private static bool IsUUEncodeBegin(byte[] data, int line, int nextNL)
{
var mimeString = new MimeString(data, line, nextNL - line);
if (mimeString.Length < 13 || !mimeString.HasPrefixEq(UUBegin, 0, 6))
return false;
var index = 6;
while (index < 10 && (48 <= mimeString[index] && 55 >= mimeString[index]))
++index;
return index != 6 && 32 == mimeString[index];
}
private static bool IsUUEncodeEnd(byte[] data, int line, int nextNL)
{
var mimeString = new MimeString(data, line, nextNL - line);
return mimeString.Length >= 3 && mimeString.HasPrefixEq(UUEnd, 0, 3);
}
private bool IsQuotingRequired(MimeString mimeStr, bool allowUTF8)
{
var writeState = WriteState.Begin;
var mimeString = new MimeString(WordBreakBytes, 0, WordBreakBytes.Length);
int offset;
int count;
var data = mimeStr.GetData(out offset, out count);
while (count != 0) {
switch (writeState) {
case WriteState.Begin:
var characterCount = 0;
var endOf = MimeScan.FindEndOf(MimeScan.Token.Atom, data, offset, count, out characterCount, allowUTF8);
if (endOf == 0) {
if (count <= 3 || offset != 0 || !mimeString.HasPrefixEq(data, 0, 3))
return true;
offset += 3;
count -= 3;
writeState = WriteState.Begin;
continue;
}
offset += endOf;
count -= endOf;
writeState = WriteState.Atom;
continue;
case WriteState.Atom:
if ((count < 2 || data[offset] != 32) && (count < 1 || data[offset] != 46))
return true;
++offset;
--count;
writeState = WriteState.Begin;
continue;
default:
continue;
}
}
return false;
}