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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
|
using Ryujinx.Common.Logging;
using System;
using System.IO;
using System.Text;
namespace Ryujinx.HLE.Loaders.Mods
{
class IPSwitchPatcher
{
const string BidHeader = "@nsobid-";
private enum Token
{
Normal,
String,
EscapeChar,
Comment,
}
private readonly StreamReader _reader;
public string BuildId { get; }
public IPSwitchPatcher(StreamReader reader)
{
string header = reader.ReadLine();
if (header == null || !header.StartsWith(BidHeader))
{
Logger.Error?.Print(LogClass.ModLoader, "IPSwitch: Malformed PCHTXT file. Skipping...");
return;
}
_reader = reader;
BuildId = header[BidHeader.Length..].TrimEnd().TrimEnd('0');
}
// Uncomments line and unescapes C style strings within
private static string PreprocessLine(string line)
{
StringBuilder str = new();
Token state = Token.Normal;
for (int i = 0; i < line.Length; ++i)
{
char c = line[i];
char la = i + 1 != line.Length ? line[i + 1] : '\0';
switch (state)
{
case Token.Normal:
state = c == '"' ? Token.String :
c == '/' && la == '/' ? Token.Comment :
c == '/' && la != '/' ? Token.Comment : // Ignore error and stop parsing
Token.Normal;
break;
case Token.String:
state = c switch
{
'"' => Token.Normal,
'\\' => Token.EscapeChar,
_ => Token.String,
};
break;
case Token.EscapeChar:
state = Token.String;
c = c switch
{
'a' => '\a',
'b' => '\b',
'f' => '\f',
'n' => '\n',
'r' => '\r',
't' => '\t',
'v' => '\v',
'\\' => '\\',
_ => '?',
};
break;
}
if (state == Token.Comment)
{
break;
}
if (state < Token.EscapeChar)
{
str.Append(c);
}
}
return str.ToString().Trim();
}
static int ParseHexByte(byte c)
{
if (c >= '0' && c <= '9')
{
return c - '0';
}
else if (c >= 'A' && c <= 'F')
{
return c - 'A' + 10;
}
else if (c >= 'a' && c <= 'f')
{
return c - 'a' + 10;
}
else
{
return 0;
}
}
// Big Endian
static byte[] Hex2ByteArrayBE(string hexstr)
{
if ((hexstr.Length & 1) == 1)
{
return null;
}
byte[] bytes = new byte[hexstr.Length >> 1];
for (int i = 0; i < hexstr.Length; i += 2)
{
int high = ParseHexByte((byte)hexstr[i]);
int low = ParseHexByte((byte)hexstr[i + 1]);
bytes[i >> 1] = (byte)((high << 4) | low);
}
return bytes;
}
// Auto base discovery
private static bool ParseInt(string str, out int value)
{
if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))
{
return int.TryParse(str.AsSpan(2), System.Globalization.NumberStyles.HexNumber, null, out value);
}
else
{
return int.TryParse(str, System.Globalization.NumberStyles.Integer, null, out value);
}
}
private MemPatch Parse()
{
if (_reader == null)
{
return null;
}
MemPatch patches = new();
bool enabled = false;
bool printValues = false;
int offsetShift = 0;
string line;
int lineNum = 0;
static void Print(string s) => Logger.Info?.Print(LogClass.ModLoader, $"IPSwitch: {s}");
void ParseWarn() => Logger.Warning?.Print(LogClass.ModLoader, $"IPSwitch: Parse error at line {lineNum} for bid={BuildId}");
while ((line = _reader.ReadLine()) != null)
{
if (string.IsNullOrWhiteSpace(line))
{
enabled = false;
continue;
}
line = PreprocessLine(line);
lineNum += 1;
if (line.Length == 0)
{
continue;
}
else if (line.StartsWith('#'))
{
Print(line);
}
else if (line.StartsWith("@stop"))
{
break;
}
else if (line.StartsWith("@enabled"))
{
enabled = true;
}
else if (line.StartsWith("@disabled"))
{
enabled = false;
}
else if (line.StartsWith("@flag"))
{
var tokens = line.Split(' ', 3, StringSplitOptions.RemoveEmptyEntries);
if (tokens.Length < 2)
{
ParseWarn();
continue;
}
if (tokens[1] == "offset_shift")
{
if (tokens.Length != 3 || !ParseInt(tokens[2], out offsetShift))
{
ParseWarn();
continue;
}
}
else if (tokens[1] == "print_values")
{
printValues = true;
}
}
else if (line.StartsWith('@'))
{
// Ignore
}
else
{
if (!enabled)
{
continue;
}
var tokens = line.Split(' ', 2, StringSplitOptions.RemoveEmptyEntries);
if (tokens.Length < 2)
{
ParseWarn();
continue;
}
if (!int.TryParse(tokens[0], System.Globalization.NumberStyles.HexNumber, null, out int offset))
{
ParseWarn();
continue;
}
offset += offsetShift;
if (printValues)
{
Print($"print_values 0x{offset:x} <= {tokens[1]}");
}
if (tokens[1][0] == '"')
{
var patch = Encoding.ASCII.GetBytes(tokens[1].Trim('"') + "\0");
patches.Add((uint)offset, patch);
}
else
{
var patch = Hex2ByteArrayBE(tokens[1]);
patches.Add((uint)offset, patch);
}
}
}
return patches;
}
public void AddPatches(MemPatch patches)
{
patches.AddFrom(Parse());
}
}
}
|
