private static string chunksToString(List <chunk> chunks)
{
var result = new StringBuilder();
int lineLength = 0;
foreach (var chunk in chunks)
{
// RFC 2047: An 'encoded-word' may not be more than 75 characters long. Each line of a header field that contains one or more 'encoded-word's is limited to 76 characters.
if (chunk.Text != null)
{
result.Append(chunk.Text);
lineLength += chunk.Text.Length;
while (lineLength > 76)
{
wrap(result, ref lineLength, 76);
}
}
else // chunk.Base64 != null
{
// base-64 chunks must be surrounded by "=?utf-8?B?" and followed by "?=". It can be split anywhere except across a UTF-8 sequence.
// The minimum space occupied by an encoded-word is 16 characters (because the base64 has to be padded, so min. 4 chars)
// This min. length (16 chars) is also guaranteed to be achievable because even the longest unicode sequences can be encoded in four base64 characters.
int pos = 0;
while (pos < chunk.Base64.Length)
{
// The first time round is special, because it's the only time when we might wrap _before_ adding a chunk
if (pos == 0 && lineLength > 76 - 16)
{
wrap(result, ref lineLength, 76);
}
// Figure out how many bytes we can add. Every 3 bytes take 4 characters.
int bytes = Math.Min(chunk.Base64.Length - pos, (76 - lineLength - 12) / 4 * 3);
Ut.Assert(bytes > 0);
// Now move backwards until we hit a utf8 boundary
while (pos + bytes < chunk.Base64.Length && chunk.Base64[pos + bytes] >= 0x80 && chunk.Base64[pos + bytes] < 0xC0)
{
bytes--;
}
Ut.Assert(bytes > 0);
// Add them!
lineLength -= result.Length; // coupled with the next change, this increments lineLength by how many chars we're about to append.
result.Append("=?UTF-8?B?");
result.Append(Convert.ToBase64String(chunk.Base64, pos, bytes));
result.Append("?=");
lineLength += result.Length;
pos += bytes;
// If we have any bytes left, we must wrap, because that's the only reason we would ever not append everything
if (pos < chunk.Base64.Length)
{
result.Append("\r\n ");
lineLength = 1;
}
}
}
}
return(result.ToString());
}
public byte[] GetEntireOutput()
{
Ut.Assert(_captureEntire);
var result = new byte[_chunks.Sum(ch => ch.Length)];
int offset = 0;
foreach (var chunk in _chunks)
{
Buffer.BlockCopy(chunk.Data, 0, result, offset, chunk.Length);
offset += chunk.Length;
}
return(result);
}
private void readComplete(IAsyncResult result, Stream stream)
{
int bytesRead = stream.EndRead(result);
var chunk = _chunks[_chunks.Count - 1];
chunk.Length += bytesRead;
if (_dataEvent != null)
{
var newBytes = new byte[bytesRead];
Array.Copy(chunk.Data, chunk.Length - bytesRead, newBytes, 0, bytesRead);
_dataEvent(newBytes);
}
if (_textEvent != null)
{
var newChars = new char[bytesRead + 1]; // can have at most one char buffered up in the decoder, plus bytesRead new chars
int bytesUsed, charsUsed;
bool completed;
_decoder.Convert(chunk.Data, chunk.Length - bytesRead, bytesRead, newChars, 0, newChars.Length, false, out bytesUsed, out charsUsed, out completed);
Ut.Assert(completed); // it could still be halfway through a character; what this means is that newChars was large enough to accommodate everything
_textEvent(new string(newChars, 0, charsUsed));
}
if (bytesRead > 0) // continue reading
{
ReadBegin(stream);
}
else
{
Ended = true;
if (_textEvent != null)
{
var newChars = new char[1];
int bytesUsed, charsUsed;
bool completed;
_decoder.Convert(new byte[0], 0, 0, newChars, 0, newChars.Length, true, out bytesUsed, out charsUsed, out completed);
Ut.Assert(completed);
if (charsUsed > 0)
{
_textEvent(new string(newChars, 0, charsUsed));
}
}
}
}
private void processExited(object sender, EventArgs e)
{
Ut.Assert(_process.HasExited);
while (!_stdoutReader.Ended || !_stderrReader.Ended)
{
Thread.Sleep(20);
}
Ut.Assert(_stdoutReader.Ended);
Ut.Assert(_stderrReader.Ended);
if (_captureEntireStdout)
{
_entireStdout = _stdoutReader.GetEntireOutput();
}
if (_captureEntireStderr)
{
_entireStderr = _stderrReader.GetEntireOutput();
}
lock (_lock)
{
_pauseTimerDue = null;
if (_pauseTimer != null)
{
_pauseTimer.Dispose();
}
}
_exitCode = _process.ExitCode;
if (State != CommandRunnerState.Aborted)
{
State = CommandRunnerState.Exited;
}
_startInfo = null;
_process.Exited -= processExited;
_process = null;
if (CommandEnded != null)
{
CommandEnded();
}
_ended.Set();
}
private static void wrap(StringBuilder text, ref int lineLength, int maxLineLength)
{
Ut.Assert(text.Length > 0);
// This method MAY be called with a lineLength less than the max line length.
// It MUST add a line wrap, ideally before the max line length, but if not possible then after the max length, possibly even at the very end of the text.
// If the line already fits within max line length, just insert a newline at the very end and be done
if (lineLength <= maxLineLength)
{
lineLength = 1;
text.Append("\r\n ");
return;
}
// First search back from the max line length position for a wrappable location
int pos = text.Length - lineLength + maxLineLength; // "pos < text.Length" is guaranteed by the test above
while (true)
{
if (pos < (text.Length - lineLength) || text[pos] == '\n') // exit if we've reached the start of the current line
{
pos = -1;
break;
}
if (text[pos] == ' ')
{
break;
}
pos--;
}
// If that worked, make sure it isn't all spaces until the start of the line
if (pos >= 0)
{
int pos2 = pos;
while (true)
{
pos2--;
if (pos2 < (text.Length - lineLength) || text[pos2] == '\n')
{
pos = -1; // found nothing but spaces until the start of the line
break;
}
if (text[pos2] != ' ')
{
break; // found a non-space, so OK to wrap at "pos"
}
}
}
// If that failed, seek forward
if (pos < 0)
{
pos = text.Length - lineLength + maxLineLength + 1;
while (true)
{
if (pos >= text.Length)
{
break;
}
if (text[pos] == ' ')
{
break;
}
pos++;
}
}
// Insert \r\n at "pos", which either points at the space that becomes the (mandatory) indent for the next line, or is at the very end of the line
if (pos >= text.Length)
{
lineLength = 1;
text.Append("\r\n ");
}
else
{
lineLength = text.Length - pos;
text.Insert(pos, "\r\n");
}
}