46 lignes
1.3 KiB
C
46 lignes
1.3 KiB
C
|
#pragma once
|
||
|
|
|
||
|
|
#include <locale>
|
||
|
|
#include <string>
|
||
|
|
#include <algorithm>
|
||
|
|
|
||
|
|
#include "../errors.h"
|
||
|
|
|
||
|
|
namespace sqlite
|
||
|
|
{
|
||
|
|
namespace utility
|
||
|
|
{
|
||
|
|
inline std::string utf16_to_utf8(const std::u16string &input)
|
||
|
|
{
|
||
|
|
struct : std::codecvt<char16_t, char, std::mbstate_t>
|
||
|
|
{
|
||
|
|
} codecvt;
|
||
|
|
std::mbstate_t state{};
|
||
|
|
std::string result((std::max)(input.size() * 3 / 2, std::size_t(4)), '\0');
|
||
|
|
const char16_t *remaining_input = input.data();
|
||
|
|
std::size_t produced_output = 0;
|
||
|
|
while(true)
|
||
|
|
{
|
||
|
|
char *used_output;
|
||
|
|
switch(codecvt.out(state, remaining_input, &input[input.size()], remaining_input, &result[produced_output],
|
||
|
|
&result[result.size() - 1] + 1, used_output))
|
||
|
|
{
|
||
|
|
case std::codecvt_base::ok:
|
||
|
|
result.resize(used_output - result.data());
|
||
|
|
return result;
|
||
|
|
case std::codecvt_base::noconv:
|
||
|
|
// This should be unreachable
|
||
|
|
case std::codecvt_base::error:
|
||
|
|
throw errors::invalid_utf16("Invalid UTF-16 input", "");
|
||
|
|
case std::codecvt_base::partial:
|
||
|
|
if(used_output == result.data() + produced_output)
|
||
|
|
throw errors::invalid_utf16("Unexpected end of input", "");
|
||
|
|
produced_output = used_output - result.data();
|
||
|
|
result.resize(result.size() +
|
||
|
|
(std::max)((&input[input.size()] - remaining_input) * 3 / 2, std::ptrdiff_t(4)));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} // namespace utility
|
||
|
|
} // namespace sqlite
|