Kazuki Yamamoto / USBFileSystem

[ FORK ] USBFileSytem; fork from sissors/USBFileSystem

Dependents:   USBMSD_CDC_11U35test

Fork of USBFileSystem by Erik -

FATFileSystem/MemFileSystem.h@9:98a97b7d56a8, 2015-04-21 (annotated)

Committer:
k4zuki
Date:
Tue Apr 21 09:14:07 2015 +0000
Revision:
9:98a97b7d56a8
Parent:
6:15b73dae124e 
update USBDevice

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Sissors 6:15b73dae124e 1 /* mbed Microcontroller Library - MemFileSystem
Sissors 6:15b73dae124e 2 * Copyright (c) 2008, sford
Sissors 6:15b73dae124e 3 */
Sissors 6:15b73dae124e 4
Sissors 6:15b73dae124e 5
Sissors 6:15b73dae124e 6 #ifndef MBED_MEMFILESYSTEM_H
Sissors 6:15b73dae124e 7 #define MBED_MEMFILESYSTEM_H
Sissors 6:15b73dae124e 8
Sissors 6:15b73dae124e 9 #include "FATFileSystem.h"
Sissors 6:15b73dae124e 10
Sissors 6:15b73dae124e 11 namespace mbed
Sissors 6:15b73dae124e 12 {
Sissors 6:15b73dae124e 13
Sissors 6:15b73dae124e 14 class MemFileSystem : public FATFileSystem
Sissors 6:15b73dae124e 15 {
Sissors 6:15b73dae124e 16 public:
Sissors 6:15b73dae124e 17
Sissors 6:15b73dae124e 18 // 2000 sectors, each 512 bytes (malloced as required)
Sissors 6:15b73dae124e 19 char *sectors[2000];
Sissors 6:15b73dae124e 20
Sissors 6:15b73dae124e 21 MemFileSystem(const char* name) : FATFileSystem(name) {
Sissors 6:15b73dae124e 22 memset(sectors, 0, sizeof(sectors));
Sissors 6:15b73dae124e 23 }
Sissors 6:15b73dae124e 24
Sissors 6:15b73dae124e 25 virtual ~MemFileSystem() {
Sissors 6:15b73dae124e 26 for(int i = 0; i < 2000; i++) {
Sissors 6:15b73dae124e 27 if(sectors[i]) {
Sissors 6:15b73dae124e 28 free(sectors[i]);
Sissors 6:15b73dae124e 29 }
Sissors 6:15b73dae124e 30 }
Sissors 6:15b73dae124e 31 }
Sissors 6:15b73dae124e 32
Sissors 6:15b73dae124e 33 // read a sector in to the buffer, return 0 if ok
Sissors 6:15b73dae124e 34 virtual int disk_read(char *buffer, int sector) {
Sissors 6:15b73dae124e 35 if(sectors[sector] == 0) {
Sissors 6:15b73dae124e 36 // nothing allocated means sector is empty
Sissors 6:15b73dae124e 37 memset(buffer, 0, 512);
Sissors 6:15b73dae124e 38 } else {
Sissors 6:15b73dae124e 39 memcpy(buffer, sectors[sector], 512);
Sissors 6:15b73dae124e 40 }
Sissors 6:15b73dae124e 41 return 0;
Sissors 6:15b73dae124e 42 }
Sissors 6:15b73dae124e 43
Sissors 6:15b73dae124e 44 // write a sector from the buffer, return 0 if ok
Sissors 6:15b73dae124e 45 virtual int disk_write(const char *buffer, int sector) {
Sissors 6:15b73dae124e 46 // if buffer is zero deallocate sector
Sissors 6:15b73dae124e 47 char zero[512];
Sissors 6:15b73dae124e 48 memset(zero, 0, 512);
Sissors 6:15b73dae124e 49 if(memcmp(zero, buffer, 512)==0) {
Sissors 6:15b73dae124e 50 if(sectors[sector] != 0) {
Sissors 6:15b73dae124e 51 free(sectors[sector]);
Sissors 6:15b73dae124e 52 sectors[sector] = 0;
Sissors 6:15b73dae124e 53 }
Sissors 6:15b73dae124e 54 return 0;
Sissors 6:15b73dae124e 55 }
Sissors 6:15b73dae124e 56 // else allocate a sector if needed, and write
Sissors 6:15b73dae124e 57 if(sectors[sector] == 0) {
Sissors 6:15b73dae124e 58 char *sec = (char*)malloc(512);
Sissors 6:15b73dae124e 59 if(sec==0) {
Sissors 6:15b73dae124e 60 return 1; // out of memory
Sissors 6:15b73dae124e 61 }
Sissors 6:15b73dae124e 62 sectors[sector] = sec;
Sissors 6:15b73dae124e 63 }
Sissors 6:15b73dae124e 64 memcpy(sectors[sector], buffer, 512);
Sissors 6:15b73dae124e 65 return 0;
Sissors 6:15b73dae124e 66 }
Sissors 6:15b73dae124e 67
Sissors 6:15b73dae124e 68 // return the number of sectors
Sissors 6:15b73dae124e 69 virtual int disk_sectors() {
Sissors 6:15b73dae124e 70 return sizeof(sectors)/sizeof(sectors[0]);
Sissors 6:15b73dae124e 71 }
Sissors 6:15b73dae124e 72
Sissors 6:15b73dae124e 73 };
Sissors 6:15b73dae124e 74
Sissors 6:15b73dae124e 75 }
Sissors 6:15b73dae124e 76
Sissors 6:15b73dae124e 77 #endif