1fe4406f37
b9e0ea0 Merge commit '7fa9d8bdea3773d1195b04d98fcf27cf48ddd81d' as 'tool/mbed/mbed-sdk' 7fa9d8b Squashed 'tool/mbed/mbed-sdk/' content from commit 7c21ce5 git-subtree-dir: tmk_core git-subtree-split: b9e0ea08cb940de20b3610ecdda18e9d8cd7c552
77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
/* mbed Microcontroller Library - MemFileSystem
|
|
* Copyright (c) 2008, sford
|
|
*/
|
|
|
|
|
|
#ifndef MBED_MEMFILESYSTEM_H
|
|
#define MBED_MEMFILESYSTEM_H
|
|
|
|
#include "FATFileSystem.h"
|
|
|
|
namespace mbed
|
|
{
|
|
|
|
class MemFileSystem : public FATFileSystem
|
|
{
|
|
public:
|
|
|
|
// 2000 sectors, each 512 bytes (malloced as required)
|
|
char *sectors[2000];
|
|
|
|
MemFileSystem(const char* name) : FATFileSystem(name) {
|
|
memset(sectors, 0, sizeof(sectors));
|
|
}
|
|
|
|
virtual ~MemFileSystem() {
|
|
for(int i = 0; i < 2000; i++) {
|
|
if(sectors[i]) {
|
|
free(sectors[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
// read a sector in to the buffer, return 0 if ok
|
|
virtual int disk_read(char *buffer, int sector) {
|
|
if(sectors[sector] == 0) {
|
|
// nothing allocated means sector is empty
|
|
memset(buffer, 0, 512);
|
|
} else {
|
|
memcpy(buffer, sectors[sector], 512);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// write a sector from the buffer, return 0 if ok
|
|
virtual int disk_write(const char *buffer, int sector) {
|
|
// if buffer is zero deallocate sector
|
|
char zero[512];
|
|
memset(zero, 0, 512);
|
|
if(memcmp(zero, buffer, 512)==0) {
|
|
if(sectors[sector] != 0) {
|
|
free(sectors[sector]);
|
|
sectors[sector] = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
// else allocate a sector if needed, and write
|
|
if(sectors[sector] == 0) {
|
|
char *sec = (char*)malloc(512);
|
|
if(sec==0) {
|
|
return 1; // out of memory
|
|
}
|
|
sectors[sector] = sec;
|
|
}
|
|
memcpy(sectors[sector], buffer, 512);
|
|
return 0;
|
|
}
|
|
|
|
// return the number of sectors
|
|
virtual int disk_sectors() {
|
|
return sizeof(sectors)/sizeof(sectors[0]);
|
|
}
|
|
|
|
};
|
|
|
|
}
|
|
|
|
#endif |