FATDirHandle.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2012 ARM Limited
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00020  * SOFTWARE.
00021  */
00022 #include <string.h>
00023 #include "ff.h"
00024 #include "FATDirHandle.h"
00025 
00026 using namespace mbed;
00027 
00028 FATDirHandle::FATDirHandle(const FATFS_DIR &the_dir, PlatformMutex * mutex): _mutex(mutex) {
00029     dir = the_dir;
00030 }
00031 
00032 int FATDirHandle::closedir() {
00033     lock();
00034     int retval = f_closedir(&dir);
00035     unlock();
00036     delete this;
00037     return retval;
00038 }
00039 
00040 struct dirent *FATDirHandle::readdir() {
00041     FILINFO finfo;
00042 
00043     lock();
00044 #if _USE_LFN
00045     finfo.lfname = cur_entry.d_name;
00046     finfo.lfsize = sizeof(cur_entry.d_name);
00047 #endif // _USE_LFN
00048 
00049     FRESULT res = f_readdir(&dir, &finfo);
00050 
00051 #if _USE_LFN
00052     if(res != 0 || finfo.fname[0]==0) {
00053         unlock();
00054         return NULL;
00055     } else {
00056         if(cur_entry.d_name[0]==0) {
00057             // No long filename so use short filename.
00058             memcpy(cur_entry.d_name, finfo.fname, sizeof(finfo.fname));
00059         }
00060         unlock();
00061         return &cur_entry;
00062     }
00063 #else
00064     if(res != 0 || finfo.fname[0]==0) {
00065         unlock();
00066         return NULL;
00067     } else {
00068         memcpy(cur_entry.d_name, finfo.fname, sizeof(finfo.fname));
00069         unlock();
00070         return &cur_entry;
00071     }
00072 #endif /* _USE_LFN */
00073 }
00074 
00075 void FATDirHandle::rewinddir() {
00076     lock();
00077     dir.index = 0;
00078     unlock();
00079 }
00080 
00081 off_t FATDirHandle::telldir() {
00082     lock();
00083     off_t offset = dir.index;
00084     unlock();
00085     return offset;
00086 }
00087 
00088 void FATDirHandle::seekdir(off_t location) {
00089     lock();
00090     dir.index = location;
00091     unlock();
00092 }
00093 
00094 void FATDirHandle::lock() {
00095     _mutex->lock();
00096 }
00097 
00098 void FATDirHandle::unlock() {
00099     _mutex->unlock();
00100 }
00101