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System: Add helpers for reading executables off discs

This commit is contained in:
Connor McLaughlin 2021-02-21 16:53:29 +10:00
parent 7501e89b7a
commit 229ed5a852
2 changed files with 70 additions and 18 deletions
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85
src/core/system.cpp
View File

@ -395,10 +395,32 @@ std::string GetGameCodeForPath(const char* image_path)
std::string GetGameCodeForImage(CDImage* cdi)
{
ISOReader iso;
if (!iso.Open(cdi, 1))
std::string code(GetExecutableNameForImage(cdi));
if (code.empty())
return {};
// SCES_123.45 -> SCES-12345
for (std::string::size_type pos = 0; pos < code.size();)
{
if (code[pos] == '.')
{
code.erase(pos, 1);
continue;
}
if (code[pos] == '_')
code[pos] = '-';
else
code[pos] = static_cast<char>(std::toupper(code[pos]));
pos++;
}
return code;
}
static std::string GetExecutableNameForImage(CDImage* cdi, ISOReader& iso)
{
// Read SYSTEM.CNF
std::vector<u8> system_cnf_data;
if (!iso.ReadFile("SYSTEM.CNF", &system_cnf_data))
@ -461,28 +483,55 @@ std::string GetGameCodeForImage(CDImage* cdi)
code.erase(0, pos + 1);
}
pos = code.find(';');
// strip off ; or version number
pos = code.rfind(';');
if (pos != std::string::npos)
code.erase(pos);
// SCES_123.45 -> SCES-12345
for (pos = 0; pos < code.size();)
return code;
}
std::string GetExecutableNameForImage(CDImage* cdi)
{
ISOReader iso;
if (!iso.Open(cdi, 1))
return {};
return GetExecutableNameForImage(cdi, iso);
}
bool ReadExecutableFromImage(CDImage* cdi, std::string* out_executable_name, std::vector<u8>* out_executable_data)
{
ISOReader iso;
if (!iso.Open(cdi, 1))
return false;
bool result = false;
std::string executable_name(GetExecutableNameForImage(cdi, iso));
if (!executable_name.empty())
{
if (code[pos] == '.')
{
code.erase(pos, 1);
continue;
}
if (code[pos] == '_')
code[pos] = '-';
else
code[pos] = static_cast<char>(std::toupper(code[pos]));
pos++;
result = iso.ReadFile(executable_name.c_str(), out_executable_data);
if (!result)
Log_ErrorPrintf("Failed to read executable '%s' from disc", executable_name.c_str());
}
return code;
if (!result)
{
// fallback to PSX.EXE
executable_name = "PSX.EXE";
result = iso.ReadFile(executable_name.c_str(), out_executable_data);
if (!result)
Log_ErrorPrint("Failed to read fallback PSX.EXE from disc");
}
if (!result)
return false;
if (out_executable_name)
*out_executable_name = std::move(executable_name);
return true;
}
DiscRegion GetRegionForCode(std::string_view code)

3
src/core/system.h
View File

@ -75,6 +75,9 @@ std::vector<std::string> ParseM3UFile(const char* path);
/// Returns the preferred console type for a disc.
ConsoleRegion GetConsoleRegionForDiscRegion(DiscRegion region);
std::string GetExecutableNameForImage(CDImage* cdi);
bool ReadExecutableFromImage(CDImage* cdi, std::string* out_executable_name, std::vector<u8>* out_executable_data);
std::string GetGameCodeForImage(CDImage* cdi);
std::string GetGameCodeForPath(const char* image_path);
DiscRegion GetRegionForCode(std::string_view code);