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libisoburn/libisoburn/isofs_wrap.c

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/*
cc -g -c isofs_wrap.c
*/
/*
libisofs related functions of libisoburn.
Copyright 2007 - 2009 Vreixo Formoso Lopes <metalpain2002@yahoo.es>
Thomas Schmitt <scdbackup@gmx.net>
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#ifndef Xorriso_standalonE
#include <libburn/libburn.h>
#include <libisofs/libisofs.h>
#else /* ! Xorriso_standalonE */
#include "../libisofs/libisofs.h"
#include "../libburn/libburn.h"
#endif /* Xorriso_standalonE */
#include "isoburn.h"
#include "libisoburn.h"
#define BP(a,b) [(b) - (a) + 1]
struct ecma119_pri_vol_desc
{
uint8_t vol_desc_type BP(1, 1);
uint8_t std_identifier BP(2, 6);
uint8_t vol_desc_version BP(7, 7);
uint8_t unused1 BP(8, 8);
uint8_t system_id BP(9, 40);
uint8_t volume_id BP(41, 72);
uint8_t unused2 BP(73, 80);
uint8_t vol_space_size BP(81, 88);
uint8_t unused3 BP(89, 120);
uint8_t vol_set_size BP(121, 124);
uint8_t vol_seq_number BP(125, 128);
uint8_t block_size BP(129, 132);
uint8_t path_table_size BP(133, 140);
uint8_t l_path_table_pos BP(141, 144);
uint8_t opt_l_path_table_pos BP(145, 148);
uint8_t m_path_table_pos BP(149, 152);
uint8_t opt_m_path_table_pos BP(153, 156);
uint8_t root_dir_record BP(157, 190);
uint8_t vol_set_id BP(191, 318);
uint8_t publisher_id BP(319, 446);
uint8_t data_prep_id BP(447, 574);
uint8_t application_id BP(575, 702);
uint8_t copyright_file_id BP(703, 739);
uint8_t abstract_file_id BP(740, 776);
uint8_t bibliographic_file_id BP(777, 813);
uint8_t vol_creation_time BP(814, 830);
uint8_t vol_modification_time BP(831, 847);
uint8_t vol_expiration_time BP(848, 864);
uint8_t vol_effective_time BP(865, 881);
uint8_t file_structure_version BP(882, 882);
uint8_t reserved1 BP(883, 883);
uint8_t app_use BP(884, 1395);
uint8_t reserved2 BP(1396, 2048);
};
static
uint32_t iso_read_lsb(const uint8_t *buf, int bytes)
{
int i;
uint32_t ret = 0;
for (i=0; i<bytes; i++) {
ret += ((uint32_t) buf[i]) << (i*8);
}
return ret;
}
/* API function. See libisoburn.h
*/
IsoImage *isoburn_get_attached_image(struct burn_drive *d)
{
int ret;
struct isoburn *o= NULL;
ret = isoburn_find_emulator(&o, d, 0);
if (ret < 0)
return NULL;
if (o == NULL) {
return NULL;
}
iso_image_ref(o->image);
return o->image;
}
static void isoburn_idle_free_function(void *ignored)
{
return;
}
/* API function. See libisoburn.h
*/
int isoburn_read_image(struct burn_drive *d,
struct isoburn_read_opts *read_opts,
IsoImage **image)
{
int ret, int_num, dummy;
IsoReadOpts *ropts= NULL;
IsoReadImageFeatures *features= NULL;
uint32_t ms_block;
char msg[160];
enum burn_disc_status status= BURN_DISC_BLANK;
IsoDataSource *ds= NULL;
struct isoburn *o= NULL;
if(d != NULL) {
ret = isoburn_find_emulator(&o, d, 0);
if (ret < 0 || o == NULL)
return 0;
status = isoburn_disc_get_status(d);
}
if(read_opts==NULL) {
isoburn_msgs_submit(o, 0x00060000,
"Program error: isoburn_read_image: read_opts==NULL",
0, "FATAL", 0);
return(-1);
}
if (d == NULL || status == BURN_DISC_BLANK || read_opts->pretend_blank) {
create_blank_image:;
/*
* Blank disc, we create a new image without files.
*/
if (d == NULL) {
/* New empty image without relation to a drive */
if (image==NULL) {
isoburn_msgs_submit(o, 0x00060000,
"Program error: isoburn_read_image: image==NULL",
0, "FATAL", 0);
return -1;
}
/* create a new image */
ret = iso_image_new("ISOIMAGE", image);
if (ret < 0) {
isoburn_report_iso_error(ret, "Cannot create image", 0, "FATAL", 0);
return ret;
}
} else {
/* Blank new image for the drive */
iso_image_unref(o->image);
ret = iso_image_new("ISOIMAGE", &o->image);
if (ret < 0) {
isoburn_report_iso_error(ret, "Cannot create image", 0, "FATAL", 0);
return ret;
}
if (image) {
*image = o->image;
iso_image_ref(*image); /*protects object from premature free*/
}
}
iso_image_set_ignore_aclea(*image,
(!!(read_opts->noacl)) | ((!!read_opts->noea) << 1) );
return 1;
}
if (status != BURN_DISC_APPENDABLE && status != BURN_DISC_FULL) {
isoburn_msgs_submit(o, 0x00060000,
"Program error: isoburn_read_image: incorrect disc status",
0, "FATAL", 0);
return -4;
}
memset((char *) &ropts, 0, sizeof(ropts));
ret = isoburn_disc_get_msc1(d, &int_num);
if (ret <= 0)
return -2;
ms_block= int_num;
ret = isoburn_read_iso_head(d, int_num, &dummy, NULL, 0);
if (ret <= 0) {
sprintf(msg, "No ISO 9660 image at LBA %d. Creating blank image.", int_num);
isoburn_msgs_submit(o, 0x00060000, msg, 0, "WARNING", 0);
goto create_blank_image;
}
/* create the data source */
ret = iso_read_opts_new(&ropts, 0);
if (ret < 0) {
isoburn_report_iso_error(ret, "Cannot create write opts", 0, "FATAL", 0);
return ret;
}
/* Important: do not return until iso_read_opts_free() */
iso_read_opts_set_start_block(ropts, ms_block);
iso_read_opts_set_no_rockridge(ropts, read_opts->norock);
#ifdef Libisofs_with_aaiP
iso_read_opts_set_no_aaip(ropts, read_opts->noaaip);
#endif /* Libisofs_with_aaiP */
iso_read_opts_set_no_joliet(ropts, read_opts->nojoliet);
iso_read_opts_set_no_iso1999(ropts, read_opts->noiso1999);
iso_read_opts_set_preferjoliet(ropts, read_opts->preferjoliet);
iso_read_opts_set_default_permissions(ropts,
read_opts->mode, read_opts->dirmode);
iso_read_opts_set_default_uid(ropts, read_opts->uid);
iso_read_opts_set_default_gid(ropts, read_opts->gid);
iso_read_opts_set_input_charset(ropts, read_opts->input_charset);
/* <<< experimental API call of libisofs
iso_read_opts_set_error_behavior(ropts, 1);
*/
ds = isoburn_data_source_new(d);
if(o->iso_data_source!=NULL)
iso_data_source_unref(o->iso_data_source);
o->iso_data_source= ds;
iso_image_attach_data(o->image, o->read_pacifier_handle,
isoburn_idle_free_function);
if(o->read_pacifier_handle==NULL)
iso_tree_set_report_callback(o->image, NULL);
else
iso_tree_set_report_callback(o->image, o->read_pacifier);
ret = iso_image_import(o->image, ds, ropts, &features);
iso_tree_set_report_callback(o->image, NULL);
iso_read_opts_free(ropts);
if (ret < 0) {
isoburn_report_iso_error(ret, "Cannot import image", 0, "FAILURE", 0);
return ret;
}
/* Important: do not return until free(features) */
if (image!=NULL) {
*image = o->image;
iso_image_ref(*image); /*protects object from premature free*/
}
read_opts->hasRR = iso_read_image_features_has_rockridge(features);
read_opts->hasJoliet = iso_read_image_features_has_joliet(features);
read_opts->hasIso1999 = iso_read_image_features_has_iso1999(features);
read_opts->hasElTorito = iso_read_image_features_has_eltorito(features);
read_opts->size = iso_read_image_features_get_size(features);
iso_read_image_features_destroy(features);
return 1;
}
/* API function. See libisoburn.h
*/
int isoburn_attach_image(struct burn_drive *d, IsoImage *image)
{
int ret;
struct isoburn *o;
ret = isoburn_find_emulator(&o, d, 0);
if (ret < 0 || o == NULL)
return 0;
if (image == NULL) {
isoburn_msgs_submit(o, 0x00060000,
"Program error: isoburn_attach_image: image==NULL",
0, "FATAL", 0);
return -1;
}
if(o->image != NULL)
iso_image_unref(o->image);
o->image = image;
return(1);
}
/* API function. See libisoburn.h
*/
int isoburn_activate_session(struct burn_drive *drive)
{
int ret;
struct isoburn *o;
ret = isoburn_find_emulator(&o, drive, 0);
if (ret < 0)
return -1;
if (o->emulation_mode != 1)
return 1; /* don't need to activate session */
if (o->fabricated_msc2 >= 0)
return 1; /* blind growing: do not alter anything outside the session */
if (!(o->fabricated_disc_status == BURN_DISC_APPENDABLE ||
(o->fabricated_disc_status == BURN_DISC_BLANK &&
o->zero_nwa > 0)))
return 1;
ret = burn_random_access_write(drive, (off_t) 0, (char*)o->target_iso_head,
Libisoburn_target_head_sizE, 1);
return ret;
}
/** Initialize the emulation of multi-session on random access media.
The need for emulation is confirmed already.
@param o A freshly created isoburn object. isoburn_create_data_source() was
already called, nevertheless.
@return <=0 error , 1 = success
*/
int isoburn_start_emulation(struct isoburn *o, int flag)
{
int ret, i;
off_t data_count;
struct burn_drive *drive;
struct ecma119_pri_vol_desc *pvm;
if(o==NULL) {
isoburn_msgs_submit(NULL, 0x00060000,
"Program error: isoburn_start_emulation: o==NULL",
0, "FATAL", 0);
return -1;
}
drive= o->drive;
/* we can assume 0 as start block for image */
/* TODO what about ms? where we validate valid iso image in ms disc? */
ret = burn_read_data(drive, (off_t) 0, (char*)o->target_iso_head,
(off_t) Libisoburn_target_head_sizE, &data_count, 2);
/* an error means an empty disc */
if (ret <= 0) {
o->fabricated_disc_status= BURN_DISC_BLANK;
return 1;
}
/* check first 64K. If 0's, the disc is treated as a blank disc, and thus
overwritten without extra check. */
i = Libisoburn_target_head_sizE;
while (i && !o->target_iso_head[i-1])
--i;
if (!i) {
o->fabricated_disc_status= BURN_DISC_BLANK;
return 1;
}
pvm = (struct ecma119_pri_vol_desc *)(o->target_iso_head + 16 * 2048);
if (!strncmp((char*)pvm->std_identifier, "CD001", 5)) {
off_t size;
/* sanity check */
if (pvm->vol_desc_type[0] != 1 || pvm->vol_desc_version[0] != 1
|| pvm->file_structure_version[0] != 1 ) {
/* TODO for now I treat this as a full disc */
o->fabricated_disc_status= BURN_DISC_FULL;
return 1;
}
/* ok, PVM found, set size */
size = (off_t) iso_read_lsb(pvm->vol_space_size, 4);
size *= (off_t) 2048; /* block size in bytes */
isoburn_set_start_byte(o, size, 0);
o->fabricated_disc_status= BURN_DISC_APPENDABLE;
} else if (!strncmp((char*)pvm->std_identifier, "CDXX1", 5)) {
/* empty image */
isoburn_set_start_byte(o, o->zero_nwa * 2048, 0);
o->fabricated_disc_status= BURN_DISC_BLANK;
} else {
/* treat any disc in an unknown format as full */
o->fabricated_disc_status= BURN_DISC_FULL;
}
return 1;
}
/** Alters and writes the first 64 kB of a "media" to invalidate
an ISO image. (It shall stay restorable by skilled humans, though).
The result shall especially keep libisoburn from accepting the media
image as ISO filesystem.
@param o A fully activated isoburn object. isoburn_start_emulation()
was already called.
@return <=0 error , 1 = success
*/
int isoburn_invalidate_iso(struct isoburn *o, int flag)
{
/*
* replace CD001 with CDXX1 in PVM.
* I think this is enought for invalidating an iso image
*/
strncpy((char*)o->target_iso_head + 16 * 2048 + 1, "CDXX1", 5);
return isoburn_activate_session(o->drive);
}
/* API @since 0.1.0 */
int isoburn_set_read_pacifier(struct burn_drive *drive,
int (*read_pacifier)(IsoImage*, IsoFileSource*),
void *read_handle)
{
int ret;
struct isoburn *o;
ret = isoburn_find_emulator(&o, drive, 0);
if(ret < 0 || o == NULL)
return -1;
o->read_pacifier_handle= read_handle;
o->read_pacifier= read_pacifier;
return(1);
}
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