dir.c

File: dir.h ScanOneDirectorySector(unsigned long sector, char *name) extern void MakeFileName(ch

//###########################################################
// File: dir.c
//
// Directory functions
//
// For FAT12, FAT16
// Only for first Partition
// Only for drives with 512 bytes per sector (the most)
//#########################################################################
#include <avr/io.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "dos.h"

//############################################################
// search for a filename or directoryname in current directory
//############################################################
unsigned char FindName(char *name)
{
 U8 i;
 unsigned char result;

 result=NO_MATCH;

 for(i=0; i<RootDirSectors; i++)
 {
  result = ScanOneDirectorySector(FirstRootSector+i, name);
  if(result!=NO_MATCH) 
   break; //break sector loop
 }

 return result;
}

//###########################################################
// find a filename
//
// Following global variables will be set if filename
// was found:
//
// FileFirstCluster  First cluster of the file
// FileSize
//
//###########################################################
unsigned char ScanOneDirectorySector(unsigned long sector, char *name)
{
 U16 count;
 unsigned long tmp;
 struct DirEntry *di;
 char nam[8];
 unsigned char i,match;

 MakeFileName(name,nam);
 
// by=ReadSector(sector,dirbuf); //read one directory sector.
 count=0;
 match=NO_MATCH;

 MMC_CS_OFF();
 MMCStartReadSector(sector);

 do
 {
  for(i=0; i<32; i++)
  {
   SPI_WRITE(0xFF);
   dirbuf[i]=SPDR;
  }
  di=(struct DirEntry *)dirbuf;
   
  if((unsigned char)di->DIR_Name[0]!=0xE5 && di->DIR_Name[0]>0 && match!=FULL_MATCH)
  {
   di->DIR_Attr&=0x3F;            //smash upper two bits

   if(di->DIR_Attr==ATTR_LONG_NAME)
   {
   }
   else
   {
    if(strncmp(nam,di->DIR_Name,8)==0) match=FULL_MATCH;
                
    if(di->DIR_Attr & ATTR_VOLUME_ID)
    {
    }
    else
    {
     if(di->DIR_Attr & ATTR_DIRECTORY) //this is a directory
     {
     }//if(di->DIR_Attr & ATTR_DIRECTORY)
     else //is not a directory. this is a file
     {
      tmp=di->DIR_FstClusHI; //Highword of first cluster number
      tmp<<=16;
      tmp+=di->DIR_FstClusLO; //Lowword of first cluster number

      if(match==FULL_MATCH)
      {
       FileFirstCluster=tmp;
       FileSize=di->DIR_FileSize;
      } 

     }//if(di->DIR_Attr & ATTR_DIRECTORY)
    }
   }       
  }//if(di->DIR_Name[0]!=0xE5 && di->DIR_Name[0]>0)
        
  count+=32;
 }
 while(count<BYTE_PER_SEC);

 SPI_WRITE(0xFF); //CRC
 SPI_WRITE(0xFF);
 MMC_CS_ON();

 return match;
}

//###########################################################
//
//###########################################################
void MakeFileName(char *inname, char *outname)
{
 unsigned char by,i;
 char *p;

 p=outname;
 for(i=0; i<8; i++) *p++=' '; //fill filename buffer with spaces

 p=outname;

 i=0; //get filename
 do
 {
  by=inname[i];
  if(by!=0) *p++=by;
  i++;
 }while(i<8 && by!=0);
}