//
// Author: Marcin Szczepanski (marcins@zipworld.com.au)
//
+// Copyright (C) 2004 Novell (http://www.novell.com)
+//
+//
+// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
using System;
+using System.Globalization;
+using System.Runtime.InteropServices;
namespace System.IO {
+ [Serializable]
public class StringReader : TextReader {
- protected string source;
- protected char[] sourceChars;
-
- protected int nextChar;
- protected int sourceLength;
+ string source;
+ int nextChar;
+ int sourceLength;
public StringReader( string s ) {
+
+ if (s == null)
+ throw new ArgumentNullException ("s");
+
this.source = s;
nextChar = 0;
sourceLength = s.Length;
- sourceChars = s.ToCharArray();
}
- public override void Close() {
- Dispose( true );
+ public override void Close ()
+ {
+ Dispose (true);
}
- protected override void Dispose( bool disposing ) {
- return;
+ protected override void Dispose (bool disposing)
+ {
+ source = null;
+ base.Dispose (disposing);
}
public override int Peek() {
+
+ CheckObjectDisposedException ();
+
if( nextChar >= sourceLength ) {
return -1;
} else {
}
public override int Read() {
+
+ CheckObjectDisposedException ();
+
if( nextChar >= sourceLength ) {
return -1;
} else {
// the actual number of characters read, or zero if the end of the string
// has been reached and no characters are read.
- public override int Read( char[] buffer, int index, int count ) {
+ public override int Read ([In, Out] char[] buffer, int index, int count)
+ {
+ CheckObjectDisposedException ();
- if( buffer == null ) {
- throw new ArgumentNullException();
- } else if( buffer.Length - index < count ) {
- throw new ArgumentException();
- } else if( index < 0 || count < 0 ) {
- throw new ArgumentOutOfRangeException();
- }
+ if (buffer == null)
+ throw new ArgumentNullException ("buffer");
+ if (buffer.Length - index < count)
+ throw new ArgumentException ();
+ if (index < 0 || count < 0)
+ throw new ArgumentOutOfRangeException ();
int charsToRead;
- if( nextChar + count > sourceLength ) {
+ // reordered to avoir possible integer overflow
+ if (nextChar > sourceLength - count)
charsToRead = sourceLength - nextChar;
- } else {
+ else
charsToRead = count;
- }
+
+ source.CopyTo (nextChar, buffer, index, charsToRead);
- Array.Copy(sourceChars, nextChar, buffer, index, charsToRead );
-
- nextChar += count;
+ nextChar += charsToRead;
return charsToRead;
}
- public override string ReadLine() {
+ public override string ReadLine ()
+ {
// Reads until next \r or \n or \r\n, otherwise return null
- // LAMESPEC:
- // The Beta 2 SDK help says that the ReadLine method returns
- // "The next line from the input stream [...] A line is defined as a sequence of
- // characters followed by a carriage return (\r), a line feed (\n), or a carriage
- // return immediately followed by a line feed (\r\n). [...]
- // The returned value is a null reference if the end of the input stream has been reached."
- //
- // HOWEVER, the MS implementation returns the rest of the string if no \r and/or \n is found
- // in the string
-
-
- int nextCR = source.IndexOf( '\r', nextChar );
- int nextLF = source.IndexOf( '\n', nextChar );
-
- if( nextCR == -1 && nextLF == -1 ) {
- return ReadToEnd();
- }
-
- if( nextChar > sourceLength ) return null;
-
- int readTo;
-
- if( nextCR == -1 ) {
- readTo = nextLF;
- } else {
- readTo = nextCR;
- }
-
- string nextLine = source.Substring( nextChar, readTo - nextChar );
-
- if( nextLF == nextCR + 1 ) {
- nextChar = readTo + 2;
- } else {
- nextChar = readTo + 1;
- }
+ // LAMESPEC:
+ // The Beta 2 SDK help says that the ReadLine method
+ // returns "The next line from the input stream [...] A
+ // line is defined as a sequence of characters followed by
+ // a carriage return (\r), a line feed (\n), or a carriage
+ // return immediately followed by a line feed (\r\n).
+ // [...] The returned value is a null reference if the end
+ // of the input stream has been reached."
+ //
+ // HOWEVER, the MS implementation returns the rest of
+ // the string if no \r and/or \n is found in the string
+
+ CheckObjectDisposedException ();
+
+ if (nextChar >= source.Length)
+ return null;
+
+ int nextCR = source.IndexOf ('\r', nextChar);
+ int nextLF = source.IndexOf ('\n', nextChar);
+ int readTo;
+ bool consecutive = false;
+
+ if (nextCR == -1) {
+ if (nextLF == -1)
+ return ReadToEnd ();
+
+ readTo = nextLF;
+ } else if (nextLF == -1) {
+ readTo = nextCR;
+ } else {
+ readTo = (nextCR > nextLF) ? nextLF : nextCR;
+ consecutive = (nextCR + 1 == nextLF || nextLF + 1 == nextCR);
+ }
+ string nextLine = source.Substring (nextChar, readTo - nextChar);
+ nextChar = readTo + ((consecutive) ? 2 : 1);
return nextLine;
}
public override string ReadToEnd() {
+
+ CheckObjectDisposedException ();
string toEnd = source.Substring( nextChar, sourceLength - nextChar );
nextChar = sourceLength;
return toEnd;
}
+ private void CheckObjectDisposedException ()
+ {
+ if (source == null)
+ throw new ObjectDisposedException ("StringReader",
+ Locale.GetText ("Cannot read from a closed StringReader"));
+ }
}
}
projects / mono.git / blobdiff