Unsigned little endian base 128 (ULEB128) implementation, which stores arbitrarily large unsigned integers in a variable length format. This library is compatible with Arduino ARM and with CMake build systems. It would also be easy to include with other projects, since it is a header only library consisting of a single file.
Use the Arduino Library Manager to install this library or clone to your Arduino/libraries folder. This library is added as:
#include "uleb128.h"An example Arduino executable is located at examples/arduino/uleb128_example/uleb128_example.ino. Teensy 3.x, 4.x, and LC devices are used for testing under Arduino and this library should be compatible with other ARM devices. This library is not expected to work on AVR devices.
CMake is used to build this library, which is exported as a library target called uleb128. The header is added as:
#include "uleb128.h"The library can be also be compiled stand-alone using the CMake idiom of creating a build directory and then, from within that directory issuing:
cmake ..
make
This will build the library, an example executable called uleb128_example, and an executable for testing using the Google Test framework, called uleb128_test. The example executable source file is located at examples/cmake/uleb128_example.cc.
This library is within the namespace bfs.
std::size_t EncodeUleb128(int64_t val, uint8_t * const data, const std::size_t len) Encodes a uint64_t val into a ULEB128 variable length format stored in the array data of length len. Returns the number of bytes written if successful, otherwise, returns 0.
std::size_t DecodeUleb128(uint8_t const * const data, const std::size_t len, int64_t * const val) Decodes a ULEB128 variable length value from the array data of length len into a uint64_t variable val. Returns the number of bytes read if successful, otherwise, returns 0.
uint8_t buf[100];
uint64_t read_val = 0;
uint64_t orig_val = std::numeric_limits<uint64_t>::max();
std::size_t bytes_written = bfs::EncodeUleb128(orig_val, buf, sizeof(buf));
std::size_t bytes_read = bfs::DecodeUleb128(buf, sizeof(buf), &read_val);