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ryujinx-final/Ryujinx.HLE/Loaders/Mods/IPSwitchPatcher.cs

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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.Substring(BidHeader.Length).TrimEnd().TrimEnd('0');
}
// Uncomments line and unescapes C style strings within
private static string PreprocessLine(string line)
{
StringBuilder str = new StringBuilder();
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.Substring(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 MemPatch();
bool enabled = false;
bool printValues = false;
int offset_shift = 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, $"IPSwitch: Parse error at line {lineNum} for bid={BuildId}");
while ((line = _reader.ReadLine()) != null)
{
if (string.IsNullOrWhiteSpace(line))
{
enabled = false;
continue;
}
line = PreprocessLine(line);
lineNum += 1;
if (line.Length == 0)
{
continue;
}
else if (line.StartsWith('#'))
{
Print(line);
}
else if (line.StartsWith("@stop"))
{
break;
}
else if (line.StartsWith("@enabled"))
{
enabled = true;
}
else if (line.StartsWith("@disabled"))
{
enabled = false;
}
else if (line.StartsWith("@flag"))
{
var tokens = line.Split(' ', 3, StringSplitOptions.RemoveEmptyEntries);
if (tokens.Length < 2)
{
ParseWarn();
continue;
}
if (tokens[1] == "offset_shift")
{
if (tokens.Length != 3 || !ParseInt(tokens[2], out offset_shift))
{
ParseWarn();
continue;
}
}
else if (tokens[1] == "print_values")
{
printValues = true;
}
}
else if (line.StartsWith('@'))
{
// Ignore
}
else
{
if (!enabled)
{
continue;
}
var tokens = line.Split(' ', 2, StringSplitOptions.RemoveEmptyEntries);
if (tokens.Length < 2)
{
ParseWarn();
continue;
}
if (!int.TryParse(tokens[0], System.Globalization.NumberStyles.HexNumber, null, out int offset))
{
ParseWarn();
continue;
}
offset += offset_shift;
if (printValues)
{
Print($"print_values 0x{offset:x} <= {tokens[1]}");
}
if (tokens[1][0] == '"')
{
var patch = Encoding.ASCII.GetBytes(tokens[1].Trim('"'));
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());
}
}
}