public int EncodeString(string value, Encoding encoding)
{
Debug.Assert(value != null, "value was null");
Debug.Assert(WriteState != null, "writestate was null");
Debug.Assert(WriteState.Buffer != null, "writestate.buffer was null");
if (encoding == Encoding.Latin1) // we don't need to check for codepoints
{
byte[] buffer = encoding.GetBytes(value);
return(EncodeBytes(buffer, 0, buffer.Length, true, true));
}
// Add Encoding header, if any. e.g. =?encoding?b?
WriteState.AppendHeader();
bool _hasSpecialEncodingForCRLF = HasSpecialEncodingForCRLF;
int totalBytesCount = 0;
byte[] bytes = new byte[encoding.GetMaxByteCount(2)];
for (int i = 0; i < value.Length; ++i)
{
int codepointSize = GetCodepointSize(value, i);
Debug.Assert(codepointSize == 1 || codepointSize == 2, "codepointSize was not 1 or 2");
int bytesCount = encoding.GetBytes(value, i, codepointSize, bytes, 0);
if (codepointSize == 2)
{
++i; // Transformed two chars, so shift the index to account for that
}
if (LineBreakNeeded(bytes, bytesCount))
{
AppendPadding();
WriteState.AppendCRLF(true);
}
if (_hasSpecialEncodingForCRLF && IsCRLF(bytes, bytesCount))
{
AppendEncodedCRLF();
}
else
{
AppendEncodedCodepoint(bytes, bytesCount);
}
totalBytesCount += bytesCount;
}
AppendPadding();
// Write out the last footer, if any. e.g. ?=
WriteState.AppendFooter();
return(totalBytesCount);
}
public int EncodeBytes(byte[] buffer, int offset, int count, bool dontDeferFinalBytes, bool shouldAppendSpaceToCRLF)
{
// Add Encoding header, if any. e.g. =?encoding?b?
WriteState.AppendHeader();
bool _hasSpecialEncodingForCRLF = HasSpecialEncodingForCRLF;
int cur = offset;
for (; cur < count + offset; cur++)
{
if (LineBreakNeeded(buffer[cur]))
{
AppendPadding();
WriteState.AppendCRLF(shouldAppendSpaceToCRLF);
}
if (_hasSpecialEncodingForCRLF && IsCRLF(buffer, cur, count + offset))
{
AppendEncodedCRLF();
cur++; // Transformed two chars, so shift the index to account for that
}
else
{
ApppendEncodedByte(buffer[cur]);
}
}
if (dontDeferFinalBytes)
{
AppendPadding();
}
// Write out the last footer, if any. e.g. ?=
WriteState.AppendFooter();
return(cur - offset);
}