Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XmlComplianceUtil.cs / 1 / XmlComplianceUtil.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System; using System.IO; namespace System.Xml { using System.Text; internal static class XmlComplianceUtil { // Replaces \r\n, \n, \r and \t with single space (0x20) and then removes spaces // at the beggining and and the end of the string and replaces sequences of spaces // with a single space. public static string NonCDataNormalize( string value ) { int len = value.Length; if ( len <= 0 ) { return string.Empty; } int startPos = 0; StringBuilder norValue = null; XmlCharType xmlCharType = XmlCharType.Instance; while ( xmlCharType.IsWhiteSpace( value[startPos] ) ) { startPos++; if ( startPos == len ) { return " "; } } int i = startPos; while ( i < len ) { if ( !xmlCharType.IsWhiteSpace( value[i] ) ) { i++; continue; } int j = i + 1; while ( j < len && xmlCharType.IsWhiteSpace( value[j] ) ) { j++; } if ( j == len ) { if ( norValue == null ) { return value.Substring( startPos, i - startPos ); } else { norValue.Append( value, startPos, i - startPos ); return norValue.ToString(); } } if (j > i + 1 || value[i] != 0x20 ) { if ( norValue == null ) { norValue = new StringBuilder( len ); } norValue.Append( value, startPos, i - startPos ); norValue.Append( (char)0x20 ); startPos = j; i = j; } else { i++; } } if ( norValue != null ) { if ( startPos < i ) { norValue.Append( value, startPos, i - startPos ); } return norValue.ToString(); } else { if ( startPos > 0 ) { return value.Substring( startPos, len - startPos ); } else { return value; } } } // Replaces \r\n, \n, \r and \t with single space (0x20) public static string CDataNormalize( string value ) { int len = value.Length; if ( len <= 0 ) { return string.Empty; } int i = 0; int startPos = 0; StringBuilder norValue = null; while ( i < len ) { char ch = value[i]; if ( ch >= 0x20 || ( ch != 0x9 && ch != 0xA && ch != 0xD ) ) { i++; continue; } if ( norValue == null ) { norValue = new StringBuilder( len ); } if ( startPos < i ) { norValue.Append( value, startPos, i - startPos ); } norValue.Append( (char)0x20 ); if ( ch == 0xD && ( i+1 < len && value[i+1] == 0xA ) ) { i += 2; } else { i++; } startPos = i; } if ( norValue == null ) { return value; } else { if ( i > startPos ) { norValue.Append(value, startPos, i-startPos); } return norValue.ToString(); } } // StripSpaces removes spaces at the beginning and at the end of the value and replaces sequences of spaces with a single space public static string StripSpaces( string value ) { int len = value.Length; if ( len <= 0 ) { return string.Empty; } int startPos = 0; StringBuilder norValue = null; while ( value[startPos] == 0x20 ) { startPos++; if ( startPos == len ) { return " "; } } int i; for ( i = startPos; i < len; i++ ) { if ( value[i] == 0x20 ) { int j = i + 1; while ( j < len && value[j] == 0x20 ) { j++; } if ( j == len ) { if ( norValue == null ) { return value.Substring( startPos, i - startPos ); } else { norValue.Append( value, startPos, i - startPos ); return norValue.ToString(); } } if ( j > i + 1 ) { if ( norValue == null ) { norValue = new StringBuilder( len ); } norValue.Append( value, startPos, i - startPos + 1 ); startPos = j; i = j - 1; } } } if ( norValue == null ) { return ( startPos == 0 ) ? value : value.Substring( startPos, len - startPos ); } else { if ( i > startPos ) { norValue.Append( value, startPos, i - startPos ); } return norValue.ToString(); } } // StripSpaces removes spaces at the beginning and at the end of the value and replaces sequences of spaces with a single space public static void StripSpaces( char[] value, int index, ref int len ) { if ( len <= 0 ) { return; } int startPos = index; int endPos = index + len; while ( value[startPos] == 0x20 ) { startPos++; if ( startPos == endPos ) { len = 1; return; } } int offset = startPos - index; int i; for ( i = startPos; i < endPos; i++ ) { char ch; if ( ( ch = value[i] ) == 0x20 ) { int j = i + 1; while ( j < endPos && value[j] == 0x20 ) { j++; } if ( j == endPos ) { offset += ( j - i ); break; } if ( j > i+1 ) { offset += ( j - i - 1 ); i = j - 1; } } value[i-offset] = ch; } len -= offset; } public static bool IsValidLanguageID( char[] value, int startPos, int length ) { int len = length; if ( len < 2 ) { return false; } bool fSeenLetter = false; int i = startPos; XmlCharType xmlCharType = XmlCharType.Instance; char ch = value[i]; if ( xmlCharType.IsLetter(ch) ) { if ( xmlCharType.IsLetter( value[++i] ) ) { if ( len == 2 ) { return true; } len--; i++; } else if ( ('I' != ch && 'i' != ch ) && ( 'X' != ch && 'x' != ch ) ) { //IANA or custom Code return false; } if ( value[i] != '-' ) { return false; } len -= 2; while ( len-- > 0 ) { ch = value[++i]; if ( xmlCharType.IsLetter( ch ) ) { fSeenLetter = true; } else if ( ch == '-' && fSeenLetter ) { fSeenLetter = false; } else { return false; } } if ( fSeenLetter ) { return true; } } return false; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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