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112 lines
4.0 KiB
112 lines
4.0 KiB
#Region "Copyright notice and license"
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' Protocol Buffers - Google's data interchange format
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' Copyright 2015 Google Inc. All rights reserved.
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' https://developers.google.com/protocol-buffers/
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'
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' Redistribution and use in source and binary forms, with or without
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' modification, are permitted provided that the following conditions are
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' met:
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'
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' * Redistributions of source code must retain the above copyright
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' notice, this list of conditions and the following disclaimer.
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' * Redistributions in binary form must reproduce the above
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' copyright notice, this list of conditions and the following disclaimer
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' in the documentation and/or other materials provided with the
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' distribution.
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' * Neither the name of Google Inc. nor the names of its
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' contributors may be used to endorse or promote products derived from
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' this software without specific prior written permission.
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'
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' THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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' "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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' LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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' A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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' OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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' SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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' LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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' DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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' THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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' (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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' OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#End Region
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Imports System
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Imports System.IO
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Namespace Google.Protobuf
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''' <summary>
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''' Stream implementation which proxies another stream, only allowing a certain amount
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''' of data to be read. Note that this is only used to read delimited streams, so it
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''' doesn't attempt to implement everything.
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''' </summary>
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Friend NotInheritable Class LimitedInputStream
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Inherits Stream
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Private ReadOnly proxied As Stream
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Private bytesLeft As Integer
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Friend Sub New(proxied As Stream, size As Integer)
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Me.proxied = proxied
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bytesLeft = size
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End Sub
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Public Overrides ReadOnly Property CanRead As Boolean
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Get
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Return True
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End Get
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End Property
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Public Overrides ReadOnly Property CanSeek As Boolean
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Get
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Return False
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End Get
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End Property
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Public Overrides ReadOnly Property CanWrite As Boolean
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Get
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Return False
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End Get
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End Property
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Public Overrides Sub Flush()
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End Sub
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Public Overrides ReadOnly Property Length As Long
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Get
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Throw New NotSupportedException()
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End Get
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End Property
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Public Overrides Property Position As Long
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Get
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Throw New NotSupportedException()
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End Get
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Set(value As Long)
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Throw New NotSupportedException()
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End Set
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End Property
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Public Overrides Function Read(buffer As Byte(), offset As Integer, count As Integer) As Integer
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If bytesLeft > 0 Then
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Dim bytesRead = proxied.Read(buffer, offset, Math.Min(bytesLeft, count))
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bytesLeft -= bytesRead
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Return bytesRead
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End If
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Return 0
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End Function
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Public Overrides Function Seek(offset As Long, origin As SeekOrigin) As Long
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Throw New NotSupportedException()
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End Function
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Public Overrides Sub SetLength(value As Long)
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Throw New NotSupportedException()
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End Sub
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Public Overrides Sub Write(buffer As Byte(), offset As Integer, count As Integer)
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Throw New NotSupportedException()
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End Sub
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End Class
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End Namespace
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