ELEC2645 (2019/20) / Mbed 2 deprecated ELEC2645_Project_el18gs

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Dependencies:   mbed

SDFileSystem/FATFileSystem/MemFileSystem.h@17:3ebcf7bba112, 2020-05-26 (annotated)

Committer:
el18gs
Date:
Tue May 26 13:37:32 2020 +0000
Revision:
17:3ebcf7bba112
Parent:
2:eaf245af2aae 
Final Submission. I have read and agreed with Statement of Academic Integrity.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
el18gs 2:eaf245af2aae 1 /* mbed Microcontroller Library - MemFileSystem
el18gs 2:eaf245af2aae 2 * Copyright (c) 2008, sford
el18gs 2:eaf245af2aae 3 */
el18gs 2:eaf245af2aae 4
el18gs 2:eaf245af2aae 5
el18gs 2:eaf245af2aae 6 #ifndef MBED_MEMFILESYSTEM_H
el18gs 2:eaf245af2aae 7 #define MBED_MEMFILESYSTEM_H
el18gs 2:eaf245af2aae 8
el18gs 2:eaf245af2aae 9 #include "FATFileSystem.h"
el18gs 2:eaf245af2aae 10
el18gs 2:eaf245af2aae 11 namespace mbed
el18gs 2:eaf245af2aae 12 {
el18gs 2:eaf245af2aae 13
el18gs 2:eaf245af2aae 14 class MemFileSystem : public FATFileSystem
el18gs 2:eaf245af2aae 15 {
el18gs 2:eaf245af2aae 16 public:
el18gs 2:eaf245af2aae 17
el18gs 2:eaf245af2aae 18 // 2000 sectors, each 512 bytes (malloced as required)
el18gs 2:eaf245af2aae 19 char *sectors[2000];
el18gs 2:eaf245af2aae 20
el18gs 2:eaf245af2aae 21 MemFileSystem(const char* name) : FATFileSystem(name) {
el18gs 2:eaf245af2aae 22 memset(sectors, 0, sizeof(sectors));
el18gs 2:eaf245af2aae 23 }
el18gs 2:eaf245af2aae 24
el18gs 2:eaf245af2aae 25 virtual ~MemFileSystem() {
el18gs 2:eaf245af2aae 26 for(int i = 0; i < 2000; i++) {
el18gs 2:eaf245af2aae 27 if(sectors[i]) {
el18gs 2:eaf245af2aae 28 free(sectors[i]);
el18gs 2:eaf245af2aae 29 }
el18gs 2:eaf245af2aae 30 }
el18gs 2:eaf245af2aae 31 }
el18gs 2:eaf245af2aae 32
el18gs 2:eaf245af2aae 33 // read a sector in to the buffer, return 0 if ok
el18gs 2:eaf245af2aae 34 virtual int disk_read(char *buffer, int sector) {
el18gs 2:eaf245af2aae 35 if(sectors[sector] == 0) {
el18gs 2:eaf245af2aae 36 // nothing allocated means sector is empty
el18gs 2:eaf245af2aae 37 memset(buffer, 0, 512);
el18gs 2:eaf245af2aae 38 } else {
el18gs 2:eaf245af2aae 39 memcpy(buffer, sectors[sector], 512);
el18gs 2:eaf245af2aae 40 }
el18gs 2:eaf245af2aae 41 return 0;
el18gs 2:eaf245af2aae 42 }
el18gs 2:eaf245af2aae 43
el18gs 2:eaf245af2aae 44 // write a sector from the buffer, return 0 if ok
el18gs 2:eaf245af2aae 45 virtual int disk_write(const char *buffer, int sector) {
el18gs 2:eaf245af2aae 46 // if buffer is zero deallocate sector
el18gs 2:eaf245af2aae 47 char zero[512];
el18gs 2:eaf245af2aae 48 memset(zero, 0, 512);
el18gs 2:eaf245af2aae 49 if(memcmp(zero, buffer, 512)==0) {
el18gs 2:eaf245af2aae 50 if(sectors[sector] != 0) {
el18gs 2:eaf245af2aae 51 free(sectors[sector]);
el18gs 2:eaf245af2aae 52 sectors[sector] = 0;
el18gs 2:eaf245af2aae 53 }
el18gs 2:eaf245af2aae 54 return 0;
el18gs 2:eaf245af2aae 55 }
el18gs 2:eaf245af2aae 56 // else allocate a sector if needed, and write
el18gs 2:eaf245af2aae 57 if(sectors[sector] == 0) {
el18gs 2:eaf245af2aae 58 char *sec = (char*)malloc(512);
el18gs 2:eaf245af2aae 59 if(sec==0) {
el18gs 2:eaf245af2aae 60 return 1; // out of memory
el18gs 2:eaf245af2aae 61 }
el18gs 2:eaf245af2aae 62 sectors[sector] = sec;
el18gs 2:eaf245af2aae 63 }
el18gs 2:eaf245af2aae 64 memcpy(sectors[sector], buffer, 512);
el18gs 2:eaf245af2aae 65 return 0;
el18gs 2:eaf245af2aae 66 }
el18gs 2:eaf245af2aae 67
el18gs 2:eaf245af2aae 68 // return the number of sectors
el18gs 2:eaf245af2aae 69 virtual int disk_sectors() {
el18gs 2:eaf245af2aae 70 return sizeof(sectors)/sizeof(sectors[0]);
el18gs 2:eaf245af2aae 71 }
el18gs 2:eaf245af2aae 72
el18gs 2:eaf245af2aae 73 };
el18gs 2:eaf245af2aae 74
el18gs 2:eaf245af2aae 75 }
el18gs 2:eaf245af2aae 76
el18gs 2:eaf245af2aae 77 #endif