XmlEncoding.cs source code in C# .NET

                        
Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XmlEncoding.cs / 1 / XmlEncoding.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
using System.Text; 
using System.Diagnostics;
 
namespace System.Xml {

    internal class UTF16Decoder : System.Text.Decoder {
        private bool bigEndian; 
        private int lastByte;
        private const int CharSize = 2; 
 
        public UTF16Decoder( bool bigEndian ) {
            this.lastByte = -1; 
            this.bigEndian = bigEndian;
        }

        public override int GetCharCount( byte[] bytes, int index, int count ) { 
            return GetCharCount( bytes, index, count, false );
        } 
 
        public override int GetCharCount( byte[] bytes, int index, int count, bool flush ) {
            int byteCount = count + ( ( lastByte >= 0 ) ? 1 : 0 ); 
            if ( flush && ( byteCount % CharSize != 0 ) ) {
                throw new ArgumentException( Res.GetString( Res.Enc_InvalidByteInEncoding, new object[1] { -1 } ), (string)null );
            }
            return byteCount / CharSize; 
        }
 
        public override int GetChars( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex ) { 
            int charCount = GetCharCount( bytes, byteIndex, byteCount );
 
            if ( lastByte >= 0 ) {
                if ( byteCount == 0 ) {
                    return charCount;
                } 
                int nextByte = bytes[byteIndex++];
                byteCount--; 
 
                chars[charIndex++] = bigEndian
                    ? (char)( lastByte << 8 | nextByte ) 
                    : (char)( nextByte << 8 | lastByte );
                lastByte = -1;
            }
 
            if ( ( byteCount & 1 ) != 0 ) {
                lastByte = bytes[byteIndex + --byteCount]; 
            } 

            // use the fast BlockCopy if possible 
            if ( bigEndian == BitConverter.IsLittleEndian ) {
                int byteEnd = byteIndex + byteCount;
                if ( bigEndian ) {
                    while ( byteIndex < byteEnd ) { 
                        int hi = bytes[byteIndex++];
                        int lo = bytes[byteIndex++]; 
                        chars[charIndex++] = (char)( hi << 8 | lo ); 
                    }
                } 
                else {
                    while ( byteIndex < byteEnd ) {
                        int lo = bytes[byteIndex++];
                        int hi = bytes[byteIndex++]; 
                        chars[charIndex++] = (char)( hi << 8 | lo );
                    } 
                } 
            }
            else { 
                Buffer.BlockCopy( bytes, byteIndex, chars, charIndex * CharSize, byteCount );
            }
            return charCount;
        } 

        public override void Convert( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex, int charCount, bool flush, out int bytesUsed, out int charsUsed, out bool completed ) { 
            charsUsed = 0; 
            bytesUsed = 0;
 
            if ( lastByte >= 0 ) {
                if ( byteCount == 0 ) {
                    completed = true;
                    return; 
                }
                int nextByte = bytes[byteIndex++]; 
                byteCount--; 
                bytesUsed++;
 
                chars[charIndex++] = bigEndian
                    ? (char)( lastByte << 8 | nextByte )
                    : (char)( nextByte << 8 | lastByte );
                charCount--; 
                charsUsed++;
                lastByte = -1; 
            } 

            if ( charCount * CharSize < byteCount ) { 
                byteCount = charCount * CharSize;
                completed = false;
            }
            else { 
                completed = true;
            } 
 
            if ( bigEndian == BitConverter.IsLittleEndian ) {
                int i = byteIndex; 
                int byteEnd = i + ( byteCount & ~0x1 );
                if ( bigEndian ) {
                    while ( i < byteEnd ) {
                        int hi = bytes[i++]; 
                        int lo = bytes[i++];
                        chars[charIndex++] = (char)( hi << 8 | lo ); 
                    } 
                }
                else { 
                    while ( i < byteEnd ) {
                        int lo = bytes[i++];
                        int hi = bytes[i++];
                        chars[charIndex++] = (char)( hi << 8 | lo ); 
                    }
                } 
            } 
            else {
                Buffer.BlockCopy( bytes, byteIndex, chars, charIndex * CharSize, (int)(byteCount & ~0x1) ); 
            }
            charsUsed += byteCount / CharSize;
            bytesUsed += byteCount;
 
            if ( ( byteCount & 1 ) != 0 ) {
                lastByte = bytes[byteIndex + byteCount - 1]; 
            } 
        }
    } 

    internal class SafeAsciiDecoder : Decoder {

        public SafeAsciiDecoder() { 
        }
 
        public override int GetCharCount( byte[] bytes, int index, int count ) { 
            return count;
        } 

        public override int GetChars( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex ) {
            int i = byteIndex;
            int j = charIndex; 
            while ( i < byteIndex + byteCount ) {
                chars[j++] = (char)bytes[i++]; 
            } 
            return byteCount;
        } 

        public override void Convert( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex, int charCount, bool flush, out int bytesUsed, out int charsUsed, out bool completed ) {
            if ( charCount < byteCount ) {
                byteCount = charCount; 
                completed = false;
            } 
            else { 
                completed = true;
            } 

            int i = byteIndex;
            int j = charIndex;
            int byteEndIndex = byteIndex + byteCount; 

            while ( i < byteEndIndex ) { 
                chars[j++] = (char)bytes[i++]; 
            }
 
            charsUsed = byteCount;
            bytesUsed = byteCount;
        }
    } 

    internal class Ucs4Encoding : Encoding  { 
        internal Ucs4Decoder ucs4Decoder; 

        public override Decoder GetDecoder() { 
            return ucs4Decoder;
        }

        public override int GetByteCount( char[] chars, int index, int count ) { 
            return checked( count * 4 );
        } 
 
        public override int GetByteCount( char[] chars ) {
            return chars.Length * 4; 
        }

        public override byte[] GetBytes( string s ) {
            return null; //ucs4Decoder.GetByteCount(chars, index, count); 
        }
        public override int GetBytes( char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex ) { 
            return 0; 
        }
        public override int GetMaxByteCount( int charCount ) { 
            return 0;
        }

        public override int GetCharCount( byte[] bytes, int index, int count ) { 
            return ucs4Decoder.GetCharCount( bytes, index, count );
        } 
 
        public override int GetChars( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex ) {
            return ucs4Decoder.GetChars( bytes, byteIndex, byteCount, chars, charIndex ); 
        }

        public override int GetMaxCharCount( int byteCount ) {
            return ( byteCount + 3 ) / 4; 
        }
 
        public override int CodePage { 
            get {
                return 0; 
            }
        }

        public override int GetCharCount( byte[] bytes ) { 
            return bytes.Length / 4;
        } 
 
        public override Encoder GetEncoder() {
            return null; 
        }

        internal static Encoding UCS4_Littleendian {
            get { 
                return new Ucs4Encoding4321();
            } 
        } 

        internal static Encoding UCS4_Bigendian { 
            get {
                return new Ucs4Encoding1234();
            }
        } 

        internal static Encoding UCS4_2143 { 
            get { 
                return new Ucs4Encoding2143();
            } 
        }
        internal static Encoding UCS4_3412 {
            get {
                return  new Ucs4Encoding3412(); 
            }
        } 
    } 

    internal class Ucs4Encoding1234 : Ucs4Encoding { 

        public Ucs4Encoding1234() {
            ucs4Decoder = new Ucs4Decoder1234();
        } 

        public override string EncodingName { 
            get { 
                return "ucs-4 (Bigendian)";
            } 
        }

        public override byte[] GetPreamble() {
            return new byte[4] { 0x00, 0x00, 0xfe, 0xff }; 
        }
    } 
 
    internal class Ucs4Encoding4321 : Ucs4Encoding {
        public Ucs4Encoding4321() { 
            ucs4Decoder = new Ucs4Decoder4321();
        }

        public override string EncodingName { 
            get {
                return "ucs-4"; 
            } 
        }
 
        public override byte[] GetPreamble() {
            return new byte[4] { 0xff, 0xfe, 0x00, 0x00 };
        }
    } 

    internal class Ucs4Encoding2143 : Ucs4Encoding { 
        public Ucs4Encoding2143() { 
            ucs4Decoder = new Ucs4Decoder2143();
        } 

        public override string EncodingName {
            get {
                return "ucs-4 (order 2143)"; 
            }
        } 
        public override byte[] GetPreamble() { 
            return new byte[4] { 0x00, 0x00, 0xff, 0xfe };
        } 
    }

    internal class Ucs4Encoding3412 : Ucs4Encoding {
        public Ucs4Encoding3412() { 
            ucs4Decoder = new Ucs4Decoder3412();
        } 
 
        public override string EncodingName {
            get { 
                return "ucs-4 (order 3412)";
            }
        }
 
        public override byte[] GetPreamble() {
            return new byte[4] { 0xfe, 0xff, 0x00, 0x00 }; 
        } 
    }
 
    internal abstract class Ucs4Decoder : Decoder {

        internal byte [] lastBytes = new byte[4];
        internal int lastBytesCount = 0; 

        public override int GetCharCount( byte[] bytes, int index, int count ) { 
            return ( count + lastBytesCount ) / 4; 
        }
 
        internal abstract int GetFullChars( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex );

        public override int GetChars( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex ) {
            // finish a character from the bytes that were cached last time 
            int i = lastBytesCount;
            if ( lastBytesCount > 0 ) { 
                // copy remaining bytes into the cache 
                for ( ; lastBytesCount < 4 && byteCount > 0; lastBytesCount++ ) {
                    lastBytes[lastBytesCount] = bytes[byteIndex]; 
                    byteIndex++;
                    byteCount--;
                }
                // still not enough bytes -> return 
                if ( lastBytesCount < 4 ) {
                    return 0; 
                } 
                // decode 1 character from the byte cache
                i = GetFullChars( lastBytes, 0 , 4, chars, charIndex ); 
                Debug.Assert( i == 1 );
                charIndex += i;
                lastBytesCount = 0;
            } 
            else {
                i = 0; 
            } 

            // decode block of byte quadruplets 
            i = GetFullChars( bytes, byteIndex, byteCount, chars, charIndex ) + i;

            // cache remaining bytes that does not make up a character
            int bytesLeft = ( byteCount & 0x3 ); 
            if ( bytesLeft >= 0 ) {
                for( int j = 0; j < bytesLeft; j++ ) { 
                    lastBytes[j] = bytes[byteIndex + byteCount - bytesLeft + j]; 
                }
                lastBytesCount = bytesLeft; 
            }
            return i;
        }
 
        public override void Convert( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex, int charCount, bool flush, out int bytesUsed, out int charsUsed, out bool completed ) {
            bytesUsed = 0; 
            charsUsed = 0; 
            // finish a character from the bytes that were cached last time
            int i = 0; 
            int lbc = lastBytesCount;
            if ( lbc > 0 ) {
                // copy remaining bytes into the cache
                for ( ; lbc < 4 && byteCount > 0; lbc++ ) { 
                    lastBytes[lbc] = bytes[byteIndex];
                    byteIndex++; 
                    byteCount--; 
                    bytesUsed++;
                } 
                // still not enough bytes -> return
                if ( lbc < 4 ) {
                    lastBytesCount = lbc;
                    completed = true; 
                    return;
                } 
                // decode 1 character from the byte cache 
                i = GetFullChars( lastBytes, 0 , 4, chars, charIndex );
                Debug.Assert( i == 1 ); 
                charIndex += i;
                charCount -= i;
                charsUsed = i;
 
                lastBytesCount = 0;
 
                // if that's all that was requested -> return 
                if ( charCount == 0 ) {
                    completed = ( byteCount == 0 ); 
                    return;
                }
            }
            else { 
                i = 0;
            } 
 
            // modify the byte count for GetFullChars depending on how many characters were requested
            if ( charCount * 4 < byteCount ) { 
                byteCount = charCount * 4;
                completed = false;
            }
            else { 
                completed = true;
            } 
            bytesUsed += byteCount; 

            // decode block of byte quadruplets 
            charsUsed = GetFullChars( bytes, byteIndex, byteCount, chars, charIndex ) + i;

            // cache remaining bytes that does not make up a character
            int bytesLeft = ( byteCount & 0x3 ); 
            if ( bytesLeft >= 0 ) {
                for( int j = 0; j < bytesLeft; j++ ) { 
                    lastBytes[j] = bytes[byteIndex + byteCount - bytesLeft + j]; 
                }
                lastBytesCount = bytesLeft; 
            }
        }

        internal char UnicodeToUTF16( uint code) { 
            byte lowerByte, higherByte;
            lowerByte = (byte)( 0xD7C0 + ( code >> 10 ) ); 
            higherByte = (byte)( 0xDC00 | code & 0x3ff ); 
            return ( (char)( ( higherByte << 8 ) | lowerByte ) );
        } 
    }

    internal class Ucs4Decoder4321 : Ucs4Decoder  {
 
        internal override int GetFullChars( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex ) {
            uint code; 
            int i, j; 

            byteCount += byteIndex; 

            for ( i = byteIndex, j = charIndex; i + 3 < byteCount; ) {
                code =  (uint)( ( bytes[i+3] << 24 ) | ( bytes[i+2] << 16 ) | ( bytes[i+1] << 8 ) | bytes[i] );
                if ( code > 0x10FFFF ) { 
                    throw new ArgumentException( Res.GetString( Res.Enc_InvalidByteInEncoding, new object[1] { i } ), (string)null );
                } 
                else if ( code > 0xFFFF ) { 
                    chars[j] = UnicodeToUTF16( code );
                    j++; 
                }
                else {
                    if ( code >= 0xD800 && code <= 0xDFFF ) {
                        throw new XmlException( Res.Xml_InvalidCharInThisEncoding, string.Empty ); 
                    }
                    else { 
                        chars[j] = (char)code; 
                    }
                } 
                j++;
                i += 4;
            }
            return j - charIndex; 
        }
    }; 
 
    internal class Ucs4Decoder1234 : Ucs4Decoder  {
 
        internal override int GetFullChars( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex ) {
            uint code;
            int i,j;
 
            byteCount += byteIndex;
 
            for ( i = byteIndex, j = charIndex; i+3 < byteCount; ) { 
                code = (uint)( ( bytes[i] << 24 ) | ( bytes[i+1] << 16 ) | ( bytes[i+2] << 8 ) | bytes[i+3] );
                if ( code > 0x10FFFF ) { 
                    throw new ArgumentException( Res.GetString( Res.Enc_InvalidByteInEncoding, new object[1] { i } ), (string)null );
                }
                else if ( code > 0xFFFF ) {
                    chars[j] = UnicodeToUTF16( code ); 
                    j++;
                } 
                else { 
                    if ( code >= 0xD800 && code <= 0xDFFF ) {
                        throw new XmlException( Res.Xml_InvalidCharInThisEncoding, string.Empty ); 
                    }
                    else {
                        chars[j] = (char)code;
                    } 
                }
                j++; 
                i += 4; 
            }
            return j - charIndex; 
        }
    }

 
    internal class Ucs4Decoder2143 : Ucs4Decoder  {
 
        internal override int GetFullChars( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex ) { 
            uint code;
            int i,j; 

            byteCount += byteIndex;

            for ( i = byteIndex, j = charIndex; i+3 < byteCount; ) { 
                code = (uint)( ( bytes[i+1] << 24 ) | ( bytes[i] << 16 ) | ( bytes[i+3] << 8 ) | bytes[i+2] );
                if ( code > 0x10FFFF ) { 
                    throw new ArgumentException( Res.GetString( Res.Enc_InvalidByteInEncoding, new object[1] { i } ), (string)null ); 
                }
                else if ( code > 0xFFFF ) { 
                    chars[j] = UnicodeToUTF16( code );
                    j++;
                }
                else { 
                    if ( code >= 0xD800 && code <= 0xDFFF ) {
                        throw new XmlException( Res.Xml_InvalidCharInThisEncoding, string.Empty ); 
                    } 
                    else {
                        chars[j] = (char)code; 
                    }
                }
                j++;
                i += 4; 
            }
            return j - charIndex; 
        } 
    }
 

    internal class Ucs4Decoder3412 : Ucs4Decoder  {

        internal override int GetFullChars( byte[] bytes, int byteIndex, int byteCount, char[] chars, int charIndex ) { 
            uint code;
            int i,j; 
 
            byteCount += byteIndex;
 
            for ( i = byteIndex, j = charIndex; i+3 < byteCount; ) {
                code = (uint)( ( bytes[i+2] << 24 ) | ( bytes[i+3] << 16 ) | ( bytes[i] << 8 ) | bytes[i+1] );
                if ( code > 0x10FFFF ) {
                    throw new ArgumentException( Res.GetString( Res.Enc_InvalidByteInEncoding, new object[1] { i } ), (string)null ); 
                }
                else if ( code > 0xFFFF ) { 
                    chars[j] = UnicodeToUTF16( code ); 
                    j++;
                } 
                else {
                    if ( code >= 0xD800 && code <= 0xDFFF ) {
                        throw new XmlException( Res.Xml_InvalidCharInThisEncoding, string.Empty );
                    } 
                    else {
                        chars[j] = (char)code; 
                    } 
                }
                j++; 
                i += 4;
            }
            return j - charIndex;
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.


                        

                        

                        
                        

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