Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / BinHexDecoder.cs / 1 / BinHexDecoder.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System; using System.Diagnostics; namespace System.Xml { internal class BinHexDecoder : IncrementalReadDecoder { // // Fields // byte[] buffer; int startIndex; int curIndex; int endIndex; bool hasHalfByteCached; byte cachedHalfByte; // // IncrementalReadDecoder interface // internal override int DecodedCount { get { return curIndex - startIndex; } } internal override bool IsFull { get { return curIndex == endIndex; } } internal override unsafe int Decode( char[] chars, int startPos, int len ) { Debug.Assert( chars != null ); Debug.Assert( len >= 0 ); Debug.Assert( startPos >= 0 ); Debug.Assert( chars.Length - startPos >= len ); if ( len == 0 ) { return 0; } int bytesDecoded, charsDecoded; fixed ( char* pChars = &chars[startPos] ) { fixed ( byte* pBytes = &buffer[curIndex] ) { Decode( pChars, pChars + len, pBytes, pBytes + ( endIndex - curIndex ), ref this.hasHalfByteCached, ref this.cachedHalfByte, out charsDecoded, out bytesDecoded ); } } curIndex += bytesDecoded; return charsDecoded; } internal override unsafe int Decode( string str, int startPos, int len ) { Debug.Assert( str != null ); Debug.Assert( len >= 0 ); Debug.Assert( startPos >= 0 ); Debug.Assert( str.Length - startPos >= len ); if ( len == 0 ) { return 0; } int bytesDecoded, charsDecoded; fixed ( char* pChars = str ) { fixed ( byte* pBytes = &buffer[curIndex] ) { Decode( pChars + startPos, pChars + startPos + len, pBytes, pBytes + ( endIndex - curIndex ), ref this.hasHalfByteCached, ref this.cachedHalfByte, out charsDecoded, out bytesDecoded ); } } curIndex += bytesDecoded; return charsDecoded; } internal override void Reset() { this.hasHalfByteCached = false; this.cachedHalfByte = 0; } internal override void SetNextOutputBuffer( Array buffer, int index, int count ) { Debug.Assert( buffer != null ); Debug.Assert( count >= 0 ); Debug.Assert( index >= 0 ); Debug.Assert( buffer.Length - index >= count ); Debug.Assert( ( buffer as byte[] ) != null ); this.buffer = (byte[])buffer; this.startIndex = index; this.curIndex = index; this.endIndex = index + count; } // // Static methods // public static unsafe byte[] Decode( char[] chars, bool allowOddChars ) { if ( chars == null ) { throw new ArgumentException( "chars" ); } int len = chars.Length; if ( len == 0 ) { return new byte[0]; } byte[] bytes = new byte[ ( len + 1 ) / 2 ]; int bytesDecoded, charsDecoded; bool hasHalfByteCached = false; byte cachedHalfByte = 0; fixed ( char* pChars = &chars[0] ) { fixed ( byte* pBytes = &bytes[0] ) { Decode( pChars, pChars + len, pBytes, pBytes + bytes.Length, ref hasHalfByteCached, ref cachedHalfByte, out charsDecoded, out bytesDecoded ); } } if ( hasHalfByteCached && !allowOddChars ) { throw new XmlException( Res.Xml_InvalidBinHexValueOddCount, new string( chars ) ); } if ( bytesDecoded < bytes.Length ) { byte[] tmp = new byte[ bytesDecoded ]; Buffer.BlockCopy( bytes, 0, tmp, 0, bytesDecoded ); bytes = tmp; } return bytes; } // // Private methods // private static unsafe void Decode( char* pChars, char *pCharsEndPos, byte* pBytes, byte* pBytesEndPos, ref bool hasHalfByteCached, ref byte cachedHalfByte, out int charsDecoded, out int bytesDecoded ) { #if DEBUG Debug.Assert( pCharsEndPos - pChars >= 0 ); Debug.Assert( pBytesEndPos - pBytes >= 0 ); #endif char* pChar = pChars; byte* pByte = pBytes; XmlCharType xmlCharType = XmlCharType.Instance; while ( pChar < pCharsEndPos && pByte < pBytesEndPos ) { byte halfByte; char ch = *pChar++; if ( ch >= 'a' && ch <= 'f' ) { halfByte = (byte)(ch - 'a' + 10); } else if ( ch >= 'A' && ch <= 'F' ) { halfByte = (byte)(ch - 'A' + 10); } else if ( ch >= '0' && ch <= '9' ) { halfByte = (byte)(ch - '0'); } else if ( ( xmlCharType.charProperties[ch] & XmlCharType.fWhitespace ) != 0 ) { // else if ( xmlCharType.IsWhiteSpace( ch ) ) { continue; } else { throw new XmlException(Res.Xml_InvalidBinHexValue, new string( pChars, 0, (int)( pCharsEndPos - pChars ) ) ); } if ( hasHalfByteCached ) { *pByte++ = (byte)( ( cachedHalfByte << 4 ) + halfByte ); hasHalfByteCached = false; } else { cachedHalfByte = halfByte; hasHalfByteCached = true; } } bytesDecoded = (int)(pByte - pBytes); charsDecoded = (int)(pChar - pChars); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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