This bug was a result of an annoying corner case around intermingling
signed and unsigned offsets. The boundary check that prevents seeking
a file to a position before the file was preventing valid seeks with
positive offsets.
This corner case is a bit more complicated than it looks because the
offset is signed, while the size of the file is unsigned. Simply
casting both to signed or unsigned offsets won't handle large files.
Parsing dispatch now uses a metaclass as a Trait and a series of classes
that implement the trait for dispatching parsing. This structure gives
each parser it's own namespace, avoiding tacking on suffixes to each
attribute indicating which parser uses it.
This allows minimal debugging and allows tools like
mbed-os-linker-report to work properly.
Because debugging info is kept in .elf file and not flashed to device
there is no side effects to flash sizes.
Merged from the existing TARGET_DISCO_F413ZH code (which has the same MCU)
and TARGET_NUCLEO_F412ZG code (which has the same Nucleo-144 board and
pinout).
Take SHA1 for example, without the fix, SHA H/W is not stopped in either case:
(1) ctx->total == 0 in mbedtls_sha1_hw_finish()
(2) mbedtls_sha1_hw_finish() is not called by upper layer
For example, even though MBEDTLS_SHA512_C is disabled (via #undef MBEDTLS_SHA512_C),
mbedtls_sha512_context is still necessary due to referenced in sha512.h.
Currently, trng_api.c is located in targets/ and AES/DES/SHA alter. are located in mbedtls/.
They have shared crypto code.
If they could locate at same location e.g. mbedtls/, the shared crypto code placement would be more reasonable.
Add counter to track crypto init among crypto sub-modules. It includes:
1. Enable crypto clock
2. Enable crypto interrupt
As counter gets zero, crypto clock is disabled to save power.