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test_utf32to8.cpp
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test_utf32to8.cpp
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#include <string>
#include <vector>
#include <iostream>
using namespace std;
int main(int argc, _TCHAR* argv[])
{
vector<int> u32 = { 1055, 1088, 1080, 1074, 1077, 1090, 44, 32, 1084, 1080, 1088, 33 };
string s = "";
for (auto i = 0; i < u32.size(); i++) {
int v = u32[i];
cout << v << " " << endl;
if (v <= 0x7f) {
s += (char)(v & 0x7f);
}
else if (v <= 0x7ff) {
int a = 0x80 + (v & 0x3f);
int b = 0xc0 + ((v & 0x7c0) >> 6);
s += (char)b;
s += (char)a;
}
else if (v <= 0xffff) {
int a = 0x80 + (v & 0x3f);
int b = 0x80 + ((v & 0x0fc0) >> 6);
int c = 0xe0 + ((v & 0xf000) >> 12);
s += (char)c;
s += (char)b;
s += (char)a;
}
else if (v <= 0x1fffff) {
int a = 0x80 + (v & 0x3f);
int b = 0x80 + ((v & 0x0fc0) >> 6);
int c = 0x80 + ((v & 0x3f000) >> 12);
int d = 0xf0 + ((v & 0x1c0000) >> 18);
s += (char)d;
s += (char)c;
s += (char)b;
s += (char)a;
}
else if (v <= 0x03ffffff) {
int a = 0x80 + (v & 0x3f);
int b = 0x80 + ((v & 0x0fc0) >> 6);
int c = 0x80 + ((v & 0x3f000) >> 12);
int d = 0x80 + ((v & 0xfc0000) >> 18);
int e = 0xf8 + (v >> 24);
s += (char)e;
s += (char)d;
s += (char)c;
s += (char)b;
s += (char)a;
}
else {
int a = 0x80 + (v & 0x3f);
int b = 0x80 + ((v & 0x0fc0) >> 6);
int c = 0x80 + ((v & 0x3f000) >> 12);
int d = 0x80 + ((v & 0xfc0000) >> 18);
int e = 0x80 + ((v & 0x3f000000) >> 24);
int f = 0xfc + (v >> 30);
s += (char)f;
s += (char)e;
s += (char)d;
s += (char)c;
s += (char)b;
s += (char)a;
}
}
cout << s << endl;
vector<int> u32a;
int i = 0;
int len = s.length();
while (i < len) {
unsigned char a = s[i];
if (a <= 0x7f) {
u32a.push_back(a);
}
else if (a < 0xe0) {
unsigned char b = a;
i++;
a = s[i];
int v = ((b & 0x1f) << 6) + (a & 0x3f);
u32a.push_back(v);
}
else if (a < 0xf0) {
unsigned char c = a;
i++;
unsigned char b = s[i];
i++;
a = s[i];
int v = ((c & 0x0f) << 12) + ((b & 0x3f) << 6) + (a & 0x3f);
u32a.push_back(v);
}
else if (a < 0xf8) {
unsigned char d = a;
i++;
unsigned char c = s[i];
i++;
unsigned char b = s[i];
i++;
a = s[i];
int v = ((d & 0x07) << 18) + ((c & 0x3f) << 12) + ((b & 0x3f) << 6) + (a & 0x3f);
u32a.push_back(v);
}
else if (a < 0xfc) {
unsigned char e = a;
i++;
unsigned char d = s[i];
i++;
unsigned char c = s[i];
i++;
unsigned char b = s[i];
i++;
a = s[i];
int v = ((e & 0x03) << 24) + ((d & 0x3f) << 18) + ((c & 0x3f) << 12) + ((b & 0x3f) << 6) + (a & 0x3f);
u32a.push_back(v);
}
else if (a < 0xfe) {
unsigned char f = a;
i++;
unsigned char e = s[i];
i++;
unsigned char d = s[i];
i++;
unsigned char c = s[i];
i++;
unsigned char b = s[i];
i++;
a = s[i];
int v = ((f & 0x01) << 30) + ((e & 0x3f) << 24) + ((d & 0x3f) << 18) + ((c & 0x3f) << 12) + ((b & 0x3f) << 6) + (a & 0x3f);
u32a.push_back(v);
}
i++;
}
return 0;
}