//
//Copy a folder.This function makes recursive calls
// and once a regular file is encountered it calls
// the CopyExt2File() function.
//
void CopyFolder(DWORD inode,DWORD peslb)
{
int tdir =0;
DWORD prev_rec_len =0 ;
BYTE inodebuf[512];
struct ext2_inode *intab;
BYTE dirbuf[4096];
int i,k;
DWORD inodesam;
grblock = (struct group *)groupdescr;
inodesam=Inode_to_Lba(inode);
if(ReadDiskSector(inodebuf,disk,peslb+inodesam,1)==FALSE)
PrintError("Can not read disk sector");
i=Get_Index(inode);
intab=(struct ext2_inode *)&inodebuf[i*128];
for(k=0;k<12;k++)
{
if(intab->i_block[k]!=0)
{
prev_rec_len=0;
do{
strcpy(dirnam,"");
if(ReadDiskSector(dirbuf,disk,peslb+(size/512)*intab->i_block[k],size/512)==FALSE)
MessageBox(NULL , "Cannot Read Disk Sector ", "Error" , MB_OK);
direntry=(struct ext2_dir_entry_2 *)&dirbuf[prev_rec_len];
if(direntry->file_type==1)
{
strncpy(dirnam,direntry->name,direntry->name_len);
dirnam[direntry->name_len]='\0';
CopyExt2File(direntry->inode,peslb,dirnam);
}
if(direntry->file_type==2 && strcmp(direntry->name,".") && strcmp(direntry->name,".."))
{
strncpy(dirnam,direntry->name,direntry->name_len);
dirnam[direntry->name_len]='\0';
_mkdir(dirnam);
_chdir(dirnam);
tdir=direntry->rec_len;
CopyFolder(direntry->inode,peslb);
_chdir("..");
direntry->rec_len=tdir;
}
if(direntry->rec_len+prev_rec_len>=size) break;
prev_rec_len = direntry->rec_len+prev_rec_len;
}while(direntry->rec_len>0);
}
}
return;
}
// Read the MBR.The first 446 bytes are skipped.
// The next 64 bytes contains the partition table.
// and the last 2 bytes is the magic word "AA55"
void ReadMBR()
{
BYTE buf[512],i;
bslist=(struct bootsector *)malloc(sizeof(struct bootsector));
bslist->next=NULL;
ReadDiskSector(buf,disk,0,1);
for(i=0;i<4;i++)
bslist->part[i] = *((struct PartitionEntry*)&buf[446 + i*16]);
bslist->signature=*((WORD *)&buf[510]);
}
//Checks the super block of both the Ext2 as well
//as Reiser filesystems.
char * printsuper(enum DISK_TYPE disk,DWORD peslb)
{
int l=0;
if(ReadDiskSector(buf,disk,peslb+EXT2_SUPER_OFFSET,2)==FALSE)
PrintError("Can not read disk sector");
sb = (struct super_block *)malloc(sizeof(struct super_block));
sb = (struct super_block *)buf;
if(sb->magic==0xEF53)
{
strcpy(pathname[0],sb->volume_name);
l = (int)strlen(pathname[0]);
if(pathname[0][l-1]!='/')
{
pathname[0][l]='/';
pathname[0][l+1]='\0';
}
address_len = (int)strlen(pathname[0]);
size = (WORD)pow(2,10+sb->log_block_size);
return sb->volume_name;
}
else
{
char magic[13],buf[512];
reiser_sb = (struct reiser_super_block *)malloc(sizeof(struct reiser_super_block));
if(ReadDiskSector(buf,disk,peslb+REISERFS_SUPER_OFFSET,1)==FALSE)
PrintError("Can not read disk sector");
reiser_sb=(struct reiser_super_block *)buf;
wsprintf(magic,"%s",reiser_sb->magic);
magic[12]='\0';
if(strcmp(magic,"ReIsErFs")==0 || strcmp(magic,"ReIsEr2Fs")==0)
{
return ("ReiserFS");
}
}
return("No support");
}
void CopyExt2Block(DWORD block_address , FILE *outfile , int *blocksize)
{
char dataread[4096];
if(ReadDiskSector(dataread ,disk ,block_address,size/512)==FALSE)
PrintError("Can not read disk sector");
progress_count += 1;
if(progress_count==progress_mode)
{
SendMessage(hwndPB, PBM_STEPIT, 0, 0);
progress_count =0;
}
if(*blocksize > size)
{
fwrite((char *)&dataread,size,1,outfile);
*blocksize = *blocksize - size;
}
else
fwrite((char *)&dataread,(*blocksize),1,outfile);
}
//Read the bootsectors and check whether
//the signature is valid.
void GetBootSector(DWORD lba)
{
BYTE buf[512],i;
temp->next=(struct bootsector *)malloc(sizeof(struct bootsector));
temp=temp->next;
temp->next=NULL;
if(ReadDiskSector(buf,disk,lba,1)==TRUE)
{
for(i=0;i<4;i++)
temp->part[i]=*((struct PartitionEntry*)&buf[446 + i*16]);
temp->signature=*((WORD *)&buf[510]);
if(temp->signature==0xAA55)
CheckIfExt2FS(&temp->part[0],lba);
else
PrintError("\nBad signature...");
}
else
PrintError("\n ReadSector failed ");
if(temp->part[1].tb)
GetBootSector(temp->part[1].slba+extlba);
}
//
//Traverse a directory.The data blocks are
//mapped to the directory entry strcuture and
//assign the details of the files into the guifile structure.
//
void printinode(enum DISK_TYPE disk,DWORD peslb,DWORD inode)
{
int k=0,i,num=0,small_size=0;
WORD sindblock ;
DWORD prev_rec_len=0;
int count =0,isam;
BYTE inodebuf[512],indbuf[512];
BYTE sindbuf[4096];
BYTE dirbuf[4097];
DWORD past=0,inodesam;
DWORD n=0,m=0 ,j;
if((size==1024)||(size ==2048))
n=4;
else if(size==4096)
n=8;
if(ReadDiskSector(groupdescr,disk,peslb+n,1)==FALSE)
PrintError("Can not read disk sector");
grblock=(struct group *)malloc(sizeof(struct group));
grblock=(struct group *)groupdescr;
do
{
inodesam=Inode_to_Lba(inode);
if(ReadDiskSector(inodebuf,disk,peslb+inodesam,1)==FALSE)
PrintError("Can not read disk sector");
sb = (struct super_block *)buf;
i=Get_Index(inode);
intab[i]=(struct ext2_inode *)&inodebuf[i*128];
k=(intab[i]->i_mode&0xF000)>>12 ;
/********************READING DIRECTORY ENTRY **********************/
//printf("******DIRECT DATA BLOCKS\n");
for(k=0;k<12;k++)
{
if(intab[i]->i_block[k]!=0)
{
prev_rec_len=0;
if(ReadDiskSector(dirbuf,disk,peslb+(size/512)*intab[i]->i_block[k],size/512)==FALSE)
{
MessageBox(NULL , "Cannot Read Disk Sector ", "Error" , MB_OK);
exit(0);
return;
}
//printf("\n*****directory Entry*****%d\n",k);
do
{
direntry=(struct ext2_dir_entry_2*)&dirbuf[prev_rec_len];
strcpy(dirbuf,"");
if(strcmp(direntry->name,".")==0){ present_inode=direntry->inode;goto da;}
if(strcmp(direntry->name,"..")==0){ past=direntry->inode;}
for(j=0;j<direntry->name_len;j++)
{
guifile[count].filename[j] = direntry->name[j];
}
guifile[count].filename[direntry->name_len]='\0';
guifile[count].inode = direntry->inode;
inodesam=Inode_to_Lba(direntry->inode);
if(ReadDiskSector(indbuf,disk,peslb+inodesam,1)==FALSE)
PrintError("Can not read disk sector");
isam = Get_Index(direntry->inode);
intab1[isam]=(struct ext2_inode *)&indbuf[isam*128];
guifile[count].isize=intab1[isam]->i_size;
guifile[count].file_type=direntry->file_type;
strncpy(guifile[count].acrights,PrintMode(intab1[isam]->i_mode),13);
count++;
da:
if(direntry->rec_len+prev_rec_len>=size) goto a;
prev_rec_len = direntry->rec_len+prev_rec_len;
} while(direntry->rec_len>0);
}a: ;
}
//*********************READING DATA BLOCK ************************
//singly indirect block
if(intab[i]->i_block[12]!=0)
{
//printf("******SINGLY INDIRECT DATA BLOCK\n");
sindblock=size/4;
if(ReadDiskSector(sindbuf,disk,peslb+(size/512)*intab[i]->i_block[12],size/512)==FALSE)
PrintError("Can not read disk sector");
sind=(struct sindirect*)sindbuf;
for(j=0;j<sindblock;j++)
{
prev_rec_len=0;
if(sind->add[j]!=0)
{
if(ReadDiskSector(dirbuf,disk,peslb+(size/512)*sind->add[j],8)==FALSE)
PrintError("Can not read disk sector");
//printf("\n*****directory Entry*****\n");
do
{
direntry=(struct ext2_dir_entry_2*)&dirbuf[prev_rec_len];
strcpy(dirbuf,"");
//for(k=0;k<direntry->name_len;k++)
//printf("%c",direntry->name[k]);
direntry->name[direntry->name_len]='\0';
strcpy(guifile[count].filename,direntry->name);
guifile[count].inode = direntry->inode;
inodesam=Inode_to_Lba(direntry->inode);
if(ReadDiskSector(indbuf,disk,peslb+inodesam,1)==FALSE)
PrintError("Can not read disk sector");
isam = Get_Index(direntry->inode);
intab1[isam]=(struct ext2_inode *)&indbuf[isam*128];
guifile[count].file_type=direntry->file_type;
strncpy(guifile[count].acrights,PrintMode(intab1[isam]->i_mode),13);
count++;
if(direntry->rec_len+prev_rec_len>=size) goto b;
prev_rec_len = direntry->rec_len+prev_rec_len;
} while(direntry->rec_len>0);
}
b:;
}
}
//end:
num_files = count;
}while(ch=='y');
}
//
//Save a file from the partition to a file.
//Checks all the singly, doubly and triply indirect
//blocks and if allocated , calls the CopyExt2Block() function.
//
void CopyExt2File(DWORD inode,DWORD peslb,char * filename)
{
FILE * outfile;
int small_size=0,i;
char *inodebuf ; // to store the inode info of a file or folder
BYTE sindbuf[4096],dindbuf[4096],tindbuf[4096];
WORD j , k ,sindblock;
DWORD m,inodesam , fil_si ;
struct ext2_inode *intab;
struct tindirect *tind;
progress_count = 0;
inodebuf = (char*)malloc(512);
grblock = (struct group *)groupdescr;
inodesam = Inode_to_Lba(inode);
if(ReadDiskSector(inodebuf,disk,peslb+inodesam,1)==FALSE)
PrintError("Can not read disk sector");
i = Get_Index(inode);
intab = (struct ext2_inode *)&inodebuf[i*128];
progress_mode = ((intab->i_size/PROGRESS_RANGE)/size);
fil_si = intab->i_size;
if((outfile = fopen(filename,"wb"))==NULL)
{
return;
}
/********** Copying Direct Blocks *********/
for(m=0;m<12;m++)
{
if(intab->i_block[m]!=0)
CopyExt2Block(peslb+(size/512)*intab->i_block[m],outfile ,&fil_si);
}
/********* Copying Singly Indirect Block ********/
if(intab->i_block[12]!=0)
{
sindblock=size/4;
if(ReadDiskSector(sindbuf,disk,peslb+(size/512)*intab->i_block[12],size/512)==FALSE)
PrintError("Can not read disk sector");
sind=(struct sindirect*)sindbuf; //number of single indirect blocks
for(j=0;j<sindblock;j++)
{
if(sind->add[j]!=0)
CopyExt2Block(peslb+(size/512)*sind->add[j],outfile ,&fil_si);
}
}
/********** Copying Doubly Indirect Block *********/
if(intab->i_block[13]!=0)
{
if(ReadDiskSector(dindbuf,disk,peslb+(size/512)*intab->i_block[13],size/512)==FALSE)
PrintError("Can not read disk sector");
dind = (struct dindirect*)dindbuf;
for(j=0;j<sindblock;j++)
{
if(dind->add[j]!=0)
{
if(ReadDiskSector(sindbuf,disk,peslb+(size/512)*dind->add[j],size/512)==FALSE)
PrintError("Can not read disk sector");
sind = (struct sindirect*)sindbuf;
for(k=0;k<sindblock;k++)
if(sind->add[k]!=0)
CopyExt2Block(peslb+(size/512)*sind->add[k],
outfile,&fil_si);
}
}
}
/********** Copying Triply Indirect Block ********/
if(intab->i_block[14]!=0)
{
if(ReadDiskSector(tindbuf,disk,peslb+(size/512)*intab->i_block[14],size/512)==FALSE)
PrintError("Can not read disk sector");
tind = (struct tindirect*)tindbuf;
for(m=0;m<sindblock;m++)
{
if(tind->add[m]!=0)
{
if(ReadDiskSector(dindbuf,disk,peslb+(size/512)*tind->add[m],size/512)==FALSE)
PrintError("Can not read disk sector");
dind = (struct dindirect*)dindbuf;
for(j=0;j<sindblock;j++)
{
if(dind->add[j]!=0)
{
if(ReadDiskSector(sindbuf,disk,peslb+(size/512)*dind->add[j],size/512)==FALSE)
PrintError("Can not read disk sector");
sind = (struct sindirect*)sindbuf;
for(k=0;k<sindblock;k++)
if(sind->add[k]!=0)
CopyExt2Block(peslb+(size/512)*sind->add[k],
outfile ,&fil_si);
}
}
}
}
}
fclose(outfile);
free(inodebuf);
}