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metaforce/gbalink/main.cpp

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#include <stdio.h>
#include "GCNTypes.hpp"
#include <memory>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <fcntl.h>
#include <unistd.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <string>
#include "hecl/hecl.hpp"
namespace net
{
/** IP address class derived from SFML */
class IPAddress
{
uint32_t m_address = 0;
bool m_valid = false;
void resolve(const std::string& address)
{
m_address = 0;
m_valid = false;
if (address == "255.255.255.255")
{
/* The broadcast address needs to be handled explicitly,
* because it is also the value returned by inet_addr on error */
m_address = INADDR_BROADCAST;
m_valid = true;
}
else if (address == "0.0.0.0")
{
m_address = INADDR_ANY;
m_valid = true;
}
else
{
/* Try to convert the address as a byte representation ("xxx.xxx.xxx.xxx") */
uint32_t ip = inet_addr(address.c_str());
if (ip != INADDR_NONE)
{
m_address = ip;
m_valid = true;
}
else
{
/* Not a valid address, try to convert it as a host name */
addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
addrinfo* result = NULL;
if (getaddrinfo(address.c_str(), NULL, &hints, &result) == 0)
{
if (result)
{
ip = reinterpret_cast<sockaddr_in*>(result->ai_addr)->sin_addr.s_addr;
freeaddrinfo(result);
m_address = ip;
m_valid = true;
}
}
}
}
}
public:
IPAddress(const std::string& address)
{
resolve(address);
}
uint32_t toInteger() const
{
return ntohl(m_address);
}
operator bool() const { return m_valid; }
};
/** Server-oriented TCP socket class derived from SFML */
class Socket
{
int m_socket = -1;
bool m_isBlocking;
static sockaddr_in createAddress(uint32_t address, unsigned short port)
{
sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_addr.s_addr = htonl(address);
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
#ifdef __APPLE__
addr.sin_len = sizeof(addr);
#endif
return addr;
}
bool openSocket()
{
if (isOpen())
return false;
m_socket = socket(PF_INET, SOCK_STREAM, 0);
if (m_socket == -1)
{
//err() << "Can't allocate socket" << std::endl;
return false;
}
int one = 1;
setsockopt(m_socket, IPPROTO_TCP, TCP_NODELAY, reinterpret_cast<char*>(&one), sizeof(one));
#ifdef __APPLE__
setsockopt(m_socket, SOL_SOCKET, SO_NOSIGPIPE, reinterpret_cast<char*>(&one), sizeof(one));
#endif
setBlocking(m_isBlocking);
return true;
}
void setRemoteSocket(int remSocket)
{
m_socket = remSocket;
setBlocking(m_isBlocking);
}
public:
Socket(bool blocking)
: m_isBlocking(blocking) {}
~Socket() { close(); }
void setBlocking(bool blocking)
{
int status = fcntl(m_socket, F_GETFL);
if (m_isBlocking)
fcntl(m_socket, F_SETFL, status | ~O_NONBLOCK);
else
fcntl(m_socket, F_SETFL, status | O_NONBLOCK);
}
bool isOpen() const { return m_socket != -1; }
bool openAndListen(const IPAddress& address, uint32_t port)
{
if (!openSocket())
return false;
sockaddr_in addr = createAddress(address.toInteger(), port);
if (bind(m_socket, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) == -1)
{
/* Not likely to happen, but... */
//err() << "Failed to bind listener socket to port " << port << std::endl;
return false;
}
if (::listen(m_socket, 0) == -1)
{
/* Oops, socket is deaf */
//err() << "Failed to listen to port " << port << std::endl;
return false;
}
return true;
}
bool accept(Socket& remoteSocketOut)
{
if (!isOpen())
return false;
/* Accept a new connection */
sockaddr_in address;
socklen_t length = sizeof(address);
int remoteSocket = ::accept(m_socket, reinterpret_cast<sockaddr*>(&address), &length);
/* Check for errors */
if (remoteSocket == -1)
return false;
/* Initialize the new connected socket */
remoteSocketOut.close();
remoteSocketOut.setRemoteSocket(remoteSocket);
return true;
}
void close()
{
if (!isOpen())
return;
::close(m_socket);
m_socket = -1;
}
ssize_t read(void* buf, size_t len)
{
return ::read(m_socket, buf, len);
}
ssize_t write(const void* buf, size_t len)
{
return ::write(m_socket, buf, len);
}
};
}
class CGBASupport
{
public:
enum class EPhase
{
LoadClientPad,
Standby,
StartProbeTimeout,
PollProbe,
StartJoyBusBoot,
PollJoyBusBoot,
DataTransfer,
Complete,
Failed
};
private:
u32 x28_fileSize;
std::unique_ptr<u8[]> x2c_buffer;
EPhase x34_phase = EPhase::LoadClientPad;
float x38_timeout = 0.f;
u8 x3c_status = 0;
u32 x40_siChan = -1;
bool x44_fusionLinked = false;
bool x45_fusionBeat = false;
static CGBASupport* SharedInstance;
public:
CGBASupport(const char* clientPadPath);
~CGBASupport();
bool PollResponse();
void Update(float dt);
bool IsReady();
void InitializeSupport();
void StartLink();
EPhase GetPhase() const { return x34_phase; }
bool IsFusionLinked() const { return x44_fusionLinked; }
bool IsFusionBeat() const { return x45_fusionBeat; }
};
CGBASupport* CGBASupport::SharedInstance;
net::Socket DataServer = {true};
net::Socket DataSocket = {true};
net::Socket ClockServer = {true};
net::Socket ClockSocket = {true};
static u64 GetGCTicks()
{
auto nanos = std::chrono::duration_cast<std::chrono::nanoseconds>(
std::chrono::steady_clock::now().time_since_epoch()).count();
return nanos * 486000000 / 1000000000;
}
#define GBA_JSTAT_MASK 0x3a
#define GBA_JSTAT_FLAGS_SHIFT 4
#define GBA_JSTAT_FLAGS_MASK 0x30
#define GBA_JSTAT_PSF1 0x20
#define GBA_JSTAT_PSF0 0x10
#define GBA_JSTAT_SEND 0x08
#define GBA_JSTAT_RECV 0x02
#define GBA_READY 0
#define GBA_NOT_READY 1
#define GBA_BUSY 2
#define GBA_JOYBOOT_UNKNOWN_STATE 3
#define GBA_JOYBOOT_ERR_INVALID 4
static void GBAInit()
{
DataServer.openAndListen(net::IPAddress("0.0.0.0"), 0xd6ba);
printf("data listening\n");
ClockServer.openAndListen(net::IPAddress("0.0.0.0"), 0xc10c);
printf("clock listening\n");
DataServer.accept(DataSocket);
printf("data accepted\n");
ClockServer.accept(ClockSocket);
printf("clock accepted\n");
}
static s32 GBAGetProcessStatus(s32 chan, u8* percentp)
{
return GBA_READY;
}
static s32 GBAGetStatus(s32 chan, u8* status)
{
return GBA_READY;
}
static s32 GBAReset(s32 chan, u8* status)
{
return GBA_READY;
}
static s32 GBARead(s32 chan, u8* dst, u8* status)
{
return GBA_READY;
}
static s32 GBAWrite(s32 chan, u8* src, u8* status)
{
return GBA_READY;
}
static const u8 KawasedoLUT[] =
{
0x18, 0xFC, 0xC0, 0x80, 0x7F, 0x40, 0x3F, 0x01, 0x00, 0x2F,
0x2F, 0x20, 0x43, 0x6F, 0x64, 0x65, 0x64, 0x20, 0x62, 0x79,
0x20, 0x4B, 0x61, 0x77, 0x61, 0x73, 0x65, 0x64, 0x6F, 0x00,
0x00, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0xAC, 0xC4,
0xF8, 0x08, 0x10, 0xBF, 0x18, 0x00, 0x00, 0x00
};
/** Self-contained class for solving Kawasedo's GBA BootROM challenge.
* GBA will boot client_pad.bin code on completion. */
class CKawasedoChallenge
{
/** DSP-hosted HMAC function
* Reference: https://github.com/dolphin-emu/dolphin/blob/master/Source/Core/Core/HW/DSPHLE/UCodes/GBA.cpp */
struct DSPSecParms
{
union ShortAndLong
{
u16 s[2];
u32 l;
};
ShortAndLong x0_gbaK1; /* Challenge key first read from GBA */
ShortAndLong x4_pColor; /* Palette of Nintendo logo */
ShortAndLong x8_pSpeed; /* Speed of logo pulsing */
u32 xc_progLen; /* Length of program to boot */
//u32* x10_resultsDest; /* Written to resK1 and resK2 instead */
u32 x20_resK1; /* Transformed key */
u32 x24_resMAC; /* Message authentication code */
void ProcessGBACrypto()
{
// 32 bytes from mram addr to DRAM @ 0
x0_gbaK1.l = hecl::SBig(x0_gbaK1.l);
// This is the main decrypt routine
u16 x11 = 0, x12 = 0, x20 = 0, x21 = 0, x22 = 0, x23 = 0;
x20 = hecl::SBig(x0_gbaK1.s[0]) ^ 0x6f64;
x21 = hecl::SBig(x0_gbaK1.s[1]) ^ 0x6573;
s16 unk2 = (s8)x8_pSpeed.s[0];
if (unk2 < 0)
x11 = ((~unk2 + 3) << 1) | (x4_pColor.s[0] << 4);
else if (unk2 == 0)
x11 = (x4_pColor.s[0] << 1) | 0x70;
else // unk2 > 0
x11 = ((unk2 - 1) << 1) | (x4_pColor.s[0] << 4);
s32 rounded_sub = ((xc_progLen + 7) & ~7) - 0x200;
u16 size = (rounded_sub < 0) ? 0 : rounded_sub >> 3;
u32 t = (((size << 16) | 0x3f80) & 0x3f80ffff) << 1;
s16 t_low = (s8)(t >> 8);
t += (t_low & size) << 16;
x12 = t >> 16;
x11 |= (size & 0x4000) >> 14;
t = ((x11 & 0xff) << 16) + ((x12 & 0xff) << 16) + (x12 << 8);
u16 final11 = 0, final12 = 0;
final11 = x11 | ((t >> 8) & 0xff00) | 0x8080;
final12 = x12 | 0x8080;
if ((final12 & 0x200) != 0)
{
x22 = final11 ^ 0x6f64;
x23 = final12 ^ 0x6573;
}
else
{
x22 = final11 ^ 0x6177;
x23 = final12 ^ 0x614b;
}
// Send the result back to mram
x20_resK1 = (x20 << 16) | x21;
x24_resMAC = (x22 << 16) | x23;
}
} xf8_dspHmac;
u32 m_chan;
s32 x0_pColor;
s32 x4_pSpeed;
u8* x8_progPtr;
u32 xc_progLen;
u8* x10_statusPtr;
void* x14_callback;
u8 x18_readBuf[4];
u8 x1c_writeBuf[4];
u32 x20_xfMAC;
u64 x28_ticksAfterXf;
u32 x30_xfDone;
u32 x34_secret;
u32 x38_xfSecret;
u32 x3c_[7];
u32 x58_resK1;
u32 x5c_resMAC;
u32 x60_progChecksum;
u32 x64_intermediateMAC;
bool F23(u8 status)
{
if (status != GBA_READY || GBAReset(m_chan, x10_statusPtr) != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
return true;
}
bool F25(u8 status)
{
if (status != GBA_READY || *x10_statusPtr != KawasedoLUT[0x25] ||
GBAGetStatus(m_chan, x10_statusPtr) != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
return true;
}
bool F27(u8 status)
{
if (status != GBA_READY || *x10_statusPtr != KawasedoLUT[0x0] ||
GBARead(m_chan, x18_readBuf, x10_statusPtr) != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
return true;
}
bool F29(u8 status)
{
if (status != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
return true;
}
void GBAX02()
{
xf8_dspHmac.x0_gbaK1.l = reinterpret_cast<u32&>(x18_readBuf);
xf8_dspHmac.x4_pColor.l = x0_pColor;
xf8_dspHmac.x8_pSpeed.l = x4_pSpeed;
xf8_dspHmac.xc_progLen = xc_progLen;
xf8_dspHmac.ProcessGBACrypto();
}
bool GBAX01()
{
x58_resK1 = xf8_dspHmac.x20_resK1;
x5c_resMAC = xf8_dspHmac.x24_resMAC;
x20_xfMAC = ~KawasedoLUT[0x24] & (KawasedoLUT[0x24] + xc_progLen);
u32 tmp = KawasedoLUT[0x14] << KawasedoLUT[0x21];
if (x20_xfMAC < tmp)
x20_xfMAC = tmp;
x64_intermediateMAC = x20_xfMAC;
x20_xfMAC -= tmp;
x20_xfMAC >>= KawasedoLUT[0x20];
reinterpret_cast<u32&>(x1c_writeBuf) = x5c_resMAC;
x28_ticksAfterXf = GetGCTicks();
x30_xfDone = 1;
if (GBAWrite(m_chan, x1c_writeBuf, x10_statusPtr) != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
return true;
}
bool F31(u8 status)
{
if (status != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
for (;;)
{
if (x30_xfDone)
{
x30_xfDone = 0;
}
else
{
if (!(*x10_statusPtr & KawasedoLUT[0x14]) ||
(*x10_statusPtr & KawasedoLUT[0x2a]) >> KawasedoLUT[0x21] !=
(x34_secret & KawasedoLUT[0x21]) >> KawasedoLUT[0x1f])
return false;
x34_secret -= (KawasedoLUT[0x19] - KawasedoLUT[0x17]);
}
if (x34_secret <= x64_intermediateMAC)
{
u32 checksum;
if (x34_secret != x64_intermediateMAC)
{
x20_xfMAC = KawasedoLUT[0x1d];
checksum = KawasedoLUT[0x1d];
while (x20_xfMAC < KawasedoLUT[0x21])
{
if (xc_progLen)
{
checksum |= *x8_progPtr++ << (x20_xfMAC * KawasedoLUT[0x25]);
--xc_progLen;
}
}
if (x34_secret == KawasedoLUT[0x26])
{
x60_progChecksum = checksum;
}
else if (KawasedoLUT[0x27] == x34_secret)
{
checksum = m_chan << KawasedoLUT[0x25];
}
if (x34_secret >= KawasedoLUT[0x2])
{
u32 checksum2 = checksum;
u32 tmp = KawasedoLUT[0x14];
u32 tmpSecret = x38_xfSecret;
u32 xorTerm = (KawasedoLUT[0x26] << 8) +
(((KawasedoLUT[0x2b] - (KawasedoLUT[0x2b] << 4)) +
KawasedoLUT[0x28]) - KawasedoLUT[0x23]);
while (tmp > KawasedoLUT[0x1e])
{
if (checksum2 ^ tmpSecret)
tmpSecret = (tmpSecret >> 1) ^ xorTerm;
else
tmpSecret >>= 1;
++checksum2;
--tmp;
}
x38_xfSecret = tmpSecret;
}
if (x34_secret == KawasedoLUT[0x28] + 256)
{
x3c_[0] = checksum;
}
else if (x34_secret == KawasedoLUT[0x1] + 256)
{
x20_xfMAC = KawasedoLUT[0x7];
x3c_[x20_xfMAC] = checksum;
}
}
else
{
checksum = x38_xfSecret | x34_secret << 16;
}
if (x34_secret > KawasedoLUT[0x2b])
{
x58_resK1 = ((KawasedoLUT[0x18] << KawasedoLUT[0x25]) | KawasedoLUT[0x15] |
(KawasedoLUT[0x18] << KawasedoLUT[0x2c]) | (KawasedoLUT[0x17] << KawasedoLUT[0x2a])) *
x58_resK1 - (KawasedoLUT[0x1b] - KawasedoLUT[0x1a]);
checksum ^= x58_resK1;
checksum ^= -((KawasedoLUT[0xb] << 20) + x34_secret);
checksum ^= KawasedoLUT[0xb] | (KawasedoLUT[0x13] << 8) | (KawasedoLUT[0x12] << 16);
}
x1c_writeBuf[3] = checksum >> KawasedoLUT[0x0];
x1c_writeBuf[0] = checksum >> KawasedoLUT[0x1e];
x1c_writeBuf[1] = checksum >> KawasedoLUT[0x29];
x1c_writeBuf[2] = checksum >> KawasedoLUT[0x2a];
if (x34_secret == KawasedoLUT[0x1] + KawasedoLUT[0x1])
x3c_[2] = checksum;
if (x20_xfMAC < KawasedoLUT[0x21])
{
x3c_[(3 - (1 - x20_xfMAC))] = checksum;
x3c_[5 - x20_xfMAC] = x3c_[(2 - (1 - x20_xfMAC))] * x3c_[4 - x20_xfMAC];
x3c_[(5 - (1 - x20_xfMAC))] = x3c_[(2 - (1 - x20_xfMAC))] * x3c_[1 - x20_xfMAC];
x3c_[7 - x20_xfMAC] = x3c_[-(1 - x20_xfMAC)] * x3c_[4 - x20_xfMAC];
}
if (GBAWrite(m_chan, x1c_writeBuf, x10_statusPtr) != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
continue;
}
else // x34_secret > x64_intermediateMAC
{
if (GBARead(m_chan, x18_readBuf, x10_statusPtr) != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
}
break;
}
return true;
}
bool F33(u8 status)
{
if (status != GBA_READY ||
GBAGetStatus(m_chan, x10_statusPtr) != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
return true;
}
bool F35(u8 status)
{
for (;;)
{
if (status != GBA_READY || (*x10_statusPtr & (GBA_JSTAT_FLAGS_MASK | GBA_JSTAT_RECV)))
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
if (*x10_statusPtr == GBA_JSTAT_SEND)
{
if (GBAGetStatus(m_chan, x10_statusPtr) != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
continue;
}
if (GBARead(m_chan, x18_readBuf, x10_statusPtr) != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
break;
}
return true;
}
bool F37(u8 status)
{
if (status != GBA_READY ||
GBAWrite(m_chan, x18_readBuf, x10_statusPtr) != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
return true;
}
bool F39(u8 status)
{
if (status != GBA_READY)
{
x28_ticksAfterXf = 0;
x14_callback = nullptr;
return false;
}
x28_ticksAfterXf = 0;
return true;
}
public:
CKawasedoChallenge(u32 chan, s32 paletteColor, s32 paletteSpeed,
u8* programp, s32 length, u8* status)
: m_chan(chan), x0_pColor(paletteColor),
x4_pSpeed(paletteSpeed), x8_progPtr(programp),
xc_progLen(length), x10_statusPtr(status)
{
x34_secret = KawasedoLUT[0x8];
}
bool DoChallenge()
{
if (GBAGetStatus(m_chan, x10_statusPtr) != GBA_READY)
{
x14_callback = nullptr;
return false;
}
if (!F23(*x10_statusPtr))
return false;
if (!F25(*x10_statusPtr))
return false;
if (!F27(*x10_statusPtr))
return false;
if (!F29(*x10_statusPtr))
return false;
GBAX02();
if (!GBAX01())
return false;
if (!F31(*x10_statusPtr))
return false;
if (!F33(*x10_statusPtr))
return false;
if (!F35(*x10_statusPtr))
return false;
if (!F37(*x10_statusPtr))
return false;
if (!F39(*x10_statusPtr))
return false;
return true;
}
};
static s32 GBAJoyBootAsync(s32 chan, s32 paletteColor, s32 paletteSpeed,
u8* programp, s32 length, u8* status)
{
if (chan > 3)
return GBA_JOYBOOT_ERR_INVALID;
if (!length || length >= 0x40000)
return GBA_JOYBOOT_ERR_INVALID;
if (paletteSpeed < -4 || paletteSpeed > 4)
return GBA_JOYBOOT_ERR_INVALID;
if (paletteColor < 0 || paletteColor > 6)
return GBA_JOYBOOT_ERR_INVALID;
if (programp[0xac] * programp[0xac] * programp[0xac] * programp[0xac] == 0)
return GBA_JOYBOOT_ERR_INVALID;
u8 tmpStatus;
s32 ret = GBAGetProcessStatus(chan, &tmpStatus);
if (ret != GBA_READY)
return ret;
CKawasedoChallenge challenge(chan, paletteColor, paletteSpeed, programp, length, status);
challenge.DoChallenge();
return GBA_READY;
}
static u32 calculateJBusChecksum(const u8* data, size_t len)
{
const u8* ptr = data;
u32 sum = -1;
for (int i = len ; i > 0; --i)
{
u8 ch = *ptr;
ptr++;
sum ^= ch;
for (int j = 0; j < 8; ++j)
{
if ((sum & 1))
{
sum >>= 1;
sum ^= 0xb010;
}
else
sum >>= 1;
}
}
return sum;
}
CGBASupport::CGBASupport(const char* clientPadPath)
{
FILE* fp = fopen(clientPadPath, "rb");
if (!fp)
{
fprintf(stderr, "No file at %s\n", clientPadPath);
exit(1);
}
fseek(fp, 0, SEEK_END);
x28_fileSize = ftell(fp);
fseek(fp, 0, SEEK_SET);
x2c_buffer.reset(new u8[x28_fileSize]);
fread(x2c_buffer.get(), 1, x28_fileSize, fp);
fclose(fp);
GBAInit();
SharedInstance = this;
}
CGBASupport::~CGBASupport()
{
SharedInstance = nullptr;
}
bool CGBASupport::PollResponse()
{
u8 status;
if (GBAReset(x40_siChan, &status) == GBA_NOT_READY)
if (GBAReset(x40_siChan, &status) == GBA_NOT_READY)
return false;
if (GBAGetStatus(x40_siChan, &status) == GBA_NOT_READY)
return false;
if (status != (GBA_JSTAT_PSF1 | GBA_JSTAT_SEND))
return false;
u8 bytes[4];
if (GBARead(x40_siChan, bytes, &status) == GBA_NOT_READY)
return false;
if (reinterpret_cast<u32&>(bytes) != SBIG('AMTE'))
return false;
if (GBAGetStatus(x40_siChan, &status) == GBA_NOT_READY)
return false;
if (status != GBA_JSTAT_PSF1)
return false;
if (GBAWrite(x40_siChan, (unsigned char*)"AMTE", &status) == GBA_NOT_READY)
return false;
if (GBAGetStatus(x40_siChan, &status) == GBA_NOT_READY)
return false;
if ((status & GBA_JSTAT_FLAGS_MASK) != GBA_JSTAT_FLAGS_MASK)
return false;
u64 profStart = GetGCTicks();
const u64 timeToSpin = 486000000 / 8000;
for (;;)
{
u64 curTime = GetGCTicks();
if (curTime - profStart > timeToSpin)
return true;
if (GBAGetStatus(x40_siChan, &status) == GBA_NOT_READY)
continue;
if (!(status & GBA_JSTAT_SEND))
continue;
if (GBAGetStatus(x40_siChan, &status) == GBA_NOT_READY)
continue;
if (status != (GBA_JSTAT_FLAGS_MASK | GBA_JSTAT_SEND))
continue;
break;
}
if (GBARead(x40_siChan, bytes, &status) != GBA_READY)
return false;
u32 swapped = hecl::SBig(reinterpret_cast<u32&>(bytes));
if (bytes[0] != calculateJBusChecksum(reinterpret_cast<u8*>(&swapped), 3))
return false;
x44_fusionLinked = (bytes[2] & 0x2) != 0;
if (x44_fusionLinked && (bytes[2] & 0x1) != 0)
x45_fusionBeat = true;
return true;
}
void CGBASupport::Update(float dt)
{
switch (x34_phase)
{
case EPhase::LoadClientPad:
IsReady();
break;
case EPhase::StartProbeTimeout:
x38_timeout = 4.f;
x34_phase = EPhase::PollProbe;
case EPhase::PollProbe:
/* SIProbe poll normally occurs here with 4 second timeout */
x40_siChan = 1;
x34_phase = EPhase::StartJoyBusBoot;
case EPhase::StartJoyBusBoot:
x34_phase = EPhase::PollJoyBusBoot;
GBAJoyBootAsync(x40_siChan, x40_siChan * 2, 2, x2c_buffer.get(), x28_fileSize, &x3c_status);
break;
case EPhase::PollJoyBusBoot:
if (GBAGetProcessStatus(x40_siChan, &x3c_status) == GBA_BUSY)
break;
if (GBAGetStatus(x40_siChan, &x3c_status) == GBA_NOT_READY)
{
x34_phase = EPhase::Failed;
break;
}
x38_timeout = 4.f;
x34_phase = EPhase::DataTransfer;
break;
case EPhase::DataTransfer:
if (PollResponse())
{
x34_phase = EPhase::Complete;
break;
}
x38_timeout = std::max(0.f, x38_timeout - dt);
if (x38_timeout == 0.f)
x34_phase = EPhase::Failed;
break;
default: break;
}
}
bool CGBASupport::IsReady()
{
if (x34_phase != EPhase::LoadClientPad)
return true;
x34_phase = EPhase::Standby;
/* Conveniently already little-endian */
reinterpret_cast<u32&>(x2c_buffer[0xc8]) = u32(GetGCTicks());
x2c_buffer[0xaf] = 'E';
x2c_buffer[0xbd] = 0xc9;
return true;
}
void CGBASupport::InitializeSupport()
{
x34_phase = EPhase::Standby;
x38_timeout = 0.f;
x3c_status = false;
x40_siChan = -1;
x44_fusionLinked = false;
x45_fusionBeat = false;
}
void CGBASupport::StartLink()
{
x34_phase = EPhase::StartProbeTimeout;
x40_siChan = -1;
}
int main(int argc, char** argv)
{
CGBASupport gba("client_pad.bin");
gba.InitializeSupport();
gba.StartLink();
}
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