276 lines
7.0 KiB
C
276 lines
7.0 KiB
C
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/*
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cc -g -c isofs_wrap.c
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*/
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/*
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libisofs related functions of libisoburn.
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Copyright 2007 Vreixo Formoso Lopes <metalpain2002@yahoo.es>
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <libburn/libburn.h>
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#include <libisofs/libisofs.h>
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#include "isoburn.h"
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#include "libisoburn.h"
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#define BP(a,b) [(b) - (a) + 1]
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struct ecma119_pri_vol_desc
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{
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uint8_t vol_desc_type BP(1, 1);
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uint8_t std_identifier BP(2, 6);
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uint8_t vol_desc_version BP(7, 7);
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uint8_t unused1 BP(8, 8);
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uint8_t system_id BP(9, 40);
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uint8_t volume_id BP(41, 72);
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uint8_t unused2 BP(73, 80);
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uint8_t vol_space_size BP(81, 88);
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uint8_t unused3 BP(89, 120);
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uint8_t vol_set_size BP(121, 124);
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uint8_t vol_seq_number BP(125, 128);
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uint8_t block_size BP(129, 132);
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uint8_t path_table_size BP(133, 140);
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uint8_t l_path_table_pos BP(141, 144);
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uint8_t opt_l_path_table_pos BP(145, 148);
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uint8_t m_path_table_pos BP(149, 152);
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uint8_t opt_m_path_table_pos BP(153, 156);
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uint8_t root_dir_record BP(157, 190);
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uint8_t vol_set_id BP(191, 318);
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uint8_t publisher_id BP(319, 446);
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uint8_t data_prep_id BP(447, 574);
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uint8_t application_id BP(575, 702);
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uint8_t copyright_file_id BP(703, 739);
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uint8_t abstract_file_id BP(740, 776);
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uint8_t bibliographic_file_id BP(777, 813);
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uint8_t vol_creation_time BP(814, 830);
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uint8_t vol_modification_time BP(831, 847);
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uint8_t vol_expiration_time BP(848, 864);
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uint8_t vol_effective_time BP(865, 881);
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uint8_t file_structure_version BP(882, 882);
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uint8_t reserved1 BP(883, 883);
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uint8_t app_use BP(884, 1395);
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uint8_t reserved2 BP(1396, 2048);
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};
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static
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uint32_t iso_read_lsb(const uint8_t *buf, int bytes)
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{
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int i;
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uint32_t ret = 0;
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for (i=0; i<bytes; i++) {
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ret += ((uint32_t) buf[i]) << (i*8);
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}
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return ret;
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}
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/* API function. See libisoburn.h
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*/
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int isoburn_read_volset(struct burn_drive *d, struct isoburn_read_opts *read_opts,
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struct iso_volset **volset)
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{
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int ret;
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struct ecma119_read_opts ropts;
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struct isoburn *o;
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assert(d && read_opts && volset);
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ret = isoburn_find_emulator(&o, d, 0);
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if (ret < 0)
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return 0;
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if (!o) {
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return -1;
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}
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if (o->fabricated_disc_status == BURN_DISC_BLANK) {
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// FIXME construct an empty volset!!
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*volset = NULL;
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return 1;
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}
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ret = isoburn_disc_get_msc1(d, (int*) &ropts.block);
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if (ret < 0)
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return -2;
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ropts.norock = read_opts->norock;
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ropts.nojoliet = read_opts->nojoliet;
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ropts.preferjoliet = read_opts->preferjoliet;
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ropts.mode = read_opts->mode;
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ropts.uid = read_opts->uid;
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ropts.gid = read_opts->gid;
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assert(o->src);
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*volset = iso_volset_read(o->src, &ropts);
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if (!(*volset))
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return -3;
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o->target_volset = *volset;
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read_opts->hasRR = ropts.hasRR;
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read_opts->hasJoliet = ropts.hasJoliet;
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return 1;
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}
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/* API function. See libisoburn.h
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*/
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int isoburn_activate_session(struct burn_drive *drive)
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{
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int ret;
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struct isoburn *o;
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ret = isoburn_find_emulator(&o, drive, 0);
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if (ret < 0)
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return -1;
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if (o->emulation_mode != 1)
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return 1; /* don't need to activate session */
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ret = burn_random_access_write(drive, 0, (char*)o->target_iso_head, 64*2048, 0);
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return ret;
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}
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/** Allocate and initialize memory for libisofs related objects in
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struct isoburn.
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@param o A freshly created isoburn object with NULL pointers
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@return <=0 error , 1 = success
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*/
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int isoburn_new_rwopts(struct isoburn *o)
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{
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// FIXME
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/* <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
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* This should call isoburn_data_source_new(), that now is in
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* isoburn_start_emulation(). That is wrong, as for true ms discs
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* isoburn_start_emulation() is never called, and thus we haven't a
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* source for read previous session volset.
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* >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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*/
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/* create and initialize the data source */
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// o->src = isoburn_data_source_new(o->drive);
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// if (!o->src)
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// return -1;
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return 1;
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}
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/** Dispose memory objects created by isoburn_new_rwopts(). This function
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expect that the pointers in struct isoburn might still be NULL, i.e.
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that isoburn_new_rwopts() was not called before.
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@return <=0 error , 1 = success
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*/
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int isoburn_free_rwopts(struct isoburn *o)
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{
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if (o->src)
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data_source_free(o->src);
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return 1;
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}
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/** Initialize the emulation of multi-session on random access media.
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The need for emulation is confirmed already.
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@param o A freshly created isoburn object. isoburn_new_rwopts() was
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already called, nevertheless.
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@return <=0 error , 1 = success
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*/
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int isoburn_start_emulation(struct isoburn *o, int flag)
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{
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int ret, i;
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off_t data_count;
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struct burn_drive *drive;
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struct ecma119_pri_vol_desc *pvm;
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assert(o);
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drive= o->drive;
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/* we can assume 0 as start block for image */
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// TODO what about ms? where we validate valid iso image in ms disc?
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ret = burn_read_data(drive, (off_t) 0, (char*)o->target_iso_head,
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sizeof(o->target_iso_head), &data_count, 0);
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/* an error means an empty disc */
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if (ret <= 0) {
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o->fabricated_disc_status= BURN_DISC_BLANK;
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return 1;
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}
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// TODO remove >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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/* create and initialize the data source */
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o->src = isoburn_data_source_new(o->drive);
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if (!o->src)
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return -1;
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// <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
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/* check first 64K. If 0's, the disc is treated as a blank disc, and thus
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overwritten without extra check. */
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i = sizeof(o->target_iso_head);
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while (i && !o->target_iso_head[i-1])
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--i;
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if (!i) {
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o->fabricated_disc_status= BURN_DISC_BLANK;
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return 1;
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}
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pvm = (struct ecma119_pri_vol_desc *)(o->target_iso_head + 16 * 2048);
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if (!strncmp((char*)pvm->std_identifier, "CD001", 5)) {
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off_t size;
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/* sanity check */
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if (pvm->vol_desc_type[0] != 1 || pvm->vol_desc_version[0] != 1
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|| pvm->file_structure_version[0] != 1 ) {
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// TODO for now I treat this as a full disc
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o->fabricated_disc_status= BURN_DISC_FULL;
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return 1;
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}
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/* ok, PVM found, set size */
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size = (off_t) iso_read_lsb(pvm->vol_space_size, 4);
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size *= (off_t) 2048; /* block size in bytes */
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isoburn_set_start_byte(o, size, 0);
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o->fabricated_disc_status= BURN_DISC_APPENDABLE;
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} else if (!strncmp((char*)pvm->std_identifier, "CDXX1", 5)) {
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/* empty image */
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isoburn_set_start_byte(o, (off_t) 0, 0);
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o->fabricated_disc_status= BURN_DISC_BLANK;
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} else {
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/* treat any disc in an unknown format as full */
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o->fabricated_disc_status= BURN_DISC_FULL;
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}
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return 1;
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}
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/** Alters and writes the first 64 kB of a "media" to invalidate
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an ISO image. (It shall stay restorable by skilled humans, though).
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The result shall especially keep libisoburn from accepting the media
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image as ISO filesystem.
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@param o A fully activated isoburn object. isoburn_start_emulation()
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was already called.
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@return <=0 error , 1 = success
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*/
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int isoburn_invalidate_iso(struct isoburn *o, int flag)
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{
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/*
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* replace CD001 with CDXX1 in PVM.
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* I think this is enought for invalidating an iso image
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*/
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strncpy((char*)o->target_iso_head + 16 * 2048 + 1, "CDXX1", 5);
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return isoburn_activate_session(o->drive);
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}
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