Created
January 25, 2012 13:32
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reading integer from network stream
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all: StreamReader.hpp test.cpp | |
g++ -o test test.cpp |
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#include <endian.h> | |
#include <string.h> | |
#include <iostream> | |
namespace { | |
template <typename T> | |
union TypeCaster | |
{ | |
T data; | |
char bytes[sizeof(T)]; | |
}; | |
template <typename T, int> | |
struct ByteOrder_ { | |
static inline T convert(T val); | |
}; | |
template<typename T> | |
struct ByteOrder_<T, 2> { | |
static inline T convert(T val) { | |
return htobe16(val); | |
} | |
}; | |
template<typename T> | |
struct ByteOrder_<T, 4> { | |
static inline T convert(T val) { | |
return htobe32(val); | |
} | |
}; | |
template<typename T> | |
struct ByteOrder_<T, 8> { | |
static inline T convert(T val) { | |
return htobe64(val); | |
} | |
}; | |
template<typename T> | |
struct ByteOrder { | |
static inline T convert(T val) { | |
return ByteOrder_<T, sizeof(T)>::convert(val); | |
} | |
}; | |
} // namespace | |
template<typename T> | |
struct StreamReader | |
{ | |
inline static T read(std::istream &in) { | |
int size = sizeof(T); | |
TypeCaster<T> caster; | |
in.read(caster.bytes, size); | |
return ByteOrder<T>::convert(caster.data); | |
} | |
}; |
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#include <assert.h> | |
#include <stdint.h> | |
#include <iostream> | |
#include <sstream> | |
#include <string> | |
#include "StreamReader.hpp" | |
int main(void) { | |
std::istringstream is("12345678"); | |
assert (StreamReader<int32_t>::read(is) == 0x31323334); | |
assert (StreamReader<int32_t>::read(is) == 0x35363738); | |
is.seekg(0, std::ios::beg); | |
assert (StreamReader<int64_t>::read(is) == 0x3132333435363738); | |
is.seekg(3, std::ios::beg); | |
assert (StreamReader<int16_t>::read(is) == 0x3435); | |
return 0; | |
} |
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