Improved size estimation and property assessment of El Torito hidden boot images
This commit is contained in:
parent
8a8439768c
commit
405f0f04d4
@ -1,6 +1,6 @@
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/*
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* Copyright (c) 2007 Vreixo Formoso
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* Copyright (c) 2009 - 2022 Thomas Schmitt
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* Copyright (c) 2009 - 2023 Thomas Schmitt
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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
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@ -550,6 +550,10 @@ struct image_fs_data
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};
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static int iso_impsysa_reduce_next_above(IsoImage *image, uint32_t block,
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uint32_t *next_above, int flag);
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struct child_list
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{
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IsoFileSource *file;
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@ -3598,6 +3602,8 @@ int create_boot_img_filesrc(IsoImageFilesystem *fs, IsoImage *image, int idx,
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_ImageFsData *fsdata;
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IsoFileSource *ifsrc = NULL;
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ImageFileSourceData *ifsdata = NULL;
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IsoNode *node;
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uint32_t size, next_above = 0, start_block;
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if (fs == NULL || fs->data == NULL || src == NULL) {
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return ISO_NULL_POINTER;
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@ -3611,12 +3617,32 @@ int create_boot_img_filesrc(IsoImageFilesystem *fs, IsoImage *image, int idx,
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atts.st_nlink = 1;
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/*
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* Old comment from Vreixo Formoso:
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* this is the greater problem. We don't know the size. For now, we
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* just use a single block of data. In a future, maybe we could figure out
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* a better idea. Another alternative is to use several blocks, that way
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* is less probable that we throw out valid data.
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*/
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atts.st_size = (off_t)BLOCK_SIZE;
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/* ts C31112 : Make use of size estimation "El Torito img blks :" */
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/* (Code from iso_impsysa_report_blockpath() ) */
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size = 1;
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start_block = fsdata->bootblocks[idx];
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iso_tree_get_node_of_block(image, NULL, start_block, &node, &next_above,
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0);
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ret = iso_impsysa_reduce_next_above(image, start_block, &next_above, 0);
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if (ret >= 0) {
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if (next_above != 0) {
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/* It has to fit in a single extent */
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if ((off_t) (next_above - start_block) * BLOCK_SIZE <
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(off_t) 0xffffffff) {
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size = next_above - start_block;
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} else {
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size = 0xffffffff / BLOCK_SIZE;
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}
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}
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}
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atts.st_size = (off_t) size * BLOCK_SIZE;
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/* Fill last entries */
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atts.st_dev = fsdata->id;
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@ -3648,7 +3674,7 @@ int create_boot_img_filesrc(IsoImageFilesystem *fs, IsoImage *image, int idx,
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ifsdata->info = atts;
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ifsdata->name = NULL;
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ifsdata->sections[0].block = fsdata->bootblocks[idx];
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ifsdata->sections[0].size = BLOCK_SIZE;
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ifsdata->sections[0].size = size * BLOCK_SIZE;
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ifsdata->nsections = 1;
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ifsrc->class = &ifs_class;
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@ -3665,7 +3691,7 @@ boot_fs_cleanup: ;
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}
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/** ??? >>> ts B00428 : should the max size become public ? */
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#define Libisofs_boot_image_max_sizE (4096*1024)
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#define Libisofs_boot_info_image_max_sizE (4096*1024)
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/** Guess which of the loaded boot images contain boot information tables.
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Set boot->seems_boot_info_table accordingly.
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@ -3693,7 +3719,7 @@ int iso_image_eval_boot_info_table(IsoImage *image, struct iso_read_opts *opts,
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boot->seems_grub2_boot_info = 0;
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boot->seems_isohybrid_capable = 0;
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img_size = iso_file_get_size(boot_file);
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if (img_size > Libisofs_boot_image_max_sizE || img_size < 64)
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if (img_size > Libisofs_boot_info_image_max_sizE || img_size < 64)
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continue;
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img_lba = 0;
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sections = NULL;
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@ -4112,6 +4138,8 @@ ex:;
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return ret;
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}
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/* @param flag bit0= Pre-run: Only assess partition table.
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*/
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static
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int iso_analyze_mbr(IsoImage *image, IsoDataSource *src, int flag)
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{
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@ -4134,6 +4162,11 @@ int iso_analyze_mbr(IsoImage *image, IsoDataSource *src, int flag)
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if (ret <= 0)
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goto ex;
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if((flag & 1)) {
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ret= 1;
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goto ex;
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}
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ret = iso_analyze_isohybrid(image, 0);
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if (ret < 0)
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goto ex;
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@ -4443,6 +4476,9 @@ ex:
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return ret;
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}
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/* @param flag bit0= Pre-run: Only assess partition table.
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(Yet without effect, because nothing else is done)
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*/
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static
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int iso_analyze_gpt(IsoImage *image, IsoDataSource *src, int flag)
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{
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@ -4555,6 +4591,9 @@ int iso_analyze_apm_head(IsoImage *image, IsoDataSource *src, int flag)
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return 1;
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}
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/* @param flag bit0= Pre-run: Only assess partition table.
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(Yet without effect, because nothing else is done)
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*/
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static
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int iso_analyze_apm(IsoImage *image, IsoDataSource *src, int flag)
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{
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@ -4609,6 +4648,8 @@ int iso_analyze_apm(IsoImage *image, IsoDataSource *src, int flag)
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return 1;
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}
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/* @param flag bit0= Pre-run: Only assess partition table.
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*/
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static
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int iso_analyze_mips(IsoImage *image, IsoDataSource *src, int flag)
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{
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@ -4677,12 +4718,14 @@ int iso_analyze_mips(IsoImage *image, IsoDataSource *src, int flag)
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sai->mips_vd_entries[idx]->name[8] = 0;
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sai->mips_vd_entries[idx]->boot_block = iso_read_msb(upart + 8, 4);
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sai->mips_vd_entries[idx]->boot_bytes = iso_read_msb(upart + 12, 4);
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ret = iso_tree_get_node_of_block(image, NULL,
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if (!(flag & 1)) {
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ret = iso_tree_get_node_of_block(image, NULL,
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sai->mips_vd_entries[idx]->boot_block / 4,
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&node, NULL, 0);
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if (ret > 0)
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sai->mips_boot_file_paths[idx] = iso_tree_get_node_path(node);
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sai->num_mips_boot_files++;
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if (ret > 0)
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sai->mips_boot_file_paths[idx] = iso_tree_get_node_path(node);
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sai->num_mips_boot_files++;
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}
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}
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if (sai->num_mips_boot_files > 0)
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sai->system_area_options = (1 << 2);/* MIPS Big Endian Volume Header */
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@ -4690,6 +4733,8 @@ int iso_analyze_mips(IsoImage *image, IsoDataSource *src, int flag)
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return ret;
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}
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/* @param flag bit0= Pre-run: Only assess partition table.
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*/
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static
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int iso_analyze_mipsel(IsoImage *image, IsoDataSource *src, int flag)
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{
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@ -4717,19 +4762,22 @@ int iso_analyze_mipsel(IsoImage *image, IsoDataSource *src, int flag)
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sai->mipsel_e_entry = iso_read_lsb(usad + 20, 4);
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sai->mipsel_p_filesz = iso_read_lsb(usad + 24, 4) * 512;
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sai->mipsel_seg_start = iso_read_lsb(usad + 28, 4);
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ret = iso_tree_get_node_of_block(image, NULL, sai->mipsel_seg_start / 4,
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&node, NULL, 0);
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if (ret > 0) {
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sai->mipsel_boot_file_path = iso_tree_get_node_path(node);
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file = (IsoFile *) node;
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ret = iso_file_get_old_image_sections(file, §ion_count,
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§ions, 0);
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if (ret > 0 && section_count > 0) {
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if (sections[0].block < (1 << 30) &&
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sections[0].block * 4 < sai->mipsel_seg_start)
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sai->mipsel_p_offset = sai->mipsel_seg_start -
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sections[0].block * 4;
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free(sections);
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if(!(flag & 1)) {
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ret = iso_tree_get_node_of_block(image, NULL,
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sai->mipsel_seg_start / 4, &node,
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NULL, 0);
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if (ret > 0) {
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sai->mipsel_boot_file_path = iso_tree_get_node_path(node);
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file = (IsoFile *) node;
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ret = iso_file_get_old_image_sections(file, §ion_count,
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§ions, 0);
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if (ret > 0 && section_count > 0) {
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if (sections[0].block < (1 << 30) &&
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sections[0].block * 4 < sai->mipsel_seg_start)
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sai->mipsel_p_offset = sai->mipsel_seg_start -
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sections[0].block * 4;
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free(sections);
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}
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}
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}
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/* DEC Boot Block for MIPS Little Endian */
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@ -4738,6 +4786,8 @@ int iso_analyze_mipsel(IsoImage *image, IsoDataSource *src, int flag)
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return 1;
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}
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/* @param flag bit0= Pre-run: Only assess partition table.
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*/
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static
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int iso_analyze_sun(IsoImage *image, IsoDataSource *src, int flag)
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{
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@ -4810,7 +4860,8 @@ int iso_analyze_sun(IsoImage *image, IsoDataSource *src, int flag)
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sai->sparc_grub2_core_size + 2047) / 2048;
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if (last_core_block > 0)
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last_core_block--;
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if (last_core_block > 17 && last_core_block < sai->image_size) {
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if (last_core_block > 17 && last_core_block < sai->image_size &&
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!(flag & 1)) {
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ret = iso_tree_get_node_of_block(image, NULL,
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(uint32_t) last_core_block, &node,
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NULL, 0);
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@ -4829,6 +4880,8 @@ int iso_analyze_sun(IsoImage *image, IsoDataSource *src, int flag)
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return 1;
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}
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/* @param flag bit0= Pre-run: Only assess partition table.
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*/
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static
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int iso_analyze_hppa(IsoImage *image, IsoDataSource *src, int flag)
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{
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@ -4870,17 +4923,19 @@ int iso_analyze_hppa(IsoImage *image, IsoDataSource *src, int flag)
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sai->hppa_ramdisk_len = iso_read_msb(usad + 20, 4);
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adrs[3] = sai->hppa_bootloader_adr = iso_read_msb(usad + 240, 4);
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sai->hppa_bootloader_len = iso_read_msb(usad + 244, 4);
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for (i = 0; i < 4; i++) {
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paths[i] = NULL;
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ret = iso_tree_get_node_of_block(image, NULL, adrs[i] / 2048,
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&node, NULL, 0);
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if (ret > 0)
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paths[i] = iso_tree_get_node_path(node);
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if(!(flag & 1)) {
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for (i = 0; i < 4; i++) {
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paths[i] = NULL;
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ret = iso_tree_get_node_of_block(image, NULL, adrs[i] / 2048,
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&node, NULL, 0);
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if (ret > 0)
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paths[i] = iso_tree_get_node_path(node);
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}
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sai->hppa_kernel_32 = paths[0];
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sai->hppa_kernel_64 = paths[1];
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sai->hppa_ramdisk = paths[2];
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sai->hppa_bootloader = paths[3];
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}
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sai->hppa_kernel_32 = paths[0];
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sai->hppa_kernel_64 = paths[1];
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sai->hppa_ramdisk = paths[2];
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sai->hppa_bootloader = paths[3];
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if (sai->hppa_hdrversion == 5)
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sai->hppa_ipl_entry = iso_read_msb(usad + 248, 4);
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@ -4891,6 +4946,8 @@ int iso_analyze_hppa(IsoImage *image, IsoDataSource *src, int flag)
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return 1;
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}
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/* @param flag bit0= Pre-run: Only assess partition table.
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*/
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static
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int iso_analyze_alpha_boot(IsoImage *image, IsoDataSource *src, int flag)
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{
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@ -4915,25 +4972,27 @@ int iso_analyze_alpha_boot(IsoImage *image, IsoDataSource *src, int flag)
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sai->alpha_boot_image = NULL;
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sai->alpha_boot_image_size = (uint64_t) iso_read_lsb64(usad + 480);
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sai->alpha_boot_image_adr = (uint64_t) iso_read_lsb64(usad + 488);
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ret = iso_tree_get_node_of_block(image, NULL,
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if (!(flag & 1)) {
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ret = iso_tree_get_node_of_block(image, NULL,
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(uint32_t) (sai->alpha_boot_image_adr / 4),
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&node, NULL, 0);
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if (ret > 0) {
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if (iso_node_get_type(node) != LIBISO_FILE)
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return 0;
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file = (IsoFile *) node;
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ret = iso_file_get_old_image_sections(file, §ion_count,
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§ions, 0);
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if (ret > 0 && section_count > 0) {
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size = sections[0].size / 512 + !!(sections[0].size % 512);
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free(sections);
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if (size != sai->alpha_boot_image_size)
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return 0;
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}
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sai->alpha_boot_image = iso_tree_get_node_path(node);
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} else if (strncmp(sad, "Linux/Alpha aboot for ISO filesystem.", 37) != 0
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|| sad[37] != 0) {
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return 0; /* Want to see either boot file or genisoimage string */
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if (ret > 0) {
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if (iso_node_get_type(node) != LIBISO_FILE)
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return 0;
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file = (IsoFile *) node;
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ret = iso_file_get_old_image_sections(file, §ion_count,
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§ions, 0);
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if (ret > 0 && section_count > 0) {
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size = sections[0].size / 512 + !!(sections[0].size % 512);
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free(sections);
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if (size != sai->alpha_boot_image_size)
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return 0;
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}
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sai->alpha_boot_image = iso_tree_get_node_path(node);
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} else if (strncmp(sad, "Linux/Alpha aboot for ISO filesystem.", 37)
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!= 0 || sad[37] != 0) {
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return 0; /* Want to see either boot file or genisoimage string */
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}
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}
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sai->system_area_options = (6 << 2);
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return 1;
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@ -5016,6 +5075,8 @@ int iso_impsysa_reduce_next_above(IsoImage *image, uint32_t block,
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struct iso_file_section *sections = NULL;
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sai = image->imported_sa_info;
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if (sai == NULL)
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return 0;
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/* PVD, path table, root directory of active and of first session */
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for (i = 0; i < sai->num_meta_struct_blocks; i++)
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@ -5066,7 +5127,7 @@ int iso_impsysa_reduce_next_above(IsoImage *image, uint32_t block,
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iso_impsysa_reduce_na(block, next_above, sai->image_size);
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return ISO_SUCCESS;
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return 1;
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}
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/* @param flag bit0= try to estimate the size if no path is found
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@ -5804,6 +5865,9 @@ ex:
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return ret;
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}
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/* @param flag bit0= Pre-run: Only assess partition tables. Do not refer to
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loaded tree or El Torito boot equipment.
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*/
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static
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int iso_analyze_system_area(IsoImage *image, IsoDataSource *src,
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struct iso_read_opts *opts, uint32_t image_size,
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@ -5825,48 +5889,50 @@ int iso_analyze_system_area(IsoImage *image, IsoDataSource *src,
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image->imported_sa_info->image_size = image_size;
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image->imported_sa_info->pvd_block = opts->block + 16;
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ret = iso_analyze_mbr(image, src, 0);
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ret = iso_analyze_mbr(image, src, flag & 1);
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if (ret < 0)
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goto ex;
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ret = iso_analyze_gpt(image, src, 0);
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ret = iso_analyze_gpt(image, src, flag & 1);
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if (ret < 0)
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goto ex;
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ret = iso_analyze_apm(image, src, 0);
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ret = iso_analyze_apm(image, src, flag & 1);
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if (ret < 0)
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goto ex;
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sao = image->imported_sa_info->system_area_options;
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sa_type = (sao >> 2) & 0x3f;
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sa_sub = (sao >> 10) & 0xf;
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if (sa_type == 0 && !((sao & 3) || sa_sub == 1 || sa_sub == 2)) {
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ret = iso_analyze_mips(image, src, 0);
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ret = iso_analyze_mips(image, src, flag & 1);
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if (ret < 0)
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goto ex;
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if (ret == 0) {
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ret = iso_analyze_mipsel(image, src, 0);
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ret = iso_analyze_mipsel(image, src, flag & 1);
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if (ret < 0)
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goto ex;
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}
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if (ret == 0) {
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ret = iso_analyze_sun(image, src, 0);
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ret = iso_analyze_sun(image, src, flag & 1);
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if (ret < 0)
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goto ex;
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}
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}
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if (sa_type == 0 && !((sao & 3) || sa_sub == 1)) {
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/* HP-PA PALO v5 can look like generic MBR */
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ret = iso_analyze_hppa(image, src, 0);
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ret = iso_analyze_hppa(image, src, flag & 1);
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if (ret < 0)
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goto ex;
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/* DEC Alpha has checksum bytes where MBR has its magic number */
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if (ret == 0) {
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ret = iso_analyze_alpha_boot(image, src, 0);
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ret = iso_analyze_alpha_boot(image, src, flag & 1);
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if (ret < 0)
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goto ex;
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}
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}
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ret = iso_record_meta_struct_blocks(image, src, 0);
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if (ret < 0)
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goto ex;
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if (!(flag & 1)) {
|
||||
ret = iso_record_meta_struct_blocks(image, src, 0);
|
||||
if (ret < 0)
|
||||
goto ex;
|
||||
}
|
||||
|
||||
ret = ISO_SUCCESS;
|
||||
ex:;
|
||||
@ -6392,6 +6458,7 @@ int iso_image_import(IsoImage *image, IsoDataSource *src,
|
||||
int features_allocated = 0;
|
||||
static char *tree_loaded_names[3]= {"ISO9660", "Joliet", "ISO9660:1999"};
|
||||
int root_has_aaip = 0, rrip_version_1_10;
|
||||
unsigned long img_size;
|
||||
|
||||
if (image == NULL || src == NULL || opts == NULL) {
|
||||
return ISO_NULL_POINTER;
|
||||
@ -6546,6 +6613,27 @@ int iso_image_import(IsoImage *image, IsoDataSource *src,
|
||||
}
|
||||
}
|
||||
|
||||
/* Pre-assessment of System Area because image->imported_sa_info with
|
||||
assessed partitions is needed in create_boot_img_filesrc().
|
||||
Nevertheless, some properties can only be determined later, when
|
||||
other image properties have been assessed. So there will be another
|
||||
run of iso_analyze_system_area() without flag bit0 when more of the
|
||||
imported image is known.
|
||||
*/
|
||||
if (opts->load_system_area && image->system_area_data != NULL &&
|
||||
!(opts->read_features & 4)) {
|
||||
/* Preliminary assessment. Not complete because some aspects of the
|
||||
filesystem have not been loaded yet.
|
||||
*/
|
||||
ret = iso_analyze_system_area(image, src, opts, data->nblocks, 1);
|
||||
if (ret < 0) {
|
||||
iso_msg_submit(-1, ISO_SYSAREA_PROBLEMS, 0,
|
||||
"Problem encountered during inspection of System Area:");
|
||||
iso_msg_submit(-1, ISO_SYSAREA_PROBLEMS, 0,
|
||||
iso_error_to_msg(ret));
|
||||
}
|
||||
}
|
||||
|
||||
/* if old image has el-torito, add a new catalog */
|
||||
if (data->eltorito) {
|
||||
|
||||
@ -6668,20 +6756,28 @@ int iso_image_import(IsoImage *image, IsoDataSource *src,
|
||||
/* warn about hidden images */
|
||||
|
||||
if (!(opts->read_features & 4)) {
|
||||
img_size = iso_file_get_size((IsoFile *) node);
|
||||
if (image->bootcat->bootimages[idx]->platform_id == 0xef) {
|
||||
iso_msg_submit(image->id, ISO_ELTO_EFI_HIDDEN, 0,
|
||||
"Found hidden El-Torito image for EFI.");
|
||||
iso_msg_submit(image->id, ISO_GENERAL_NOTE, 0,
|
||||
"EFI image start and size: %lu * 2048 , %lu * 512",
|
||||
"EFI image start and load size: %lu * 2048 , %lu * 512",
|
||||
(unsigned long int)
|
||||
image->bootcat->bootimages[idx]->appended_start,
|
||||
(unsigned long int)
|
||||
image->bootcat->bootimages[idx]->load_size);
|
||||
iso_msg_submit(image->id, ISO_GENERAL_NOTE, 0,
|
||||
"Roughly estimated EFI image size: %lu bytes",
|
||||
img_size);
|
||||
} else {
|
||||
iso_msg_submit(image->id, ISO_EL_TORITO_HIDDEN, 0,
|
||||
"Found hidden El-Torito image. Its size could not "
|
||||
"be figured out, so image modify or boot image "
|
||||
"patching may lead to bad results.");
|
||||
"Found hidden El-Torito image for Non-EFI platform.",
|
||||
img_size);
|
||||
iso_msg_submit(image->id, ISO_EL_TORITO_HIDDEN, 0,
|
||||
"Roughly estimated image size: %lu bytes",
|
||||
img_size);
|
||||
iso_msg_submit(image->id, ISO_EL_TORITO_HIDDEN, 0,
|
||||
"Image modification or boot image patching may lead to bad results.");
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -6926,6 +7022,9 @@ int iso_image_import(IsoImage *image, IsoDataSource *src,
|
||||
if (ret < 0)
|
||||
goto import_revert;
|
||||
|
||||
/* Second run of iso_analyze_system_area() after El Torito equipment and
|
||||
file tree have been assessed
|
||||
*/
|
||||
if (opts->load_system_area && image->system_area_data != NULL &&
|
||||
!(opts->read_features & 4)) {
|
||||
ret = iso_analyze_system_area(image, src, opts, data->nblocks, 0);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user