James Heavey / Mbed 2 deprecated 2665-Breakout-Game

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependencies:   mbed

SDFileSystem/FATFileSystem/MemFileSystem.h@0:92b180c8d407, 2021-01-05 (annotated)

Committer:
jamesheavey
Date:
Tue Jan 05 01:14:11 2021 +0000
Revision:
0:92b180c8d407
test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jamesheavey 0:92b180c8d407 1 /* mbed Microcontroller Library - MemFileSystem
jamesheavey 0:92b180c8d407 2 * Copyright (c) 2008, sford
jamesheavey 0:92b180c8d407 3 */
jamesheavey 0:92b180c8d407 4
jamesheavey 0:92b180c8d407 5
jamesheavey 0:92b180c8d407 6 #ifndef MBED_MEMFILESYSTEM_H
jamesheavey 0:92b180c8d407 7 #define MBED_MEMFILESYSTEM_H
jamesheavey 0:92b180c8d407 8
jamesheavey 0:92b180c8d407 9 #include "FATFileSystem.h"
jamesheavey 0:92b180c8d407 10
jamesheavey 0:92b180c8d407 11 namespace mbed
jamesheavey 0:92b180c8d407 12 {
jamesheavey 0:92b180c8d407 13
jamesheavey 0:92b180c8d407 14 class MemFileSystem : public FATFileSystem
jamesheavey 0:92b180c8d407 15 {
jamesheavey 0:92b180c8d407 16 public:
jamesheavey 0:92b180c8d407 17
jamesheavey 0:92b180c8d407 18 // 2000 sectors, each 512 bytes (malloced as required)
jamesheavey 0:92b180c8d407 19 char *sectors[2000];
jamesheavey 0:92b180c8d407 20
jamesheavey 0:92b180c8d407 21 MemFileSystem(const char* name) : FATFileSystem(name) {
jamesheavey 0:92b180c8d407 22 memset(sectors, 0, sizeof(sectors));
jamesheavey 0:92b180c8d407 23 }
jamesheavey 0:92b180c8d407 24
jamesheavey 0:92b180c8d407 25 virtual ~MemFileSystem() {
jamesheavey 0:92b180c8d407 26 for(int i = 0; i < 2000; i++) {
jamesheavey 0:92b180c8d407 27 if(sectors[i]) {
jamesheavey 0:92b180c8d407 28 free(sectors[i]);
jamesheavey 0:92b180c8d407 29 }
jamesheavey 0:92b180c8d407 30 }
jamesheavey 0:92b180c8d407 31 }
jamesheavey 0:92b180c8d407 32
jamesheavey 0:92b180c8d407 33 // read a sector in to the buffer, return 0 if ok
jamesheavey 0:92b180c8d407 34 virtual int disk_read(char *buffer, int sector) {
jamesheavey 0:92b180c8d407 35 if(sectors[sector] == 0) {
jamesheavey 0:92b180c8d407 36 // nothing allocated means sector is empty
jamesheavey 0:92b180c8d407 37 memset(buffer, 0, 512);
jamesheavey 0:92b180c8d407 38 } else {
jamesheavey 0:92b180c8d407 39 memcpy(buffer, sectors[sector], 512);
jamesheavey 0:92b180c8d407 40 }
jamesheavey 0:92b180c8d407 41 return 0;
jamesheavey 0:92b180c8d407 42 }
jamesheavey 0:92b180c8d407 43
jamesheavey 0:92b180c8d407 44 // write a sector from the buffer, return 0 if ok
jamesheavey 0:92b180c8d407 45 virtual int disk_write(const char *buffer, int sector) {
jamesheavey 0:92b180c8d407 46 // if buffer is zero deallocate sector
jamesheavey 0:92b180c8d407 47 char zero[512];
jamesheavey 0:92b180c8d407 48 memset(zero, 0, 512);
jamesheavey 0:92b180c8d407 49 if(memcmp(zero, buffer, 512)==0) {
jamesheavey 0:92b180c8d407 50 if(sectors[sector] != 0) {
jamesheavey 0:92b180c8d407 51 free(sectors[sector]);
jamesheavey 0:92b180c8d407 52 sectors[sector] = 0;
jamesheavey 0:92b180c8d407 53 }
jamesheavey 0:92b180c8d407 54 return 0;
jamesheavey 0:92b180c8d407 55 }
jamesheavey 0:92b180c8d407 56 // else allocate a sector if needed, and write
jamesheavey 0:92b180c8d407 57 if(sectors[sector] == 0) {
jamesheavey 0:92b180c8d407 58 char *sec = (char*)malloc(512);
jamesheavey 0:92b180c8d407 59 if(sec==0) {
jamesheavey 0:92b180c8d407 60 return 1; // out of memory
jamesheavey 0:92b180c8d407 61 }
jamesheavey 0:92b180c8d407 62 sectors[sector] = sec;
jamesheavey 0:92b180c8d407 63 }
jamesheavey 0:92b180c8d407 64 memcpy(sectors[sector], buffer, 512);
jamesheavey 0:92b180c8d407 65 return 0;
jamesheavey 0:92b180c8d407 66 }
jamesheavey 0:92b180c8d407 67
jamesheavey 0:92b180c8d407 68 // return the number of sectors
jamesheavey 0:92b180c8d407 69 virtual int disk_sectors() {
jamesheavey 0:92b180c8d407 70 return sizeof(sectors)/sizeof(sectors[0]);
jamesheavey 0:92b180c8d407 71 }
jamesheavey 0:92b180c8d407 72
jamesheavey 0:92b180c8d407 73 };
jamesheavey 0:92b180c8d407 74
jamesheavey 0:92b180c8d407 75 }
jamesheavey 0:92b180c8d407 76
jamesheavey 0:92b180c8d407 77 #endif