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FATFileSystem/MemFileSystem.h@37:22e8f744bbad, 2017-02-28 (annotated)

Committer:
dkato
Date:
Tue Feb 28 02:51:39 2017 +0000
Revision:
37:22e8f744bbad
Tentative change for FATFileSystem revision error.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dkato 37:22e8f744bbad 1 /* mbed Microcontroller Library - MemFileSystem
dkato 37:22e8f744bbad 2 * Copyright (c) 2008, sford
dkato 37:22e8f744bbad 3 */
dkato 37:22e8f744bbad 4
dkato 37:22e8f744bbad 5
dkato 37:22e8f744bbad 6 #ifndef MBED_MEMFILESYSTEM_H
dkato 37:22e8f744bbad 7 #define MBED_MEMFILESYSTEM_H
dkato 37:22e8f744bbad 8
dkato 37:22e8f744bbad 9 #include "FATFileSystem.h"
dkato 37:22e8f744bbad 10
dkato 37:22e8f744bbad 11 namespace mbed
dkato 37:22e8f744bbad 12 {
dkato 37:22e8f744bbad 13
dkato 37:22e8f744bbad 14 class MemFileSystem : public FATFileSystem
dkato 37:22e8f744bbad 15 {
dkato 37:22e8f744bbad 16 public:
dkato 37:22e8f744bbad 17
dkato 37:22e8f744bbad 18 // 2000 sectors, each 512 bytes (malloced as required)
dkato 37:22e8f744bbad 19 char *sectors[2000];
dkato 37:22e8f744bbad 20
dkato 37:22e8f744bbad 21 MemFileSystem(const char* name) : FATFileSystem(name) {
dkato 37:22e8f744bbad 22 memset(sectors, 0, sizeof(sectors));
dkato 37:22e8f744bbad 23 }
dkato 37:22e8f744bbad 24
dkato 37:22e8f744bbad 25 virtual ~MemFileSystem() {
dkato 37:22e8f744bbad 26 for(int i = 0; i < 2000; i++) {
dkato 37:22e8f744bbad 27 if(sectors[i]) {
dkato 37:22e8f744bbad 28 free(sectors[i]);
dkato 37:22e8f744bbad 29 }
dkato 37:22e8f744bbad 30 }
dkato 37:22e8f744bbad 31 }
dkato 37:22e8f744bbad 32
dkato 37:22e8f744bbad 33 // read a sector in to the buffer, return 0 if ok
dkato 37:22e8f744bbad 34 virtual int disk_read(char *buffer, int sector) {
dkato 37:22e8f744bbad 35 if(sectors[sector] == 0) {
dkato 37:22e8f744bbad 36 // nothing allocated means sector is empty
dkato 37:22e8f744bbad 37 memset(buffer, 0, 512);
dkato 37:22e8f744bbad 38 } else {
dkato 37:22e8f744bbad 39 memcpy(buffer, sectors[sector], 512);
dkato 37:22e8f744bbad 40 }
dkato 37:22e8f744bbad 41 return 0;
dkato 37:22e8f744bbad 42 }
dkato 37:22e8f744bbad 43
dkato 37:22e8f744bbad 44 // write a sector from the buffer, return 0 if ok
dkato 37:22e8f744bbad 45 virtual int disk_write(const char *buffer, int sector) {
dkato 37:22e8f744bbad 46 // if buffer is zero deallocate sector
dkato 37:22e8f744bbad 47 char zero[512];
dkato 37:22e8f744bbad 48 memset(zero, 0, 512);
dkato 37:22e8f744bbad 49 if(memcmp(zero, buffer, 512)==0) {
dkato 37:22e8f744bbad 50 if(sectors[sector] != 0) {
dkato 37:22e8f744bbad 51 free(sectors[sector]);
dkato 37:22e8f744bbad 52 sectors[sector] = 0;
dkato 37:22e8f744bbad 53 }
dkato 37:22e8f744bbad 54 return 0;
dkato 37:22e8f744bbad 55 }
dkato 37:22e8f744bbad 56 // else allocate a sector if needed, and write
dkato 37:22e8f744bbad 57 if(sectors[sector] == 0) {
dkato 37:22e8f744bbad 58 char *sec = (char*)malloc(512);
dkato 37:22e8f744bbad 59 if(sec==0) {
dkato 37:22e8f744bbad 60 return 1; // out of memory
dkato 37:22e8f744bbad 61 }
dkato 37:22e8f744bbad 62 sectors[sector] = sec;
dkato 37:22e8f744bbad 63 }
dkato 37:22e8f744bbad 64 memcpy(sectors[sector], buffer, 512);
dkato 37:22e8f744bbad 65 return 0;
dkato 37:22e8f744bbad 66 }
dkato 37:22e8f744bbad 67
dkato 37:22e8f744bbad 68 // return the number of sectors
dkato 37:22e8f744bbad 69 virtual int disk_sectors() {
dkato 37:22e8f744bbad 70 return sizeof(sectors)/sizeof(sectors[0]);
dkato 37:22e8f744bbad 71 }
dkato 37:22e8f744bbad 72
dkato 37:22e8f744bbad 73 };
dkato 37:22e8f744bbad 74
dkato 37:22e8f744bbad 75 }
dkato 37:22e8f744bbad 76
dkato 37:22e8f744bbad 77 #endif