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Improvements about the block address of empty data files

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This commit is contained in:
Thomas Schmitt
2010-11-25 14:40:44 +01:00
parent b2997dcc46
commit 5482d5d7b4
6 changed files with 28 additions and 44 deletions
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42
doc/boot_sectors.txt
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@ -258,7 +258,7 @@ Sources:
The candidates for MBR booting will normally use El Torito rather than MBR
if the ISO image is presented on CD, DVD, or BD media.
The eventual MBR comes into effect it the image is on a media that is
The eventual MBR comes into effect if the image is on a media that is
interpreted by the BIOS as some kind of hard disk. Usually real hard disks,
floppy disks, USB sticks, memory cards.
@ -526,46 +526,6 @@ Byte Range | Value | Meaning
up to 2048 | 0 | ISO 9660 Block end padding
---------- | ---------- | ----------------------------------------------------
Test image produced by
genisoimage -o /u/test/mips_boot.iso -mips-boot checksum.c jte
which reports
Found mips boot image checksum.c, using extent 636 (0x27C), #blocks 14336 (0x3800)
xorriso reports as 2048 byte LBA of the boot image dummy file
File data lba: 0 , 159 , 7 , 14330 , '/CHECKSUM.C'
First 512 bytes in hex:
0 : 0b e5 a9 41 00 00 00 00 00 00 00 00 00 00 00 00
16 : 00 00 00 00 00 00 00 00 00 00 00 00 00 51 00 00
32 : 00 01 00 00 00 00 00 20 02 00 00 00 00 00 00 34
48 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
64 : 00 00 00 00 00 00 00 00 63 68 65 63 6b 73 75 6d
80 : 00 00 02 7c 00 00 38 00 00 00 00 00 00 00 00 00
... 0 ...
400 : 00 00 00 00 00 00 00 00 00 00 0a 28 00 00 00 00
416 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
432 : 00 00 0a 28 00 00 00 00 00 00 00 06 00 00 00 00
... 0 ...
496 : 00 00 00 00 00 00 00 00 22 ec 2c c9 00 00 00 00
The 32 bit two's complement of bytes 0 to 503 is 0x22ec2cc9.
In decimal:
0 : 11 229 169 65 0 0 0 0 0 0 0 0 0 0 0 0
16 : 0 0 0 0 0 0 0 0 0 0 0 0 0 81 0 0
32 : 0 1 0 0 0 0 0 32 2 0 0 0 0 0 0 52
48 : 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
64 : 0 0 0 0 0 0 0 0 99 104 101 99 107 115 117 109
80 : 0 0 2 124 0 0 56 0 0 0 0 0 0 0 0 0
... 0 ...
400 : 0 0 0 0 0 0 0 0 0 0 10 40 0 0 0 0
416 : 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
432 : 0 0 10 40 0 0 0 0 0 0 0 6 0 0 0 0
... 0 ...
496 : 0 0 0 0 0 0 0 0 34 236 44 201 0 0 0 0
Cleartext part:
64 : c h e c k s u m
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