Mark Schwarzer / SDFileSystem

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Dependents:   Schwarzer_A7_1

FATFileSystem/MemFileSystem.h@0:964d386ab059, 2020-11-09 (annotated)

Committer:
markschwarzer
Date:
Mon Nov 09 14:25:13 2020 +0000
Revision:
0:964d386ab059
logged data in SD card

Who changed what in which revision?

UserRevisionLine numberNew contents of line
markschwarzer 0:964d386ab059 1 /* mbed Microcontroller Library - MemFileSystem
markschwarzer 0:964d386ab059 2 * Copyright (c) 2008, sford
markschwarzer 0:964d386ab059 3 */
markschwarzer 0:964d386ab059 4
markschwarzer 0:964d386ab059 5
markschwarzer 0:964d386ab059 6 #ifndef MBED_MEMFILESYSTEM_H
markschwarzer 0:964d386ab059 7 #define MBED_MEMFILESYSTEM_H
markschwarzer 0:964d386ab059 8
markschwarzer 0:964d386ab059 9 #include "FATFileSystem.h"
markschwarzer 0:964d386ab059 10
markschwarzer 0:964d386ab059 11 namespace mbed
markschwarzer 0:964d386ab059 12 {
markschwarzer 0:964d386ab059 13
markschwarzer 0:964d386ab059 14 class MemFileSystem : public FATFileSystem
markschwarzer 0:964d386ab059 15 {
markschwarzer 0:964d386ab059 16 public:
markschwarzer 0:964d386ab059 17
markschwarzer 0:964d386ab059 18 // 2000 sectors, each 512 bytes (malloced as required)
markschwarzer 0:964d386ab059 19 char *sectors[2000];
markschwarzer 0:964d386ab059 20
markschwarzer 0:964d386ab059 21 MemFileSystem(const char* name) : FATFileSystem(name) {
markschwarzer 0:964d386ab059 22 memset(sectors, 0, sizeof(sectors));
markschwarzer 0:964d386ab059 23 }
markschwarzer 0:964d386ab059 24
markschwarzer 0:964d386ab059 25 virtual ~MemFileSystem() {
markschwarzer 0:964d386ab059 26 for(int i = 0; i < 2000; i++) {
markschwarzer 0:964d386ab059 27 if(sectors[i]) {
markschwarzer 0:964d386ab059 28 free(sectors[i]);
markschwarzer 0:964d386ab059 29 }
markschwarzer 0:964d386ab059 30 }
markschwarzer 0:964d386ab059 31 }
markschwarzer 0:964d386ab059 32
markschwarzer 0:964d386ab059 33 // read a sector in to the buffer, return 0 if ok
markschwarzer 0:964d386ab059 34 virtual int disk_read(char *buffer, int sector) {
markschwarzer 0:964d386ab059 35 if(sectors[sector] == 0) {
markschwarzer 0:964d386ab059 36 // nothing allocated means sector is empty
markschwarzer 0:964d386ab059 37 memset(buffer, 0, 512);
markschwarzer 0:964d386ab059 38 } else {
markschwarzer 0:964d386ab059 39 memcpy(buffer, sectors[sector], 512);
markschwarzer 0:964d386ab059 40 }
markschwarzer 0:964d386ab059 41 return 0;
markschwarzer 0:964d386ab059 42 }
markschwarzer 0:964d386ab059 43
markschwarzer 0:964d386ab059 44 // write a sector from the buffer, return 0 if ok
markschwarzer 0:964d386ab059 45 virtual int disk_write(const char *buffer, int sector) {
markschwarzer 0:964d386ab059 46 // if buffer is zero deallocate sector
markschwarzer 0:964d386ab059 47 char zero[512];
markschwarzer 0:964d386ab059 48 memset(zero, 0, 512);
markschwarzer 0:964d386ab059 49 if(memcmp(zero, buffer, 512)==0) {
markschwarzer 0:964d386ab059 50 if(sectors[sector] != 0) {
markschwarzer 0:964d386ab059 51 free(sectors[sector]);
markschwarzer 0:964d386ab059 52 sectors[sector] = 0;
markschwarzer 0:964d386ab059 53 }
markschwarzer 0:964d386ab059 54 return 0;
markschwarzer 0:964d386ab059 55 }
markschwarzer 0:964d386ab059 56 // else allocate a sector if needed, and write
markschwarzer 0:964d386ab059 57 if(sectors[sector] == 0) {
markschwarzer 0:964d386ab059 58 char *sec = (char*)malloc(512);
markschwarzer 0:964d386ab059 59 if(sec==0) {
markschwarzer 0:964d386ab059 60 return 1; // out of memory
markschwarzer 0:964d386ab059 61 }
markschwarzer 0:964d386ab059 62 sectors[sector] = sec;
markschwarzer 0:964d386ab059 63 }
markschwarzer 0:964d386ab059 64 memcpy(sectors[sector], buffer, 512);
markschwarzer 0:964d386ab059 65 return 0;
markschwarzer 0:964d386ab059 66 }
markschwarzer 0:964d386ab059 67
markschwarzer 0:964d386ab059 68 // return the number of sectors
markschwarzer 0:964d386ab059 69 virtual int disk_sectors() {
markschwarzer 0:964d386ab059 70 return sizeof(sectors)/sizeof(sectors[0]);
markschwarzer 0:964d386ab059 71 }
markschwarzer 0:964d386ab059 72
markschwarzer 0:964d386ab059 73 };
markschwarzer 0:964d386ab059 74
markschwarzer 0:964d386ab059 75 }
markschwarzer 0:964d386ab059 76
markschwarzer 0:964d386ab059 77 #endif