This supports all features of Android sparse images, including holes,
and CRC32 (both full image checksum and CRC32 chunks).
Partial sparse images, like those included in GrapheneOS' new optimized
factory images, can also be packed and unpacked with these new commands,
unlike AOSP's simg2img and img2simg tools.
This new functionality is not relevant for avbroot's main use case, but
is useful for unpacking certain factory images for comparison with OTAs
during troubleshooting.
Signed-off-by: Andrew Gunnerson <accounts+github@chiller3.com>
This supports both empty and normal LP images, including those that span
multiple files/devices.
Currently, repacked files are semantically equivalent, but not exactly
identical. avbroot's data structure for the metadata does not preserve
the arbitrary partition ordering of the LP image. Instead, to make the
API a bit nicer, it only preserves the relative partition ordering
within partition groups.
Signed-off-by: Andrew Gunnerson <accounts+github@chiller3.com>
This is still not the ideal API, but it makes the code quite a bit more
readable since we no longer have to pass around closures everywhere that
multithreaded reads and writes to the same file are needed.
Signed-off-by: Andrew Gunnerson <accounts+github@chiller3.com>
The Magisk boot image patcher still reads all the entries into memory
for simplicity, but everything else now uses the streaming reader.
Signed-off-by: Andrew Gunnerson <accounts+github@chiller3.com>
This initially includes fuzzers for the AVB and boot image parsers. The
initial input corpus are the same test files we use for the round trip
tests.
Issue: #160
Signed-off-by: Andrew Gunnerson <accounts+github@chiller3.com>
Andrew Gunnerson