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// **********************************************************************
//
// Copyright (c) 2001
// MutableRealms, Inc.
// Huntsville, AL, USA
//
// All Rights Reserved
//
// **********************************************************************
#include <IceUtil/Unicode.h>
#include <algorithm>
using namespace std;
string
IceUtil::wstringToString(const wstring& str)
{
string result;
result.reserve(str.length() * 2);
for (unsigned int i = 0; i < str.length(); ++i)
{
wchar_t wc;
wc = str[i];
if (wc < 0x80)
{
result += static_cast<char>(wc);
}
else if (wc < 0x800)
{
result += 0xc0 | (wc>>6);
result += 0x80 | (wc & 0x3f);
}
else if (wc < 0x10000)
{
result += 0xe0 | (wc>>12);
result += 0x80 | ((wc>>6) & 0x3f);
result += 0x80 | (wc & 0x3f);
}
else if (wc < 0x10FFFF)
{
result += 0xf0 | (wc>>18);
result += 0x80 | ((wc>>12) & 0x3f);
result += 0x80 | ((wc>>6) & 0x3f);
result += 0x80 | (wc & 0x3f);
}
else
{
return result; // Error, not encodable.
}
}
return result;
}
wstring
IceUtil::stringToWstring(const string& str)
{
wstring result;
result.reserve(str.length());
unsigned int len;
for (unsigned int i = 0; i < str.length(); i += len)
{
unsigned char c = str[i];
wchar_t wc;
int minval;
if (c < 0x80)
{
wc = c;
len = 1;
minval = 0;
}
else if (c < 0xc0) // Lead byte must not be 10xxxxxx
{
return result; // Error, not encodable.
}
else if(c < 0xe0) // 110xxxxx
{
wc = c & 0x1f;
len = 2;
minval = 0x80;
}
else if(c < 0xf0) // 1110xxxx
{
wc = c & 0xf;
len = 3;
minval = 0x800;
}
#if SIZEOF_WCHAR_T >= 4
else if(c < 0xf8) // 11110xxx
{
wc = c & 7;
len = 4;
minval = 0x10000;
}
else if (c < 0xfc) // 111110xx
{
// Length 5 and 6 is declared invalid in Unicode 3.1 and ISO 10646:2001.
wc = c & 3;
len = 5;
minval = 0x110000;
}
else if (c < 0xfe) // 1111110x
{
// Length 5 and 6 is declared invalid in Unicode 3.1 and ISO 10646:2001.
wc = c & 1;
len = 6;
minval = 0x4000000;
}
#endif
else
{
return result; // Error, not encodable.
}
if (i + len - 1 < str.length())
{
for (unsigned int j = 1; j < len; ++j)
{
if ((str[i + j] & 0xc0) != 0x80) // All other bytes must be 10xxxxxx
{
return result; // Error, not encodable.
}
wc <<= 6;
wc |= str[i + j] & 0x3f;
}
if (wc < minval)
{
return result; // Error, non-shortest form.
}
else
{
result += wc;
}
}
else
{
return result; // Error, not encodable.
}
}
return result;
}
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