Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / IO / TextReader.cs / 1 / TextReader.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: TextReader ** ** ** Purpose: Abstract base class for all Text-only Readers. ** Subclasses will include StreamReader & StringReader. ** ** ===========================================================*/ using System; using System.Text; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using System.Reflection; using System.Security.Permissions; namespace System.IO { // This abstract base class represents a reader that can read a sequential // stream of characters. This is not intended for reading bytes - // there are methods on the Stream class to read bytes. // A subclass must minimally implement the Peek() and Read() methods. // // This class is intended for character input, not bytes. // There are methods on the Stream class for reading bytes. [Serializable()] [ComVisible(true)] public abstract class TextReader : MarshalByRefObject, IDisposable { public static readonly TextReader Null = new NullTextReader(); protected TextReader() {} // Closes this TextReader and releases any system resources associated with the // TextReader. Following a call to Close, any operations on the TextReader // may raise exceptions. // // This default method is empty, but descendant classes can override the // method to provide the appropriate functionality. public virtual void Close() { Dispose(true); } public void Dispose() { Dispose(true); } protected virtual void Dispose(bool disposing) { } // Returns the next available character without actually reading it from // the input stream. The current position of the TextReader is not changed by // this operation. The returned value is -1 if no further characters are // available. // // This default method simply returns -1. // public virtual int Peek() { return -1; } // Reads the next character from the input stream. The returned value is // -1 if no further characters are available. // // This default method simply returns -1. // public virtual int Read() { return -1; } // Reads a block of characters. This method will read up to // count characters from this TextReader into the // buffer character array starting at position // index. Returns the actual number of characters read. // public virtual int Read([In, Out] char[] buffer, int index, int count) { if (buffer==null) throw new ArgumentNullException("buffer", Environment.GetResourceString("ArgumentNull_Buffer")); if (index < 0) throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (count < 0) throw new ArgumentOutOfRangeException("count", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (buffer.Length - index < count) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); int n = 0; do { int ch = Read(); if (ch == -1) break; buffer[index + n++] = (char)ch; } while (n < count); return n; } // Reads all characters from the current position to the end of the // TextReader, and returns them as one string. public virtual String ReadToEnd() { char[] chars = new char[4096]; int len; StringBuilder sb = new StringBuilder(4096); while((len=Read(chars, 0, chars.Length)) != 0) { sb.Append(chars, 0, len); } return sb.ToString(); } // Blocking version of read. Returns only when count // characters have been read or the end of the file was reached. // public virtual int ReadBlock([In, Out] char[] buffer, int index, int count) { int i, n = 0; do { n += (i = Read(buffer, index + n, count - n)); } while (i > 0 && n < count); return n; } // Reads a line. 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. The resulting string does not // contain the terminating carriage return and/or line feed. The returned // value is null if the end of the input stream has been reached. // public virtual String ReadLine() { StringBuilder sb = new StringBuilder(); while (true) { int ch = Read(); if (ch == -1) break; if (ch == '\r' || ch == '\n') { if (ch == '\r' && Peek() == '\n') Read(); return sb.ToString(); } sb.Append((char)ch); } if (sb.Length > 0) return sb.ToString(); return null; } [HostProtection(Synchronization=true)] public static TextReader Synchronized(TextReader reader) { if (reader==null) throw new ArgumentNullException("reader"); if (reader is SyncTextReader) return reader; return new SyncTextReader(reader); } [Serializable()] private sealed class NullTextReader : TextReader { public override int Read(char[] buffer, int index, int count) { return 0; } public override String ReadLine() { return null; } } [Serializable()] internal sealed class SyncTextReader : TextReader { internal TextReader _in; internal SyncTextReader(TextReader t) { _in = t; } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override void Close() { // So that any overriden Close() gets run _in.Close(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] protected override void Dispose(bool disposing) { // Explicitly pick up a potentially methodimpl'ed Dispose if (disposing) ((IDisposable)_in).Dispose(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int Peek() { return _in.Peek(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int Read() { return _in.Read(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int Read([In, Out] char[] buffer, int index, int count) { return _in.Read(buffer, index, count); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int ReadBlock([In, Out] char[] buffer, int index, int count) { return _in.ReadBlock(buffer, index, count); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override String ReadLine() { return _in.ReadLine(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override String ReadToEnd() { return _in.ReadToEnd(); } } } }
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