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Uc2ToUtf8.cpp
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Uc2ToUtf8.cpp
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#include "common.h"
#include <stdexcept>
#include <iostream>
int Uc2ToUtf8(
const U_NIC* uc2arrray,
size_t uc2len,
U_TF8* utfdest,
size_t utfspace) {
try {
if (uc2arrray == nullptr || utfdest == nullptr)
throw std::runtime_error("Check your file source!");
}
catch (std::runtime_error& e) {
std::cout << e.what() << std::endl;
abort();
}
const U_NIC* uc2pos = uc2arrray;
const U_NIC* uc2end = uc2arrray + uc2len;
U_TF8* utf8pos = utfdest;
U_TF8* utf8end = utfdest + utfspace;
while (uc2pos < uc2end && utf8pos < utf8end)
{
if (*uc2pos < 0x80)
{
*utf8pos++ = *uc2pos++;
}
else if (*uc2pos < 0x800)
{
if (utfspace < 2)
break;
*utf8pos++ = ((*uc2pos & 0x07C0) >> 6) | 0xc0;
*utf8pos++ = (*uc2pos++ & 0x003F) | 0x80;
}
else
{
if (utfspace < 3)
break;
*utf8pos++ = ((*uc2pos & 0xF000) >> 12) | 0xE0;
*utf8pos++ = ((*uc2pos & 0x0FC0) >> 6) | 0x80;
*utf8pos++ = (*uc2pos++ & 0x003F) | 0x80;
}
}
return (utf8pos - utfdest);
}