Some initial code for libisofs related wraps.
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@ -9,6 +9,16 @@
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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 "../libisofs/libisofs.h"
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#include "../libburn/libburn.h"
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#include "isoburn.h"
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// TODO this are libisofs internals, should then be imported here?
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#include "../libisofs/util.h"
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#include "../libisofs/ecma119.h"
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/* Vreixo:
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@ -25,11 +35,21 @@
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/* API function. See libisoburn.h
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*/
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int isoburn_update_iso_descriptors(struct burn_drive *drive)
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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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/* >>> code <<< */
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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, o->target_iso_head, 64*2048, 0);
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return ret;
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}
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@ -40,9 +60,26 @@ int isoburn_update_iso_descriptors(struct burn_drive *drive)
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*/
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int isoburn_new_rwopts(struct isoburn *o)
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{
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struct ecma119_source_opts *wopts;
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/* >>> code <<< */
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/* create and initialize target_ropts read options */
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o->target_ropts = calloc(1, sizeof(struct ecma119_read_opts));
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if (!p->target_ropts)
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return -1;
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/* TODO mmm, maybe we don't need struct ecma119_read_opts in libisoburn */
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/* create and initialize new_wopts write options for new image */
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wopts = calloc(1, sizeof(struct ecma119_source_opts));
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if (!wopts)
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return -1;
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wopts->overwrite = o->target_iso_head;
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o->new_wopts = wopts;
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return 1;
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}
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@ -53,9 +90,9 @@ int isoburn_new_rwopts(struct isoburn *o)
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*/
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int isoburn_free_rwopts(struct isoburn *o)
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{
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/* >>> code <<< */
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free(o->target_ropts);
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free(o->new_wopts);
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return 1;
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}
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@ -67,12 +104,60 @@ int isoburn_free_rwopts(struct isoburn *o)
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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;
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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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/* >>> code <<< */
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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, o->target_iso_head,
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sizeof(o->target_iso_head), &data_count, 0);
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if (ret <= 0)
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return -1;
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pvm = (struct ecma119_pri_vol_desc *)(o->target_iso_head + 16 * 2048);
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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 unsupported image type, maybe not image or damaged image
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// should this be an error?
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return -2;
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}
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if (!strncmp((char*)pvm->std_identifier, "CD001", 5)) {
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off_t size;
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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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// TODO where I get the struct burn_write_opts * from?
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// why that function doesn't receive a struct isoburn
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isoburn_write_opts_set_start_byte(XXXXXX, size);
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} else if (!strncmp((char*)pvm->std_identifier, "CDXX1", 5)) {
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/* empty image */
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// TODO where I get the struct burn_write_opts * from?
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// why that function doesn't receive a struct isoburn
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isoburn_write_opts_set_start_byte(XXXXXX, (off_t) 0);
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} else {
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// TODO not valid iso image
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// should this be an error?
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return -2;
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}
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return 1;
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}
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// TODO why read is needed? can't I assume 64k are already cached?
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// TODO can I assume isoburn_start_emulation was already called and
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// disc contains a valid image?
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// TODO why "The result shall especially keep libisofs from accepting the
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// media image as ISO filesystem"?
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/** Reads, 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 libisofs from accepting the media
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@ -83,9 +168,11 @@ int isoburn_start_emulation(struct isoburn *o, int flag)
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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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/* >>> code <<< */
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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(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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