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GCMemcard.cpp
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GCMemcard.cpp
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// Copyright 2008 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "Core/HW/GCMemcard/GCMemcard.h"
#include <algorithm>
#include <cassert>
#include <cinttypes>
#include <cstring>
#include <vector>
#include "Common/BitUtils.h"
#include "Common/ColorUtil.h"
#include "Common/CommonFuncs.h"
#include "Common/CommonPaths.h"
#include "Common/CommonTypes.h"
#include "Common/File.h"
#include "Common/MsgHandler.h"
#include "Common/StringUtil.h"
#include "Common/Swap.h"
static void ByteSwap(u8* valueA, u8* valueB)
{
u8 tmp = *valueA;
*valueA = *valueB;
*valueB = tmp;
}
static constexpr std::optional<u64> BytesToMegabits(u64 bytes)
{
const u64 factor = ((1024 * 1024) / 8);
const u64 megabits = bytes / factor;
const u64 remainder = bytes % factor;
if (remainder != 0)
return std::nullopt;
return megabits;
}
bool GCMemcardErrorCode::HasCriticalErrors() const
{
return Test(GCMemcardValidityIssues::FAILED_TO_OPEN) || Test(GCMemcardValidityIssues::IO_ERROR) ||
Test(GCMemcardValidityIssues::INVALID_CARD_SIZE) ||
Test(GCMemcardValidityIssues::INVALID_CHECKSUM) ||
Test(GCMemcardValidityIssues::MISMATCHED_CARD_SIZE) ||
Test(GCMemcardValidityIssues::FREE_BLOCK_MISMATCH) ||
Test(GCMemcardValidityIssues::DIR_BAT_INCONSISTENT);
}
bool GCMemcardErrorCode::Test(GCMemcardValidityIssues code) const
{
return m_errors.test(static_cast<size_t>(code));
}
void GCMemcardErrorCode::Set(GCMemcardValidityIssues code)
{
m_errors.set(static_cast<size_t>(code));
}
GCMemcardErrorCode& GCMemcardErrorCode::operator|=(const GCMemcardErrorCode& other)
{
this->m_errors |= other.m_errors;
return *this;
}
GCMemcard::GCMemcard()
: m_valid(false), m_size_blocks(0), m_size_mb(0), m_active_directory(0), m_active_bat(0)
{
}
std::optional<GCMemcard> GCMemcard::Create(std::string filename, u16 size_mbits, bool shift_jis)
{
GCMemcard card;
card.m_filename = std::move(filename);
// TODO: Format() not only formats the card but also writes it to disk at m_filename.
// Those tasks should probably be separated.
if (!card.Format(shift_jis, size_mbits))
return std::nullopt;
return std::move(card);
}
std::pair<GCMemcardErrorCode, std::optional<GCMemcard>> GCMemcard::Open(std::string filename)
{
GCMemcardErrorCode error_code;
File::IOFile file(filename, "rb");
if (!file.IsOpen())
{
error_code.Set(GCMemcardValidityIssues::FAILED_TO_OPEN);
return std::make_pair(error_code, std::nullopt);
}
// check if the filesize is a valid memory card size
const u64 filesize = file.GetSize();
const u64 filesize_megabits = BytesToMegabits(filesize).value_or(0);
const std::array<u16, 6> valid_megabits = {{
MBIT_SIZE_MEMORY_CARD_59,
MBIT_SIZE_MEMORY_CARD_123,
MBIT_SIZE_MEMORY_CARD_251,
MBIT_SIZE_MEMORY_CARD_507,
MBIT_SIZE_MEMORY_CARD_1019,
MBIT_SIZE_MEMORY_CARD_2043,
}};
if (!std::any_of(valid_megabits.begin(), valid_megabits.end(),
[filesize_megabits](u64 mbits) { return mbits == filesize_megabits; }))
{
error_code.Set(GCMemcardValidityIssues::INVALID_CARD_SIZE);
return std::make_pair(error_code, std::nullopt);
}
const u16 card_size_mbits = static_cast<u16>(filesize_megabits);
// read the entire card into memory
GCMemcard card;
file.Seek(0, SEEK_SET);
if (!file.ReadBytes(&card.m_header_block, BLOCK_SIZE) ||
!file.ReadBytes(&card.m_directory_blocks[0], BLOCK_SIZE) ||
!file.ReadBytes(&card.m_directory_blocks[1], BLOCK_SIZE) ||
!file.ReadBytes(&card.m_bat_blocks[0], BLOCK_SIZE) ||
!file.ReadBytes(&card.m_bat_blocks[1], BLOCK_SIZE))
{
error_code.Set(GCMemcardValidityIssues::IO_ERROR);
return std::make_pair(error_code, std::nullopt);
}
const u16 card_size_blocks = card_size_mbits * MBIT_TO_BLOCKS;
const u16 user_data_blocks = card_size_blocks - MC_FST_BLOCKS;
card.m_data_blocks.reserve(user_data_blocks);
for (u16 i = 0; i < user_data_blocks; ++i)
{
GCMBlock& block = card.m_data_blocks.emplace_back();
if (!file.ReadArray(block.m_block.data(), BLOCK_SIZE))
{
error_code.Set(GCMemcardValidityIssues::IO_ERROR);
return std::make_pair(error_code, std::nullopt);
}
}
file.Close();
card.m_filename = std::move(filename);
card.m_size_blocks = card_size_blocks;
card.m_size_mb = card_size_mbits;
// can return invalid card size, invalid checksum, data in unused area
// data in unused area is okay, otherwise fail
const GCMemcardErrorCode header_error_code = card.m_header_block.CheckForErrors(card_size_mbits);
error_code |= header_error_code;
if (header_error_code.HasCriticalErrors())
return std::make_pair(error_code, std::nullopt);
// The GC BIOS counts any card as corrupted as long as at least any two of [dir0, dir1, bat0,
// bat1] are corrupted. Yes, even if we have one valid dir and one valid bat, and even if those
// are both supposedly the newer ones.
//
// If both blocks of a single category are non-corrupted the used block depends on the update
// counter. If both blocks have the same update counter, it prefers block 0. Otherwise it prefers
// whichever block has the higher value. Essentially, if (0.update_ctr >= 1.update_ctr) { use 0 }
// else { use 1 }.
//
// If a single block of the four is corrupted, the non-corrupted one of the same category is
// immediately copied over the corrupted block with an incremented update counter. At this point
// both blocks contain the same data, so it's hard to tell which one is used, but presumably it
// uses the one with the now-higher update counter, same as it would have otherwise.
//
// This rule only applies for errors within a single block! That is, invalid checksums for both
// types, and free block mismatch for the BATs. Once two valid blocks have been selected but it
// later turns out they do not match eachother (eg. claimed block count of a file in the directory
// does not match the actual block count arrived at by following BAT), the card will be treated as
// corrupted, even if perhaps a different combination of the two blocks would result in a valid
// memory card.
// can return invalid checksum, data in unused area
GCMemcardErrorCode dir_block_0_error_code = card.m_directory_blocks[0].CheckForErrors();
GCMemcardErrorCode dir_block_1_error_code = card.m_directory_blocks[1].CheckForErrors();
// can return invalid card size, invalid checksum, data in unused area, free block mismatch
GCMemcardErrorCode bat_block_0_error_code = card.m_bat_blocks[0].CheckForErrors(card_size_mbits);
GCMemcardErrorCode bat_block_1_error_code = card.m_bat_blocks[1].CheckForErrors(card_size_mbits);
const bool dir_block_0_valid = !dir_block_0_error_code.HasCriticalErrors();
const bool dir_block_1_valid = !dir_block_1_error_code.HasCriticalErrors();
const bool bat_block_0_valid = !bat_block_0_error_code.HasCriticalErrors();
const bool bat_block_1_valid = !bat_block_1_error_code.HasCriticalErrors();
// if any two (at least) blocks are corrupted return failure
// TODO: Consider allowing a recovery option when there's still a valid one of each type.
int number_of_corrupted_dir_bat_blocks = 0;
if (!dir_block_0_valid)
++number_of_corrupted_dir_bat_blocks;
if (!dir_block_1_valid)
++number_of_corrupted_dir_bat_blocks;
if (!bat_block_0_valid)
++number_of_corrupted_dir_bat_blocks;
if (!bat_block_1_valid)
++number_of_corrupted_dir_bat_blocks;
if (number_of_corrupted_dir_bat_blocks > 1)
{
error_code |= dir_block_0_error_code;
error_code |= dir_block_1_error_code;
error_code |= bat_block_0_error_code;
error_code |= bat_block_1_error_code;
return std::make_pair(error_code, std::nullopt);
}
// if exactly one block is corrupted copy and update it over the non-corrupted block
if (number_of_corrupted_dir_bat_blocks == 1)
{
if (!dir_block_0_valid)
{
card.m_directory_blocks[0] = card.m_directory_blocks[1];
card.m_directory_blocks[0].m_update_counter = card.m_directory_blocks[0].m_update_counter + 1;
card.m_directory_blocks[0].FixChecksums();
dir_block_0_error_code = card.m_directory_blocks[0].CheckForErrors();
}
else if (!dir_block_1_valid)
{
card.m_directory_blocks[1] = card.m_directory_blocks[0];
card.m_directory_blocks[1].m_update_counter = card.m_directory_blocks[1].m_update_counter + 1;
card.m_directory_blocks[1].FixChecksums();
dir_block_1_error_code = card.m_directory_blocks[1].CheckForErrors();
}
else if (!bat_block_0_valid)
{
card.m_bat_blocks[0] = card.m_bat_blocks[1];
card.m_bat_blocks[0].m_update_counter = card.m_bat_blocks[0].m_update_counter + 1;
card.m_bat_blocks[0].FixChecksums();
bat_block_0_error_code = card.m_bat_blocks[0].CheckForErrors(card_size_mbits);
}
else if (!bat_block_1_valid)
{
card.m_bat_blocks[1] = card.m_bat_blocks[0];
card.m_bat_blocks[1].m_update_counter = card.m_bat_blocks[1].m_update_counter + 1;
card.m_bat_blocks[1].FixChecksums();
bat_block_1_error_code = card.m_bat_blocks[1].CheckForErrors(card_size_mbits);
}
else
{
// should never reach here
assert(0);
}
}
error_code |= dir_block_0_error_code;
error_code |= dir_block_1_error_code;
error_code |= bat_block_0_error_code;
error_code |= bat_block_1_error_code;
// select the in-use Dir and BAT blocks based on update counter
// These are compared as signed values by the GC BIOS. There is no protection against overflow, so
// if one block is MAX_VAL and the other is MIN_VAL it still picks the MAX_VAL one as the active
// one, even if that results in a corrupted memory card.
// TODO: We could try to be smarter about this to rescue seemingly-corrupted cards.
if (card.m_directory_blocks[0].m_update_counter >= card.m_directory_blocks[1].m_update_counter)
card.m_active_directory = 0;
else
card.m_active_directory = 1;
if (card.m_bat_blocks[0].m_update_counter >= card.m_bat_blocks[1].m_update_counter)
card.m_active_bat = 0;
else
card.m_active_bat = 1;
// check for consistency between the active Dir and BAT
const GCMemcardErrorCode dir_bat_consistency_error_code =
card.GetActiveDirectory().CheckForErrorsWithBat(card.GetActiveBat());
error_code |= dir_bat_consistency_error_code;
if (error_code.HasCriticalErrors())
return std::make_pair(error_code, std::nullopt);
card.m_valid = true;
return std::make_pair(error_code, std::move(card));
}
const Directory& GCMemcard::GetActiveDirectory() const
{
return m_directory_blocks[m_active_directory];
}
const BlockAlloc& GCMemcard::GetActiveBat() const
{
return m_bat_blocks[m_active_bat];
}
void GCMemcard::UpdateDirectory(const Directory& directory)
{
// overwrite inactive dir with given data, then set active dir to written block
int new_directory_index = m_active_directory == 0 ? 1 : 0;
m_directory_blocks[new_directory_index] = directory;
m_active_directory = new_directory_index;
}
void GCMemcard::UpdateBat(const BlockAlloc& bat)
{
// overwrite inactive BAT with given data, then set active BAT to written block
int new_bat_index = m_active_bat == 0 ? 1 : 0;
m_bat_blocks[new_bat_index] = bat;
m_active_bat = new_bat_index;
}
bool GCMemcard::IsShiftJIS() const
{
return m_header_block.m_encoding != 0;
}
bool GCMemcard::Save()
{
File::IOFile mcdFile(m_filename, "wb");
mcdFile.Seek(0, SEEK_SET);
mcdFile.WriteBytes(&m_header_block, BLOCK_SIZE);
mcdFile.WriteBytes(&m_directory_blocks[0], BLOCK_SIZE);
mcdFile.WriteBytes(&m_directory_blocks[1], BLOCK_SIZE);
mcdFile.WriteBytes(&m_bat_blocks[0], BLOCK_SIZE);
mcdFile.WriteBytes(&m_bat_blocks[1], BLOCK_SIZE);
for (unsigned int i = 0; i < m_size_blocks - MC_FST_BLOCKS; ++i)
{
mcdFile.WriteBytes(m_data_blocks[i].m_block.data(), m_data_blocks[i].m_block.size());
}
return mcdFile.Close();
}
std::pair<u16, u16> CalculateMemcardChecksums(const u8* data, size_t size)
{
assert(size % 2 == 0);
u16 csum = 0;
u16 inv_csum = 0;
for (size_t i = 0; i < size; i += 2)
{
u16 d = Common::swap16(&data[i]);
csum += d;
inv_csum += static_cast<u16>(d ^ 0xffff);
}
csum = Common::swap16(csum);
inv_csum = Common::swap16(inv_csum);
if (csum == 0xffff)
csum = 0;
if (inv_csum == 0xffff)
inv_csum = 0;
return std::make_pair(csum, inv_csum);
}
bool GCMemcard::FixChecksums()
{
if (!m_valid)
return false;
m_header_block.FixChecksums();
m_directory_blocks[0].FixChecksums();
m_directory_blocks[1].FixChecksums();
m_bat_blocks[0].FixChecksums();
m_bat_blocks[1].FixChecksums();
return true;
}
u8 GCMemcard::GetNumFiles() const
{
if (!m_valid)
return 0;
u8 j = 0;
for (int i = 0; i < DIRLEN; i++)
{
if (GetActiveDirectory().m_dir_entries[i].m_gamecode != DEntry::UNINITIALIZED_GAMECODE)
j++;
}
return j;
}
u8 GCMemcard::GetFileIndex(u8 fileNumber) const
{
if (m_valid)
{
u8 j = 0;
for (u8 i = 0; i < DIRLEN; i++)
{
if (GetActiveDirectory().m_dir_entries[i].m_gamecode != DEntry::UNINITIALIZED_GAMECODE)
{
if (j == fileNumber)
{
return i;
}
j++;
}
}
}
return 0xFF;
}
u16 GCMemcard::GetFreeBlocks() const
{
if (!m_valid)
return 0;
return GetActiveBat().m_free_blocks;
}
u8 GCMemcard::TitlePresent(const DEntry& d) const
{
if (!m_valid)
return DIRLEN;
u8 i = 0;
while (i < DIRLEN)
{
if (GetActiveDirectory().m_dir_entries[i].m_gamecode == d.m_gamecode &&
GetActiveDirectory().m_dir_entries[i].m_filename == d.m_filename)
{
break;
}
i++;
}
return i;
}
bool GCMemcard::GCI_FileName(u8 index, std::string& filename) const
{
if (!m_valid || index >= DIRLEN ||
GetActiveDirectory().m_dir_entries[index].m_gamecode == DEntry::UNINITIALIZED_GAMECODE)
return false;
filename = GetActiveDirectory().m_dir_entries[index].GCI_FileName();
return true;
}
// DEntry functions, all take u8 index < DIRLEN (127)
// Functions that have ascii output take a char *buffer
std::string GCMemcard::DEntry_GameCode(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return "";
return std::string(
reinterpret_cast<const char*>(GetActiveDirectory().m_dir_entries[index].m_gamecode.data()),
GetActiveDirectory().m_dir_entries[index].m_gamecode.size());
}
std::string GCMemcard::DEntry_Makercode(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return "";
return std::string(
reinterpret_cast<const char*>(GetActiveDirectory().m_dir_entries[index].m_makercode.data()),
GetActiveDirectory().m_dir_entries[index].m_makercode.size());
}
std::string GCMemcard::DEntry_BIFlags(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return "";
std::string flags;
int x = GetActiveDirectory().m_dir_entries[index].m_banner_and_icon_flags;
for (int i = 0; i < 8; i++)
{
flags.push_back((x & 0x80) ? '1' : '0');
x = x << 1;
}
return flags;
}
bool GCMemcard::DEntry_IsPingPong(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return false;
const int flags = GetActiveDirectory().m_dir_entries[index].m_banner_and_icon_flags;
return (flags & 0b0000'0100) != 0;
}
std::string GCMemcard::DEntry_FileName(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return "";
return std::string(
reinterpret_cast<const char*>(GetActiveDirectory().m_dir_entries[index].m_filename.data()),
GetActiveDirectory().m_dir_entries[index].m_filename.size());
}
u32 GCMemcard::DEntry_ModTime(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return 0xFFFFFFFF;
return GetActiveDirectory().m_dir_entries[index].m_modification_time;
}
u32 GCMemcard::DEntry_ImageOffset(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return 0xFFFFFFFF;
return GetActiveDirectory().m_dir_entries[index].m_image_offset;
}
std::string GCMemcard::DEntry_IconFmt(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return "";
u16 x = GetActiveDirectory().m_dir_entries[index].m_icon_format;
std::string format;
for (size_t i = 0; i < 16; ++i)
{
format.push_back(Common::ExtractBit(x, 15 - i) ? '1' : '0');
}
return format;
}
std::string GCMemcard::DEntry_AnimSpeed(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return "";
u16 x = GetActiveDirectory().m_dir_entries[index].m_animation_speed;
std::string speed;
for (size_t i = 0; i < 16; ++i)
{
speed.push_back(Common::ExtractBit(x, 15 - i) ? '1' : '0');
}
return speed;
}
std::string GCMemcard::DEntry_Permissions(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return "";
u8 Permissions = GetActiveDirectory().m_dir_entries[index].m_file_permissions;
std::string permissionsString;
permissionsString.push_back((Permissions & 16) ? 'x' : 'M');
permissionsString.push_back((Permissions & 8) ? 'x' : 'C');
permissionsString.push_back((Permissions & 4) ? 'P' : 'x');
return permissionsString;
}
u8 GCMemcard::DEntry_CopyCounter(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return 0xFF;
return GetActiveDirectory().m_dir_entries[index].m_copy_counter;
}
u16 GCMemcard::DEntry_FirstBlock(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return 0xFFFF;
u16 block = GetActiveDirectory().m_dir_entries[index].m_first_block;
if (block > (u16)m_size_blocks)
return 0xFFFF;
return block;
}
u16 GCMemcard::DEntry_BlockCount(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return 0xFFFF;
u16 blocks = GetActiveDirectory().m_dir_entries[index].m_block_count;
if (blocks > (u16)m_size_blocks)
return 0xFFFF;
return blocks;
}
u32 GCMemcard::DEntry_CommentsAddress(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return 0xFFFF;
return GetActiveDirectory().m_dir_entries[index].m_comments_address;
}
std::string GCMemcard::GetSaveComment1(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return "";
u32 Comment1 = GetActiveDirectory().m_dir_entries[index].m_comments_address;
u32 DataBlock = GetActiveDirectory().m_dir_entries[index].m_first_block - MC_FST_BLOCKS;
if ((DataBlock > m_size_blocks) || (Comment1 == 0xFFFFFFFF))
{
return "";
}
return std::string((const char*)m_data_blocks[DataBlock].m_block.data() + Comment1,
DENTRY_STRLEN);
}
std::string GCMemcard::GetSaveComment2(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return "";
u32 Comment1 = GetActiveDirectory().m_dir_entries[index].m_comments_address;
u32 Comment2 = Comment1 + DENTRY_STRLEN;
u32 DataBlock = GetActiveDirectory().m_dir_entries[index].m_first_block - MC_FST_BLOCKS;
if ((DataBlock > m_size_blocks) || (Comment1 == 0xFFFFFFFF))
{
return "";
}
return std::string((const char*)m_data_blocks[DataBlock].m_block.data() + Comment2,
DENTRY_STRLEN);
}
std::optional<DEntry> GCMemcard::GetDEntry(u8 index) const
{
if (!m_valid || index >= DIRLEN)
return std::nullopt;
return GetActiveDirectory().m_dir_entries[index];
}
BlockAlloc::BlockAlloc(u16 size_mbits)
{
memset(this, 0, BLOCK_SIZE);
m_free_blocks = (size_mbits * MBIT_TO_BLOCKS) - MC_FST_BLOCKS;
m_last_allocated_block = 4;
FixChecksums();
}
u16 BlockAlloc::GetNextBlock(u16 block) const
{
// FIXME: This is fishy, shouldn't that be in range [5, 4096[?
if ((block < MC_FST_BLOCKS) || (block > 4091))
return 0;
return m_map[block - MC_FST_BLOCKS];
}
// Parameters and return value are expected as memory card block index,
// not BAT index; that is, block 5 is the first file data block.
u16 BlockAlloc::NextFreeBlock(u16 max_block, u16 starting_block) const
{
if (m_free_blocks > 0)
{
starting_block = std::clamp<u16>(starting_block, MC_FST_BLOCKS, BAT_SIZE + MC_FST_BLOCKS);
max_block = std::clamp<u16>(max_block, MC_FST_BLOCKS, BAT_SIZE + MC_FST_BLOCKS);
for (u16 i = starting_block; i < max_block; ++i)
if (m_map[i - MC_FST_BLOCKS] == 0)
return i;
for (u16 i = MC_FST_BLOCKS; i < starting_block; ++i)
if (m_map[i - MC_FST_BLOCKS] == 0)
return i;
}
return 0xFFFF;
}
bool BlockAlloc::ClearBlocks(u16 starting_block, u16 block_count)
{
std::vector<u16> blocks;
while (starting_block != 0xFFFF && starting_block != 0)
{
blocks.push_back(starting_block);
starting_block = GetNextBlock(starting_block);
}
if (starting_block > 0)
{
size_t length = blocks.size();
if (length != block_count)
{
return false;
}
for (unsigned int i = 0; i < length; ++i)
m_map[blocks.at(i) - MC_FST_BLOCKS] = 0;
m_free_blocks = m_free_blocks + block_count;
return true;
}
return false;
}
void BlockAlloc::FixChecksums()
{
std::tie(m_checksum, m_checksum_inv) = CalculateChecksums();
}
u16 BlockAlloc::AssignBlocksContiguous(u16 length)
{
u16 starting = m_last_allocated_block + 1;
if (length > m_free_blocks)
return 0xFFFF;
u16 current = starting;
while ((current - starting + 1) < length)
{
m_map[current - 5] = current + 1;
current++;
}
m_map[current - 5] = 0xFFFF;
m_last_allocated_block = current;
m_free_blocks = m_free_blocks - length;
FixChecksums();
return starting;
}
std::pair<u16, u16> BlockAlloc::CalculateChecksums() const
{
static_assert(std::is_trivially_copyable<BlockAlloc>());
std::array<u8, sizeof(BlockAlloc)> raw;
memcpy(raw.data(), this, raw.size());
constexpr size_t checksum_area_start = offsetof(BlockAlloc, m_update_counter);
constexpr size_t checksum_area_end = sizeof(BlockAlloc);
constexpr size_t checksum_area_size = checksum_area_end - checksum_area_start;
return CalculateMemcardChecksums(&raw[checksum_area_start], checksum_area_size);
}
GCMemcardErrorCode BlockAlloc::CheckForErrors(u16 size_mbits) const
{
GCMemcardErrorCode error_code;
// verify checksums
const auto [checksum_sum, checksum_inv] = CalculateChecksums();
if (checksum_sum != m_checksum || checksum_inv != m_checksum_inv)
error_code.Set(GCMemcardValidityIssues::INVALID_CHECKSUM);
if (size_mbits > 0 && size_mbits <= 256)
{
// check if free block count matches the actual amount of free blocks in m_map
const u16 total_available_blocks = (size_mbits * MBIT_TO_BLOCKS) - MC_FST_BLOCKS;
assert(total_available_blocks <= m_map.size());
u16 blocks_in_use = 0;
for (size_t i = 0; i < total_available_blocks; ++i)
{
if (m_map[i] != 0)
++blocks_in_use;
}
const u16 free_blocks = total_available_blocks - blocks_in_use;
if (free_blocks != m_free_blocks)
error_code.Set(GCMemcardValidityIssues::FREE_BLOCK_MISMATCH);
// remaining blocks map to nothing on hardware and must be empty
for (size_t i = total_available_blocks; i < m_map.size(); ++i)
{
if (m_map[i] != 0)
{
error_code.Set(GCMemcardValidityIssues::DATA_IN_UNUSED_AREA);
break;
}
}
}
else
{
// card size is outside the range of blocks that can be addressed
error_code.Set(GCMemcardValidityIssues::INVALID_CARD_SIZE);
}
return error_code;
}
GCMemcardGetSaveDataRetVal GCMemcard::GetSaveData(u8 index, std::vector<GCMBlock>& Blocks) const
{
if (!m_valid)
return GCMemcardGetSaveDataRetVal::NOMEMCARD;
u16 block = DEntry_FirstBlock(index);
u16 BlockCount = DEntry_BlockCount(index);
// u16 memcardSize = BE16(hdr.m_size_mb) * MBIT_TO_BLOCKS;
if ((block == 0xFFFF) || (BlockCount == 0xFFFF))
{
return GCMemcardGetSaveDataRetVal::FAIL;
}
u16 nextBlock = block;
for (int i = 0; i < BlockCount; ++i)
{
if ((!nextBlock) || (nextBlock == 0xFFFF))
return GCMemcardGetSaveDataRetVal::FAIL;
Blocks.push_back(m_data_blocks[nextBlock - MC_FST_BLOCKS]);
nextBlock = GetActiveBat().GetNextBlock(nextBlock);
}
return GCMemcardGetSaveDataRetVal::SUCCESS;
}
// End DEntry functions
GCMemcardImportFileRetVal GCMemcard::ImportFile(const DEntry& direntry,
std::vector<GCMBlock>& saveBlocks)
{
if (!m_valid)
return GCMemcardImportFileRetVal::NOMEMCARD;
if (GetNumFiles() >= DIRLEN)
{
return GCMemcardImportFileRetVal::OUTOFDIRENTRIES;
}
if (GetActiveBat().m_free_blocks < direntry.m_block_count)
{
return GCMemcardImportFileRetVal::OUTOFBLOCKS;
}
if (TitlePresent(direntry) != DIRLEN)
{
return GCMemcardImportFileRetVal::TITLEPRESENT;
}
// find first free data block
u16 firstBlock =
GetActiveBat().NextFreeBlock(m_size_blocks, GetActiveBat().m_last_allocated_block);
if (firstBlock == 0xFFFF)
return GCMemcardImportFileRetVal::OUTOFBLOCKS;
Directory UpdatedDir = GetActiveDirectory();
// find first free dir entry
for (int i = 0; i < DIRLEN; i++)
{
if (UpdatedDir.m_dir_entries[i].m_gamecode == DEntry::UNINITIALIZED_GAMECODE)
{
UpdatedDir.m_dir_entries[i] = direntry;
UpdatedDir.m_dir_entries[i].m_first_block = firstBlock;
UpdatedDir.m_dir_entries[i].m_copy_counter = UpdatedDir.m_dir_entries[i].m_copy_counter + 1;
break;
}
}
UpdatedDir.m_update_counter = UpdatedDir.m_update_counter + 1;
UpdateDirectory(UpdatedDir);
int fileBlocks = direntry.m_block_count;
FZEROGX_MakeSaveGameValid(m_header_block, direntry, saveBlocks);
PSO_MakeSaveGameValid(m_header_block, direntry, saveBlocks);
BlockAlloc UpdatedBat = GetActiveBat();
u16 nextBlock;
// keep assuming no freespace fragmentation, and copy over all the data
for (int i = 0; i < fileBlocks; ++i)
{
if (firstBlock == 0xFFFF)
PanicAlert("Fatal Error");
m_data_blocks[firstBlock - MC_FST_BLOCKS] = saveBlocks[i];
if (i == fileBlocks - 1)
nextBlock = 0xFFFF;
else
nextBlock = UpdatedBat.NextFreeBlock(m_size_blocks, firstBlock + 1);
UpdatedBat.m_map[firstBlock - MC_FST_BLOCKS] = nextBlock;
UpdatedBat.m_last_allocated_block = firstBlock;
firstBlock = nextBlock;
}
UpdatedBat.m_free_blocks = UpdatedBat.m_free_blocks - fileBlocks;
UpdatedBat.m_update_counter = UpdatedBat.m_update_counter + 1;
UpdateBat(UpdatedBat);
FixChecksums();
return GCMemcardImportFileRetVal::SUCCESS;
}
GCMemcardRemoveFileRetVal GCMemcard::RemoveFile(u8 index) // index in the directory array
{
if (!m_valid)
return GCMemcardRemoveFileRetVal::NOMEMCARD;
if (index >= DIRLEN)
return GCMemcardRemoveFileRetVal::DELETE_FAIL;
u16 startingblock = GetActiveDirectory().m_dir_entries[index].m_first_block;
u16 numberofblocks = GetActiveDirectory().m_dir_entries[index].m_block_count;
BlockAlloc UpdatedBat = GetActiveBat();
if (!UpdatedBat.ClearBlocks(startingblock, numberofblocks))
return GCMemcardRemoveFileRetVal::DELETE_FAIL;
UpdatedBat.m_update_counter = UpdatedBat.m_update_counter + 1;
UpdateBat(UpdatedBat);
Directory UpdatedDir = GetActiveDirectory();
// TODO: Deleting a file via the GC BIOS sometimes leaves behind an extra updated directory block
// here that has an empty file with the filename "Broken File000" where the actual deleted file
// was. Determine when exactly this happens and if this is neccessary for anything.
memset(&(UpdatedDir.m_dir_entries[index]), 0xFF, DENTRY_SIZE);
UpdatedDir.m_update_counter = UpdatedDir.m_update_counter + 1;
UpdateDirectory(UpdatedDir);
FixChecksums();
return GCMemcardRemoveFileRetVal::SUCCESS;
}
GCMemcardImportFileRetVal GCMemcard::CopyFrom(const GCMemcard& source, u8 index)
{
if (!m_valid || !source.m_valid)
return GCMemcardImportFileRetVal::NOMEMCARD;
std::optional<DEntry> tempDEntry = source.GetDEntry(index);
if (!tempDEntry)
return GCMemcardImportFileRetVal::NOMEMCARD;
u32 size = source.DEntry_BlockCount(index);
if (size == 0xFFFF)
return GCMemcardImportFileRetVal::INVALIDFILESIZE;
std::vector<GCMBlock> saveData;
saveData.reserve(size);
switch (source.GetSaveData(index, saveData))
{
case GCMemcardGetSaveDataRetVal::FAIL:
return GCMemcardImportFileRetVal::FAIL;
case GCMemcardGetSaveDataRetVal::NOMEMCARD:
return GCMemcardImportFileRetVal::NOMEMCARD;
default:
FixChecksums();
return ImportFile(*tempDEntry, saveData);
}
}
GCMemcardImportFileRetVal GCMemcard::ImportGci(const std::string& inputFile)
{
if (!m_valid)
return GCMemcardImportFileRetVal::OPENFAIL;
File::IOFile gci(inputFile, "rb");
if (!gci)
return GCMemcardImportFileRetVal::OPENFAIL;
return ImportGciInternal(std::move(gci), inputFile);
}
GCMemcardImportFileRetVal GCMemcard::ImportGciInternal(File::IOFile&& gci,
const std::string& inputFile)
{
unsigned int offset;
std::string fileType;
SplitPath(inputFile, nullptr, nullptr, &fileType);
if (!strcasecmp(fileType.c_str(), ".gci"))
offset = GCI;
else
{
char tmp[0xD];
gci.ReadBytes(tmp, sizeof(tmp));
if (!strcasecmp(fileType.c_str(), ".gcs"))
{
if (!memcmp(tmp, "GCSAVE", 6)) // Header must be uppercase
offset = GCS;
else
return GCMemcardImportFileRetVal::GCSFAIL;
}
else if (!strcasecmp(fileType.c_str(), ".sav"))
{
if (!memcmp(tmp, "DATELGC_SAVE", 0xC)) // Header must be uppercase
offset = SAV;
else
return GCMemcardImportFileRetVal::SAVFAIL;
}
else
return GCMemcardImportFileRetVal::OPENFAIL;
}
gci.Seek(offset, SEEK_SET);
DEntry tempDEntry;
gci.ReadBytes(&tempDEntry, DENTRY_SIZE);
const u64 fStart = gci.Tell();
gci.Seek(0, SEEK_END);
const u64 length = gci.Tell() - fStart;
gci.Seek(offset + DENTRY_SIZE, SEEK_SET);
Gcs_SavConvert(tempDEntry, offset, length);
if (length != tempDEntry.m_block_count * BLOCK_SIZE)
return GCMemcardImportFileRetVal::LENGTHFAIL;
if (gci.Tell() != offset + DENTRY_SIZE) // Verify correct file position
return GCMemcardImportFileRetVal::OPENFAIL;
u32 size = tempDEntry.m_block_count;
std::vector<GCMBlock> saveData;
saveData.reserve(size);
for (unsigned int i = 0; i < size; ++i)
{
GCMBlock b;
gci.ReadBytes(b.m_block.data(), b.m_block.size());
saveData.push_back(b);
}
return ImportFile(tempDEntry, saveData);
}
GCMemcardExportFileRetVal GCMemcard::ExportGci(u8 index, const std::string& fileName,
const std::string& directory) const
{
File::IOFile gci;
int offset = GCI;