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[iso] add basic El-Torito image parsing to libcdio
* Based on El-Torito specs found at https://pdos.csail.mit.edu/6.828/2014/readings/boot-cdrom.pdf. * Follows 7-zip's virtual '[BOOT]/#...' naming conventions (though we don't check for the full name). * Limited to 8 NoEmul images.
This commit is contained in:
Pete Batard
parent
2cebf914fd
commit
ae6732c07b
3 changed files with 87 additions and 7 deletions
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@ -162,6 +162,7 @@ extern enum iso_vd_enum_s {
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extern const char ISO_STANDARD_ID[sizeof("CD001")-1];
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#define ISO_STANDARD_ID "CD001"
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#define EL_TORITO_ID "EL TORITO SPECIFICATION\0\0\0\0\0\0\0\0\0"
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#define CDIO_EXTENT_BLOCKS(size) ((size + (ISO_BLOCKSIZE - 1)) / ISO_BLOCKSIZE)
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@ -506,6 +507,37 @@ struct iso9660_svd_s {
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typedef struct iso9660_svd_s iso9660_svd_t;
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/*!
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\brief ISO-9660 Boot Record Volume Descriptor.
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*/
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struct iso9660_brvd_s {
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uint8_t type; /**< ISO_VD_BOOT_RECORD - 0 */
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char id[5]; /**< ISO_STANDARD_ID "CD001" */
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uint8_t version; /**< value 1 for El Torito */
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char system_id[ISO_MAX_SYSTEM_ID]; /**< Boot system ID */
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uint8_t unused1[32]; /**< unused - value 0 */
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uint32_t boot_catalog_sector; /**< first sector of boot catalog */
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uint8_t unused2[1973]; /**< Unused - value 0 */
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} GNUC_PACKED;
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typedef struct iso9660_brvd_s iso9660_brvd_t;
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/*!
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\brief ISO-9660 Boot Record Volume Descriptor.
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*/
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struct iso9660_br_s {
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uint8_t boot_id; /**< Boot indicator - 0x88 */
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uint8_t media_type; /**< Boot media type - 0 for no emul. */
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uint16_t load_seg; /**< Load segment for x86 */
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uint8_t system_type; /**< System type - 0 for x86 */
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uint8_t unused1;
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uint16_t num_sectors; /**< Sector count of the image */
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uint32_t image_lsn; /**< Start address of the image */
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uint8_t unused2[20];
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} GNUC_PACKED;
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typedef struct iso9660_br_s iso9660_br_t;
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PRAGMA_END_PACKED
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/*! \brief A data type for a list of ISO9660
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@ -582,7 +614,8 @@ extern enum iso_extension_enum_s {
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ISO_EXTENSION_JOLIET_LEVEL2 = 0x02,
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ISO_EXTENSION_JOLIET_LEVEL3 = 0x04,
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ISO_EXTENSION_ROCK_RIDGE = 0x08,
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ISO_EXTENSION_HIGH_SIERRA = 0x10
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ISO_EXTENSION_HIGH_SIERRA = 0x10,
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ISO_EXTENSION_EL_TORITO = 0x20
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} iso_extension_enums;
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@ -59,6 +59,8 @@
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#include "_cdio_stdio.h"
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#include "cdio_private.h"
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#define MAX_BOOT_IMAGES 8
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/** Implementation of iso9660_t type */
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struct _iso9660_s {
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cdio_header_t header; /**< Internal header - MUST come first. */
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@ -83,6 +85,10 @@ struct _iso9660_s {
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be CDIO_CD_FRAMESIZE_RAW (2352) or
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M2RAW_SECTOR_SIZE (2336).
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*/
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struct {
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uint32_t lsn; /**< Start LSN of an El-Torito bootable image */
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uint32_t num_sectors; /**< Number of sectors of a bootable image */
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} boot_img[MAX_BOOT_IMAGES];
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int i_fuzzy_offset; /**< Adjustment in bytes to make ISO_STANDARD_ID
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("CD001") come out as ISO_PVD_SECTOR
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(frame 16). Normally this should be 0
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@ -505,7 +511,8 @@ iso9660_ifs_read_superblock (iso9660_t *p_iso,
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iso_extension_mask_t iso_extension_mask)
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{
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iso9660_svd_t p_svd; /* Secondary volume descriptor. */
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int i;
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iso9660_brvd_t* p_brvd = (iso9660_brvd_t*)&p_svd; /* Boot record volume descriptor. */
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int i, j, k;
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if (!p_iso || !iso9660_ifs_read_pvd(p_iso, &(p_iso->pvd)))
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return false;
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@ -516,6 +523,24 @@ iso9660_ifs_read_superblock (iso9660_t *p_iso,
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for (i=1; (0 != iso9660_iso_seek_read (p_iso, &p_svd, ISO_PVD_SECTOR+i, 1)); i++) {
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if (ISO_VD_END == from_711(p_svd.type) ) /* Last SVD */
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break;
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if (iso_extension_mask & ISO_EXTENSION_EL_TORITO) {
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/* Check for an El-Torito boot volume descriptor */
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if (ISO_VD_BOOT_RECORD == from_711(p_svd.type) &&
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(memcmp(p_brvd->system_id, EL_TORITO_ID, ISO_MAX_SYSTEM_ID) == 0)) {
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/* Perform very basic parsing of boot entries to fill an image table */
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iso9660_br_t br[ISO_BLOCKSIZE / sizeof(iso9660_br_t)];
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if (iso9660_iso_seek_read(p_iso, &br, p_brvd->boot_catalog_sector, 1) == ISO_BLOCKSIZE) {
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for (j = 0, k = 0;
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j < (ISO_BLOCKSIZE / sizeof(iso9660_br_t)) && k < MAX_BOOT_IMAGES;
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j++) {
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if (br[j].boot_id == 0x88 && br[j].media_type == 0) {
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p_iso->boot_img[k].lsn = br[j].image_lsn;
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p_iso->boot_img[k++].num_sectors = br[j].num_sectors;
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}
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}
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}
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}
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}
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if ( ISO_VD_SUPPLEMENTARY == from_711(p_svd.type) ) {
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/* We're only interested in Joliet => make sure the SVD isn't overwritten */
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if (p_iso->u_joliet_level == 0)
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@ -1441,6 +1466,28 @@ iso9660_fs_stat_translate (CdIo_t *p_cdio, const char psz_path[])
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iso9660_stat_t *
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iso9660_ifs_stat_translate (iso9660_t *p_iso, const char psz_path[])
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{
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/* Special case for virtual El-Torito boot images ('[BOOT]/#.img') */
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if (psz_path && (strncmp(psz_path, "[BOOT]/", 7) == 0)) {
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int index = psz_path[7] - '0';
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iso9660_stat_t* p_stat;
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if (strlen(psz_path) < 8)
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return NULL;
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if ((psz_path[7] < '0') || (psz_path[7] > '0' + MAX_BOOT_IMAGES - 1))
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return NULL;
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if (p_iso->boot_img[index].lsn == 0 || p_iso->boot_img[index].num_sectors == 0)
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return NULL;
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p_stat = calloc(1, sizeof(iso9660_stat_t) + strlen(psz_path));
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if (!p_stat) {
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cdio_warn("Couldn't calloc(1, %d)", (int)sizeof(iso9660_stat_t));
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return NULL;
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}
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p_stat->lsn = p_iso->boot_img[index].lsn;
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p_stat->total_size = p_iso->boot_img[index].num_sectors * ISO_BLOCKSIZE;
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p_stat->type = _STAT_FILE;
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strcpy(p_stat->filename, psz_path);
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return p_stat;
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}
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return fs_stat_translate(p_iso, (stat_root_t *) _ifs_stat_root,
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(stat_traverse_t *) _fs_iso_stat_traverse,
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psz_path);
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10
src/rufus.rc
10
src/rufus.rc
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@ -33,7 +33,7 @@ LANGUAGE LANG_NEUTRAL, SUBLANG_NEUTRAL
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IDD_DIALOG DIALOGEX 12, 12, 232, 326
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STYLE DS_SETFONT | DS_MODALFRAME | DS_CENTER | WS_MINIMIZEBOX | WS_POPUP | WS_CAPTION | WS_SYSMENU
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EXSTYLE WS_EX_ACCEPTFILES
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CAPTION "Rufus 4.4.2099"
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CAPTION "Rufus 4.4.2100"
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FONT 9, "Segoe UI Symbol", 400, 0, 0x0
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BEGIN
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LTEXT "Drive Properties",IDS_DRIVE_PROPERTIES_TXT,8,6,53,12,NOT WS_GROUP
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@ -392,8 +392,8 @@ END
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//
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VS_VERSION_INFO VERSIONINFO
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FILEVERSION 4,4,2099,0
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PRODUCTVERSION 4,4,2099,0
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FILEVERSION 4,4,2100,0
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PRODUCTVERSION 4,4,2100,0
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FILEFLAGSMASK 0x3fL
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#ifdef _DEBUG
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FILEFLAGS 0x1L
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@ -411,13 +411,13 @@ BEGIN
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VALUE "Comments", "https://rufus.ie"
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VALUE "CompanyName", "Akeo Consulting"
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VALUE "FileDescription", "Rufus"
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VALUE "FileVersion", "4.4.2099"
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VALUE "FileVersion", "4.4.2100"
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VALUE "InternalName", "Rufus"
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VALUE "LegalCopyright", "© 2011-2024 Pete Batard (GPL v3)"
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VALUE "LegalTrademarks", "https://www.gnu.org/licenses/gpl-3.0.html"
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VALUE "OriginalFilename", "rufus-4.4.exe"
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VALUE "ProductName", "Rufus"
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VALUE "ProductVersion", "4.4.2099"
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VALUE "ProductVersion", "4.4.2100"
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END
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END
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BLOCK "VarFileInfo"
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