Nicholas Herriot / VodafoneK3770Lib

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fatfs/MemFileSystem.h@0:9ad20223a8fa, 2012-07-17 (annotated)

Committer:
nherriot
Date:
Tue Jul 17 15:40:56 2012 +0000
Revision:
0:9ad20223a8fa
[mbed] converted /VodaDemoDoorControl/VodafoneK3770Lib

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nherriot 0:9ad20223a8fa 1 /* mbed Microcontroller Library - MemFileSystem
nherriot 0:9ad20223a8fa 2 * Copyright (c) 2008, sford
nherriot 0:9ad20223a8fa 3 */
nherriot 0:9ad20223a8fa 4
nherriot 0:9ad20223a8fa 5
nherriot 0:9ad20223a8fa 6 #ifndef MBED_MEMFILESYSTEM_H
nherriot 0:9ad20223a8fa 7 #define MBED_MEMFILESYSTEM_H
nherriot 0:9ad20223a8fa 8
nherriot 0:9ad20223a8fa 9 #include "FATFileSystem.h"
nherriot 0:9ad20223a8fa 10
nherriot 0:9ad20223a8fa 11 namespace mbed {
nherriot 0:9ad20223a8fa 12
nherriot 0:9ad20223a8fa 13 class MemFileSystem : public FATFileSystem {
nherriot 0:9ad20223a8fa 14 public:
nherriot 0:9ad20223a8fa 15
nherriot 0:9ad20223a8fa 16 // 2000 sectors, each 512 bytes (malloced as required)
nherriot 0:9ad20223a8fa 17 char *sectors[2000];
nherriot 0:9ad20223a8fa 18
nherriot 0:9ad20223a8fa 19 MemFileSystem(const char* name) : FATFileSystem(name) {
nherriot 0:9ad20223a8fa 20 memset(sectors, 0, 2000);
nherriot 0:9ad20223a8fa 21 }
nherriot 0:9ad20223a8fa 22
nherriot 0:9ad20223a8fa 23 virtual ~MemFileSystem() {
nherriot 0:9ad20223a8fa 24 for(int i = 0; i < 2000; i++) {
nherriot 0:9ad20223a8fa 25 if(sectors[i]) {
nherriot 0:9ad20223a8fa 26 free(sectors[i]);
nherriot 0:9ad20223a8fa 27 }
nherriot 0:9ad20223a8fa 28 }
nherriot 0:9ad20223a8fa 29 }
nherriot 0:9ad20223a8fa 30
nherriot 0:9ad20223a8fa 31 // read a sector in to the buffer, return 0 if ok
nherriot 0:9ad20223a8fa 32 virtual int disk_read(char *buffer, int sector) {
nherriot 0:9ad20223a8fa 33 if(sectors[sector] == 0) {
nherriot 0:9ad20223a8fa 34 // nothing allocated means sector is empty
nherriot 0:9ad20223a8fa 35 memset(buffer, 0, 512);
nherriot 0:9ad20223a8fa 36 } else {
nherriot 0:9ad20223a8fa 37 memcpy(buffer, sectors[sector], 512);
nherriot 0:9ad20223a8fa 38 }
nherriot 0:9ad20223a8fa 39 return 0;
nherriot 0:9ad20223a8fa 40 }
nherriot 0:9ad20223a8fa 41
nherriot 0:9ad20223a8fa 42 // write a sector from the buffer, return 0 if ok
nherriot 0:9ad20223a8fa 43 virtual int disk_write(const char *buffer, int sector) {
nherriot 0:9ad20223a8fa 44 // if buffer is zero deallocate sector
nherriot 0:9ad20223a8fa 45 char zero[512];
nherriot 0:9ad20223a8fa 46 memset(zero, 0, 512);
nherriot 0:9ad20223a8fa 47 if(memcmp(zero, buffer, 512)==0) {
nherriot 0:9ad20223a8fa 48 if(sectors[sector] != 0) {
nherriot 0:9ad20223a8fa 49 free(sectors[sector]);
nherriot 0:9ad20223a8fa 50 sectors[sector] = 0;
nherriot 0:9ad20223a8fa 51 }
nherriot 0:9ad20223a8fa 52 return 0;
nherriot 0:9ad20223a8fa 53 }
nherriot 0:9ad20223a8fa 54 // else allocate a sector if needed, and write
nherriot 0:9ad20223a8fa 55 if(sectors[sector] == 0) {
nherriot 0:9ad20223a8fa 56 char *sec = (char*)malloc(512);
nherriot 0:9ad20223a8fa 57 if(sec==0) {
nherriot 0:9ad20223a8fa 58 return 1; // out of memory
nherriot 0:9ad20223a8fa 59 }
nherriot 0:9ad20223a8fa 60 sectors[sector] = sec;
nherriot 0:9ad20223a8fa 61 }
nherriot 0:9ad20223a8fa 62 memcpy(sectors[sector], buffer, 512);
nherriot 0:9ad20223a8fa 63 return 0;
nherriot 0:9ad20223a8fa 64 }
nherriot 0:9ad20223a8fa 65
nherriot 0:9ad20223a8fa 66 // return the number of sectors
nherriot 0:9ad20223a8fa 67 virtual int disk_sectors() {
nherriot 0:9ad20223a8fa 68 return 2000;
nherriot 0:9ad20223a8fa 69 }
nherriot 0:9ad20223a8fa 70
nherriot 0:9ad20223a8fa 71 };
nherriot 0:9ad20223a8fa 72
nherriot 0:9ad20223a8fa 73 }
nherriot 0:9ad20223a8fa 74
nherriot 0:9ad20223a8fa 75 #endif