micropython/extmod/vfs_fat_ffconf.c

/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "py/mpconfig.h"
#if MICROPY_FSUSERMOUNT

#include <string.h>

#include "py/mpstate.h"
#if MICROPY_FATFS_OO
#include "lib/oofatfs/ff.h"
#else
#include "lib/fatfs/ff.h"
#endif
#include "extmod/fsusermount.h"
#include "extmod/vfs_fat_file.h"

STATIC bool check_path(const TCHAR **path, const char *mount_point_str, mp_uint_t mount_point_len) {
    if (strncmp(*path, mount_point_str, mount_point_len) == 0) {
        if ((*path)[mount_point_len] == '/') {
            *path += mount_point_len;
            return true;
        } else if ((*path)[mount_point_len] == '\0') {
            *path = "/";
            return true;
        }
    }
    return false;
}

#if MICROPY_FATFS_OO

STATIC fs_user_mount_t *vfs_cur_obj = NULL;

// "path" is the path to lookup; will advance this pointer beyond the volume name.
// Returns a pointer to the VFS object, NULL means path not found.
fs_user_mount_t *ff_get_vfs(const char **path) {
    if (!(*path)) {
        return NULL;
    }

    if (**path != '/') {
        #if _FS_RPATH
        return vfs_cur_obj;
        #else
        return NULL;
        #endif
    }

    for (size_t i = 0; i < MP_ARRAY_SIZE(MP_STATE_PORT(fs_user_mount)); ++i) {
        fs_user_mount_t *vfs = MP_STATE_PORT(fs_user_mount)[i];
        if (vfs != NULL && check_path(path, vfs->str, vfs->len)) {
            return vfs;
        }
    }

    return NULL;
}

#else

// "path" is the path to lookup; will advance this pointer beyond the volume name.
// Returns logical drive number (-1 means invalid path).
int ff_get_ldnumber (const TCHAR **path) {
    if (!(*path)) {
        return -1;
    }

    if (**path != '/') {
        #if _FS_RPATH
        return ff_CurrVol;
        #else
        return -1;
        #endif
    }

    for (size_t i = 0; i < MP_ARRAY_SIZE(MP_STATE_PORT(fs_user_mount)); ++i) {
        fs_user_mount_t *vfs = MP_STATE_PORT(fs_user_mount)[i];
        if (vfs != NULL && check_path(path, vfs->str, vfs->len)) {
            return i;
        }
    }

    return -1;
}

void ff_get_volname(BYTE vol, TCHAR **dest) {
    fs_user_mount_t *vfs = MP_STATE_PORT(fs_user_mount)[vol];
    memcpy(*dest, vfs->str, vfs->len);
    *dest += vfs->len;
}

#endif

#endif // MICROPY_FSUSERMOUNT