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Add info on file flags from Crediar's Cdecrypt source
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−
The Filesystem Table, or FST, is a file present in Wii U disk images and downloaded content that describes the folders and files contained in the image or file.
+The Filesystem Table, or FST, is a file present in Wii U disk images and downloaded content that describes the folders and files contained in the title.
It seems to be based on the Wii's FST format, but an extra header/cluster section was added.
It seems to be based on the Wii's FST format, but an extra header/cluster section was added.
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! Field !! Size !! Offset !! Description
! Field !! Size !! Offset !! Description
|-
|-
−|Magic || 4 || 0 || always "FST" and a null byte
+|Magic || 4 || 0 || always 0x46535400 ("FST" and a null byte)
|-
|-
|Secondary header size || 4 || 4 || (not sure)
|Secondary header size || 4 || 4 || (not sure)
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|Name Offset || 4 || 0 || Offset in bytes of the name of the file from the start of the nametable
|Name Offset || 4 || 0 || Offset in bytes of the name of the file from the start of the nametable
|-
|-
−|Offset || 4 || 4 || Offset in sectors of the file in its storage cluster (multiply by 32 for byte offset)
+|Offset || 4 || 4 || Offset of the file in its storage cluster: usually in sectors (multiply by 32 for byte offset); may be in bytes if the 0x4 bit in flags is set
|-
|-
|Size || 4 || 8 || Size of the file in bytes
|Size || 4 || 8 || Size of the file in bytes
|-
|-
−| Storage cluster index || 4 || 12 || this field & 0xff is an index to the list of secondary headers
+| Flags || 2 || 12 || 0x4: offset is in bytes, not sectors; 0x440: data contains SHA-1 hash
+|-
+| Storage cluster index || 2 || 14 || an index to the list of secondary headers. Additionally, for downloaded content, same as the content ID (an index into the title metadata's list of files.)
|}
|}
−If the top bits of the name offset is set (&0xff000000), then this entry is a directory
+If the top bits of the name offset is set (&0xff000000), then this entry is a directory.
−In this case, the size corresponds to the number of entries this directory contains.
+In this case, the size corresponds to the number of entries this directory contains, and the offset field corresponds to the parent directory's offset.
== Nametable ==
== Nametable ==
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== External Links ==
== External Links ==
+
+https://code.google.com/p/cdecrypt/source/browse/trunk/main.cpp - Crediar's CDecrypt tool that can parse FSTs from downloaded content
https://github.com/CarlKenner/dolphin/blob/WiiU/Source/Core/DiscIO/FileSystemWiiU.cpp - A fork of Dolphin by CarlKenner that can read WiiU disk images.
https://github.com/CarlKenner/dolphin/blob/WiiU/Source/Core/DiscIO/FileSystemWiiU.cpp - A fork of Dolphin by CarlKenner that can read WiiU disk images.
http://blog.delroth.net/2011/06/reading-wii-discs-with-python/ - some information on the Wii's FST format
http://blog.delroth.net/2011/06/reading-wii-discs-with-python/ - some information on the Wii's FST format