/*
/usr/src/ext2ed/file_com.c
A part of the extended file system 2 disk editor.
----------------------------
Commands which handle a file
----------------------------
First written on: April 18 1995
Copyright (C) 1995 Gadi Oxman
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ext2ed.h"
int init_file_info (void)
{
struct ext2_inode *ptr;
ptr=&type_data.u.t_ext2_inode;
file_info.inode_ptr=ptr;
file_info.inode_offset=device_offset;
file_info.global_block_num=ptr->i_block [0];
file_info.global_block_offset=ptr->i_block [0]*file_system_info.block_size;
file_info.block_num=0;
file_info.blocks_count=(ptr->i_size+file_system_info.block_size-1)/file_system_info.block_size;
file_info.file_offset=0;
file_info.file_length=ptr->i_size;
file_info.level=0;
file_info.offset_in_block=0;
file_info.display=HEX;
low_read (file_info.buffer,file_system_info.block_size,file_info.global_block_offset);
return (1);
}
void type_file___inode (char *command_line)
{
dispatch ("settype ext2_inode");
}
void type_file___show (char *command_line)
{
if (file_info.display==HEX)
file_show_hex ();
if (file_info.display==TEXT)
file_show_text ();
}
void type_file___nextblock (char *command_line)
{
long block_offset=1;
char *ptr,buffer [80];
ptr=parse_word (command_line,buffer);
if (*ptr!=0) {
ptr=parse_word (ptr,buffer);
block_offset*=atol (buffer);
}
if (file_info.block_num+block_offset >= file_info.blocks_count) {
wprintw (command_win,"Error - Block offset out of range\n");wrefresh (command_win);
return;
}
file_info.block_num+=block_offset;
file_info.global_block_num=file_block_to_global_block (file_info.block_num,&file_info);
file_info.global_block_offset=file_info.global_block_num*file_system_info.block_size;
file_info.file_offset=file_info.block_num*file_system_info.block_size;
low_read (file_info.buffer,file_system_info.block_size,file_info.global_block_offset);
strcpy (buffer,"show");dispatch (buffer);
}
void type_file___next (char *command_line)
{
int offset=1;
char *ptr,buffer [80];
ptr=parse_word (command_line,buffer);
if (*ptr!=0) {
ptr=parse_word (ptr,buffer);
offset*=atol (buffer);
}
if (file_info.offset_in_block+offset < file_system_info.block_size) {
file_info.offset_in_block+=offset;
sprintf (buffer,"show");dispatch (buffer);
}
else {
wprintw (command_win,"Error - Offset out of block\n");refresh_command_win ();
}
}
void type_file___offset (char *command_line)
{
unsigned long offset;
char *ptr,buffer [80];
ptr=parse_word (command_line,buffer);
if (*ptr!=0) {
ptr=parse_word (ptr,buffer);
offset=atol (buffer);
}
else {
wprintw (command_win,"Error - Argument not specified\n");refresh_command_win ();
return;
}
if (offset < file_system_info.block_size) {
file_info.offset_in_block=offset;
sprintf (buffer,"show");dispatch (buffer);
}
else {
wprintw (command_win,"Error - Offset out of block\n");refresh_command_win ();
}
}
void type_file___prev (char *command_line)
{
int offset=1;
char *ptr,buffer [80];
ptr=parse_word (command_line,buffer);
if (*ptr!=0) {
ptr=parse_word (ptr,buffer);
offset*=atol (buffer);
}
if (file_info.offset_in_block-offset >= 0) {
file_info.offset_in_block-=offset;
sprintf (buffer,"show");dispatch (buffer);
}
else {
wprintw (command_win,"Error - Offset out of block\n");refresh_command_win ();
}
}
void type_file___prevblock (char *command_line)
{
long block_offset=1;
char *ptr,buffer [80];
ptr=parse_word (command_line,buffer);
if (*ptr!=0) {
ptr=parse_word (ptr,buffer);
block_offset*=atol (buffer);
}
if (file_info.block_num-block_offset < 0) {
wprintw (command_win,"Error - Block offset out of range\n");wrefresh (command_win);
return;
}
file_info.block_num-=block_offset;
file_info.global_block_num=file_block_to_global_block (file_info.block_num,&file_info);
file_info.global_block_offset=file_info.global_block_num*file_system_info.block_size;
file_info.file_offset=file_info.block_num*file_system_info.block_size;
low_read (file_info.buffer,file_system_info.block_size,file_info.global_block_offset);
strcpy (buffer,"show");dispatch (buffer);
}
void type_file___block (char *command_line)
{
long block_offset=1;
char *ptr,buffer [80];
ptr=parse_word (command_line,buffer);
if (*ptr==0) {
wprintw (command_win,"Error - Invalid arguments\n");wrefresh (command_win);
return;
}
ptr=parse_word (ptr,buffer);
block_offset=atol (buffer);
if (block_offset < 0 || block_offset >= file_info.blocks_count) {
wprintw (command_win,"Error - Block offset out of range\n");wrefresh (command_win);
return;
}
file_info.block_num=block_offset;
file_info.global_block_num=file_block_to_global_block (file_info.block_num,&file_info);
file_info.global_block_offset=file_info.global_block_num*file_system_info.block_size;
file_info.file_offset=file_info.block_num*file_system_info.block_size;
low_read (file_info.buffer,file_system_info.block_size,file_info.global_block_offset);
strcpy (buffer,"show");dispatch (buffer);
}
void type_file___display (char *command_line)
{
char *ptr,buffer [80];
ptr=parse_word (command_line,buffer);
if (*ptr==0)
strcpy (buffer,"hex");
else
ptr=parse_word (ptr,buffer);
if (strcasecmp (buffer,"hex")==0) {
wprintw (command_win,"Display set to hex\n");wrefresh (command_win);
file_info.display=HEX;
sprintf (buffer,"show");dispatch (buffer);
}
else if (strcasecmp (buffer,"text")==0) {
wprintw (command_win,"Display set to text\n");wrefresh (command_win);
file_info.display=TEXT;
sprintf (buffer,"show");dispatch (buffer);
}
else {
wprintw (command_win,"Error - Invalid arguments\n");wrefresh (command_win);
}
}
void file_show_hex (void)
{
long offset=0,l,i;
unsigned char *ch_ptr;
/* device_offset and type_data points to the inode */
show_pad_info.line=0;
wmove (show_pad,0,0);
ch_ptr=file_info.buffer;
for (l=0;l<file_system_info.block_size/16;l++) {
if (file_info.file_offset+offset>file_info.file_length-1) break;
wprintw (show_pad,"%08ld : ",offset);
for (i=0;i<16;i++) {
if (file_info.file_offset+offset+i>file_info.file_length-1) {
wprintw (show_pad," ");
}
else {
if (file_info.offset_in_block==offset+i)
wattrset (show_pad,A_REVERSE);
if (ch_ptr [i]>=' ' && ch_ptr [i]<='z')
wprintw (show_pad,"%c",ch_ptr [i]);
else
wprintw (show_pad,".");
if (file_info.offset_in_block==offset+i)
wattrset (show_pad,A_NORMAL);
}
}
wprintw (show_pad," ");
for (i=0;i<16;i++) {
if (file_info.file_offset+offset+i>file_info.file_length-1) break;
if (file_info.offset_in_block==offset+i)
wattrset (show_pad,A_REVERSE);
wprintw (show_pad,"%02x",ch_ptr [i]);
if (file_info.offset_in_block==offset+i) {
wattrset (show_pad,A_NORMAL);
show_pad_info.line=l-l % show_pad_info.display_lines;
}
wprintw (show_pad," ");
}
wprintw (show_pad,"\n");
offset+=i;
ch_ptr+=i;
}
show_pad_info.max_line=l-1;
refresh_show_pad ();
show_status ();
}
void file_show_text (void)
{
long offset=0,last_offset,l=0,cols=0;
unsigned char *ch_ptr;
/* device_offset and type_data points to the inode */
show_pad_info.line=0;
wmove (show_pad,0,0);
ch_ptr=file_info.buffer;
last_offset=file_system_info.block_size-1;
if (file_info.file_offset+last_offset > file_info.file_length-1)
last_offset=file_info.file_length-1-file_info.file_offset;
while ( (offset <= last_offset) && l<SHOW_PAD_LINES) {
if (cols==SHOW_PAD_COLS-1) {
wprintw (show_pad,"\n");
l++;cols=0;
}
if (file_info.offset_in_block==offset)
wattrset (show_pad,A_REVERSE);
if (*ch_ptr >= ' ' && *ch_ptr <= 'z')
wprintw (show_pad,"%c",*ch_ptr);
else {
if (*ch_ptr == 0xa) {
wprintw (show_pad,"\n");
l++;cols=0;
}
else if (*ch_ptr == 0x9)
wprintw (show_pad," ");
else
wprintw (show_pad,".");
}
if (file_info.offset_in_block==offset) {
wattrset (show_pad,A_NORMAL);
show_pad_info.line=l-l % show_pad_info.display_lines;
}
offset++;cols++;ch_ptr++;
}
wprintw (show_pad,"\n");
show_pad_info.max_line=l;
refresh_show_pad ();
show_status ();
}
void show_status (void)
{
long inode_num;
werase (show_win);wmove (show_win,0,0);
wprintw (show_win,"File contents. Block %ld. ",file_info.global_block_num);
wprintw (show_win,"File block %ld of %ld. ",file_info.block_num,file_info.blocks_count-1);
wprintw (show_win,"File Offset %ld of %ld.",file_info.file_offset,file_info.file_length-1);
wmove (show_win,1,0);
inode_num=inode_offset_to_inode_num (file_info.inode_offset);
wprintw (show_win,"File inode %ld. Indirection level %ld.",inode_num,file_info.level);
refresh_show_win ();
}
void type_file___remember (char *command_line)
{
int found=0;
long entry_num;
char *ptr,buffer [80];
struct struct_descriptor *descriptor_ptr;
ptr=parse_word (command_line,buffer);
if (*ptr==0) {
wprintw (command_win,"Error - Argument not specified\n");wrefresh (command_win);
return;
}
ptr=parse_word (ptr,buffer);
entry_num=remember_lifo.entries_count++;
if (entry_num>REMEMBER_COUNT-1) {
entry_num=0;
remember_lifo.entries_count--;
}
descriptor_ptr=first_type;
while (descriptor_ptr!=NULL && !found) {
if (strcmp (descriptor_ptr->name,"ext2_inode")==0)
found=1;
else
descriptor_ptr=descriptor_ptr->next;
}
remember_lifo.offset [entry_num]=device_offset;
remember_lifo.type [entry_num]=descriptor_ptr;
strcpy (remember_lifo.name [entry_num],buffer);
wprintw (command_win,"Object %s in Offset %ld remembered as %s\n",descriptor_ptr->name,device_offset,buffer);
wrefresh (command_win);
}
void type_file___set (char *command_line)
{
unsigned char tmp;
char *ptr,buffer [80],*ch_ptr;
int mode=HEX;
ptr=parse_word (command_line,buffer);
if (*ptr==0) {
wprintw (command_win,"Error - Argument not specified\n");refresh_command_win ();return;
}
ptr=parse_word (ptr,buffer);
if (strcasecmp (buffer,"text")==0) {
mode=TEXT;
strcpy (buffer,ptr);
}
else if (strcasecmp (buffer,"hex")==0) {
mode=HEX;
ptr=parse_word (ptr,buffer);
}
if (*buffer==0) {
wprintw (command_win,"Error - Data not specified\n");refresh_command_win ();return;
}
if (mode==HEX) {
do {
tmp=(unsigned char) strtol (buffer,NULL,16);
file_info.buffer [file_info.offset_in_block]=tmp;
file_info.offset_in_block++;
ptr=parse_word (ptr,buffer);
if (file_info.offset_in_block==file_system_info.block_size) {
if (*ptr) {
wprintw (command_win,"Error - Ending offset outside block, only partial string changed\n");
refresh_command_win ();
}
file_info.offset_in_block--;
}
} while (*buffer) ;
}
else {
ch_ptr=buffer;
while (*ch_ptr) {
tmp=(unsigned char) *ch_ptr++;
file_info.buffer [file_info.offset_in_block]=tmp;
file_info.offset_in_block++;
if (file_info.offset_in_block==file_system_info.block_size) {
if (*ch_ptr) {
wprintw (command_win,"Error - Ending offset outside block, only partial string changed\n");
refresh_command_win ();
}
file_info.offset_in_block--;
}
}
}
strcpy (buffer,"show");dispatch (buffer);
}
void type_file___writedata (char *command_line)
{
low_write (file_info.buffer,file_system_info.block_size,file_info.global_block_offset);
return;
}
long file_block_to_global_block (long file_block,struct struct_file_info *file_info_ptr)
{
long last_direct,last_indirect,last_dindirect;
last_direct=EXT2_NDIR_BLOCKS-1;
last_indirect=last_direct+file_system_info.block_size/4;
last_dindirect=last_indirect+(file_system_info.block_size/4)*(file_system_info.block_size/4);
if (file_block <= last_direct) {
file_info_ptr->level=0;
return (file_info_ptr->inode_ptr->i_block [file_block]);
}
if (file_block <= last_indirect) {
file_info_ptr->level=1;
file_block=file_block-last_direct-1;
return (return_indirect (file_info_ptr->inode_ptr->i_block [EXT2_IND_BLOCK],file_block));
}
if (file_block <= last_dindirect) {
file_info_ptr->level=2;
file_block=file_block-last_indirect-1;
return (return_dindirect (file_info_ptr->inode_ptr->i_block [EXT2_DIND_BLOCK],file_block));
}
file_info_ptr->level=3;
file_block=file_block-last_dindirect-1;
return (return_tindirect (file_info_ptr->inode_ptr->i_block [EXT2_TIND_BLOCK],file_block));
}
long return_indirect (long table_block,long block_num)
{
long block_table [EXT2_MAX_BLOCK_SIZE/4];
low_read ((char *) block_table,file_system_info.block_size,table_block*file_system_info.block_size);
return (block_table [block_num]);
}
long return_dindirect (long table_block,long block_num)
{
long f_indirect;
f_indirect=block_num/(file_system_info.block_size/4);
f_indirect=return_indirect (table_block,f_indirect);
return (return_indirect (f_indirect,block_num%(file_system_info.block_size/4)));
}
long return_tindirect (long table_block,long block_num)
{
long s_indirect;
s_indirect=block_num/((file_system_info.block_size/4)*(file_system_info.block_size/4));
s_indirect=return_indirect (table_block,s_indirect);
return (return_dindirect (s_indirect,block_num%((file_system_info.block_size/4)*(file_system_info.block_size/4))));
}