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Dependencies:   mbed

USBHost/FATFileSystem/MemFileSystem.h@0:6ce9c65992e5, 2015-04-15 (annotated)

Committer:
dylancachan
Date:
Wed Apr 15 06:23:18 2015 +0000
Revision:
0:6ce9c65992e5
telemetre

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dylancachan 0:6ce9c65992e5 1 /* mbed Microcontroller Library - MemFileSystem
dylancachan 0:6ce9c65992e5 2 * Copyright (c) 2008, sford
dylancachan 0:6ce9c65992e5 3 */
dylancachan 0:6ce9c65992e5 4
dylancachan 0:6ce9c65992e5 5
dylancachan 0:6ce9c65992e5 6 #ifndef MBED_MEMFILESYSTEM_H
dylancachan 0:6ce9c65992e5 7 #define MBED_MEMFILESYSTEM_H
dylancachan 0:6ce9c65992e5 8
dylancachan 0:6ce9c65992e5 9 #include "FATFileSystem.h"
dylancachan 0:6ce9c65992e5 10
dylancachan 0:6ce9c65992e5 11 namespace mbed
dylancachan 0:6ce9c65992e5 12 {
dylancachan 0:6ce9c65992e5 13
dylancachan 0:6ce9c65992e5 14 class MemFileSystem : public FATFileSystem
dylancachan 0:6ce9c65992e5 15 {
dylancachan 0:6ce9c65992e5 16 public:
dylancachan 0:6ce9c65992e5 17
dylancachan 0:6ce9c65992e5 18 // 2000 sectors, each 512 bytes (malloced as required)
dylancachan 0:6ce9c65992e5 19 char *sectors[2000];
dylancachan 0:6ce9c65992e5 20
dylancachan 0:6ce9c65992e5 21 MemFileSystem(const char* name) : FATFileSystem(name) {
dylancachan 0:6ce9c65992e5 22 memset(sectors, 0, sizeof(sectors));
dylancachan 0:6ce9c65992e5 23 }
dylancachan 0:6ce9c65992e5 24
dylancachan 0:6ce9c65992e5 25 virtual ~MemFileSystem() {
dylancachan 0:6ce9c65992e5 26 for(int i = 0; i < 2000; i++) {
dylancachan 0:6ce9c65992e5 27 if(sectors[i]) {
dylancachan 0:6ce9c65992e5 28 free(sectors[i]);
dylancachan 0:6ce9c65992e5 29 }
dylancachan 0:6ce9c65992e5 30 }
dylancachan 0:6ce9c65992e5 31 }
dylancachan 0:6ce9c65992e5 32
dylancachan 0:6ce9c65992e5 33 // read a sector in to the buffer, return 0 if ok
dylancachan 0:6ce9c65992e5 34 virtual int disk_read(char *buffer, int sector) {
dylancachan 0:6ce9c65992e5 35 if(sectors[sector] == 0) {
dylancachan 0:6ce9c65992e5 36 // nothing allocated means sector is empty
dylancachan 0:6ce9c65992e5 37 memset(buffer, 0, 512);
dylancachan 0:6ce9c65992e5 38 } else {
dylancachan 0:6ce9c65992e5 39 memcpy(buffer, sectors[sector], 512);
dylancachan 0:6ce9c65992e5 40 }
dylancachan 0:6ce9c65992e5 41 return 0;
dylancachan 0:6ce9c65992e5 42 }
dylancachan 0:6ce9c65992e5 43
dylancachan 0:6ce9c65992e5 44 // write a sector from the buffer, return 0 if ok
dylancachan 0:6ce9c65992e5 45 virtual int disk_write(const char *buffer, int sector) {
dylancachan 0:6ce9c65992e5 46 // if buffer is zero deallocate sector
dylancachan 0:6ce9c65992e5 47 char zero[512];
dylancachan 0:6ce9c65992e5 48 memset(zero, 0, 512);
dylancachan 0:6ce9c65992e5 49 if(memcmp(zero, buffer, 512)==0) {
dylancachan 0:6ce9c65992e5 50 if(sectors[sector] != 0) {
dylancachan 0:6ce9c65992e5 51 free(sectors[sector]);
dylancachan 0:6ce9c65992e5 52 sectors[sector] = 0;
dylancachan 0:6ce9c65992e5 53 }
dylancachan 0:6ce9c65992e5 54 return 0;
dylancachan 0:6ce9c65992e5 55 }
dylancachan 0:6ce9c65992e5 56 // else allocate a sector if needed, and write
dylancachan 0:6ce9c65992e5 57 if(sectors[sector] == 0) {
dylancachan 0:6ce9c65992e5 58 char *sec = (char*)malloc(512);
dylancachan 0:6ce9c65992e5 59 if(sec==0) {
dylancachan 0:6ce9c65992e5 60 return 1; // out of memory
dylancachan 0:6ce9c65992e5 61 }
dylancachan 0:6ce9c65992e5 62 sectors[sector] = sec;
dylancachan 0:6ce9c65992e5 63 }
dylancachan 0:6ce9c65992e5 64 memcpy(sectors[sector], buffer, 512);
dylancachan 0:6ce9c65992e5 65 return 0;
dylancachan 0:6ce9c65992e5 66 }
dylancachan 0:6ce9c65992e5 67
dylancachan 0:6ce9c65992e5 68 // return the number of sectors
dylancachan 0:6ce9c65992e5 69 virtual int disk_sectors() {
dylancachan 0:6ce9c65992e5 70 return sizeof(sectors)/sizeof(sectors[0]);
dylancachan 0:6ce9c65992e5 71 }
dylancachan 0:6ce9c65992e5 72
dylancachan 0:6ce9c65992e5 73 };
dylancachan 0:6ce9c65992e5 74
dylancachan 0:6ce9c65992e5 75 }
dylancachan 0:6ce9c65992e5 76
dylancachan 0:6ce9c65992e5 77 #endif