1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
| /// <summary>
/// Class to handle serialization of Strings in the format of a MFC <c>CArchive</c>.
/// </summary>
static class MFCStringHelper
{
/// <summary>
/// Write a string in the format of a MFC <c>CArchive</c>.
/// </summary>
/// <param name="writer">[modif] Output stream writer.</param>
/// <param name="str">[in] String to write.</param>
public static void WriteMFCString(BinaryWriter writer, String str)
{
if(writer==null)
throw new ArgumentNullException("writer");
if(str==null)
throw new ArgumentNullException("str");
AfxWriteStringLength(writer, str.Length, true);
writer.Write(str.ToCharArray());
}
/// <summary>
/// Read a string from the format of a MFC <c>archive</c>.
/// </summary>
/// <param name="reader">[in/modif] Input stream reader.</param>
/// <returns>String freshly read.</returns>
public static String ReadMFCString(BinaryReader reader)
{
if(reader==null)
throw new ArgumentNullException("reader");
int charSize;
long qwLength = AfxReadStringLength(reader, out charSize);
int length = checked((int)qwLength);
String sRet = null;
if(charSize==1)
{
//Read ANSI chars and convert
byte[] mbChars = reader.ReadBytes(length);
sRet = Encoding.Default.GetString(mbChars);
}
else
{
//Read unicode chars.
char[] wideChars = reader.ReadChars(length);
sRet = new String(wideChars);
}
Debug.Assert(sRet!=null, "The return string shall not be null at this point");
return sRet;
}
/// <summary>
/// Write a string length in the format of a MFC <c>CArchive</c>.
/// </summary>
/// <remarks>This code was converted from MFC source code file <c>arccore.cpp</c>.</remarks>
/// <param name="ar">[modif] Output stream writer.</param>
/// <param name="nLength">[in] Length to write.</param>
/// <param name="bUnicode">[in] if <c>true</c>, prepend with a "unicode" tag.</param>
static void AfxWriteStringLength(BinaryWriter ar, long nLength, bool bUnicode)
{
Debug.Assert(ar != null, "ar is an internal parameter and shall not be null");
Debug.Assert(nLength >=0, "String length shall not be negative");
if(bUnicode)
{
// Tag Unicode strings
ar.Write((Byte)0xFF);
ar.Write((UInt16)0xFFFE);
}
if(nLength < 255)
{
ar.Write((Byte)nLength);
}
else if(nLength < 0xFFFE)
{
ar.Write((Byte)0xFF);
ar.Write((UInt16)nLength);
}
else if(nLength < 0xFFFFFFFF)
{
ar.Write((Byte)0xFF);
ar.Write((UInt16)0xFFFF);
ar.Write((UInt32)nLength);
}
else
{
ar.Write((Byte)0xFF);
ar.Write((UInt16)0xFFFF);
ar.Write((UInt32)0xFFFFFFFF);
ar.Write((UInt64)nLength);
}
}
/// <summary>
/// Read a string length from the format of a MFC <c>archive</c>.
/// </summary>
/// <remarks>This code was converted from MFC source code file <c>arccore.cpp</c>.</remarks>
/// <param name="ar">[in/modif] Input stream reader.</param>
/// <param name="nCharSize">[out] Character size (1 or 2 bytes).</param>
/// <returns>String length.</returns>
static long AfxReadStringLength(BinaryReader ar, out int nCharSize)
{
Debug.Assert(ar != null, "ar is an internal parameter and shall not be null");
UInt64 qwLength;
UInt32 dwLength;
UInt16 wLength;
Byte byLength;
nCharSize = 1;
// First, try to read a one-byte length
byLength = ar.ReadByte();
if(byLength < 0xFF)
return byLength;
// Try a two-byte length
wLength = ar.ReadUInt16();
if(wLength == 0xFFFE)
{
// Unicode string. Start over at 1-byte length
nCharSize = 2;
byLength = ar.ReadByte();
if(byLength < 0xFF)
return byLength;
// Two-byte length
wLength = ar.ReadUInt16();
// Fall through to continue on same branch as ANSI string
}
if(wLength < 0xFFFF)
return wLength;
// 4-byte length
dwLength = ar.ReadUInt32();
if(dwLength < 0xFFFFFFFF)
return dwLength;
// 8-byte length
qwLength = ar.ReadUInt64();
if(qwLength > Int32.MaxValue)
throw new FormatException("String too long");
return checked((long)qwLength);
}
} |
Repr�sentation m�moire d'un CString
R�pondre avec citation
Partager