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Imported Upstream version 4.2.0.179

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Former-commit-id: 4610231f55806d2a05ed69e5ff3faa7336cc1479
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Xamarin Public Jenkins
2015-08-26 07:17:56 -04:00
committed by Jo Shields
parent aa7da660d6
commit c042cd0c52
7507 changed files with 90259 additions and 657307 deletions
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47
external/referencesource/System.Configuration/System/Configuration/FileUtil.cs vendored Normal file
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//------------------------------------------------------------------------------
// <copyright file="FileUtil.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Configuration {
using System;
using System.IO;
using Microsoft.Win32;
using System.Runtime.InteropServices;
static internal class FileUtil {
const int HRESULT_WIN32_FILE_NOT_FOUND = unchecked((int)0x80070002);
const int HRESULT_WIN32_PATH_NOT_FOUND = unchecked((int)0x80070003);
//
// Use to avoid the perf hit of a Demand when the Demand is not necessary for security.
//
// If trueOnError is set, then return true if we cannot confirm that the file does NOT exist.
//
internal static bool FileExists(string filename, bool trueOnError) {
UnsafeNativeMethods.WIN32_FILE_ATTRIBUTE_DATA data;
bool ok = UnsafeNativeMethods.GetFileAttributesEx(filename, UnsafeNativeMethods.GetFileExInfoStandard, out data);
if (ok) {
// The path exists. Return true if it is a file, false if a directory.
return (data.fileAttributes & (int) FileAttributes.Directory) != (int) FileAttributes.Directory;
}
else {
if (!trueOnError) {
return false;
}
else {
// Return true if we cannot confirm that the file does NOT exist.
int hr = Marshal.GetHRForLastWin32Error();
if (hr == HRESULT_WIN32_FILE_NOT_FOUND || hr == HRESULT_WIN32_PATH_NOT_FOUND) {
return false;
}
else {
return true;
}
}
}
}
}
}