Maxim mbed development library
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LocalFileSystem.cpp
00001 /* mbed Microcontroller Library 00002 * Copyright (c) 2006-2013 ARM Limited 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 #include "drivers/LocalFileSystem.h" 00017 00018 #if DEVICE_LOCALFILESYSTEM 00019 00020 #include "platform/semihost_api.h" 00021 #include <string.h> 00022 #include <stdio.h> 00023 00024 namespace mbed { 00025 00026 /* Extension to FINFO type defined in RTL.h (in Keil RL) - adds 'create time'. */ 00027 typedef struct { 00028 unsigned char hr; /* Hours [0..23] */ 00029 unsigned char min; /* Minutes [0..59] */ 00030 unsigned char sec; /* Seconds [0..59] */ 00031 unsigned char day; /* Day [1..31] */ 00032 unsigned char mon; /* Month [1..12] */ 00033 unsigned short year; /* Year [1980..2107] */ 00034 } FTIME; 00035 00036 typedef struct { /* File Search info record */ 00037 char name[32]; /* File name */ 00038 long size; /* File size in bytes */ 00039 int fileID; /* System File Identification */ 00040 FTIME create_time; /* Date & time file was created */ 00041 FTIME write_time; /* Date & time of last write */ 00042 } XFINFO; 00043 00044 #define RESERVED_FOR_USER_APPLICATIONS (0x100) /* 0x100 - 0x1ff */ 00045 #define USR_XFFIND (RESERVED_FOR_USER_APPLICATIONS + 0) 00046 00047 static int xffind (const char *pattern, XFINFO *info) { 00048 unsigned param[4]; 00049 00050 param[0] = (unsigned long)pattern; 00051 param[1] = (unsigned long)strlen(pattern); 00052 param[2] = (unsigned long)info; 00053 param[3] = (unsigned long)sizeof(XFINFO); 00054 00055 return __semihost(USR_XFFIND, param); 00056 } 00057 00058 #define OPEN_R 0 00059 #define OPEN_B 1 00060 #define OPEN_PLUS 2 00061 #define OPEN_W 4 00062 #define OPEN_A 8 00063 #define OPEN_INVALID -1 00064 00065 int posix_to_semihost_open_flags(int flags) { 00066 /* POSIX flags -> semihosting open mode */ 00067 int openmode; 00068 if (flags & O_RDWR) { 00069 /* a plus mode */ 00070 openmode = OPEN_PLUS; 00071 if (flags & O_APPEND) { 00072 openmode |= OPEN_A; 00073 } else if (flags & O_TRUNC) { 00074 openmode |= OPEN_W; 00075 } else { 00076 openmode |= OPEN_R; 00077 } 00078 } else if (flags & O_WRONLY) { 00079 /* write or append */ 00080 if (flags & O_APPEND) { 00081 openmode = OPEN_A; 00082 } else { 00083 openmode = OPEN_W; 00084 } 00085 } else if (flags == O_RDONLY) { 00086 /* read mode */ 00087 openmode = OPEN_R; 00088 } else { 00089 /* invalid flags */ 00090 openmode = OPEN_INVALID; 00091 } 00092 00093 return openmode; 00094 } 00095 00096 FILEHANDLE local_file_open(const char* name, int flags) { 00097 int openmode = posix_to_semihost_open_flags(flags); 00098 if (openmode == OPEN_INVALID) { 00099 return (FILEHANDLE)NULL; 00100 } 00101 00102 FILEHANDLE fh = semihost_open(name, openmode); 00103 if (fh == -1) { 00104 return (FILEHANDLE)NULL; 00105 } 00106 00107 return fh; 00108 } 00109 00110 LocalFileHandle::LocalFileHandle(FILEHANDLE fh) : _fh(fh), pos(0) { 00111 // No lock needed in constructor 00112 } 00113 00114 int LocalFileHandle::close() { 00115 int retval = semihost_close(_fh); 00116 delete this; 00117 return retval; 00118 } 00119 00120 ssize_t LocalFileHandle::write(const void *buffer, size_t length) { 00121 lock(); 00122 ssize_t n = semihost_write(_fh, (const unsigned char*)buffer, length, 0); // number of characters not written 00123 n = length - n; // number of characters written 00124 pos += n; 00125 unlock(); 00126 return n; 00127 } 00128 00129 ssize_t LocalFileHandle::read(void *buffer, size_t length) { 00130 lock(); 00131 ssize_t n = semihost_read(_fh, (unsigned char*)buffer, length, 0); // number of characters not read 00132 n = length - n; // number of characters read 00133 pos += n; 00134 unlock(); 00135 return n; 00136 } 00137 00138 int LocalFileHandle::isatty() { 00139 lock(); 00140 int ret = semihost_istty(_fh); 00141 unlock(); 00142 return ret; 00143 } 00144 00145 off_t LocalFileHandle::lseek(off_t position, int whence) { 00146 lock(); 00147 if (whence == SEEK_CUR) { 00148 position += pos; 00149 } else if (whence == SEEK_END) { 00150 position += semihost_flen(_fh); 00151 } /* otherwise SEEK_SET, so position is fine */ 00152 00153 /* Always seems to return -1, so just ignore for now. */ 00154 semihost_seek(_fh, position); 00155 pos = position; 00156 unlock(); 00157 return position; 00158 } 00159 00160 int LocalFileHandle::fsync() { 00161 lock(); 00162 int ret = semihost_ensure(_fh); 00163 unlock(); 00164 return ret; 00165 } 00166 00167 off_t LocalFileHandle::flen() { 00168 lock(); 00169 off_t off = semihost_flen(_fh); 00170 unlock(); 00171 return off; 00172 } 00173 00174 void LocalFileHandle::lock() { 00175 _mutex.lock(); 00176 } 00177 00178 void LocalFileHandle::unlock() { 00179 _mutex.unlock(); 00180 } 00181 00182 class LocalDirHandle : public DirHandle { 00183 00184 public: 00185 struct dirent cur_entry; 00186 XFINFO info; 00187 00188 LocalDirHandle() : cur_entry(), info() { 00189 } 00190 00191 virtual int closedir() { 00192 // No lock can be used in destructor 00193 delete this; 00194 return 0; 00195 } 00196 00197 virtual struct dirent *readdir() { 00198 lock(); 00199 if (xffind("*", &info)!=0) { 00200 unlock(); 00201 return NULL; 00202 } 00203 memcpy(cur_entry.d_name, info.name, sizeof(info.name)); 00204 unlock(); 00205 return &cur_entry; 00206 } 00207 00208 virtual void rewinddir() { 00209 lock(); 00210 info.fileID = 0; 00211 unlock(); 00212 } 00213 00214 virtual off_t telldir() { 00215 lock(); 00216 int fileId = info.fileID; 00217 unlock(); 00218 return fileId; 00219 } 00220 00221 virtual void seekdir(off_t offset) { 00222 lock(); 00223 info.fileID = offset; 00224 unlock(); 00225 } 00226 00227 protected: 00228 PlatformMutex _mutex; 00229 00230 virtual void lock() { 00231 _mutex.lock(); 00232 } 00233 00234 virtual void unlock() { 00235 _mutex.unlock(); 00236 } 00237 }; 00238 00239 FileHandle *LocalFileSystem::open(const char* name, int flags) { 00240 // No global state modified so function is thread safe 00241 00242 /* reject filenames with / in them */ 00243 for (const char *tmp = name; *tmp; tmp++) { 00244 if (*tmp == '/') { 00245 return NULL; 00246 } 00247 } 00248 00249 int openmode = posix_to_semihost_open_flags(flags); 00250 if (openmode == OPEN_INVALID) { 00251 return NULL; 00252 } 00253 00254 FILEHANDLE fh = semihost_open(name, openmode); 00255 if (fh == -1) { 00256 return NULL; 00257 } 00258 return new LocalFileHandle(fh); 00259 } 00260 00261 int LocalFileSystem::remove(const char *filename) { 00262 // No global state modified so function is thread safe 00263 00264 return semihost_remove(filename); 00265 } 00266 00267 DirHandle *LocalFileSystem::opendir(const char *name) { 00268 // No global state modified so function is thread safe 00269 00270 return new LocalDirHandle(); 00271 } 00272 00273 } // namespace mbed 00274 00275 #endif
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