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//------------------------------------------------------------------------------
// <copyright file="Base64Encoder.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">[....]</owner>
//------------------------------------------------------------------------------
using System.Text;
using System.Diagnostics;
namespace System.Xml {
internal abstract partial 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 partial 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 );
}
}
#if !SILVERLIGHT || FEATURE_NETCORE
internal partial 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 );
}
}
#endif
}
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