Difference between revisions of "ExeFS"
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==== File hashes ==== | ==== File hashes ==== | ||
Each file header has a corresponding file hash, which is the SHA256 hash calculated over the entire file contents. | Each file header has a corresponding file hash, which is the SHA256 hash calculated over the entire file contents. | ||
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Revision as of 18:03, 8 June 2012
Overview
ExeFS or Executable Filesystem, is the part of the CXI, which contains information related to the executable program.
The ExeFS usually contains one or more of the following files:
- .code Contains the code binary, which can be optionally reverse-LZSS compressed via an exheader flag.
- .logo Contains distribution licensing Binary data.
- .banner Contains the banner which homemenu uses for this CXI.
- .icon Contains the icon which homemenu displays for this CXI.
Format
The ExeFS header is 0x200 bytes long and follows this simple structure:
| START | SIZE | DESCRIPTION |
|---|---|---|
| 0x00 | 0x80 | File headers (8 headers maximum, 16 bytes each) |
| 0x80 | 0x80 | Reserved |
| 0x100 | 0x100 | File hashes (8 hashes maximum, 32 bytes each, one for each header) |
File headers
There are a maximum of 8 file headers in the ExeFS format, which have the following structure:
| START | SIZE | DESCRIPTION |
|---|---|---|
| 0x0 | 0x8 | File name |
| 0x8 | 0x4 | File offset |
| 0xC | 0x4 | File size |
File offsets are non-inclusive of the header's size (0x200 bytes). Also, file headers which are not used are filled with all zeros.
File hashes
Each file header has a corresponding file hash, which is the SHA256 hash calculated over the entire file contents.