public unsafe void Write(SafeBuffer buffer)
{
if (buffer is null)
{
ExceptionUtil.ThrowArgumentNullException(nameof(buffer));
}
VerifyNotDisposed();
ulong length = buffer.ByteLength;
if (length == 0)
{
return;
}
// The largest multiple of 4096 that is under the large object heap limit.
const int MaxBufferSize = 81920;
int bufferSize = (int)Math.Min(length, MaxBufferSize);
byte[] writeBuffer = this.arrayPool.Rent(bufferSize);
byte *readPtr = null;
System.Runtime.CompilerServices.RuntimeHelpers.PrepareConstrainedRegions();
try
{
buffer.AcquirePointer(ref readPtr);
fixed(byte *writePtr = writeBuffer)
{
ulong totalBytesRead = 0;
while (totalBytesRead < length)
{
ulong bytesRead = Math.Min(length - totalBytesRead, MaxBufferSize);
Buffer.MemoryCopy(readPtr + totalBytesRead, writePtr, bytesRead, bytesRead);
this.stream.Write(writeBuffer, 0, (int)bytesRead);
totalBytesRead += bytesRead;
}
}
}
finally
{
if (readPtr != null)
{
buffer.ReleasePointer();
}
}
this.arrayPool.Return(writeBuffer);
}
/// <summary>
/// Subclasses must call this method (or the other overload) to properly initialize all instance fields.
/// </summary>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="length"></param>
/// <param name="access"></param>
protected void Initialize(SafeBuffer buffer, long offset, long length, FileAccess access)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset), SR.ArgumentOutOfRange_NeedNonNegNum);
}
if (length < 0)
{
throw new ArgumentOutOfRangeException(nameof(length), SR.ArgumentOutOfRange_NeedNonNegNum);
}
if (buffer.ByteLength < (ulong)(offset + length))
{
throw new ArgumentException(SR.Argument_InvalidSafeBufferOffLen);
}
if (access < FileAccess.Read || access > FileAccess.ReadWrite)
{
throw new ArgumentOutOfRangeException(nameof(access));
}
if (_isOpen)
{
throw new InvalidOperationException(SR.InvalidOperation_CalledTwice);
}
// check for wraparound
unsafe
{
byte *pointer = null;
try
{
buffer.AcquirePointer(ref pointer);
if ((pointer + offset + length) < pointer)
{
throw new ArgumentException(SR.ArgumentOutOfRange_UnmanagedMemStreamWrapAround);
}
}
finally
{
if (pointer != null)
{
buffer.ReleasePointer();
}
}
}
_offset = offset;
_buffer = buffer;
_length = length;
_capacity = length;
_access = access;
_isOpen = true;
}
internal unsafe void Initialize(SafeBuffer buffer, long offset, long length, FileAccess access, bool skipSecurityCheck)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (offset < 0L)
{
throw new ArgumentOutOfRangeException("offset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (length < 0L)
{
throw new ArgumentOutOfRangeException("length", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (buffer.ByteLength < (offset + length))
{
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidSafeBufferOffLen"));
}
if ((access < FileAccess.Read) || (access > FileAccess.ReadWrite))
{
throw new ArgumentOutOfRangeException("access");
}
if (this._isOpen)
{
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_CalledTwice"));
}
if (!skipSecurityCheck)
{
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();
}
byte *pointer = null;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
buffer.AcquirePointer(ref pointer);
if (((pointer + offset) + length) < pointer)
{
throw new ArgumentException(Environment.GetResourceString("ArgumentOutOfRange_UnmanagedMemStreamWrapAround"));
}
}
finally
{
if (pointer != null)
{
buffer.ReleasePointer();
}
}
this._offset = offset;
this._buffer = buffer;
this._length = length;
this._capacity = length;
this._access = access;
this._isOpen = true;
}
protected void Initialize(SafeBuffer buffer, long offset, long length, FileAccess access)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset), Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (length < 0)
{
throw new ArgumentOutOfRangeException(nameof(length), Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (buffer.ByteLength < (ulong)(offset + length))
{
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidSafeBufferOffLen"));
}
if (access < FileAccess.Read || access > FileAccess.ReadWrite)
{
throw new ArgumentOutOfRangeException(nameof(access));
}
Contract.EndContractBlock();
if (_isOpen)
{
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_CalledTwice"));
}
// check for wraparound
unsafe {
byte *pointer = null;
RuntimeHelpers.PrepareConstrainedRegions();
try {
buffer.AcquirePointer(ref pointer);
if ((pointer + offset + length) < pointer)
{
throw new ArgumentException(Environment.GetResourceString("ArgumentOutOfRange_UnmanagedMemStreamWrapAround"));
}
}
finally {
if (pointer != null)
{
buffer.ReleasePointer();
}
}
}
_offset = offset;
_buffer = buffer;
_length = length;
_capacity = length;
_access = access;
_isOpen = true;
}
#pragma warning restore 618
protected void Initialize(SafeBuffer buffer, Int64 offset, Int64 capacity, FileAccess access)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException("offset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (capacity < 0)
{
throw new ArgumentOutOfRangeException("capacity", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (buffer.ByteLength < (UInt64)(offset + capacity))
{
throw new ArgumentException(Environment.GetResourceString("Argument_OffsetAndCapacityOutOfBounds"));
}
if (access < FileAccess.Read || access > FileAccess.ReadWrite)
{
throw new ArgumentOutOfRangeException("access");
}
Contract.EndContractBlock();
if (_isOpen)
{
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_CalledTwice"));
}
unsafe {
byte *pointer = null;
RuntimeHelpers.PrepareConstrainedRegions();
try {
buffer.AcquirePointer(ref pointer);
if (((byte *)((Int64)pointer + offset + capacity)) < pointer)
{
throw new ArgumentException(Environment.GetResourceString("Argument_UnmanagedMemAccessorWrapAround"));
}
}
finally {
if (pointer != null)
{
buffer.ReleasePointer();
}
}
}
_offset = offset;
_buffer = buffer;
_capacity = capacity;
_access = access;
_isOpen = true;
_canRead = (_access & FileAccess.Read) != 0;
_canWrite = (_access & FileAccess.Write) != 0;
}
protected void Initialize(SafeBuffer buffer, long offset, long capacity, FileAccess access)
{
ArgumentNullException.ThrowIfNull(buffer);
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset), SR.ArgumentOutOfRange_NeedNonNegNum);
}
if (capacity < 0)
{
throw new ArgumentOutOfRangeException(nameof(capacity), SR.ArgumentOutOfRange_NeedNonNegNum);
}
if (buffer.ByteLength < (ulong)(offset + capacity))
{
throw new ArgumentException(SR.Argument_OffsetAndCapacityOutOfBounds);
}
if (access < FileAccess.Read || access > FileAccess.ReadWrite)
{
throw new ArgumentOutOfRangeException(nameof(access));
}
if (_isOpen)
{
throw new InvalidOperationException(SR.InvalidOperation_CalledTwice);
}
unsafe
{
byte *pointer = null;
try
{
buffer.AcquirePointer(ref pointer);
if (((byte *)((long)pointer + offset + capacity)) < pointer)
{
throw new ArgumentException(SR.Argument_UnmanagedMemAccessorWrapAround);
}
}
finally
{
if (pointer != null)
{
buffer.ReleasePointer();
}
}
}
_offset = offset;
_buffer = buffer;
_capacity = capacity;
_access = access;
_isOpen = true;
_canRead = (_access & FileAccess.Read) != 0;
_canWrite = (_access & FileAccess.Write) != 0;
}
/// <summary>
/// Reads the specified number of bytes from the stream, starting from a specified point in the SafeBuffer.
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="offset">The starting offset in the buffer.</param>
/// <param name="count">The count.</param>
/// <exception cref="ArgumentNullException"><paramref name="buffer"/> is null.</exception>
/// <exception cref="EndOfStreamException">The end of the stream has been reached.</exception>
/// <exception cref="ObjectDisposedException">The object has been disposed.</exception>
public unsafe void ProperRead(SafeBuffer buffer, ulong offset, ulong count)
{
if (buffer is null)
{
ExceptionUtil.ThrowArgumentNullException(nameof(buffer));
}
VerifyNotDisposed();
if (count == 0)
{
return;
}
// The largest multiple of 4096 that is under the large object heap limit.
const int MaxReadBufferSize = 81920;
byte[] readBuffer = this.arrayPool.Rent((int)Math.Min(count, MaxReadBufferSize));
byte *writePtr = null;
System.Runtime.CompilerServices.RuntimeHelpers.PrepareConstrainedRegions();
try
{
buffer.AcquirePointer(ref writePtr);
fixed(byte *readPtr = readBuffer)
{
ulong totalBytesRead = 0;
while (totalBytesRead < count)
{
ulong bytesRead = (ulong)ReadInternal(readBuffer, 0, (int)Math.Min(count - totalBytesRead, MaxReadBufferSize));
if (bytesRead == 0)
{
throw new EndOfStreamException();
}
Buffer.MemoryCopy(readPtr, writePtr + offset + totalBytesRead, bytesRead, bytesRead);
totalBytesRead += bytesRead;
}
}
}
finally
{
if (writePtr != null)
{
buffer.ReleasePointer();
}
}
this.arrayPool.Return(readBuffer);
}
private SafeBufferPointer(SafeBuffer buffer)
{
this.buffer = buffer;
unsafe
{
byte *p = null;
buffer.AcquirePointer(ref p);
Pointer = new IntPtr(p);
}
}
public StreamHeaderRef(MemoryMappedViewAccessor accessor)
{
Accessor = accessor;
Buffer = accessor.GetSafeBuffer();
byte *temp = null;
Buffer.AcquirePointer(ref temp);
Ptr = (StreamHeader *)temp;
}
internal static unsafe byte *AcquirePointer(object accessor, out SafeBuffer safeBuffer)
{
var memoryMappedViewAccessor = (MemoryMappedViewAccessor)accessor;
safeBuffer = memoryMappedViewAccessor.SafeMemoryMappedViewHandle;
byte *ptr = null;
safeBuffer.AcquirePointer(ref ptr);
return(ptr + memoryMappedViewAccessor.PointerOffset);
}
public CacheEntry(MemoryMappedViewAccessor view, long offset, uint size)
{
CreatedWhen = Time.Ticks;
View = view;
Offset = offset;
Size = size;
IsDisposed = false;
_RefCount = 1;
Buffer = view.GetSafeBuffer();
Pointer = null;
Buffer.AcquirePointer(ref Pointer);
PointerOffset = view.GetPointerOffset();
}
protected unsafe void Initialize(SafeBuffer buffer, long offset, long capacity, FileAccess access)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (offset < 0L)
{
throw new ArgumentOutOfRangeException("offset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (capacity < 0L)
{
throw new ArgumentOutOfRangeException("capacity", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (buffer.ByteLength < (offset + capacity))
{
throw new ArgumentException(Environment.GetResourceString("Argument_OffsetAndCapacityOutOfBounds"));
}
if ((access < FileAccess.Read) || (access > FileAccess.ReadWrite))
{
throw new ArgumentOutOfRangeException("access");
}
if (this._isOpen)
{
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_CalledTwice"));
}
byte* pointer = null;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
buffer.AcquirePointer(ref pointer);
if (((IntPtr) ((((ulong) pointer) + offset) + ((ulong) capacity))) < pointer)
{
throw new ArgumentException(Environment.GetResourceString("Argument_UnmanagedMemAccessorWrapAround"));
}
}
finally
{
if (pointer != null)
{
buffer.ReleasePointer();
}
}
this._offset = offset;
this._buffer = buffer;
this._capacity = capacity;
this._access = access;
this._isOpen = true;
this._canRead = (this._access & FileAccess.Read) != 0;
this._canWrite = (this._access & FileAccess.Write) != 0;
}
internal unsafe static byte *AcquirePointer(object accessor, out SafeBuffer safeBuffer)
{
Debug.Assert(s_lazyIsAvailable.GetValueOrDefault());
safeBuffer = (SafeBuffer)s_lazySafeMemoryMappedViewHandle.GetValue(accessor);
byte *ptr = null;
safeBuffer.AcquirePointer(ref ptr);
long offset = (long)s_lazyPointerOffset.GetValue(accessor);
return(ptr + offset);
}
public override void ReadBytes(Span <byte> dest, long offset)
{
CheckOffsets(offset, dest.Length);
byte *pointer = null;
mBuffer.AcquirePointer(ref pointer);
try
{
new ReadOnlySpan <byte>(pointer + offset, dest.Length).CopyTo(dest);
}
finally
{
mBuffer.ReleasePointer();
}
}
public static unsafe byte *DangerousGetPointer(this SafeBuffer buffer)
{
byte *pointer = null;
RuntimeHelpers.PrepareConstrainedRegions();
try {
buffer.AcquirePointer(ref pointer);
} finally {
if (pointer != null)
{
buffer.ReleasePointer();
}
}
return(pointer);
}
public StreamRange(StreamRef stream, MemoryMappedViewAccessor view, long offset, uint size, long actualOffset, long actualSize)
{
Stream = stream;
View = view;
CacheEntry = default(ViewCache.CacheEntry);
Offset = offset;
Size = size;
Buffer = view.GetSafeBuffer();
Pointer = null;
Buffer.AcquirePointer(ref Pointer);
IsDisposed = false;
unchecked {
Pointer += view.GetPointerOffset();
Pointer += (offset - actualOffset);
}
}
public DisposableData(IDisposable accessor, SafeBuffer safeBuffer, long offset)
{
#if FEATURE_CER
// Make sure the current thread isn't aborted in between acquiring the pointer and assigning the fields.
RuntimeHelpers.PrepareConstrainedRegions();
try
{ /* intentionally left blank */ }
finally
#endif
{
byte *basePointer = null;
safeBuffer.AcquirePointer(ref basePointer);
_accessor = accessor;
_safeBuffer = safeBuffer;
_pointer = basePointer + offset;
}
}
public DisposableData(IDisposable accessor, SafeBuffer safeBuffer, long offset)
{
// Make sure the current thread isn't aborted in between acquiring the pointer and assigning the fields.
#if !NETSTANDARD11
RuntimeHelpers.PrepareConstrainedRegions();
#endif
try
{
}
finally
{
byte *basePointer = null;
safeBuffer.AcquirePointer(ref basePointer);
_accessor = accessor;
_safeBuffer = safeBuffer;
_pointer = basePointer + offset;
}
}
public Segment Init(Message message, SafeBuffer safeBuffer)
{
if (this.Message != null)
{
throw new InvalidOperationException("Segment already initialized");
}
if (safeBuffer.ByteLength % 8 != 0)
{
throw new ArgumentException("Memory length must be a multiple of 8 bytes");
}
this.Message = message;
_byteLength = (int)safeBuffer.ByteLength;
_fixedMemHandle = safeBuffer;
unsafe
{
byte *ptr = null;
try
{
// TODO: can we just use DangerousGetHandle?
safeBuffer.AcquirePointer(ref ptr);
_disposer = new SafeBufferReleaser(safeBuffer);
_fixedMemPointer = new IntPtr(ptr);
return(this);
}
finally
{
if (ptr != null)
{
if (_disposer == null)
{
_disposer.Dispose();
}
else
{
safeBuffer.ReleasePointer();
}
}
}
}
}
internal unsafe static byte *AcquirePointer(object accessor, out SafeBuffer safeBuffer)
{
Debug.Assert(s_lazyIsAvailable.GetValueOrDefault());
safeBuffer = (SafeBuffer)s_lazySafeMemoryMappedViewHandle.GetValue(accessor);
byte *ptr = null;
safeBuffer.AcquirePointer(ref ptr);
try
{
long offset;
if (s_lazyPointerOffset != null)
{
offset = (long)s_lazyPointerOffset.GetValue(accessor);
}
else
{
object internalView = s_lazyInternalViewField.GetValue(accessor);
offset = (long)s_lazyInternalPointerOffset.GetValue(internalView);
}
return(ptr + offset);
}
catch (MemberAccessException)
{
s_lazyIsAvailable = false;
return(null);
}
catch (InvalidOperationException)
{
// thrown when accessing unapproved API in a Windows Store app
s_lazyIsAvailable = false;
return(null);
}
catch (TargetInvocationException ex)
{
ExceptionDispatchInfo.Capture(ex.InnerException).Throw();
throw;
}
}
protected MemoryMappedBitmap(int width, int height, int stride, string mapName)
{
this.width = width;
this.height = height;
this.stride = stride;
int totalBytes = height * stride;
Debug.Assert(totalBytes == this.TotalBytes);
Interlocked.Add(ref aggregatedTotalBytes, totalBytes);
// TODO: security - restrict access to only our process and child processes
backingName = mapName;
backing = MemoryMappedFile.CreateOrOpen(mapName, totalBytes);
accessor = backing.CreateViewAccessor();
FieldInfo field = typeof(UnmanagedMemoryAccessor).GetField("_buffer", BindingFlags.NonPublic | BindingFlags.Instance);
buffer = (SafeBuffer)field.GetValue(accessor);
buffer.AcquirePointer(ref scan0);
}
internal unsafe static byte *AcquirePointer(object accessor, out SafeBuffer safeBuffer)
{
Debug.Assert(lazyIsAvailable.GetValueOrDefault());
safeBuffer = (SafeBuffer)lazySafeMemoryMappedViewHandle.GetValue(accessor);
byte *ptr = null;
safeBuffer.AcquirePointer(ref ptr);
long offset;
if (lazyPointerOffset != null)
{
offset = (long)lazyPointerOffset.GetValue(accessor);
}
else
{
object internalView = lazyInternalViewField.GetValue(accessor);
offset = (long)lazyInternalPointerOffset.GetValue(internalView);
}
return(ptr + offset);
}
[System.Security.SecuritySafeCritical] // auto-generated
public override int Read([In, Out] byte[] buffer, int offset, int count)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer", Environment.GetResourceString("ArgumentNull_Buffer"));
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException("offset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (count < 0)
{
throw new ArgumentOutOfRangeException("count", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (buffer.Length - offset < count)
{
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen"));
}
Contract.EndContractBlock(); // Keep this in [....] with contract validation in ReadAsync
if (!_isOpen)
{
__Error.StreamIsClosed();
}
if (!CanRead)
{
__Error.ReadNotSupported();
}
// Use a local variable to avoid a race where another thread
// changes our position after we decide we can read some bytes.
long pos = Interlocked.Read(ref _position);
long len = Interlocked.Read(ref _length);
long n = len - pos;
if (n > count)
{
n = count;
}
if (n <= 0)
{
return(0);
}
int nInt = (int)n; // Safe because n <= count, which is an Int32
if (nInt < 0)
{
nInt = 0; // _position could be beyond EOF
}
Contract.Assert(pos + nInt >= 0, "_position + n >= 0"); // len is less than 2^63 -1.
if (_buffer != null)
{
unsafe {
byte *pointer = null;
RuntimeHelpers.PrepareConstrainedRegions();
try {
_buffer.AcquirePointer(ref pointer);
Buffer.Memcpy(buffer, offset, pointer + pos + _offset, 0, nInt);
}
finally {
if (pointer != null)
{
_buffer.ReleasePointer();
}
}
}
}
else
{
unsafe {
Buffer.Memcpy(buffer, offset, _mem + pos, 0, nInt);
}
}
Interlocked.Exchange(ref _position, pos + n);
return(nInt);
}
internal int ReadCore(Span <byte> destination)
{
if (!_isOpen)
{
throw Error.GetStreamIsClosed();
}
if (!CanRead)
{
throw Error.GetReadNotSupported();
}
// Use a local variable to avoid a race where another thread
// changes our position after we decide we can read some bytes.
long pos = Interlocked.Read(ref _position);
long len = Interlocked.Read(ref _length);
long n = Math.Min(len - pos, destination.Length);
if (n <= 0)
{
return(0);
}
int nInt = (int)n; // Safe because n <= count, which is an Int32
if (nInt < 0)
{
return(0); // _position could be beyond EOF
}
Debug.Assert(pos + nInt >= 0, "_position + n >= 0"); // len is less than 2^63 -1.
unsafe
{
fixed(byte *pBuffer = &destination.DangerousGetPinnableReference())
{
if (_buffer != null)
{
byte *pointer = null;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
_buffer.AcquirePointer(ref pointer);
Buffer.Memcpy(pBuffer, pointer + pos + _offset, nInt);
}
finally
{
if (pointer != null)
{
_buffer.ReleasePointer();
}
}
}
else
{
Buffer.Memcpy(pBuffer, _mem + pos, nInt);
}
}
}
Interlocked.Exchange(ref _position, pos + n);
return(nInt);
}
[System.Security.SecurityCritical] // auto-generated
internal void Initialize(SafeBuffer buffer, long offset, long length, FileAccess access, bool skipSecurityCheck)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException("offset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (length < 0)
{
throw new ArgumentOutOfRangeException("length", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
}
if (buffer.ByteLength < (ulong)(offset + length))
{
throw new ArgumentException(Environment.GetResourceString("Argument_InvalidSafeBufferOffLen"));
}
if (access < FileAccess.Read || access > FileAccess.ReadWrite)
{
throw new ArgumentOutOfRangeException("access");
}
Contract.EndContractBlock();
if (_isOpen)
{
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_CalledTwice"));
}
#if FEATURE_MONO_CAS
if (!skipSecurityCheck)
{
#pragma warning disable 618
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();
#pragma warning restore 618
}
#endif
// check for wraparound
unsafe {
byte *pointer = null;
RuntimeHelpers.PrepareConstrainedRegions();
try {
buffer.AcquirePointer(ref pointer);
if ((pointer + offset + length) < pointer)
{
throw new ArgumentException(Environment.GetResourceString("ArgumentOutOfRange_UnmanagedMemStreamWrapAround"));
}
}
finally {
if (pointer != null)
{
buffer.ReleasePointer();
}
}
}
_offset = offset;
_buffer = buffer;
_length = length;
_capacity = length;
_access = access;
_isOpen = true;
}
[System.Security.SecuritySafeCritical] // auto-generated
public char ReadChar(Int64 position)
{
int sizeOfType = sizeof(char);
EnsureSafeToRead(position, sizeOfType);
char result;
unsafe
{
byte *pointer = null;
try
{
_buffer.AcquirePointer(ref pointer);
pointer += (_offset + position);
// check if pointer is aligned
if (((int)pointer & (sizeOfType - 1)) == 0)
{
result = *((char *)(pointer));
}
else
{
result = (char)(*pointer | *(pointer + 1) << 8);
}
}
finally
{
if (pointer != null)
{
_buffer.ReleasePointer();
}
}
}
return(result);
}
[System.Security.SecuritySafeCritical] // auto-generated
public override int Read([In, Out] byte[] buffer, int offset, int count)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer), SR.ArgumentNull_Buffer);
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset), SR.ArgumentOutOfRange_NeedNonNegNum);
}
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count), SR.ArgumentOutOfRange_NeedNonNegNum);
}
if (buffer.Length - offset < count)
{
throw new ArgumentException(SR.Argument_InvalidOffLen);
}
Contract.EndContractBlock(); // Keep this in sync with contract validation in ReadAsync
if (!_isOpen)
{
throw Error.GetStreamIsClosed();
}
if (!CanRead)
{
throw Error.GetReadNotSupported();
}
// Use a local variable to avoid a race where another thread
// changes our position after we decide we can read some bytes.
long pos = Interlocked.Read(ref _position);
long len = Interlocked.Read(ref _length);
long n = len - pos;
if (n > count)
{
n = count;
}
if (n <= 0)
{
return(0);
}
int nInt = (int)n; // Safe because n <= count, which is an Int32
if (nInt < 0)
{
return(0); // _position could be beyond EOF
}
Debug.Assert(pos + nInt >= 0, "_position + n >= 0"); // len is less than 2^63 -1.
unsafe
{
fixed(byte *pBuffer = buffer)
{
if (_buffer != null)
{
byte *pointer = null;
try
{
_buffer.AcquirePointer(ref pointer);
Buffer.MemoryCopy(source: pointer + pos + _offset, destination: pBuffer + offset, destinationSizeInBytes: nInt, sourceBytesToCopy: nInt);
}
finally
{
if (pointer != null)
{
_buffer.ReleasePointer();
}
}
}
else
{
Buffer.MemoryCopy(source: _mem + pos, destination: pBuffer + offset, destinationSizeInBytes: nInt, sourceBytesToCopy: nInt);
}
}
}
Interlocked.Exchange(ref _position, pos + n);
return(nInt);
}
public static unsafe ref byte AcquirePointer(this SafeBuffer buffer)
{
byte *ptr = null;
buffer.AcquirePointer(ref ptr);
return(ref ptr[0]);
[System.Security.SecuritySafeCritical] // auto-generated
public char ReadChar(Int64 position)
{
int sizeOfType = sizeof(char);
EnsureSafeToRead(position, sizeOfType);
char result;
unsafe {
byte *pointer = null;
RuntimeHelpers.PrepareConstrainedRegions();
try {
_buffer.AcquirePointer(ref pointer);
pointer += (_offset + position);
#if ALIGN_ACCESS
// check if pointer is aligned
if (((int)pointer & (sizeOfType - 1)) == 0)
{
#endif
result = *((char *)(pointer));
#if ALIGN_ACCESS
}
else
{
result = (char)(*pointer | *(pointer + 1) << 8);
}
#endif
}
finally {
if (pointer != null)
{
_buffer.ReleasePointer();
}
}
}
return(result);
}
public char ReadChar(Int64 position)
{
EnsureSafeToRead(position, sizeof(char));
char result;
unsafe
{
byte *pointer = null;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
_buffer.AcquirePointer(ref pointer);
result = Unsafe.ReadUnaligned <char>(pointer + _offset + position);
}
finally
{
if (pointer != null)
{
_buffer.ReleasePointer();
}
}
}
return(result);
}
