104 lines
2.7 KiB
C#
104 lines
2.7 KiB
C#
//
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// MdocFile.cs: File utility methods
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//
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// Author:
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// Jonathan Pryor <jpryor@novell.com>
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//
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// Copyright (c) 2010 Novell, Inc. (http://www.novell.com)
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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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namespace Mono.Documentation {
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static class MdocFile {
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public static void UpdateFile (string file, Action<string> creator)
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{
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if (!File.Exists (file) || file == "-") {
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creator (file);
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return;
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}
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string temp = Path.GetTempFileName ();
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bool move = true;
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try {
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creator (temp);
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using (var a = File.OpenRead (file))
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using (var b = File.OpenRead (temp)) {
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if (a.Length == b.Length)
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move = !FileContentsIdentical (a, b);
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}
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if (move) {
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DeleteFile (file);
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File.Move (temp, file);
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}
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}
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finally {
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if (!move && File.Exists (temp))
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File.Delete (temp);
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}
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}
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public static void DeleteFile (string fileToDelete, int retries = 10)
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{
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var startRetries = retries;
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var fi = new FileInfo(fileToDelete);
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if (fi.Exists) {
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fi.Delete ();
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fi.Refresh ();
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while (fi.Exists && retries-- > 0) {
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System.Threading.Thread.Sleep (100);
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fi.Refresh ();
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}
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fi.Refresh ();
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if (fi.Exists)
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throw new IOException ($"Unable to delete file '{fileToDelete}' after {startRetries} attempts.");
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}
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}
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static bool FileContentsIdentical (Stream a, Stream b)
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{
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byte[] ba = new byte[4096];
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byte[] bb = new byte[4096];
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int ra, rb;
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while ((ra = a.Read (ba, 0, ba.Length)) > 0 &&
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(rb = b.Read (bb, 0, bb.Length)) > 0) {
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if (ra != rb)
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return false;
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for (int i = 0; i < ra; ++i) {
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if (ba [i] != bb [i])
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return false;
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}
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}
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return true;
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}
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}
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}
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