Use asynchronous I/O for Card access

CMakeLists.txt

@@ -9,11 +9,14 @@ set(KABUFUDA_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/include CACHE PATH "kabufud
 
 unset(PLAT_SRCS)
 if(WIN32)
-list(APPEND PLAT_SRCS lib/kabufuda/winsupport.cpp include/kabufuda/winsupport.hpp)
+list(APPEND PLAT_SRCS lib/kabufuda/winsupport.cpp include/kabufuda/winsupport.hpp lib/kabufuda/AsyncIOWin32.cpp)
+else()
+list(APPEND PLAT_SRCS lib/kabufuda/AsyncIOPosix.cpp)
 endif()
 
 add_library(kabufuda STATIC
     include/kabufuda/Constants.hpp
+    include/kabufuda/AsyncIO.hpp
     include/kabufuda/BlockAllocationTable.hpp lib/kabufuda/BlockAllocationTable.cpp
     include/kabufuda/Card.hpp lib/kabufuda/Card.cpp
     include/kabufuda/Directory.hpp lib/kabufuda/Directory.cpp

include/kabufuda/AsyncIO.hpp

@@ -0,0 +1,47 @@
+#ifndef __KABU_ASYNCIO_HPP__
+#define __KABU_ASYNCIO_HPP__
+
+#ifndef _WIN32
+#include <aio.h>
+using SizeReturn = ssize_t;
+#else
+#include <windows.h>
+using SizeReturn = SSIZE_T;
+#endif
+
+#include "Util.hpp"
+#include <vector>
+
+namespace kabufuda
+{
+
+class AsyncIO
+{
+#ifndef _WIN32
+    int m_fd = -1;
+    std::vector<std::pair<struct aiocb, SizeReturn>> m_queue;
+#else
+#endif
+    size_t m_maxBlock = 0;
+public:
+    AsyncIO() = default;
+    AsyncIO(SystemStringView filename, bool truncate = false);
+    ~AsyncIO();
+    AsyncIO(AsyncIO&& other);
+    AsyncIO& operator=(AsyncIO&& other);
+    AsyncIO(const AsyncIO* other) = delete;
+    AsyncIO& operator=(const AsyncIO& other) = delete;
+    void resizeQueue(size_t queueSz) { m_queue.resize(queueSz); }
+    SizeReturn syncRead(void* buf, size_t length, off_t offset);
+    bool asyncRead(size_t qIdx, void* buf, size_t length, off_t offset);
+    SizeReturn syncWrite(const void* buf, size_t length, off_t offset);
+    bool asyncWrite(size_t qIdx, const void* buf, size_t length, off_t offset);
+    ECardResult pollStatus(size_t qIdx, SizeReturn* szRet = nullptr) const;
+    ECardResult pollStatus() const;
+    void waitForCompletion() const;
+    operator bool() const { return m_fd != -1; }
+};
+
+}
+
+#endif // __KABU_ASYNCIO_HPP__

include/kabufuda/Card.hpp

@@ -5,6 +5,7 @@
 #include "Directory.hpp"
 #include "File.hpp"
 #include "Util.hpp"
+#include "AsyncIO.hpp"
 
 #include <string>
 #include <vector>
@@ -12,7 +13,6 @@
 
 #define CARD_FILENAME_MAX 32
 #define CARD_ICON_MAX 8
-#undef NOFILE
 
 namespace kabufuda
 {
@@ -29,24 +29,6 @@ public:
     operator bool() const { return getFileNo() != -1; }
 };
 
-enum class ECardResult
-{
-    CRC_MISMATCH = -1003, /* Extension enum for Retro's CRC check */
-    FATAL_ERROR = -128,
-    ENCODING = -13,
-    NAMETOOLONG = -12,
-    INSSPACE = -9,
-    NOENT = -8,
-    EXIST = -7,
-    BROKEN = -6,
-    IOERROR = -5,
-    NOFILE = -4,
-    NOCARD = -3,
-    WRONGDEVICE = -2,
-    BUSY = -1,
-    READY = 0
-};
-
 struct ProbeResults
 {
     ECardResult x0_error;
@@ -102,8 +84,7 @@ struct CardStat
 class Card
 {
 #pragma pack(push, 4)
-    union {
+    struct CardHeader
-        struct
     {
         uint8_t m_serial[12];
         uint64_t m_formatTime;
@@ -117,16 +98,21 @@ class Card
         uint16_t m_updateCounter;
         uint16_t m_checksum;
         uint16_t m_checksumInv;
+        void _swapEndian();
     };
+    union {
+        CardHeader m_ch;
         uint8_t __raw[BlockSize];
     };
-
+    CardHeader m_tmpCh;
 #pragma pack(pop)
 
     SystemString m_filename;
-    FILE* m_fileHandle = nullptr;
+    AsyncIO m_fileHandle;
     Directory m_dirs[2];
     BlockAllocationTable m_bats[2];
+    Directory m_tmpDirs[2];
+    BlockAllocationTable m_tmpBats[2];
     uint8_t m_currentDir;
     uint8_t m_currentBat;
 
@@ -134,12 +120,15 @@ class Card
     char m_game[5] = {'\0'};
     char m_maker[3] = {'\0'};
 
-    void _swapEndian();
     void _updateDirAndBat(const Directory& dir, const BlockAllocationTable& bat);
     void _updateChecksum();
     File* _fileFromHandle(const FileHandle& fh) const;
     void _deleteFile(File& f, BlockAllocationTable& bat);
 
+    bool m_dirty = false;
+    bool m_opened = false;
+    ECardResult _pumpOpen();
+
 public:
     Card();
     /**
@@ -157,7 +146,7 @@ public:
      * @param game
      * @param maker
      */
-    Card(SystemStringView filepath, const char* game = nullptr, const char* maker = nullptr);
+    Card(const char* game = nullptr, const char* maker = nullptr);
     ~Card();
 
     /**
@@ -237,7 +226,7 @@ public:
      * @param buf
      * @param size
      */
-    ECardResult write(FileHandle& fh, const void* buf, size_t size);
+    ECardResult asyncWrite(FileHandle& fh, const void* buf, size_t size);
 
     /**
      * @brief read
@@ -245,7 +234,7 @@ public:
      * @param dst
      * @param size
      */
-    ECardResult read(FileHandle& fh, void* dst, size_t size);
+    ECardResult asyncRead(FileHandle& fh, void* dst, size_t size);
 
     /**
      * @brief seek
@@ -336,6 +325,7 @@ public:
      */
     ECardResult setStatus(uint32_t fileNo, const CardStat& stat);
 
+#if 0 // TODO: Async-friendly implementations
     /**
      * @brief Copies a file from the current Card instance to a specified Card instance
      * @param fh The file to copy
@@ -351,6 +341,7 @@ public:
      * @return
      */
     bool moveFileTo(FileHandle& fh, Card& dest);
+#endif
 
     /**
      * @brief Sets the current game, if not null any openFile requests will only return files that match this game
@@ -417,6 +408,11 @@ public:
      */
     void commit();
 
+    /**
+     * @brief Opens card image (does nothing if currently open path matches)
+     */
+    bool open(SystemStringView filepath);
+
     /**
      * @brief Commits changes to disk and closes host file
      */

include/kabufuda/Util.hpp

@@ -250,71 +250,6 @@ typedef struct stat Sstat;
 
 uint64_t getGCTime();
 
-enum class FileLockType
-{
-    None = 0,
-    Read,
-    Write
-};
-static inline FILE* Fopen(const SystemChar* path, const SystemChar* mode, FileLockType lock = FileLockType::None)
-{
-#if CARD_UCS2
-    FILE* fp = _wfopen(path, mode);
-    if (!fp)
-        return nullptr;
-#else
-    FILE* fp = fopen(path, mode);
-    if (!fp)
-        return nullptr;
-#endif
-
-    if (lock != FileLockType::None)
-    {
-#if _WIN32
-        OVERLAPPED ov = {};
-        LockFileEx((HANDLE)(uintptr_t)_fileno(fp), (lock == FileLockType::Write) ? LOCKFILE_EXCLUSIVE_LOCK : 0, 0, 0, 1,
-                   &ov);
-#else
-        if (flock(fileno(fp), ((lock == FileLockType::Write) ? LOCK_EX : LOCK_SH) | LOCK_NB))
-            fprintf(stderr, "flock %s: %s", path, strerror(errno));
-#endif
-    }
-
-    return fp;
-}
-
-static inline int FSeek(FILE* fp, int64_t offset, int whence)
-{
-#if _WIN32
-    return _fseeki64(fp, offset, whence);
-#elif __APPLE__ || __FreeBSD__
-    return fseeko(fp, offset, whence);
-#else
-    return fseeko64(fp, offset, whence);
-#endif
-}
-
-static inline int64_t FTell(FILE* fp)
-{
-#if _WIN32
-    return _ftelli64(fp);
-#elif __APPLE__ || __FreeBSD__
-    return ftello(fp);
-#else
-    return ftello64(fp);
-#endif
-}
-
-static inline int Rename(const SystemChar* oldpath, const SystemChar* newpath)
-{
-#if CARD_UCS2
-    //return _wrename(oldpath, newpath);
-   return  MoveFileExW(oldpath, newpath, MOVEFILE_REPLACE_EXISTING | MOVEFILE_WRITE_THROUGH) == 0;
-#else
-    return rename(oldpath, newpath);
-#endif
-}
-
 #if !defined(S_ISREG) && defined(S_IFMT) && defined(S_IFREG)
 #define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
 #endif
@@ -349,6 +284,26 @@ static inline int Stat(const SystemChar* path, Sstat* statOut)
  * @param checksumInv
  */
 void calculateChecksumBE(const uint16_t* data, size_t len, uint16_t* checksum, uint16_t* checksumInv);
+
+#undef NOFILE
+
+enum class ECardResult
+{
+    CRC_MISMATCH = -1003, /* Extension enum for Retro's CRC check */
+    FATAL_ERROR = -128,
+    ENCODING = -13,
+    NAMETOOLONG = -12,
+    INSSPACE = -9,
+    NOENT = -8,
+    EXIST = -7,
+    BROKEN = -6,
+    IOERROR = -5,
+    NOFILE = -4,
+    NOCARD = -3,
+    WRONGDEVICE = -2,
+    BUSY = -1,
+    READY = 0
+};
 }
 
 #endif // __KABU_UTIL_HPP__

lib/kabufuda/AsyncIOPosix.cpp

@@ -0,0 +1,183 @@
+#include "kabufuda/AsyncIO.hpp"
+
+namespace kabufuda
+{
+
+AsyncIO::AsyncIO(SystemStringView filename, bool truncate)
+{
+    m_fd = open(filename.data(), O_RDWR | O_CREAT | (truncate ? O_TRUNC : 0));
+}
+
+AsyncIO::~AsyncIO()
+{
+    if (*this)
+    {
+        aio_cancel(m_fd, nullptr);
+        close(m_fd);
+    }
+}
+
+AsyncIO::AsyncIO(AsyncIO&& other)
+{
+    m_fd = other.m_fd;
+    other.m_fd = -1;
+    m_queue = std::move(other.m_queue);
+    m_maxBlock = other.m_maxBlock;
+}
+
+AsyncIO& AsyncIO::operator=(AsyncIO&& other)
+{
+    if (*this)
+    {
+        aio_cancel(m_fd, nullptr);
+        close(m_fd);
+    }
+    m_fd = other.m_fd;
+    other.m_fd = -1;
+    m_queue = std::move(other.m_queue);
+    m_maxBlock = other.m_maxBlock;
+    return *this;
+}
+
+SizeReturn AsyncIO::syncRead(void* buf, size_t length, off_t offset)
+{
+    lseek(m_fd, offset, SEEK_SET);
+    return read(m_fd, buf, length);
+}
+
+bool AsyncIO::asyncRead(size_t qIdx, void* buf, size_t length, off_t offset)
+{
+    struct aiocb& aio = m_queue[qIdx].first;
+    if (aio.aio_fildes)
+    {
+#ifndef NDEBUG
+        fprintf(stderr, "WARNING: synchronous kabufuda fallback, check access polling\n");
+#endif
+        const struct aiocb* aiop = &aio;
+        struct timespec ts = {2, 0};
+        while (aio_suspend(&aiop, 1, &ts) && errno == EINTR) {}
+        if (aio_error(&aio) == 0)
+            aio_return(&aio);
+    }
+    memset(&aio, 0, sizeof(struct aiocb));
+    aio.aio_fildes = m_fd;
+    aio.aio_offset = offset;
+    aio.aio_buf = buf;
+    aio.aio_nbytes = length;
+    m_maxBlock = std::max(m_maxBlock, qIdx + 1);
+    return aio_read(&aio) == 0;
+}
+
+SizeReturn AsyncIO::syncWrite(const void* buf, size_t length, off_t offset)
+{
+    lseek(m_fd, offset, SEEK_SET);
+    return write(m_fd, buf, length);
+}
+
+bool AsyncIO::asyncWrite(size_t qIdx, const void* buf, size_t length, off_t offset)
+{
+    struct aiocb& aio = m_queue[qIdx].first;
+    if (aio.aio_fildes)
+    {
+#ifndef NDEBUG
+        fprintf(stderr, "WARNING: synchronous kabufuda fallback, check access polling\n");
+#endif
+        const struct aiocb* aiop = &aio;
+        struct timespec ts = {2, 0};
+        while (aio_suspend(&aiop, 1, &ts) && errno == EINTR) {}
+        if (aio_error(&aio) == 0)
+            aio_return(&aio);
+    }
+    memset(&aio, 0, sizeof(struct aiocb));
+    aio.aio_fildes = m_fd;
+    aio.aio_offset = offset;
+    aio.aio_buf = const_cast<void*>(buf);
+    aio.aio_nbytes = length;
+    m_maxBlock = std::max(m_maxBlock, qIdx + 1);
+    return aio_write(&aio) == 0;
+}
+
+ECardResult AsyncIO::pollStatus(size_t qIdx, SizeReturn* szRet) const
+{
+    auto& aio = const_cast<AsyncIO*>(this)->m_queue[qIdx];
+    if (aio.first.aio_fildes == 0)
+    {
+        if (szRet)
+            *szRet = aio.second;
+        return ECardResult::READY;
+    }
+    switch (aio_error(&aio.first))
+    {
+    case 0:
+        aio.second = aio_return(&aio.first);
+        aio.first.aio_fildes = 0;
+        if (szRet)
+            *szRet = aio.second;
+        return ECardResult::READY;
+    case EINPROGRESS:
+        return ECardResult::BUSY;
+    default:
+        return ECardResult::IOERROR;
+    }
+}
+
+ECardResult AsyncIO::pollStatus() const
+{
+    ECardResult result = ECardResult::READY;
+    for (auto it = const_cast<AsyncIO*>(this)->m_queue.begin();
+         it != const_cast<AsyncIO*>(this)->m_queue.begin() + m_maxBlock;
+         ++it)
+    {
+        auto& aio = *it;
+        if (aio.first.aio_fildes == 0)
+            continue;
+        switch (aio_error(&aio.first))
+        {
+        case 0:
+            aio.second = aio_return(&aio.first);
+            aio.first.aio_fildes = 0;
+            break;
+        case EINPROGRESS:
+            if (result > ECardResult::BUSY)
+                result = ECardResult::BUSY;
+            break;
+        default:
+            if (result > ECardResult::IOERROR)
+                result = ECardResult::IOERROR;
+            break;
+        }
+    }
+    if (result == ECardResult::READY)
+        const_cast<AsyncIO*>(this)->m_maxBlock = 0;
+    return result;
+}
+
+void AsyncIO::waitForCompletion() const
+{
+    for (auto it = const_cast<AsyncIO*>(this)->m_queue.begin();
+         it != const_cast<AsyncIO*>(this)->m_queue.begin() + m_maxBlock;
+         ++it)
+    {
+        auto& aio = *it;
+        if (aio.first.aio_fildes == 0)
+            continue;
+        switch (aio_error(&aio.first))
+        {
+        case 0:
+            aio.second = aio_return(&aio.first);
+            aio.first.aio_fildes = 0;
+            break;
+        case EINPROGRESS:
+        {
+            const struct aiocb* aiop = &aio.first;
+            struct timespec ts = {2, 0};
+            while (aio_suspend(&aiop, 1, &ts) && errno == EINTR) {}
+            break;
+        }
+        default:
+            break;
+        }
+    }
+}
+
+}

lib/kabufuda/AsyncIOWin32.cpp

@@ -0,0 +1,4 @@
+//
+// Created by Jack Andersen on 2/5/18.
+//
+

lib/kabufuda/Card.cpp

@@ -15,7 +15,7 @@ static void NullFileAccess()
     fprintf(stderr, "Attempted to access null file\n");
 }
 
-void Card::_swapEndian()
+void Card::CardHeader::_swapEndian()
 {
     m_formatTime = SBig(m_formatTime);
     m_sramBias = SBig(m_sramBias);
@@ -35,8 +35,7 @@ Card::Card(Card&& other)
 {
     memmove(__raw, other.__raw, BlockSize);
     m_filename = std::move(other.m_filename);
-    m_fileHandle = other.m_fileHandle;
+    m_fileHandle = std::move(other.m_fileHandle);
-    other.m_fileHandle = nullptr;
     m_dirs[0] = std::move(other.m_dirs[0]);
     m_dirs[1] = std::move(other.m_dirs[1]);
     m_bats[0] = std::move(other.m_bats[0]);
@@ -55,8 +54,7 @@ Card& Card::operator=(Card&& other)
 
     memmove(__raw, other.__raw, BlockSize);
     m_filename = std::move(other.m_filename);
-    m_fileHandle = other.m_fileHandle;
+    m_fileHandle = std::move(other.m_fileHandle);
-    other.m_fileHandle = nullptr;
     m_dirs[0] = std::move(other.m_dirs[0]);
     m_dirs[1] = std::move(other.m_dirs[1]);
     m_bats[0] = std::move(other.m_bats[0]);
@@ -71,24 +69,20 @@ Card& Card::operator=(Card&& other)
     return *this;
 }
 
-Card::Card(SystemStringView filename, const char* game, const char* maker) : m_filename(filename)
+ECardResult Card::_pumpOpen()
 {
-    memset(__raw, 0xFF, BlockSize);
+    if (m_opened)
-    if (game && strlen(game) == 4)
+        return ECardResult::READY;
-        memcpy(m_game, game, 4);
-    if (maker && strlen(maker) == 2)
-        memcpy(m_maker, maker, 2);
 
-    m_fileHandle = Fopen(m_filename.c_str(), _S("rb"));
+    if (!m_fileHandle)
-    if (m_fileHandle)
+        return ECardResult::NOCARD;
+
+    ECardResult res = m_fileHandle.pollStatus();
+    if (res == ECardResult::READY)
     {
-        fread(__raw, 1, BlockSize, m_fileHandle);
+        m_ch._swapEndian();
-        m_maxBlock = m_sizeMb * MbitToBlocks;
+        m_maxBlock = m_ch.m_sizeMb * MbitToBlocks;
-        _swapEndian();
+        m_fileHandle.resizeQueue(m_maxBlock);
-        fread(m_dirs[0].__raw, 1, BlockSize, m_fileHandle);
-        fread(m_dirs[1].__raw, 1, BlockSize, m_fileHandle);
-        fread(m_bats[0].__raw, 1, BlockSize, m_fileHandle);
-        fread(m_bats[1].__raw, 1, BlockSize, m_fileHandle);
 
         m_dirs[0].swapEndian();
         m_dirs[1].swapEndian();
@@ -115,11 +109,19 @@ Card::Card(SystemStringView filename, const char* game, const char* maker) : m_f
         else
             m_currentBat = 1;
 
-        /* Close and reopen in read/write mode */
+        m_opened = true;
-        fclose(m_fileHandle);
-        m_fileHandle = Fopen(m_filename.c_str(), _S("r+b"));
-        rewind(m_fileHandle);
     }
+
+    return res;
+}
+
+Card::Card(const char* game, const char* maker)
+{
+    memset(__raw, 0xFF, BlockSize);
+    if (game && strlen(game) == 4)
+        memcpy(m_game, game, 4);
+    if (maker && strlen(maker) == 2)
+        memcpy(m_maker, maker, 2);
 }
 
 Card::~Card()
@@ -129,6 +131,10 @@ Card::~Card()
 
 ECardResult Card::openFile(const char* filename, FileHandle& handleOut)
 {
+    ECardResult openRes = _pumpOpen();
+    if (openRes != ECardResult::READY)
+        return openRes;
+
     handleOut = {};
     File* f = m_dirs[m_currentDir].getFile(m_game, m_maker, filename);
     if (!f || f->m_game[0] == 0xFF)
@@ -144,6 +150,10 @@ ECardResult Card::openFile(const char* filename, FileHandle& handleOut)
 
 ECardResult Card::openFile(uint32_t fileno, FileHandle& handleOut)
 {
+    ECardResult openRes = _pumpOpen();
+    if (openRes != ECardResult::READY)
+        return openRes;
+
     handleOut = {};
     File* f = m_dirs[m_currentDir].getFile(fileno);
     if (!f || f->m_game[0] == 0xFF)
@@ -165,13 +175,15 @@ void Card::_updateDirAndBat(const Directory& dir, const BlockAllocationTable& ba
     updateBat = bat;
     updateBat.m_updateCounter++;
     updateBat.updateChecksum();
+
+    m_dirty = true;
 }
 
 void Card::_updateChecksum()
 {
-    _swapEndian();
+    m_ch._swapEndian();
-    calculateChecksumBE(reinterpret_cast<uint16_t*>(__raw), 0xFE, &m_checksum, &m_checksumInv);
+    calculateChecksumBE(reinterpret_cast<uint16_t*>(__raw), 0xFE, &m_ch.m_checksum, &m_ch.m_checksumInv);
-    _swapEndian();
+    m_ch._swapEndian();
 }
 
 File* Card::_fileFromHandle(const FileHandle& fh) const
@@ -187,6 +199,10 @@ File* Card::_fileFromHandle(const FileHandle& fh) const
 ECardResult Card::createFile(const char* filename, size_t size,
                              FileHandle& handleOut)
 {
+    ECardResult openRes = _pumpOpen();
+    if (openRes != ECardResult::READY)
+        return openRes;
+
     handleOut = {};
 
     if (size <= 0)
@@ -283,6 +299,10 @@ void Card::deleteFile(const FileHandle& fh)
 
 ECardResult Card::deleteFile(const char* filename)
 {
+    ECardResult openRes = _pumpOpen();
+    if (openRes != ECardResult::READY)
+        return openRes;
+
     Directory dir = m_dirs[m_currentDir];
     File* f = dir.getFile(m_game, m_maker, filename);
     if (!f)
@@ -296,6 +316,10 @@ ECardResult Card::deleteFile(const char* filename)
 
 ECardResult Card::deleteFile(uint32_t fileno)
 {
+    ECardResult openRes = _pumpOpen();
+    if (openRes != ECardResult::READY)
+        return openRes;
+
     Directory dir = m_dirs[m_currentDir];
     File* f = dir.getFile(fileno);
     if (!f)
@@ -309,6 +333,10 @@ ECardResult Card::deleteFile(uint32_t fileno)
 
 ECardResult Card::renameFile(const char* oldName, const char* newName)
 {
+    ECardResult openRes = _pumpOpen();
+    if (openRes != ECardResult::READY)
+        return openRes;
+
     if (strlen(newName) > 32)
         return ECardResult::NAMETOOLONG;
 
@@ -332,10 +360,12 @@ ECardResult Card::renameFile(const char* oldName, const char* newName)
     return ECardResult::READY;
 }
 
-ECardResult Card::write(FileHandle& fh, const void* buf, size_t size)
+ECardResult Card::asyncWrite(FileHandle& fh, const void* buf, size_t size)
-{
-    if (m_fileHandle)
 {
+    ECardResult openRes = _pumpOpen();
+    if (openRes != ECardResult::READY)
+        return openRes;
+
     if (!fh)
     {
         NullFileAccess();
@@ -367,9 +397,8 @@ ECardResult Card::write(FileHandle& fh, const void* buf, size_t size)
         if (cacheSize + blockOffset > BlockSize)
             cacheSize = BlockSize - blockOffset;
         uint32_t offset = (curBlock * BlockSize) + blockOffset;
-            fseek(m_fileHandle, offset, SEEK_SET);
+        if (!m_fileHandle.asyncWrite(curBlock, tmpBuf, cacheSize, offset))
-            if (fwrite(tmpBuf, 1, cacheSize, m_fileHandle) != cacheSize)
+            return ECardResult::FATAL_ERROR;
-                return ECardResult::IOERROR;
         tmpBuf += cacheSize;
         rem -= cacheSize;
         blockOffset += cacheSize;
@@ -380,15 +409,16 @@ ECardResult Card::write(FileHandle& fh, const void* buf, size_t size)
         }
     }
     fh.offset += size;
-    }
 
     return ECardResult::READY;
 }
 
-ECardResult Card::read(FileHandle& fh, void* dst, size_t size)
+ECardResult Card::asyncRead(FileHandle& fh, void* dst, size_t size)
-{
-    if (m_fileHandle)
 {
+    ECardResult openRes = _pumpOpen();
+    if (openRes != ECardResult::READY)
+        return openRes;
+
     if (!fh)
     {
         NullFileAccess();
@@ -419,9 +449,8 @@ ECardResult Card::read(FileHandle& fh, void* dst, size_t size)
         if (cacheSize + blockOffset > BlockSize)
             cacheSize = BlockSize - blockOffset;
         uint32_t offset = (curBlock * BlockSize) + blockOffset;
-            fseek(m_fileHandle, offset, SEEK_SET);
+        if (!m_fileHandle.asyncRead(curBlock, tmpBuf, cacheSize, offset))
-            if (fread(tmpBuf, 1, cacheSize, m_fileHandle) != cacheSize)
+            return ECardResult::FATAL_ERROR;
-                return ECardResult::IOERROR;
         tmpBuf += cacheSize;
         rem -= cacheSize;
         blockOffset += cacheSize;
@@ -432,7 +461,6 @@ ECardResult Card::read(FileHandle& fh, void* dst, size_t size)
         }
     }
     fh.offset += size;
-    }
 
     return ECardResult::READY;
 }
@@ -583,6 +611,10 @@ ECardResult Card::getStatus(const FileHandle& fh, CardStat& statOut) const
 
 ECardResult Card::getStatus(uint32_t fileNo, CardStat& statOut) const
 {
+    ECardResult openRes = const_cast<Card*>(this)->_pumpOpen();
+    if (openRes != ECardResult::READY)
+        return openRes;
+
     const File* file = const_cast<Directory&>(m_dirs[m_currentDir]).getFile(fileNo);
     if (!file || file->m_game[0] == 0xFF)
         return ECardResult::NOFILE;
@@ -649,6 +681,10 @@ ECardResult Card::setStatus(const FileHandle& fh, const CardStat& stat)
 
 ECardResult Card::setStatus(uint32_t fileNo, const CardStat& stat)
 {
+    ECardResult openRes = _pumpOpen();
+    if (openRes != ECardResult::READY)
+        return openRes;
+
     Directory dir = m_dirs[m_currentDir];
     File* file = dir.getFile(fileNo);
     if (!file || file->m_game[0] == 0xFF)
@@ -664,6 +700,7 @@ ECardResult Card::setStatus(uint32_t fileNo, const CardStat& stat)
     return ECardResult::READY;
 }
 
+#if 0 // TODO: Async-friendly implementations
 bool Card::copyFileTo(FileHandle& fh, Card& dest)
 {
     if (!canCopy(fh))
@@ -722,6 +759,7 @@ bool Card::moveFileTo(FileHandle& fh, Card& dest)
 
     return false;
 }
+#endif
 
 void Card::setCurrentGame(const char* game)
 {
@@ -768,19 +806,19 @@ const uint8_t* Card::getCurrentMaker() const
 
 void Card::getSerial(uint64_t& serial)
 {
-    _swapEndian();
+    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)));
     serial = uint64_t(serialBuf[0] ^ serialBuf[2] ^ serialBuf[4] ^ serialBuf[6]) << 32 |
              (serialBuf[1] ^ serialBuf[3] ^ serialBuf[5] ^ serialBuf[7]);
-    _swapEndian();
+    m_ch._swapEndian();
 }
 
 void Card::getChecksum(uint16_t& checksum, uint16_t& inverse)
 {
-    checksum = m_checksum;
+    checksum = m_ch.m_checksum;
-    inverse = m_checksumInv;
+    inverse = m_ch.m_checksumInv;
 }
 
 void Card::getFreeBlocks(int32_t& bytesNotUsed, int32_t& filesNotUsed)
@@ -789,26 +827,28 @@ void Card::getFreeBlocks(int32_t& bytesNotUsed, int32_t& filesNotUsed)
     filesNotUsed = m_dirs[m_currentDir].numFreeFiles();
 }
 
+static std::unique_ptr<uint8_t[]> DummyBlock;
+
 void Card::format(ECardSlot id, ECardSize size, EEncoding encoding)
 {
     memset(__raw, 0xFF, BlockSize);
     uint64_t rand = uint64_t(getGCTime());
-    m_formatTime = rand;
+    m_ch.m_formatTime = rand;
     for (int i = 0; i < 12; i++)
     {
         rand = (((rand * uint64_t(0x41c64e6d)) + uint64_t(0x3039)) >> 16);
-        m_serial[i] = uint8_t(g_SRAM.flash_id[uint32_t(id)][i] + uint32_t(rand));
+        m_ch.m_serial[i] = uint8_t(g_SRAM.flash_id[uint32_t(id)][i] + uint32_t(rand));
         rand = (((rand * uint64_t(0x41c64e6d)) + uint64_t(0x3039)) >> 16);
         rand &= uint64_t(0x7fffULL);
     }
 
-    m_sramBias = int32_t(SBig(g_SRAM.counter_bias));
+    m_ch.m_sramBias = int32_t(SBig(g_SRAM.counter_bias));
-    m_sramLanguage = uint32_t(SBig(g_SRAM.lang));
+    m_ch.m_sramLanguage = uint32_t(SBig(g_SRAM.lang));
-    m_unknown = 0; /* 1 works for slot A, 0 both */
+    m_ch.m_unknown = 0; /* 1 works for slot A, 0 both */
-    m_deviceId = 0;
+    m_ch.m_deviceId = 0;
-    m_sizeMb = uint16_t(size);
+    m_ch.m_sizeMb = uint16_t(size);
-    m_maxBlock = m_sizeMb * MbitToBlocks;
+    m_maxBlock = m_ch.m_sizeMb * MbitToBlocks;
-    m_encoding = uint16_t(encoding);
+    m_ch.m_encoding = uint16_t(encoding);
     _updateChecksum();
     m_dirs[0] = Directory();
     m_dirs[1] = m_dirs[0];
@@ -817,34 +857,35 @@ void Card::format(ECardSlot id, ECardSize size, EEncoding encoding)
     m_currentDir = 1;
     m_currentBat = 1;
 
-    if (m_fileHandle)
+    m_fileHandle = {};
-        fclose(m_fileHandle);
+    m_fileHandle = AsyncIO(m_filename.c_str(), true);
-
-    m_fileHandle = Fopen(m_filename.c_str(), _S("wb"));
 
     if (m_fileHandle)
     {
-        _swapEndian();
+        m_tmpCh = m_ch;
-        fwrite(__raw, 1, BlockSize, m_fileHandle);
+        m_tmpCh._swapEndian();
-        _swapEndian();
+        m_fileHandle.asyncWrite(0, &m_tmpCh, BlockSize, 0);
-        Directory tmpDir = m_dirs[0];
+        m_tmpDirs[0] = m_dirs[0];
-        tmpDir.swapEndian();
+        m_tmpDirs[0].swapEndian();
-        fwrite(tmpDir.__raw, 1, BlockSize, m_fileHandle);
+        m_fileHandle.asyncWrite(1, m_tmpDirs[0].__raw, BlockSize, BlockSize * 1);
-        tmpDir = m_dirs[1];
+        m_tmpDirs[1] = m_dirs[1];
-        tmpDir.swapEndian();
+        m_tmpDirs[1].swapEndian();
-        fwrite(tmpDir.__raw, 1, BlockSize, m_fileHandle);
+        m_fileHandle.asyncWrite(2, m_tmpDirs[1].__raw, BlockSize, BlockSize * 2);
-        BlockAllocationTable tmpBat = m_bats[0];
+        m_tmpBats[0] = m_bats[0];
-        tmpBat.swapEndian();
+        m_tmpBats[0].swapEndian();
-        fwrite(tmpBat.__raw, 1, BlockSize, m_fileHandle);
+        m_fileHandle.asyncWrite(3, m_tmpBats[0].__raw, BlockSize, BlockSize * 3);
-        tmpBat = m_bats[1];
+        m_tmpBats[1] = m_bats[1];
-        tmpBat.swapEndian();
+        m_tmpBats[1].swapEndian();
-        fwrite(tmpBat.__raw, 1, BlockSize, m_fileHandle);
+        m_fileHandle.asyncWrite(4, m_tmpBats[1].__raw, BlockSize, BlockSize * 4);
-        uint32_t dataLen = ((uint32_t(size) * MbitToBlocks) - 5) * BlockSize;
+        if (!DummyBlock)
-        std::unique_ptr<uint8_t[]> data(new uint8_t[dataLen]);
+        {
-        memset(data.get(), 0xFF, dataLen);
+            DummyBlock.reset(new uint8_t[BlockSize]);
-        fwrite(data.get(), 1, dataLen, m_fileHandle);
+            memset(DummyBlock.get(), 0xFF, BlockSize);
-        fclose(m_fileHandle);
+        }
-        m_fileHandle = Fopen(m_filename.c_str(), _S("r+b"));
+        uint32_t blockCount = (uint32_t(size) * MbitToBlocks) - 5;
+        for (uint32_t i=0 ; i<blockCount ; ++i)
+            m_fileHandle.asyncWrite(i + 5, DummyBlock.get(), BlockSize, BlockSize * (i + 5));
+        m_dirty = false;
     }
 }
 
@@ -858,54 +899,80 @@ ProbeResults Card::probeCardFile(SystemStringView filename)
 
 void Card::commit()
 {
+    if (!m_dirty)
+        return;
     if (m_fileHandle)
     {
-        rewind(m_fileHandle);
+        m_tmpCh = m_ch;
-
+        m_tmpCh._swapEndian();
-        _swapEndian();
+        m_fileHandle.asyncWrite(0, &m_tmpCh, BlockSize, 0);
-        fwrite(__raw, 1, BlockSize, m_fileHandle);
+        m_tmpDirs[0] = m_dirs[0];
-        _swapEndian();
+        m_tmpDirs[0].updateChecksum();
-        Directory tmpDir = m_dirs[0];
+        m_tmpDirs[0].swapEndian();
-        tmpDir.updateChecksum();
+        m_fileHandle.asyncWrite(1, m_tmpDirs[0].__raw, BlockSize, BlockSize * 1);
-        tmpDir.swapEndian();
+        m_tmpDirs[1] = m_dirs[1];
-        fwrite(tmpDir.__raw, 1, BlockSize, m_fileHandle);
+        m_tmpDirs[1].updateChecksum();
-        tmpDir = m_dirs[1];
+        m_tmpDirs[1].swapEndian();
-        tmpDir.updateChecksum();
+        m_fileHandle.asyncWrite(2, m_tmpDirs[1].__raw, BlockSize, BlockSize * 2);
-        tmpDir.swapEndian();
+        m_tmpBats[0] = m_bats[0];
-        fwrite(tmpDir.__raw, 1, BlockSize, m_fileHandle);
+        m_tmpBats[0].updateChecksum();
-        BlockAllocationTable tmpBat = m_bats[0];
+        m_tmpBats[0].swapEndian();
-        tmpBat.updateChecksum();
+        m_fileHandle.asyncWrite(3, m_tmpBats[0].__raw, BlockSize, BlockSize * 3);
-        tmpBat.swapEndian();
+        m_tmpBats[1] = m_bats[1];
-        fwrite(tmpBat.__raw, 1, BlockSize, m_fileHandle);
+        m_tmpBats[1].updateChecksum();
-        tmpBat = m_bats[1];
+        m_tmpBats[1].swapEndian();
-        tmpBat.updateChecksum();
+        m_fileHandle.asyncWrite(4, m_tmpBats[1].__raw, BlockSize, BlockSize * 4);
-        tmpBat.swapEndian();
+        m_dirty = false;
-        fwrite(tmpBat.__raw, 1, BlockSize, m_fileHandle);
-
-        fflush(m_fileHandle);
     }
 }
 
+bool Card::open(SystemStringView filepath)
+{
+    m_opened = false;
+    m_filename = filepath;
+    m_fileHandle = AsyncIO(m_filename);
+    if (m_fileHandle)
+    {
+        m_fileHandle.resizeQueue(5);
+        m_fileHandle.asyncRead(0, __raw, BlockSize, 0);
+        m_fileHandle.asyncRead(1, m_dirs[0].__raw, BlockSize, BlockSize * 1);
+        m_fileHandle.asyncRead(2, m_dirs[1].__raw, BlockSize, BlockSize * 2);
+        m_fileHandle.asyncRead(3, m_bats[0].__raw, BlockSize, BlockSize * 3);
+        m_fileHandle.asyncRead(4, m_bats[1].__raw, BlockSize, BlockSize * 4);
+        return true;
+    }
+    return false;
+}
+
 void Card::close()
 {
+    m_opened = false;
     if (m_fileHandle)
     {
         commit();
-        fclose(m_fileHandle);
+        m_fileHandle.waitForCompletion();
-        m_fileHandle = nullptr;
+        m_fileHandle = {};
     }
 }
 
 ECardResult Card::getError() const
 {
-    if (m_fileHandle == nullptr)
+    if (!m_fileHandle)
         return ECardResult::NOCARD;
 
+    ECardResult pollRes = m_fileHandle.pollStatus();
+    if (pollRes != ECardResult::READY)
+        return pollRes;
+
+    ECardResult openRes = const_cast<Card*>(this)->_pumpOpen();
+    if (openRes != ECardResult::READY)
+        return openRes;
+
     uint16_t ckSum, ckSumInv;
-    const_cast<Card&>(*this)._swapEndian();
+    const_cast<Card&>(*this).m_ch._swapEndian();
     calculateChecksumBE(reinterpret_cast<const uint16_t*>(__raw), 0xFE, &ckSum, &ckSumInv);
-    bool res = (ckSum == m_checksum && ckSumInv == m_checksumInv);
+    bool res = (ckSum == m_ch.m_checksum && ckSumInv == m_ch.m_checksumInv);
-    const_cast<Card&>(*this)._swapEndian();
+    const_cast<Card&>(*this).m_ch._swapEndian();
 
     if (!res)
         return ECardResult::BROKEN;

test/main.cpp

@@ -23,9 +23,9 @@ int main()
         mc.setCanMove(f, true);
         kabufuda::CardStat stat = {};
         mc.setStatus(f, stat);
-        mc.write(f, "Test\0", strlen("Test") + 1);
+        mc.asyncWrite(f, "Test\0", strlen("Test") + 1);
         mc.seek(f, 32, kabufuda::SeekOrigin::Begin);
-        mc.write(f, "Test\0", strlen("Test") + 1);
+        mc.asyncWrite(f, "Test\0", strlen("Test") + 1);
     }
     return 0;
 }