internal static long QuoteAndFold(Stream stream, MimeStringList fragments, uint inputMask, bool quoteOutput, bool addSpaceAtStart, bool allowUTF8, int lastLineReserve, ref MimeStringLength currentLineLength, ref byte[] scratchBuffer)
{
long num = 0L;
Header.LineBuffer lineBuffer = default(Header.LineBuffer);
lineBuffer.Length = new MimeStringLength(0);
lineBuffer.LengthTillLastLWSP = new MimeStringLength(-1);
if (scratchBuffer == null || scratchBuffer.Length < 998)
{
scratchBuffer = new byte[998];
}
lineBuffer.Bytes = scratchBuffer;
MimeScan.Token token = quoteOutput ? (MimeScan.Token.Spec | MimeScan.Token.Fwsp) : MimeScan.Token.Fwsp;
bool flag = false;
if (addSpaceAtStart && currentLineLength.InBytes != 0)
{
num += Header.WriteToken(Header.Space, 0, new MimeStringLength(1), stream, ref currentLineLength, ref lineBuffer, ref flag, allowUTF8);
flag = true;
}
if (quoteOutput)
{
num += Header.WriteToken(Header.DoubleQuote, 0, new MimeStringLength(1), stream, ref currentLineLength, ref lineBuffer, ref flag, allowUTF8);
}
for (int i = 0; i < fragments.Count; i++)
{
MimeString mimeString = fragments[i];
int num2 = 0;
int num3 = 0;
byte[] data = mimeString.GetData(out num2, out num3);
if ((mimeString.Mask & inputMask) != 0U)
{
do
{
int valueInChars = 0;
int num4 = MimeScan.FindNextOf(token, data, num2, num3, out valueInChars, allowUTF8);
if (num4 > 0)
{
num += Header.WriteToken(data, num2, new MimeStringLength(valueInChars, num4), stream, ref currentLineLength, ref lineBuffer, ref flag, allowUTF8);
num2 += num4;
num3 -= num4;
}
if (num3 != 0)
{
byte b = data[num2];
if ((b == 34 || b == 92) && (mimeString.Mask & 3758096383U) != 0U)
{
num += Header.WriteToken(new byte[]
{
92,
data[num2]
}, 0, new MimeStringLength(2), stream, ref currentLineLength, ref lineBuffer, ref flag, allowUTF8);
num2++;
num3--;
}
else
{
num += Header.WriteToken(new byte[]
{
data[num2]
}, 0, new MimeStringLength(1), stream, ref currentLineLength, ref lineBuffer, ref flag, allowUTF8);
num2++;
num3--;
}
}
}while (num3 != 0);
}
}
if (quoteOutput)
{
num += Header.WriteToken(Header.DoubleQuote, 0, new MimeStringLength(1), stream, ref currentLineLength, ref lineBuffer, ref flag, allowUTF8);
}
if (lastLineReserve > 0)
{
num += Header.WriteToken(null, 0, new MimeStringLength(lastLineReserve), stream, ref currentLineLength, ref lineBuffer, ref flag, allowUTF8);
}
if (lineBuffer.Length.InBytes > 0)
{
stream.Write(lineBuffer.Bytes, 0, lineBuffer.Length.InBytes);
num += (long)lineBuffer.Length.InBytes;
currentLineLength.IncrementBy(lineBuffer.Length);
}
return(num);
}
private static long WriteToken(byte[] token, int tokenOffset, MimeStringLength tokenLength, Stream stream, ref MimeStringLength currentLineLength, ref Header.LineBuffer lineBuffer, ref bool autoAddedLastLWSP, bool allowUTF8)
{
long num = 0L;
bool flag = token != null && tokenLength.InChars == 1 && MimeScan.IsFWSP(token[tokenOffset]);
if (!flag && currentLineLength.InChars + lineBuffer.Length.InChars + tokenLength.InChars > 78 && lineBuffer.LengthTillLastLWSP.InBytes >= 0)
{
if (lineBuffer.LengthTillLastLWSP.InBytes > 0)
{
stream.Write(lineBuffer.Bytes, 0, lineBuffer.LengthTillLastLWSP.InBytes);
num += (long)lineBuffer.LengthTillLastLWSP.InBytes;
currentLineLength.IncrementBy(lineBuffer.LengthTillLastLWSP);
}
if (currentLineLength.InBytes > 0)
{
num += Header.WriteLineEnd(stream, ref currentLineLength);
}
if (autoAddedLastLWSP)
{
autoAddedLastLWSP = false;
lineBuffer.LengthTillLastLWSP.IncrementBy(1);
}
if (lineBuffer.LengthTillLastLWSP.InBytes != lineBuffer.Length.InBytes)
{
Buffer.BlockCopy(lineBuffer.Bytes, lineBuffer.LengthTillLastLWSP.InBytes, lineBuffer.Bytes, 0, lineBuffer.Length.InBytes - lineBuffer.LengthTillLastLWSP.InBytes);
lineBuffer.Length.DecrementBy(lineBuffer.LengthTillLastLWSP);
if (lineBuffer.Length.InBytes > 0 && MimeScan.IsFWSP(lineBuffer.Bytes[0]))
{
lineBuffer.LengthTillLastLWSP.SetAs(0);
}
else
{
lineBuffer.LengthTillLastLWSP.SetAs(-1);
}
}
else
{
lineBuffer.Length.SetAs(0);
lineBuffer.LengthTillLastLWSP.SetAs(-1);
}
bool flag2 = false;
if (lineBuffer.Length.InBytes > 0)
{
if (!MimeScan.IsFWSP(lineBuffer.Bytes[0]))
{
flag2 = true;
}
}
else if (!flag)
{
flag2 = true;
}
if (flag2)
{
stream.Write(Header.LineStartWhitespace, 0, Header.LineStartWhitespace.Length);
num += (long)Header.LineStartWhitespace.Length;
currentLineLength.IncrementBy(Header.LineStartWhitespace.Length);
}
}
if (currentLineLength.InBytes + lineBuffer.Length.InBytes + tokenLength.InBytes > 998)
{
if (lineBuffer.Length.InBytes > 0)
{
stream.Write(lineBuffer.Bytes, 0, lineBuffer.Length.InBytes);
num += (long)lineBuffer.Length.InBytes;
currentLineLength.IncrementBy(lineBuffer.Length);
lineBuffer.Length.SetAs(0);
autoAddedLastLWSP = false;
lineBuffer.LengthTillLastLWSP.SetAs(-1);
}
if (token != null)
{
while (currentLineLength.InBytes + tokenLength.InBytes > 998)
{
int num2 = Math.Max(0, 998 - currentLineLength.InBytes);
int num3 = 0;
int num4 = 0;
if (allowUTF8)
{
int num5;
for (int i = 0; i < tokenLength.InBytes; i += num5)
{
byte b = token[tokenOffset + i];
num5 = 1;
if (b >= 128 && !MimeScan.IsUTF8NonASCII(token, tokenOffset + i, tokenOffset + tokenLength.InBytes, out num5))
{
num5 = 1;
}
if (num4 + num5 > num2)
{
break;
}
num3++;
num4 += num5;
}
}
else
{
num3 = num2;
num4 = num2;
}
stream.Write(token, tokenOffset, num4);
num += (long)num4;
currentLineLength.IncrementBy(num3, num4);
tokenOffset += num4;
tokenLength.DecrementBy(num3, num4);
num += Header.WriteLineEnd(stream, ref currentLineLength);
if (!flag)
{
stream.Write(Header.LineStartWhitespace, 0, Header.LineStartWhitespace.Length);
num += (long)Header.LineStartWhitespace.Length;
currentLineLength.IncrementBy(Header.LineStartWhitespace.Length);
}
}
}
}
if (token != null)
{
Buffer.BlockCopy(token, tokenOffset, lineBuffer.Bytes, lineBuffer.Length.InBytes, tokenLength.InBytes);
if (flag && (lineBuffer.Length.InBytes == 0 || !MimeScan.IsFWSP(lineBuffer.Bytes[lineBuffer.Length.InBytes - 1])))
{
autoAddedLastLWSP = false;
lineBuffer.LengthTillLastLWSP.SetAs(lineBuffer.Length);
}
lineBuffer.Length.IncrementBy(tokenLength);
}
return(num);
}