This is a substantial release with improvements to delta updates and destination
write handling.

There's support for writing a final block that's not a multiple of 128KB now.
The 128KB write size was a previous limitation of fwup's caching mechanism.
The limitation was mostly invisible. GPT secondary headers were adjusted rather
than being in the final blocks. If the destination wasn't a multiple of 128KB,
it wasn't possible to use the last partial block of bytes. This release changes
that. Especially if you are using GPT partitions, you may notice this change if
you are comparing disk images.

• New features

  • Support delta firmware updates of files on FAT file systems. See the
    delta-source-fat-offset and delta-source-fat-path and the unit test for
    details. Thanks to Jean Parpaillon for this feature.
  • Support writing to destinations that are not multiples of 128KB. Fwup's
    internal caching used to only write 128KB blocks. It now supports writing a
    partial final block.
  • Support writing to /dev/null (e.g., fwup -d /dev/null ...). This is useful for
    firmware updates that only use path_write and pipe_write since they
    don't need a destination. Thanks to Edoardo Rossi for the suggestion and
    patch.
  • Add --minimize-writes option. When enabled, it will check the destination
    media to see if a block really changed before writing it. This can be a
    performance improvement and remove some accidental corruption risk.
  • Support a backwards compatible shorthand for writing files to FAT
    partitions. The filename will default to the resource name. See fat_write.
  • Add --max-size option for specifying the max number of 512-blocks that
    fwup can write. Use this to force a max size when writing to a regular file
    (expandable partitions will obey this) or to reduce the allowed size on real
    media.

• Bug fixes

  • Handle out of bounds reads by xdelta3. Thanks to Arthur Crepin-Leblond for
    fixing this.

• Package updates

  • FatFS R0.15