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Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible
From: |
Thomas Schmitt |
Subject: |
Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB |
Date: |
Fri, 13 Jul 2018 12:00:14 +0200 |
Hi,
something to laugh for Pete, and to moan for Linux users:
The handling of multiextent files with unaligned extent sizes is
obviously broken in the Linux kernel. At least in versions 3.16 and 4.12.
I changed in my test ISO image multi_extent_8k.iso the size field
of the fifth directory record of the data file from 8192 to 7936.
This leaves a gap of 256 bytes to the start of the sixth extent.
Where libisofs and libcdio branch ts-multiextent skip only 256 bytes,
the Linux kernel skips more and in the end adds 1792 zero-bytes to get
to the correct file length.
The difference begins at byte 38912 = 19 * 2048. So four extents are
presented correctly, but the incomplete last block in the manipulated
extent is ignored completely by Linux.
This leads in the end to the presentation of 1792 = 2048 - 256 bytes which
do not belong to the payload of the file.
(I really would like to quit this second-class operating system if i
only knew any first-class one.)
Have a nice day :)
Thomas
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, (continued)
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Pete Batard, 2018/07/09
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Thomas Schmitt, 2018/07/09
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Pete Batard, 2018/07/09
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Thomas Schmitt, 2018/07/09
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Pete Batard, 2018/07/09
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Thomas Schmitt, 2018/07/10
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Rocky Bernstein, 2018/07/10
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Pete Batard, 2018/07/10
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Thomas Schmitt, 2018/07/10
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Thomas Schmitt, 2018/07/11
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB,
Thomas Schmitt <=
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Pete Batard, 2018/07/09
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Thomas Schmitt, 2018/07/09
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Rocky Bernstein, 2018/07/09
- Re: [Libcdio-devel] [RFC] New API iso9660_statv2_t as API/ABI compatible way to read files >= 4 GiB, Thomas Schmitt, 2018/07/10