An implementation of CBOR in C

Related tags

Networking and Internet cbor rfc-8949
Overview

CBOR

This is a simple, small decoder for CBOR, the Concise Binary Object Representation. CBOR is defined by IETF RFC 8949, and Wikipedia has a good description.

Simplicity and code size are considered first.

The decoder takes 702 bytes for ARM Cortex-M0, using arm-none-eabi-gcc 10-2020-q4-major with optimization for code size -Os.

Stack usage per the major type function:

Major type Bytes
0: unsigned integer 16
1: negative integer 40
2: byte string 24
3: text string 24
4: array 8
5: map 8
6: tag(not implemented yet) 0
7: floating-point numbers, simple values and break 8

Features

  • C99
  • No dynamic allocations
  • Small memory footprint

Usage

  • CBOR_BIG_ENDIAN
  • CBOR_RECURSION_MAX_LEVEL

Decoder

struct {
	uint8_t u8_1;
	char txt[3];
	uint8_t u8_2;
} fmt;

uint8_t msg[] = { 0x83,0x01,0x63,0x61,0x62,0x63,0x03 };
cbor_decode(&fmt, sizeof(fmt), msg, sizeof(msg));

Encoder

Limitation

  • The maximum item length is size_t because the interface return type is size_t. The argument's value in the specification can go up to uint64_t though
  • A negative integer ranges down to -2^63-1 other than -2^64 in the specification
  • Tag item is not implemented yet
  • Encoder is not implemented yet
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Comments
  • Excessive Recursion - Indefinite Containers

    Excessive Recursion - Indefinite Containers

    I have tested the lib functionality using several arrays and maps with indefinite lengths. Upon parsing the created buffer, the parser gives a CBOR_EXCESSIVE error.

    During my investigation, I have found that both parse() and go_get_item_length() functions are dealing with size_t variables, whereas the indefinite length is -1. I have not found any other functions or methods to parse indefinite length containers so far.

    Please give me guidance on how to overcome this issue. Thanks!

    bug 
    opened by RidanBulwark 6
  • new cbor_encode_text_string() incompatible with C99

    new cbor_encode_text_string() incompatible with C99

    The new cbor_encode_text_string() function uses strnlen() which is a C11 function. Also, the new function no longer takes text length as a parameter. I find the old function more useful. I suggest that the library has one function takes in length as parameter and one does not. The one using strnlen() can be compiled out when C99 compiler is used.

    opened by CaryChu 1
  • Added introductory paragraph to README.

    Added introductory paragraph to README.

    As discussed on Reddit, here's a short introductory paragraph that gives context for the project.

    https://www.reddit.com/r/C_Programming/comments/ohf8tz/an_implementation_of_cbor_in_c/

    opened by kbob 1
Releases(v0.3.1)

  • v0.3.1(Dec 9, 2022)

    v0.3.1

    Features

    • Add CMake scaffolding
    • Separate base.h from cbor.h to use cbor.h as single header file with all the necessary includes
    • Add unmarshal functionality for map

    Bug Fixes

    • Fix garbage data in the uninitialized buffer when decoding
    • Fix not working break stop code on indefinite array
    Source code(tar.gz)
    Source code(zip)

  • v0.3.0(Sep 23, 2022)

    v0.3.0

    Changes

    • Breaking Change: Revert cbor_encode_text_string() to its original version
    • Add cbor_encode_null_terminated_string()
    • Fix to conform to C99 standard removing strnlen()
    • Increase the maximum recursion level from 4 to 8
    Source code(tar.gz)
    Source code(zip)

  • v0.2.0(Aug 24, 2022)

    v0.2.0

    Changes

    • Breaking Change: Change the reader and the parser initializer prototypes
      • cbor_reader_init() and cbor_parse()
      • Now a reader can be reusable to different messages
    Source code(tar.gz)
    Source code(zip)

  • v0.1.0(Aug 24, 2022)

Owner
Kyunghwan Kwon
Kyunghwan Kwon
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