PHung Tung / SRC_STM32F7

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common/LocalFileSystem.cpp@0:e87aa4c49e95, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:51:46 2019 +0000
Revision:
0:e87aa4c49e95
libray

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phungductung 0:e87aa4c49e95 1 /* mbed Microcontroller Library
phungductung 0:e87aa4c49e95 2 * Copyright (c) 2006-2013 ARM Limited
phungductung 0:e87aa4c49e95 3 *
phungductung 0:e87aa4c49e95 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:e87aa4c49e95 5 * you may not use this file except in compliance with the License.
phungductung 0:e87aa4c49e95 6 * You may obtain a copy of the License at
phungductung 0:e87aa4c49e95 7 *
phungductung 0:e87aa4c49e95 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:e87aa4c49e95 9 *
phungductung 0:e87aa4c49e95 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:e87aa4c49e95 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:e87aa4c49e95 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:e87aa4c49e95 13 * See the License for the specific language governing permissions and
phungductung 0:e87aa4c49e95 14 * limitations under the License.
phungductung 0:e87aa4c49e95 15 */
phungductung 0:e87aa4c49e95 16 #include "LocalFileSystem.h"
phungductung 0:e87aa4c49e95 17
phungductung 0:e87aa4c49e95 18 #if DEVICE_LOCALFILESYSTEM
phungductung 0:e87aa4c49e95 19
phungductung 0:e87aa4c49e95 20 #include "semihost_api.h"
phungductung 0:e87aa4c49e95 21 #include <string.h>
phungductung 0:e87aa4c49e95 22 #include <stdio.h>
phungductung 0:e87aa4c49e95 23
phungductung 0:e87aa4c49e95 24 namespace mbed {
phungductung 0:e87aa4c49e95 25
phungductung 0:e87aa4c49e95 26 /* Extension to FINFO type defined in RTL.h (in Keil RL) - adds 'create time'. */
phungductung 0:e87aa4c49e95 27 typedef struct {
phungductung 0:e87aa4c49e95 28 unsigned char hr; /* Hours [0..23] */
phungductung 0:e87aa4c49e95 29 unsigned char min; /* Minutes [0..59] */
phungductung 0:e87aa4c49e95 30 unsigned char sec; /* Seconds [0..59] */
phungductung 0:e87aa4c49e95 31 unsigned char day; /* Day [1..31] */
phungductung 0:e87aa4c49e95 32 unsigned char mon; /* Month [1..12] */
phungductung 0:e87aa4c49e95 33 unsigned short year; /* Year [1980..2107] */
phungductung 0:e87aa4c49e95 34 } FTIME;
phungductung 0:e87aa4c49e95 35
phungductung 0:e87aa4c49e95 36 typedef struct { /* File Search info record */
phungductung 0:e87aa4c49e95 37 char name[32]; /* File name */
phungductung 0:e87aa4c49e95 38 long size; /* File size in bytes */
phungductung 0:e87aa4c49e95 39 int fileID; /* System File Identification */
phungductung 0:e87aa4c49e95 40 FTIME create_time; /* Date & time file was created */
phungductung 0:e87aa4c49e95 41 FTIME write_time; /* Date & time of last write */
phungductung 0:e87aa4c49e95 42 } XFINFO;
phungductung 0:e87aa4c49e95 43
phungductung 0:e87aa4c49e95 44 #define RESERVED_FOR_USER_APPLICATIONS (0x100) /* 0x100 - 0x1ff */
phungductung 0:e87aa4c49e95 45 #define USR_XFFIND (RESERVED_FOR_USER_APPLICATIONS + 0)
phungductung 0:e87aa4c49e95 46
phungductung 0:e87aa4c49e95 47 static int xffind (const char *pattern, XFINFO *info) {
phungductung 0:e87aa4c49e95 48 unsigned param[4];
phungductung 0:e87aa4c49e95 49
phungductung 0:e87aa4c49e95 50 param[0] = (unsigned long)pattern;
phungductung 0:e87aa4c49e95 51 param[1] = (unsigned long)strlen(pattern);
phungductung 0:e87aa4c49e95 52 param[2] = (unsigned long)info;
phungductung 0:e87aa4c49e95 53 param[3] = (unsigned long)sizeof(XFINFO);
phungductung 0:e87aa4c49e95 54
phungductung 0:e87aa4c49e95 55 return __semihost(USR_XFFIND, param);
phungductung 0:e87aa4c49e95 56 }
phungductung 0:e87aa4c49e95 57
phungductung 0:e87aa4c49e95 58 #define OPEN_R 0
phungductung 0:e87aa4c49e95 59 #define OPEN_B 1
phungductung 0:e87aa4c49e95 60 #define OPEN_PLUS 2
phungductung 0:e87aa4c49e95 61 #define OPEN_W 4
phungductung 0:e87aa4c49e95 62 #define OPEN_A 8
phungductung 0:e87aa4c49e95 63 #define OPEN_INVALID -1
phungductung 0:e87aa4c49e95 64
phungductung 0:e87aa4c49e95 65 int posix_to_semihost_open_flags(int flags) {
phungductung 0:e87aa4c49e95 66 /* POSIX flags -> semihosting open mode */
phungductung 0:e87aa4c49e95 67 int openmode;
phungductung 0:e87aa4c49e95 68 if (flags & O_RDWR) {
phungductung 0:e87aa4c49e95 69 /* a plus mode */
phungductung 0:e87aa4c49e95 70 openmode = OPEN_PLUS;
phungductung 0:e87aa4c49e95 71 if (flags & O_APPEND) {
phungductung 0:e87aa4c49e95 72 openmode |= OPEN_A;
phungductung 0:e87aa4c49e95 73 } else if (flags & O_TRUNC) {
phungductung 0:e87aa4c49e95 74 openmode |= OPEN_W;
phungductung 0:e87aa4c49e95 75 } else {
phungductung 0:e87aa4c49e95 76 openmode |= OPEN_R;
phungductung 0:e87aa4c49e95 77 }
phungductung 0:e87aa4c49e95 78 } else if (flags & O_WRONLY) {
phungductung 0:e87aa4c49e95 79 /* write or append */
phungductung 0:e87aa4c49e95 80 if (flags & O_APPEND) {
phungductung 0:e87aa4c49e95 81 openmode = OPEN_A;
phungductung 0:e87aa4c49e95 82 } else {
phungductung 0:e87aa4c49e95 83 openmode = OPEN_W;
phungductung 0:e87aa4c49e95 84 }
phungductung 0:e87aa4c49e95 85 } else if (flags == O_RDONLY) {
phungductung 0:e87aa4c49e95 86 /* read mode */
phungductung 0:e87aa4c49e95 87 openmode = OPEN_R;
phungductung 0:e87aa4c49e95 88 } else {
phungductung 0:e87aa4c49e95 89 /* invalid flags */
phungductung 0:e87aa4c49e95 90 openmode = OPEN_INVALID;
phungductung 0:e87aa4c49e95 91 }
phungductung 0:e87aa4c49e95 92
phungductung 0:e87aa4c49e95 93 return openmode;
phungductung 0:e87aa4c49e95 94 }
phungductung 0:e87aa4c49e95 95
phungductung 0:e87aa4c49e95 96 FILEHANDLE local_file_open(const char* name, int flags) {
phungductung 0:e87aa4c49e95 97 int openmode = posix_to_semihost_open_flags(flags);
phungductung 0:e87aa4c49e95 98 if (openmode == OPEN_INVALID) {
phungductung 0:e87aa4c49e95 99 return (FILEHANDLE)NULL;
phungductung 0:e87aa4c49e95 100 }
phungductung 0:e87aa4c49e95 101
phungductung 0:e87aa4c49e95 102 FILEHANDLE fh = semihost_open(name, openmode);
phungductung 0:e87aa4c49e95 103 if (fh == -1) {
phungductung 0:e87aa4c49e95 104 return (FILEHANDLE)NULL;
phungductung 0:e87aa4c49e95 105 }
phungductung 0:e87aa4c49e95 106
phungductung 0:e87aa4c49e95 107 return fh;
phungductung 0:e87aa4c49e95 108 }
phungductung 0:e87aa4c49e95 109
phungductung 0:e87aa4c49e95 110 LocalFileHandle::LocalFileHandle(FILEHANDLE fh) : _fh(fh), pos(0) {
phungductung 0:e87aa4c49e95 111 }
phungductung 0:e87aa4c49e95 112
phungductung 0:e87aa4c49e95 113 int LocalFileHandle::close() {
phungductung 0:e87aa4c49e95 114 int retval = semihost_close(_fh);
phungductung 0:e87aa4c49e95 115 delete this;
phungductung 0:e87aa4c49e95 116 return retval;
phungductung 0:e87aa4c49e95 117 }
phungductung 0:e87aa4c49e95 118
phungductung 0:e87aa4c49e95 119 ssize_t LocalFileHandle::write(const void *buffer, size_t length) {
phungductung 0:e87aa4c49e95 120 ssize_t n = semihost_write(_fh, (const unsigned char*)buffer, length, 0); // number of characters not written
phungductung 0:e87aa4c49e95 121 n = length - n; // number of characters written
phungductung 0:e87aa4c49e95 122 pos += n;
phungductung 0:e87aa4c49e95 123 return n;
phungductung 0:e87aa4c49e95 124 }
phungductung 0:e87aa4c49e95 125
phungductung 0:e87aa4c49e95 126 ssize_t LocalFileHandle::read(void *buffer, size_t length) {
phungductung 0:e87aa4c49e95 127 ssize_t n = semihost_read(_fh, (unsigned char*)buffer, length, 0); // number of characters not read
phungductung 0:e87aa4c49e95 128 n = length - n; // number of characters read
phungductung 0:e87aa4c49e95 129 pos += n;
phungductung 0:e87aa4c49e95 130 return n;
phungductung 0:e87aa4c49e95 131 }
phungductung 0:e87aa4c49e95 132
phungductung 0:e87aa4c49e95 133 int LocalFileHandle::isatty() {
phungductung 0:e87aa4c49e95 134 return semihost_istty(_fh);
phungductung 0:e87aa4c49e95 135 }
phungductung 0:e87aa4c49e95 136
phungductung 0:e87aa4c49e95 137 off_t LocalFileHandle::lseek(off_t position, int whence) {
phungductung 0:e87aa4c49e95 138 if (whence == SEEK_CUR) {
phungductung 0:e87aa4c49e95 139 position += pos;
phungductung 0:e87aa4c49e95 140 } else if (whence == SEEK_END) {
phungductung 0:e87aa4c49e95 141 position += semihost_flen(_fh);
phungductung 0:e87aa4c49e95 142 } /* otherwise SEEK_SET, so position is fine */
phungductung 0:e87aa4c49e95 143
phungductung 0:e87aa4c49e95 144 /* Always seems to return -1, so just ignore for now. */
phungductung 0:e87aa4c49e95 145 semihost_seek(_fh, position);
phungductung 0:e87aa4c49e95 146 pos = position;
phungductung 0:e87aa4c49e95 147 return position;
phungductung 0:e87aa4c49e95 148 }
phungductung 0:e87aa4c49e95 149
phungductung 0:e87aa4c49e95 150 int LocalFileHandle::fsync() {
phungductung 0:e87aa4c49e95 151 return semihost_ensure(_fh);
phungductung 0:e87aa4c49e95 152 }
phungductung 0:e87aa4c49e95 153
phungductung 0:e87aa4c49e95 154 off_t LocalFileHandle::flen() {
phungductung 0:e87aa4c49e95 155 return semihost_flen(_fh);
phungductung 0:e87aa4c49e95 156 }
phungductung 0:e87aa4c49e95 157
phungductung 0:e87aa4c49e95 158 class LocalDirHandle : public DirHandle {
phungductung 0:e87aa4c49e95 159
phungductung 0:e87aa4c49e95 160 public:
phungductung 0:e87aa4c49e95 161 struct dirent cur_entry;
phungductung 0:e87aa4c49e95 162 XFINFO info;
phungductung 0:e87aa4c49e95 163
phungductung 0:e87aa4c49e95 164 LocalDirHandle() : cur_entry(), info() {
phungductung 0:e87aa4c49e95 165 }
phungductung 0:e87aa4c49e95 166
phungductung 0:e87aa4c49e95 167 virtual int closedir() {
phungductung 0:e87aa4c49e95 168 delete this;
phungductung 0:e87aa4c49e95 169 return 0;
phungductung 0:e87aa4c49e95 170 }
phungductung 0:e87aa4c49e95 171
phungductung 0:e87aa4c49e95 172 virtual struct dirent *readdir() {
phungductung 0:e87aa4c49e95 173 if (xffind("*", &info)!=0) {
phungductung 0:e87aa4c49e95 174 return NULL;
phungductung 0:e87aa4c49e95 175 }
phungductung 0:e87aa4c49e95 176 memcpy(cur_entry.d_name, info.name, sizeof(info.name));
phungductung 0:e87aa4c49e95 177 return &cur_entry;
phungductung 0:e87aa4c49e95 178 }
phungductung 0:e87aa4c49e95 179
phungductung 0:e87aa4c49e95 180 virtual void rewinddir() {
phungductung 0:e87aa4c49e95 181 info.fileID = 0;
phungductung 0:e87aa4c49e95 182 }
phungductung 0:e87aa4c49e95 183
phungductung 0:e87aa4c49e95 184 virtual off_t telldir() {
phungductung 0:e87aa4c49e95 185 return info.fileID;
phungductung 0:e87aa4c49e95 186 }
phungductung 0:e87aa4c49e95 187
phungductung 0:e87aa4c49e95 188 virtual void seekdir(off_t offset) {
phungductung 0:e87aa4c49e95 189 info.fileID = offset;
phungductung 0:e87aa4c49e95 190 }
phungductung 0:e87aa4c49e95 191 };
phungductung 0:e87aa4c49e95 192
phungductung 0:e87aa4c49e95 193 FileHandle *LocalFileSystem::open(const char* name, int flags) {
phungductung 0:e87aa4c49e95 194 /* reject filenames with / in them */
phungductung 0:e87aa4c49e95 195 for (const char *tmp = name; *tmp; tmp++) {
phungductung 0:e87aa4c49e95 196 if (*tmp == '/') {
phungductung 0:e87aa4c49e95 197 return NULL;
phungductung 0:e87aa4c49e95 198 }
phungductung 0:e87aa4c49e95 199 }
phungductung 0:e87aa4c49e95 200
phungductung 0:e87aa4c49e95 201 int openmode = posix_to_semihost_open_flags(flags);
phungductung 0:e87aa4c49e95 202 if (openmode == OPEN_INVALID) {
phungductung 0:e87aa4c49e95 203 return NULL;
phungductung 0:e87aa4c49e95 204 }
phungductung 0:e87aa4c49e95 205
phungductung 0:e87aa4c49e95 206 FILEHANDLE fh = semihost_open(name, openmode);
phungductung 0:e87aa4c49e95 207 if (fh == -1) {
phungductung 0:e87aa4c49e95 208 return NULL;
phungductung 0:e87aa4c49e95 209 }
phungductung 0:e87aa4c49e95 210 return new LocalFileHandle(fh);
phungductung 0:e87aa4c49e95 211 }
phungductung 0:e87aa4c49e95 212
phungductung 0:e87aa4c49e95 213 int LocalFileSystem::remove(const char *filename) {
phungductung 0:e87aa4c49e95 214 return semihost_remove(filename);
phungductung 0:e87aa4c49e95 215 }
phungductung 0:e87aa4c49e95 216
phungductung 0:e87aa4c49e95 217 DirHandle *LocalFileSystem::opendir(const char *name) {
phungductung 0:e87aa4c49e95 218 return new LocalDirHandle();
phungductung 0:e87aa4c49e95 219 }
phungductung 0:e87aa4c49e95 220
phungductung 0:e87aa4c49e95 221 } // namespace mbed
phungductung 0:e87aa4c49e95 222
phungductung 0:e87aa4c49e95 223 #endif