src/libs/ChaNFS/FATFileHandle.cpp

   1 /* mbed Microcontroller Library - FATFileHandle
   2  * Copyright (c) 2008, sford
   3  */
   4
   5 #include "FATFileHandle.h"
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include "ff.h"
  10 #include "FATFileSystem.h"
  11
  12 namespace mbed {
  13
  14 #if FFSDEBUG_ENABLED
  15 static const char *FR_ERRORS[] = {
  16     "FR_OK = 0",
  17     "FR_NOT_READY",
  18     "FR_NO_FILE",
  19     "FR_NO_PATH",
  20     "FR_INVALID_NAME",
  21     "FR_INVALID_DRIVE",
  22     "FR_DENIED",
  23     "FR_EXIST",
  24     "FR_RW_ERROR",
  25     "FR_WRITE_PROTECTED",
  26     "FR_NOT_ENABLED",
  27     "FR_NO_FILESYSTEM",
  28     "FR_INVALID_OBJECT",
  29     "FR_MKFS_ABORTED"
  30 };
  31 #endif
  32
  33 FATFileHandle::FATFileHandle(FIL_t fh) {
  34     _fh = fh;
  35 }
  36
  37 int FATFileHandle::close() {
  38     FFSDEBUG("close\n");
  39     int retval = f_close(&_fh);
  40     delete this;
  41     return retval;
  42 }
  43
  44 ssize_t FATFileHandle::write(const void* buffer, size_t length) {
  45     FFSDEBUG("write(%d)\n", length);
  46     UINT n;
  47     FRESULT res = f_write(&_fh, buffer, length, &n);
  48     if(res) {
  49         FFSDEBUG("f_write() failed (%d, %s)", res, FR_ERRORS[res]);
  50         return -1;
  51     }
  52     return n;
  53 }
  54
  55 ssize_t FATFileHandle::read(void* buffer, size_t length) {
  56     FFSDEBUG("read(%d)\n", length);
  57     UINT n;
  58     FRESULT res = f_read(&_fh, buffer, length, &n);
  59     if(res) {
  60         FFSDEBUG("f_read() failed (%d, %s)\n", res, FR_ERRORS[res]);
  61         return -1;
  62     }
  63     return n;
  64 }
  65
  66 int FATFileHandle::isatty() {
  67     return 0;
  68 }
  69
  70 off_t FATFileHandle::lseek(off_t position, int whence) {
  71     FFSDEBUG("lseek(%i,%i)\n",position,whence);
  72     if(whence == SEEK_END) {
  73         position += _fh.fsize;
  74     } else if(whence==SEEK_CUR) {
  75         position += _fh.fptr;
  76     }
  77     FRESULT res = f_lseek(&_fh, position);
  78     if(res) {
  79         FFSDEBUG("lseek failed (%d, %s)\n", res, FR_ERRORS[res]);
  80         return -1;
  81     } else {
  82         FFSDEBUG("lseek OK, returning %i\n", _fh.fptr);
  83         return _fh.fptr;
  84     }
  85 }
  86
  87 int FATFileHandle::fsync() {
  88     FFSDEBUG("fsync()\n");
  89     FRESULT res = f_sync(&_fh);
  90     if (res) {
  91         FFSDEBUG("f_sync() failed (%d, %s)\n", res, FR_ERRORS[res]);
  92         return -1;
  93     }
  94     return 0;
  95 }
  96
  97 off_t FATFileHandle::flen() {
  98     FFSDEBUG("flen\n");
  99     return _fh.fsize;
 100 }
 101
 102 } // namespace mbed