dirsearchbrowse.c

一个FAT32文件系统的源代码,可用于嵌入式系统,并能够直接在linux下直接验证.

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//					    FAT32 File IO Library Linux Test Version
//									  V1.0L
// 	  								Rob Riglar
//								Copyright 2003,2004 
//
//   					  Email: [e-mail]
//
//			   Compiled and tested on Redhat 'Shrike' with GNU gcc
//-----------------------------------------------------------------------------
//
// This file is part of FAT32 File IO Library.
//
// FAT32 File IO Library is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// FAT32 File IO Library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with FAT32 File IO Library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../IDE/IDE_Access.h"
#include "../FAT/FAT32_Base.h"
#include "../FAT/FAT32_Access.h"
#include "FileString.h"
#include "DirSearchBrowse.h"
#include "fatmisc.h"

#define clusterprint 1
//-----------------------------------------------------------------------------
// ListDirectory: Using starting cluster number of a directory and the FAT,
//				  list all directories and files 
//-----------------------------------------------------------------------------
void ListDirectory(UI32 StartCluster)
{
	byte i,item,index;
	word recordoffset;
	byte tempitem=0;
	byte LFNIndex=0;
	UI32 x=0;
	int statusreturned=0;
	  
  	FAT32.no_of_strings=0;
	FAT32.filenumber=0;
	printf("\r\nNo. 	   Filename\r\n");
	
  
	while (statusreturned!= 1) // Do while not end of cluster chain
	{
	// Read Sector
	statusreturned = FAT32_SectorReader(StartCluster, x++);

	if (!statusreturned)
	{
	LFNIndex=0;
	for (item=0; item<=15;item++)
		{
		 recordoffset = (32*item);
 
		 // Long File Name Text Found
		 if ( FATMisc_If_LFN_TextOnly(recordoffset) )   FATMisc_cacheLFN(recordoffset);
		 	 
		 // If Invalid record found delete any long file name information collated
		 else if ( FATMisc_If_LFN_Invalid(recordoffset) ) 	FAT32.no_of_strings = 0;  

		 // Normal Entry and Long text exists 
		 else if ( FATMisc_If_LFN_Exists(recordoffset,FAT32.no_of_strings) )
		 {
 	   	      FAT32.filenumber++; //File / Dir Count
		 	  if (FATMisc_If_dir_entry(recordoffset)) printf("\r\nDirectory ");
    		  if (FATMisc_If_file_entry(recordoffset)) printf("\r\nFile ");

			  // Print number of file or directory
			  
			  printf("%d -  ",FAT32.filenumber);
			  			  
			  for (index=0;index<FAT32.no_of_strings;index++)
		 	  	  for (i=0; i<13; i++)
			 	  	  putchar(FAT32.String[index][i]);
				 
			  // --- Print CLuster number
  			  if (clusterprint) printf("    Cluster Number 0x%lx", FATMisc_ClusterReassemble(recordoffset));
		 	  FAT32.no_of_strings=0;		  
		 }
		 
		 // Normal Entry, only 8.3 Text		 
		 else if ( FATMisc_If_noLFN_SFN_Only(recordoffset) )
		 {
       		  FAT32.no_of_strings=0;
			  FAT32.filenumber++; //File / Dir Count
		 	  if (FATMisc_If_dir_entry(recordoffset)) printf("\r\nDirectory ");
    		  if (FATMisc_If_file_entry(recordoffset)) printf("\r\nFile ");

			  // Print number of file or directory
			  printf("%d -  ",FAT32.filenumber);
			  
			  // Screen Print Name of file or directory
	  		  for (i=0; i<8;i++)
				{
					if ((IDE_SectorByte(i+recordoffset))!=0x20) putchar((IDE_SectorByte(i+recordoffset)));
				}
			  
			  // Dont Print dot seperator if is a directory
			  if ((IDE_SectorByte(8+recordoffset)!=0x20) && (IDE_SectorByte(9+recordoffset)!=0x20) && (IDE_SectorByte(10+recordoffset)!=0x20) ) putchar('.');

		      // Print 3 character extension
			  for (i=8; i<11;i++)
				  {
				 	if ((IDE_SectorByte(i+recordoffset))!=0x20) putchar((IDE_SectorByte(i+recordoffset)));
				  }
				  
			  // --- Print Cluster number
			  if (clusterprint) printf("    Cluster Number 0x%lx", FATMisc_ClusterReassemble(recordoffset));
		 }
		}// end of for
	}
	}
} 

//-------------------------------------------------------------
// MatchName: This function can be improved... 
//-------------------------------------------------------------
UI32 MatchName(UI32 Cluster, char *nametofind)
{

UI32 clusterchain=0;
byte item=0;
UI32 backupcluster=0;
UI32 recordoffset = 0;
UI32 ClustertoReturn = 0;
byte index=0;
byte i=0;
int lfncount=0;
int x=0;
char LFNtoMatch[maxLFNlength];
FAT32.no_of_strings = 0;

// Main cluster following loop
while (clusterchain!=1)
	{
	// Read sector
	clusterchain = FAT32_SectorReader(Cluster, x++);

	if (!clusterchain) // If sector read was successfull
	{
		// Analyse Sector
		for (item=0; item<=15;item++)
		{
			// Create the multiplier for sector access
			recordoffset = (32*item);

			// Long File Name Text Found
			if (FATMisc_If_LFN_TextOnly(recordoffset) ) FATMisc_cacheLFN(recordoffset);

			// If Invalid record found delete any long file name information collated
			else if (FATMisc_If_LFN_Invalid(recordoffset) ) FAT32.no_of_strings = 0;  

			// Normal SFN Entry and Long text exists 
			else if (FATMisc_If_LFN_Exists(recordoffset, FAT32.no_of_strings) ) 
				{

				// Copy LFN from LFN Cache into a string
				for (index=0;index<FAT32.no_of_strings;index++)
		 	  		for (i=0; i<13; i++)
						{
						// Check string isnt to long for array
						if (lfncount<maxLFNlength) LFNtoMatch[lfncount++] = FAT32.String[index][i];
						else 
							{
							printf("\r\nError: LFN to long for string memory");
							}
						}

				// Null terminate string
				LFNtoMatch[lfncount]='\0';

				// Compare names to see if they match
				if (FileString_CompareNames(LFNtoMatch, nametofind)) 
					{
					ClustertoReturn = FATMisc_ClusterReassemble(recordoffset);
					return (ClustertoReturn);
					}

		 			FAT32.no_of_strings=0;
					lfncount = 0;
				}

			// Normal Entry, only 8.3 Text		 
			else if (FATMisc_If_noLFN_SFN_Only(recordoffset) )
				{
       			FAT32.no_of_strings=0;
			  
				// Copy name to string
				for (i=0; i<11;i++) LFNtoMatch[lfncount++] = IDE_SectorByte(i+recordoffset);

				// Null terminate string
				LFNtoMatch[lfncount]='\0';
	  			
				// Compare names to see if they match
				if (FileString_CompareNames(LFNtoMatch, nametofind)) 
					{
					ClustertoReturn = FATMisc_ClusterReassemble(recordoffset);
					return (ClustertoReturn);
					}

		 		FAT32.no_of_strings=0;
				lfncount = 0;
				}
			} // End of if
		} // End of for loop

	} // End of while loop

return 0;
}