Adam Green
/
WeatherStation
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Dependencies: FatFileSystem mbed WeatherMeters SDFileSystem
FatFileSystem/MemFileSystem.h@0:616601bde9fb, 2012-02-23 (annotated)
- Committer:
- AdamGreen
- Date:
- Thu Feb 23 21:38:39 2012 +0000
- Revision:
- 0:616601bde9fb
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| AdamGreen | 0:616601bde9fb | 1 | /* mbed Microcontroller Library - MemFileSystem |
| AdamGreen | 0:616601bde9fb | 2 | * Copyright (c) 2008, sford |
| AdamGreen | 0:616601bde9fb | 3 | */ |
| AdamGreen | 0:616601bde9fb | 4 | |
| AdamGreen | 0:616601bde9fb | 5 | |
| AdamGreen | 0:616601bde9fb | 6 | #ifndef MBED_MEMFILESYSTEM_H |
| AdamGreen | 0:616601bde9fb | 7 | #define MBED_MEMFILESYSTEM_H |
| AdamGreen | 0:616601bde9fb | 8 | |
| AdamGreen | 0:616601bde9fb | 9 | #include "FATFileSystem.h" |
| AdamGreen | 0:616601bde9fb | 10 | |
| AdamGreen | 0:616601bde9fb | 11 | namespace mbed { |
| AdamGreen | 0:616601bde9fb | 12 | |
| AdamGreen | 0:616601bde9fb | 13 | class MemFileSystem : public FATFileSystem { |
| AdamGreen | 0:616601bde9fb | 14 | public: |
| AdamGreen | 0:616601bde9fb | 15 | |
| AdamGreen | 0:616601bde9fb | 16 | // 2000 sectors, each 512 bytes (malloced as required) |
| AdamGreen | 0:616601bde9fb | 17 | char *sectors[2000]; |
| AdamGreen | 0:616601bde9fb | 18 | |
| AdamGreen | 0:616601bde9fb | 19 | MemFileSystem(const char* name) : FATFileSystem(name) { |
| AdamGreen | 0:616601bde9fb | 20 | memset(sectors, 0, sizeof(sectors)); |
| AdamGreen | 0:616601bde9fb | 21 | } |
| AdamGreen | 0:616601bde9fb | 22 | |
| AdamGreen | 0:616601bde9fb | 23 | virtual ~MemFileSystem() { |
| AdamGreen | 0:616601bde9fb | 24 | for(int i = 0; i < 2000; i++) { |
| AdamGreen | 0:616601bde9fb | 25 | if(sectors[i]) { |
| AdamGreen | 0:616601bde9fb | 26 | free(sectors[i]); |
| AdamGreen | 0:616601bde9fb | 27 | } |
| AdamGreen | 0:616601bde9fb | 28 | } |
| AdamGreen | 0:616601bde9fb | 29 | } |
| AdamGreen | 0:616601bde9fb | 30 | |
| AdamGreen | 0:616601bde9fb | 31 | // read a sector in to the buffer, return 0 if ok |
| AdamGreen | 0:616601bde9fb | 32 | virtual int disk_read(char *buffer, int sector) { |
| AdamGreen | 0:616601bde9fb | 33 | if(sectors[sector] == 0) { |
| AdamGreen | 0:616601bde9fb | 34 | // nothing allocated means sector is empty |
| AdamGreen | 0:616601bde9fb | 35 | memset(buffer, 0, 512); |
| AdamGreen | 0:616601bde9fb | 36 | } else { |
| AdamGreen | 0:616601bde9fb | 37 | memcpy(buffer, sectors[sector], 512); |
| AdamGreen | 0:616601bde9fb | 38 | } |
| AdamGreen | 0:616601bde9fb | 39 | return 0; |
| AdamGreen | 0:616601bde9fb | 40 | } |
| AdamGreen | 0:616601bde9fb | 41 | |
| AdamGreen | 0:616601bde9fb | 42 | // write a sector from the buffer, return 0 if ok |
| AdamGreen | 0:616601bde9fb | 43 | virtual int disk_write(const char *buffer, int sector) { |
| AdamGreen | 0:616601bde9fb | 44 | // if buffer is zero deallocate sector |
| AdamGreen | 0:616601bde9fb | 45 | char zero[512]; |
| AdamGreen | 0:616601bde9fb | 46 | memset(zero, 0, 512); |
| AdamGreen | 0:616601bde9fb | 47 | if(memcmp(zero, buffer, 512)==0) { |
| AdamGreen | 0:616601bde9fb | 48 | if(sectors[sector] != 0) { |
| AdamGreen | 0:616601bde9fb | 49 | free(sectors[sector]); |
| AdamGreen | 0:616601bde9fb | 50 | sectors[sector] = 0; |
| AdamGreen | 0:616601bde9fb | 51 | } |
| AdamGreen | 0:616601bde9fb | 52 | return 0; |
| AdamGreen | 0:616601bde9fb | 53 | } |
| AdamGreen | 0:616601bde9fb | 54 | // else allocate a sector if needed, and write |
| AdamGreen | 0:616601bde9fb | 55 | if(sectors[sector] == 0) { |
| AdamGreen | 0:616601bde9fb | 56 | char *sec = (char*)malloc(512); |
| AdamGreen | 0:616601bde9fb | 57 | if(sec==0) { |
| AdamGreen | 0:616601bde9fb | 58 | return 1; // out of memory |
| AdamGreen | 0:616601bde9fb | 59 | } |
| AdamGreen | 0:616601bde9fb | 60 | sectors[sector] = sec; |
| AdamGreen | 0:616601bde9fb | 61 | } |
| AdamGreen | 0:616601bde9fb | 62 | memcpy(sectors[sector], buffer, 512); |
| AdamGreen | 0:616601bde9fb | 63 | return 0; |
| AdamGreen | 0:616601bde9fb | 64 | } |
| AdamGreen | 0:616601bde9fb | 65 | |
| AdamGreen | 0:616601bde9fb | 66 | // return the number of sectors |
| AdamGreen | 0:616601bde9fb | 67 | virtual int disk_sectors() { |
| AdamGreen | 0:616601bde9fb | 68 | return sizeof(sectors)/sizeof(sectors[0]); |
| AdamGreen | 0:616601bde9fb | 69 | } |
| AdamGreen | 0:616601bde9fb | 70 | |
| AdamGreen | 0:616601bde9fb | 71 | }; |
| AdamGreen | 0:616601bde9fb | 72 | |
| AdamGreen | 0:616601bde9fb | 73 | } |
| AdamGreen | 0:616601bde9fb | 74 | |
| AdamGreen | 0:616601bde9fb | 75 | #endif |