public void ThrowsArgumentNullExceptionForNullBuffers()
{
using (SafeFileHandle handle = File.OpenHandle(GetTestFilePath(), FileMode.CreateNew, FileAccess.Write))
{
AssertExtensions.Throws <ArgumentNullException>("buffers", () => RandomAccess.Read(handle, buffers: null, 0));
}
}
public void ThrowsOnWriteAccess()
{
using (SafeFileHandle handle = GetHandleToExistingFile(FileAccess.Write))
{
Assert.Throws <UnauthorizedAccessException>(() => RandomAccess.Read(handle, new Memory <byte>[] { new byte[1] }, 0));
}
}
public void ThrowsArgumentNullExceptionForNullBuffers(FileOptions options)
{
using (SafeFileHandle handle = GetHandleToExistingFile(FileAccess.Read, options))
{
AssertExtensions.Throws <ArgumentNullException>("buffers", () => RandomAccess.Read(handle, buffers: null, 0));
}
}
public void ReadsBytesFromGivenFileAtGivenOffset(FileOptions options)
{
const int fileSize = 4_001;
string filePath = GetTestFilePath();
byte[] expected = RandomNumberGenerator.GetBytes(fileSize);
File.WriteAllBytes(filePath, expected);
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.Open, options: options))
{
byte[] actual = new byte[fileSize + 1];
int current = 0;
int total = 0;
do
{
Span <byte> buffer = actual.AsSpan(total, Math.Min(actual.Length - total, fileSize / 4));
current = RandomAccess.Read(handle, buffer, fileOffset: total);
Assert.InRange(current, 0, buffer.Length);
total += current;
} while (current != 0);
Assert.Equal(fileSize, total);
Assert.Equal(expected, actual.Take(total).ToArray());
}
}
public void ShouldReuseBuffer()
{
var ra = new RandomAccess(new byte[] { 1, 2, 3, 4 });
ra.Byte();
var read = ra.Read(3);
Assert.AreEqual(3, read.Length);
Assert.AreEqual(0, read.Position);
Assert.AreEqual(2, read.Byte());
Assert.AreEqual(3, read.Byte());
Assert.AreEqual(4, read.Byte());
read.JumpAbsolute(0);
Assert.AreEqual(2, read.Byte());
read.JumpRelative(1);
Assert.AreEqual(4, read.Byte());
read.JumpAbsolute(1);
var read2 = read.Read(2);
Assert.AreEqual(2, read2.Length);
Assert.AreEqual(0, read2.Position);
Assert.AreEqual(3, read2.Byte());
Assert.AreEqual(4, read2.Byte());
}
public async Task ReadUsingSingleBuffer(bool asyncOperation, bool asyncHandle)
{
const int fileSize = 1_000_000; // 1 MB
string filePath = GetTestFilePath();
byte[] expected = RandomNumberGenerator.GetBytes(fileSize);
File.WriteAllBytes(filePath, expected);
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.Open, options: GetFileOptions(asyncHandle)))
using (SectorAlignedMemory <byte> buffer = SectorAlignedMemory <byte> .Allocate(Environment.SystemPageSize))
{
int current = 0;
int total = 0;
do
{
current = asyncOperation
? await RandomAccess.ReadAsync(handle, buffer.Memory, fileOffset : total)
: RandomAccess.Read(handle, buffer.GetSpan(), fileOffset: total);
Assert.True(expected.AsSpan(total, current).SequenceEqual(buffer.GetSpan().Slice(0, current)));
total += current;
}while (current != 0);
Assert.Equal(fileSize, total);
}
}
static async Task Validate(SafeFileHandle handle, FileOptions options, bool[] syncWrites, bool[] syncReads)
{
byte[] writeBuffer = new byte[1];
byte[] readBuffer = new byte[2];
long fileOffset = 0;
foreach (bool syncWrite in syncWrites)
{
foreach (bool syncRead in syncReads)
{
writeBuffer[0] = (byte)fileOffset;
if (syncWrite)
{
RandomAccess.Write(handle, writeBuffer, fileOffset);
}
else
{
await RandomAccess.WriteAsync(handle, writeBuffer, fileOffset);
}
Assert.Equal(writeBuffer.Length, syncRead ? RandomAccess.Read(handle, readBuffer, fileOffset) : await RandomAccess.ReadAsync(handle, readBuffer, fileOffset));
Assert.Equal(writeBuffer[0], readBuffer[0]);
fileOffset += 1;
}
}
}
public void ThrowsOnWriteAccess(FileOptions options)
{
using (SafeFileHandle handle = GetHandleToExistingFile(FileAccess.Write, options))
{
Assert.Throws <UnauthorizedAccessException>(() => RandomAccess.Read(handle, new byte[1], 0));
}
}
public TpsHeader(RandomAccess rx)
{
Data = rx ?? throw new ArgumentNullException(nameof(rx));
Address = rx.LongLE();
if (Address != 0)
{
throw new NotATopSpeedFileException("File does not start with 0x00000000. It is not a TopSpeed file or it may be encrypted.");
}
HeaderSize = rx.ShortLE();
var header = rx.Read(HeaderSize - 6);
FileLength1 = header.LongLE();
FileLength2 = header.LongLE();
MagicNumber = header.FixedLengthString(4);
Zeroes = header.ShortLE();
LastIssuedRow = header.LongBE();
Changes = header.LongLE();
ManagementPageReference = header.ToFileOffset(header.LongLE());
PageStart = header.ToFileOffset(header.LongArrayLE((0x110 - 0x20) / 4));
PageEnd = header.ToFileOffset(header.LongArrayLE((0x200 - 0x110) / 4));
}
public void ShouldFailBeyondBuffer()
{
var ra = new RandomAccess(new byte[] { 1, 2, 3, 4 });
ra.Byte();
var read = ra.Read(3);
Assert.Throws <IndexOutOfRangeException>(() => read.LongLE());
}
public void ShouldFailBeforeBuffer()
{
var ra = new RandomAccess(new byte[] { 1, 2, 3, 4 });
ra.Byte();
var read = ra.Read(3);
read.JumpAbsolute(-1);
Assert.Throws <IndexOutOfRangeException>(() => read.Byte());
}
/// <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 ZeroesTheFileContentsWhenExtendingTheFile(FileOptions options)
{
using (SafeFileHandle handle = File.OpenHandle(GetTestFilePath(), FileMode.CreateNew, FileAccess.Write, options: options))
{
RandomAccess.SetLength(handle, FileSize);
byte[] buffer = new byte[FileSize + 1];
Assert.Equal(FileSize, RandomAccess.Read(handle, buffer, 0));
Assert.All(buffer, @byte => Assert.Equal(0, @byte));
}
}
private void ReadFileTable(SafeFileHandle handle)
{
// Read the 12 byte footer at the end of the file
Span <byte> fileFooter = stackalloc byte[12];
if (RandomAccess.Read(_fileHandle, fileFooter, _fileLength - fileFooter.Length) < fileFooter.Length)
{
throw new InvalidDataException("Couldn't read file footer");
}
var signature = BitConverter.ToUInt32(fileFooter[..4]);
public void ReadToAnEmptyBufferReturnsZero()
{
string filePath = GetTestFilePath();
File.WriteAllBytes(filePath, new byte[1]);
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.Open))
{
Assert.Equal(0, RandomAccess.Read(handle, new Memory <byte>[] { Array.Empty <byte>() }, fileOffset: 0));
}
}
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 CanUseStackAllocatedMemory(FileOptions options)
{
string filePath = GetTestFilePath();
File.WriteAllBytes(filePath, new byte[1] {
3
});
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.Open, options: options))
{
Span <byte> stackAllocated = stackalloc byte[2];
Assert.Equal(1, RandomAccess.Read(handle, stackAllocated, fileOffset: 0));
Assert.Equal(3, stackAllocated[0]);
}
}
public void ReadToTheSameBufferOverwritesContent()
{
string filePath = GetTestFilePath();
File.WriteAllBytes(filePath, new byte[3] {
1, 2, 3
});
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.Open))
{
byte[] buffer = new byte[1];
Assert.Equal(buffer.Length + buffer.Length, RandomAccess.Read(handle, Enumerable.Repeat(buffer.AsMemory(), 2).ToList(), fileOffset: 0));
Assert.Equal(2, buffer[0]);
}
}
/// <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));
}
}
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);
}
/// <summary>
/// Creates a new <see cref="TpsRecord"/>. This is typically done on the first of a list.
/// </summary>
/// <param name="rx">The data to read from.</param>
public TpsRecord(RandomAccess rx)
{
if (rx == null)
{
throw new ArgumentNullException(nameof(rx));
}
Flags = rx.Byte();
if ((Flags & 0xC0) != 0xC0)
{
throw new ArgumentException($"Cannot construct a TpsRecord without record lengths (0x{rx.ToHex2(Flags)})");
}
RecordLength = rx.ShortLE();
HeaderLength = rx.ShortLE();
Data = rx.Read(RecordLength);
BuildHeader();
}
public TpsPage(RandomAccess rx)
{
if (rx == null)
{
throw new ArgumentNullException(nameof(rx));
}
Records = new List <TpsRecord>();
Address = rx.LongLE();
Size = rx.ShortLE();
var header = rx.Read(Size - 6);
SizeUncompressed = header.ShortLE();
SizeUncompressedWithoutHeader = header.ShortLE();
RecordCount = header.ShortLE();
Flags = header.Byte();
CompressedData = header.Read(Size - 13);
}
public void ReadsBytesFromGivenFileAtGivenOffset()
{
const int fileSize = 4_001;
string filePath = GetTestFilePath();
byte[] expected = RandomNumberGenerator.GetBytes(fileSize);
File.WriteAllBytes(filePath, expected);
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.Open))
{
byte[] actual = new byte[fileSize + 1];
long current = 0;
long total = 0;
do
{
int firstBufferLength = (int)Math.Min(actual.Length - total, fileSize / 4);
Memory <byte> buffer_1 = actual.AsMemory((int)total, firstBufferLength);
Memory <byte> buffer_2 = actual.AsMemory((int)total + firstBufferLength);
current = RandomAccess.Read(
handle,
new Memory <byte>[]
{
buffer_1,
Array.Empty <byte>(),
buffer_2
},
fileOffset: total);
Assert.InRange(current, 0, buffer_1.Length + buffer_2.Length);
total += current;
} while (current != 0);
Assert.Equal(fileSize, total);
Assert.Equal(expected, actual.Take((int)total).ToArray());
}
}
public async Task ReadAsyncUsingMultipleBuffers(bool asyncOperation, bool asyncHandle)
{
const int fileSize = 1_000_000; // 1 MB
string filePath = GetTestFilePath();
byte[] expected = RandomNumberGenerator.GetBytes(fileSize);
File.WriteAllBytes(filePath, expected);
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.Open, options: GetFileOptions(asyncHandle)))
using (SectorAlignedMemory <byte> buffer_1 = SectorAlignedMemory <byte> .Allocate(Environment.SystemPageSize))
using (SectorAlignedMemory <byte> buffer_2 = SectorAlignedMemory <byte> .Allocate(Environment.SystemPageSize))
{
long current = 0;
long total = 0;
IReadOnlyList <Memory <byte> > buffers = new Memory <byte>[]
{
buffer_1.Memory,
buffer_2.Memory,
};
do
{
current = asyncOperation
? await RandomAccess.ReadAsync(handle, buffers, fileOffset : total)
: RandomAccess.Read(handle, buffers, fileOffset: total);
int takeFromFirst = Math.Min(buffer_1.Memory.Length, (int)current);
Assert.True(expected.AsSpan((int)total, takeFromFirst).SequenceEqual(buffer_1.GetSpan().Slice(0, takeFromFirst)));
int takeFromSecond = (int)current - takeFromFirst;
Assert.True(expected.AsSpan((int)total + takeFromFirst, takeFromSecond).SequenceEqual(buffer_2.GetSpan().Slice(0, takeFromSecond)));
total += current;
} while (current == buffer_1.Memory.Length + buffer_2.Memory.Length);
Assert.Equal(fileSize, total);
}
}
public async Task ReadUsingSingleBuffer(bool async)
{
const int fileSize = 1_000_000; // 1 MB
string filePath = GetTestFilePath();
byte[] expected = RandomNumberGenerator.GetBytes(fileSize);
File.WriteAllBytes(filePath, expected);
using (SafeFileHandle handle = File.OpenHandle(filePath, FileMode.Open,
options: FileOptions.Asynchronous | NoBuffering)) // to use Scatter&Gather APIs on Windows the handle MUST be opened for async IO
using (SectorAlignedMemory <byte> buffer = SectorAlignedMemory <byte> .Allocate(Environment.SystemPageSize))
{
int current = 0;
int total = 0;
// From https://docs.microsoft.com/en-us/windows/win32/fileio/file-buffering:
// "File access sizes, including the optional file offset in the OVERLAPPED structure,
// if specified, must be for a number of bytes that is an integer multiple of the volume sector size."
// So if buffer and physical sector size is 4096 and the file size is 4097:
// the read from offset=0 reads 4096 bytes
// the read from offset=4096 reads 1 byte
// the read from offset=4097 THROWS (Invalid argument, offset is not a multiple of sector size!)
// That is why we stop at the first incomplete read (the next one would throw).
// It's possible to get 0 if we are lucky and file size is a multiple of physical sector size.
do
{
current = async
? await RandomAccess.ReadAsync(handle, buffer.Memory, fileOffset : total)
: RandomAccess.Read(handle, buffer.GetSpan(), fileOffset: total);
Assert.True(expected.AsSpan(total, current).SequenceEqual(buffer.GetSpan().Slice(0, current)));
total += current;
}while (current == buffer.Memory.Length);
Assert.Equal(fileSize, total);
}
}
public uint HashFileLocationsUsingRandomAccessCrc32()
{
SafeFileHandle handle = File.OpenHandle(FilePath, FileMode.Open);
byte[] buffer = new byte[1024 * 1024 * 2];
uint hash1 = 0;
uint hash2 = 0;
uint hash3 = 0;
for (int i = 0; i < 10; i++)
{
RandomAccess.Read(handle, buffer, 0);
hash1 = HashUtils.CRC32(buffer);
RandomAccess.Read(handle, buffer, Count / 2);
hash2 = HashUtils.CRC32(buffer);
RandomAccess.Read(handle, buffer, Count - 1024 * 1024 * 2);
hash3 = HashUtils.CRC32(buffer);
}
return((uint)HashCode.Combine(hash1, hash2, hash3));
}
protected override long MethodUnderTest(SafeFileHandle handle, byte[] bytes, long fileOffset)
=> RandomAccess.Read(handle, new Memory <byte>[] { bytes }, fileOffset);
protected override int MethodUnderTest(SafeFileHandle handle, byte[] bytes, long fileOffset) => RandomAccess.Read(handle, bytes, fileOffset);