btparser/cparser/tests/ElTorito.bt

BitfieldRightToLeft();
BitfieldDisablePadding();

#define BLOCK_SIZE 2048
#define BOOT_RECORD_OFFSET 2048 * 16
#define ELTORITO_OFFSET 2048 * 17

typedef struct {
    ubyte       BootIndicator;
    char        IsoId[5];
    ubyte       Version;
    char        Identifier[32];
    ubyte       Unused[32];
    uint32      BootCatalog;
    ubyte       Unused2[5];
    uint32      VolSpaceSize[2];
} BOOT_RECORD_DESC;

typedef union {
    struct {
        ubyte   HeaderId;
        ubyte   PlatformId;
        uint16  Res0;
        char    Id[24];
        uint16  Checksum <format=hex>;
        uint16  Sig <format=hex>; // 0xaa55
    } ValEntry;
    
    struct {
        enum <ubyte> { BOOTABLE=0x88, NOT_BOOTABLE=0x0 } BootId <format=hex>;
        enum <ubyte> { NO_EMULATION=0x0, DISKETTE_1_2=0x1, DISKETTE_1_44=0x2, DISKETTE_2_88=0x3, HARDDISK=0x4 } MediaType <format=hex>;
        uint16  LoadSegment <format=hex>;
        ubyte   SystemType;
        ubyte   Unused;
        uint16  SectorCount;
        uint32  LoadLba;
    } DefaultEntry;
    
    struct {
        enum <ubyte> { NOT_LAST_HEADER=0x90, LAST_HEADER=0x91 } HeaderId <format=hex>;
        enum <ubyte> { PC_80x86=0x0, POWERPC=0x1, MAC=0x2 } PlatformId <format=hex>;
        uint16  NumSectionEntries;
        char    IdString[28];
    } SecHeader;
    
    struct {
        enum <ubyte> { SECTION_BOOTABLE=0x88, SECTION_NOT_BOOTABLE=0x0 } BootId <format=hex>;
        enum <ubyte> { SEC_NO_EMULATION=0x0, SEC_DISKETTE_1_2=0x1, SEC_DISKETTE_1_44=0x2, SEC_DISKETTE_2_88=0x3, SEC_HARDDISK=0x4 } MediaType <format=hex>;
        uint16  LoadSegment <format=hex>;
        ubyte   SystemType;
        ubyte   Unused;
        uint16  SectorCount;
        uint32  LoadLba;
        enum <ubyte> { NO_SELECTION_CRITERIA=0x0, LANGUAGE_AND_VERSION=0x1 } SelectionType;
        ubyte   Criteria[19];
    } SecEntry;
    
} EL_TORITO_ENTRIES;

LittleEndian();

FSeek(ELTORITO_OFFSET);
BOOT_RECORD_DESC boot_record;

FSeek(boot_record.BootCatalog * BLOCK_SIZE);
EL_TORITO_ENTRIES el_torito[BLOCK_SIZE / sizeof(EL_TORITO_ENTRIES) - 1];