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/**
* @file
* @author 2012-2013 Stefan Radomski (stefan.radomski@cs.tu-darmstadt.de)
* @copyright Simplified BSD
*
* @cond
* This program is free software: you can redistribute it and/or modify
* it under the terms of the FreeBSD license as published by the FreeBSD
* project.
*
* This program 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.
*
* You should have received a copy of the FreeBSD license along with this
* program. If not, see <http://www.opensource.org/licenses/bsd-license>.
* @endcond
*/
#ifndef CONVENIENCE_H_LU7GZ6CB
#define CONVENIENCE_H_LU7GZ6CB
#include "uscxml/Common.h"
#include <inttypes.h>
#include <stdlib.h>
#include <boost/detail/endian.hpp>
#include <boost/lexical_cast.hpp>
namespace uscxml {
inline bool isnan(double x);
// see http://stackoverflow.com/questions/228005/alternative-to-itoa-for-converting-integer-to-string-c
template <typename T> std::string toStr(T tmp) {
std::ostringstream out;
out.precision(std::numeric_limits<double>::digits10 + 1);
out << tmp;
return out.str();
}
template <typename T> T strTo(std::string tmp) {
T output;
std::istringstream in(tmp);
in >> output;
return output;
}
class USCXML_API NumAttr {
public:
NumAttr(const std::string& str) {
size_t valueStart = str.find_first_of("0123456789.");
if (valueStart != std::string::npos) {
size_t valueEnd = str.find_last_of("0123456789.");
if (valueEnd != std::string::npos) {
value = str.substr(valueStart, (valueEnd - valueStart) + 1);
size_t unitStart = str.find_first_not_of(" \t", valueEnd + 1);
if (unitStart != std::string::npos) {
size_t unitEnd = str.find_last_of(" \t");
if (unitEnd != std::string::npos && unitEnd > unitStart) {
unit = str.substr(unitStart, unitEnd - unitStart);
} else {
unit = str.substr(unitStart, str.length() - unitStart);
}
}
}
}
}
std::string value;
std::string unit;
};
bool isNumeric(const char* pszInput, int nNumberBase);
bool isInteger( const char* pszInput, int nNumberBase);
bool iequals(const std::string& a, const std::string& b);
bool equals(const std::string& a, const std::string& b);
bool stringIsTrue(const std::string& value);
bool envVarIsTrue(const char* name);
bool envVarIEquals(const char* name, const char* value);
std::string escape(const std::string& a);
std::string unescape(const std::string& a);
// see http://www.cplusplus.com/forum/general/27544/
// Little-endian operating systems:
//---------------------------------
// Linux on x86, x64, Alpha and Itanium
// Mac OS on x86, x64
// Solaris on x86, x64, PowerPC
// Tru64 on Alpha
// Windows on x86, x64 and Itanium
// Big-endian operating systems:
//------------------------------
// AIX on POWER
// AmigaOS on PowerPC and 680x0
// HP-UX on Itanium and PA-RISC
// Linux on MIPS, SPARC, PA-RISC, POWER, PowerPC, and 680x0
// Mac OS on PowerPC and 680x0
// Solaris on SPARC
/**
Detect endianness, see http://stackoverflow.com/questions/809902/64-bit-ntohl-in-c
union {
unsigned long long ull;
char c[8];
} x;
x.ull = 0x0123456789abcdef; // may need special suffix for ULL.
*/
enum endianness {
little_endian,
big_endian,
network_endian = big_endian,
#if defined(BOOST_LITTLE_ENDIAN)
host_endian = little_endian
#elif defined(BOOST_BIG_ENDIAN)
host_endian = big_endian
#else
#error "unable to determine system endianness"
#endif
};
namespace detail {
template<typename T, size_t sz>
struct swap_bytes {
inline T operator()(T val) {
throw std::out_of_range("data size");
}
};
template<typename T>
struct swap_bytes<T, 1> {
inline T operator()(T val) {
return val;
}
};
template<typename T>
struct swap_bytes<T, 2> { // for 16 bit
inline T operator()(T val) {
return ((((val) >> 8) & 0xff) | (((val) & 0xff) << 8));
}
};
template<typename T>
struct swap_bytes<T, 4> { // for 32 bit
inline T operator()(T val) {
#if defined(_USE_BUILTIN_BSWAPS) && defined(__GNUC__) && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4)
return __builtin_bswap32(val);
#else
return ((((val) & 0xff000000) >> 24) |
(((val) & 0x00ff0000) >> 8) |
(((val) & 0x0000ff00) << 8) |
(((val) & 0x000000ff) << 24));
#endif
}
};
template<>
struct swap_bytes<float, 4> {
inline float operator()(float val) {
uint32_t mem = swap_bytes<uint32_t, sizeof(uint32_t)>()(*(uint32_t*)&val);
return *(float*)&mem;
}
};
template<typename T>
struct swap_bytes<T, 8> { // for 64 bit
inline T operator()(T val) {
#if defined(_USE_BUILTIN_BSWAPS) && defined(__GNUC__) && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4)
return __builtin_bswap64(val);
#else
return ((((val) & 0xff00000000000000ull) >> 56) |
(((val) & 0x00ff000000000000ull) >> 40) |
(((val) & 0x0000ff0000000000ull) >> 24) |
(((val) & 0x000000ff00000000ull) >> 8 ) |
(((val) & 0x00000000ff000000ull) << 8 ) |
(((val) & 0x0000000000ff0000ull) << 24) |
(((val) & 0x000000000000ff00ull) << 40) |
(((val) & 0x00000000000000ffull) << 56));
#endif
}
};
template<>
struct swap_bytes<double, 8> {
inline double operator()(double val) {
uint64_t mem = swap_bytes<uint64_t, sizeof(uint64_t)>()(*(uint64_t*)&val);
return *(double*)&mem;
}
};
template<endianness from, endianness to, class T>
struct do_byte_swap {
inline T operator()(T value) {
return swap_bytes<T, sizeof(T)>()(value);
}
};
// specialisations when attempting to swap to the same endianess
template<class T> struct do_byte_swap<little_endian, little_endian, T> {
inline T operator()(T value) {
return value;
}
};
template<class T> struct do_byte_swap<big_endian, big_endian, T> {
inline T operator()(T value) {
return value;
}
};
} // namespace detail
template<endianness from, endianness to, class T>
inline T byte_swap(T value) {
// ensure the data is only 1, 2, 4 or 8 bytes
BOOST_STATIC_ASSERT(sizeof(T) == 1 || sizeof(T) == 2 || sizeof(T) == 4 || sizeof(T) == 8);
// ensure we're only swapping arithmetic types
BOOST_STATIC_ASSERT(boost::is_arithmetic<T>::value);
return detail::do_byte_swap<from, to, T>()(value);
}
}
#endif /* end of include guard: CONVENIENCE_H_LU7GZ6CB */
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