rlp

A pure c implementation of Recursive Length Prefix encoding (RLP). You can find the specification of the standard in the Ethereum wiki.

notice

Nested data parsing is not implemented and only support decode.

usage

1. set the RLP encoded sequence
2. convert to buffer data
3. define a decode_result variable to hold the results
4. call rlp_decode to decode
5. get the data through size

demo:

  uint8_t seq[] =
      "f889008609184e72a00082271094000000000000000000000000000000000000000000a4"
      "7f7465737432000000000000000000000000000000000000000000000000000000600057"
      "1ca05e1d3a76fbf824220eafc8c79ad578ad2b67d01b0c2425eb1f1347e8f50882aba05b"
      "d428537f05f9830e93792f90ea6a3e2d1ee84952dd96edbae9f658f831ab13";
  uint8_t buffer[(sizeof(seq)) / 2] = {0};
  hex_to_buffer(seq, sizeof(seq) - 1, buffer, (sizeof(seq) - 1) / 2);

  decode_result my_resut;
  my_resut.data = malloc(sizeof(char) * DECODE_RESULT_LEN);
  my_resut.capacity = DECODE_RESULT_LEN;
  my_resut.size = 0;

  rlp_decode(&my_resut, buffer, sizeof(buffer) / sizeof(buffer[0]));

  assert(strcmp(my_resut.data[0], "00") == 0);
  assert(strcmp(my_resut.data[1], "09184e72a000") == 0);
  assert(strcmp(my_resut.data[2], "2710") == 0);
  assert(strcmp(my_resut.data[3], "0000000000000000000000000000000000000000") == 0);
  assert(strcmp(my_resut.data[4], "00") == 0);
  assert(strcmp(my_resut.data[5], "7f7465737432000000000000000000000000000000000000000000000000000000600057") == 0);
  assert(strcmp(my_resut.data[6], "1c") == 0);

test

see test