r == read
//the first 2 bits of 3F don't have to be choped before addition, as they are already 0
//2p 6r 2p 2r || 4r 2p 4r || 2r 2p 6r
block[0] = ((binaryTranslation[0] & 0x3F) << 2) + ((binaryTranslation[1] & 0x30) >> 4);
block[1] = ((binaryTranslation[1] & 0x0F) << 4) + ((binaryTranslation[2] & 0x3C) >> 2);
block[2] = ((binaryTranslation[2] & 0x03) << 6) + ((binaryTranslation[3] & 0x3F));
for (int j = 0; j < 3 - nulled; ++j)
ss << block[j];
}
return ss.str();
}
int lengthOfCharOrString(const char* str) {
return strlen(str);
}
int lengthOfCharOrString(const char) {
return sizeof(char);
}
int lengthOfCharOrString(const String& str) {
return str.length();
}
} // namespace utils
} // namespace nw