1094 lines
38 KiB
C#
1094 lines
38 KiB
C#
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//-----------------------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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namespace System.Xml
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{
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using System;
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using System.IO;
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using System.Text;
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using System.Runtime.Serialization;
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// This wrapper does not support seek.
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// Constructors consume/emit byte order mark.
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// Supports: UTF-8, Unicode, BigEndianUnicode
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// ASSUMPTION ([....]): This class will only be used for EITHER reading OR writing. It can be done, it would just mean more buffers.
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// ASSUMPTION ([....]): The byte buffer is large enough to hold the declaration
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// ASSUMPTION ([....]): The buffer manipulation methods (FillBuffer/Compare/etc.) will only be used to parse the declaration
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// during construction.
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class EncodingStreamWrapper : Stream
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{
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enum SupportedEncoding { UTF8, UTF16LE, UTF16BE, None }
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static readonly UTF8Encoding SafeUTF8 = new UTF8Encoding(false, false);
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static readonly UnicodeEncoding SafeUTF16 = new UnicodeEncoding(false, false, false);
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static readonly UnicodeEncoding SafeBEUTF16 = new UnicodeEncoding(true, false, false);
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static readonly UTF8Encoding ValidatingUTF8 = new UTF8Encoding(false, true);
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static readonly UnicodeEncoding ValidatingUTF16 = new UnicodeEncoding(false, false, true);
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static readonly UnicodeEncoding ValidatingBEUTF16 = new UnicodeEncoding(true, false, true);
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const int BufferLength = 128;
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// UTF-8 is fastpath, so that's how these are stored
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// Compare methods adapt to unicodes.
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static readonly byte[] encodingAttr = new byte[] { (byte)'e', (byte)'n', (byte)'c', (byte)'o', (byte)'d', (byte)'i', (byte)'n', (byte)'g' };
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static readonly byte[] encodingUTF8 = new byte[] { (byte)'u', (byte)'t', (byte)'f', (byte)'-', (byte)'8' };
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static readonly byte[] encodingUnicode = new byte[] { (byte)'u', (byte)'t', (byte)'f', (byte)'-', (byte)'1', (byte)'6' };
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static readonly byte[] encodingUnicodeLE = new byte[] { (byte)'u', (byte)'t', (byte)'f', (byte)'-', (byte)'1', (byte)'6', (byte)'l', (byte)'e' };
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static readonly byte[] encodingUnicodeBE = new byte[] { (byte)'u', (byte)'t', (byte)'f', (byte)'-', (byte)'1', (byte)'6', (byte)'b', (byte)'e' };
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SupportedEncoding encodingCode;
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Encoding encoding;
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Encoder enc;
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Decoder dec;
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bool isReading;
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Stream stream;
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char[] chars;
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byte[] bytes;
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int byteOffset;
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int byteCount;
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byte[] byteBuffer = new byte[1];
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// Reading constructor
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public EncodingStreamWrapper(Stream stream, Encoding encoding)
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{
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try
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{
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this.isReading = true;
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this.stream = new BufferedStream(stream);
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// Decode the expected encoding
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SupportedEncoding expectedEnc = GetSupportedEncoding(encoding);
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// Get the byte order mark so we can determine the encoding
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// May want to try to delay allocating everything until we know the BOM
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SupportedEncoding declEnc = ReadBOMEncoding(encoding == null);
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// Check that the expected encoding matches the decl encoding.
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if (expectedEnc != SupportedEncoding.None && expectedEnc != declEnc)
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ThrowExpectedEncodingMismatch(expectedEnc, declEnc);
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// Fastpath: UTF-8 BOM
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if (declEnc == SupportedEncoding.UTF8)
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{
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// Fastpath: UTF-8 BOM, No declaration
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FillBuffer(2);
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if (bytes[byteOffset + 1] != '?' || bytes[byteOffset] != '<')
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{
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return;
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}
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FillBuffer(BufferLength);
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CheckUTF8DeclarationEncoding(bytes, byteOffset, byteCount, declEnc, expectedEnc);
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}
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else
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{
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// Convert to UTF-8
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EnsureBuffers();
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FillBuffer((BufferLength - 1) * 2);
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SetReadDocumentEncoding(declEnc);
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CleanupCharBreak();
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int count = this.encoding.GetChars(bytes, byteOffset, byteCount, chars, 0);
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byteOffset = 0;
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byteCount = ValidatingUTF8.GetBytes(chars, 0, count, bytes, 0);
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// Check for declaration
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if (bytes[1] == '?' && bytes[0] == '<')
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{
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CheckUTF8DeclarationEncoding(bytes, 0, byteCount, declEnc, expectedEnc);
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}
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else
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{
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// Declaration required if no out-of-band encoding
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if (expectedEnc == SupportedEncoding.None)
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlDeclarationRequired)));
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}
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}
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}
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catch (DecoderFallbackException ex)
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlInvalidBytes), ex));
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}
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}
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void SetReadDocumentEncoding(SupportedEncoding e)
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{
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EnsureBuffers();
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this.encodingCode = e;
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this.encoding = GetEncoding(e);
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}
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static Encoding GetEncoding(SupportedEncoding e)
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{
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switch (e)
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{
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case SupportedEncoding.UTF8:
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return ValidatingUTF8;
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case SupportedEncoding.UTF16LE:
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return ValidatingUTF16;
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case SupportedEncoding.UTF16BE:
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return ValidatingBEUTF16;
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default:
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlEncodingNotSupported)));
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}
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}
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static Encoding GetSafeEncoding(SupportedEncoding e)
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{
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switch (e)
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{
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case SupportedEncoding.UTF8:
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return SafeUTF8;
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case SupportedEncoding.UTF16LE:
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return SafeUTF16;
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case SupportedEncoding.UTF16BE:
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return SafeBEUTF16;
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default:
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlEncodingNotSupported)));
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}
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}
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static string GetEncodingName(SupportedEncoding enc)
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{
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switch (enc)
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{
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case SupportedEncoding.UTF8:
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return "utf-8";
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case SupportedEncoding.UTF16LE:
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return "utf-16LE";
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case SupportedEncoding.UTF16BE:
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return "utf-16BE";
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default:
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlEncodingNotSupported)));
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}
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}
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static SupportedEncoding GetSupportedEncoding(Encoding encoding)
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{
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if (encoding == null)
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return SupportedEncoding.None;
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else if (encoding.WebName == ValidatingUTF8.WebName)
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return SupportedEncoding.UTF8;
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else if (encoding.WebName == ValidatingUTF16.WebName)
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return SupportedEncoding.UTF16LE;
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else if (encoding.WebName == ValidatingBEUTF16.WebName)
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return SupportedEncoding.UTF16BE;
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else
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlEncodingNotSupported)));
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}
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// Writing constructor
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public EncodingStreamWrapper(Stream stream, Encoding encoding, bool emitBOM)
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{
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this.isReading = false;
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this.encoding = encoding;
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this.stream = new BufferedStream(stream);
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// Set the encoding code
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this.encodingCode = GetSupportedEncoding(encoding);
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if (encodingCode != SupportedEncoding.UTF8)
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{
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EnsureBuffers();
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dec = ValidatingUTF8.GetDecoder();
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enc = this.encoding.GetEncoder();
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// Emit BOM
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if (emitBOM)
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{
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byte[] bom = this.encoding.GetPreamble();
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if (bom.Length > 0)
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this.stream.Write(bom, 0, bom.Length);
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}
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}
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}
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SupportedEncoding ReadBOMEncoding(bool notOutOfBand)
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{
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int b1 = this.stream.ReadByte();
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int b2 = this.stream.ReadByte();
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int b3 = this.stream.ReadByte();
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int b4 = this.stream.ReadByte();
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// Premature end of stream
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if (b4 == -1)
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.UnexpectedEndOfFile)));
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int preserve;
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SupportedEncoding e = ReadBOMEncoding((byte)b1, (byte)b2, (byte)b3, (byte)b4, notOutOfBand, out preserve);
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EnsureByteBuffer();
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switch (preserve)
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{
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case 1:
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bytes[0] = (byte)b4;
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break;
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case 2:
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bytes[0] = (byte)b3;
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bytes[1] = (byte)b4;
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break;
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case 4:
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bytes[0] = (byte)b1;
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bytes[1] = (byte)b2;
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bytes[2] = (byte)b3;
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bytes[3] = (byte)b4;
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break;
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}
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byteCount = preserve;
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return e;
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}
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static SupportedEncoding ReadBOMEncoding(byte b1, byte b2, byte b3, byte b4, bool notOutOfBand, out int preserve)
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{
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SupportedEncoding e = SupportedEncoding.UTF8; // Default
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preserve = 0;
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if (b1 == '<' && b2 != 0x00) // UTF-8, no BOM
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{
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e = SupportedEncoding.UTF8;
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preserve = 4;
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}
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else if (b1 == 0xFF && b2 == 0xFE) // UTF-16 little endian
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{
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e = SupportedEncoding.UTF16LE;
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preserve = 2;
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}
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else if (b1 == 0xFE && b2 == 0xFF) // UTF-16 big endian
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{
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e = SupportedEncoding.UTF16BE;
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preserve = 2;
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}
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else if (b1 == 0x00 && b2 == '<') // UTF-16 big endian, no BOM
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{
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e = SupportedEncoding.UTF16BE;
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if (notOutOfBand && (b3 != 0x00 || b4 != '?'))
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlDeclMissing)));
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preserve = 4;
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}
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else if (b1 == '<' && b2 == 0x00) // UTF-16 little endian, no BOM
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{
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e = SupportedEncoding.UTF16LE;
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if (notOutOfBand && (b3 != '?' || b4 != 0x00))
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlDeclMissing)));
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preserve = 4;
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}
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else if (b1 == 0xEF && b2 == 0xBB) // UTF8 with BOM
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{
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// Encoding error
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if (notOutOfBand && b3 != 0xBF)
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlBadBOM)));
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preserve = 1;
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}
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else // Assume UTF8
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{
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preserve = 4;
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}
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return e;
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}
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void FillBuffer(int count)
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{
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count -= byteCount;
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while (count > 0)
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{
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int read = stream.Read(bytes, byteOffset + byteCount, count);
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if (read == 0)
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break;
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byteCount += read;
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count -= read;
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}
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}
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void EnsureBuffers()
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{
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EnsureByteBuffer();
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if (chars == null)
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chars = new char[BufferLength];
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}
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void EnsureByteBuffer()
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{
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if (bytes != null)
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return;
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bytes = new byte[BufferLength * 4];
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byteOffset = 0;
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byteCount = 0;
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}
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static void CheckUTF8DeclarationEncoding(byte[] buffer, int offset, int count, SupportedEncoding e, SupportedEncoding expectedEnc)
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{
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byte quot = 0;
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int encEq = -1;
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int max = offset + Math.Min(count, BufferLength);
|
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|
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// Encoding should be second "=", abort at first "?"
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int i = 0;
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int eq = 0;
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for (i = offset + 2; i < max; i++) // Skip the "<?" so we don't get caught by the first "?"
|
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{
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if (quot != 0)
|
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{
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if (buffer[i] == quot)
|
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{
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quot = 0;
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}
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continue;
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}
|
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if (buffer[i] == (byte)'\'' || buffer[i] == (byte)'"')
|
||
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{
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quot = buffer[i];
|
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}
|
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else if (buffer[i] == (byte)'=')
|
||
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{
|
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if (eq == 1)
|
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{
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encEq = i;
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break;
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}
|
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eq++;
|
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}
|
||
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else if (buffer[i] == (byte)'?') // Not legal character in a decl before second "="
|
||
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{
|
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break;
|
||
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}
|
||
|
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}
|
||
|
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|
||
|
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// No encoding found
|
||
|
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if (encEq == -1)
|
||
|
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{
|
||
|
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if (e != SupportedEncoding.UTF8 && expectedEnc == SupportedEncoding.None)
|
||
|
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlDeclarationRequired)));
|
||
|
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return;
|
||
|
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}
|
||
|
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|
||
|
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if (encEq < 28) // Earliest second "=" can appear
|
||
|
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlMalformedDecl)));
|
||
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|
||
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// Back off whitespace
|
||
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for (i = encEq - 1; IsWhitespace(buffer[i]); i--);
|
||
|
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|
||
|
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// Check for encoding attribute
|
||
|
|
if (!Compare(encodingAttr, buffer, i - encodingAttr.Length + 1))
|
||
|
|
{
|
||
|
|
if (e != SupportedEncoding.UTF8 && expectedEnc == SupportedEncoding.None)
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlDeclarationRequired)));
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Move ahead of whitespace
|
||
|
|
for (i = encEq + 1; i < max && IsWhitespace(buffer[i]); i++);
|
||
|
|
|
||
|
|
// Find the quotes
|
||
|
|
if (buffer[i] != '\'' && buffer[i] != '"')
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlMalformedDecl)));
|
||
|
|
quot = buffer[i];
|
||
|
|
|
||
|
|
int q = i;
|
||
|
|
for (i = q + 1; buffer[i] != quot && i < max; ++i);
|
||
|
|
|
||
|
|
if (buffer[i] != quot)
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlMalformedDecl)));
|
||
|
|
|
||
|
|
int encStart = q + 1;
|
||
|
|
int encCount = i - encStart;
|
||
|
|
|
||
|
|
// lookup the encoding
|
||
|
|
SupportedEncoding declEnc = e;
|
||
|
|
if (encCount == encodingUTF8.Length && CompareCaseInsensitive(encodingUTF8, buffer, encStart))
|
||
|
|
{
|
||
|
|
declEnc = SupportedEncoding.UTF8;
|
||
|
|
}
|
||
|
|
else if (encCount == encodingUnicodeLE.Length && CompareCaseInsensitive(encodingUnicodeLE, buffer, encStart))
|
||
|
|
{
|
||
|
|
declEnc = SupportedEncoding.UTF16LE;
|
||
|
|
}
|
||
|
|
else if (encCount == encodingUnicodeBE.Length && CompareCaseInsensitive(encodingUnicodeBE, buffer, encStart))
|
||
|
|
{
|
||
|
|
declEnc = SupportedEncoding.UTF16BE;
|
||
|
|
}
|
||
|
|
else if (encCount == encodingUnicode.Length && CompareCaseInsensitive(encodingUnicode, buffer, encStart))
|
||
|
|
{
|
||
|
|
if (e == SupportedEncoding.UTF8)
|
||
|
|
ThrowEncodingMismatch(SafeUTF8.GetString(buffer, encStart, encCount), SafeUTF8.GetString(encodingUTF8, 0, encodingUTF8.Length));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
ThrowEncodingMismatch(SafeUTF8.GetString(buffer, encStart, encCount), e);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (e != declEnc)
|
||
|
|
ThrowEncodingMismatch(SafeUTF8.GetString(buffer, encStart, encCount), e);
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool CompareCaseInsensitive(byte[] key, byte[] buffer, int offset)
|
||
|
|
{
|
||
|
|
for (int i = 0; i < key.Length; i++)
|
||
|
|
{
|
||
|
|
if (key[i] == buffer[offset + i])
|
||
|
|
continue;
|
||
|
|
|
||
|
|
if (key[i] != Char.ToLower((char)buffer[offset + i], System.Globalization.CultureInfo.InvariantCulture))
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool Compare(byte[] key, byte[] buffer, int offset)
|
||
|
|
{
|
||
|
|
for (int i = 0; i < key.Length; i++)
|
||
|
|
{
|
||
|
|
if (key[i] != buffer[offset + i])
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool IsWhitespace(byte ch)
|
||
|
|
{
|
||
|
|
return ch == (byte)' ' || ch == (byte)'\n' || ch == (byte)'\t' || ch == (byte)'\r';
|
||
|
|
}
|
||
|
|
|
||
|
|
internal static ArraySegment<byte> ProcessBuffer(byte[] buffer, int offset, int count, Encoding encoding)
|
||
|
|
{
|
||
|
|
if (count < 4)
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.UnexpectedEndOfFile)));
|
||
|
|
|
||
|
|
try
|
||
|
|
{
|
||
|
|
int preserve;
|
||
|
|
ArraySegment<byte> seg;
|
||
|
|
|
||
|
|
SupportedEncoding expectedEnc = GetSupportedEncoding(encoding);
|
||
|
|
SupportedEncoding declEnc = ReadBOMEncoding(buffer[offset], buffer[offset + 1], buffer[offset + 2], buffer[offset + 3], encoding == null, out preserve);
|
||
|
|
if (expectedEnc != SupportedEncoding.None && expectedEnc != declEnc)
|
||
|
|
ThrowExpectedEncodingMismatch(expectedEnc, declEnc);
|
||
|
|
|
||
|
|
offset += 4 - preserve;
|
||
|
|
count -= 4 - preserve;
|
||
|
|
|
||
|
|
// Fastpath: UTF-8
|
||
|
|
char[] chars;
|
||
|
|
byte[] bytes;
|
||
|
|
Encoding localEnc;
|
||
|
|
if (declEnc == SupportedEncoding.UTF8)
|
||
|
|
{
|
||
|
|
// Fastpath: No declaration
|
||
|
|
if (buffer[offset + 1] != '?' || buffer[offset] != '<')
|
||
|
|
{
|
||
|
|
seg = new ArraySegment<byte>(buffer, offset, count);
|
||
|
|
return seg;
|
||
|
|
}
|
||
|
|
|
||
|
|
CheckUTF8DeclarationEncoding(buffer, offset, count, declEnc, expectedEnc);
|
||
|
|
seg = new ArraySegment<byte>(buffer, offset, count);
|
||
|
|
return seg;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Convert to UTF-8
|
||
|
|
localEnc = GetSafeEncoding(declEnc);
|
||
|
|
int inputCount = Math.Min(count, BufferLength * 2);
|
||
|
|
chars = new char[localEnc.GetMaxCharCount(inputCount)];
|
||
|
|
int ccount = localEnc.GetChars(buffer, offset, inputCount, chars, 0);
|
||
|
|
bytes = new byte[ValidatingUTF8.GetMaxByteCount(ccount)];
|
||
|
|
int bcount = ValidatingUTF8.GetBytes(chars, 0, ccount, bytes, 0);
|
||
|
|
|
||
|
|
// Check for declaration
|
||
|
|
if (bytes[1] == '?' && bytes[0] == '<')
|
||
|
|
{
|
||
|
|
CheckUTF8DeclarationEncoding(bytes, 0, bcount, declEnc, expectedEnc);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// Declaration required if no out-of-band encoding
|
||
|
|
if (expectedEnc == SupportedEncoding.None)
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlDeclarationRequired)));
|
||
|
|
}
|
||
|
|
|
||
|
|
seg = new ArraySegment<byte>(ValidatingUTF8.GetBytes(GetEncoding(declEnc).GetChars(buffer, offset, count)));
|
||
|
|
return seg;
|
||
|
|
}
|
||
|
|
catch (DecoderFallbackException e)
|
||
|
|
{
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlInvalidBytes), e));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ThrowExpectedEncodingMismatch(SupportedEncoding expEnc, SupportedEncoding actualEnc)
|
||
|
|
{
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlExpectedEncoding, GetEncodingName(expEnc), GetEncodingName(actualEnc))));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ThrowEncodingMismatch(string declEnc, SupportedEncoding enc)
|
||
|
|
{
|
||
|
|
ThrowEncodingMismatch(declEnc, GetEncodingName(enc));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ThrowEncodingMismatch(string declEnc, string docEnc)
|
||
|
|
{
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlEncodingMismatch, declEnc, docEnc)));
|
||
|
|
}
|
||
|
|
|
||
|
|
// This stream wrapper does not support duplex
|
||
|
|
public override bool CanRead
|
||
|
|
{
|
||
|
|
get
|
||
|
|
{
|
||
|
|
if (!isReading)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
return this.stream.CanRead;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// The encoding conversion and buffering breaks seeking.
|
||
|
|
public override bool CanSeek
|
||
|
|
{
|
||
|
|
get
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// This stream wrapper does not support duplex
|
||
|
|
public override bool CanWrite
|
||
|
|
{
|
||
|
|
get
|
||
|
|
{
|
||
|
|
if (isReading)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
return this.stream.CanWrite;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// The encoding conversion and buffering breaks seeking.
|
||
|
|
public override long Position
|
||
|
|
{
|
||
|
|
get
|
||
|
|
{
|
||
|
|
#pragma warning suppress 56503 // The contract for non seekable stream is to throw exception
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException());
|
||
|
|
}
|
||
|
|
set
|
||
|
|
{
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void Close()
|
||
|
|
{
|
||
|
|
Flush();
|
||
|
|
base.Close();
|
||
|
|
this.stream.Close();
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void Flush()
|
||
|
|
{
|
||
|
|
this.stream.Flush();
|
||
|
|
}
|
||
|
|
|
||
|
|
public override int ReadByte()
|
||
|
|
{
|
||
|
|
if (byteCount == 0 && encodingCode == SupportedEncoding.UTF8)
|
||
|
|
return this.stream.ReadByte();
|
||
|
|
if (Read(byteBuffer, 0, 1) == 0)
|
||
|
|
return -1;
|
||
|
|
return byteBuffer[0];
|
||
|
|
}
|
||
|
|
|
||
|
|
public override int Read(byte[] buffer, int offset, int count)
|
||
|
|
{
|
||
|
|
try
|
||
|
|
{
|
||
|
|
if (byteCount == 0)
|
||
|
|
{
|
||
|
|
if (encodingCode == SupportedEncoding.UTF8)
|
||
|
|
return this.stream.Read(buffer, offset, count);
|
||
|
|
|
||
|
|
// No more bytes than can be turned into characters
|
||
|
|
byteOffset = 0;
|
||
|
|
byteCount = this.stream.Read(bytes, byteCount, (chars.Length - 1) * 2);
|
||
|
|
|
||
|
|
// Check for end of stream
|
||
|
|
if (byteCount == 0)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
// Fix up incomplete chars
|
||
|
|
CleanupCharBreak();
|
||
|
|
|
||
|
|
// Change encoding
|
||
|
|
int charCount = this.encoding.GetChars(bytes, 0, byteCount, chars, 0);
|
||
|
|
byteCount = Encoding.UTF8.GetBytes(chars, 0, charCount, bytes, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Give them bytes
|
||
|
|
if (byteCount < count)
|
||
|
|
count = byteCount;
|
||
|
|
Buffer.BlockCopy(bytes, byteOffset, buffer, offset, count);
|
||
|
|
byteOffset += count;
|
||
|
|
byteCount -= count;
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
catch (DecoderFallbackException ex)
|
||
|
|
{
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.XmlInvalidBytes), ex));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void CleanupCharBreak()
|
||
|
|
{
|
||
|
|
int max = byteOffset + byteCount;
|
||
|
|
|
||
|
|
// Read on 2 byte boundaries
|
||
|
|
if ((byteCount % 2) != 0)
|
||
|
|
{
|
||
|
|
int b = this.stream.ReadByte();
|
||
|
|
if (b < 0)
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.UnexpectedEndOfFile)));
|
||
|
|
|
||
|
|
bytes[max++] = (byte)b;
|
||
|
|
byteCount++;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Don't cut off a surrogate character
|
||
|
|
int w;
|
||
|
|
if (encodingCode == SupportedEncoding.UTF16LE)
|
||
|
|
{
|
||
|
|
w = bytes[max - 2] + (bytes[max - 1] << 8);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
w = bytes[max - 1] + (bytes[max - 2] << 8);
|
||
|
|
}
|
||
|
|
if ((w & 0xDC00) != 0xDC00 && w >= 0xD800 && w <= 0xDBFF) // First 16-bit number of surrogate pair
|
||
|
|
{
|
||
|
|
int b1 = this.stream.ReadByte();
|
||
|
|
int b2 = this.stream.ReadByte();
|
||
|
|
if (b2 < 0)
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new XmlException(SR.GetString(SR.UnexpectedEndOfFile)));
|
||
|
|
bytes[max++] = (byte)b1;
|
||
|
|
bytes[max++] = (byte)b2;
|
||
|
|
byteCount += 2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public override long Seek(long offset, SeekOrigin origin)
|
||
|
|
{
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException());
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void WriteByte(byte b)
|
||
|
|
{
|
||
|
|
if (encodingCode == SupportedEncoding.UTF8)
|
||
|
|
{
|
||
|
|
this.stream.WriteByte(b);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
byteBuffer[0] = b;
|
||
|
|
Write(byteBuffer, 0, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void Write(byte[] buffer, int offset, int count)
|
||
|
|
{
|
||
|
|
// Optimize UTF-8 case
|
||
|
|
if (encodingCode == SupportedEncoding.UTF8)
|
||
|
|
{
|
||
|
|
this.stream.Write(buffer, offset, count);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
while (count > 0)
|
||
|
|
{
|
||
|
|
int size = chars.Length < count ? chars.Length : count;
|
||
|
|
int charCount = dec.GetChars(buffer, offset, size, chars, 0, false);
|
||
|
|
byteCount = enc.GetBytes(chars, 0, charCount, bytes, 0, false);
|
||
|
|
this.stream.Write(bytes, 0, byteCount);
|
||
|
|
offset += size;
|
||
|
|
count -= size;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Delegate properties
|
||
|
|
public override bool CanTimeout { get { return this.stream.CanTimeout; } }
|
||
|
|
public override long Length { get { return this.stream.Length; } }
|
||
|
|
public override int ReadTimeout
|
||
|
|
{
|
||
|
|
get { return this.stream.ReadTimeout; }
|
||
|
|
set { this.stream.ReadTimeout = value; }
|
||
|
|
}
|
||
|
|
public override int WriteTimeout
|
||
|
|
{
|
||
|
|
get { return this.stream.WriteTimeout; }
|
||
|
|
set { this.stream.WriteTimeout = value; }
|
||
|
|
}
|
||
|
|
|
||
|
|
// Delegate methods
|
||
|
|
public override void SetLength(long value)
|
||
|
|
{
|
||
|
|
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Add format exceptions
|
||
|
|
// Do we need to modify the stream position/Seek to account for the buffer?
|
||
|
|
// ASSUMPTION ([....]): This class will only be used for EITHER reading OR writing.
|
||
|
|
#if NO
|
||
|
|
class UTF16Stream : Stream
|
||
|
|
{
|
||
|
|
const int BufferLength = 128;
|
||
|
|
|
||
|
|
Stream stream;
|
||
|
|
bool bigEndian;
|
||
|
|
byte[] streamBuffer;
|
||
|
|
int streamOffset;
|
||
|
|
int streamMax;
|
||
|
|
byte[] trailBytes = new byte[4];
|
||
|
|
int trailCount;
|
||
|
|
|
||
|
|
public UTF16Stream(Stream stream, bool bigEndian)
|
||
|
|
{
|
||
|
|
this.stream = stream;
|
||
|
|
this.bigEndian = bigEndian;
|
||
|
|
this.streamBuffer = byte[BufferLength];
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void Close()
|
||
|
|
{
|
||
|
|
Flush();
|
||
|
|
base.Close();
|
||
|
|
this.stream.Close();
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void Flush()
|
||
|
|
{
|
||
|
|
this.stream.Flush();
|
||
|
|
}
|
||
|
|
|
||
|
|
public override int Read(byte[] buffer, int offset, int count)
|
||
|
|
{
|
||
|
|
// Validate args
|
||
|
|
|
||
|
|
// Read what we can if we aren't sure we have enough for a single character
|
||
|
|
if (this.streamMax < 4)
|
||
|
|
this.streamMax += this.stream.Read(this.streamBuffer, streamOffset, streamBuffer.Length - this.streamMax);
|
||
|
|
|
||
|
|
int totalWritten = 0;
|
||
|
|
while (streamOffset < streamMax && count > 0)
|
||
|
|
{
|
||
|
|
int ch;
|
||
|
|
int read;
|
||
|
|
|
||
|
|
read = ReadUTF16Char(out ch, streamBuffer, streamOffset, streamBuffer.Length - streamMax);
|
||
|
|
if (read == 0)
|
||
|
|
break;
|
||
|
|
|
||
|
|
int written = WriteUTF8Char(ch, buffer, offset, count);
|
||
|
|
if (written == 0)
|
||
|
|
break;
|
||
|
|
|
||
|
|
totalWritten += written;
|
||
|
|
streamOffset += read;
|
||
|
|
offset += written;
|
||
|
|
count -= written;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Shift down the leftover data
|
||
|
|
if (this.streamOffset > 0 && this.streamOffset < this.streamMax)
|
||
|
|
{
|
||
|
|
Buffer.BlockCopy(this.streamBuffer, this.streamOffset, this.streamBuffer, 0, this.streamMax - this.streamOffset);
|
||
|
|
this.streamMax -= this.streamOffset;
|
||
|
|
this.streamOffset = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return totalWritten;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ReadUTF8Char(out int ch, byte[] buffer, int offset, int count)
|
||
|
|
{
|
||
|
|
ch = -1;
|
||
|
|
if (buffer[offset] < 0x80)
|
||
|
|
{
|
||
|
|
ch = buffer[offset];
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int mask = buffer[offset] & 0xF0;
|
||
|
|
byte b1, b2, b3, b4;
|
||
|
|
if (mask == 0xC0)
|
||
|
|
{
|
||
|
|
if (count < 2)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
b1 = buffer[offset + 0];
|
||
|
|
b2 = buffer[offset + 1];
|
||
|
|
|
||
|
|
ch = ((b1 & 0x1F) << 6) + (b2 & 0x3F);
|
||
|
|
|
||
|
|
return 2;
|
||
|
|
}
|
||
|
|
else if (mask == 0xE0)
|
||
|
|
{
|
||
|
|
if (count < 3)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
b1 = buffer[offset + 0];
|
||
|
|
b2 = buffer[offset + 1];
|
||
|
|
b3 = buffer[offset + 2];
|
||
|
|
|
||
|
|
ch = ((((b1 & 0x0F) << 6) + (b2 & 0x3F)) << 6) + (b3 & 0x3F);
|
||
|
|
|
||
|
|
return 3;
|
||
|
|
}
|
||
|
|
else if (mask == 0xF0)
|
||
|
|
{
|
||
|
|
if (count < 4)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
b1 = buffer[offset + 0];
|
||
|
|
b2 = buffer[offset + 1];
|
||
|
|
b3 = buffer[offset + 2];
|
||
|
|
b4 = buffer[offset + 3];
|
||
|
|
|
||
|
|
ch = ((((((b1 & 0x0F) << 6) + (b2 & 0x3F)) << 6) + (b3 & 0x3F)) << 6) + (b4 & 0x3F);
|
||
|
|
|
||
|
|
return 4;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Invalid
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ReadUTF16Char(out int ch, byte[] buffer, int offset, int count)
|
||
|
|
{
|
||
|
|
ch = -1;
|
||
|
|
|
||
|
|
if (count < 2)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
int w1 = ReadEndian(buffer, offset);
|
||
|
|
|
||
|
|
if (w1 < 0xD800 || w1 > 0xDFFF)
|
||
|
|
{
|
||
|
|
ch = w1;
|
||
|
|
return 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (count < 4)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
int w2 = ReadEndian(buffer, offset + 2);
|
||
|
|
|
||
|
|
ch = ((w1 & 0x03FF) << 10) + (w2 & 0x03FF);
|
||
|
|
return 4;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ReadEndian(byte[] buffer, int offset)
|
||
|
|
{
|
||
|
|
if (bigEndian)
|
||
|
|
{
|
||
|
|
return (buffer[offset + 0] << 8) + buffer[offset + 1];
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
return (buffer[offset + 1] << 8) + buffer[offset + 0];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int WriteUTF8Char(int ch, byte[] buffer, int offset, int count)
|
||
|
|
{
|
||
|
|
if (ch < 0x80)
|
||
|
|
{
|
||
|
|
buffer[offset] = (byte)ch;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
else if (ch < 0x800)
|
||
|
|
{
|
||
|
|
if (count < 2)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
buffer[offset + 1] = 0x80 | (ch & 0x3F);
|
||
|
|
ch >>= 6;
|
||
|
|
buffer[offset + 0] = 0xC0 | ch;
|
||
|
|
return 2
|
||
|
|
}
|
||
|
|
else if (ch < 0x10000)
|
||
|
|
{
|
||
|
|
if (count < 3)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
buffer[offset + 2] = 0x80 | (ch & 0x3F);
|
||
|
|
ch >>= 6;
|
||
|
|
buffer[offset + 1] = 0x80 | (ch & 0x3F);
|
||
|
|
ch >>= 6;
|
||
|
|
buffer[offset + 0] = 0xE0 | ch;
|
||
|
|
return 3;
|
||
|
|
}
|
||
|
|
else if (ch <= 0x110000)
|
||
|
|
{
|
||
|
|
if (count < 4)
|
||
|
|
return 0;
|
||
|
|
buffer[offset + 3] = 0x80 | (ch & 0x3F);
|
||
|
|
ch >>= 6;
|
||
|
|
buffer[offset + 2] = 0x80 | (ch & 0x3F);
|
||
|
|
ch >>= 6;
|
||
|
|
buffer[offset + 1] = 0x80 | (ch & 0x3F);
|
||
|
|
ch >>= 6;
|
||
|
|
buffer[offset + 0] = 0xF0 | ch;
|
||
|
|
return 4;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Invalid?
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int WriteUTF16Char(int ch, byte[] buffer, int offset, int count)
|
||
|
|
{
|
||
|
|
if (ch < 0x10000)
|
||
|
|
{
|
||
|
|
if (count < 2)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
WriteEndian(ch, buffer, offset);
|
||
|
|
return 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (count < 4)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
ch -= 0x10000;
|
||
|
|
int w2 = 0xDC00 | (ch & 0x03FF);
|
||
|
|
int w1 = 0xD800 | ch >> 10;
|
||
|
|
WriteEndian(w1, buffer, offset);
|
||
|
|
WriteEndian(w2, buffer, offset + 2);
|
||
|
|
return 4;
|
||
|
|
}
|
||
|
|
|
||
|
|
void WriteEndian(int ch, byte[] buffer, int offset)
|
||
|
|
{
|
||
|
|
if (bigEndian)
|
||
|
|
{
|
||
|
|
buffer[offset + 1] = (byte)ch;
|
||
|
|
buffer[offset + 0] = ch >> 8;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
buffer[offset + 0] = (byte)ch;
|
||
|
|
buffer[offset + 1] = ch >> 8;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void Write(byte[] buffer, int offset, int count)
|
||
|
|
{
|
||
|
|
// Validate args
|
||
|
|
|
||
|
|
// Write the trail bytes
|
||
|
|
if (trailCount > 0)
|
||
|
|
{
|
||
|
|
int free = 4-trailCount;
|
||
|
|
int total = (count < free ? count : free) + trialCount;
|
||
|
|
Buffer.BlockCopy(buffer, offset, trailBytes, trailCount, total);
|
||
|
|
|
||
|
|
int c;
|
||
|
|
int r = ReadUTF8Char(out c, trailBuffer, 0, total);
|
||
|
|
if (r == 0 && count < free)
|
||
|
|
{
|
||
|
|
trailCount = total;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
int diff = r - trailCount;
|
||
|
|
offset += diff;
|
||
|
|
count -= diff;
|
||
|
|
streamOffset = WriteUTF16Char(c, streamBuffer, 0, streamBuffer.Length - streamOffset);
|
||
|
|
}
|
||
|
|
|
||
|
|
while (count > 0)
|
||
|
|
{
|
||
|
|
if (streamBuffer.Length - streamOffset < 4)
|
||
|
|
{
|
||
|
|
this.stream.Write(streamBuffer, 0, streamOffset);
|
||
|
|
streamOffset = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ch;
|
||
|
|
int read = ReadUTF8Char(out ch, buffer, offset, count);
|
||
|
|
if (read == 0)
|
||
|
|
break;
|
||
|
|
|
||
|
|
int written = WriteUTF16Char(ch, streamBuffer, streamOffset, streamBuffer.Length - streamOffset);
|
||
|
|
if (written == 0)
|
||
|
|
break;
|
||
|
|
|
||
|
|
streamOffset += written;
|
||
|
|
offset += read;
|
||
|
|
count -= read;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (streamOffset > 0)
|
||
|
|
{
|
||
|
|
this.stream.Write(streamBuffer, 0, streamOffset);
|
||
|
|
streamOffset = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Save trailing bytes
|
||
|
|
if (count > 0)
|
||
|
|
{
|
||
|
|
Buffer.BlockCopy(buffer, offset, trailBytes, 0, count);
|
||
|
|
trailCount = count;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Delegate properties
|
||
|
|
public override bool CanRead { get { return this.stream.CanRead; } }
|
||
|
|
public override bool CanSeek { get { return this.stream.CanSeek; } }
|
||
|
|
public override bool CanTimeout { get { return this.stream.CanTimeout; } }
|
||
|
|
public override bool CanWrite { get { return this.stream.CanWrite; } }
|
||
|
|
public override long Length { get { return this.stream.Length; } }
|
||
|
|
public override long Position
|
||
|
|
{
|
||
|
|
get { return this.stream.Position; }
|
||
|
|
set { this.stream.Position = value; }
|
||
|
|
}
|
||
|
|
public override int ReadTimeout
|
||
|
|
{
|
||
|
|
get { return this.stream.ReadTimeout; }
|
||
|
|
set { this.stream.ReadTimeout = value; }
|
||
|
|
}
|
||
|
|
public override int WriteTimeout
|
||
|
|
{
|
||
|
|
get { return this.stream.WriteTimeout; }
|
||
|
|
set { this.stream.WriteTimeout = value; }
|
||
|
|
}
|
||
|
|
|
||
|
|
// Delegate methods
|
||
|
|
public override long Seek(long offset, SeekOrigin origin)
|
||
|
|
{
|
||
|
|
return this.stream.Seek(offset, origin);
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void SetLength(long value)
|
||
|
|
{
|
||
|
|
this.stream.SetLength(value);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
}
|