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grub/util/mkisofs/rock.c
Robert Millan 6e1e0d8954 2009-11-12 Robert Millan <rmh.grub@aybabtu.com> 
* util/mkisofs/eltorito.c (init_boot_catalog): Handle return code
        of write calls (converting them to fwrite() if they aren't already).
        (get_torito_desc): Likewise.
        * util/mkisofs/rock.c (generate_rock_ridge_attributes): Likewise.
2009-11-12 21:32:47 +00:00

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/*
* File rock.c - generate RRIP records for iso9660 filesystems.
Written by Eric Youngdale (1993).
Copyright 1993 Yggdrasil Computing, Incorporated
Copyright (C) 2009 Free Software Foundation, Inc.
This program 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 3, or (at your option)
any later version.
This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
static char rcsid[] ="$Id: rock.c,v 1.8 1999/03/02 03:41:26 eric Exp $";
#include <stdlib.h>
#include "config.h"
#ifndef VMS
#if defined(MAJOR_IN_SYSMACROS)
#include <sys/sysmacros.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#endif
#if defined(MAJOR_IN_MKDEV)
#include <sys/types.h>
#include <sys/mkdev.h>
#endif
#include "mkisofs.h"
#include "iso9660.h"
#include <string.h>
#include <errno.h>
#ifdef DOESNT_WORK
#ifdef NON_UNIXFS
#define S_ISLNK(m) (0)
#else
#ifndef S_ISLNK
#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
#endif
#endif
#else
#include <statdefs.h>
#endif
#define SU_VERSION 1
#define SL_ROOT 8
#define SL_PARENT 4
#define SL_CURRENT 2
#define SL_CONTINUE 1
#define CE_SIZE 28
#define CL_SIZE 12
#define ER_SIZE 8
#define NM_SIZE 5
#define PL_SIZE 12
#define PN_SIZE 20
#define PX_SIZE 36
#define RE_SIZE 4
#define SL_SIZE 20
#define ZZ_SIZE 15
#ifdef __QNX__
#define TF_SIZE (5 + 4 * 7)
#else
#define TF_SIZE (5 + 3 * 7)
#endif
/* If we need to store this number of bytes, make sure we
do not box ourselves in so that we do not have room for
a CE entry for the continuation record */
#define MAYBE_ADD_CE_ENTRY(BYTES) \
((unsigned) ((BYTES) + CE_SIZE + currlen + ipnt) > (unsigned) (recstart + reclimit) ? 1 : 0)
/*
* Buffer to build RR attributes
*/
static unsigned char Rock[16384];
static unsigned char symlink_buff[256];
static int ipnt = 0;
static int recstart = 0;
static int currlen = 0;
static int mainrec = 0;
static int reclimit;
static void add_CE_entry __PR((void));
static void add_CE_entry(){
if(recstart)
set_733((char*)Rock + recstart - 8, ipnt + 28 - recstart);
Rock[ipnt++] ='C';
Rock[ipnt++] ='E';
Rock[ipnt++] = CE_SIZE;
Rock[ipnt++] = SU_VERSION;
set_733((char*)Rock + ipnt, 0);
ipnt += 8;
set_733((char*)Rock + ipnt, 0);
ipnt += 8;
set_733((char*)Rock + ipnt, 0);
ipnt += 8;
recstart = ipnt;
currlen = 0;
if(!mainrec) mainrec = ipnt;
reclimit = SECTOR_SIZE - 8; /* Limit to one sector */
}
#ifdef __STDC__
int generate_rock_ridge_attributes (char * whole_name, char * name,
struct directory_entry * s_entry,
struct stat * statbuf,
struct stat * lstatbuf,
int deep_opt)
#else
int generate_rock_ridge_attributes (whole_name, name,
s_entry,
statbuf,
lstatbuf,
deep_opt)
char * whole_name; char * name; struct directory_entry * s_entry;
struct stat * statbuf, *lstatbuf;
int deep_opt;
#endif
{
int flagpos, flagval;
int need_ce;
statbuf = statbuf; /* this shuts up unreferenced compiler warnings */
mainrec = recstart = ipnt = 0;
reclimit = 0xf8;
/* no need to fill in the RR stuff if we won't see the file */
if (s_entry->de_flags & INHIBIT_ISO9660_ENTRY)
return 0;
/* Obtain the amount of space that is currently used for the directory
record. Assume max for name, since name conflicts may cause us
to rename the file later on */
currlen = sizeof(s_entry->isorec);
/* Identify that we are using the SUSP protocol */
if(deep_opt & NEED_SP){
Rock[ipnt++] ='S';
Rock[ipnt++] ='P';
Rock[ipnt++] = 7;
Rock[ipnt++] = SU_VERSION;
Rock[ipnt++] = 0xbe;
Rock[ipnt++] = 0xef;
Rock[ipnt++] = 0;
};
/* First build the posix name field */
Rock[ipnt++] ='R';
Rock[ipnt++] ='R';
Rock[ipnt++] = 5;
Rock[ipnt++] = SU_VERSION;
flagpos = ipnt;
flagval = 0;
Rock[ipnt++] = 0; /* We go back and fix this later */
if(strcmp(name,".") && strcmp(name,"..")){
char * npnt;
int remain, use;
remain = strlen(name);
npnt = name;
while(remain){
use = remain;
need_ce = 0;
/* Can we fit this SUSP and a CE entry? */
if(use + currlen + CE_SIZE + (ipnt - recstart) > reclimit) {
use = reclimit - currlen - CE_SIZE - (ipnt - recstart);
need_ce++;
}
/* Only room for 256 per SUSP field */
if(use > 0xf8) use = 0xf8;
/* First build the posix name field */
Rock[ipnt++] ='N';
Rock[ipnt++] ='M';
Rock[ipnt++] = NM_SIZE + use;
Rock[ipnt++] = SU_VERSION;
Rock[ipnt++] = (remain != use ? 1 : 0);
flagval |= (1<<3);
strncpy((char *)&Rock[ipnt], npnt, use);
npnt += use;
ipnt += use;
remain -= use;
if(remain && need_ce) add_CE_entry();
};
};
/*
* Add the posix modes
*/
if(MAYBE_ADD_CE_ENTRY(PX_SIZE)) add_CE_entry();
Rock[ipnt++] ='P';
Rock[ipnt++] ='X';
Rock[ipnt++] = PX_SIZE;
Rock[ipnt++] = SU_VERSION;
flagval |= (1<<0);
set_733((char*)Rock + ipnt, lstatbuf->st_mode);
ipnt += 8;
set_733((char*)Rock + ipnt, lstatbuf->st_nlink);
ipnt += 8;
set_733((char*)Rock + ipnt, lstatbuf->st_uid);
ipnt += 8;
set_733((char*)Rock + ipnt, lstatbuf->st_gid);
ipnt += 8;
/*
* Check for special devices
*/
#ifndef NON_UNIXFS
if (S_ISCHR(lstatbuf->st_mode) || S_ISBLK(lstatbuf->st_mode)) {
if(MAYBE_ADD_CE_ENTRY(PN_SIZE)) add_CE_entry();
Rock[ipnt++] ='P';
Rock[ipnt++] ='N';
Rock[ipnt++] = PN_SIZE;
Rock[ipnt++] = SU_VERSION;
flagval |= (1<<1);
#if defined(MAJOR_IN_SYSMACROS) || defined(MAJOR_IN_MKDEV)
set_733((char*)Rock + ipnt, major(lstatbuf->st_rdev ));
ipnt += 8;
set_733((char*)Rock + ipnt, minor(lstatbuf->st_rdev));
ipnt += 8;
#else
/*
* If we don't have sysmacros.h, then we have to guess as to how
* best to pick apart the device number for major/minor.
* Note: this may very well be wrong for many systems, so
* it is always best to use the major/minor macros if the
* system supports it.
*/
if(sizeof(dev_t) <= 2) {
set_733((char*)Rock + ipnt, (lstatbuf->st_rdev >> 8));
ipnt += 8;
set_733((char*)Rock + ipnt, lstatbuf->st_rdev & 0xff);
ipnt += 8;
}
else if(sizeof(dev_t) <= 4) {
set_733((char*)Rock + ipnt, (lstatbuf->st_rdev >> 8) >> 8);
ipnt += 8;
set_733((char*)Rock + ipnt, lstatbuf->st_rdev & 0xffff);
ipnt += 8;
}
else {
set_733((char*)Rock + ipnt, (lstatbuf->st_rdev >> 16) >> 16);
ipnt += 8;
set_733((char*)Rock + ipnt, lstatbuf->st_rdev);
ipnt += 8;
}
#endif
};
#endif
/*
* Check for and symbolic links. VMS does not have these.
*/
if (S_ISLNK(lstatbuf->st_mode)){
int lenpos, lenval, j0, j1;
int nchar;
unsigned char * cpnt, *cpnt1;
nchar = readlink(whole_name, (char *)symlink_buff, sizeof(symlink_buff));
symlink_buff[nchar < 0 ? 0 : nchar] = 0;
nchar = strlen((char *) symlink_buff);
set_733(s_entry->isorec.size, 0);
cpnt = &symlink_buff[0];
flagval |= (1<<2);
if (! split_SL_field)
{
int sl_bytes = 0;
for (cpnt1 = cpnt; *cpnt1 != '\0'; cpnt1++)
{
if (*cpnt1 == '/')
{
sl_bytes += 4;
}
else
{
sl_bytes += 1;
}
}
if (sl_bytes > 250)
{
/*
* the symbolic link won't fit into one SL System Use Field
* print an error message and continue with splited one
*/
fprintf(stderr,"symbolic link ``%s'' to long for one SL System Use Field, splitting", cpnt);
}
if(MAYBE_ADD_CE_ENTRY(SL_SIZE + sl_bytes)) add_CE_entry();
}
while(nchar){
if(MAYBE_ADD_CE_ENTRY(SL_SIZE)) add_CE_entry();
Rock[ipnt++] ='S';
Rock[ipnt++] ='L';
lenpos = ipnt;
Rock[ipnt++] = SL_SIZE;
Rock[ipnt++] = SU_VERSION;
Rock[ipnt++] = 0; /* Flags */
lenval = 5;
while(*cpnt){
cpnt1 = (unsigned char *) strchr((char *) cpnt, '/');
if(cpnt1) {
nchar--;
*cpnt1 = 0;
};
/* We treat certain components in a special way. */
if(cpnt[0] == '.' && cpnt[1] == '.' && cpnt[2] == 0){
if(MAYBE_ADD_CE_ENTRY(2)) add_CE_entry();
Rock[ipnt++] = SL_PARENT;
Rock[ipnt++] = 0; /* length is zero */
lenval += 2;
nchar -= 2;
} else if(cpnt[0] == '.' && cpnt[1] == 0){
if(MAYBE_ADD_CE_ENTRY(2)) add_CE_entry();
Rock[ipnt++] = SL_CURRENT;
Rock[ipnt++] = 0; /* length is zero */
lenval += 2;
nchar -= 1;
} else if(cpnt[0] == 0){
if(MAYBE_ADD_CE_ENTRY(2)) add_CE_entry();
Rock[ipnt++] = SL_ROOT;
Rock[ipnt++] = 0; /* length is zero */
lenval += 2;
} else {
/* If we do not have enough room for a component, start
a new continuations segment now */
if(split_SL_component ? MAYBE_ADD_CE_ENTRY(6) :
MAYBE_ADD_CE_ENTRY(6 + strlen ((char *) cpnt)))
{
add_CE_entry();
if(cpnt1)
{
*cpnt1 = '/';
nchar++;
cpnt1 = NULL; /* A kluge so that we can restart properly */
}
break;
}
j0 = strlen((char *) cpnt);
while(j0) {
j1 = j0;
if(j1 > 0xf8) j1 = 0xf8;
need_ce = 0;
if(j1 + currlen + CE_SIZE + (ipnt - recstart) > reclimit) {
j1 = reclimit - currlen - CE_SIZE - (ipnt - recstart);
need_ce++;
}
Rock[ipnt++] = (j1 != j0 ? SL_CONTINUE : 0);
Rock[ipnt++] = j1;
strncpy((char *) Rock + ipnt, (char *) cpnt, j1);
ipnt += j1;
lenval += j1 + 2;
cpnt += j1;
nchar -= j1; /* Number we processed this time */
j0 -= j1;
if(need_ce) {
add_CE_entry();
if(cpnt1) {
*cpnt1 = '/';
nchar++;
cpnt1 = NULL; /* A kluge so that we can restart properly */
}
break;
}
}
};
if(cpnt1) {
cpnt = cpnt1 + 1;
} else
break;
}
Rock[lenpos] = lenval;
if(nchar) Rock[lenpos + 2] = SL_CONTINUE; /* We need another SL entry */
} /* while nchar */
} /* Is a symbolic link */
/*
* Add in the Rock Ridge TF time field
*/
if(MAYBE_ADD_CE_ENTRY(TF_SIZE)) add_CE_entry();
Rock[ipnt++] ='T';
Rock[ipnt++] ='F';
Rock[ipnt++] = TF_SIZE;
Rock[ipnt++] = SU_VERSION;
#ifdef __QNX__
Rock[ipnt++] = 0x0f;
#else
Rock[ipnt++] = 0x0e;
#endif
flagval |= (1<<7);
#ifdef __QNX__
iso9660_date((char *) &Rock[ipnt], lstatbuf->st_ftime);
ipnt += 7;
#endif
iso9660_date((char *) &Rock[ipnt], lstatbuf->st_mtime);
ipnt += 7;
iso9660_date((char *) &Rock[ipnt], lstatbuf->st_atime);
ipnt += 7;
iso9660_date((char *) &Rock[ipnt], lstatbuf->st_ctime);
ipnt += 7;
/*
* Add in the Rock Ridge RE time field
*/
if(deep_opt & NEED_RE){
if(MAYBE_ADD_CE_ENTRY(RE_SIZE)) add_CE_entry();
Rock[ipnt++] ='R';
Rock[ipnt++] ='E';
Rock[ipnt++] = RE_SIZE;
Rock[ipnt++] = SU_VERSION;
flagval |= (1<<6);
};
/*
* Add in the Rock Ridge PL record, if required.
*/
if(deep_opt & NEED_PL){
if(MAYBE_ADD_CE_ENTRY(PL_SIZE)) add_CE_entry();
Rock[ipnt++] ='P';
Rock[ipnt++] ='L';
Rock[ipnt++] = PL_SIZE;
Rock[ipnt++] = SU_VERSION;
set_733((char*)Rock + ipnt, 0);
ipnt += 8;
flagval |= (1<<5);
};
/*
* Add in the Rock Ridge CL field, if required.
*/
if(deep_opt & NEED_CL){
if(MAYBE_ADD_CE_ENTRY(CL_SIZE)) add_CE_entry();
Rock[ipnt++] ='C';
Rock[ipnt++] ='L';
Rock[ipnt++] = CL_SIZE;
Rock[ipnt++] = SU_VERSION;
set_733((char*)Rock + ipnt, 0);
ipnt += 8;
flagval |= (1<<4);
};
#ifndef VMS
/* If transparent compression was requested, fill in the correct
field for this file */
if(transparent_compression &&
S_ISREG(lstatbuf->st_mode) &&
strlen(name) > 3 &&
strcmp(name + strlen(name) - 3,".gZ") == 0){
FILE * zipfile;
char * checkname;
unsigned int file_size;
unsigned char header[8];
int OK_flag;
/* First open file and verify that the correct algorithm was used */
file_size = 0;
OK_flag = 1;
zipfile = fopen(whole_name, "rb");
if (fread (header, 1, sizeof (header), zipfile) != sizeof(header))
error (1, errno, "fread");
/* Check some magic numbers from gzip. */
if(header[0] != 0x1f || header[1] != 0x8b || header[2] != 8) OK_flag = 0;
/* Make sure file was blocksized. */
if(((header[3] & 0x40) == 0)) OK_flag = 0;
/* OK, now go to the end of the file and get some more info */
if(OK_flag){
int status;
status = (long)lseek(fileno(zipfile), (off_t)(-8), SEEK_END);
if(status == -1) OK_flag = 0;
}
if(OK_flag){
if(read(fileno(zipfile), (char*)header, sizeof(header)) != sizeof(header))
OK_flag = 0;
else {
int blocksize;
blocksize = (header[3] << 8) | header[2];
file_size = ((unsigned int)header[7] << 24) |
((unsigned int)header[6] << 16) |
((unsigned int)header[5] << 8) | header[4];
#if 0
fprintf(stderr,"Blocksize = %d %d\n", blocksize, file_size);
#endif
if(blocksize != SECTOR_SIZE) OK_flag = 0;
}
}
fclose(zipfile);
checkname = strdup(whole_name);
checkname[strlen(whole_name)-3] = 0;
zipfile = fopen(checkname, "rb");
if(zipfile) {
OK_flag = 0;
fprintf(stderr,"Unable to insert transparent compressed file - name conflict\n");
fclose(zipfile);
}
free(checkname);
if(OK_flag){
if(MAYBE_ADD_CE_ENTRY(ZZ_SIZE)) add_CE_entry();
Rock[ipnt++] ='Z';
Rock[ipnt++] ='Z';
Rock[ipnt++] = ZZ_SIZE;
Rock[ipnt++] = SU_VERSION;
Rock[ipnt++] = 'g'; /* Identify compression technique used */
Rock[ipnt++] = 'z';
Rock[ipnt++] = 3;
set_733((char*)Rock + ipnt, file_size); /* Real file size */
ipnt += 8;
};
}
#endif
/*
* Add in the Rock Ridge CE field, if required. We use this for the
* extension record that is stored in the root directory.
*/
if(deep_opt & NEED_CE) add_CE_entry();
/*
* Done filling in all of the fields. Now copy it back to a buffer for the
* file in question.
*/
/* Now copy this back to the buffer for the file */
Rock[flagpos] = flagval;
/* If there was a CE, fill in the size field */
if(recstart)
set_733((char*)Rock + recstart - 8, ipnt - recstart);
s_entry->rr_attributes = (unsigned char *) e_malloc(ipnt);
s_entry->total_rr_attr_size = ipnt;
s_entry->rr_attr_size = (mainrec ? mainrec : ipnt);
memcpy(s_entry->rr_attributes, Rock, ipnt);
return ipnt;
}
/* Guaranteed to return a single sector with the relevant info */
char * FDECL4(generate_rr_extension_record, char *, id, char *, descriptor,
char *, source, int *, size){
int lipnt = 0;
char * pnt;
int len_id, len_des, len_src;
len_id = strlen(id);
len_des = strlen(descriptor);
len_src = strlen(source);
Rock[lipnt++] ='E';
Rock[lipnt++] ='R';
Rock[lipnt++] = ER_SIZE + len_id + len_des + len_src;
Rock[lipnt++] = 1;
Rock[lipnt++] = len_id;
Rock[lipnt++] = len_des;
Rock[lipnt++] = len_src;
Rock[lipnt++] = 1;
memcpy(Rock + lipnt, id, len_id);
lipnt += len_id;
memcpy(Rock + lipnt, descriptor, len_des);
lipnt += len_des;
memcpy(Rock + lipnt, source, len_src);
lipnt += len_src;
if(lipnt > SECTOR_SIZE) {
fprintf(stderr,"Extension record too long\n");
exit(1);
};
pnt = (char *) e_malloc(SECTOR_SIZE);
memset(pnt, 0, SECTOR_SIZE);
memcpy(pnt, Rock, lipnt);
*size = lipnt;
return pnt;
}
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