blue craft / FATFileSystem

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Fork of FATFileSystem by Chaiyaporn Boonyasathian

MemFileSystem.h@1:6fa3f673d44c, 2016-12-06 (annotated)

Committer:
583405000008
Date:
Tue Dec 06 07:22:42 2016 +0000
Revision:
1:6fa3f673d44c
Parent:
0:9296bb2a98a8 
d;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cha45689 0:9296bb2a98a8 1 /* mbed Microcontroller Library - MemFileSystem
cha45689 0:9296bb2a98a8 2 * Copyright (c) 2008, sford
cha45689 0:9296bb2a98a8 3 */
cha45689 0:9296bb2a98a8 4
cha45689 0:9296bb2a98a8 5
cha45689 0:9296bb2a98a8 6 #ifndef MBED_MEMFILESYSTEM_H
cha45689 0:9296bb2a98a8 7 #define MBED_MEMFILESYSTEM_H
cha45689 0:9296bb2a98a8 8
cha45689 0:9296bb2a98a8 9 #include "FATFileSystem.h"
cha45689 0:9296bb2a98a8 10
cha45689 0:9296bb2a98a8 11 namespace mbed
cha45689 0:9296bb2a98a8 12 {
cha45689 0:9296bb2a98a8 13
cha45689 0:9296bb2a98a8 14 class MemFileSystem : public FATFileSystem
cha45689 0:9296bb2a98a8 15 {
cha45689 0:9296bb2a98a8 16 public:
cha45689 0:9296bb2a98a8 17
cha45689 0:9296bb2a98a8 18 // 2000 sectors, each 512 bytes (malloced as required)
cha45689 0:9296bb2a98a8 19 char *sectors[2000];
cha45689 0:9296bb2a98a8 20
cha45689 0:9296bb2a98a8 21 MemFileSystem(const char* name) : FATFileSystem(name) {
cha45689 0:9296bb2a98a8 22 memset(sectors, 0, sizeof(sectors));
cha45689 0:9296bb2a98a8 23 }
cha45689 0:9296bb2a98a8 24
cha45689 0:9296bb2a98a8 25 virtual ~MemFileSystem() {
cha45689 0:9296bb2a98a8 26 for(int i = 0; i < 2000; i++) {
cha45689 0:9296bb2a98a8 27 if(sectors[i]) {
cha45689 0:9296bb2a98a8 28 free(sectors[i]);
cha45689 0:9296bb2a98a8 29 }
cha45689 0:9296bb2a98a8 30 }
cha45689 0:9296bb2a98a8 31 }
cha45689 0:9296bb2a98a8 32
cha45689 0:9296bb2a98a8 33 // read a sector in to the buffer, return 0 if ok
cha45689 0:9296bb2a98a8 34 virtual int disk_read(char *buffer, int sector) {
cha45689 0:9296bb2a98a8 35 if(sectors[sector] == 0) {
cha45689 0:9296bb2a98a8 36 // nothing allocated means sector is empty
cha45689 0:9296bb2a98a8 37 memset(buffer, 0, 512);
cha45689 0:9296bb2a98a8 38 } else {
cha45689 0:9296bb2a98a8 39 memcpy(buffer, sectors[sector], 512);
cha45689 0:9296bb2a98a8 40 }
cha45689 0:9296bb2a98a8 41 return 0;
cha45689 0:9296bb2a98a8 42 }
cha45689 0:9296bb2a98a8 43
cha45689 0:9296bb2a98a8 44 // write a sector from the buffer, return 0 if ok
cha45689 0:9296bb2a98a8 45 virtual int disk_write(const char *buffer, int sector) {
cha45689 0:9296bb2a98a8 46 // if buffer is zero deallocate sector
cha45689 0:9296bb2a98a8 47 char zero[512];
cha45689 0:9296bb2a98a8 48 memset(zero, 0, 512);
cha45689 0:9296bb2a98a8 49 if(memcmp(zero, buffer, 512)==0) {
cha45689 0:9296bb2a98a8 50 if(sectors[sector] != 0) {
cha45689 0:9296bb2a98a8 51 free(sectors[sector]);
cha45689 0:9296bb2a98a8 52 sectors[sector] = 0;
cha45689 0:9296bb2a98a8 53 }
cha45689 0:9296bb2a98a8 54 return 0;
cha45689 0:9296bb2a98a8 55 }
cha45689 0:9296bb2a98a8 56 // else allocate a sector if needed, and write
cha45689 0:9296bb2a98a8 57 if(sectors[sector] == 0) {
cha45689 0:9296bb2a98a8 58 char *sec = (char*)malloc(512);
cha45689 0:9296bb2a98a8 59 if(sec==0) {
cha45689 0:9296bb2a98a8 60 return 1; // out of memory
cha45689 0:9296bb2a98a8 61 }
cha45689 0:9296bb2a98a8 62 sectors[sector] = sec;
cha45689 0:9296bb2a98a8 63 }
cha45689 0:9296bb2a98a8 64 memcpy(sectors[sector], buffer, 512);
cha45689 0:9296bb2a98a8 65 return 0;
cha45689 0:9296bb2a98a8 66 }
cha45689 0:9296bb2a98a8 67
cha45689 0:9296bb2a98a8 68 // return the number of sectors
cha45689 0:9296bb2a98a8 69 virtual int disk_sectors() {
cha45689 0:9296bb2a98a8 70 return sizeof(sectors)/sizeof(sectors[0]);
cha45689 0:9296bb2a98a8 71 }
cha45689 0:9296bb2a98a8 72
cha45689 0:9296bb2a98a8 73 };
cha45689 0:9296bb2a98a8 74
cha45689 0:9296bb2a98a8 75 }
cha45689 0:9296bb2a98a8 76
cha45689 0:9296bb2a98a8 77 #endif