Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Mail / QuotedPrintableStream.cs / 1 / QuotedPrintableStream.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.Mime { using System; using System.IO; ////// 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 QuotedPrintableStream : DelegatedStream { bool encodeCRLF; static int DefaultLineLength = 76; 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 }; 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; WriteStateInfo writeState; ////// ctor. /// /// Underlying stream /// Preferred maximum line-length for writes internal QuotedPrintableStream(Stream stream, int lineLength) : base(stream) { if (lineLength < 0) throw new ArgumentOutOfRangeException("lineLength"); this.lineLength = lineLength; } /* // Consider removing. ////// ctor. /// /// Underlying stream internal QuotedPrintableStream(Stream stream) : this(stream, DefaultLineLength) { } */ internal QuotedPrintableStream(Stream stream,bool encodeCRLF) : this(stream, DefaultLineLength) { this.encodeCRLF = encodeCRLF; } internal QuotedPrintableStream() { this.lineLength = DefaultLineLength; } internal QuotedPrintableStream(int lineLength) { this.lineLength = lineLength; } ReadStateInfo ReadState { get { if (this.readState == null) this.readState = new ReadStateInfo(); return this.readState; } } internal WriteStateInfo WriteState { get { if (this.writeState == null) this.writeState = new WriteStateInfo(1024); return this.writeState; } } /* public override IAsyncResult BeginRead(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"); ReadAsyncResult result = new ReadAsyncResult(this, buffer, offset, count, callback, state); result.Read(); return result; } */ 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(); } internal 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 != '=') { *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; } internal int EncodeBytes(byte[] buffer, int offset, int count) { int cur = offset; for (; cur < count + offset; cur++) { //only fold if we're before a whitespace if (lineLength != -1 && WriteState.CurrentLineLength + 5 >= this.lineLength && (buffer[cur] == ' ' || buffer[cur] == '\t' || buffer[cur] == '\r' || buffer[cur] == '\n')) { if (WriteState.Buffer.Length - WriteState.Length < 3) return cur - offset; WriteState.CurrentLineLength = 0; WriteState.Buffer[WriteState.Length++] = (byte)'='; WriteState.Buffer[WriteState.Length++] = (byte)'\r'; WriteState.Buffer[WriteState.Length++] = (byte)'\n'; } //need to dot stuff - rfc 2821 4.5.2 Transparency if(WriteState.CurrentLineLength == 0 && buffer[cur] == '.'){ WriteState.Buffer[WriteState.Length++] = (byte)'.'; } if (buffer[cur] == '\r' && cur + 1 < count + offset && buffer[cur+1] == '\n') { if (WriteState.Buffer.Length - WriteState.Length < (encodeCRLF ? 6 : 2)) return cur - offset; cur++; if(encodeCRLF){ 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 += 6; } else{ WriteState.Buffer[WriteState.Length++] = (byte)'\r'; WriteState.Buffer[WriteState.Length++] = (byte)'\n'; WriteState.CurrentLineLength = 0; } } else if ((buffer[cur] < 32 && buffer[cur] != '\t') || buffer[cur] == '=' || buffer[cur] > 126) { if (WriteState.Buffer.Length - WriteState.Length < 3) return cur - offset; WriteState.CurrentLineLength += 3; WriteState.Buffer[WriteState.Length++] = (byte)'='; WriteState.Buffer[WriteState.Length++] = hexEncodeMap[buffer[cur] >> 4]; WriteState.Buffer[WriteState.Length++] = hexEncodeMap[buffer[cur] & 0xF]; } else { if (WriteState.Buffer.Length - WriteState.Length < 1) return cur - offset; WriteState.CurrentLineLength++; WriteState.Buffer[WriteState.Length++] = buffer[cur]; } } return cur - offset; } /* public override int EndRead(IAsyncResult asyncResult) { int read = ReadAsyncResult.End(asyncResult); return read; } */ 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; } } ////// Reads data from the underlying stream into the supplied /// buffer and does decoding in-place. /// /// Buffer to read into /// Offset within buffer to start writing /// Maximum count of bytes to read ///Number of decoded bytes read, 0 if EOS /* public override int Read(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"); for (;;) { // read data from the underlying stream int read = base.Read(buffer, offset, count); // if the underlying stream returns 0 then there // is no more data - ust return 0. if (read == 0) { return 0; } // while decoding, we may end up not having // any bytes to return pending additional data // from the underlying stream. read = DecodeBytes(buffer, offset, read); if (read > 0) { return read; } } } */ 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 ReadAsyncResult : LazyAsyncResult { QuotedPrintableStream parent; byte[] buffer; int offset; int count; int read; static AsyncCallback onRead = new AsyncCallback(OnRead); internal ReadAsyncResult(QuotedPrintableStream 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; } bool CompleteRead(IAsyncResult result) { this.read = this.parent.BaseStream.EndRead(result); // if the underlying stream returns 0 then there // is no more data - ust return 0. if (read == 0) { InvokeCallback(); return true; } // while decoding, we may end up not having // any bytes to return pending additional data // from the underlying stream. this.read = this.parent.DecodeBytes(this.buffer, this.offset, this.read); if (this.read > 0) { InvokeCallback(); return true; } return false; } static void OnRead(IAsyncResult result) { if (!result.CompletedSynchronously) { ReadAsyncResult thisPtr = (ReadAsyncResult)result.AsyncState; try { if (!thisPtr.CompleteRead(result)) thisPtr.Read(); } catch (Exception e) { thisPtr.InvokeCallback(e); } catch { thisPtr.InvokeCallback(new Exception(SR.GetString(SR.net_nonClsCompliantException))); } } } internal void Read() { for (;;) { IAsyncResult result = this.parent.BaseStream.BeginRead(this.buffer, this.offset, this.count, onRead, this); if (!result.CompletedSynchronously || CompleteRead(result)) break; } } internal static int End(IAsyncResult result) { ReadAsyncResult thisPtr = (ReadAsyncResult)result; thisPtr.InternalWaitForCompletion(); return thisPtr.read; } } */ 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; } } } internal class WriteStateInfo { int currentLineLength = 0; byte[] buffer; int length; internal WriteStateInfo(int bufferSize) { this.buffer = new byte[bufferSize]; } internal byte[] Buffer { get { return this.buffer; } } internal int CurrentLineLength { get { return this.currentLineLength; } set { this.currentLineLength = value; } } internal int Length { get { return this.length; } set { this.length = value; } } } class WriteAsyncResult : LazyAsyncResult { QuotedPrintableStream parent; byte[] buffer; int offset; int count; static AsyncCallback onWrite = new AsyncCallback(OnWrite); int written; internal WriteAsyncResult(QuotedPrintableStream 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); } catch { thisPtr.InvokeCallback(new Exception(SR.GetString(SR.net_nonClsCompliantException))); } } } 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; } } } } } }
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