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Further work on support for cheats

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Cheats can now be enabled/disabled and games can be launched with cheats
This commit is contained in:
Gericom
2026-02-28 17:00:02 +01:00
parent dddee0bb94
commit f54a379ff2
27 changed files with 660 additions and 171 deletions
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81
arm9/source/cheats/UsrCheatRepository.cpp
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@@ -3,6 +3,68 @@
#include <string.h>
#include "UsrCheatRepository.h"
#define CRCPOLY 0xEDB88320
static u32 crc32(const void* buffer, u32 length)
{
u32 crc = ~0u;
const u8* p = (u8*)buffer;
while (length--)
{
crc ^= *p++;
for (int i = 0; i < 8; i++)
{
crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY : 0);
}
}
return crc;
}
std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(const FastFileRef& romFile) const
{
auto file = std::make_unique<File>();
file->Open(romFile, FA_READ);
auto headerBuffer = std::make_unique_for_overwrite<u8[]>(512);
if (!file->ReadExact(headerBuffer.get(), 512))
{
LOG_ERROR("Could not read rom header\n");
return nullptr;
}
file->Close();
u32 gameCode = *(u32*)(headerBuffer.get() + 0xC);
u32 crc = crc32(headerBuffer.get(), 512);
headerBuffer.reset();
return GetCheatsForGame(gameCode, crc);
}
void UsrCheatRepository::UpdateEnabledCheatsForGame(const std::unique_ptr<GameCheats>& cheats) const
{
u32 cheatDataLength = 0;
auto cheatData = cheats->GetCheatData(cheatDataLength);
if (_usrCheatFile->Seek(cheats->GetFileOffset()) != FR_OK)
{
LOG_ERROR("Failed to seek to cheat data\n");
return;
}
u32 bytesWritten = 0;
if (_usrCheatFile->Write(cheatData, cheatDataLength, bytesWritten) != FR_OK ||
bytesWritten != cheatDataLength)
{
LOG_ERROR("Failed to write cheat data\n");
return;
}
if (_usrCheatFile->Sync() != FR_OK)
{
LOG_ERROR("Failed to flush cheat data\n");
}
}
std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(u32 gameCode, u32 headerCrc32) const
{
auto index = FindIndex(gameCode, headerCrc32);
@@ -14,13 +76,14 @@ std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(u32 gameCode, u
return nullptr;
}
auto cheatData = std::make_unique_for_overwrite<u8[]>(index->padding); // padding was set to the size in UsrCheatRepositoryFactory
const u32 cheatDataLength = index->padding; // padding was set to the size in UsrCheatRepositoryFactory
auto cheatData = std::make_unique_for_overwrite<u8[]>(cheatDataLength);
if (_usrCheatFile->Seek(index->offset) != FR_OK)
{
LOG_ERROR("Failed to seek to cheat data\n");
return nullptr;
}
if (!_usrCheatFile->ReadExact(cheatData.get(), index->padding))
if (!_usrCheatFile->ReadExact(cheatData.get(), cheatDataLength))
{
LOG_ERROR("Failed to read cheat data\n");
return nullptr;
@@ -38,7 +101,7 @@ std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(u32 gameCode, u
// flags
u32 flags = *(u32*)ptr;
u32 totalNumberOfItems = flags & 0x0FFFFFFF;
u32 gameActive = flags >> 28;
// u32 gameActive = flags >> 28;
ptr += 4;
// master codes
@@ -50,7 +113,7 @@ std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(u32 gameCode, u
auto cheats = (Cheat*)malloc(totalNumberOfItems * sizeof(Cheat));
u32 cheatCount = 0;
while (ptr < cheatData.get() + index->padding)
while (ptr < cheatData.get() + cheatDataLength)
{
u32 itemFlags = *(u32*)ptr;
bool isCategory = ((itemFlags >> 28) & 1) == 1;
@@ -69,7 +132,8 @@ std::unique_ptr<GameCheats> UsrCheatRepository::GetCheatsForGame(u32 gameCode, u
categories = (CheatCategory*)realloc(categories, categoryCount * sizeof(CheatCategory));
cheats = (Cheat*)realloc(cheats, cheatCount * sizeof(Cheat));
return std::make_unique<GameCheats>(std::move(cheatData), gameName, categories, categoryCount, cheats, cheatCount);
return std::make_unique<GameCheats>(
std::move(cheatData), cheatDataLength, index->offset, gameName, categories, categoryCount, cheats, cheatCount);
}
const usr_cheat_index_entry_t* UsrCheatRepository::FindIndex(u32 gameCode, u32 headerCrc32) const
@@ -142,15 +206,14 @@ void UsrCheatRepository::ParseCategory(CheatCategory& category, u8*& ptr) const
categories = (CheatCategory*)realloc(categories, categoryCount * sizeof(CheatCategory));
cheats = (Cheat*)realloc(cheats, cheatCount * sizeof(Cheat));
category = CheatCategory(itemName, itemDescription, isMaxOneCheatActive, categories, categoryCount, cheats, cheatCount);
new (&category) CheatCategory (itemName, itemDescription, isMaxOneCheatActive, categories, categoryCount, cheats, cheatCount);
}
void UsrCheatRepository::ParseCheat(Cheat& cheat, u8*& ptr) const
{
// flags
u32 itemFlags = *(u32*)ptr;
u32* flagsPtr = (u32*)ptr;
ptr += 4;
bool isCheatActive = ((itemFlags >> 24) & 1) == 1;
// item name
const char* itemName = (const char*)ptr;
@@ -167,7 +230,7 @@ void UsrCheatRepository::ParseCheat(Cheat& cheat, u8*& ptr) const
u32 numberOfCodeWords = *(u32*)ptr;
ptr += 4;
cheat = Cheat(itemName, itemDescription, isCheatActive, ptr, numberOfCodeWords * 4);
new (&cheat) Cheat(itemName, itemDescription, flagsPtr, ptr, numberOfCodeWords * 4);
// code
ptr += numberOfCodeWords * 4;