private static bool encodeUnescaped(char c, bool fullUri)
{
if (('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z') || ('0' <= c && c <= '9'))
{
return(true);
}
if ("-_.!~*'()".IndexOf((char)c) >= 0)
{
return(true);
}
if (fullUri)
{
return(URI_DECODE_RESERVED.IndexOf((char)c) >= 0);
}
return(false);
}
private static string decode(string str, bool fullUri)
{
char [] buf = null;
int bufTop = 0;
for (int k = 0, length = str.Length; k != length;)
{
char C = str [k];
if (C != '%')
{
if (buf != null)
{
buf [bufTop++] = C;
}
++k;
}
else
{
if (buf == null)
{
// decode always compress so result can not be bigger then
// str.length()
buf = new char [length];
str.ToCharArray(0, k).CopyTo(buf, 0);
bufTop = k;
}
int start = k;
if (k + 3 > length)
{
throw Context.ReportRuntimeErrorById("msg.bad.uri");
}
int B = unHex(str [k + 1], str [k + 2]);
if (B < 0)
{
throw Context.ReportRuntimeErrorById("msg.bad.uri");
}
k += 3;
if ((B & 0x80) == 0)
{
C = (char)B;
}
else
{
// Decode UTF-8 sequence into ucs4Char and encode it into
// UTF-16
int utf8Tail, ucs4Char, minUcs4Char;
if ((B & 0xC0) == 0x80)
{
// First UTF-8 should be ouside 0x80..0xBF
throw Context.ReportRuntimeErrorById("msg.bad.uri");
}
else if ((B & 0x20) == 0)
{
utf8Tail = 1;
ucs4Char = B & 0x1F;
minUcs4Char = 0x80;
}
else if ((B & 0x10) == 0)
{
utf8Tail = 2;
ucs4Char = B & 0x0F;
minUcs4Char = 0x800;
}
else if ((B & 0x08) == 0)
{
utf8Tail = 3;
ucs4Char = B & 0x07;
minUcs4Char = 0x10000;
}
else if ((B & 0x04) == 0)
{
utf8Tail = 4;
ucs4Char = B & 0x03;
minUcs4Char = 0x200000;
}
else if ((B & 0x02) == 0)
{
utf8Tail = 5;
ucs4Char = B & 0x01;
minUcs4Char = 0x4000000;
}
else
{
// First UTF-8 can not be 0xFF or 0xFE
throw Context.ReportRuntimeErrorById("msg.bad.uri");
}
if (k + 3 * utf8Tail > length)
{
throw Context.ReportRuntimeErrorById("msg.bad.uri");
}
for (int j = 0; j != utf8Tail; j++)
{
if (str [k] != '%')
{
throw Context.ReportRuntimeErrorById("msg.bad.uri");
}
B = unHex(str [k + 1], str [k + 2]);
if (B < 0 || (B & 0xC0) != 0x80)
{
throw Context.ReportRuntimeErrorById("msg.bad.uri");
}
ucs4Char = (ucs4Char << 6) | (B & 0x3F);
k += 3;
}
// Check for overlongs and other should-not-present codes
if (ucs4Char < minUcs4Char || ucs4Char == 0xFFFE || ucs4Char == 0xFFFF)
{
ucs4Char = 0xFFFD;
}
if (ucs4Char >= 0x10000)
{
ucs4Char -= 0x10000;
if (ucs4Char > 0xFFFFF)
{
throw Context.ReportRuntimeErrorById("msg.bad.uri");
}
char H = (char)(((int)((uint)ucs4Char >> 10)) + 0xD800);
C = (char)((ucs4Char & 0x3FF) + 0xDC00);
buf [bufTop++] = H;
}
else
{
C = (char)ucs4Char;
}
}
if (fullUri && URI_DECODE_RESERVED.IndexOf((char)C) >= 0)
{
for (int x = start; x != k; x++)
{
buf [bufTop++] = str [x];
}
}
else
{
buf [bufTop++] = C;
}
}
}
return((buf == null) ? str : new string (buf, 0, bufTop));
}
