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With the specified isolinux option, a MBR is written to the system area, and this allows the image to boot from either CD/DVD or USB sticks. This is also supported on overwriteable media (note that system area is always overwritten), but it should not work on multisession media.release-1.5.4.branch
5 changed files with 132 additions and 22 deletions
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/*
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* Copyright (c) 2008 Vreixo Formoso |
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* |
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* This file is part of the libisofs project; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. See COPYING file for details. |
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*/ |
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#include "system_area.h" |
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#include "eltorito.h" |
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#include "filesrc.h" |
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#include <string.h> |
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/*
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* Create a MBR for an isohybrid enabled ISOLINUX boot image. |
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* |
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* It is assumed that the caller has verified the readiness of the boot image |
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* by checking for 0xfb 0xc0 0x78 0x70 at bytes 0x40 to 0x43 of isolinux.bin. |
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* |
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* @param bin_lba The predicted LBA of isolinux.bin within the emerging ISO. |
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* @param img_blocks The predicted number of 2048 byte blocks in the ISO. |
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* It will get rounded up to full MBs and that many blocks |
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* must really be written as ISO 9660 image. |
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* @param mbr A buffer of at least 512 bytes to take the result which is |
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* to be written as the very beginning of the ISO. |
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* @param flag unused yet, submit 0 |
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* @return <0 = fatal, 0 = failed , 1 = ok , 2 = ok with size warning |
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*/ |
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int make_isohybrid_mbr(int bin_lba, int *img_blocks, char *mbr, int flag); |
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int iso_write_system_area(Ecma119Image *t, uint8_t *buf) |
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{ |
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if ((t == NULL) || (buf == NULL)) { |
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return ISO_NULL_POINTER; |
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} |
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/* set buf to 0s */ |
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memset(buf, 0, 16 * BLOCK_SIZE); |
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if (t->catalog != NULL && t->catalog->image->isolinux_options & 0x02) { |
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/* We need to write a MBR for an hybrid image */ |
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int ret; |
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int img_blocks; |
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img_blocks = t->curblock; |
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ret = make_isohybrid_mbr(t->bootimg->sections[0].block, &img_blocks, (char*)buf, 0); |
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// FIXME the new img_blocks size should be taken into account
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if (ret != 1) { |
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/* error, it should never happen */ |
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return ISO_ASSERT_FAILURE; |
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} |
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} |
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return ISO_SUCCESS; |
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} |
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/*
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* Copyright (c) 2008 Vreixo Formoso |
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* |
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* This file is part of the libisofs project; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. See COPYING file for details. |
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*/ |
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/*
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* Functions for dealing with the system area, this is, the first 16 blocks |
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* of the image. |
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* |
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* At this time, this is only used for hybrid boot images with isolinux. |
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*/ |
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#ifndef SYSTEM_AREA_H_ |
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#define SYSTEM_AREA_H_ |
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#include "ecma119.h" |
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/*
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* Create a MBR for an isohybrid enabled ISOLINUX boot image. |
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* |
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* It is assumed that the caller has verified the readiness of the boot image |
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* by checking for 0xfb 0xc0 0x78 0x70 at bytes 0x40 to 0x43 of isolinux.bin. |
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* |
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* @param bin_lba The predicted LBA of isolinux.bin within the emerging ISO. |
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* @param img_blocks The predicted number of 2048 byte blocks in the ISO. |
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* It will get rounded up to full MBs and that many blocks |
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* must really be written as ISO 9660 image. |
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* @param mbr A buffer of at least 512 bytes to take the result which is |
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* to be written as the very beginning of the ISO. |
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* @param flag unused yet, submit 0 |
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* @return <0 = fatal, 0 = failed , 1 = ok , 2 = ok with size warning |
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*/ |
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int make_isohybrid_mbr(int bin_lba, int *img_blocks, char *mbr, int flag); |
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/**
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* Write the system area for the given image to the given buffer. |
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* |
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* @param buf |
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* A buffer with at least 32 K allocated |
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* @return |
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* 1 if success, < 0 on error |
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*/ |
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int iso_write_system_area(Ecma119Image *t, uint8_t *buf); |
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#endif /* SYSTEM_AREA_H_ */ |
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