48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
#include "icsneo/disk/fat.h"
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#include "icsneo/disk/diskdriver.h"
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#include "ff.h"
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#include "diskio.h"
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#include <mutex>
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using namespace icsneo;
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// The FAT driver can only be accessed by one caller at a time, since it relies on globals
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static std::mutex fatDriverMutex;
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static std::function< std::optional<uint64_t>(uint64_t pos, uint8_t* into, uint64_t amount) > diskReadFn;
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extern "C" DRESULT disk_read(BYTE, BYTE* buff, LBA_t sector, UINT count) {
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static_assert(Disk::SectorSize == 512, "FatFs expects 512 byte sectors");
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const uint64_t expected = count * uint64_t(Disk::SectorSize);
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const auto res = diskReadFn(sector * uint64_t(Disk::SectorSize), buff, expected);
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if (!res.has_value())
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return RES_NOTRDY;
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return res == expected ? RES_OK : RES_ERROR;
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}
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extern "C" DSTATUS disk_initialize(BYTE) {
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return RES_OK;
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}
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extern "C" DSTATUS disk_status(BYTE) {
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return RES_OK;
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}
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static uint64_t ClusterToSector(const FATFS& fs, DWORD cluster) {
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return fs.database + (LBA_t)fs.csize * (cluster - 2);
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}
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std::optional<uint64_t> Disk::FindVSAInFAT(std::function< std::optional<uint64_t>(uint64_t pos, uint8_t* into, uint64_t amount) > diskRead) {
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std::lock_guard<std::mutex> lk(fatDriverMutex);
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diskReadFn = diskRead;
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FATFS fs = {};
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if (f_mount(&fs, (const TCHAR*)_TEXT(""), 0) != FR_OK)
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return std::nullopt;
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FIL logData = {};
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if (f_open(&logData, (const TCHAR*)_TEXT("0:\\LOG_DATA.VSA"), FA_READ) != FR_OK)
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return std::nullopt;
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return ClusterToSector(fs, logData.obj.sclust) * uint64_t(Disk::SectorSize);
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} |