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//------------------------------------------------------------------------------
// <copyright file="BinHexEncoder.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">[....]</owner>
//------------------------------------------------------------------------------
namespace System.Xml {
internal static partial class BinHexEncoder {
private const string s_hexDigits = "0123456789ABCDEF";
private const int CharsChunkSize = 128;
internal static void Encode( byte[] buffer, int index, int count, XmlWriter writer ) {
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" );
}
char[] chars = new char[ ( count * 2 ) < CharsChunkSize ? ( count * 2 ) : CharsChunkSize ];
int endIndex = index + count;
while ( index < endIndex ) {
int cnt = ( count < CharsChunkSize/2 ) ? count : CharsChunkSize/2;
int charCount = Encode( buffer, index, cnt, chars );
writer.WriteRaw( chars, 0, charCount );
index += cnt;
count -= cnt;
}
}
internal static string Encode(byte[] inArray, int offsetIn, int count) {
if (null == inArray) {
throw new ArgumentNullException("inArray");
}
if (0 > offsetIn) {
throw new ArgumentOutOfRangeException("offsetIn");
}
if (0 > count) {
throw new ArgumentOutOfRangeException("count");
}
if (count > inArray.Length - offsetIn) {
throw new ArgumentOutOfRangeException("count");
}
char[] outArray = new char[2 * count];
int lenOut = Encode(inArray, offsetIn, count, outArray);
return new String(outArray, 0, lenOut);
}
private static int Encode(byte[] inArray, int offsetIn, int count, char[] outArray) {
int curOffsetOut =0, offsetOut = 0;
byte b;
int lengthOut = outArray.Length;
for (int j=0; j<count; j++) {
b = inArray[offsetIn ++];
outArray[curOffsetOut ++] = s_hexDigits[b >> 4];
if (curOffsetOut == lengthOut) {
break;
}
outArray[curOffsetOut ++] = s_hexDigits[b & 0xF];
if (curOffsetOut == lengthOut) {
break;
}
}
return curOffsetOut - offsetOut;
} // function
} // class
} // namespace
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