if LZ4/ZSTD.decompress gets called with a memoryview idata, keep
it until after the super().decompress(idata) call, so we save one
copy operation just to remove the 2 bytes long compression type
header.
attic is borg's parent project, but it stalled in 2015 and was not updated since then.
guess we can assume that most attic users have meanwhile noticed this and already
converted their repos to borg.
if some did not yet, they are advised to use borg < 1.3 to do that ASAP.
note: borg can still DETECT an attic repo by recognizing its ATTIC_MAGIC value
and then gives exactly that advice.
Code gets simpler if we always only use the (shorter) header_fmt.
That format ALWAYS applies, to all tags borg writes.
If the tag unpacked from there indicates that there is also a chunkid
to read (like for PUT and DEL), we can decide that inside _read and
then read the chunkid from the fd.
olen is assigned by OpenSSL, but the compiler can't know that and generates these warnings:
warning: src/borg/crypto/low_level.pyx:271:22: local variable 'olen' referenced before assignment
warning: src/borg/crypto/low_level.pyx:274:22: local variable 'olen' referenced before assignment
warning: src/borg/crypto/low_level.pyx:314:22: local variable 'olen' referenced before assignment
warning: src/borg/crypto/low_level.pyx:317:22: local variable 'olen' referenced before assignment
warning: src/borg/crypto/low_level.pyx:514:22: local variable 'olen' referenced before assignment
warning: src/borg/crypto/low_level.pyx:517:22: local variable 'olen' referenced before assignment
warning: src/borg/crypto/low_level.pyx:566:22: local variable 'olen' referenced before assignment
warning: src/borg/crypto/low_level.pyx:572:22: local variable 'olen' referenced before assignment
added it for all classes there, so the caller just give it.
for the legacy AES-CTR based classes, the given aad is completely ignored.
this is to stay compatible with repo data of borg < 1.3.
for the new AEAD based classes:
encrypt: the aad is fed into the auth tag computation
decrypt: same. decrypt will fail on auth tag mismatch.
we already have .decrypt(id, data, ...).
i changed .encrypt(chunk) to .encrypt(id, data).
the old borg crypto won't really need or use the id,
but the new AEAD crypto will authenticate the id in future.
if we just have a pointer to a bytes object which might go out of scope, we can lose it.
also: cython can directly assign a bytes object into a same-size char array.
if we just have a pointer to a bytes object which might go out of scope, we can lose it.
also: cython can directly assign a bytes object into a same-size char array.
Thomas Waldmann