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//------------------------------------------------------------------------------
// <copyright file="BinHexDecoder.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
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;
}
}
#if SILVERLIGHT && !SILVERLIGHT_DISABLE_SECURITY
[System.Security.SecuritySafeCritical]
#endif
internal override unsafe int Decode(char[] chars, int startPos, int len) {
if ( chars == null ) {
throw new ArgumentNullException( "chars" );
}
if ( len < 0 ) {
throw new ArgumentOutOfRangeException( "len" );
}
if ( startPos < 0 ) {
throw new ArgumentOutOfRangeException( "startPos" );
}
if ( chars.Length - startPos < len ) {
throw new ArgumentOutOfRangeException( "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;
}
#if SILVERLIGHT && !SILVERLIGHT_DISABLE_SECURITY
[System.Security.SecuritySafeCritical]
#endif
internal override unsafe int Decode(string str, int startPos, int len) {
if ( str == null ) {
throw new ArgumentNullException( "str" );
}
if ( len < 0 ) {
throw new ArgumentOutOfRangeException( "len" );
}
if ( startPos < 0 ) {
throw new ArgumentOutOfRangeException( "startPos" );
}
if ( str.Length - startPos < len ) {
throw new ArgumentOutOfRangeException( "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
//
#if SILVERLIGHT && !SILVERLIGHT_DISABLE_SECURITY
[System.Security.SecuritySafeCritical]
#endif
public static unsafe byte[] Decode(char[] chars, bool allowOddChars) {
if ( chars == null ) {
throw new ArgumentNullException( "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 ];
Array.Copy( bytes, 0, tmp, 0, bytesDecoded );
bytes = tmp;
}
return bytes;
}
//
// Private methods
//
#if SILVERLIGHT && !SILVERLIGHT_DISABLE_SECURITY
[System.Security.SecurityCritical]
#endif
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);
}
}
}
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