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Dependencies:   FFT

FATFileSystem/MemFileSystem.h@7:0d62545e6d73, 2020-12-03 (annotated)

Committer:
shyamgatech
Date:
Thu Dec 03 18:15:35 2020 +0000
Revision:
7:0d62545e6d73
Parent:
0:d6c9b09b4042 
addded gui mbed code;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
annieluo2 0:d6c9b09b4042 1 /* mbed Microcontroller Library - MemFileSystem
annieluo2 0:d6c9b09b4042 2 * Copyright (c) 2008, sford
annieluo2 0:d6c9b09b4042 3 */
annieluo2 0:d6c9b09b4042 4
annieluo2 0:d6c9b09b4042 5
annieluo2 0:d6c9b09b4042 6 #ifndef MBED_MEMFILESYSTEM_H
annieluo2 0:d6c9b09b4042 7 #define MBED_MEMFILESYSTEM_H
annieluo2 0:d6c9b09b4042 8
annieluo2 0:d6c9b09b4042 9 #include "FATFileSystem.h"
annieluo2 0:d6c9b09b4042 10
annieluo2 0:d6c9b09b4042 11 namespace mbed
annieluo2 0:d6c9b09b4042 12 {
annieluo2 0:d6c9b09b4042 13
annieluo2 0:d6c9b09b4042 14 class MemFileSystem : public FATFileSystem
annieluo2 0:d6c9b09b4042 15 {
annieluo2 0:d6c9b09b4042 16 public:
annieluo2 0:d6c9b09b4042 17
annieluo2 0:d6c9b09b4042 18 // 2000 sectors, each 512 bytes (malloced as required)
annieluo2 0:d6c9b09b4042 19 char *sectors[2000];
annieluo2 0:d6c9b09b4042 20
annieluo2 0:d6c9b09b4042 21 MemFileSystem(const char* name) : FATFileSystem(name) {
annieluo2 0:d6c9b09b4042 22 memset(sectors, 0, sizeof(sectors));
annieluo2 0:d6c9b09b4042 23 }
annieluo2 0:d6c9b09b4042 24
annieluo2 0:d6c9b09b4042 25 virtual ~MemFileSystem() {
annieluo2 0:d6c9b09b4042 26 for(int i = 0; i < 2000; i++) {
annieluo2 0:d6c9b09b4042 27 if(sectors[i]) {
annieluo2 0:d6c9b09b4042 28 free(sectors[i]);
annieluo2 0:d6c9b09b4042 29 }
annieluo2 0:d6c9b09b4042 30 }
annieluo2 0:d6c9b09b4042 31 }
annieluo2 0:d6c9b09b4042 32
annieluo2 0:d6c9b09b4042 33 // read a sector in to the buffer, return 0 if ok
annieluo2 0:d6c9b09b4042 34 virtual int disk_read(char *buffer, int sector) {
annieluo2 0:d6c9b09b4042 35 if(sectors[sector] == 0) {
annieluo2 0:d6c9b09b4042 36 // nothing allocated means sector is empty
annieluo2 0:d6c9b09b4042 37 memset(buffer, 0, 512);
annieluo2 0:d6c9b09b4042 38 } else {
annieluo2 0:d6c9b09b4042 39 memcpy(buffer, sectors[sector], 512);
annieluo2 0:d6c9b09b4042 40 }
annieluo2 0:d6c9b09b4042 41 return 0;
annieluo2 0:d6c9b09b4042 42 }
annieluo2 0:d6c9b09b4042 43
annieluo2 0:d6c9b09b4042 44 // write a sector from the buffer, return 0 if ok
annieluo2 0:d6c9b09b4042 45 virtual int disk_write(const char *buffer, int sector) {
annieluo2 0:d6c9b09b4042 46 // if buffer is zero deallocate sector
annieluo2 0:d6c9b09b4042 47 char zero[512];
annieluo2 0:d6c9b09b4042 48 memset(zero, 0, 512);
annieluo2 0:d6c9b09b4042 49 if(memcmp(zero, buffer, 512)==0) {
annieluo2 0:d6c9b09b4042 50 if(sectors[sector] != 0) {
annieluo2 0:d6c9b09b4042 51 free(sectors[sector]);
annieluo2 0:d6c9b09b4042 52 sectors[sector] = 0;
annieluo2 0:d6c9b09b4042 53 }
annieluo2 0:d6c9b09b4042 54 return 0;
annieluo2 0:d6c9b09b4042 55 }
annieluo2 0:d6c9b09b4042 56 // else allocate a sector if needed, and write
annieluo2 0:d6c9b09b4042 57 if(sectors[sector] == 0) {
annieluo2 0:d6c9b09b4042 58 char *sec = (char*)malloc(512);
annieluo2 0:d6c9b09b4042 59 if(sec==0) {
annieluo2 0:d6c9b09b4042 60 return 1; // out of memory
annieluo2 0:d6c9b09b4042 61 }
annieluo2 0:d6c9b09b4042 62 sectors[sector] = sec;
annieluo2 0:d6c9b09b4042 63 }
annieluo2 0:d6c9b09b4042 64 memcpy(sectors[sector], buffer, 512);
annieluo2 0:d6c9b09b4042 65 return 0;
annieluo2 0:d6c9b09b4042 66 }
annieluo2 0:d6c9b09b4042 67
annieluo2 0:d6c9b09b4042 68 // return the number of sectors
annieluo2 0:d6c9b09b4042 69 virtual int disk_sectors() {
annieluo2 0:d6c9b09b4042 70 return sizeof(sectors)/sizeof(sectors[0]);
annieluo2 0:d6c9b09b4042 71 }
annieluo2 0:d6c9b09b4042 72
annieluo2 0:d6c9b09b4042 73 };
annieluo2 0:d6c9b09b4042 74
annieluo2 0:d6c9b09b4042 75 }
annieluo2 0:d6c9b09b4042 76
annieluo2 0:d6c9b09b4042 77 #endif