libnx/nx/source/services/fs.c

// Copyright 2017 plutoo
#include <string.h>
#include "types.h"
#include "result.h"
#include "arm/atomics.h"
#include "kernel/ipc.h"
#include "services/fs.h"
#include "services/sm.h"

static Service g_fsSrv;
static u64 g_refCnt;

Result fsInitialize(void)
{
    atomicIncrement64(&g_refCnt);

    if (serviceIsActive(&g_fsSrv))
        return 0;

    Result rc = smGetService(&g_fsSrv, "fsp-srv");

    if (R_SUCCEEDED(rc)) {
        IpcCommand c;
        ipcInitialize(&c);
        ipcSendPid(&c);

        struct {
            u64 magic;
            u64 cmd_id;
            u64 unk;
        } *raw;

        raw = ipcPrepareHeader(&c, sizeof(*raw));

        raw->magic = SFCI_MAGIC;
        raw->cmd_id = 1;
        raw->unk = 0;

        rc = serviceIpcDispatch(&g_fsSrv);

        if (R_SUCCEEDED(rc)) {
            IpcParsedCommand r;
            ipcParse(&r);

            struct {
                u64 magic;
                u64 result;
            } *resp = r.Raw;

            rc = resp->result;
        }
    }

    return rc;
}

void fsExit(void)
{
    if (atomicDecrement64(&g_refCnt) == 0)
        serviceClose(&g_fsSrv);
}

Service* fsGetServiceSession(void) {
    return &g_fsSrv;
}

Result fsMountSdcard(FsFileSystem* out) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 18;

    Result rc = serviceIpcDispatch(&g_fsSrv);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            serviceCreate(&out->s, r.Handles[0]);
        }
    }

    return rc;
}

Result fsMountSaveData(FsFileSystem* out, u8 inval, FsSave *save) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
        u64 inval;//Actually u8.
        FsSave save;
    } PACKED *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 51;
    raw->inval = (u64)inval;
    memcpy(&raw->save, save, sizeof(FsSave));

    Result rc = serviceIpcDispatch(&g_fsSrv);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            serviceCreate(&out->s, r.Handles[0]);
        }
    }

    return rc;
}

Result fsMountSystemSaveData(FsFileSystem* out, u8 inval, FsSave *save) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
        u64 inval;//Actually u8.
        FsSave save;
    } PACKED *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 52;
    raw->inval = (u64)inval;
    memcpy(&raw->save, save, sizeof(FsSave));

    Result rc = serviceIpcDispatch(&g_fsSrv);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            serviceCreate(&out->s, r.Handles[0]);
        }
    }

    return rc;
}

Result fsOpenSaveDataIterator(FsSaveDataIterator* out, s32 SaveDataSpaceId) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    struct {
        u64 magic;
        u64 cmd_id;
        u8 SaveDataSpaceId;
    } *raw2;

    if (SaveDataSpaceId == FsSaveDataSpaceId_All) {
        raw = ipcPrepareHeader(&c, sizeof(*raw));

        raw->magic = SFCI_MAGIC;
        raw->cmd_id = 60;
    }
    else {
        raw2 = ipcPrepareHeader(&c, sizeof(*raw2));

        raw2->magic = SFCI_MAGIC;
        raw2->cmd_id = 61;
        raw2->SaveDataSpaceId = SaveDataSpaceId;
    }

    Result rc = serviceIpcDispatch(&g_fsSrv);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            serviceCreate(&out->s, r.Handles[0]);
        }
    }

    return rc;
}

Result fsOpenDataStorageByCurrentProcess(FsStorage* out) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 200;

    Result rc = serviceIpcDispatch(&g_fsSrv);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            serviceCreate(&out->s, r.Handles[0]);
        }
    }

    return rc;
}

Result fsOpenDeviceOperator(FsDeviceOperator* out) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 400;

    Result rc = serviceIpcDispatch(&g_fsSrv);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            serviceCreate(&out->s, r.Handles[0]);
        }
    }

    return rc;
}

Result fsOpenSdCardDetectionEventNotifier(FsEventNotifier* out) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 500;

    Result rc = serviceIpcDispatch(&g_fsSrv);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            serviceCreate(&out->s, r.Handles[0]);
        }
    }

    return rc;
}

// Wrapper(s) for fsMountSaveData.
Result fsMount_SaveData(FsFileSystem* out, u64 titleID, u128 userID) {
    FsSave save;

    memset(&save, 0, sizeof(save));
    save.titleID = titleID;
    save.userID = userID;
    save.SaveDataType = FsSaveDataType_SaveData;

    return fsMountSaveData(out, FsSaveDataSpaceId_NandUser, &save);
}

Result fsMount_SystemSaveData(FsFileSystem* out, u64 saveID) {
    FsSave save;

    memset(&save, 0, sizeof(save));
    save.saveID = saveID;
    save.SaveDataType = FsSaveDataType_SystemSaveData;

    return fsMountSystemSaveData(out, FsSaveDataSpaceId_NandSystem, &save);
}

// IFileSystem impl
Result fsFsCreateFile(FsFileSystem* fs, const char* path, size_t size, int flags) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
        u64 zero;
        u64 size;
        u32 flags;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 0;
    raw->zero = 0;
    raw->size = size;
    raw->flags = flags;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

Result fsFsDeleteFile(FsFileSystem* fs, const char* path) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 1;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

Result fsFsCreateDirectory(FsFileSystem* fs, const char* path) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 2;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

Result fsFsDeleteDirectory(FsFileSystem* fs, const char* path) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 3;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

Result fsFsDeleteDirectoryRecursively(FsFileSystem* fs, const char* path) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 4;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

Result fsFsRenameFile(FsFileSystem* fs, const char* path0, const char* path1) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path0, FS_MAX_PATH, 0);
    ipcAddSendStatic(&c, path1, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 5;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

Result fsFsRenameDirectory(FsFileSystem* fs, const char* path0, const char* path1) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path0, FS_MAX_PATH, 0);
    ipcAddSendStatic(&c, path1, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 6;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

Result fsFsGetEntryType(FsFileSystem* fs, const char* path, FsEntryType* out) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 7;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
            u32 type;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            *out = resp->type;
        }
    }

    return rc;
}

Result fsFsOpenFile(FsFileSystem* fs, const char* path, int flags, FsFile* out) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
        u32 flags;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 8;
    raw->flags = flags;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            serviceCreate(&out->s, r.Handles[0]);
        }
    }

    return rc;
}

Result fsFsOpenDirectory(FsFileSystem* fs, const char* path, int flags, FsDir* out) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
        u32 flags;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 9;
    raw->flags = flags;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            serviceCreate(&out->s, r.Handles[0]);
        }
    }

    return rc;
}

Result fsFsCommit(FsFileSystem* fs) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 10;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

Result fsFsGetFreeSpace(FsFileSystem* fs, const char* path, u64* out) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 11;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
            u64 space;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            *out = resp->space;
        }
    }

    return rc;
}

Result fsFsGetTotalSpace(FsFileSystem* fs, const char* path, u64* out) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendStatic(&c, path, FS_MAX_PATH, 0);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 12;

    Result rc = serviceIpcDispatch(&fs->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
            u64 space;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            *out = resp->space;
        }
    }

    return rc;
}

void fsFsClose(FsFileSystem* fs) {
    serviceClose(&fs->s);
}

// IFile implementation
Result fsFileRead(FsFile* f, u64 off, void* buf, size_t len, size_t* out) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddRecvBuffer(&c, buf, len, 1);

    struct {
        u64 magic;
        u64 cmd_id;
        u64 zero;
        u64 offset;
        u64 read_size;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 0;
    raw->zero = 0;
    raw->offset = off;
    raw->read_size = len;

    Result rc = serviceIpcDispatch(&f->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
            u64 bytes_read;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            *out = resp->bytes_read;
        }
    }

    return rc;
}

Result fsFileWrite(FsFile* f, u64 off, const void* buf, size_t len) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddSendBuffer(&c, buf, len, 1);

    struct {
        u64 magic;
        u64 cmd_id;
        u64 zero;
        u64 offset;
        u64 write_size;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 1;
    raw->zero = 0;
    raw->offset = off;
    raw->write_size = len;

    Result rc = serviceIpcDispatch(&f->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

Result fsFileFlush(FsFile* f) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 2;

    Result rc = serviceIpcDispatch(&f->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

Result fsFileSetSize(FsFile* f, u64 sz) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
        u64 size;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 3;
    raw->size = sz;

    Result rc = serviceIpcDispatch(&f->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

Result fsFileGetSize(FsFile* f, u64* out) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 4;

    Result rc = serviceIpcDispatch(&f->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
            u64 size;
        } *resp = r.Raw;

        rc = resp->result;
        if (R_SUCCEEDED(rc) && out) *out = resp->size;
    }

    return rc;
}

void fsFileClose(FsFile* f) {
    serviceClose(&f->s);
}

// IDirectory implementation
void fsDirClose(FsDir* d) {
    serviceClose(&d->s);
}

Result fsDirRead(FsDir* d, u64 inval, size_t* total_entries, size_t max_entries, FsDirectoryEntry *buf) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddRecvBuffer(&c, buf, sizeof(FsDirectoryEntry)*max_entries, 0);

    struct {
        u64 magic;
        u64 cmd_id;
        u64 inval;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 0;
    raw->inval = inval;

    Result rc = serviceIpcDispatch(&d->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
            u64 total_entries;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            if (total_entries) *total_entries = resp->total_entries;
        }
    }

    return rc;
}

Result fsDirGetEntryCount(FsDir* d, u64* count) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 1;

    Result rc = serviceIpcDispatch(&d->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
            u64 count;
        } *resp = r.Raw;

        rc = resp->result;
        if (R_SUCCEEDED(rc) && count) *count = resp->count;
    }

    return rc;
}

// IStorage implementation
Result fsStorageRead(FsStorage* s, u64 off, void* buf, size_t len) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddRecvBuffer(&c, buf, len, 1);

    struct {
        u64 magic;
        u64 cmd_id;
        u64 offset;
        u64 read_size;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 0;
    raw->offset = off;
    raw->read_size = len;

    Result rc = serviceIpcDispatch(&s->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;
    }

    return rc;
}

void fsStorageClose(FsStorage* s) {
    serviceClose(&s->s);
}

// ISaveDataInfoReader
Result fsSaveDataIteratorRead(FsSaveDataIterator *s, FsSaveDataInfo* buf, size_t max_entries, size_t* total_entries) {
    IpcCommand c;
    ipcInitialize(&c);
    ipcAddRecvBuffer(&c, buf, sizeof(FsSaveDataInfo)*max_entries, 0);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 0;

    Result rc = serviceIpcDispatch(&s->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
            u64 total_entries;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            if (total_entries) *total_entries = resp->total_entries;
        }
    }

    return rc;
}

void fsSaveDataIteratorClose(FsSaveDataIterator* s) {
    serviceClose(&s->s);
}

// IEventNotifier
Result fsEventNotifierGetEventHandle(FsEventNotifier* e, Handle* out) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 0;

    Result rc = serviceIpcDispatch(&e->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            *out = r.Handles[0];
        }
    }

    return rc;
}

void fsEventNotifierClose(FsEventNotifier* e) {
    serviceClose(&e->s);
}

// IDeviceOperator
Result fsDeviceOperatorIsSdCardInserted(FsDeviceOperator* d, bool* out) {
    IpcCommand c;
    ipcInitialize(&c);

    struct {
        u64 magic;
        u64 cmd_id;
    } *raw;

    raw = ipcPrepareHeader(&c, sizeof(*raw));

    raw->magic = SFCI_MAGIC;
    raw->cmd_id = 0;

    Result rc = serviceIpcDispatch(&d->s);

    if (R_SUCCEEDED(rc)) {
        IpcParsedCommand r;
        ipcParse(&r);

        struct {
            u64 magic;
            u64 result;
            u8 is_inserted;
        } *resp = r.Raw;

        rc = resp->result;

        if (R_SUCCEEDED(rc)) {
            *out = resp->is_inserted != 0;
        }
    }

    return rc;
}

void fsDeviceOperatorClose(FsDeviceOperator* d) {
    serviceClose(&d->s);
}