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/* This is part of um-ViewOS
* The user-mode implementation of OSVIEW -- A Process with a View
*
* fuse/umfuse module for iso9660 filesystem support
*
* Copyright 2005,2006,2007 Renzo Davoli University of Bologna - Italy
*
* 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 2 of the License
*
* 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, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Id: fuseiso9660.c 1083 2012-06-24 17:00:09Z rd235 $
*
*/
#if 0
#ifdef linux
/* For pread()/pwrite() */
#define _XOPEN_SOURCE 500
#endif
#endif
#include <config.h>
#include <fuse.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <zlib.h>
#include <dirent.h>
#include <libgen.h>
#include <errno.h>
#include <sys/statvfs.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <cdio/iso9660.h>
#include <cdio/logging.h>
#include "zisofs.h"
#include <v2fuseutils.h>
#ifdef HAVE_SETXATTR
#include <sys/xattr.h>
#endif
#define BRUTECACHETEST
#ifdef BRUTECACHETEST
#define BRUTECACHESIZE 128
#include <time.h>
struct brutecache {
iso9660_t *isofs;
char *path;
struct stat *stat;
time_t time;
} brutecache[BRUTECACHESIZE];
static void brutecache_add(iso9660_t *isofs,const char *path,struct stat *stat)
{
int i,newi;
time_t min,now;
now=min=time(NULL);
for (newi=i=0;i<BRUTECACHESIZE;i++) {
if (brutecache[i].path == NULL)
break;
if (brutecache[i].time < min) {
min=brutecache[i].time;
newi=i;
}
}
if (i < BRUTECACHESIZE) newi=i;
if (brutecache[newi].path != NULL)
free(brutecache[newi].path);
brutecache[newi].path=strdup(path);
brutecache[newi].isofs=isofs;
if (stat==NULL) {
if (brutecache[newi].stat != NULL) {
free(brutecache[newi].stat);
brutecache[newi].stat=NULL;
}
} else {
if (brutecache[newi].stat == NULL)
brutecache[newi].stat = malloc(sizeof(struct stat));
*(brutecache[newi].stat) = *stat;
}
brutecache[newi].time=now;
}
static int brutecache_search(iso9660_t *isofs,const char *path,struct stat *stat)
{
int i;
for (i=0;i<BRUTECACHESIZE;i++) {
if (brutecache[i].isofs == isofs &&
strcmp(brutecache[i].path,path)==0) {
brutecache[i].time=time(NULL);
if (brutecache[i].stat != NULL) {
*stat=*(brutecache[i].stat);
return 0;
} else
return -ENOENT;
}
}
return EAGAIN; /*positive, go on searching */
}
static void brutecache_rmiso(iso9660_t *isofs)
{
int i;
for (i=0;i<BRUTECACHESIZE;i++) {
if (brutecache[i].isofs == isofs) {
if (brutecache[i].path != NULL) {
free(brutecache[i].path);
brutecache[i].path=NULL;
}
if (brutecache[i].stat != NULL) {
free(brutecache[i].stat);
brutecache[i].stat=NULL;
}
}
}
}
#endif
static int f_iso9660_readlink(const char *path, char *buf, size_t size)
{
struct fuse_context *mycontext=fuse_get_context();
iso9660_t *isofs=(iso9660_t *) mycontext->private_data;
iso9660_stat_t *isostat;
isostat= iso9660_ifs_stat(isofs,path);
if (isostat->rr.b3_rock == yep &&
S_ISLNK(isostat->rr.st_mode)) {
if (isostat->rr.i_symlink < size) {
size=isostat->rr.i_symlink;
strncpy(buf,isostat->rr.psz_symlink,size);
buf[size]='\0';
} else
strncpy(buf,isostat->rr.psz_symlink,size);
free(isostat);
return 0;
} else {
free(isostat);
return -EINVAL;
}
}
static int f_iso9660_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi)
{
struct fuse_context *mycontext=fuse_get_context();
iso9660_t *isofs=(iso9660_t *) mycontext->private_data;
//printf("f_iso9660_readdir %s\n",path);
iso9660_stat_t *isostat=
//iso9660_ifs_stat_translate(isofs,path);
iso9660_ifs_stat(isofs,path);
//printf("f_iso9660_getdir %s stat done\n",path);
if (isostat ==NULL)
return -ENOENT;
else {
CdioList_t *entlist;
CdioListNode_t *entnode;
//printf("f_iso9660_readdir %s\n",path);
entlist = iso9660_ifs_readdir (isofs, path);
//printf("f_iso9660_readdir %s done\n",path);
if (entlist != NULL) {
_CDIO_LIST_FOREACH (entnode, entlist)
{
char filename[4096];
int type;
iso9660_stat_t *p_statbuf = _cdio_list_node_data (entnode);
//printf("f_iso9660_translate %s %s\n",p_statbuf->filename,p_statbuf->rr.psz_symlink);
//iso9660_name_translate(p_statbuf->filename, filename);
//iso9660_name_translate_ext(p_statbuf->filename, filename, iso9660_ifs_get_joliet_level(isofs));
strcpy(filename,p_statbuf->filename);
//printf("f_iso9660_translate %s done\n",path);
//printf ("/%s\n", filename);
switch (p_statbuf->type) {
case _STAT_FILE: type=DT_REG;break;
case _STAT_DIR: type=DT_DIR;break;
}
struct stat st;
memset(&st, 0, sizeof(st));
st.st_ino=2;
st.st_mode=type<<12;
//printf("filler %s %d\n",filename,type);
if (filler(buf, filename, &st, 0))
break;
}
_cdio_list_free (entlist, true, NULL);
}
}
free(isostat);
return 0;
}
/*************** COMPRESSED ISO (ZISO) DEFS ***************/
static const unsigned char zisofs_magic[8] = {
0x37, 0xE4, 0x53, 0x96, 0xC9, 0xDB, 0xD6, 0x07
};
static unsigned int get_731(void *pnt)
{
unsigned char *p = (unsigned char *)pnt;
return ((unsigned int)p[0]) + ((unsigned int)p[1] << 8) +
((unsigned int)p[2] << 16) + ((unsigned int)p[3] << 24);
}
/***************************************************************/
struct iso9660fileinfo {
iso9660_stat_t *stat;
unsigned long fullsize;
unsigned char block_shift;
unsigned char *pointer_block;
};
static int f_iso9660_intread(iso9660_t *isofs,iso9660_stat_t *isostat,char *buf, size_t size, off_t offset)
{
off_t firstblock=offset/ISO_BLOCKSIZE;
off_t lastblock;
//printf("INTREAD %ld %lld\n",size,offset);
int readrv=1;
off_t bytesread=0;
if (offset+size > isostat->size)
size= isostat->size - offset;
lastblock=(offset+size)/ISO_BLOCKSIZE;
char cdbuf[ISO_BLOCKSIZE];
memset (cdbuf, 0, ISO_BLOCKSIZE);
offset -= firstblock*ISO_BLOCKSIZE;
while (size > 0 && readrv > 0) {
//printf("f_iso9660_read seek/read \n");
readrv=iso9660_iso_seek_read(isofs, cdbuf,
isostat->lsn+firstblock,1);
//printf("f_iso9660_read seek/read done %lld %lld %lld\n",firstblock,offset,isostat->lsn+firstblock);
if (readrv>0) {
off_t len=(ISO_BLOCKSIZE-offset < size)?ISO_BLOCKSIZE-offset:size;
memcpy(buf,cdbuf+offset,len);
offset=0;
size-=len;
buf+=len;
bytesread+=len;
firstblock++;
}
}
return bytesread;
}
static mode_t convertmode(mode_t nonxamode,uint16_t xaattr)
{
mode_t rv=0;
nonxamode &= 0777;
rv |= (xaattr & 0x5000) >> 12; /* others */
rv |= (xaattr & 0x500) >> 5; /* group */
rv |= (xaattr & 0x50) << 2 ; /* user */
if (xaattr & XA_ATTR_DIRECTORY)
rv |= __S_IFDIR;
else
rv |= __S_IFDIR;
//printf(" MODE CONV %x %o\n",xaattr,rv);
return rv;
}
#if ( FUSE_MINOR_VERSION >= 5 )
static int f_iso9660_statfs(const char *path, struct statvfs *stbuf)
{
int res;
struct fuse_context *mycontext=fuse_get_context();
iso9660_t *isofs=(iso9660_t *) mycontext->private_data;
static iso9660_pvd_t pvd;
/* XXX pvd seems to contain trash in the MS part if its fields */
if (iso9660_ifs_read_pvd (isofs, &pvd)) {
memset(stbuf, 0, sizeof(struct statvfs));
stbuf->f_bsize=pvd.logical_block_size & 0xffff;
stbuf->f_frsize=stbuf->f_bsize;
stbuf->f_blocks=pvd.volume_space_size & 0xffffffff;
/*fprintf(stderr,"STATFS! %p %ld %lx %lld %llx\n",isofs,
pvd.logical_block_size, pvd.logical_block_size,
pvd.volume_space_size, pvd.volume_space_size);*/
return 0;
} else
return -EINVAL;
}
#endif
static int f_iso9660_getattr(const char *path, struct stat *stbuf)
{
struct fuse_context *mycontext=fuse_get_context();
iso9660_t *isofs=(iso9660_t *) mycontext->private_data;
#ifdef BRUTECACHETEST
{
int rv=brutecache_search(isofs,path,stbuf);
if (rv <= 0)
return rv;
}
#endif
//printf("f_iso9660_getattr %p %s\n",isofs,path);
iso9660_stat_t *isostat=
//iso9660_ifs_stat_translate(isofs,path);
iso9660_ifs_stat(isofs,path);
if (isostat ==NULL) {
#ifdef BRUTECACHETEST
brutecache_add(isofs,path,NULL);
#endif
return -ENOENT;
} else {
memset (stbuf,0,sizeof(struct stat));
/* XXX workaround
* should be unique and != existing devices */
stbuf->st_dev=(dev_t) ((long)isofs);
switch (isostat->type) {
case _STAT_FILE:
stbuf->st_mode=__S_IFREG|0555;break;
case _STAT_DIR:
stbuf->st_mode=__S_IFDIR|0555;break;
}
stbuf->st_nlink=1;
stbuf->st_uid=0;
stbuf->st_gid=0;
stbuf->st_rdev=0;
stbuf->st_size=isostat->size;
stbuf->st_ino=isostat->lsn;
//fprintf(stderr,"%s-> lsn %d xa?%d rr?%d\n",path,isostat->lsn,iso9660_ifs_is_xa(isofs),isostat->rr.b3_rock == yep);
if (isostat->rr.b3_rock == yep) {
stbuf->st_mode=isostat->rr.st_mode;
stbuf->st_nlink=isostat->rr.st_nlinks;
stbuf->st_uid=isostat->rr.st_uid;
stbuf->st_gid=isostat->rr.st_gid;
if (isostat->rr.i_symlink > 0) {
stbuf->st_size=isostat->rr.i_symlink;
}
} else
/* XA permission management already untested */
if (iso9660_ifs_is_xa(isofs)) {
stbuf->st_uid=isostat->xa.user_id;
stbuf->st_gid=isostat->xa.group_id;
stbuf->st_ino=isostat->xa.filenum;
stbuf->st_mode=convertmode(stbuf->st_mode,isostat->xa.attributes);
}
/* check it is a reg file? */
if (isostat->size >= sizeof(struct compressed_file_header)) { /* file shorted than the header cannot be compressed */
struct compressed_file_header hdr;
int rv;
rv=f_iso9660_intread(isofs,isostat,(char *)&hdr,sizeof(hdr),0);
if (rv == sizeof(hdr)) {
if (memcmp(hdr.magic,zisofs_magic,sizeof(zisofs_magic))==0)
stbuf->st_size=get_731(hdr.uncompressed_len);
}
}
stbuf->st_blksize=ISO_BLOCKSIZE;
stbuf->st_blocks=isostat->secsize;
stbuf->st_atime= stbuf->st_mtime= stbuf->st_ctime=mktime(&isostat->tm);
//char filename[4096];
//iso9660_name_translate(isostat->filename, filename);
//iso9660_name_translate_ext(isostat->filename, filename, iso9660_ifs_get_joliet_level(isofs));
//strcpy(filename,isostat->filename);
//printf("f_iso9660_getattr OKAY %s\n",filename);
#ifdef BRUTECACHETEST
brutecache_add(isofs,path,stbuf);
#endif
free(isostat);
return 0;
}
}
static int f_iso9660_open(const char *path, struct fuse_file_info *fi)
{
struct fuse_context *mycontext=fuse_get_context();
iso9660_t *isofs=(iso9660_t *) mycontext->private_data;
iso9660_stat_t *isostat=
iso9660_ifs_stat(isofs,path);
//printf("f_iso9660_open %s stat done\n",path);
fi->fh=(unsigned long)NULL;
if (isostat ==NULL)
return -ENOENT;
else {
struct iso9660fileinfo *fh9660=malloc(sizeof (struct iso9660fileinfo));
if (fh9660==NULL)
return -ENOMEM;
fh9660->stat=isostat;
fh9660->pointer_block=NULL;
fh9660->fullsize=isostat->size;
fh9660->block_shift=0;
fi->fh = (unsigned long) fh9660;
if (fh9660->fullsize >= sizeof(struct compressed_file_header)) { /* file shorted than the header cannot be compressed */
struct compressed_file_header hdr;
int rv;
rv=f_iso9660_intread(isofs,isostat,(char *)&hdr,sizeof(hdr),0);
if (rv == sizeof(hdr)) {
if (memcmp(hdr.magic,zisofs_magic,sizeof(zisofs_magic))==0) {
unsigned nblocks;
size_t tablesize;
fh9660->fullsize=get_731(hdr.uncompressed_len);
fh9660->block_shift=hdr.block_size;
nblocks=(fh9660->fullsize+(1<<hdr.block_size)-1) >> hdr.block_size;
tablesize=(nblocks+1) * 4;
if ((fh9660->pointer_block=malloc(tablesize)) ==NULL)
{
free(fh9660);
free(isostat);
return -ENOMEM;
}
if (f_iso9660_intread(isofs,isostat,(char *)fh9660->pointer_block,tablesize,hdr.header_size<<2) != tablesize) {
free(fh9660);
free(isostat);
return -EIO;
}
}
}
}
return 0;
}
}
static int f_iso9660_comprread(iso9660_t *isofs,struct iso9660fileinfo *fh9660,char *buf, size_t size, off_t offset)
{
off_t firstblock=offset>>fh9660->block_shift;
off_t lastblock;
unsigned long readrv=1;
off_t bytesread=0;
if (offset+size > fh9660->fullsize)
size= fh9660->fullsize - offset;
lastblock=(offset+size)>>fh9660->block_shift;
unsigned char *outbuf=malloc(1<<fh9660->block_shift);
if (outbuf == NULL)
return -ENOMEM;
unsigned char *inbuf=malloc((1<<fh9660->block_shift)*2);
if (inbuf == NULL) {
free(outbuf);
return -ENOMEM;
}
offset -= firstblock<<fh9660->block_shift;
while (size > 0 && readrv > 0) {
unsigned long cstart,cend,csize;
cstart=get_731(fh9660->pointer_block+(4*firstblock));
cend=get_731(fh9660->pointer_block+(4*(firstblock+1)));
csize=cend-cstart;
readrv=1<<fh9660->block_shift;
if ((f_iso9660_intread(isofs,fh9660->stat,(char *)inbuf,csize,cstart) != csize) ||
(uncompress(outbuf,&readrv,inbuf,csize) != Z_OK)) {
free(inbuf);
free(outbuf);
return -EIO;
}
if (readrv>0) {
off_t len=((1<<fh9660->block_shift)-offset < size)?(1<<fh9660->block_shift)-offset:size;
memmove(buf,outbuf+offset,len);
offset=0;
size-=len;
buf+=len;
bytesread+=len;
firstblock++;
}
}
free(inbuf);
free(outbuf);
return bytesread;
}
static int f_iso9660_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info *fi)
{
//printf("f_iso9660_read %s\n",path);
struct fuse_context *mycontext=fuse_get_context();
iso9660_t *isofs=(iso9660_t *) mycontext->private_data;
#if 0
iso9660_stat_t *isostat=
iso9660_ifs_stat(isofs,path);
//printf("f_iso9660_read %s stat done\n",path);
if (isostat ==NULL)
return -ENOENT;
else
#endif
{
struct iso9660fileinfo *fh9660=(struct iso9660fileinfo *)((long)(fi->fh));
if (fh9660 ==NULL)
return -ENOENT;
if (fh9660->pointer_block == NULL) /* UNCOMPRESSED ISO */
return f_iso9660_intread(isofs,fh9660->stat,buf,size,offset);
else
return f_iso9660_comprread(isofs,fh9660,buf,size,offset);
}
}
static int f_iso9660_release(const char *path, struct fuse_file_info *fi)
{
struct iso9660fileinfo *fh9660=(struct iso9660fileinfo *)((long)(fi->fh));
free(fh9660->stat);
if (fh9660 != NULL) {
if (fh9660->pointer_block != NULL)
free(fh9660->pointer_block);
free(fh9660);
}
return 0;
}
/* waiting for FUSE 2.6 */
#if ( FUSE_MINOR_VERSION <= 5 )
static void *init_data;
void *f_iso9660_init(void)
{
return init_data;
}
#else
void *f_iso9660_init(struct fuse_conn_info *conn)
{
struct fuse_context *mycontext;
mycontext=fuse_get_context();
//printf("INIT %p %p\n",mycontext,mycontext->private_data);
return mycontext->private_data;
}
#endif
void f_iso9660_destroy(void *arg)
{
iso9660_t *isofs=arg;
#ifdef BRUTECACHETEST
brutecache_rmiso(isofs);
#endif
}
static struct fuse_operations iso9660_oper = {
.getattr = f_iso9660_getattr,
.readlink = f_iso9660_readlink,
#if ( FUSE_MINOR_VERSION >= 5 )
.statfs = f_iso9660_statfs,
#endif
.readdir = f_iso9660_readdir,
.open = f_iso9660_open,
.read = f_iso9660_read,
.release = f_iso9660_release,
.init = f_iso9660_init,
.destroy = f_iso9660_destroy
};
struct fuse *fuse;
#if ( FUSE_MINOR_VERSION <= 5 )
int fuse_fd;
#else
struct fuse_chan *fuse_fd;
#endif
int main(int argc, char *argv[])
{
int err;
struct fuse_context *mycontext;
iso9660_t *isofs;
int i;
if (argc < 3)
v2f_usage(argv[0],&iso9660_oper);
v2f_rearrangeargv(argc,argv);
//isofs=iso9660_open_ext(argv[argc-2],ISO_EXTENSION_ALL);
isofs=iso9660_open_ext(argv[1],ISO_EXTENSION_ALL);
if (!isofs)
return -1;
//printf("open %s %p\n",argv[argc-2],isofs);
if (!iso9660_ifs_read_superblock(isofs,ISO_EXTENSION_ALL))
return -1;
cdio_loglevel_default=CDIO_LOG_ERROR;
/* ADD -s: libiso9660 and our brute cache are not thread safe */
for (i=0; i<argc-1; i++)
argv[i]=argv[i+1];
argv[i]="-s";
#if ( FUSE_MINOR_VERSION <= 5 )
init_data=isofs;
err=fuse_main(argc,argv,&iso9660_oper);
#else
err=fuse_main(argc,argv,&iso9660_oper,isofs);
#endif
iso9660_close(isofs);
return err;
}
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