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1 #region Copyright notice and license
2 // Protocol Buffers - Google's data interchange format
3 // Copyright 2008 Google Inc.  All rights reserved.
4 // https://developers.google.com/protocol-buffers/
5 //
6 // Redistribution and use in source and binary forms, with or without
7 // modification, are permitted provided that the following conditions are
8 // met:
9 //
10 //     * Redistributions of source code must retain the above copyright
11 // notice, this list of conditions and the following disclaimer.
12 //     * Redistributions in binary form must reproduce the above
13 // copyright notice, this list of conditions and the following disclaimer
14 // in the documentation and/or other materials provided with the
15 // distribution.
16 //     * Neither the name of Google Inc. nor the names of its
17 // contributors may be used to endorse or promote products derived from
18 // this software without specific prior written permission.
19 //
20 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #endregion
32 
33 using System;
34 using System.Buffers;
35 using System.Buffers.Binary;
36 using System.Collections.Generic;
37 using System.IO;
38 using System.Runtime.CompilerServices;
39 using System.Runtime.InteropServices;
40 using System.Security;
41 using System.Text;
42 using Google.Protobuf.Collections;
43 
44 namespace Google.Protobuf
45 {
46 
47     // warning: this is a mutable struct, so it needs to be only passed as a ref!
48     internal struct ParserInternalState
49     {
50         // NOTE: the Span representing the current buffer is kept separate so that this doesn't have to be a ref struct and so it can
51         // be included in CodedInputStream's internal state
52 
53         /// <summary>
54         /// The position within the current buffer (i.e. the next byte to read)
55         /// </summary>
56         internal int bufferPos;
57 
58         /// <summary>
59         /// Size of the current buffer
60         /// </summary>
61         internal int bufferSize;
62 
63         /// <summary>
64         /// If we are currently inside a length-delimited block, this is the number of
65         /// bytes in the buffer that are still available once we leave the delimited block.
66         /// </summary>
67         internal int bufferSizeAfterLimit;
68 
69         /// <summary>
70         /// The absolute position of the end of the current length-delimited block (including totalBytesRetired)
71         /// </summary>
72         internal int currentLimit;
73 
74         /// <summary>
75         /// The total number of consumed before the start of the current buffer. The
76         /// total bytes read up to the current position can be computed as
77         /// totalBytesRetired + bufferPos.
78         /// </summary>
79         internal int totalBytesRetired;
80 
81         internal int recursionDepth;  // current recursion depth
82 
83         internal SegmentedBufferHelper segmentedBufferHelper;
84 
85         /// <summary>
86         /// The last tag we read. 0 indicates we've read to the end of the stream
87         /// (or haven't read anything yet).
88         /// </summary>
89         internal uint lastTag;
90 
91         /// <summary>
92         /// The next tag, used to store the value read by PeekTag.
93         /// </summary>
94         internal uint nextTag;
95         internal bool hasNextTag;
96 
97         // these fields are configuration, they should be readonly
98         internal int sizeLimit;
99         internal int recursionLimit;
100 
101         // If non-null, the top level parse method was started with given coded input stream as an argument
102         // which also means we can potentially fallback to calling MergeFrom(CodedInputStream cis) if needed.
103         internal CodedInputStream CodedInputStream => segmentedBufferHelper.CodedInputStream;
104 
105         /// <summary>
106         /// Internal-only property; when set to true, unknown fields will be discarded while parsing.
107         /// </summary>
108         internal bool DiscardUnknownFields { get; set; }
109 
110         /// <summary>
111         /// Internal-only property; provides extension identifiers to compatible messages while parsing.
112         /// </summary>
113         internal ExtensionRegistry ExtensionRegistry { get; set; }
114     }
115 }