133 lines
3.7 KiB
C++
133 lines
3.7 KiB
C++
#pragma once
|
|
#ifndef MESSMER_CPPUTILS_DATA_FIXEDSIZEDATA_H_
|
|
#define MESSMER_CPPUTILS_DATA_FIXEDSIZEDATA_H_
|
|
|
|
#include <cryptopp/hex.h>
|
|
#include <string>
|
|
#include <cstring>
|
|
#include "../assert/assert.h"
|
|
|
|
namespace cpputils {
|
|
|
|
template<size_t SIZE>
|
|
class FixedSizeData final {
|
|
public:
|
|
//Non-virtual destructor because we want objects to be small
|
|
~FixedSizeData() {}
|
|
|
|
static constexpr size_t BINARY_LENGTH = SIZE;
|
|
static constexpr size_t STRING_LENGTH = 2 * BINARY_LENGTH; // Hex encoding
|
|
|
|
//TODO Test Null()
|
|
static FixedSizeData<SIZE> Null();
|
|
|
|
static FixedSizeData<SIZE> FromString(const std::string &data);
|
|
std::string ToString() const;
|
|
|
|
static FixedSizeData<SIZE> FromBinary(const void *source);
|
|
void ToBinary(void *target) const;
|
|
|
|
const unsigned char *data() const;
|
|
unsigned char *data();
|
|
|
|
template<size_t size> FixedSizeData<size> take() const;
|
|
template<size_t size> FixedSizeData<SIZE-size> drop() const;
|
|
|
|
private:
|
|
FixedSizeData() {}
|
|
template<size_t _SIZE> friend class FixedSizeData;
|
|
|
|
unsigned char _data[BINARY_LENGTH];
|
|
};
|
|
|
|
template<size_t SIZE> bool operator==(const FixedSizeData<SIZE> &lhs, const FixedSizeData<SIZE> &rhs);
|
|
template<size_t SIZE> bool operator!=(const FixedSizeData<SIZE> &lhs, const FixedSizeData<SIZE> &rhs);
|
|
|
|
// ----- Implementation -----
|
|
|
|
template<size_t SIZE> constexpr size_t FixedSizeData<SIZE>::BINARY_LENGTH;
|
|
template<size_t SIZE> constexpr size_t FixedSizeData<SIZE>::STRING_LENGTH;
|
|
|
|
template<size_t SIZE>
|
|
FixedSizeData<SIZE> FixedSizeData<SIZE>::Null() {
|
|
FixedSizeData<SIZE> result;
|
|
std::memset(result._data, 0, BINARY_LENGTH);
|
|
return result;
|
|
}
|
|
|
|
template<size_t SIZE>
|
|
FixedSizeData<SIZE> FixedSizeData<SIZE>::FromString(const std::string &data) {
|
|
ASSERT(data.size() == STRING_LENGTH, "Wrong string size for parsing FixedSizeData");
|
|
FixedSizeData<SIZE> result;
|
|
CryptoPP::StringSource(data, true,
|
|
new CryptoPP::HexDecoder(
|
|
new CryptoPP::ArraySink(result._data, BINARY_LENGTH)
|
|
)
|
|
);
|
|
return result;
|
|
}
|
|
|
|
template<size_t SIZE>
|
|
std::string FixedSizeData<SIZE>::ToString() const {
|
|
std::string result;
|
|
CryptoPP::ArraySource(_data, BINARY_LENGTH, true,
|
|
new CryptoPP::HexEncoder(
|
|
new CryptoPP::StringSink(result)
|
|
)
|
|
);
|
|
ASSERT(result.size() == STRING_LENGTH, "Created wrongly sized string");
|
|
return result;
|
|
}
|
|
|
|
template<size_t SIZE>
|
|
const unsigned char *FixedSizeData<SIZE>::data() const {
|
|
return _data;
|
|
}
|
|
|
|
template<size_t SIZE>
|
|
unsigned char *FixedSizeData<SIZE>::data() {
|
|
return const_cast<unsigned char*>(const_cast<const FixedSizeData<SIZE>*>(this)->data());
|
|
}
|
|
|
|
template<size_t SIZE>
|
|
void FixedSizeData<SIZE>::ToBinary(void *target) const {
|
|
std::memcpy(target, _data, BINARY_LENGTH);
|
|
}
|
|
|
|
template<size_t SIZE>
|
|
FixedSizeData<SIZE> FixedSizeData<SIZE>::FromBinary(const void *source) {
|
|
FixedSizeData<SIZE> result;
|
|
std::memcpy(result._data, source, BINARY_LENGTH);
|
|
return result;
|
|
}
|
|
|
|
template<size_t SIZE> template<size_t size>
|
|
FixedSizeData<size> FixedSizeData<SIZE>::take() const {
|
|
static_assert(size <= SIZE, "Out of bounds");
|
|
FixedSizeData<size> result;
|
|
std::memcpy(result._data, _data, size);
|
|
return result;
|
|
}
|
|
|
|
template<size_t SIZE> template<size_t size>
|
|
FixedSizeData<SIZE-size> FixedSizeData<SIZE>::drop() const {
|
|
static_assert(size <= SIZE, "Out of bounds");
|
|
FixedSizeData<SIZE-size> result;
|
|
std::memcpy(result._data, _data+size, SIZE-size);
|
|
return result;
|
|
}
|
|
|
|
template<size_t SIZE>
|
|
bool operator==(const FixedSizeData<SIZE> &lhs, const FixedSizeData<SIZE> &rhs) {
|
|
return 0 == std::memcmp(lhs.data(), rhs.data(), FixedSizeData<SIZE>::BINARY_LENGTH);
|
|
}
|
|
|
|
template<size_t SIZE>
|
|
bool operator!=(const FixedSizeData<SIZE> &lhs, const FixedSizeData<SIZE> &rhs) {
|
|
return !operator==(lhs, rhs);
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|