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//
// System.IO.UnexceptionalStreamReader.cs
//
// Authors:
// Dietmar Maurer (dietmar@ximian.com)
// Miguel de Icaza (miguel@ximian.com)
// Dick Porter (dick@ximian.com)
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) Ximian, Inc. http://www.ximian.com
// Copyright (C) 2004-2005 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.
//
// This is a wrapper around StreamReader used by System.Console that
// catches IOException so that graphical applications don't suddenly
// get IO errors when their terminal vanishes. See
// UnexceptionalStreamWriter too.
using System.Text;
using System.Runtime.InteropServices;
namespace System.IO {
internal class UnexceptionalStreamReader : StreamReader {
private static bool[] newline = new bool [Environment.NewLine.Length];
private static char newlineChar;
static UnexceptionalStreamReader () {
string n = Environment.NewLine;
if (n.Length == 1)
newlineChar = n [0];
}
/*
public UnexceptionalStreamReader(Stream stream)
: base (stream)
{
}
public UnexceptionalStreamReader(Stream stream, bool detect_encoding_from_bytemarks)
: base (stream, detect_encoding_from_bytemarks)
{
}
*/
public UnexceptionalStreamReader(Stream stream, Encoding encoding)
: base (stream, encoding)
{
}
/*
public UnexceptionalStreamReader(Stream stream, Encoding encoding, bool detect_encoding_from_bytemarks)
: base (stream, encoding, detect_encoding_from_bytemarks)
{
}
public UnexceptionalStreamReader(Stream stream, Encoding encoding, bool detect_encoding_from_bytemarks, int buffer_size)
: base (stream, encoding, detect_encoding_from_bytemarks, buffer_size)
{
}
public UnexceptionalStreamReader(string path)
: base (path)
{
}
public UnexceptionalStreamReader(string path, bool detect_encoding_from_bytemarks)
: base (path, detect_encoding_from_bytemarks)
{
}
public UnexceptionalStreamReader(string path, Encoding encoding)
: base (path, encoding)
{
}
public UnexceptionalStreamReader(string path, Encoding encoding, bool detect_encoding_from_bytemarks)
: base (path, encoding, detect_encoding_from_bytemarks)
{
}
public UnexceptionalStreamReader(string path, Encoding encoding, bool detect_encoding_from_bytemarks, int buffer_size)
: base (path, encoding, detect_encoding_from_bytemarks, buffer_size)
{
}
*/
public override int Peek ()
{
try {
return(base.Peek ());
} catch (IOException) {
}
return(-1);
}
public override int Read ()
{
try {
return(base.Read ());
} catch (IOException) {
}
return(-1);
}
public override int Read ([In, Out] char[] dest_buffer,
int index, int count)
{
if (dest_buffer == null)
throw new ArgumentNullException ("dest_buffer");
if (index < 0)
throw new ArgumentOutOfRangeException ("index", "< 0");
if (count < 0)
throw new ArgumentOutOfRangeException ("count", "< 0");
// ordered to avoid possible integer overflow
if (index > dest_buffer.Length - count)
throw new ArgumentException ("index + count > dest_buffer.Length");
int chars_read = 0;
char nl = newlineChar;
try {
while (count > 0) {
int c = base.Read ();
if (c < 0)
break;
chars_read++;
count--;
dest_buffer [index] = (char) c;
// shortcut when a new line is only one character (e.g. Linux, Mac)
if (nl != (char)0) {
if ((char)c == nl)
return chars_read;
} else {
if (CheckEOL ((char)c))
return chars_read;
}
index ++;
}
} catch (IOException) {
}
return chars_read;
}
private bool CheckEOL (char current)
{
// general case for any length (e.g. Windows)
for (int i=0; i < newline.Length; i++) {
if (!newline [i]) {
if (current == Environment.NewLine [i]) {
newline [i] = true;
return (i == newline.Length - 1);
}
break;
}
}
for (int j=0; j < newline.Length; j++)
newline [j] = false;
return false;
}
public override string ReadLine()
{
try {
return(base.ReadLine ());
} catch (IOException) {
}
return(null);
}
public override string ReadToEnd()
{
try {
return(base.ReadToEnd ());
} catch (IOException) {
}
return(null);
}
}
}
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