this library has few changes from the original library, for effects of this work.

Dependents:   OBC3_1_h

Committer:
FannyCalle
Date:
Mon May 21 15:10:37 2018 +0000
Revision:
0:8214896432e0
el sd hay que revisar;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
FannyCalle 0:8214896432e0 1 /* mbed Microcontroller Library - MemFileSystem
FannyCalle 0:8214896432e0 2 * Copyright (c) 2008, sford
FannyCalle 0:8214896432e0 3 */
FannyCalle 0:8214896432e0 4
FannyCalle 0:8214896432e0 5
FannyCalle 0:8214896432e0 6 #ifndef MBED_MEMFILESYSTEM_H
FannyCalle 0:8214896432e0 7 #define MBED_MEMFILESYSTEM_H
FannyCalle 0:8214896432e0 8
FannyCalle 0:8214896432e0 9 #include "FATFileSystem.h"
FannyCalle 0:8214896432e0 10
FannyCalle 0:8214896432e0 11 namespace mbed
FannyCalle 0:8214896432e0 12 {
FannyCalle 0:8214896432e0 13
FannyCalle 0:8214896432e0 14 class MemFileSystem : public FATFileSystem
FannyCalle 0:8214896432e0 15 {
FannyCalle 0:8214896432e0 16 public:
FannyCalle 0:8214896432e0 17
FannyCalle 0:8214896432e0 18 // 2000 sectors, each 512 bytes (malloced as required)
FannyCalle 0:8214896432e0 19 char *sectors[2000];
FannyCalle 0:8214896432e0 20
FannyCalle 0:8214896432e0 21 MemFileSystem(const char* name) : FATFileSystem(name) {
FannyCalle 0:8214896432e0 22 memset(sectors, 0, sizeof(sectors));
FannyCalle 0:8214896432e0 23 }
FannyCalle 0:8214896432e0 24
FannyCalle 0:8214896432e0 25 virtual ~MemFileSystem() {
FannyCalle 0:8214896432e0 26 for(int i = 0; i < 2000; i++) {
FannyCalle 0:8214896432e0 27 if(sectors[i]) {
FannyCalle 0:8214896432e0 28 free(sectors[i]);
FannyCalle 0:8214896432e0 29 }
FannyCalle 0:8214896432e0 30 }
FannyCalle 0:8214896432e0 31 }
FannyCalle 0:8214896432e0 32
FannyCalle 0:8214896432e0 33 // read a sector in to the buffer, return 0 if ok
FannyCalle 0:8214896432e0 34 virtual int disk_read(char *buffer, int sector) {
FannyCalle 0:8214896432e0 35 if(sectors[sector] == 0) {
FannyCalle 0:8214896432e0 36 // nothing allocated means sector is empty
FannyCalle 0:8214896432e0 37 memset(buffer, 0, 512);
FannyCalle 0:8214896432e0 38 } else {
FannyCalle 0:8214896432e0 39 memcpy(buffer, sectors[sector], 512);
FannyCalle 0:8214896432e0 40 }
FannyCalle 0:8214896432e0 41 return 0;
FannyCalle 0:8214896432e0 42 }
FannyCalle 0:8214896432e0 43
FannyCalle 0:8214896432e0 44 // write a sector from the buffer, return 0 if ok
FannyCalle 0:8214896432e0 45 virtual int disk_write(const char *buffer, int sector) {
FannyCalle 0:8214896432e0 46 // if buffer is zero deallocate sector
FannyCalle 0:8214896432e0 47 char zero[512];
FannyCalle 0:8214896432e0 48 memset(zero, 0, 512);
FannyCalle 0:8214896432e0 49 if(memcmp(zero, buffer, 512)==0) {
FannyCalle 0:8214896432e0 50 if(sectors[sector] != 0) {
FannyCalle 0:8214896432e0 51 free(sectors[sector]);
FannyCalle 0:8214896432e0 52 sectors[sector] = 0;
FannyCalle 0:8214896432e0 53 }
FannyCalle 0:8214896432e0 54 return 0;
FannyCalle 0:8214896432e0 55 }
FannyCalle 0:8214896432e0 56 // else allocate a sector if needed, and write
FannyCalle 0:8214896432e0 57 if(sectors[sector] == 0) {
FannyCalle 0:8214896432e0 58 char *sec = (char*)malloc(512);
FannyCalle 0:8214896432e0 59 if(sec==0) {
FannyCalle 0:8214896432e0 60 return 1; // out of memory
FannyCalle 0:8214896432e0 61 }
FannyCalle 0:8214896432e0 62 sectors[sector] = sec;
FannyCalle 0:8214896432e0 63 }
FannyCalle 0:8214896432e0 64 memcpy(sectors[sector], buffer, 512);
FannyCalle 0:8214896432e0 65 return 0;
FannyCalle 0:8214896432e0 66 }
FannyCalle 0:8214896432e0 67
FannyCalle 0:8214896432e0 68 // return the number of sectors
FannyCalle 0:8214896432e0 69 virtual int disk_sectors() {
FannyCalle 0:8214896432e0 70 return sizeof(sectors)/sizeof(sectors[0]);
FannyCalle 0:8214896432e0 71 }
FannyCalle 0:8214896432e0 72
FannyCalle 0:8214896432e0 73 };
FannyCalle 0:8214896432e0 74
FannyCalle 0:8214896432e0 75 }
FannyCalle 0:8214896432e0 76
FannyCalle 0:8214896432e0 77 #endif