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Copy pathFile.cs
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718 lines (605 loc) · 27.4 KB
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// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Globalization;
using System.Runtime.Versioning;
using System.Security;
using System.Text;
using System.Threading;
using Microsoft.Win32.SafeHandles;
namespace System.IO
{
// Class for creating FileStream objects, and some basic file management
// routines such as Delete, etc.
public static class File
{
public static StreamReader OpenText(String path)
{
if (path == null)
throw new ArgumentNullException("path");
Contract.EndContractBlock();
Stream stream = FileStream.InternalOpen(path);
return new StreamReader(stream);
}
public static StreamWriter CreateText(String path)
{
if (path == null)
throw new ArgumentNullException("path");
Contract.EndContractBlock();
Stream stream = FileStream.InternalCreate(path);
return new StreamWriter(stream);
}
public static StreamWriter AppendText(String path)
{
if (path == null)
throw new ArgumentNullException("path");
Contract.EndContractBlock();
Stream stream = FileStream.InternalAppend(path);
return new StreamWriter(stream);
}
// Copies an existing file to a new file. An exception is raised if the
// destination file already exists. Use the
// Copy(String, String, boolean) method to allow
// overwriting an existing file.
//
// The caller must have certain FileIOPermissions. The caller must have
// Read permission to sourceFileName and Create
// and Write permissions to destFileName.
//
public static void Copy(String sourceFileName, String destFileName)
{
if (sourceFileName == null)
throw new ArgumentNullException("sourceFileName", SR.ArgumentNull_FileName);
if (destFileName == null)
throw new ArgumentNullException("destFileName", SR.ArgumentNull_FileName);
if (sourceFileName.Length == 0)
throw new ArgumentException(SR.Argument_EmptyFileName, "sourceFileName");
if (destFileName.Length == 0)
throw new ArgumentException(SR.Argument_EmptyFileName, "destFileName");
Contract.EndContractBlock();
InternalCopy(sourceFileName, destFileName, false);
}
// Copies an existing file to a new file. If overwrite is
// false, then an IOException is thrown if the destination file
// already exists. If overwrite is true, the file is
// overwritten.
//
// The caller must have certain FileIOPermissions. The caller must have
// Read permission to sourceFileName
// and Write permissions to destFileName.
//
public static void Copy(String sourceFileName, String destFileName, bool overwrite)
{
if (sourceFileName == null)
throw new ArgumentNullException("sourceFileName", SR.ArgumentNull_FileName);
if (destFileName == null)
throw new ArgumentNullException("destFileName", SR.ArgumentNull_FileName);
if (sourceFileName.Length == 0)
throw new ArgumentException(SR.Argument_EmptyFileName, "sourceFileName");
if (destFileName.Length == 0)
throw new ArgumentException(SR.Argument_EmptyFileName, "destFileName");
Contract.EndContractBlock();
InternalCopy(sourceFileName, destFileName, overwrite);
}
/// <devdoc>
/// Note: This returns the fully qualified name of the destination file.
/// </devdoc>
[System.Security.SecuritySafeCritical]
internal static String InternalCopy(String sourceFileName, String destFileName, bool overwrite)
{
Contract.Requires(sourceFileName != null);
Contract.Requires(destFileName != null);
Contract.Requires(sourceFileName.Length > 0);
Contract.Requires(destFileName.Length > 0);
String fullSourceFileName = PathHelpers.GetFullPathInternal(sourceFileName);
String fullDestFileName = PathHelpers.GetFullPathInternal(destFileName);
FileSystem.Current.CopyFile(fullSourceFileName, fullDestFileName, overwrite);
return fullDestFileName;
}
// Creates a file in a particular path. If the file exists, it is replaced.
// The file is opened with ReadWrite accessand cannot be opened by another
// application until it has been closed. An IOException is thrown if the
// directory specified doesn't exist.
//
// Your application must have Create, Read, and Write permissions to
// the file.
//
public static FileStream Create(String path)
{
return Create(path, FileStream.DefaultBufferSize);
}
// Creates a file in a particular path. If the file exists, it is replaced.
// The file is opened with ReadWrite access and cannot be opened by another
// application until it has been closed. An IOException is thrown if the
// directory specified doesn't exist.
//
// Your application must have Create, Read, and Write permissions to
// the file.
//
public static FileStream Create(String path, int bufferSize)
{
return new FileStream(path, FileMode.Create, FileAccess.ReadWrite, FileShare.None, bufferSize);
}
public static FileStream Create(String path, int bufferSize, FileOptions options)
{
return new FileStream(path, FileMode.Create, FileAccess.ReadWrite,
FileShare.None, bufferSize, options);
}
// Deletes a file. The file specified by the designated path is deleted.
// If the file does not exist, Delete succeeds without throwing
// an exception.
//
// On NT, Delete will fail for a file that is open for normal I/O
// or a file that is memory mapped.
//
// Your application must have Delete permission to the target file.
//
[System.Security.SecuritySafeCritical]
public static void Delete(String path)
{
if (path == null)
throw new ArgumentNullException("path");
Contract.EndContractBlock();
String fullPath = PathHelpers.GetFullPathInternal(path);
FileSystem.Current.DeleteFile(fullPath);
}
// Tests if a file exists. The result is true if the file
// given by the specified path exists; otherwise, the result is
// false. Note that if path describes a directory,
// Exists will return true.
//
// Your application must have Read permission for the target directory.
//
[System.Security.SecuritySafeCritical]
public static bool Exists(String path)
{
try
{
if (path == null)
return false;
if (path.Length == 0)
return false;
path = PathHelpers.GetFullPathInternal(path);
// After normalizing, check whether path ends in directory separator.
// Otherwise, FillAttributeInfo removes it and we may return a false positive.
// GetFullPath should never return null
Debug.Assert(path != null, "File.Exists: GetFullPath returned null");
if (path.Length > 0 && PathInternal.IsDirectorySeparator(path[path.Length - 1]))
{
return false;
}
return InternalExists(path);
}
catch (ArgumentException) { }
catch (NotSupportedException) { } // Security can throw this on ":"
catch (SecurityException) { }
catch (IOException) { }
catch (UnauthorizedAccessException) { }
return false;
}
[System.Security.SecurityCritical] // auto-generated
internal static bool InternalExists(String path)
{
return FileSystem.Current.FileExists(path);
}
public static FileStream Open(String path, FileMode mode)
{
return Open(path, mode, (mode == FileMode.Append ? FileAccess.Write : FileAccess.ReadWrite), FileShare.None);
}
public static FileStream Open(String path, FileMode mode, FileAccess access)
{
return Open(path, mode, access, FileShare.None);
}
public static FileStream Open(String path, FileMode mode, FileAccess access, FileShare share)
{
return new FileStream(path, mode, access, share);
}
internal static DateTimeOffset GetUtcDateTimeOffset(DateTime dateTime)
{
// File and Directory UTC APIs treat a DateTimeKind.Unspecified as UTC whereas
// ToUniversalTime treats this as local.
if (dateTime.Kind == DateTimeKind.Unspecified)
{
return DateTime.SpecifyKind(dateTime, DateTimeKind.Utc);
}
return dateTime.ToUniversalTime();
}
public static void SetCreationTime(String path, DateTime creationTimeUtc)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
FileSystem.Current.SetCreationTime(fullPath, creationTimeUtc, asDirectory: false);
}
public static void SetCreationTimeUtc(String path, DateTime creationTime)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
FileSystem.Current.SetCreationTime(fullPath, GetUtcDateTimeOffset(creationTime), asDirectory: false);
}
[System.Security.SecuritySafeCritical]
public static DateTime GetCreationTime(String path)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
return FileSystem.Current.GetCreationTime(fullPath).LocalDateTime;
}
[System.Security.SecuritySafeCritical] // auto-generated
public static DateTime GetCreationTimeUtc(String path)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
return FileSystem.Current.GetCreationTime(fullPath).UtcDateTime;
}
public static void SetLastAccessTime(String path, DateTime lastAccessTime)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
FileSystem.Current.SetLastAccessTime(fullPath, lastAccessTime, asDirectory: false);
}
public static void SetLastAccessTimeUtc(String path, DateTime lastAccessTimeUtc)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
FileSystem.Current.SetLastAccessTime(fullPath, GetUtcDateTimeOffset(lastAccessTimeUtc), asDirectory: false);
}
[System.Security.SecuritySafeCritical]
public static DateTime GetLastAccessTime(String path)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
return FileSystem.Current.GetLastAccessTime(fullPath).LocalDateTime;
}
[System.Security.SecuritySafeCritical] // auto-generated
public static DateTime GetLastAccessTimeUtc(String path)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
return FileSystem.Current.GetLastAccessTime(fullPath).UtcDateTime;
}
public static void SetLastWriteTime(String path, DateTime lastWriteTime)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
FileSystem.Current.SetLastWriteTime(fullPath, lastWriteTime, asDirectory: false);
}
public static void SetLastWriteTimeUtc(String path, DateTime lastWriteTimeUtc)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
FileSystem.Current.SetLastWriteTime(fullPath, GetUtcDateTimeOffset(lastWriteTimeUtc), asDirectory: false);
}
[System.Security.SecuritySafeCritical]
public static DateTime GetLastWriteTime(String path)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
return FileSystem.Current.GetLastWriteTime(fullPath).LocalDateTime;
}
[System.Security.SecuritySafeCritical] // auto-generated
public static DateTime GetLastWriteTimeUtc(String path)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
return FileSystem.Current.GetLastWriteTime(fullPath).UtcDateTime;
}
[System.Security.SecuritySafeCritical]
public static FileAttributes GetAttributes(String path)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
return FileSystem.Current.GetAttributes(fullPath);
}
[System.Security.SecurityCritical]
public static void SetAttributes(String path, FileAttributes fileAttributes)
{
String fullPath = PathHelpers.GetFullPathInternal(path);
FileSystem.Current.SetAttributes(fullPath, fileAttributes);
}
[System.Security.SecuritySafeCritical]
public static FileStream OpenRead(String path)
{
return new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
}
public static FileStream OpenWrite(String path)
{
return new FileStream(path, FileMode.OpenOrCreate,
FileAccess.Write, FileShare.None);
}
[System.Security.SecuritySafeCritical] // auto-generated
public static String ReadAllText(String path)
{
if (path == null)
throw new ArgumentNullException("path");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
return InternalReadAllText(path, Encoding.UTF8);
}
[System.Security.SecuritySafeCritical] // auto-generated
public static String ReadAllText(String path, Encoding encoding)
{
if (path == null)
throw new ArgumentNullException("path");
if (encoding == null)
throw new ArgumentNullException("encoding");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
return InternalReadAllText(path, encoding);
}
[System.Security.SecurityCritical]
private static String InternalReadAllText(String path, Encoding encoding)
{
Contract.Requires(path != null);
Contract.Requires(encoding != null);
Contract.Requires(path.Length > 0);
Stream stream = FileStream.InternalOpen(path, useAsync: false);
using (StreamReader sr = new StreamReader(stream, encoding, true))
return sr.ReadToEnd();
}
[System.Security.SecuritySafeCritical] // auto-generated
public static void WriteAllText(String path, String contents)
{
if (path == null)
throw new ArgumentNullException("path");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
InternalWriteAllText(path, contents, UTF8NoBOM);
}
[System.Security.SecuritySafeCritical] // auto-generated
public static void WriteAllText(String path, String contents, Encoding encoding)
{
if (path == null)
throw new ArgumentNullException("path");
if (encoding == null)
throw new ArgumentNullException("encoding");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
InternalWriteAllText(path, contents, encoding);
}
[System.Security.SecurityCritical]
private static void InternalWriteAllText(String path, String contents, Encoding encoding)
{
Contract.Requires(path != null);
Contract.Requires(encoding != null);
Contract.Requires(path.Length > 0);
Stream stream = FileStream.InternalCreate(path, useAsync: false);
using (StreamWriter sw = new StreamWriter(stream, encoding))
sw.Write(contents);
}
[System.Security.SecuritySafeCritical] // auto-generated
public static byte[] ReadAllBytes(String path)
{
return InternalReadAllBytes(path);
}
[System.Security.SecurityCritical]
private static byte[] InternalReadAllBytes(String path)
{
// bufferSize == 1 used to avoid unnecessary buffer in FileStream
using (FileStream fs = FileStream.InternalOpen(path, bufferSize: 1, useAsync: false))
{
long fileLength = fs.Length;
if (fileLength > Int32.MaxValue)
throw new IOException(SR.IO_FileTooLong2GB);
int index = 0;
int count = (int)fileLength;
byte[] bytes = new byte[count];
while (count > 0)
{
int n = fs.Read(bytes, index, count);
if (n == 0)
throw __Error.GetEndOfFile();
index += n;
count -= n;
}
return bytes;
}
}
[System.Security.SecuritySafeCritical] // auto-generated
public static void WriteAllBytes(String path, byte[] bytes)
{
if (path == null)
throw new ArgumentNullException("path", SR.ArgumentNull_Path);
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
if (bytes == null)
throw new ArgumentNullException("bytes");
Contract.EndContractBlock();
InternalWriteAllBytes(path, bytes);
}
[System.Security.SecurityCritical]
private static void InternalWriteAllBytes(String path, byte[] bytes)
{
Contract.Requires(path != null);
Contract.Requires(path.Length != 0);
Contract.Requires(bytes != null);
using (FileStream fs = FileStream.InternalCreate(path, useAsync: false))
{
fs.Write(bytes, 0, bytes.Length);
}
}
public static String[] ReadAllLines(String path)
{
if (path == null)
throw new ArgumentNullException("path");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
return InternalReadAllLines(path, Encoding.UTF8);
}
public static String[] ReadAllLines(String path, Encoding encoding)
{
if (path == null)
throw new ArgumentNullException("path");
if (encoding == null)
throw new ArgumentNullException("encoding");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
return InternalReadAllLines(path, encoding);
}
private static String[] InternalReadAllLines(String path, Encoding encoding)
{
Contract.Requires(path != null);
Contract.Requires(encoding != null);
Contract.Requires(path.Length != 0);
String line;
List<String> lines = new List<String>();
Stream stream = FileStream.InternalOpen(path, useAsync: false);
using (StreamReader sr = new StreamReader(stream, encoding))
while ((line = sr.ReadLine()) != null)
lines.Add(line);
return lines.ToArray();
}
public static IEnumerable<String> ReadLines(String path)
{
if (path == null)
throw new ArgumentNullException("path");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
return ReadLinesIterator.CreateIterator(path, Encoding.UTF8);
}
public static IEnumerable<String> ReadLines(String path, Encoding encoding)
{
if (path == null)
throw new ArgumentNullException("path");
if (encoding == null)
throw new ArgumentNullException("encoding");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
return ReadLinesIterator.CreateIterator(path, encoding);
}
public static void WriteAllLines(String path, IEnumerable<String> contents)
{
if (path == null)
throw new ArgumentNullException("path");
if (contents == null)
throw new ArgumentNullException("contents");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
Stream stream = FileStream.InternalCreate(path, useAsync: false);
InternalWriteAllLines(new StreamWriter(stream, UTF8NoBOM), contents);
}
public static void WriteAllLines(String path, IEnumerable<String> contents, Encoding encoding)
{
if (path == null)
throw new ArgumentNullException("path");
if (contents == null)
throw new ArgumentNullException("contents");
if (encoding == null)
throw new ArgumentNullException("encoding");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
Stream stream = FileStream.InternalCreate(path, useAsync: false);
InternalWriteAllLines(new StreamWriter(stream, encoding), contents);
}
private static void InternalWriteAllLines(TextWriter writer, IEnumerable<String> contents)
{
Contract.Requires(writer != null);
Contract.Requires(contents != null);
using (writer)
{
foreach (String line in contents)
{
writer.WriteLine(line);
}
}
}
public static void AppendAllText(String path, String contents)
{
if (path == null)
throw new ArgumentNullException("path");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
InternalAppendAllText(path, contents, UTF8NoBOM);
}
public static void AppendAllText(String path, String contents, Encoding encoding)
{
if (path == null)
throw new ArgumentNullException("path");
if (encoding == null)
throw new ArgumentNullException("encoding");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
InternalAppendAllText(path, contents, encoding);
}
private static void InternalAppendAllText(String path, String contents, Encoding encoding)
{
Contract.Requires(path != null);
Contract.Requires(encoding != null);
Contract.Requires(path.Length > 0);
Stream stream = FileStream.InternalAppend(path, useAsync: false);
using (StreamWriter sw = new StreamWriter(stream, encoding))
sw.Write(contents);
}
public static void AppendAllLines(String path, IEnumerable<String> contents)
{
if (path == null)
throw new ArgumentNullException("path");
if (contents == null)
throw new ArgumentNullException("contents");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
Stream stream = FileStream.InternalAppend(path, useAsync: false);
InternalWriteAllLines(new StreamWriter(stream, UTF8NoBOM), contents);
}
public static void AppendAllLines(String path, IEnumerable<String> contents, Encoding encoding)
{
if (path == null)
throw new ArgumentNullException("path");
if (contents == null)
throw new ArgumentNullException("contents");
if (encoding == null)
throw new ArgumentNullException("encoding");
if (path.Length == 0)
throw new ArgumentException(SR.Argument_EmptyPath, "path");
Contract.EndContractBlock();
Stream stream = FileStream.InternalAppend(path, useAsync: false);
InternalWriteAllLines(new StreamWriter(stream, encoding), contents);
}
// Moves a specified file to a new location and potentially a new file name.
// This method does work across volumes.
//
// The caller must have certain FileIOPermissions. The caller must
// have Read and Write permission to
// sourceFileName and Write
// permissions to destFileName.
//
[System.Security.SecuritySafeCritical]
public static void Move(String sourceFileName, String destFileName)
{
if (sourceFileName == null)
throw new ArgumentNullException("sourceFileName", SR.ArgumentNull_FileName);
if (destFileName == null)
throw new ArgumentNullException("destFileName", SR.ArgumentNull_FileName);
if (sourceFileName.Length == 0)
throw new ArgumentException(SR.Argument_EmptyFileName, "sourceFileName");
if (destFileName.Length == 0)
throw new ArgumentException(SR.Argument_EmptyFileName, "destFileName");
Contract.EndContractBlock();
String fullSourceFileName = PathHelpers.GetFullPathInternal(sourceFileName);
String fullDestFileName = PathHelpers.GetFullPathInternal(destFileName);
if (!InternalExists(fullSourceFileName))
{
throw new FileNotFoundException(SR.Format(SR.IO_FileNotFound_FileName, fullSourceFileName), fullSourceFileName);
}
FileSystem.Current.MoveFile(fullSourceFileName, fullDestFileName);
}
private static volatile Encoding _UTF8NoBOM;
private static Encoding UTF8NoBOM
{
get
{
if (_UTF8NoBOM == null)
{
// No need for double lock - we just want to avoid extra
// allocations in the common case.
UTF8Encoding noBOM = new UTF8Encoding(false, true);
Interlocked.MemoryBarrier();
_UTF8NoBOM = noBOM;
}
return _UTF8NoBOM;
}
}
}
}