资料：
1、introduction_to_iso9660.pdf
2、boot-cdrom.pdf
Normal ISO9600:
offset: 16*2048[0x8000]
The Primary Volume Descriptor
#pragma pack(push,1) typedef struct _PRIMARY_VOLUME_DESCRIPTOR { char VolDesType; //Volume Descriptor Type[1] char StandardId[5]; //Standard Identifier[CD001] char VolDesVer; //Volume Descriptor Version[1] char Reserved1; //[0x00] char SystemId[32]; //System Identifier[a-characters allowed18] char VolumeId[32]; //Volume Identifier[d-characters allowed19] char Reserved2[8]; //[0x00] unsigned long dwVolSpaSizeLow; //Number of logical blocks in the Volume. unsigned long dwVolSpaSizeHigh; char Reserved3[32]; //[0x00] unsigned long dwVolSetSize; //The assigned Volume Set size of the Volume. unsigned long dwVolSeqNum; //The ordinal number of the volume in the Volume Set. unsigned long dwLogBlockSize; //The size in bytes of a Logical Block. unsigned long dwPathTabSizeLow; //Length in bytes of the path table. unsigned long dwPathTabSizeHigh; unsigned long dwLocTypeLPT; unsigned long dwLocOptionalTypeLPT; unsigned long dwLocTypeMPT; unsigned long dwLocOptionalTypeMPT; char DirRecTootDir[34]; char VolSetId[128]; //Volume Set Identifier. d-characters allowed. char PublisherId[128]; //Publisher Identifier. a-characters allowed. char DataPerId[128]; //Data Perparer Identifier. a-characters allowed. char AppId[128]; //Applicatoin Identifier. char CopyrightFileId[37]; //Copyright File Identifier. char AbbstractFileId[37]; //Abstract File Identifier. char BiblioFileId[37]; //Bibliographic File Identifier. char VolCreaDT[17]; //Volume Creation Date and Time. char VolModifDT[17]; //Volume Modification Date and Time. char VolExpirDT[17]; //Volume Expiration Date and Time. char VolEffecDT[17]; //Volume Effective Data and Time. char FileStrucVer; //File Structure Version[1] char Reserved4; //Reserved for future standardization.[0x00] char AppUse[512]; //Application Use. char Reserved5[653]; //Reserved for future standardization.[0x00] }PRIMARY_VOLUME_DESCRIPTOR, *PPRIMARY_VOLUME_DESCRIPTOR; #pragma pack(pop)
Date and Time:
Represented by seven bytes:
1: Number of years since 1900
2: Month of the year from 1 to 12
3: Day of the Month from 1 to 31
4: Hour of the day from 0 to 23
5: Minute of the hour from 0 to 59
6: second of the minute from 0 to 59
7: Offset from Greenwich Mean Time in Number of
15 minute intervals from -48(West) to +52(East)
boot CD_ROM:
offset: 16*2048[0x8000]
The Primary Volume Descriptor
offset: 17*2048[0x8800]
Boot Record Volume Descriptor
#pragma pack(push,1) typedef struct _BOOTRECORD_VOLUME_DESCRIPTOR { char BootRecordInd; //Boot Record Indicator, must be 0. char ISO_9660Id[4]; //ISO-9660 Identifier, must be "CD001". char VolVer; //Version of this descriptor, must be 1. char BootSystemId[32]; //Boot System Identifier, must be "EL TORITO SPECIFICATION" padded with 0's. char Reserved1[32]; //Unused, must be 0. unsigned long dwSecOfBootCatalog; //Absolute pointer to first sector of Boot Catolog. char Reserved2[1974]; //Unused, must be 0. }BOOTRECORD_VOLUME_DESCRIPTOR, *PPBOOTRECORD_VOLUME_DESCRIPTOR; #pragma pack(pop)
Booting Catalog:
1. Validation Entry
#pragma pack(push,1) typedef struct _BC_VALIDATION_ENTRY { char HeaderID; //Header ID, must be 01. char PlatformID; //Platform ID. 0=80x86, 1=Power PC, 2=Mac unsigned short wReserved; //Reserved, must be 0. char DeveloperID[24]; //ID string. to identify the developer of the CD_ROM unsigned short wChecksum; //Chaecksum Word. This sum of all the words in this record should be 0. char kb55; //Key byte,must be 0x55 char kbAA; //key byte,must be 0xAA } BC_VALIDATION_ENTRY, *PBC_VALIDATION_ENTRY; #pragma pack(pop)
2. Initial.Default Entry
#pragma pack(push,1) typedef struct _BC_VALIDATION_ENTRY { char HeaderID; //Header ID, must be 01. char PlatformID; //Platform ID. 0=80x86, 1=Power PC, 2=Mac unsigned short wReserved; //Reserved, must be 0. char DeveloperID[24]; //ID string. to identify the developer of the CD_ROM unsigned short wChecksum; //Chaecksum Word. This sum of all the words in this record should be 0. char kb55; //Key byte,must be 0x55 char kbAA; //key byte,must be 0xAA } BC_VALIDATION_ENTRY, *PBC_VALIDATION_ENTRY; #pragma pack(pop)
2.1 Boot media type.
This specifies what media the boot image is intended to
emulate in bits 0-3 as follows, bits 4-7 are reserved and must be 0.
Bits 0-3 count as follows:
0 No Emulation
1 1.2 meg diskette
2 1.44 meg diskette
3 2.88 meg diskette
4 Hard Disk (drive 80)
5-F Reserved, invalid at this time
3. Section Header
#pragma pack(push,1) typedef struct _BC_SECTION_HEADER_ENTRY { char HeaderInd; //Header Indicator as follows: 90-Header more headers follow, 91-Final Header char PlatformID; //Platform ID. 0=80x86, 1=Power PC, 2=Mac unsigned short wNumber; //Number of section entries following this header char ID[28]; //ID string } BC_SECTION_HEADER_ENTRY, *PBC_SECTION_HEADER_ENTRY; #pragma pack(pop)
4. Section Entry
#pragma pack(push,1) typedef struct _BC_SECTION_ENTRY { char BootInd; //Boot Indicator. 88=Bootable, 00=Not Bootable char BootMediaType; //Boot media type. unsigned short wLoadSegment; //Load Segment. 0 use 0x7C0, non-zero use the specified segment. char SystemType; //System Type. char Reserved1; //Unused, must be 0 unsigned short wSectorCount; //Sector Count. unsigned long dwLoadRBA; //Load RBA. CD's use Relative/Logical block addressing. char CriteriaType; //Selection criteria type. char UniqueCriteria[19]; //Vendor unique selection criteria. } BC_SECTION_ENTRY, *PBC_SECTION_ENTRY; #pragma pack(pop)
4.1 Boot media type.
This specifies what media the boot image emulates in bits 0-32.
Bits 6 and 7 are specific to the type of system.
Bits 0-3 count as follows
0 No Emulation
1 1.2 meg diskette
2 1.44 meg diskette
3 2.88 meg diskette
4 Hard Disk (drive 80)
5-F Reserved, invalid at this time
bit 4 - Reserved, must be 0
bit 5 - Continuation Entry Follows
bit 6 - Image contains an ATAPI driver
bit 7 - Image contains SCSI drivers
4.2 Selection criteria type.
This defines a vendor unique format for bytes 0D-1F.
The following formats have currently been assigned:
0 - No selection criteria
1- Language and Version Information (IBM)
2-FF - Reserved
5. Section Entry Extension
#pragma pack(push,1) typedef struct _BC_SECTION_ENTRY_EXT { char ExtInd; //Extension Indicator. must be 0x44 char Follow; //Bits 1-4:Unused, 5:1=Extension Record follows, 0=This is final Extension, 6-7:Unused char UniqueCriteria[30]; //Vendow unique selection criteria } BC_SECTION_ENTRY_EXT, *PBC_SECTION_ENTRY_EXT; #pragma pack(pop)