Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / Base64Encoder.cs / 1 / Base64Encoder.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System.Text; using System.Diagnostics; namespace System.Xml { internal abstract class Base64Encoder { byte[] leftOverBytes; int leftOverBytesCount; char[] charsLine; internal const int Base64LineSize = 76; internal const int LineSizeInBytes = Base64LineSize/4*3; internal Base64Encoder() { charsLine = new char[Base64LineSize]; } internal abstract void WriteChars( char[] chars, int index, int count ); internal void Encode( byte[] buffer, int index, int count ) { if ( buffer == null ) { throw new ArgumentNullException( "buffer" ); } if ( index < 0 ) { throw new ArgumentOutOfRangeException( "index" ); } if ( count < 0 ) { throw new ArgumentOutOfRangeException( "count" ); } if ( count > buffer.Length - index ) { throw new ArgumentOutOfRangeException( "count" ); } // encode left-over buffer if( leftOverBytesCount > 0 ) { int i = leftOverBytesCount; while ( i < 3 && count > 0 ) { leftOverBytes[i++] = buffer[index++]; count--; } // the total number of buffer we have is less than 3 -> return if ( count == 0 && i < 3 ) { leftOverBytesCount = i; return; } // encode the left-over buffer and write out int leftOverChars = Convert.ToBase64CharArray( leftOverBytes, 0, 3, charsLine, 0 ); WriteChars( charsLine, 0, leftOverChars ); } // store new left-over buffer leftOverBytesCount = count % 3; if ( leftOverBytesCount > 0 ) { count -= leftOverBytesCount; if ( leftOverBytes == null ) { leftOverBytes = new byte[3]; } for( int i = 0; i < leftOverBytesCount; i++ ) { leftOverBytes[i] = buffer[ index + count + i ]; } } // encode buffer in 76 character long chunks int endIndex = index + count; int chunkSize = LineSizeInBytes; while( index < endIndex ) { if ( index + chunkSize > endIndex ) { chunkSize = endIndex - index; } int charCount = Convert.ToBase64CharArray( buffer, index, chunkSize, charsLine, 0 ); WriteChars( charsLine, 0, charCount ); index += chunkSize; } } internal void Flush() { if ( leftOverBytesCount > 0 ) { int leftOverChars = Convert.ToBase64CharArray( leftOverBytes, 0, leftOverBytesCount, charsLine, 0 ); WriteChars( charsLine, 0, leftOverChars ); leftOverBytesCount = 0; } } } internal class XmlRawWriterBase64Encoder : Base64Encoder { XmlRawWriter rawWriter; internal XmlRawWriterBase64Encoder( XmlRawWriter rawWriter ) { this.rawWriter = rawWriter; } internal override void WriteChars( char[] chars, int index, int count ) { rawWriter.WriteRaw( chars, index, count ); } } internal class XmlTextWriterBase64Encoder : Base64Encoder { XmlTextEncoder xmlTextEncoder; internal XmlTextWriterBase64Encoder( XmlTextEncoder xmlTextEncoder ) { this.xmlTextEncoder = xmlTextEncoder; } internal override void WriteChars( char[] chars, int index, int count ) { xmlTextEncoder.WriteRaw( chars, index, count ); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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