private int GetGreaterThanCharEntity(int offset, int length)
{
byte[] buffer = _buffer;
if (length != 4 ||
buffer[offset + 1] != (byte)'g' ||
buffer[offset + 2] != (byte)'t')
{
XmlExceptionHelper.ThrowInvalidCharRef(_reader);
}
return((int)'>');
}
private int GetAmpersandCharEntity(int offset, int length)
{
byte[] buffer = _buffer;
if (length != 5 ||
buffer[offset + 1] != (byte)'a' ||
buffer[offset + 2] != (byte)'m' ||
buffer[offset + 3] != (byte)'p')
{
XmlExceptionHelper.ThrowInvalidCharRef(_reader);
}
return((int)'&');
}
private int GetApostropheCharEntity(int offset, int length)
{
byte[] buffer = _buffer;
if (length != 6 ||
buffer[offset + 1] != (byte)'a' ||
buffer[offset + 2] != (byte)'p' ||
buffer[offset + 3] != (byte)'o' ||
buffer[offset + 4] != (byte)'s')
{
XmlExceptionHelper.ThrowInvalidCharRef(_reader);
}
return((int)'\'');
}
private int GetQuoteCharEntity(int offset, int length)
{
byte[] buffer = _buffer;
if (length != 6 ||
buffer[offset + 1] != (byte)'q' ||
buffer[offset + 2] != (byte)'u' ||
buffer[offset + 3] != (byte)'o' ||
buffer[offset + 4] != (byte)'t')
{
XmlExceptionHelper.ThrowInvalidCharRef(_reader);
}
return((int)'"');
}
public int GetCharEntity(int offset, int length)
{
if (length < 3)
{
XmlExceptionHelper.ThrowInvalidCharRef(_reader);
}
byte[] buffer = _buffer;
DiagnosticUtility.DebugAssert(buffer[offset] == '&', "");
DiagnosticUtility.DebugAssert(buffer[offset + length - 1] == ';', "");
switch (buffer[offset + 1])
{
case (byte)'l':
return(GetLessThanCharEntity(offset, length));
case (byte)'g':
return(GetGreaterThanCharEntity(offset, length));
case (byte)'a':
if (buffer[offset + 2] == (byte)'m')
{
return(GetAmpersandCharEntity(offset, length));
}
else
{
return(GetApostropheCharEntity(offset, length));
}
case (byte)'q':
return(GetQuoteCharEntity(offset, length));
case (byte)'#':
if (buffer[offset + 2] == (byte)'x')
{
return(GetHexCharEntity(offset, length));
}
else
{
return(GetDecimalCharEntity(offset, length));
}
default:
XmlExceptionHelper.ThrowInvalidCharRef(_reader);
return(0);
}
}
private int GetHexCharEntity(int offset, int length)
{
byte[] buffer = _buffer;
DiagnosticUtility.DebugAssert(buffer[offset + 0] == '&', "");
DiagnosticUtility.DebugAssert(buffer[offset + 1] == '#', "");
DiagnosticUtility.DebugAssert(buffer[offset + 2] == 'x', "");
DiagnosticUtility.DebugAssert(buffer[offset + length - 1] == ';', "");
int value = 0;
for (int i = 3; i < length - 1; i++)
{
byte ch = buffer[offset + i];
int digit = 0;
if (ch >= '0' && ch <= '9')
{
digit = (ch - '0');
}
else if (ch >= 'a' && ch <= 'f')
{
digit = 10 + (ch - 'a');
}
else if (ch >= 'A' && ch <= 'F')
{
digit = 10 + (ch - 'A');
}
else
{
XmlExceptionHelper.ThrowInvalidCharRef(_reader);
}
DiagnosticUtility.DebugAssert(digit >= 0 && digit < 16, "");
value = value * 16 + digit;
if (value > SurrogateChar.MaxValue)
{
XmlExceptionHelper.ThrowInvalidCharRef(_reader);
}
}
return(value);
}
private int GetDecimalCharEntity(int offset, int length)
{
byte[] buffer = _buffer;
DiagnosticUtility.DebugAssert(buffer[offset + 0] == '&', "");
DiagnosticUtility.DebugAssert(buffer[offset + 1] == '#', "");
DiagnosticUtility.DebugAssert(buffer[offset + length - 1] == ';', "");
int value = 0;
for (int i = 2; i < length - 1; i++)
{
byte ch = buffer[offset + i];
if (ch < (byte)'0' || ch > (byte)'9')
{
XmlExceptionHelper.ThrowInvalidCharRef(_reader);
}
value = value * 10 + (ch - '0');
if (value > SurrogateChar.MaxValue)
{
XmlExceptionHelper.ThrowInvalidCharRef(_reader);
}
}
return(value);
}