FATFileHandle.cpp

00001 /* mbed Microcontroller Library - FATFileHandle
00002    Copyright (c) 2008, sford */
00003 
00004 //Modified by Thomas Hamilton, Copyright 2010
00005 
00006 #include "FATFileHandle.h"
00007 
00008 FATFileHandle::FATFileHandle(FAT_FIL InputFilStr)
00009 {
00010     FileObject = InputFilStr;
00011 }
00012 
00013 ssize_t FATFileHandle::write(const void* buffer, size_t length)
00014 {
00015     UINT ByteWritten;
00016     if (f_write(&FileObject, buffer, (UINT)length, &ByteWritten))
00017     { 
00018         return -1;
00019     }
00020     else
00021     {
00022         return (ssize_t)ByteWritten;
00023     }
00024 }
00025 
00026 int FATFileHandle::close()
00027 {
00028     if (f_close(&FileObject))
00029     {
00030         return -1;
00031     }
00032     else
00033     {
00034         delete this;
00035         return 0;
00036     }
00037 }
00038 
00039 ssize_t FATFileHandle::read(void* buffer, size_t length)
00040 {
00041     UINT ByteRead;
00042     if (f_read(&FileObject, buffer, (UINT)length, &ByteRead))
00043     {
00044         return -1;
00045     }
00046     else
00047     {
00048         return (ssize_t)ByteRead;
00049     }
00050 }
00051 
00052 int FATFileHandle::isatty()
00053 {
00054     return 0;
00055 }
00056 
00057 off_t FATFileHandle::lseek(off_t offset, int whence)
00058 {
00059     switch (whence)
00060     {
00061         case SEEK_CUR: offset += FileObject.fptr; break;
00062         case SEEK_END: offset += FileObject.fsize; break;
00063     }
00064     if (f_lseek(&FileObject, (DWORD)offset))
00065     {
00066         return -1;
00067     }
00068     else
00069     {
00070         return (off_t)FileObject.fptr;
00071     }
00072 }
00073 
00074 int FATFileHandle::fsync()
00075 {
00076     if (f_sync(&FileObject))
00077     {
00078         return -1;
00079     }
00080     else
00081     {
00082         return 0;
00083     }
00084 }
00085 
00086 off_t FATFileHandle::flen()
00087 {
00088     return (off_t)FileObject.fsize;
00089 }