public void ReturnsZeroForEmptyFile(FileOptions options)
{
using (SafeFileHandle handle = File.OpenHandle(GetTestFilePath(), FileMode.CreateNew, FileAccess.Write, options: options))
{
Assert.Equal(0, RandomAccess.GetLength(handle));
}
}
public TroikaArchive(string path)
{
Path = path;
_fileHandle = File.OpenHandle(
path,
FileMode.Open,
FileAccess.Read,
FileShare.Read,
FileOptions.RandomAccess
);
_fileStream = new FileStream(_fileHandle, FileAccess.Read);
_fileLength = RandomAccess.GetLength(_fileHandle);
// Read the file table
try
{
ReadFileTable(_fileHandle);
}
catch
{
_fileHandle.Dispose();
throw;
}
}
public void ModifiesTheActualFileSize(FileOptions options)
{
using (SafeFileHandle handle = File.OpenHandle(GetTestFilePath(), FileMode.CreateNew, FileAccess.Write, options: options))
{
RandomAccess.SetLength(handle, FileSize);
Assert.Equal(FileSize, RandomAccess.GetLength(handle));
}
}
private FileSystemMetadata GetFileSystemMetadata(FileSystemInfo info)
{
var result = new FileSystemMetadata
{
Exists = info.Exists,
FullName = info.FullName,
Extension = info.Extension,
Name = info.Name
};
if (result.Exists)
{
result.IsDirectory = info is DirectoryInfo || (info.Attributes & FileAttributes.Directory) == FileAttributes.Directory;
// if (!result.IsDirectory)
// {
// result.IsHidden = (info.Attributes & FileAttributes.Hidden) == FileAttributes.Hidden;
// }
if (info is FileInfo fileInfo)
{
result.Length = fileInfo.Length;
// Issue #2354 get the size of files behind symbolic links. Also Enum.HasFlag is bad as it boxes!
if ((fileInfo.Attributes & FileAttributes.ReparsePoint) == FileAttributes.ReparsePoint)
{
try
{
using (var fileHandle = File.OpenHandle(fileInfo.FullName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
result.Length = RandomAccess.GetLength(fileHandle);
}
}
catch (FileNotFoundException ex)
{
// Dangling symlinks cannot be detected before opening the file unfortunately...
_logger.LogError(ex, "Reading the file size of the symlink at {Path} failed. Marking the file as not existing.", fileInfo.FullName);
result.Exists = false;
}
catch (UnauthorizedAccessException ex)
{
_logger.LogError(ex, "Reading the file at {Path} failed due to a permissions exception.", fileInfo.FullName);
}
}
}
result.CreationTimeUtc = GetCreationTimeUtc(info);
result.LastWriteTimeUtc = GetLastWriteTimeUtc(info);
}
else
{
result.IsDirectory = info is DirectoryInfo;
}
return(result);
}
/// <summary>
/// 读取二进制文件。
/// </summary>
/// <param name="path">给定的文件路径。</param>
/// <param name="fileOffset">给定的读取偏移量。</param>
/// <returns>返回字节数组。</returns>
public static byte[] ReadBinaryFile(this string path, long fileOffset)
{
using (var handle = File.OpenHandle(path))
{
var length = RandomAccess.GetLength(handle);
var buffer = new byte[length - fileOffset];
var readLength = RandomAccess.Read(handle, buffer, fileOffset);
return(buffer);
}
}
public void ReadFromBeyondEndOfFileReturnsZero(FileOptions options)
{
string filePath = GetTestFilePath();
File.WriteAllBytes(filePath, new byte[100]);
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.Open, options: options))
{
long eof = RandomAccess.GetLength(handle);
Assert.Equal(0, RandomAccess.Read(handle, new byte[1], fileOffset: eof + 1));
}
}
public void ReturnsExactSizeForNonEmptyFiles(FileOptions options)
{
const int fileSize = 123;
string filePath = GetTestFilePath();
File.WriteAllBytes(filePath, new byte[fileSize]);
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.Open, options: options))
{
Assert.Equal(fileSize, RandomAccess.GetLength(handle));
}
}
public async Task ReadFromBeyondEndOfFileReturnsZeroAsync(FileOptions options)
{
string filePath = GetTestFilePath();
File.WriteAllBytes(filePath, new byte[100]);
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.Open, options: options))
{
long eof = RandomAccess.GetLength(handle);
Assert.Equal(0, await RandomAccess.ReadAsync(handle, new Memory <byte>[] { new byte[1] }, fileOffset: eof + 1));
}
}
public void AllowsForShrinking(FileOptions options)
{
using (SafeFileHandle handle = File.OpenHandle(GetTestFilePath(), FileMode.CreateNew, FileAccess.Write, options: options))
{
RandomAccess.SetLength(handle, FileSize);
Assert.Equal(FileSize, RandomAccess.GetLength(handle));
RandomAccess.SetLength(handle, FileSize / 2);
Assert.Equal(FileSize / 2, RandomAccess.GetLength(handle));
RandomAccess.SetLength(handle, 0);
Assert.Equal(0, RandomAccess.GetLength(handle));
}
}
public void WriteBeyondEndOfFileExtendsTheFile(FileOptions options)
{
string filePath = GetTestFilePath();
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.CreateNew, FileAccess.Write, options: options))
{
Assert.Equal(0, RandomAccess.GetLength(handle));
RandomAccess.Write(handle, new ReadOnlyMemory <byte>[] { new byte[1] {
1
} }, fileOffset: 1);
Assert.Equal(2, RandomAccess.GetLength(handle));
}
Assert.Equal(new byte[] { 0, 1 }, File.ReadAllBytes(filePath));
}
public void ReturnsActualLengthForDevices(FileOptions options)
{
// Both File.Exists and Path.Exists return false when "\\?\PhysicalDrive0" exists
// that is why we just try and swallow the exception when it occurs.
// Exception can be also thrown when the file is in use (#73925).
try
{
using (SafeFileHandle handle = File.OpenHandle(@"\\?\PhysicalDrive0", FileMode.Open, options: options))
{
long length = RandomAccess.GetLength(handle);
Assert.True(length > 0);
}
}
catch (IOException) { }
}
public async Task WriteBeyondEndOfFileExtendsTheFileAsync(FileOptions options)
{
string filePath = GetTestFilePath();
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.CreateNew, FileAccess.Write, options: options))
{
Assert.Equal(0, RandomAccess.GetLength(handle));
await RandomAccess.WriteAsync(handle, new byte[1] {
1
}, fileOffset : 1);
Assert.Equal(2, RandomAccess.GetLength(handle));
}
Assert.Equal(new byte[] { 0, 1 }, await File.ReadAllBytesAsync(filePath));
}
/// <summary>Read the database for the specified terminal from the specified directory.</summary>
/// <param name="term">The identifier for the terminal.</param>
/// <param name="directoryPath">The path to the directory containing terminfo database files.</param>
/// <returns>The database, or null if it could not be found.</returns>
internal static Database?ReadDatabase(string?term, string?directoryPath)
{
if (string.IsNullOrEmpty(term) || string.IsNullOrEmpty(directoryPath))
{
return(null);
}
Span <char> stackBuffer = stackalloc char[256];
SafeFileHandle?fd;
if (!TryOpen(string.Create(null, stackBuffer, $"{directoryPath}/{term[0]}/{term}"), out fd) && // /directory/termFirstLetter/term (Linux)
!TryOpen(string.Create(null, stackBuffer, $"{directoryPath}/{(int)term[0]:X}/{term}"), out fd)) // /directory/termFirstLetterAsHex/term (Mac)
{
return(null);
}
using (fd)
{
// Read in all of the terminfo data
long termInfoLength = RandomAccess.GetLength(fd);
const int MaxTermInfoLength = 4096; // according to the term and tic man pages, 4096 is the terminfo file size max
const int HeaderLength = 12;
if (termInfoLength <= HeaderLength || termInfoLength > MaxTermInfoLength)
{
throw new InvalidOperationException(SR.IO_TermInfoInvalid);
}
byte[] data = new byte[(int)termInfoLength];
long fileOffset = 0;
do
{
int bytesRead = RandomAccess.Read(fd, new Span <byte>(data, (int)fileOffset, (int)(termInfoLength - fileOffset)), fileOffset);
if (bytesRead == 0)
{
throw new InvalidOperationException(SR.IO_TermInfoInvalid);
}
fileOffset += bytesRead;
} while (fileOffset < termInfoLength);
// Create the database from the data
return(new Database(term, data));
}
}
/// <inheritdoc />
protected override FileMetadata GetFileInfo(string path)
{
var fileInfo = new FileInfo(path);
var length = fileInfo.Length;
// This may or may not be fixed in .NET 6, but looks like it will not https://github.com/dotnet/aspnetcore/issues/34371
if ((fileInfo.Attributes & FileAttributes.ReparsePoint) == FileAttributes.ReparsePoint)
{
using var fileHandle = File.OpenHandle(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
length = RandomAccess.GetLength(fileHandle);
}
return(new FileMetadata
{
Exists = fileInfo.Exists,
Length = length,
LastModified = fileInfo.LastWriteTimeUtc
});
}
private static bool CompareTimeZoneFile(string filePath, byte[] buffer, byte[] rawData)
{
try
{
// bufferSize == 1 used to avoid unnecessary buffer in FileStream
using (SafeFileHandle sfh = File.OpenHandle(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
long fileLength = RandomAccess.GetLength(sfh);
if (fileLength == rawData.Length)
{
int index = 0;
int count = rawData.Length;
while (count > 0)
{
int n = RandomAccess.Read(sfh, buffer.AsSpan(index, count), index);
if (n == 0)
{
ThrowHelper.ThrowEndOfFileException();
}
int end = index + n;
for (; index < end; index++)
{
if (buffer[index] != rawData[index])
{
return(false);
}
}
count -= n;
}
return(true);
}
}
}
catch (IOException) { }
catch (SecurityException) { }
catch (UnauthorizedAccessException) { }
return(false);
}
public static MemoryMappedFile CreateFromFile(string path, FileMode mode, string?mapName, long capacity,
MemoryMappedFileAccess access)
{
ArgumentNullException.ThrowIfNull(path);
if (mapName != null && mapName.Length == 0)
{
throw new ArgumentException(SR.Argument_MapNameEmptyString);
}
if (capacity < 0)
{
throw new ArgumentOutOfRangeException(nameof(capacity), SR.ArgumentOutOfRange_PositiveOrDefaultCapacityRequired);
}
if (access < MemoryMappedFileAccess.ReadWrite ||
access > MemoryMappedFileAccess.ReadWriteExecute)
{
throw new ArgumentOutOfRangeException(nameof(access));
}
if (mode == FileMode.Append)
{
throw new ArgumentException(SR.Argument_NewMMFAppendModeNotAllowed, nameof(mode));
}
if (mode == FileMode.Truncate)
{
throw new ArgumentException(SR.Argument_NewMMFTruncateModeNotAllowed, nameof(mode));
}
if (access == MemoryMappedFileAccess.Write)
{
throw new ArgumentException(SR.Argument_NewMMFWriteAccessNotAllowed, nameof(access));
}
bool existed = mode switch
{
FileMode.Open => true, // FileStream ctor will throw if the file doesn't exist
FileMode.CreateNew => false,
_ => File.Exists(path)
};
SafeFileHandle fileHandle = File.OpenHandle(path, mode, GetFileAccess(access), FileShare.Read, FileOptions.None);
long fileSize = 0;
if (mode is not(FileMode.CreateNew or FileMode.Create)) // the file is brand new and it's empty
{
try
{
fileSize = RandomAccess.GetLength(fileHandle);
}
catch
{
fileHandle.Dispose();
throw;
}
}
if (capacity == 0 && fileSize == 0)
{
CleanupFile(fileHandle, existed, path);
throw new ArgumentException(SR.Argument_EmptyFile);
}
if (capacity == DefaultSize)
{
capacity = fileSize;
}
SafeMemoryMappedFileHandle?handle;
try
{
handle = CreateCore(fileHandle, mapName, HandleInheritability.None,
access, MemoryMappedFileOptions.None, capacity, fileSize);
}
catch
{
CleanupFile(fileHandle, existed, path);
throw;
}
Debug.Assert(handle != null);
Debug.Assert(!handle.IsInvalid);
return(new MemoryMappedFile(handle, fileHandle, false));
}
protected override long MethodUnderTest(SafeFileHandle handle, byte[] bytes, long fileOffset) => RandomAccess.GetLength(handle);