Shinichiro Nakamura / FatFileSystem

Local copy of the FatFileSystem.

Dependents:   SimpleWaveRecorderPlayer y_CameraC1098_ES_01 _test_SDHCFileSystem Application-SimpleWaveRecorderPlayerGenerator ... more

MemFileSystem.h@0:8c55801ce311, 2012-04-14 (annotated)

Committer:
shintamainjp
Date:
Sat Apr 14 02:24:08 2012 +0000
Revision:
0:8c55801ce311
Initial version.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shintamainjp 0:8c55801ce311 1 /* mbed Microcontroller Library - MemFileSystem
shintamainjp 0:8c55801ce311 2 * Copyright (c) 2008, sford
shintamainjp 0:8c55801ce311 3 */
shintamainjp 0:8c55801ce311 4
shintamainjp 0:8c55801ce311 5
shintamainjp 0:8c55801ce311 6 #ifndef MBED_MEMFILESYSTEM_H
shintamainjp 0:8c55801ce311 7 #define MBED_MEMFILESYSTEM_H
shintamainjp 0:8c55801ce311 8
shintamainjp 0:8c55801ce311 9 #include "FATFileSystem.h"
shintamainjp 0:8c55801ce311 10
shintamainjp 0:8c55801ce311 11 namespace mbed {
shintamainjp 0:8c55801ce311 12
shintamainjp 0:8c55801ce311 13 class MemFileSystem : public FATFileSystem {
shintamainjp 0:8c55801ce311 14 public:
shintamainjp 0:8c55801ce311 15
shintamainjp 0:8c55801ce311 16 // 2000 sectors, each 512 bytes (malloced as required)
shintamainjp 0:8c55801ce311 17 char *sectors[2000];
shintamainjp 0:8c55801ce311 18
shintamainjp 0:8c55801ce311 19 MemFileSystem(const char* name) : FATFileSystem(name) {
shintamainjp 0:8c55801ce311 20 memset(sectors, 0, sizeof(sectors));
shintamainjp 0:8c55801ce311 21 }
shintamainjp 0:8c55801ce311 22
shintamainjp 0:8c55801ce311 23 virtual ~MemFileSystem() {
shintamainjp 0:8c55801ce311 24 for(int i = 0; i < 2000; i++) {
shintamainjp 0:8c55801ce311 25 if(sectors[i]) {
shintamainjp 0:8c55801ce311 26 free(sectors[i]);
shintamainjp 0:8c55801ce311 27 }
shintamainjp 0:8c55801ce311 28 }
shintamainjp 0:8c55801ce311 29 }
shintamainjp 0:8c55801ce311 30
shintamainjp 0:8c55801ce311 31 // read a sector in to the buffer, return 0 if ok
shintamainjp 0:8c55801ce311 32 virtual int disk_read(char *buffer, int sector) {
shintamainjp 0:8c55801ce311 33 if(sectors[sector] == 0) {
shintamainjp 0:8c55801ce311 34 // nothing allocated means sector is empty
shintamainjp 0:8c55801ce311 35 memset(buffer, 0, 512);
shintamainjp 0:8c55801ce311 36 } else {
shintamainjp 0:8c55801ce311 37 memcpy(buffer, sectors[sector], 512);
shintamainjp 0:8c55801ce311 38 }
shintamainjp 0:8c55801ce311 39 return 0;
shintamainjp 0:8c55801ce311 40 }
shintamainjp 0:8c55801ce311 41
shintamainjp 0:8c55801ce311 42 // write a sector from the buffer, return 0 if ok
shintamainjp 0:8c55801ce311 43 virtual int disk_write(const char *buffer, int sector) {
shintamainjp 0:8c55801ce311 44 // if buffer is zero deallocate sector
shintamainjp 0:8c55801ce311 45 char zero[512];
shintamainjp 0:8c55801ce311 46 memset(zero, 0, 512);
shintamainjp 0:8c55801ce311 47 if(memcmp(zero, buffer, 512)==0) {
shintamainjp 0:8c55801ce311 48 if(sectors[sector] != 0) {
shintamainjp 0:8c55801ce311 49 free(sectors[sector]);
shintamainjp 0:8c55801ce311 50 sectors[sector] = 0;
shintamainjp 0:8c55801ce311 51 }
shintamainjp 0:8c55801ce311 52 return 0;
shintamainjp 0:8c55801ce311 53 }
shintamainjp 0:8c55801ce311 54 // else allocate a sector if needed, and write
shintamainjp 0:8c55801ce311 55 if(sectors[sector] == 0) {
shintamainjp 0:8c55801ce311 56 char *sec = (char*)malloc(512);
shintamainjp 0:8c55801ce311 57 if(sec==0) {
shintamainjp 0:8c55801ce311 58 return 1; // out of memory
shintamainjp 0:8c55801ce311 59 }
shintamainjp 0:8c55801ce311 60 sectors[sector] = sec;
shintamainjp 0:8c55801ce311 61 }
shintamainjp 0:8c55801ce311 62 memcpy(sectors[sector], buffer, 512);
shintamainjp 0:8c55801ce311 63 return 0;
shintamainjp 0:8c55801ce311 64 }
shintamainjp 0:8c55801ce311 65
shintamainjp 0:8c55801ce311 66 // return the number of sectors
shintamainjp 0:8c55801ce311 67 virtual int disk_sectors() {
shintamainjp 0:8c55801ce311 68 return sizeof(sectors)/sizeof(sectors[0]);
shintamainjp 0:8c55801ce311 69 }
shintamainjp 0:8c55801ce311 70
shintamainjp 0:8c55801ce311 71 };
shintamainjp 0:8c55801ce311 72
shintamainjp 0:8c55801ce311 73 }
shintamainjp 0:8c55801ce311 74
shintamainjp 0:8c55801ce311 75 #endif