This commit introduces the `crc8_rohc` function to the CRC library,
implementing the CRC-8/ROHC (RObust Header Compression) variant.
This algorithm is widely used in networking protocols, which is commonly
found in modem subsystems.
Signed-off-by: Pisit Sawangvonganan <pisit@ndrsolution.com>
Add missing braces to comply with MISRA C:2012 Rule 15.6 and
also following Zephyr's style guideline.
Signed-off-by: Pisit Sawangvonganan <pisit@ndrsolution.com>
Use `do { ... } while (false)' instead of `do { ... } while (0)'.
Use comparisons with zero instead of implicitly testing integers.
Use comparisons with NULL instead of implicitly testing pointers.
Use comparisons with NUL instead of implicitly testing plain chars.
Use `bool' instead of `int' to represent Boolean values.
Use `while (true)' instead of `while (1)' to express infinite loops.
Signed-off-by: frei tycho <tfrei@baumer.com>
The functions fnmatch(), getopt(), getentropy()
and others are grouped into the standard Option Group
POSIX_C_LIB_EXT.
The getentropy() function is currently in-draft for
Issue 8 as of 2021.
https://www.opengroup.org/austin/docs/austin_1110.pdf
Not surprisingly, the POSIX_C_LIB_EXT Option Group
also includes the highly debated strnlen() function.
Moving that function will be deferred until later.
Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
Added CRC4 and CRC4_TI to the supported crc_types[] array.
On some SoCs, like ESP32-S3, missing values can cause hardfaults
due to attempts to access the zero address.
Signed-off-by: Pisit Sawangvonganan <pisit@ndrsolution.com>
Add two new functions: crc4 for generic calculations
of CRC4, and crc4_ti which use look-up table for
faster calculations of CRC4 algortihms that base
on 0x03 polynomial.
Signed-off-by: Michal Morsisko <morsisko@gmail.com>
lib/ was starting to get messy and inconsitent. Files being either
dumped in the root or in sub-directories without a clear plan.
Move all library components into one single folder and call it 'os'.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Used as a checksum on command messages when talking with MMC cards.
Implemented using the unwound bytewise implementation from
https://en.wikipedia.org/wiki/Computation_of_cyclic_redundancy_checks
which is a good mix of size and speed.
The API and naming matches lib/crc7.c in Linux.
Signed-off-by: Michael Hope <mlhx@google.com>
This is a minor change that makes the data pointer const and shifts
the length to a size_t to match the other CRC functions.
Signed-off-by: Michael Hope <mlhx@google.com>
The existing version of crc16_ccitt() is actually CRC-16/AUG-CCITT and
gives different results to Linux, Contiki, and the CRC unit in the
SAM0 SOC. This version matches Linux.
Note that this is an incompatible API change.
Signed-off-by: Michael Hope <mlhx@google.com>
