407 lines
11 KiB
C#
407 lines
11 KiB
C#
//
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// Mono.Unix/StdioFileStream.cs
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//
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// Authors:
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// Jonathan Pryor (jonpryor@vt.edu)
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//
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// (C) 2005-2006 Jonathan Pryor
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Text;
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using Mono.Unix;
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namespace Mono.Unix {
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public class StdioFileStream : Stream
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{
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public static readonly IntPtr InvalidFileStream = IntPtr.Zero;
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public static readonly IntPtr StandardInput = Native.Stdlib.stdin;
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public static readonly IntPtr StandardOutput = Native.Stdlib.stdout;
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public static readonly IntPtr StandardError = Native.Stdlib.stderr;
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public StdioFileStream (IntPtr fileStream)
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: this (fileStream, true) {}
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public StdioFileStream (IntPtr fileStream, bool ownsHandle)
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{
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InitStream (fileStream, ownsHandle);
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}
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public StdioFileStream (IntPtr fileStream, FileAccess access)
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: this (fileStream, access, true) {}
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public StdioFileStream (IntPtr fileStream, FileAccess access, bool ownsHandle)
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{
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InitStream (fileStream, ownsHandle);
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InitCanReadWrite (access);
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}
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public StdioFileStream (string path)
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{
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if (path == null)
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throw new ArgumentNullException ("path");
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InitStream (Fopen (path, "rb"), true);
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}
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public StdioFileStream (string path, string mode)
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{
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if (path == null)
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throw new ArgumentNullException ("path");
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InitStream (Fopen (path, mode), true);
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}
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public StdioFileStream (string path, FileMode mode)
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{
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if (path == null)
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throw new ArgumentNullException ("path");
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InitStream (Fopen (path, ToFopenMode (path, mode)), true);
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}
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public StdioFileStream (string path, FileAccess access)
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{
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if (path == null)
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throw new ArgumentNullException ("path");
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InitStream (Fopen (path, ToFopenMode (path, access)), true);
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InitCanReadWrite (access);
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}
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public StdioFileStream (string path, FileMode mode, FileAccess access)
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{
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if (path == null)
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throw new ArgumentNullException ("path");
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InitStream (Fopen (path, ToFopenMode (path, mode, access)), true);
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InitCanReadWrite (access);
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}
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private static IntPtr Fopen (string path, string mode)
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{
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if (path.Length == 0)
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throw new ArgumentException ("path");
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if (mode == null)
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throw new ArgumentNullException ("mode");
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IntPtr f = Native.Stdlib.fopen (path, mode);
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if (f == IntPtr.Zero)
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throw new DirectoryNotFoundException ("path",
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UnixMarshal.CreateExceptionForLastError ());
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return f;
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}
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private void InitStream (IntPtr fileStream, bool ownsHandle)
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{
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if (InvalidFileStream == fileStream)
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throw new ArgumentException (Locale.GetText ("Invalid file stream"), "fileStream");
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this.file = fileStream;
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this.owner = ownsHandle;
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try {
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long offset = Native.Stdlib.fseek (file, 0, Native.SeekFlags.SEEK_CUR);
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if (offset != -1)
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canSeek = true;
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Native.Stdlib.fread (IntPtr.Zero, 0, 0, file);
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if (Native.Stdlib.ferror (file) == 0)
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canRead = true;
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Native.Stdlib.fwrite (IntPtr.Zero, 0, 0, file);
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if (Native.Stdlib.ferror (file) == 0)
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canWrite = true;
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Native.Stdlib.clearerr (file);
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}
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catch (Exception) {
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throw new ArgumentException (Locale.GetText ("Invalid file stream"), "fileStream");
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}
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GC.KeepAlive (this);
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}
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private void InitCanReadWrite (FileAccess access)
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{
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canRead = canRead &&
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(access == FileAccess.Read || access == FileAccess.ReadWrite);
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canWrite = canWrite &&
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(access == FileAccess.Write || access == FileAccess.ReadWrite);
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}
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private static string ToFopenMode (string file, FileMode mode)
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{
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string cmode = Native.NativeConvert.ToFopenMode (mode);
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AssertFileMode (file, mode);
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return cmode;
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}
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private static string ToFopenMode (string file, FileAccess access)
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{
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return Native.NativeConvert.ToFopenMode (access);
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}
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private static string ToFopenMode (string file, FileMode mode, FileAccess access)
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{
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string cmode = Native.NativeConvert.ToFopenMode (mode, access);
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bool exists = AssertFileMode (file, mode);
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// HACK: for open-or-create & read, mode is "rb", which doesn't create
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// files. If the file doesn't exist, we need to use "w+b" to ensure
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// file creation.
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if (mode == FileMode.OpenOrCreate && access == FileAccess.Read && !exists)
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cmode = "w+b";
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return cmode;
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}
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private static bool AssertFileMode (string file, FileMode mode)
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{
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bool exists = FileExists (file);
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if (mode == FileMode.CreateNew && exists)
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throw new IOException ("File exists and FileMode.CreateNew specified");
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if ((mode == FileMode.Open || mode == FileMode.Truncate) && !exists)
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throw new FileNotFoundException ("File doesn't exist and FileMode.Open specified", file);
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return exists;
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}
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private static bool FileExists (string file)
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{
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bool found = false;
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IntPtr f = Native.Stdlib.fopen (file, "r");
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found = f != IntPtr.Zero;
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if (f != IntPtr.Zero)
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Native.Stdlib.fclose (f);
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return found;
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}
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private void AssertNotDisposed ()
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{
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if (file == InvalidFileStream)
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throw new ObjectDisposedException ("Invalid File Stream");
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GC.KeepAlive (this);
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}
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public IntPtr Handle {
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get {
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AssertNotDisposed ();
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GC.KeepAlive (this);
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return file;
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}
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}
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public override bool CanRead {
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get {return canRead;}
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}
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public override bool CanSeek {
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get {return canSeek;}
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}
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public override bool CanWrite {
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get {return canWrite;}
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}
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public override long Length {
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get {
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AssertNotDisposed ();
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if (!CanSeek)
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throw new NotSupportedException ("File Stream doesn't support seeking");
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long curPos = Native.Stdlib.ftell (file);
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if (curPos == -1)
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throw new NotSupportedException ("Unable to obtain current file position");
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int r = Native.Stdlib.fseek (file, 0, Native.SeekFlags.SEEK_END);
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UnixMarshal.ThrowExceptionForLastErrorIf (r);
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long endPos = Native.Stdlib.ftell (file);
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if (endPos == -1)
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UnixMarshal.ThrowExceptionForLastError ();
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r = Native.Stdlib.fseek (file, curPos, Native.SeekFlags.SEEK_SET);
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UnixMarshal.ThrowExceptionForLastErrorIf (r);
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GC.KeepAlive (this);
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return endPos;
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}
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}
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public override long Position {
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get {
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AssertNotDisposed ();
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if (!CanSeek)
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throw new NotSupportedException ("The stream does not support seeking");
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long pos = Native.Stdlib.ftell (file);
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if (pos == -1)
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UnixMarshal.ThrowExceptionForLastError ();
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GC.KeepAlive (this);
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return (long) pos;
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}
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set {
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AssertNotDisposed ();
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Seek (value, SeekOrigin.Begin);
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}
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}
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public void SaveFilePosition (Native.FilePosition pos)
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{
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AssertNotDisposed ();
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int r = Native.Stdlib.fgetpos (file, pos);
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UnixMarshal.ThrowExceptionForLastErrorIf (r);
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GC.KeepAlive (this);
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}
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public void RestoreFilePosition (Native.FilePosition pos)
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{
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AssertNotDisposed ();
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if (pos == null)
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throw new ArgumentNullException ("value");
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int r = Native.Stdlib.fsetpos (file, pos);
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UnixMarshal.ThrowExceptionForLastErrorIf (r);
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GC.KeepAlive (this);
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}
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public override void Flush ()
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{
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AssertNotDisposed ();
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int r = Native.Stdlib.fflush (file);
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if (r != 0)
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UnixMarshal.ThrowExceptionForLastError ();
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GC.KeepAlive (this);
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}
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public override unsafe int Read ([In, Out] byte[] buffer, int offset, int count)
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{
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AssertNotDisposed ();
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AssertValidBuffer (buffer, offset, count);
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if (!CanRead)
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throw new NotSupportedException ("Stream does not support reading");
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ulong r = 0;
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fixed (byte* buf = &buffer[offset]) {
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r = Native.Stdlib.fread (buf, 1, (ulong) count, file);
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}
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if (r != (ulong) count) {
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if (Native.Stdlib.ferror (file) != 0)
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throw new IOException ();
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}
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GC.KeepAlive (this);
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return (int) r;
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}
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private void AssertValidBuffer (byte[] buffer, int offset, int count)
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{
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if (buffer == null)
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throw new ArgumentNullException ("buffer");
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if (offset < 0)
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throw new ArgumentOutOfRangeException ("offset", "< 0");
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if (count < 0)
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throw new ArgumentOutOfRangeException ("count", "< 0");
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if (offset > buffer.Length)
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throw new ArgumentException ("destination offset is beyond array size");
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if (offset > (buffer.Length - count))
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throw new ArgumentException ("would overrun buffer");
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}
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public void Rewind ()
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{
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AssertNotDisposed ();
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Native.Stdlib.rewind (file);
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GC.KeepAlive (this);
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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AssertNotDisposed ();
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if (!CanSeek)
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throw new NotSupportedException ("The File Stream does not support seeking");
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Native.SeekFlags sf = Native.SeekFlags.SEEK_CUR;
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switch (origin) {
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case SeekOrigin.Begin: sf = Native.SeekFlags.SEEK_SET; break;
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case SeekOrigin.Current: sf = Native.SeekFlags.SEEK_CUR; break;
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case SeekOrigin.End: sf = Native.SeekFlags.SEEK_END; break;
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default: throw new ArgumentException ("origin");
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}
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int r = Native.Stdlib.fseek (file, offset, sf);
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if (r != 0)
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throw new IOException ("Unable to seek",
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UnixMarshal.CreateExceptionForLastError ());
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long pos = Native.Stdlib.ftell (file);
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if (pos == -1)
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throw new IOException ("Unable to get current file position",
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UnixMarshal.CreateExceptionForLastError ());
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GC.KeepAlive (this);
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return pos;
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}
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public override void SetLength (long value)
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{
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throw new NotSupportedException ("ANSI C doesn't provide a way to truncate a file");
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}
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public override unsafe void Write (byte[] buffer, int offset, int count)
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{
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AssertNotDisposed ();
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AssertValidBuffer (buffer, offset, count);
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if (!CanWrite)
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throw new NotSupportedException ("File Stream does not support writing");
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ulong r = 0;
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fixed (byte* buf = &buffer[offset]) {
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r = Native.Stdlib.fwrite (buf, (ulong) 1, (ulong) count, file);
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}
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if (r != (ulong) count)
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UnixMarshal.ThrowExceptionForLastError ();
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GC.KeepAlive (this);
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}
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~StdioFileStream ()
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{
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Close ();
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}
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public override void Close ()
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{
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if (file == InvalidFileStream)
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return;
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if (owner) {
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int r = Native.Stdlib.fclose (file);
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if (r != 0)
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UnixMarshal.ThrowExceptionForLastError ();
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} else
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Flush ();
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file = InvalidFileStream;
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canRead = false;
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canSeek = false;
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canWrite = false;
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GC.SuppressFinalize (this);
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GC.KeepAlive (this);
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}
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private bool canSeek = false;
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private bool canRead = false;
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private bool canWrite = false;
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private bool owner = true;
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private IntPtr file = InvalidFileStream;
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}
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}
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// vim: noexpandtab
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