Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Mail / QEncodedStream.cs / 1305376 / QEncodedStream.cs
///
/// This stream performs in-place decoding of quoted-printable
/// encoded streams used in headers. Encoding requires copying into a separate
/// buffer as the data being encoded will most likely grow.
/// Encoding and decoding is done transparently to the caller.
/// this class is meant to be used when RFC 2047 quoted stream encoding
///is needed. This is for headers such as subject and should NOT be
///used for email body
///
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
namespace System.Net.Mime
{
using System;
using System.IO;
using System.Text;
///
/// This stream performs in-place decoding of quoted-printable
/// encoded streams. Encoding requires copying into a separate
/// buffer as the data being encoded will most likely grow.
/// Encoding and decoding is done transparently to the caller.
///
internal class QEncodedStream : DelegatedStream, IEncodableStream
{
//folding takes up 5 characters
const int sizeOfFoldingCRLF = 5;
//it takes six chars to encode a CRLF
const int sizeOfEncodedCRLF = 6;
//it takes three chars to encode a non-ascii character
const int sizeOfEncodedChar = 3;
static byte[] hexDecodeMap = new byte[] {// 0 1 2 3 4 5 6 7 8 9 A B C D E F
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 0
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 1
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 2
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,255,255,255,255,255,255, // 3
255, 10, 11, 12, 13, 14, 15,255,255,255,255,255,255,255,255,255, // 4
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 5
255, 10, 11, 12, 13, 14, 15,255,255,255,255,255,255,255,255,255, // 6
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 7
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 8
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 9
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // A
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // B
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // C
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // D
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // E
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // F
};
//bytes that correspond to the hex char representations in ASCII (0-9, A-F)
static byte[] hexEncodeMap = new byte[] { 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 65, 66, 67, 68, 69, 70 };
int lineLength;
ReadStateInfo readState;
QuotedStringWriteStateInfo writeState;
///
/// ctor.
///
/// Underlying stream
/// Preferred maximum line-length for writes
internal QEncodedStream(Stream stream, int lineLength)
: base(stream)
{
if (lineLength < 0)
throw new ArgumentOutOfRangeException("lineLength");
this.lineLength = lineLength;
}
internal QEncodedStream(Stream stream)
: this(stream, EncodedStreamFactory.DefaultMaxLineLength)
{
}
internal QEncodedStream(QuotedStringWriteStateInfo wsi)
{
this.lineLength = EncodedStreamFactory.DefaultMaxLineLength;
this.writeState = wsi;
}
internal QEncodedStream(int lineLength)
{
this.lineLength = lineLength;
}
ReadStateInfo ReadState
{
get
{
if (this.readState == null)
this.readState = new ReadStateInfo();
return this.readState;
}
}
internal WriteStateInfoBase WriteState
{
get
{
if (this.writeState == null)
this.writeState = new QuotedStringWriteStateInfo(1024, null, null, 76);
return this.writeState;
}
}
public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
{
if (buffer == null)
throw new ArgumentNullException("buffer");
if (offset < 0 || offset > buffer.Length)
throw new ArgumentOutOfRangeException("offset");
if (offset + count > buffer.Length)
throw new ArgumentOutOfRangeException("count");
WriteAsyncResult result = new WriteAsyncResult(this, buffer, offset, count, callback, state);
result.Write();
return result;
}
public override void Close()
{
FlushInternal();
base.Close();
}
public int DecodeBytes(byte[] buffer, int offset, int count)
{
unsafe
{
fixed (byte* pBuffer = buffer)
{
byte* start = pBuffer + offset;
byte* source = start;
byte* dest = start;
byte* end = start + count;
// if the last read ended in a partially decoded
// sequence, pick up where we left off.
if (ReadState.IsEscaped)
{
// this will be -1 if the previous read ended
// with an escape character.
if (ReadState.Byte == -1)
{
// if we only read one byte from the underlying
// stream, we'll need to save the byte and
// ask for more.
if (count == 1)
{
ReadState.Byte = *source;
return 0;
}
// '=\r\n' means a soft (aka. invisible) CRLF sequence...
if (source[0] != '\r' || source[1] != '\n')
{
byte b1 = hexDecodeMap[source[0]];
byte b2 = hexDecodeMap[source[1]];
if (b1 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b1));
if (b2 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b2));
*dest++ = (byte)((b1 << 4) + b2);
}
source += 2;
}
else
{
// '=\r\n' means a soft (aka. invisible) CRLF sequence...
if (ReadState.Byte != '\r' || *source != '\n')
{
byte b1 = hexDecodeMap[ReadState.Byte];
byte b2 = hexDecodeMap[*source];
if (b1 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b1));
if (b2 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b2));
*dest++ = (byte)((b1 << 4) + b2);
}
source++;
}
// reset state for next read.
ReadState.IsEscaped = false;
ReadState.Byte = -1;
}
// Here's where most of the decoding takes place.
// We'll loop around until we've inspected all the
// bytes read.
while (source < end)
{
// if the source is not an escape character, then
// just copy as-is.
if (*source != '=')
{
if (*source == '_')
{
*dest++ = (byte)' ';
source++;
}
else
{
*dest++ = *source++;
}
}
else
{
// determine where we are relative to the end
// of the data. If we don't have enough data to
// decode the escape sequence, save off what we
// have and continue the decoding in the next
// read. Otherwise, decode the data and copy
// into dest.
switch (end - source)
{
case 2:
ReadState.Byte = source[1];
goto case 1;
case 1:
ReadState.IsEscaped = true;
goto EndWhile;
default:
if (source[1] != '\r' || source[2] != '\n')
{
byte b1 = hexDecodeMap[source[1]];
byte b2 = hexDecodeMap[source[2]];
if (b1 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b1));
if (b2 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b2));
*dest++ = (byte)((b1 << 4) + b2);
}
source += 3;
break;
}
}
}
EndWhile:
count = (int)(dest - start);
}
}
return count;
}
public int EncodeBytes(byte[] buffer, int offset, int count)
{
writeState.CurrentLineLength += writeState.HeaderLength + writeState.MimeHeaderLength;
//add the header initially
writeState.AppendHeader();
int cur = offset;
for (; cur < count + offset; cur++)
{
//only fold if we're before a whitespace or if it's too long to keep writing
if (lineLength != -1 && (WriteState.CurrentLineLength + sizeOfFoldingCRLF >= this.lineLength && (buffer[cur] == ' ' ||
buffer[cur] == '\t' || buffer[cur] == '\r' || buffer[cur] == '\n')) ||
WriteState.CurrentLineLength + writeState.FooterLength >= lineLength
)
{
if (WriteState.Buffer.Length - WriteState.Length < WriteState.FooterLength)
WriteState.ResizeBuffer();
WriteState.AppendFooter();
WriteState.Buffer[WriteState.Length++] = (byte)'\r';
WriteState.Buffer[WriteState.Length++] = (byte)'\n';
WriteState.Buffer[WriteState.Length++] = (byte)' ';
WriteState.AppendHeader();
WriteState.CurrentLineLength = WriteState.HeaderLength;
}
//need to dot stuff - rfc 2821 4.5.2 Transparency
if (WriteState.CurrentLineLength == 0 && buffer[cur] == '.')
{
WriteState.Buffer[WriteState.Length++] = (byte)'.';
}
//always encode CRLF
if (buffer[cur] == '\r' && cur + 1 < count + offset && buffer[cur + 1] == '\n')
{
//six bytes to encode CRLF needed
if (WriteState.Buffer.Length - WriteState.Length < sizeOfEncodedCRLF)
WriteState.ResizeBuffer();
cur++;
//the encoding for CRLF is =0D=0A
WriteState.Buffer[WriteState.Length++] = (byte)'=';
WriteState.Buffer[WriteState.Length++] = (byte)'0';
WriteState.Buffer[WriteState.Length++] = (byte)'D';
WriteState.Buffer[WriteState.Length++] = (byte)'=';
WriteState.Buffer[WriteState.Length++] = (byte)'0';
WriteState.Buffer[WriteState.Length++] = (byte)'A';
WriteState.CurrentLineLength += sizeOfEncodedCRLF;
}
else if ((buffer[cur] < 32 && buffer[cur] != '\t') ||
buffer[cur] == '=' ||
buffer[cur] > 126)
{
if (WriteState.Buffer.Length - WriteState.Length < sizeOfEncodedChar)
WriteState.ResizeBuffer();
WriteState.CurrentLineLength += sizeOfEncodedChar;
//append an = to indicate an encoded character
WriteState.Buffer[WriteState.Length++] = (byte)'=';
//shift 4 to get the first four bytes only and look up the hex digit
WriteState.Buffer[WriteState.Length++] = hexEncodeMap[buffer[cur] >> 4];
//clear the first four bytes to get the last four and look up the hex digit
WriteState.Buffer[WriteState.Length++] = hexEncodeMap[buffer[cur] & 0xF];
}
else if (buffer[cur] == ' ')
{
if (WriteState.Buffer.Length - WriteState.Length < 1)
WriteState.ResizeBuffer();
//spaces should be escaped as either '_' or '=20' and
//we have chosen '_' for parity with other email client
//behavior
WriteState.CurrentLineLength++;
WriteState.Buffer[WriteState.Length++] = (byte)'_';
}
else
{
if (WriteState.Buffer.Length - WriteState.Length < 1)
WriteState.ResizeBuffer();
WriteState.CurrentLineLength++;
WriteState.Buffer[WriteState.Length++] = buffer[cur];
}
}
WriteState.AppendFooter();
return cur - offset;
}
public Stream GetStream()
{
return this;
}
public string GetEncodedString()
{
return ASCIIEncoding.ASCII.GetString(this.WriteState.Buffer, 0, this.WriteState.Length);
}
public override void EndWrite(IAsyncResult asyncResult)
{
WriteAsyncResult.End(asyncResult);
}
public override void Flush()
{
FlushInternal();
base.Flush();
}
void FlushInternal()
{
if (this.writeState != null && this.writeState.Length > 0)
{
base.Write(WriteState.Buffer, 0, WriteState.Length);
WriteState.Length = 0;
}
}
public override void Write(byte[] buffer, int offset, int count)
{
if (buffer == null)
throw new ArgumentNullException("buffer");
if (offset < 0 || offset > buffer.Length)
throw new ArgumentOutOfRangeException("offset");
if (offset + count > buffer.Length)
throw new ArgumentOutOfRangeException("count");
int written = 0;
for (; ; )
{
written += EncodeBytes(buffer, offset + written, count - written);
if (written < count)
FlushInternal();
else
break;
}
}
class ReadStateInfo
{
bool isEscaped = false;
short b1 = -1;
internal bool IsEscaped
{
get { return this.isEscaped; }
set { this.isEscaped = value; }
}
internal short Byte
{
get { return this.b1; }
set { this.b1 = value; }
}
}
class WriteAsyncResult : LazyAsyncResult
{
QEncodedStream parent;
byte[] buffer;
int offset;
int count;
static AsyncCallback onWrite = new AsyncCallback(OnWrite);
int written;
internal WriteAsyncResult(QEncodedStream parent, byte[] buffer, int offset, int count, AsyncCallback callback, object state)
: base(null, state, callback)
{
this.parent = parent;
this.buffer = buffer;
this.offset = offset;
this.count = count;
}
void CompleteWrite(IAsyncResult result)
{
this.parent.BaseStream.EndWrite(result);
this.parent.WriteState.Length = 0;
}
internal static void End(IAsyncResult result)
{
WriteAsyncResult thisPtr = (WriteAsyncResult)result;
thisPtr.InternalWaitForCompletion();
System.Diagnostics.Debug.Assert(thisPtr.written == thisPtr.count);
}
static void OnWrite(IAsyncResult result)
{
if (!result.CompletedSynchronously)
{
WriteAsyncResult thisPtr = (WriteAsyncResult)result.AsyncState;
try
{
thisPtr.CompleteWrite(result);
thisPtr.Write();
}
catch (Exception e)
{
thisPtr.InvokeCallback(e);
}
}
}
internal void Write()
{
for (; ; )
{
this.written += this.parent.EncodeBytes(this.buffer, this.offset + this.written, this.count - this.written);
if (this.written < this.count)
{
IAsyncResult result = this.parent.BaseStream.BeginWrite(this.parent.WriteState.Buffer, 0, this.parent.WriteState.Length, onWrite, this);
if (!result.CompletedSynchronously)
break;
CompleteWrite(result);
}
else
{
InvokeCallback();
break;
}
}
}
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
///
/// This stream performs in-place decoding of quoted-printable
/// encoded streams used in headers. Encoding requires copying into a separate
/// buffer as the data being encoded will most likely grow.
/// Encoding and decoding is done transparently to the caller.
/// this class is meant to be used when RFC 2047 quoted stream encoding
///is needed. This is for headers such as subject and should NOT be
///used for email body
///
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
namespace System.Net.Mime
{
using System;
using System.IO;
using System.Text;
///
/// This stream performs in-place decoding of quoted-printable
/// encoded streams. Encoding requires copying into a separate
/// buffer as the data being encoded will most likely grow.
/// Encoding and decoding is done transparently to the caller.
///
internal class QEncodedStream : DelegatedStream, IEncodableStream
{
//folding takes up 5 characters
const int sizeOfFoldingCRLF = 5;
//it takes six chars to encode a CRLF
const int sizeOfEncodedCRLF = 6;
//it takes three chars to encode a non-ascii character
const int sizeOfEncodedChar = 3;
static byte[] hexDecodeMap = new byte[] {// 0 1 2 3 4 5 6 7 8 9 A B C D E F
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 0
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 1
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 2
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,255,255,255,255,255,255, // 3
255, 10, 11, 12, 13, 14, 15,255,255,255,255,255,255,255,255,255, // 4
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 5
255, 10, 11, 12, 13, 14, 15,255,255,255,255,255,255,255,255,255, // 6
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 7
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 8
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // 9
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // A
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // B
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // C
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // D
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // E
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, // F
};
//bytes that correspond to the hex char representations in ASCII (0-9, A-F)
static byte[] hexEncodeMap = new byte[] { 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 65, 66, 67, 68, 69, 70 };
int lineLength;
ReadStateInfo readState;
QuotedStringWriteStateInfo writeState;
///
/// ctor.
///
/// Underlying stream
/// Preferred maximum line-length for writes
internal QEncodedStream(Stream stream, int lineLength)
: base(stream)
{
if (lineLength < 0)
throw new ArgumentOutOfRangeException("lineLength");
this.lineLength = lineLength;
}
internal QEncodedStream(Stream stream)
: this(stream, EncodedStreamFactory.DefaultMaxLineLength)
{
}
internal QEncodedStream(QuotedStringWriteStateInfo wsi)
{
this.lineLength = EncodedStreamFactory.DefaultMaxLineLength;
this.writeState = wsi;
}
internal QEncodedStream(int lineLength)
{
this.lineLength = lineLength;
}
ReadStateInfo ReadState
{
get
{
if (this.readState == null)
this.readState = new ReadStateInfo();
return this.readState;
}
}
internal WriteStateInfoBase WriteState
{
get
{
if (this.writeState == null)
this.writeState = new QuotedStringWriteStateInfo(1024, null, null, 76);
return this.writeState;
}
}
public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
{
if (buffer == null)
throw new ArgumentNullException("buffer");
if (offset < 0 || offset > buffer.Length)
throw new ArgumentOutOfRangeException("offset");
if (offset + count > buffer.Length)
throw new ArgumentOutOfRangeException("count");
WriteAsyncResult result = new WriteAsyncResult(this, buffer, offset, count, callback, state);
result.Write();
return result;
}
public override void Close()
{
FlushInternal();
base.Close();
}
public int DecodeBytes(byte[] buffer, int offset, int count)
{
unsafe
{
fixed (byte* pBuffer = buffer)
{
byte* start = pBuffer + offset;
byte* source = start;
byte* dest = start;
byte* end = start + count;
// if the last read ended in a partially decoded
// sequence, pick up where we left off.
if (ReadState.IsEscaped)
{
// this will be -1 if the previous read ended
// with an escape character.
if (ReadState.Byte == -1)
{
// if we only read one byte from the underlying
// stream, we'll need to save the byte and
// ask for more.
if (count == 1)
{
ReadState.Byte = *source;
return 0;
}
// '=\r\n' means a soft (aka. invisible) CRLF sequence...
if (source[0] != '\r' || source[1] != '\n')
{
byte b1 = hexDecodeMap[source[0]];
byte b2 = hexDecodeMap[source[1]];
if (b1 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b1));
if (b2 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b2));
*dest++ = (byte)((b1 << 4) + b2);
}
source += 2;
}
else
{
// '=\r\n' means a soft (aka. invisible) CRLF sequence...
if (ReadState.Byte != '\r' || *source != '\n')
{
byte b1 = hexDecodeMap[ReadState.Byte];
byte b2 = hexDecodeMap[*source];
if (b1 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b1));
if (b2 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b2));
*dest++ = (byte)((b1 << 4) + b2);
}
source++;
}
// reset state for next read.
ReadState.IsEscaped = false;
ReadState.Byte = -1;
}
// Here's where most of the decoding takes place.
// We'll loop around until we've inspected all the
// bytes read.
while (source < end)
{
// if the source is not an escape character, then
// just copy as-is.
if (*source != '=')
{
if (*source == '_')
{
*dest++ = (byte)' ';
source++;
}
else
{
*dest++ = *source++;
}
}
else
{
// determine where we are relative to the end
// of the data. If we don't have enough data to
// decode the escape sequence, save off what we
// have and continue the decoding in the next
// read. Otherwise, decode the data and copy
// into dest.
switch (end - source)
{
case 2:
ReadState.Byte = source[1];
goto case 1;
case 1:
ReadState.IsEscaped = true;
goto EndWhile;
default:
if (source[1] != '\r' || source[2] != '\n')
{
byte b1 = hexDecodeMap[source[1]];
byte b2 = hexDecodeMap[source[2]];
if (b1 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b1));
if (b2 == 255)
throw new FormatException(SR.GetString(SR.InvalidHexDigit, b2));
*dest++ = (byte)((b1 << 4) + b2);
}
source += 3;
break;
}
}
}
EndWhile:
count = (int)(dest - start);
}
}
return count;
}
public int EncodeBytes(byte[] buffer, int offset, int count)
{
writeState.CurrentLineLength += writeState.HeaderLength + writeState.MimeHeaderLength;
//add the header initially
writeState.AppendHeader();
int cur = offset;
for (; cur < count + offset; cur++)
{
//only fold if we're before a whitespace or if it's too long to keep writing
if (lineLength != -1 && (WriteState.CurrentLineLength + sizeOfFoldingCRLF >= this.lineLength && (buffer[cur] == ' ' ||
buffer[cur] == '\t' || buffer[cur] == '\r' || buffer[cur] == '\n')) ||
WriteState.CurrentLineLength + writeState.FooterLength >= lineLength
)
{
if (WriteState.Buffer.Length - WriteState.Length < WriteState.FooterLength)
WriteState.ResizeBuffer();
WriteState.AppendFooter();
WriteState.Buffer[WriteState.Length++] = (byte)'\r';
WriteState.Buffer[WriteState.Length++] = (byte)'\n';
WriteState.Buffer[WriteState.Length++] = (byte)' ';
WriteState.AppendHeader();
WriteState.CurrentLineLength = WriteState.HeaderLength;
}
//need to dot stuff - rfc 2821 4.5.2 Transparency
if (WriteState.CurrentLineLength == 0 && buffer[cur] == '.')
{
WriteState.Buffer[WriteState.Length++] = (byte)'.';
}
//always encode CRLF
if (buffer[cur] == '\r' && cur + 1 < count + offset && buffer[cur + 1] == '\n')
{
//six bytes to encode CRLF needed
if (WriteState.Buffer.Length - WriteState.Length < sizeOfEncodedCRLF)
WriteState.ResizeBuffer();
cur++;
//the encoding for CRLF is =0D=0A
WriteState.Buffer[WriteState.Length++] = (byte)'=';
WriteState.Buffer[WriteState.Length++] = (byte)'0';
WriteState.Buffer[WriteState.Length++] = (byte)'D';
WriteState.Buffer[WriteState.Length++] = (byte)'=';
WriteState.Buffer[WriteState.Length++] = (byte)'0';
WriteState.Buffer[WriteState.Length++] = (byte)'A';
WriteState.CurrentLineLength += sizeOfEncodedCRLF;
}
else if ((buffer[cur] < 32 && buffer[cur] != '\t') ||
buffer[cur] == '=' ||
buffer[cur] > 126)
{
if (WriteState.Buffer.Length - WriteState.Length < sizeOfEncodedChar)
WriteState.ResizeBuffer();
WriteState.CurrentLineLength += sizeOfEncodedChar;
//append an = to indicate an encoded character
WriteState.Buffer[WriteState.Length++] = (byte)'=';
//shift 4 to get the first four bytes only and look up the hex digit
WriteState.Buffer[WriteState.Length++] = hexEncodeMap[buffer[cur] >> 4];
//clear the first four bytes to get the last four and look up the hex digit
WriteState.Buffer[WriteState.Length++] = hexEncodeMap[buffer[cur] & 0xF];
}
else if (buffer[cur] == ' ')
{
if (WriteState.Buffer.Length - WriteState.Length < 1)
WriteState.ResizeBuffer();
//spaces should be escaped as either '_' or '=20' and
//we have chosen '_' for parity with other email client
//behavior
WriteState.CurrentLineLength++;
WriteState.Buffer[WriteState.Length++] = (byte)'_';
}
else
{
if (WriteState.Buffer.Length - WriteState.Length < 1)
WriteState.ResizeBuffer();
WriteState.CurrentLineLength++;
WriteState.Buffer[WriteState.Length++] = buffer[cur];
}
}
WriteState.AppendFooter();
return cur - offset;
}
public Stream GetStream()
{
return this;
}
public string GetEncodedString()
{
return ASCIIEncoding.ASCII.GetString(this.WriteState.Buffer, 0, this.WriteState.Length);
}
public override void EndWrite(IAsyncResult asyncResult)
{
WriteAsyncResult.End(asyncResult);
}
public override void Flush()
{
FlushInternal();
base.Flush();
}
void FlushInternal()
{
if (this.writeState != null && this.writeState.Length > 0)
{
base.Write(WriteState.Buffer, 0, WriteState.Length);
WriteState.Length = 0;
}
}
public override void Write(byte[] buffer, int offset, int count)
{
if (buffer == null)
throw new ArgumentNullException("buffer");
if (offset < 0 || offset > buffer.Length)
throw new ArgumentOutOfRangeException("offset");
if (offset + count > buffer.Length)
throw new ArgumentOutOfRangeException("count");
int written = 0;
for (; ; )
{
written += EncodeBytes(buffer, offset + written, count - written);
if (written < count)
FlushInternal();
else
break;
}
}
class ReadStateInfo
{
bool isEscaped = false;
short b1 = -1;
internal bool IsEscaped
{
get { return this.isEscaped; }
set { this.isEscaped = value; }
}
internal short Byte
{
get { return this.b1; }
set { this.b1 = value; }
}
}
class WriteAsyncResult : LazyAsyncResult
{
QEncodedStream parent;
byte[] buffer;
int offset;
int count;
static AsyncCallback onWrite = new AsyncCallback(OnWrite);
int written;
internal WriteAsyncResult(QEncodedStream parent, byte[] buffer, int offset, int count, AsyncCallback callback, object state)
: base(null, state, callback)
{
this.parent = parent;
this.buffer = buffer;
this.offset = offset;
this.count = count;
}
void CompleteWrite(IAsyncResult result)
{
this.parent.BaseStream.EndWrite(result);
this.parent.WriteState.Length = 0;
}
internal static void End(IAsyncResult result)
{
WriteAsyncResult thisPtr = (WriteAsyncResult)result;
thisPtr.InternalWaitForCompletion();
System.Diagnostics.Debug.Assert(thisPtr.written == thisPtr.count);
}
static void OnWrite(IAsyncResult result)
{
if (!result.CompletedSynchronously)
{
WriteAsyncResult thisPtr = (WriteAsyncResult)result.AsyncState;
try
{
thisPtr.CompleteWrite(result);
thisPtr.Write();
}
catch (Exception e)
{
thisPtr.InvokeCallback(e);
}
}
}
internal void Write()
{
for (; ; )
{
this.written += this.parent.EncodeBytes(this.buffer, this.offset + this.written, this.count - this.written);
if (this.written < this.count)
{
IAsyncResult result = this.parent.BaseStream.BeginWrite(this.parent.WriteState.Buffer, 0, this.parent.WriteState.Length, onWrite, this);
if (!result.CompletedSynchronously)
break;
CompleteWrite(result);
}
else
{
InvokeCallback();
break;
}
}
}
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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- MenuEventArgs.cs
- documentsequencetextcontainer.cs
- wmiprovider.cs
- TransactionManagerProxy.cs
- ColumnClickEvent.cs
- SrgsItemList.cs
- InternalResources.cs
- TextDecorationCollectionConverter.cs
- SetUserPreferenceRequest.cs
- CodeAssignStatement.cs
- RequestDescription.cs
- XmlAttributeCollection.cs
- DiscoveryExceptionDictionary.cs
- DataGridBoolColumn.cs
- TextContainerHelper.cs
- _SslSessionsCache.cs
- ImplicitInputBrush.cs
- AppearanceEditorPart.cs
- DefaultSection.cs
- ListViewDeleteEventArgs.cs
- SmiTypedGetterSetter.cs
- SchemaImporterExtensionElementCollection.cs
- ValuePattern.cs
- Timer.cs
- Filter.cs
- TemplatedWizardStep.cs
- ViewgenContext.cs
- FrameworkElementAutomationPeer.cs
- PasswordTextNavigator.cs
- TimeEnumHelper.cs
- WebBrowserPermission.cs
- Int16Animation.cs
- MethodBuilderInstantiation.cs
- EventSourceCreationData.cs
- BaseComponentEditor.cs
- COM2EnumConverter.cs
- UnsignedPublishLicense.cs
- BindableTemplateBuilder.cs
- ThreadPool.cs
- ApplicationGesture.cs
- FontSource.cs
- WebPartConnectVerb.cs
- Repeater.cs
- ObjectViewQueryResultData.cs
- CssTextWriter.cs
- Context.cs
- CharEntityEncoderFallback.cs
- LineInfo.cs
- ListControlBoundActionList.cs
- OpCodes.cs
- FunctionCommandText.cs
- ImageField.cs
- DataStreamFromComStream.cs
- CorrelationResolver.cs
- CreateUserErrorEventArgs.cs
- WsrmTraceRecord.cs
- MergeFilterQuery.cs
- WebRequestModuleElement.cs
- SafeReadContext.cs
- TextRenderer.cs
- ServiceBuildProvider.cs
- ChannelBinding.cs
- SharedConnectionInfo.cs
- RectangleGeometry.cs
- SemaphoreFullException.cs
- XsltFunctions.cs
- DPTypeDescriptorContext.cs
- ProviderBase.cs
- XmlWellformedWriter.cs
- CompilerError.cs
- SchemaType.cs
- AttachedPropertyBrowsableAttribute.cs
- SemaphoreSecurity.cs
- ChineseLunisolarCalendar.cs
- Action.cs
- OdbcConnectionString.cs
- EntityDesignerUtils.cs
- CollectionChangeEventArgs.cs
- DataSourceCacheDurationConverter.cs
- DataServicePagingProviderWrapper.cs
- sqlinternaltransaction.cs
- WindowAutomationPeer.cs
- GPRECT.cs
- TextTreeRootTextBlock.cs
- StylusPointPropertyInfo.cs
- CodeTypeParameterCollection.cs
- AccessViolationException.cs
- Verify.cs
- OleDbErrorCollection.cs
- XamlInt32CollectionSerializer.cs
- TransformerInfo.cs
- TemplateField.cs
- ListViewEditEventArgs.cs
- __FastResourceComparer.cs
- SByte.cs
- GifBitmapDecoder.cs
- BufferedGraphics.cs
- OutputCacheProfileCollection.cs
- ECDiffieHellmanPublicKey.cs
- LogArchiveSnapshot.cs