304 lines
6.5 KiB
C
304 lines
6.5 KiB
C
/*
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* File : dfs_romfs.c
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* This file is part of Device File System in RT-Thread RTOS
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* COPYRIGHT (C) 2004-2011, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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*/
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#include <rtthread.h>
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#include <dfs.h>
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#include <dfs_fs.h>
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#include "dfs_romfs.h"
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int dfs_romfs_mount(struct dfs_filesystem *fs, unsigned long rwflag, const void *data)
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{
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struct romfs_dirent *root_dirent;
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if (data == RT_NULL)
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return -DFS_STATUS_EIO;
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root_dirent = (struct romfs_dirent *)data;
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fs->data = root_dirent;
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return DFS_STATUS_OK;
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}
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int dfs_romfs_unmount(struct dfs_filesystem *fs)
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{
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return DFS_STATUS_OK;
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}
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int dfs_romfs_ioctl(struct dfs_fd *file, int cmd, void *args)
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{
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return -DFS_STATUS_EIO;
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}
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struct romfs_dirent *dfs_romfs_lookup(struct romfs_dirent *root_dirent, const char *path, rt_size_t *size)
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{
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rt_size_t index, found;
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const char *subpath, *subpath_end;
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struct romfs_dirent *dirent;
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rt_size_t dirent_size;
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if (path[0] == '/' && path[1] == '\0')
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{
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*size = root_dirent->size;
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return root_dirent;
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}
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/* goto root directy entries */
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dirent = (struct romfs_dirent *)root_dirent->data;
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dirent_size = root_dirent->size;
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/* get the end position of this subpath */
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subpath_end = path;
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/* skip /// */
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while (*subpath_end && *subpath_end == '/')
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subpath_end ++;
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subpath = subpath_end;
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while ((*subpath_end != '/') && *subpath_end)
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subpath_end ++;
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while (dirent != RT_NULL)
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{
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found = 0;
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/* search in folder */
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for (index = 0; index < dirent_size; index ++)
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{
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if (rt_strncmp(dirent[index].name, subpath, (subpath_end - subpath)) == 0)
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{
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dirent_size = dirent[index].size;
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/* skip /// */
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while (*subpath_end && *subpath_end == '/')
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subpath_end ++;
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subpath = subpath_end;
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while ((*subpath_end != '/') && *subpath_end)
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subpath_end ++;
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if (!(*subpath))
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{
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*size = dirent_size;
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return &dirent[index];
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}
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if (dirent[index].type == ROMFS_DIRENT_DIR)
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{
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/* enter directory */
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dirent = (struct romfs_dirent*)dirent[index].data;
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found = 1;
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break;
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}
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else
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{
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/* return file dirent */
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if (subpath != RT_NULL)
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break; /* not the end of path */
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return &dirent[index];
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}
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}
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}
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if (!found)
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break; /* not found */
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}
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/* not found */
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return RT_NULL;
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}
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int dfs_romfs_read(struct dfs_fd *file, void *buf, rt_size_t count)
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{
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rt_size_t length;
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struct romfs_dirent *dirent;
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dirent = (struct romfs_dirent *)file->data;
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RT_ASSERT(dirent != RT_NULL);
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if (count < file->size - file->pos)
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length = count;
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else
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length = file->size - file->pos;
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if (length > 0)
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memcpy(buf, &(dirent->data[file->pos]), length);
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/* update file current position */
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file->pos += length;
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return length;
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}
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int dfs_romfs_lseek(struct dfs_fd *file, rt_off_t offset)
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{
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if (offset <= file->size)
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{
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file->pos = offset;
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return file->pos;
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}
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return -DFS_STATUS_EIO;
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}
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int dfs_romfs_close(struct dfs_fd *file)
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{
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file->data = RT_NULL;
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return DFS_STATUS_OK;
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}
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int dfs_romfs_open(struct dfs_fd *file)
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{
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rt_size_t size;
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struct romfs_dirent *dirent;
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struct romfs_dirent *root_dirent;
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root_dirent = (struct romfs_dirent *)file->fs->data;
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if (file->flags & (DFS_O_CREAT | DFS_O_WRONLY | DFS_O_APPEND | DFS_O_TRUNC | DFS_O_RDWR))
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return -DFS_STATUS_EINVAL;
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dirent = dfs_romfs_lookup(root_dirent, file->path, &size);
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if (dirent == RT_NULL)
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return -DFS_STATUS_ENOENT;
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/* entry is a directory file type */
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if (dirent->type == ROMFS_DIRENT_DIR)
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{
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if (!(file->flags & DFS_O_DIRECTORY))
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return -DFS_STATUS_ENOENT;
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}
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else
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{
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/* entry is a file, but open it as a directory */
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if (file->flags & DFS_O_DIRECTORY)
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return -DFS_STATUS_ENOENT;
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}
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file->data = dirent;
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file->size = size;
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file->pos = 0;
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return DFS_STATUS_OK;
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}
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int dfs_romfs_stat(struct dfs_filesystem *fs, const char *path, struct stat *st)
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{
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rt_size_t size;
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struct romfs_dirent *dirent;
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struct romfs_dirent *root_dirent;
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root_dirent = (struct romfs_dirent *)fs->data;
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dirent = dfs_romfs_lookup(root_dirent, path, &size);
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if (dirent == RT_NULL)
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return -DFS_STATUS_ENOENT;
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st->st_dev = 0;
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st->st_mode = DFS_S_IFREG | DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |
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DFS_S_IWUSR | DFS_S_IWGRP | DFS_S_IWOTH;
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if (dirent->type == ROMFS_DIRENT_DIR)
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{
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st->st_mode &= ~DFS_S_IFREG;
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st->st_mode |= DFS_S_IFDIR | DFS_S_IXUSR | DFS_S_IXGRP | DFS_S_IXOTH;
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}
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st->st_size = dirent->size;
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st->st_mtime = 0;
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st->st_blksize = 512;
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return DFS_STATUS_OK;
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}
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int dfs_romfs_getdents(struct dfs_fd *file, struct dirent *dirp, rt_uint32_t count)
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{
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rt_size_t index;
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const char *name;
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struct dirent *d;
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struct romfs_dirent *dirent, *sub_dirent;
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dirent = (struct romfs_dirent *)file->data;
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RT_ASSERT(dirent->type == ROMFS_DIRENT_DIR);
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/* enter directory */
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dirent = (struct romfs_dirent *)dirent->data;
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/* make integer count */
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count = (count / sizeof(struct dirent));
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if (count == 0)
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return -DFS_STATUS_EINVAL;
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index = 0;
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for (index = 0; index < count && file->pos < file->size; index ++)
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{
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d = dirp + index;
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sub_dirent = &dirent[file->pos];
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name = sub_dirent->name;
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/* fill dirent */
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if (sub_dirent->type == ROMFS_DIRENT_DIR)
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d->d_type = DFS_DT_DIR;
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else
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d->d_type = DFS_DT_REG;
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d->d_namlen = rt_strlen(name);
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d->d_reclen = (rt_uint16_t)sizeof(struct dirent);
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rt_strncpy(d->d_name, name, rt_strlen(name) + 1);
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/* move to next position */
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++ file->pos;
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}
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return index * sizeof(struct dirent);
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}
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static const struct dfs_filesystem_operation _romfs =
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{
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"rom",
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DFS_FS_FLAG_DEFAULT,
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dfs_romfs_mount,
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dfs_romfs_unmount,
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RT_NULL,
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RT_NULL,
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dfs_romfs_open,
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dfs_romfs_close,
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dfs_romfs_ioctl,
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dfs_romfs_read,
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RT_NULL,
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RT_NULL,
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dfs_romfs_lseek,
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dfs_romfs_getdents,
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RT_NULL,
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dfs_romfs_stat,
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RT_NULL,
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};
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int dfs_romfs_init(void)
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{
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/* register rom file system */
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dfs_register(&_romfs);
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return 0;
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}
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INIT_FS_EXPORT(dfs_romfs_init);
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