rust-squashfs

A pure rust implement of squashfs library.

Roadmap

• Parse squashfs Superblock.
• Parse fragment table.
• Parse xattrs table.
• Parse uid/gid lookup table.
• Parse inode table.
• Parse directory table.
• Parse export table.
• Multiple Compressors:
  • gzip algorithm.
  • lzma algorithm.
  • lzo algorithm.
  • xz algorithm.
  • lz4 algorithm.
  • zstd algorithm.

lib.rs:

squashfs layout

A squashfs filesystem consists of a maximum of nine parts, packed together on a byte alignment:

 ---------------
|  superblock   |
|---------------|
|  compression  |
|    options    |
|---------------|
|  datablocks   |
|  & fragments  |
|---------------|
|  inode table  |
|---------------|
|   directory   |
|     table     |
|---------------|
|   fragment    |
|    table      |
|---------------|
|    export     |
|    table      |
|---------------|
|    uid/gid    |
|  lookup table |
|---------------|
|     xattr     |
|     table     |
 ---------------

References

• https://www.kernel.org/doc/Documentation/filesystems/squashfs.txt
• https://dr-emann.github.io/squashfs/