Vergil Cola / SDFileSystem2

A fork of the original SDFileSystem, added only stat() for getting file information.

Dependents:   FRDM_K64F_IOT

Added code to the original SDFileSystem to export the stat() command. It would now be possible to get the FILEINFO struct of a directory entry to get information such as file size, etc.

SDFileSystem2 usage

#include "SDFileSystem.h"
SDFileSystem sd(p5,p6,p7,p8,"sd"); // mosi, miso, sck, cs 

static void cmd_ls(Stream * chp, int argc, char * argv[])
{
   DIR * dp;
   struct dirent * dirp;
   FILINFO fileInfo;
   char dirroot[256];
   
   if (argc >= 1)
       sprintf(dirroot, "/sd/%s", argv[0]);
   else
       sprintf(dirroot, "/sd");
   
   chp->printf("Listing directory [%s]\r\n", dirroot);
   
   dp = opendir(dirroot);			
   while((dirp = readdir(dp)) != NULL)
   {
       if (sd.stat(dirp->d_name, &fileInfo) == 0)
       {
           if (fileInfo.fattrib & AM_DIR )
                   chp->printf("<DIR>\t\t");
           else
                   chp->printf("%ld\t\t", fileInfo.fsize);
       }
       chp->printf("%s\r\n", dirp->d_name);
   }
   closedir(dp);
}

Diff: FATFileSystem/MemFileSystem.h

Revision:
0:572d27f56fcd
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FATFileSystem/MemFileSystem.h	Tue Apr 28 16:55:30 2015 +0000
@@ -0,0 +1,77 @@
+/* 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
\ No newline at end of file