12905761471

Committed 22 Jan 2025 10:03AM UTC coverage: 2.0% (-74.0%) from 75.963%

Build # 12905761471

Build Type

push

github

Committed by

DomCR

Commit Message

version 1.0.6

Run Details

104 of 7676 branches covered (1.35%)

Branch coverage included in aggregate %.

590 of 27024 relevant lines covered (2.18%)

5.13 hits per line

Source File
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0.0

/src/ACadSharp/IO/DWG/CRC32StreamHandler.cs

﻿using System.IO;

namespace ACadSharp.IO.DWG
{
        internal class CRC32StreamHandler : Stream
        {
                public override bool CanRead => _stream.CanRead;
                public override bool CanSeek => _stream.CanSeek;
                public override bool CanWrite => _stream.CanWrite;
                public override long Length => _stream.Length;
                public override long Position
                {
                        get => _stream.Position;
                        set => _stream.Position = value;
                }

                private Stream _stream;

                public uint Seed => ~_seed;

                private uint _seed;

                /// <summary>
                /// Constructor that creates a magic sequence given an array of bytes.
                /// </summary>
                /// <param name="arr">Array of 108 bytes</param>
                /// <param name="seed"></param>
                public CRC32StreamHandler(byte[] arr, uint seed)
                {
                        int randSeed = 1;

                        for (int index = 0; index < arr.Length; ++index)
                        {
                                randSeed *= 0x343fd;
                                randSeed += 0x269ec3;

                                byte values = (byte)(randSeed >> 0x10);
                                arr[index] = (byte)(arr[index] ^ (uint)values);
                        }

                        _stream = new MemoryStream(arr);

                        _seed = ~seed;
                }

                public CRC32StreamHandler(Stream stream, uint seed)
                {
                        _stream = stream;
                        //Reverse the bits
                        _seed = ~seed;
                }

                public override void Flush()
                {
                        _stream.Flush();
                }

                public override int Read(byte[] buffer, int offset, int count)
                {
                        int nbytes = _stream.Read(buffer, offset, count);
                        int length = offset + count;

                        for (int index = offset; index < length; ++index)
                        {
                                _seed = _seed >> 8 ^ CRC.Crc32Table[((int)_seed ^ buffer[index]) & byte.MaxValue];
                        }

                        return nbytes;
                }
                
                public override long Seek(long offset, SeekOrigin origin)
                {
                        return _stream.Seek(offset, origin);
                }
                
                public override void SetLength(long value)
                {
                        _stream.SetLength(value);
                }

                public override void Write(byte[] buffer, int offset, int count)
                {
                        int num = offset + count;

                        for (int index = offset; index < num; ++index)
                                _seed = _seed >> 8 ^ CRC.Crc32Table[((int)_seed ^ buffer[index]) & byte.MaxValue];

                        _stream.Write(buffer, offset, count);
                }
        }
}

1	using System.IO;
2
3	namespace ACadSharp.IO.DWG
4	{
5	internal class CRC32StreamHandler : Stream
6	{
7	public override bool CanRead => _stream.CanRead;	×
8	public override bool CanSeek => _stream.CanSeek;	×
9	public override bool CanWrite => _stream.CanWrite;	×
10	public override long Length => _stream.Length;	×
11	public override long Position
12	{
13	get => _stream.Position;	×
14	set => _stream.Position = value;	×
15	}
16
17	private Stream _stream;
18
19	public uint Seed => ~_seed;	×
20
21	private uint _seed;
22
23	/// <summary>
24	/// Constructor that creates a magic sequence given an array of bytes.
25	/// </summary>
26	/// <param name="arr">Array of 108 bytes</param>
27	/// <param name="seed"></param>
28	public CRC32StreamHandler(byte[] arr, uint seed)	×
29	{	×
30	int randSeed = 1;	×
31
32	for (int index = 0; index < arr.Length; ++index)	×
33	{	×
34	randSeed *= 0x343fd;	×
35	randSeed += 0x269ec3;	×
36
37	byte values = (byte)(randSeed >> 0x10);	×
38	arr[index] = (byte)(arr[index] ^ (uint)values);	×
39	}	×
40
41	_stream = new MemoryStream(arr);	×
42
43	_seed = ~seed;	×
44	}	×
45
46	public CRC32StreamHandler(Stream stream, uint seed)	×
47	{	×
48	_stream = stream;	×
49	//Reverse the bits
50	_seed = ~seed;	×
51	}	×
52
53	public override void Flush()
54	{	×
55	_stream.Flush();	×
56	}	×
57
58	public override int Read(byte[] buffer, int offset, int count)
59	{	×
60	int nbytes = _stream.Read(buffer, offset, count);	×
61	int length = offset + count;	×
62
63	for (int index = offset; index < length; ++index)	×
64	{	×
65	_seed = _seed >> 8 ^ CRC.Crc32Table[((int)_seed ^ buffer[index]) & byte.MaxValue];	×
66	}	×
67
68	return nbytes;	×
69	}	×
70
71	public override long Seek(long offset, SeekOrigin origin)
72	{	×
73	return _stream.Seek(offset, origin);	×
74	}	×
75
76	public override void SetLength(long value)
77	{	×
78	_stream.SetLength(value);	×
79	}	×
80
81	public override void Write(byte[] buffer, int offset, int count)
82	{	×
83	int num = offset + count;	×
84
85	for (int index = offset; index < num; ++index)	×
86	_seed = _seed >> 8 ^ CRC.Crc32Table[((int)_seed ^ buffer[index]) & byte.MaxValue];	×
87
88	_stream.Write(buffer, offset, count);	×
89	}	×
90	}
91	}

DomCR / ACadSharp / 12905761471

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