66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/*
|
|
* Copyright (c) 2008 Vreixo Formoso
|
|
*
|
|
* This file is part of the libisofs project; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation. See COPYING file for details.
|
|
*/
|
|
|
|
#include "system_area.h"
|
|
#include "eltorito.h"
|
|
#include "filesrc.h"
|
|
|
|
#include <string.h>
|
|
|
|
|
|
|
|
/*
|
|
* Create a MBR for an isohybrid enabled ISOLINUX boot image.
|
|
*
|
|
* It is assumed that the caller has verified the readiness of the boot image
|
|
* by checking for 0xfb 0xc0 0x78 0x70 at bytes 0x40 to 0x43 of isolinux.bin.
|
|
*
|
|
* @param bin_lba The predicted LBA of isolinux.bin within the emerging ISO.
|
|
* @param img_blocks The predicted number of 2048 byte blocks in the ISO.
|
|
* It will get rounded up to full MBs and that many blocks
|
|
* must really be written as ISO 9660 image.
|
|
* @param mbr A buffer of at least 512 bytes to take the result which is
|
|
* to be written as the very beginning of the ISO.
|
|
* @param flag unused yet, submit 0
|
|
* @return <0 = fatal, 0 = failed , 1 = ok , 2 = ok with size warning
|
|
*/
|
|
int make_isohybrid_mbr(int bin_lba, int *img_blocks, char *mbr, int flag);
|
|
|
|
int iso_write_system_area(Ecma119Image *t, uint8_t *buf)
|
|
{
|
|
if ((t == NULL) || (buf == NULL)) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
|
|
/* set buf to 0s */
|
|
memset(buf, 0, 16 * BLOCK_SIZE);
|
|
|
|
if (t->catalog != NULL && t->catalog->image->isolinux_options & 0x02) {
|
|
/* We need to write a MBR for an hybrid image */
|
|
int ret;
|
|
int img_blocks;
|
|
|
|
img_blocks = t->curblock;
|
|
ret = make_isohybrid_mbr(t->bootimg->sections[0].block, &img_blocks, (char*)buf, 0);
|
|
|
|
/*
|
|
API description of el_torito_set_isolinux_options() prescribes
|
|
to pad to full MB.
|
|
So this is not urgent any more :
|
|
|
|
// FIXME the new img_blocks size should be taken into account
|
|
*/
|
|
|
|
if (ret != 1) {
|
|
/* error, it should never happen */
|
|
return ISO_ASSERT_FAILURE;
|
|
}
|
|
}
|
|
return ISO_SUCCESS;
|
|
}
|