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@@ -1,1274 +0,0 @@
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-#region Copyright notice and license
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-// Protocol Buffers - Google's data interchange format
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-// Copyright 2008 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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-#endregion
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-
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-using Google.Protobuf.Collections;
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-using System;
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-using System.Collections.Generic;
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-using System.IO;
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-
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-namespace Google.Protobuf
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-{
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- /// <summary>
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- /// Reads and decodes protocol message fields.
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- /// </summary>
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- /// <remarks>
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- /// <para>
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- /// This class is generally used by generated code to read appropriate
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- /// primitives from the stream. It effectively encapsulates the lowest
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- /// levels of protocol buffer format.
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- /// </para>
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- /// <para>
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- /// Repeated fields and map fields are not handled by this class; use <see cref="RepeatedField{T}"/>
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- /// and <see cref="MapField{TKey, TValue}"/> to serialize such fields.
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- /// </para>
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- /// </remarks>
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- public sealed class CodedInputStream : IDisposable
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- {
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- /// <summary>
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- /// Whether to leave the underlying stream open when disposing of this stream.
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- /// This is always true when there's no stream.
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- /// </summary>
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- private readonly bool leaveOpen;
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-
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- /// <summary>
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- /// Buffer of data read from the stream or provided at construction time.
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- /// </summary>
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- private readonly byte[] buffer;
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-
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- /// <summary>
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- /// The index of the buffer at which we need to refill from the stream (if there is one).
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- /// </summary>
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- private int bufferSize;
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-
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- private int bufferSizeAfterLimit = 0;
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- /// <summary>
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- /// The position within the current buffer (i.e. the next byte to read)
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- /// </summary>
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- private int bufferPos = 0;
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-
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- /// <summary>
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- /// The stream to read further input from, or null if the byte array buffer was provided
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- /// directly on construction, with no further data available.
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- /// </summary>
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- private readonly Stream input;
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-
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- /// <summary>
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- /// The last tag we read. 0 indicates we've read to the end of the stream
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- /// (or haven't read anything yet).
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- /// </summary>
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- private uint lastTag = 0;
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-
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- /// <summary>
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- /// The next tag, used to store the value read by PeekTag.
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- /// </summary>
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- private uint nextTag = 0;
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- private bool hasNextTag = false;
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-
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- internal const int DefaultRecursionLimit = 64;
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- internal const int DefaultSizeLimit = 64 << 20; // 64MB
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- internal const int BufferSize = 4096;
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-
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- /// <summary>
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- /// The total number of bytes read before the current buffer. The
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- /// total bytes read up to the current position can be computed as
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- /// totalBytesRetired + bufferPos.
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- /// </summary>
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- private int totalBytesRetired = 0;
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-
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- /// <summary>
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- /// The absolute position of the end of the current message.
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- /// </summary>
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- private int currentLimit = int.MaxValue;
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-
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- private int recursionDepth = 0;
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-
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- private readonly int recursionLimit;
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- private readonly int sizeLimit;
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-
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- #region Construction
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- // Note that the checks are performed such that we don't end up checking obviously-valid things
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- // like non-null references for arrays we've just created.
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-
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- /// <summary>
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- /// Creates a new CodedInputStream reading data from the given byte array.
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- /// </summary>
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- public CodedInputStream(byte[] buffer) : this(null, ProtoPreconditions.CheckNotNull(buffer, "buffer"), 0, buffer.Length, true)
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- {
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- }
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-
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- /// <summary>
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- /// Creates a new <see cref="CodedInputStream"/> that reads from the given byte array slice.
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- /// </summary>
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- public CodedInputStream(byte[] buffer, int offset, int length)
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- : this(null, ProtoPreconditions.CheckNotNull(buffer, "buffer"), offset, offset + length, true)
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- {
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- if (offset < 0 || offset > buffer.Length)
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- {
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- throw new ArgumentOutOfRangeException("offset", "Offset must be within the buffer");
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- }
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- if (length < 0 || offset + length > buffer.Length)
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- {
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- throw new ArgumentOutOfRangeException("length", "Length must be non-negative and within the buffer");
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- }
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- }
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-
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- /// <summary>
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- /// Creates a new <see cref="CodedInputStream"/> reading data from the given stream, which will be disposed
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- /// when the returned object is disposed.
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- /// </summary>
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- /// <param name="input">The stream to read from.</param>
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- public CodedInputStream(Stream input) : this(input, false)
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- {
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- }
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-
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- /// <summary>
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- /// Creates a new <see cref="CodedInputStream"/> reading data from the given stream.
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- /// </summary>
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- /// <param name="input">The stream to read from.</param>
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- /// <param name="leaveOpen"><c>true</c> to leave <paramref name="input"/> open when the returned
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- /// <c cref="CodedInputStream"/> is disposed; <c>false</c> to dispose of the given stream when the
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- /// returned object is disposed.</param>
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- public CodedInputStream(Stream input, bool leaveOpen)
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- : this(ProtoPreconditions.CheckNotNull(input, "input"), new byte[BufferSize], 0, 0, leaveOpen)
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- {
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- }
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-
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- /// <summary>
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- /// Creates a new CodedInputStream reading data from the given
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- /// stream and buffer, using the default limits.
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- /// </summary>
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- internal CodedInputStream(Stream input, byte[] buffer, int bufferPos, int bufferSize, bool leaveOpen)
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- {
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- this.input = input;
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- this.buffer = buffer;
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- this.bufferPos = bufferPos;
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- this.bufferSize = bufferSize;
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- this.sizeLimit = DefaultSizeLimit;
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- this.recursionLimit = DefaultRecursionLimit;
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- this.leaveOpen = leaveOpen;
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- }
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-
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- /// <summary>
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- /// Creates a new CodedInputStream reading data from the given
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- /// stream and buffer, using the specified limits.
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- /// </summary>
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- /// <remarks>
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- /// This chains to the version with the default limits instead of vice versa to avoid
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- /// having to check that the default values are valid every time.
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- /// </remarks>
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- internal CodedInputStream(Stream input, byte[] buffer, int bufferPos, int bufferSize, int sizeLimit, int recursionLimit, bool leaveOpen)
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- : this(input, buffer, bufferPos, bufferSize, leaveOpen)
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- {
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- if (sizeLimit <= 0)
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- {
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- throw new ArgumentOutOfRangeException("sizeLimit", "Size limit must be positive");
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- }
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- if (recursionLimit <= 0)
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- {
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- throw new ArgumentOutOfRangeException("recursionLimit!", "Recursion limit must be positive");
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- }
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- this.sizeLimit = sizeLimit;
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- this.recursionLimit = recursionLimit;
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- }
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- #endregion
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-
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- /// <summary>
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- /// Creates a <see cref="CodedInputStream"/> with the specified size and recursion limits, reading
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- /// from an input stream.
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- /// </summary>
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- /// <remarks>
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- /// This method exists separately from the constructor to reduce the number of constructor overloads.
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- /// It is likely to be used considerably less frequently than the constructors, as the default limits
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- /// are suitable for most use cases.
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- /// </remarks>
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- /// <param name="input">The input stream to read from</param>
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- /// <param name="sizeLimit">The total limit of data to read from the stream.</param>
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- /// <param name="recursionLimit">The maximum recursion depth to allow while reading.</param>
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- /// <returns>A <c>CodedInputStream</c> reading from <paramref name="input"/> with the specified size
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- /// and recursion limits.</returns>
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- public static CodedInputStream CreateWithLimits(Stream input, int sizeLimit, int recursionLimit)
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- {
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- // Note: we may want an overload accepting leaveOpen
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- return new CodedInputStream(input, new byte[BufferSize], 0, 0, sizeLimit, recursionLimit, false);
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- }
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-
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- /// <summary>
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- /// Returns the current position in the input stream, or the position in the input buffer
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- /// </summary>
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- public long Position
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- {
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- get
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- {
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- if (input != null)
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- {
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- return input.Position - ((bufferSize + bufferSizeAfterLimit) - bufferPos);
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- }
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- return bufferPos;
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- }
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- }
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-
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- /// <summary>
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- /// Returns the last tag read, or 0 if no tags have been read or we've read beyond
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- /// the end of the stream.
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- /// </summary>
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- internal uint LastTag { get { return lastTag; } }
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-
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- /// <summary>
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- /// Returns the size limit for this stream.
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- /// </summary>
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- /// <remarks>
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- /// This limit is applied when reading from the underlying stream, as a sanity check. It is
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- /// not applied when reading from a byte array data source without an underlying stream.
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- /// The default value is 64MB.
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- /// </remarks>
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- /// <value>
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- /// The size limit.
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- /// </value>
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- public int SizeLimit { get { return sizeLimit; } }
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-
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- /// <summary>
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- /// Returns the recursion limit for this stream. This limit is applied whilst reading messages,
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- /// to avoid maliciously-recursive data.
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- /// </summary>
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- /// <remarks>
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- /// The default limit is 64.
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- /// </remarks>
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- /// <value>
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- /// The recursion limit for this stream.
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- /// </value>
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- public int RecursionLimit { get { return recursionLimit; } }
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-
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- /// <summary>
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- /// Disposes of this instance, potentially closing any underlying stream.
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- /// </summary>
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- /// <remarks>
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- /// As there is no flushing to perform here, disposing of a <see cref="CodedInputStream"/> which
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- /// was constructed with the <c>leaveOpen</c> option parameter set to <c>true</c> (or one which
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- /// was constructed to read from a byte array) has no effect.
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- /// </remarks>
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- public void Dispose()
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- {
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- if (!leaveOpen)
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- {
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- input.Dispose();
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- }
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- }
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-
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- #region Validation
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- /// <summary>
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- /// Verifies that the last call to ReadTag() returned tag 0 - in other words,
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- /// we've reached the end of the stream when we expected to.
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- /// </summary>
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- /// <exception cref="InvalidProtocolBufferException">The
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- /// tag read was not the one specified</exception>
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- internal void CheckReadEndOfStreamTag()
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- {
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- if (lastTag != 0)
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- {
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- throw InvalidProtocolBufferException.MoreDataAvailable();
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- }
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- }
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- #endregion
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-
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- #region Reading of tags etc
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-
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- /// <summary>
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- /// Peeks at the next field tag. This is like calling <see cref="ReadTag"/>, but the
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- /// tag is not consumed. (So a subsequent call to <see cref="ReadTag"/> will return the
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- /// same value.)
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- /// </summary>
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- public uint PeekTag()
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- {
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- if (hasNextTag)
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- {
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- return nextTag;
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- }
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-
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- uint savedLast = lastTag;
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- nextTag = ReadTag();
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- hasNextTag = true;
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- lastTag = savedLast; // Undo the side effect of ReadTag
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- return nextTag;
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- }
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-
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- /// <summary>
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- /// Reads a field tag, returning the tag of 0 for "end of stream".
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- /// </summary>
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- /// <remarks>
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- /// If this method returns 0, it doesn't necessarily mean the end of all
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- /// the data in this CodedInputStream; it may be the end of the logical stream
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- /// for an embedded message, for example.
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- /// </remarks>
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- /// <returns>The next field tag, or 0 for end of stream. (0 is never a valid tag.)</returns>
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- public uint ReadTag()
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- {
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- if (hasNextTag)
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- {
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- lastTag = nextTag;
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- hasNextTag = false;
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- return lastTag;
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- }
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-
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- // Optimize for the incredibly common case of having at least two bytes left in the buffer,
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- // and those two bytes being enough to get the tag. This will be true for fields up to 4095.
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- if (bufferPos + 2 <= bufferSize)
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- {
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- int tmp = buffer[bufferPos++];
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- if (tmp < 128)
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- {
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- lastTag = (uint)tmp;
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- }
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- else
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- {
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- int result = tmp & 0x7f;
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- if ((tmp = buffer[bufferPos++]) < 128)
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- {
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- result |= tmp << 7;
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- lastTag = (uint) result;
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- }
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- else
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- {
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- // Nope, rewind and go the potentially slow route.
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- bufferPos -= 2;
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- lastTag = ReadRawVarint32();
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- }
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- }
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- }
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- else
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- {
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- if (IsAtEnd)
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- {
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- lastTag = 0;
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- return 0; // This is the only case in which we return 0.
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- }
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-
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- lastTag = ReadRawVarint32();
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- }
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- if (lastTag == 0)
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- {
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- // If we actually read zero, that's not a valid tag.
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- throw InvalidProtocolBufferException.InvalidTag();
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- }
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- return lastTag;
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- }
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-
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- /// <summary>
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- /// Skips the data for the field with the tag we've just read.
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- /// This should be called directly after <see cref="ReadTag"/>, when
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- /// the caller wishes to skip an unknown field.
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- /// </summary>
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- /// <remarks>
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- /// This method throws <see cref="InvalidProtocolBufferException"/> if the last-read tag was an end-group tag.
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- /// If a caller wishes to skip a group, they should skip the whole group, by calling this method after reading the
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- /// start-group tag. This behavior allows callers to call this method on any field they don't understand, correctly
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- /// resulting in an error if an end-group tag has not been paired with an earlier start-group tag.
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- /// </remarks>
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- /// <exception cref="InvalidProtocolBufferException">The last tag was an end-group tag</exception>
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- /// <exception cref="InvalidOperationException">The last read operation read to the end of the logical stream</exception>
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- public void SkipLastField()
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- {
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- if (lastTag == 0)
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- {
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- throw new InvalidOperationException("SkipLastField cannot be called at the end of a stream");
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- }
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- switch (WireFormat.GetTagWireType(lastTag))
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- {
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- case WireFormat.WireType.StartGroup:
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- SkipGroup(lastTag);
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- break;
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- case WireFormat.WireType.EndGroup:
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- throw new InvalidProtocolBufferException("SkipLastField called on an end-group tag, indicating that the corresponding start-group was missing");
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- case WireFormat.WireType.Fixed32:
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- ReadFixed32();
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- break;
|
|
|
- case WireFormat.WireType.Fixed64:
|
|
|
- ReadFixed64();
|
|
|
- break;
|
|
|
- case WireFormat.WireType.LengthDelimited:
|
|
|
- var length = ReadLength();
|
|
|
- SkipRawBytes(length);
|
|
|
- break;
|
|
|
- case WireFormat.WireType.Varint:
|
|
|
- ReadRawVarint32();
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- private void SkipGroup(uint startGroupTag)
|
|
|
- {
|
|
|
- // Note: Currently we expect this to be the way that groups are read. We could put the recursion
|
|
|
- // depth changes into the ReadTag method instead, potentially...
|
|
|
- recursionDepth++;
|
|
|
- if (recursionDepth >= recursionLimit)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.RecursionLimitExceeded();
|
|
|
- }
|
|
|
- uint tag;
|
|
|
- while (true)
|
|
|
- {
|
|
|
- tag = ReadTag();
|
|
|
- if (tag == 0)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
- // Can't call SkipLastField for this case- that would throw.
|
|
|
- if (WireFormat.GetTagWireType(tag) == WireFormat.WireType.EndGroup)
|
|
|
- {
|
|
|
- break;
|
|
|
- }
|
|
|
- // This recursion will allow us to handle nested groups.
|
|
|
- SkipLastField();
|
|
|
- }
|
|
|
- int startField = WireFormat.GetTagFieldNumber(startGroupTag);
|
|
|
- int endField = WireFormat.GetTagFieldNumber(tag);
|
|
|
- if (startField != endField)
|
|
|
- {
|
|
|
- throw new InvalidProtocolBufferException("Mismatched end-group tag. Started with field " + startField + "; ended with field " + endField);
|
|
|
- }
|
|
|
- recursionDepth--;
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a double field from the stream.
|
|
|
- /// </summary>
|
|
|
- public double ReadDouble()
|
|
|
- {
|
|
|
- return BitConverter.Int64BitsToDouble((long) ReadRawLittleEndian64());
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a float field from the stream.
|
|
|
- /// </summary>
|
|
|
- public float ReadFloat()
|
|
|
- {
|
|
|
- if (BitConverter.IsLittleEndian && 4 <= bufferSize - bufferPos)
|
|
|
- {
|
|
|
- float ret = BitConverter.ToSingle(buffer, bufferPos);
|
|
|
- bufferPos += 4;
|
|
|
- return ret;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- byte[] rawBytes = ReadRawBytes(4);
|
|
|
- if (!BitConverter.IsLittleEndian)
|
|
|
- {
|
|
|
- ByteArray.Reverse(rawBytes);
|
|
|
- }
|
|
|
- return BitConverter.ToSingle(rawBytes, 0);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a uint64 field from the stream.
|
|
|
- /// </summary>
|
|
|
- public ulong ReadUInt64()
|
|
|
- {
|
|
|
- return ReadRawVarint64();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads an int64 field from the stream.
|
|
|
- /// </summary>
|
|
|
- public long ReadInt64()
|
|
|
- {
|
|
|
- return (long) ReadRawVarint64();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads an int32 field from the stream.
|
|
|
- /// </summary>
|
|
|
- public int ReadInt32()
|
|
|
- {
|
|
|
- return (int) ReadRawVarint32();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a fixed64 field from the stream.
|
|
|
- /// </summary>
|
|
|
- public ulong ReadFixed64()
|
|
|
- {
|
|
|
- return ReadRawLittleEndian64();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a fixed32 field from the stream.
|
|
|
- /// </summary>
|
|
|
- public uint ReadFixed32()
|
|
|
- {
|
|
|
- return ReadRawLittleEndian32();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a bool field from the stream.
|
|
|
- /// </summary>
|
|
|
- public bool ReadBool()
|
|
|
- {
|
|
|
- return ReadRawVarint32() != 0;
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a string field from the stream.
|
|
|
- /// </summary>
|
|
|
- public string ReadString()
|
|
|
- {
|
|
|
- int length = ReadLength();
|
|
|
- // No need to read any data for an empty string.
|
|
|
- if (length == 0)
|
|
|
- {
|
|
|
- return "";
|
|
|
- }
|
|
|
- if (length <= bufferSize - bufferPos)
|
|
|
- {
|
|
|
- // Fast path: We already have the bytes in a contiguous buffer, so
|
|
|
- // just copy directly from it.
|
|
|
- String result = CodedOutputStream.Utf8Encoding.GetString(buffer, bufferPos, length);
|
|
|
- bufferPos += length;
|
|
|
- return result;
|
|
|
- }
|
|
|
- // Slow path: Build a byte array first then copy it.
|
|
|
- return CodedOutputStream.Utf8Encoding.GetString(ReadRawBytes(length), 0, length);
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads an embedded message field value from the stream.
|
|
|
- /// </summary>
|
|
|
- public void ReadMessage(IMessage builder)
|
|
|
- {
|
|
|
- int length = ReadLength();
|
|
|
- if (recursionDepth >= recursionLimit)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.RecursionLimitExceeded();
|
|
|
- }
|
|
|
- int oldLimit = PushLimit(length);
|
|
|
- ++recursionDepth;
|
|
|
- builder.MergeFrom(this);
|
|
|
- CheckReadEndOfStreamTag();
|
|
|
- // Check that we've read exactly as much data as expected.
|
|
|
- if (!ReachedLimit)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
- --recursionDepth;
|
|
|
- PopLimit(oldLimit);
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a bytes field value from the stream.
|
|
|
- /// </summary>
|
|
|
- public ByteString ReadBytes()
|
|
|
- {
|
|
|
- int length = ReadLength();
|
|
|
- if (length <= bufferSize - bufferPos && length > 0)
|
|
|
- {
|
|
|
- // Fast path: We already have the bytes in a contiguous buffer, so
|
|
|
- // just copy directly from it.
|
|
|
- ByteString result = ByteString.CopyFrom(buffer, bufferPos, length);
|
|
|
- bufferPos += length;
|
|
|
- return result;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- // Slow path: Build a byte array and attach it to a new ByteString.
|
|
|
- return ByteString.AttachBytes(ReadRawBytes(length));
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a uint32 field value from the stream.
|
|
|
- /// </summary>
|
|
|
- public uint ReadUInt32()
|
|
|
- {
|
|
|
- return ReadRawVarint32();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads an enum field value from the stream.
|
|
|
- /// </summary>
|
|
|
- public int ReadEnum()
|
|
|
- {
|
|
|
- // Currently just a pass-through, but it's nice to separate it logically from WriteInt32.
|
|
|
- return (int) ReadRawVarint32();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads an sfixed32 field value from the stream.
|
|
|
- /// </summary>
|
|
|
- public int ReadSFixed32()
|
|
|
- {
|
|
|
- return (int) ReadRawLittleEndian32();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads an sfixed64 field value from the stream.
|
|
|
- /// </summary>
|
|
|
- public long ReadSFixed64()
|
|
|
- {
|
|
|
- return (long) ReadRawLittleEndian64();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads an sint32 field value from the stream.
|
|
|
- /// </summary>
|
|
|
- public int ReadSInt32()
|
|
|
- {
|
|
|
- return DecodeZigZag32(ReadRawVarint32());
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads an sint64 field value from the stream.
|
|
|
- /// </summary>
|
|
|
- public long ReadSInt64()
|
|
|
- {
|
|
|
- return DecodeZigZag64(ReadRawVarint64());
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a length for length-delimited data.
|
|
|
- /// </summary>
|
|
|
- /// <remarks>
|
|
|
- /// This is internally just reading a varint, but this method exists
|
|
|
- /// to make the calling code clearer.
|
|
|
- /// </remarks>
|
|
|
- public int ReadLength()
|
|
|
- {
|
|
|
- return (int) ReadRawVarint32();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Peeks at the next tag in the stream. If it matches <paramref name="tag"/>,
|
|
|
- /// the tag is consumed and the method returns <c>true</c>; otherwise, the
|
|
|
- /// stream is left in the original position and the method returns <c>false</c>.
|
|
|
- /// </summary>
|
|
|
- public bool MaybeConsumeTag(uint tag)
|
|
|
- {
|
|
|
- if (PeekTag() == tag)
|
|
|
- {
|
|
|
- hasNextTag = false;
|
|
|
- return true;
|
|
|
- }
|
|
|
- return false;
|
|
|
- }
|
|
|
-
|
|
|
- #endregion
|
|
|
-
|
|
|
- #region Underlying reading primitives
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Same code as ReadRawVarint32, but read each byte individually, checking for
|
|
|
- /// buffer overflow.
|
|
|
- /// </summary>
|
|
|
- private uint SlowReadRawVarint32()
|
|
|
- {
|
|
|
- int tmp = ReadRawByte();
|
|
|
- if (tmp < 128)
|
|
|
- {
|
|
|
- return (uint) tmp;
|
|
|
- }
|
|
|
- int result = tmp & 0x7f;
|
|
|
- if ((tmp = ReadRawByte()) < 128)
|
|
|
- {
|
|
|
- result |= tmp << 7;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- result |= (tmp & 0x7f) << 7;
|
|
|
- if ((tmp = ReadRawByte()) < 128)
|
|
|
- {
|
|
|
- result |= tmp << 14;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- result |= (tmp & 0x7f) << 14;
|
|
|
- if ((tmp = ReadRawByte()) < 128)
|
|
|
- {
|
|
|
- result |= tmp << 21;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- result |= (tmp & 0x7f) << 21;
|
|
|
- result |= (tmp = ReadRawByte()) << 28;
|
|
|
- if (tmp >= 128)
|
|
|
- {
|
|
|
- // Discard upper 32 bits.
|
|
|
- for (int i = 0; i < 5; i++)
|
|
|
- {
|
|
|
- if (ReadRawByte() < 128)
|
|
|
- {
|
|
|
- return (uint) result;
|
|
|
- }
|
|
|
- }
|
|
|
- throw InvalidProtocolBufferException.MalformedVarint();
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- return (uint) result;
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a raw Varint from the stream. If larger than 32 bits, discard the upper bits.
|
|
|
- /// This method is optimised for the case where we've got lots of data in the buffer.
|
|
|
- /// That means we can check the size just once, then just read directly from the buffer
|
|
|
- /// without constant rechecking of the buffer length.
|
|
|
- /// </summary>
|
|
|
- internal uint ReadRawVarint32()
|
|
|
- {
|
|
|
- if (bufferPos + 5 > bufferSize)
|
|
|
- {
|
|
|
- return SlowReadRawVarint32();
|
|
|
- }
|
|
|
-
|
|
|
- int tmp = buffer[bufferPos++];
|
|
|
- if (tmp < 128)
|
|
|
- {
|
|
|
- return (uint) tmp;
|
|
|
- }
|
|
|
- int result = tmp & 0x7f;
|
|
|
- if ((tmp = buffer[bufferPos++]) < 128)
|
|
|
- {
|
|
|
- result |= tmp << 7;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- result |= (tmp & 0x7f) << 7;
|
|
|
- if ((tmp = buffer[bufferPos++]) < 128)
|
|
|
- {
|
|
|
- result |= tmp << 14;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- result |= (tmp & 0x7f) << 14;
|
|
|
- if ((tmp = buffer[bufferPos++]) < 128)
|
|
|
- {
|
|
|
- result |= tmp << 21;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- result |= (tmp & 0x7f) << 21;
|
|
|
- result |= (tmp = buffer[bufferPos++]) << 28;
|
|
|
- if (tmp >= 128)
|
|
|
- {
|
|
|
- // Discard upper 32 bits.
|
|
|
- // Note that this has to use ReadRawByte() as we only ensure we've
|
|
|
- // got at least 5 bytes at the start of the method. This lets us
|
|
|
- // use the fast path in more cases, and we rarely hit this section of code.
|
|
|
- for (int i = 0; i < 5; i++)
|
|
|
- {
|
|
|
- if (ReadRawByte() < 128)
|
|
|
- {
|
|
|
- return (uint) result;
|
|
|
- }
|
|
|
- }
|
|
|
- throw InvalidProtocolBufferException.MalformedVarint();
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
- return (uint) result;
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a varint from the input one byte at a time, so that it does not
|
|
|
- /// read any bytes after the end of the varint. If you simply wrapped the
|
|
|
- /// stream in a CodedInputStream and used ReadRawVarint32(Stream)
|
|
|
- /// then you would probably end up reading past the end of the varint since
|
|
|
- /// CodedInputStream buffers its input.
|
|
|
- /// </summary>
|
|
|
- /// <param name="input"></param>
|
|
|
- /// <returns></returns>
|
|
|
- internal static uint ReadRawVarint32(Stream input)
|
|
|
- {
|
|
|
- int result = 0;
|
|
|
- int offset = 0;
|
|
|
- for (; offset < 32; offset += 7)
|
|
|
- {
|
|
|
- int b = input.ReadByte();
|
|
|
- if (b == -1)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
- result |= (b & 0x7f) << offset;
|
|
|
- if ((b & 0x80) == 0)
|
|
|
- {
|
|
|
- return (uint) result;
|
|
|
- }
|
|
|
- }
|
|
|
- // Keep reading up to 64 bits.
|
|
|
- for (; offset < 64; offset += 7)
|
|
|
- {
|
|
|
- int b = input.ReadByte();
|
|
|
- if (b == -1)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
- if ((b & 0x80) == 0)
|
|
|
- {
|
|
|
- return (uint) result;
|
|
|
- }
|
|
|
- }
|
|
|
- throw InvalidProtocolBufferException.MalformedVarint();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a raw varint from the stream.
|
|
|
- /// </summary>
|
|
|
- internal ulong ReadRawVarint64()
|
|
|
- {
|
|
|
- int shift = 0;
|
|
|
- ulong result = 0;
|
|
|
- while (shift < 64)
|
|
|
- {
|
|
|
- byte b = ReadRawByte();
|
|
|
- result |= (ulong) (b & 0x7F) << shift;
|
|
|
- if ((b & 0x80) == 0)
|
|
|
- {
|
|
|
- return result;
|
|
|
- }
|
|
|
- shift += 7;
|
|
|
- }
|
|
|
- throw InvalidProtocolBufferException.MalformedVarint();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a 32-bit little-endian integer from the stream.
|
|
|
- /// </summary>
|
|
|
- internal uint ReadRawLittleEndian32()
|
|
|
- {
|
|
|
- uint b1 = ReadRawByte();
|
|
|
- uint b2 = ReadRawByte();
|
|
|
- uint b3 = ReadRawByte();
|
|
|
- uint b4 = ReadRawByte();
|
|
|
- return b1 | (b2 << 8) | (b3 << 16) | (b4 << 24);
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a 64-bit little-endian integer from the stream.
|
|
|
- /// </summary>
|
|
|
- internal ulong ReadRawLittleEndian64()
|
|
|
- {
|
|
|
- ulong b1 = ReadRawByte();
|
|
|
- ulong b2 = ReadRawByte();
|
|
|
- ulong b3 = ReadRawByte();
|
|
|
- ulong b4 = ReadRawByte();
|
|
|
- ulong b5 = ReadRawByte();
|
|
|
- ulong b6 = ReadRawByte();
|
|
|
- ulong b7 = ReadRawByte();
|
|
|
- ulong b8 = ReadRawByte();
|
|
|
- return b1 | (b2 << 8) | (b3 << 16) | (b4 << 24)
|
|
|
- | (b5 << 32) | (b6 << 40) | (b7 << 48) | (b8 << 56);
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Decode a 32-bit value with ZigZag encoding.
|
|
|
- /// </summary>
|
|
|
- /// <remarks>
|
|
|
- /// ZigZag encodes signed integers into values that can be efficiently
|
|
|
- /// encoded with varint. (Otherwise, negative values must be
|
|
|
- /// sign-extended to 64 bits to be varint encoded, thus always taking
|
|
|
- /// 10 bytes on the wire.)
|
|
|
- /// </remarks>
|
|
|
- internal static int DecodeZigZag32(uint n)
|
|
|
- {
|
|
|
- return (int)(n >> 1) ^ -(int)(n & 1);
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Decode a 32-bit value with ZigZag encoding.
|
|
|
- /// </summary>
|
|
|
- /// <remarks>
|
|
|
- /// ZigZag encodes signed integers into values that can be efficiently
|
|
|
- /// encoded with varint. (Otherwise, negative values must be
|
|
|
- /// sign-extended to 64 bits to be varint encoded, thus always taking
|
|
|
- /// 10 bytes on the wire.)
|
|
|
- /// </remarks>
|
|
|
- internal static long DecodeZigZag64(ulong n)
|
|
|
- {
|
|
|
- return (long)(n >> 1) ^ -(long)(n & 1);
|
|
|
- }
|
|
|
- #endregion
|
|
|
-
|
|
|
- #region Internal reading and buffer management
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Sets currentLimit to (current position) + byteLimit. This is called
|
|
|
- /// when descending into a length-delimited embedded message. The previous
|
|
|
- /// limit is returned.
|
|
|
- /// </summary>
|
|
|
- /// <returns>The old limit.</returns>
|
|
|
- internal int PushLimit(int byteLimit)
|
|
|
- {
|
|
|
- if (byteLimit < 0)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.NegativeSize();
|
|
|
- }
|
|
|
- byteLimit += totalBytesRetired + bufferPos;
|
|
|
- int oldLimit = currentLimit;
|
|
|
- if (byteLimit > oldLimit)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
- currentLimit = byteLimit;
|
|
|
-
|
|
|
- RecomputeBufferSizeAfterLimit();
|
|
|
-
|
|
|
- return oldLimit;
|
|
|
- }
|
|
|
-
|
|
|
- private void RecomputeBufferSizeAfterLimit()
|
|
|
- {
|
|
|
- bufferSize += bufferSizeAfterLimit;
|
|
|
- int bufferEnd = totalBytesRetired + bufferSize;
|
|
|
- if (bufferEnd > currentLimit)
|
|
|
- {
|
|
|
- // Limit is in current buffer.
|
|
|
- bufferSizeAfterLimit = bufferEnd - currentLimit;
|
|
|
- bufferSize -= bufferSizeAfterLimit;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- bufferSizeAfterLimit = 0;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Discards the current limit, returning the previous limit.
|
|
|
- /// </summary>
|
|
|
- internal void PopLimit(int oldLimit)
|
|
|
- {
|
|
|
- currentLimit = oldLimit;
|
|
|
- RecomputeBufferSizeAfterLimit();
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Returns whether or not all the data before the limit has been read.
|
|
|
- /// </summary>
|
|
|
- /// <returns></returns>
|
|
|
- internal bool ReachedLimit
|
|
|
- {
|
|
|
- get
|
|
|
- {
|
|
|
- if (currentLimit == int.MaxValue)
|
|
|
- {
|
|
|
- return false;
|
|
|
- }
|
|
|
- int currentAbsolutePosition = totalBytesRetired + bufferPos;
|
|
|
- return currentAbsolutePosition >= currentLimit;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Returns true if the stream has reached the end of the input. This is the
|
|
|
- /// case if either the end of the underlying input source has been reached or
|
|
|
- /// the stream has reached a limit created using PushLimit.
|
|
|
- /// </summary>
|
|
|
- public bool IsAtEnd
|
|
|
- {
|
|
|
- get { return bufferPos == bufferSize && !RefillBuffer(false); }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Called when buffer is empty to read more bytes from the
|
|
|
- /// input. If <paramref name="mustSucceed"/> is true, RefillBuffer() gurantees that
|
|
|
- /// either there will be at least one byte in the buffer when it returns
|
|
|
- /// or it will throw an exception. If <paramref name="mustSucceed"/> is false,
|
|
|
- /// RefillBuffer() returns false if no more bytes were available.
|
|
|
- /// </summary>
|
|
|
- /// <param name="mustSucceed"></param>
|
|
|
- /// <returns></returns>
|
|
|
- private bool RefillBuffer(bool mustSucceed)
|
|
|
- {
|
|
|
- if (bufferPos < bufferSize)
|
|
|
- {
|
|
|
- throw new InvalidOperationException("RefillBuffer() called when buffer wasn't empty.");
|
|
|
- }
|
|
|
-
|
|
|
- if (totalBytesRetired + bufferSize == currentLimit)
|
|
|
- {
|
|
|
- // Oops, we hit a limit.
|
|
|
- if (mustSucceed)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- return false;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- totalBytesRetired += bufferSize;
|
|
|
-
|
|
|
- bufferPos = 0;
|
|
|
- bufferSize = (input == null) ? 0 : input.Read(buffer, 0, buffer.Length);
|
|
|
- if (bufferSize < 0)
|
|
|
- {
|
|
|
- throw new InvalidOperationException("Stream.Read returned a negative count");
|
|
|
- }
|
|
|
- if (bufferSize == 0)
|
|
|
- {
|
|
|
- if (mustSucceed)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- return false;
|
|
|
- }
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- RecomputeBufferSizeAfterLimit();
|
|
|
- int totalBytesRead =
|
|
|
- totalBytesRetired + bufferSize + bufferSizeAfterLimit;
|
|
|
- if (totalBytesRead > sizeLimit || totalBytesRead < 0)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.SizeLimitExceeded();
|
|
|
- }
|
|
|
- return true;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Read one byte from the input.
|
|
|
- /// </summary>
|
|
|
- /// <exception cref="InvalidProtocolBufferException">
|
|
|
- /// the end of the stream or the current limit was reached
|
|
|
- /// </exception>
|
|
|
- internal byte ReadRawByte()
|
|
|
- {
|
|
|
- if (bufferPos == bufferSize)
|
|
|
- {
|
|
|
- RefillBuffer(true);
|
|
|
- }
|
|
|
- return buffer[bufferPos++];
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads a fixed size of bytes from the input.
|
|
|
- /// </summary>
|
|
|
- /// <exception cref="InvalidProtocolBufferException">
|
|
|
- /// the end of the stream or the current limit was reached
|
|
|
- /// </exception>
|
|
|
- internal byte[] ReadRawBytes(int size)
|
|
|
- {
|
|
|
- if (size < 0)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.NegativeSize();
|
|
|
- }
|
|
|
-
|
|
|
- if (totalBytesRetired + bufferPos + size > currentLimit)
|
|
|
- {
|
|
|
- // Read to the end of the stream (up to the current limit) anyway.
|
|
|
- SkipRawBytes(currentLimit - totalBytesRetired - bufferPos);
|
|
|
- // Then fail.
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
-
|
|
|
- if (size <= bufferSize - bufferPos)
|
|
|
- {
|
|
|
- // We have all the bytes we need already.
|
|
|
- byte[] bytes = new byte[size];
|
|
|
- ByteArray.Copy(buffer, bufferPos, bytes, 0, size);
|
|
|
- bufferPos += size;
|
|
|
- return bytes;
|
|
|
- }
|
|
|
- else if (size < buffer.Length)
|
|
|
- {
|
|
|
- // Reading more bytes than are in the buffer, but not an excessive number
|
|
|
- // of bytes. We can safely allocate the resulting array ahead of time.
|
|
|
-
|
|
|
- // First copy what we have.
|
|
|
- byte[] bytes = new byte[size];
|
|
|
- int pos = bufferSize - bufferPos;
|
|
|
- ByteArray.Copy(buffer, bufferPos, bytes, 0, pos);
|
|
|
- bufferPos = bufferSize;
|
|
|
-
|
|
|
- // We want to use RefillBuffer() and then copy from the buffer into our
|
|
|
- // byte array rather than reading directly into our byte array because
|
|
|
- // the input may be unbuffered.
|
|
|
- RefillBuffer(true);
|
|
|
-
|
|
|
- while (size - pos > bufferSize)
|
|
|
- {
|
|
|
- Buffer.BlockCopy(buffer, 0, bytes, pos, bufferSize);
|
|
|
- pos += bufferSize;
|
|
|
- bufferPos = bufferSize;
|
|
|
- RefillBuffer(true);
|
|
|
- }
|
|
|
-
|
|
|
- ByteArray.Copy(buffer, 0, bytes, pos, size - pos);
|
|
|
- bufferPos = size - pos;
|
|
|
-
|
|
|
- return bytes;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- // The size is very large. For security reasons, we can't allocate the
|
|
|
- // entire byte array yet. The size comes directly from the input, so a
|
|
|
- // maliciously-crafted message could provide a bogus very large size in
|
|
|
- // order to trick the app into allocating a lot of memory. We avoid this
|
|
|
- // by allocating and reading only a small chunk at a time, so that the
|
|
|
- // malicious message must actually *be* extremely large to cause
|
|
|
- // problems. Meanwhile, we limit the allowed size of a message elsewhere.
|
|
|
-
|
|
|
- // Remember the buffer markers since we'll have to copy the bytes out of
|
|
|
- // it later.
|
|
|
- int originalBufferPos = bufferPos;
|
|
|
- int originalBufferSize = bufferSize;
|
|
|
-
|
|
|
- // Mark the current buffer consumed.
|
|
|
- totalBytesRetired += bufferSize;
|
|
|
- bufferPos = 0;
|
|
|
- bufferSize = 0;
|
|
|
-
|
|
|
- // Read all the rest of the bytes we need.
|
|
|
- int sizeLeft = size - (originalBufferSize - originalBufferPos);
|
|
|
- List<byte[]> chunks = new List<byte[]>();
|
|
|
-
|
|
|
- while (sizeLeft > 0)
|
|
|
- {
|
|
|
- byte[] chunk = new byte[Math.Min(sizeLeft, buffer.Length)];
|
|
|
- int pos = 0;
|
|
|
- while (pos < chunk.Length)
|
|
|
- {
|
|
|
- int n = (input == null) ? -1 : input.Read(chunk, pos, chunk.Length - pos);
|
|
|
- if (n <= 0)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
- totalBytesRetired += n;
|
|
|
- pos += n;
|
|
|
- }
|
|
|
- sizeLeft -= chunk.Length;
|
|
|
- chunks.Add(chunk);
|
|
|
- }
|
|
|
-
|
|
|
- // OK, got everything. Now concatenate it all into one buffer.
|
|
|
- byte[] bytes = new byte[size];
|
|
|
-
|
|
|
- // Start by copying the leftover bytes from this.buffer.
|
|
|
- int newPos = originalBufferSize - originalBufferPos;
|
|
|
- ByteArray.Copy(buffer, originalBufferPos, bytes, 0, newPos);
|
|
|
-
|
|
|
- // And now all the chunks.
|
|
|
- foreach (byte[] chunk in chunks)
|
|
|
- {
|
|
|
- Buffer.BlockCopy(chunk, 0, bytes, newPos, chunk.Length);
|
|
|
- newPos += chunk.Length;
|
|
|
- }
|
|
|
-
|
|
|
- // Done.
|
|
|
- return bytes;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Reads and discards <paramref name="size"/> bytes.
|
|
|
- /// </summary>
|
|
|
- /// <exception cref="InvalidProtocolBufferException">the end of the stream
|
|
|
- /// or the current limit was reached</exception>
|
|
|
- private void SkipRawBytes(int size)
|
|
|
- {
|
|
|
- if (size < 0)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.NegativeSize();
|
|
|
- }
|
|
|
-
|
|
|
- if (totalBytesRetired + bufferPos + size > currentLimit)
|
|
|
- {
|
|
|
- // Read to the end of the stream anyway.
|
|
|
- SkipRawBytes(currentLimit - totalBytesRetired - bufferPos);
|
|
|
- // Then fail.
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
-
|
|
|
- if (size <= bufferSize - bufferPos)
|
|
|
- {
|
|
|
- // We have all the bytes we need already.
|
|
|
- bufferPos += size;
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- // Skipping more bytes than are in the buffer. First skip what we have.
|
|
|
- int pos = bufferSize - bufferPos;
|
|
|
-
|
|
|
- // ROK 5/7/2013 Issue #54: should retire all bytes in buffer (bufferSize)
|
|
|
- // totalBytesRetired += pos;
|
|
|
- totalBytesRetired += bufferSize;
|
|
|
-
|
|
|
- bufferPos = 0;
|
|
|
- bufferSize = 0;
|
|
|
-
|
|
|
- // Then skip directly from the InputStream for the rest.
|
|
|
- if (pos < size)
|
|
|
- {
|
|
|
- if (input == null)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
- SkipImpl(size - pos);
|
|
|
- totalBytesRetired += size - pos;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /// <summary>
|
|
|
- /// Abstraction of skipping to cope with streams which can't really skip.
|
|
|
- /// </summary>
|
|
|
- private void SkipImpl(int amountToSkip)
|
|
|
- {
|
|
|
- if (input.CanSeek)
|
|
|
- {
|
|
|
- long previousPosition = input.Position;
|
|
|
- input.Position += amountToSkip;
|
|
|
- if (input.Position != previousPosition + amountToSkip)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
- }
|
|
|
- else
|
|
|
- {
|
|
|
- byte[] skipBuffer = new byte[Math.Min(1024, amountToSkip)];
|
|
|
- while (amountToSkip > 0)
|
|
|
- {
|
|
|
- int bytesRead = input.Read(skipBuffer, 0, Math.Min(skipBuffer.Length, amountToSkip));
|
|
|
- if (bytesRead <= 0)
|
|
|
- {
|
|
|
- throw InvalidProtocolBufferException.TruncatedMessage();
|
|
|
- }
|
|
|
- amountToSkip -= bytesRead;
|
|
|
- }
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- #endregion
|
|
|
- }
|
|
|
-}
|