Which file system is this? file type 0x00, folder type 0x01

Question

Inside a internet radio firmware file I found a file system, and I don't know which one it is.

What I know:

• (The first two bytes are 0A 4C (maybe magic byte))
  • they are actually not part of the file system data
• Now 4 bytes with the length of the index
• Entries in the index begin with a type of 1 byte:
  • type 00: File
    • 1 byte file name length
    • x bytes with the file name
    • 4 bytes file length
    • 4 bytes offset of the data in the file system
    • 4 bytes (unknown usage)
  • type 01: Folder
    • 1 byte folder name length
    • x bytes with the folder name (root folder name is 0 bytes)
    • 1 byte: number of entries/files in that folder

All offsets and lengths are little endian.

What file system could that be? I don't think that the developers built their own file system.

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The firmware file is from http://update.wifiradiofrontier.com/Update.aspx?c=ir-mmi-FS2026-0500-0052&m=1122334455&v=2.6.17.EX53300-2RC3&t=Cust-File&n=2.11.12.EX65933-4RC2&f=/updates/ir-mmi-FS2026-0500-0052.2.11.12.EX65933-4RC2.isu.bin

binwalk does not detect the filesystem.

The file system I mean starts at 0x1dc1e6. I already wrote a working parser for that file system, but I'd like to know if that is a known fs type.

Answer 1

It does not sound like a well-known file system. Probably it is just something custom the programmers came up with for this project.