For some reason, this is partition.Start + Location (288 + 32) = 320.Īt block 320 we find the FSD. I use the "metadata main file" location (here, 32) as an indirect pointer to where to "really" look for the FSD. There is also possible to find a filetype=251 (metadata mirror file) The Ecma-167 defines filetype=250 has "metadata main file", and the AD.Location points to the metadata. Metadata Main at location 32 (+partition.start 320) Looking for the FSD now, the first item we find is: * Read Block 288 which is 266 TAGID_EXTFENTRY This appears to work even with examples where "metadata main file location" is not 0. You can see I take the "metadata main file location", in this example 0, and add it to the partition start, to go look for the FSD. Starting scan from 288 (metadata adjusted) Metadata Partition MainLoc 00000000, MirrorLoc 0022F5A9, BitmapLoc FFFFFFFF, AllocSize 00000020, AlignSize 0020, Flags 1. Partition identifier: '*UDF Metadata Partition' Partiton: number 0, start 288, length 2291200, AccessType 1
* Read Block 34 which is 5 TAGID_PARTITION So we start to read the ISO image * Read Block 256 which is 2 TAGID_ANCHOR The blocks are laid out as: Block 32 TagID: 1 TAGID_PRI_VOL So, first, let's look at an ISO image from IMGBURN, which appears to work, just the same as an image copied from a retail bluray. I have read both Ecma-167, and udf260 PDF files, lots.
Udf file system reader how to#
It is more on HOW to read UDF file systems. But the specific implementation is not so important in this case. I am currently using the trusty, but not very accurate, libdvdread library to read ISO files/devices.
But maybe there is someone out there who has done this before. So this might be a little too specific, and too much for anyone to read, for anyone to be able to help.
0 kommentar(er)
