141 lines
5.5 KiB
C
141 lines
5.5 KiB
C
/*****************************************************************************\
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* efs - General purpose Embedded Filesystem library *
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* --------------------- ----------------------------------- *
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* *
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* Filename : ls.c *
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* Description : This file contains functions to list the files in a directory *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; version 2 *
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* of the License. *
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*
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* As a special exception, if other files instantiate templates or *
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* use macros or inline functions from this file, or you compile this *
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* file and link it with other works to produce a work based on this file, *
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* this file does not by itself cause the resulting work to be covered *
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* by the GNU General Public License. However the source code for this *
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* file must still be made available in accordance with section (3) of *
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* the GNU General Public License. *
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* *
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* This exception does not invalidate any other reasons why a work based *
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* on this file might be covered by the GNU General Public License. *
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* *
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* (c)2006 Lennart Yseboodt *
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* (c)2006 Michael De Nil *
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\*****************************************************************************/
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/*****************************************************************************/
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#include "ls.h"
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/*****************************************************************************/
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esint8 ls_openDir(DirList *dlist,FileSystem *fs,eint8* dirname)
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{
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FileLocation loc;
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euint32 fc;
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dlist->fs=fs;
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if(fs_findFile(dlist->fs,dirname,&loc,&fc)!=2)
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{
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return(-1);
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}
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fs_initClusterChain(dlist->fs,&(dlist->Cache),fc);
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memClr(&(dlist->currentEntry),sizeof(dlist->currentEntry));
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dlist->rEntry=0;
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dlist->cEntry=0xFFFF;
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return(0);
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}
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/*****************************************************************************/
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esint8 ls_getDirEntry(DirList *dlist)
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{
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if(dlist->Cache.FirstCluster == 1){
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return(ls_getRootAreaEntry(dlist));
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}else if(dlist->Cache.FirstCluster){
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return(ls_getRealDirEntry(dlist));
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}
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return(-1);
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}
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/*****************************************************************************/
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esint8 ls_getNext(DirList *dlist)
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{
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do{
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if(ls_getDirEntry(dlist))return(-1);
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dlist->rEntry++;
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}while(!ls_isValidFileEntry(&(dlist->currentEntry)));
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dlist->cEntry++;
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return(0);
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}
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/*****************************************************************************/
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esint8 ls_getRealDirEntry(DirList *dlist)
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{
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euint8* buf;
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if(dlist->Cache.FirstCluster<=1)return(-1);
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if(fat_LogicToDiscCluster(dlist->fs,
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&(dlist->Cache),
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(dlist->rEntry)/(16 * dlist->fs->volumeId.SectorsPerCluster))){
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return(-1);
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}
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buf = part_getSect(dlist->fs->part,
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fs_clusterToSector(dlist->fs,dlist->Cache.DiscCluster) + (dlist->rEntry/16)%dlist->fs->volumeId.SectorsPerCluster,
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IOM_MODE_READONLY);
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/*memCpy(buf+(dlist->rEntry%16)*32,&(dlist->currentEntry),32);*/
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ls_fileEntryToDirListEntry(dlist,buf,32*(dlist->rEntry%16));
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part_relSect(dlist->fs->part,buf);
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return(0);
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}
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/*****************************************************************************/
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esint8 ls_getRootAreaEntry(DirList *dlist)
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{
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euint8 *buf=0;
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if((dlist->fs->type != FAT12) && (dlist->fs->type != FAT16))return(-1);
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if(dlist->rEntry>=dlist->fs->volumeId.RootEntryCount)return(-1);
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buf = part_getSect(dlist->fs->part,
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dlist->fs->FirstSectorRootDir+dlist->rEntry/16,
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IOM_MODE_READONLY);
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/*memCpy(buf+32*(dlist->rEntry%16),&(dlist->currentEntry),32);*/
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ls_fileEntryToDirListEntry(dlist,buf,32*(dlist->rEntry%16));
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part_relSect(dlist->fs->part,buf);
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return(0);
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}
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/*****************************************************************************/
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esint8 ls_isValidFileEntry(ListDirEntry *entry)
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{
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if(entry->FileName[0] == 0 || entry->FileName[0] == 0xE5 || entry->FileName[0] == '.')return(0);
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if((entry->Attribute&0x0F)==0x0F)return(0);
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return(1);
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}
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/*****************************************************************************/
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void ls_fileEntryToDirListEntry(DirList *dlist, euint8* buf, euint16 offset)
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{
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if(offset>480 || offset%32)return;
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buf+=offset;
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memCpy(buf+OFFSET_DE_FILENAME,dlist->currentEntry.FileName,LIST_MAXLENFILENAME);
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dlist->currentEntry.Attribute = *(buf+OFFSET_DE_ATTRIBUTE);
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dlist->currentEntry.FileSize = ex_getb32(buf,OFFSET_DE_FILESIZE);
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}
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/*****************************************************************************/
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