22172973580

Committed 19 Feb 2026 07:44AM UTC coverage: 77.591% (-0.002%) from 77.593%

Build # 22172973580

Build Type

push

github

Committed by

web-flow

Commit Message

Merge pull request #981 from DomCR/dwg-AC1015

Refactor DWG AC15 file header writing and section logic

Coverage Stats

8146 of 11366 branches covered (71.67%)

Branch coverage included in aggregate %.

403 of 420 new or added lines in 6 files covered. (95.95%)

8 existing lines in 4 files now uncovered.

29498 of 37150 relevant lines covered (79.4%)

151486.27 hits per line

Source File
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85.14

/src/ACadSharp/IO/DWG/DwgStreamWriters/DwgFileHeaderWriterBase.cs

﻿using CSUtilities.Converters;
using System;
using System.IO;
using System.Text;

namespace ACadSharp.IO.DWG.DwgStreamWriters;

internal abstract class DwgFileHeaderWriterBase<T> : IDwgFileHeaderWriter
        where T : DwgFileHeader, new()
{
        public T FileHeader { get; } = new T();

        public abstract int FileHeaderSize { get; }

        public abstract int HandleSectionOffset { get; }

        protected CadDocument _document;

        protected Encoding _encoding;

        protected Stream _stream;

        protected ACadVersion _version;

        public DwgFileHeaderWriterBase(Stream stream, Encoding encoding, CadDocument model)
        {
                if (!stream.CanSeek || !stream.CanWrite)
                {
                        throw new ArgumentException();
                }

                this._document = model;
                this._stream = stream;
                this._version = model.Header.Version;
                this._encoding = encoding;
        }

        public abstract void AddSection(string name, MemoryStream stream, bool isCompressed, int decompsize = 0x7400);

        public abstract void WriteFile();

        protected void applyMagicSequence(MemoryStream stream)
        {
                byte[] buffer = stream.GetBuffer();
                for (int i = 0; i < (int)stream.Length; i++)
                {
                        buffer[i] ^= DwgCheckSumCalculator.MagicSequence[i];
                }
        }

        protected void applyMask(byte[] buffer, int offset, int length)
        {
                byte[] bytes = LittleEndianConverter.Instance.GetBytes(0x4164536B ^ (int)this._stream.Position);
                int diff = offset + length;
                while (offset < diff)
                {
                        for (int i = 0; i < 4; i++)
                        {
                                buffer[offset + i] ^= bytes[i];
                        }

                        offset += 4;
                }
        }

        protected bool checkEmptyBytes(byte[] buffer, ulong offset, ulong spearBytes)
        {
                bool result = true;
                ulong num = offset + spearBytes;

                for (ulong i = offset; i < num; i++)
                {
                        if (buffer[i] != 0)
                        {
                                result = false;
                                break;
                        }
                }

                return result;
        }

        protected ushort getFileCodePage()
        {
                ushort codePage = (ushort)CadUtils.GetCodeIndex(CadUtils.GetCodePage(_document.Header.CodePage));
                if (codePage < 1)
                {
                        return 30;
                }
                else
                {
                        return codePage;
                }
        }

        protected void writeMagicNumber()
        {
                for (int i = 0; i < (int)(this._stream.Position % 0x20); i++)
                {
                        this._stream.WriteByte(DwgCheckSumCalculator.MagicSequence[i]);
                }
        }
}

1	using CSUtilities.Converters;
2	using System;
3	using System.IO;
4	using System.Text;
5
6	namespace ACadSharp.IO.DWG.DwgStreamWriters;
7
8	internal abstract class DwgFileHeaderWriterBase<T> : IDwgFileHeaderWriter
9	where T : DwgFileHeader, new()
10	{
11	public T FileHeader { get; } = new T();	11,420✔
12
13	public abstract int FileHeaderSize { get; }
14
15	public abstract int HandleSectionOffset { get; }
16
17	protected CadDocument _document;
18
19	protected Encoding _encoding;
20
21	protected Stream _stream;
22
23	protected ACadVersion _version;
24
25	public DwgFileHeaderWriterBase(Stream stream, Encoding encoding, CadDocument model)	332✔
26	{	332✔
27	if (!stream.CanSeek \|\| !stream.CanWrite)	332!
UNCOV 28	{	×
NEW 29	throw new ArgumentException();	×
30	}
31
32	this._document = model;	332✔
33	this._stream = stream;	332✔
34	this._version = model.Header.Version;	332✔
35	this._encoding = encoding;	332✔
36	}	332✔
37
38	public abstract void AddSection(string name, MemoryStream stream, bool isCompressed, int decompsize = 0x7400);
39
40	public abstract void WriteFile();
41
42	protected void applyMagicSequence(MemoryStream stream)
43	{	264✔
44	byte[] buffer = stream.GetBuffer();	264✔
45	for (int i = 0; i < (int)stream.Length; i++)	57,552✔
46	{	28,512✔
47	buffer[i] ^= DwgCheckSumCalculator.MagicSequence[i];	28,512✔
48	}	28,512✔
49	}	264✔
50
51	protected void applyMask(byte[] buffer, int offset, int length)
52	{	3,432✔
53	byte[] bytes = LittleEndianConverter.Instance.GetBytes(0x4164536B ^ (int)this._stream.Position);	3,432✔
54	int diff = offset + length;	3,432✔
55	while (offset < diff)	30,888✔
56	{	27,456✔
57	for (int i = 0; i < 4; i++)	274,560✔
58	{	109,824✔
59	buffer[offset + i] ^= bytes[i];	109,824✔
60	}	109,824✔
61
62	offset += 4;	27,456✔
63	}	27,456✔
64	}	3,432✔
65
66	protected bool checkEmptyBytes(byte[] buffer, ulong offset, ulong spearBytes)
67	{	3,168✔
68	bool result = true;	3,168✔
69	ulong num = offset + spearBytes;	3,168✔
70
71	for (ulong i = offset; i < num; i++)	20,692✔
72	{	9,818✔
73	if (buffer[i] != 0)	9,818✔
74	{	2,640✔
75	result = false;	2,640✔
76	break;	2,640✔
77	}
78	}	7,178✔
79
80	return result;	3,168✔
81	}	3,168✔
82
83	protected ushort getFileCodePage()
84	{	332✔
85	ushort codePage = (ushort)CadUtils.GetCodeIndex(CadUtils.GetCodePage(_document.Header.CodePage));	332✔
86	if (codePage < 1)	332!
UNCOV 87	{	×
NEW 88	return 30;	×
89	}
90	else
91	{	332✔
92	return codePage;	332✔
93	}
94	}	332✔
95
96	protected void writeMagicNumber()
97	{	3,960✔
98	for (int i = 0; i < (int)(this._stream.Position % 0x20); i++)	7,920!
UNCOV 99	{	×
NEW 100	this._stream.WriteByte(DwgCheckSumCalculator.MagicSequence[i]);	×
UNCOV 101	}	×
102	}	3,960✔
103	}

DomCR / ACadSharp / 22172973580

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