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kabufuda
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Prevent garbage data from being written to memcard

This commit is contained in:
Phillip Stephens 2019-06-02 20:31:57 -07:00
parent 630119350b
commit da4008bf50
2 changed files with 28 additions and 26 deletions
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34
include/kabufuda/Card.hpp
View File

@ -78,24 +78,26 @@ struct CardStat {
class Card {
#pragma pack(push, 4)
struct CardHeader {
uint8_t m_serial[12];
uint64_t m_formatTime;
int32_t m_sramBias;
uint32_t m_sramLanguage;
uint32_t m_unknown;
uint16_t m_deviceId; /* 0 for Slot A, 1 for Slot B */
uint16_t m_sizeMb;
uint16_t m_encoding;
uint8_t __padding[468];
uint16_t m_updateCounter;
uint16_t m_checksum;
uint16_t m_checksumInv;
union {
struct {
uint8_t m_serial[12];
uint64_t m_formatTime;
int32_t m_sramBias;
uint32_t m_sramLanguage;
uint32_t m_unknown;
uint16_t m_deviceId; /* 0 for Slot A, 1 for Slot B */
uint16_t m_sizeMb;
uint16_t m_encoding;
uint8_t __padding[468];
uint16_t m_updateCounter;
uint16_t m_checksum;
uint16_t m_checksumInv;
};
uint8_t __raw[BlockSize];
};
void _swapEndian();
};
union {
CardHeader m_ch;
uint8_t __raw[BlockSize];
};
CardHeader m_ch;
CardHeader m_tmpCh;
#pragma pack(pop)

20
lib/kabufuda/Card.cpp
View File

@ -24,10 +24,10 @@ void Card::CardHeader::_swapEndian() {
m_checksumInv = SBig(m_checksumInv);
}
Card::Card() { memset(__raw, 0xFF, BlockSize); }
Card::Card() { memset(m_ch.__raw, 0xFF, BlockSize); }
Card::Card(Card&& other) {
memmove(__raw, other.__raw, BlockSize);
memmove(m_ch.__raw, other.m_ch.__raw, BlockSize);
m_filename = std::move(other.m_filename);
m_fileHandle = std::move(other.m_fileHandle);
m_dirs[0] = std::move(other.m_dirs[0]);
@ -45,7 +45,7 @@ Card::Card(Card&& other) {
Card& Card::operator=(Card&& other) {
close();
memmove(__raw, other.__raw, BlockSize);
memmove(m_ch.__raw, other.m_ch.__raw, BlockSize);
m_filename = std::move(other.m_filename);
m_fileHandle = std::move(other.m_fileHandle);
m_dirs[0] = std::move(other.m_dirs[0]);
@ -107,7 +107,7 @@ ECardResult Card::_pumpOpen() {
}
Card::Card(const char* game, const char* maker) {
memset(__raw, 0xFF, BlockSize);
memset(m_ch.__raw, 0xFF, BlockSize);
if (game && strlen(game) == 4)
memcpy(m_game, game, 4);
if (maker && strlen(maker) == 2)
@ -164,7 +164,7 @@ void Card::_updateDirAndBat(const Directory& dir, const BlockAllocationTable& ba
void Card::_updateChecksum() {
m_ch._swapEndian();
calculateChecksumBE(reinterpret_cast<uint16_t*>(__raw), 0xFE, &m_ch.m_checksum, &m_ch.m_checksumInv);
calculateChecksumBE(reinterpret_cast<uint16_t*>(m_ch.__raw), 0xFE, &m_ch.m_checksum, &m_ch.m_checksumInv);
m_ch._swapEndian();
}
@ -726,7 +726,7 @@ void Card::getSerial(uint64_t& serial) {
m_ch._swapEndian();
uint32_t serialBuf[8];
for (uint32_t i = 0; i < 8; i++)
serialBuf[i] = SBig(*reinterpret_cast<uint32_t*>(__raw + (i * 4)));
serialBuf[i] = SBig(*reinterpret_cast<uint32_t*>(m_ch.__raw + (i * 4)));
serial = uint64_t(serialBuf[0] ^ serialBuf[2] ^ serialBuf[4] ^ serialBuf[6]) << 32 |
(serialBuf[1] ^ serialBuf[3] ^ serialBuf[5] ^ serialBuf[7]);
m_ch._swapEndian();
@ -745,7 +745,7 @@ void Card::getFreeBlocks(int32_t& bytesNotUsed, int32_t& filesNotUsed) {
static std::unique_ptr<uint8_t[]> DummyBlock;
void Card::format(ECardSlot id, ECardSize size, EEncoding encoding) {
memset(__raw, 0xFF, BlockSize);
memset(m_ch.__raw, 0xFF, BlockSize);
uint64_t rand = uint64_t(getGCTime());
m_ch.m_formatTime = rand;
for (int i = 0; i < 12; i++) {
@ -779,7 +779,7 @@ void Card::format(ECardSlot id, ECardSize size, EEncoding encoding) {
m_tmpCh = m_ch;
m_tmpCh._swapEndian();
m_fileHandle.resizeQueue(5 + blockCount);
m_fileHandle.asyncWrite(0, &m_tmpCh, BlockSize, 0);
m_fileHandle.asyncWrite(0, &m_tmpCh.__raw, BlockSize, 0);
m_tmpDirs[0] = m_dirs[0];
m_tmpDirs[0].swapEndian();
m_fileHandle.asyncWrite(1, m_tmpDirs[0].__raw, BlockSize, BlockSize * 1);
@ -842,7 +842,7 @@ bool Card::open(SystemStringView filepath) {
m_fileHandle = AsyncIO(m_filename);
if (m_fileHandle) {
m_fileHandle.resizeQueue(5);
if (!m_fileHandle.asyncRead(0, __raw, BlockSize, 0))
if (!m_fileHandle.asyncRead(0, m_ch.__raw, BlockSize, 0))
return false;
if (!m_fileHandle.asyncRead(1, m_dirs[0].__raw, BlockSize, BlockSize * 1))
return false;
@ -880,7 +880,7 @@ ECardResult Card::getError() const {
uint16_t ckSum, ckSumInv;
const_cast<Card&>(*this).m_ch._swapEndian();
calculateChecksumBE(reinterpret_cast<const uint16_t*>(__raw), 0xFE, &ckSum, &ckSumInv);
calculateChecksumBE(reinterpret_cast<const uint16_t*>(m_ch.__raw), 0xFE, &ckSum, &ckSumInv);
bool res = (ckSum == m_ch.m_checksum && ckSumInv == m_ch.m_checksumInv);
const_cast<Card&>(*this).m_ch._swapEndian();