Revisit the API

[vrancurel]

Use a codec style API:

• Codec_init
• Add_buf
• Finalize

The lib shall split the buffers acc/to the parameters of the code (type of code, k, m, stride, word_size, etc)

[vrancurel]

@slaperche-scality can you make a suggestion of an API and we will iterate over it ?

[vrancurel]

API Proposal

void init(int k, int m);

void destroy();

int encode(char **data, char **parity, uint32_t block_size);

int decode(char **data, char **parity, int *missing_idxs, int block_size);

int fragsneeded(int *missing_idxs, int *fragments_to_exclude, int *fragments_needed);

int reconstruct(char **data, char **parity, int *missing_idxs, int destination_idx, int block_size);

Some remarks and questions @lamphamsy and @slaperche-scality

• Inspired from https://github.com/tsg-/liberasurecode. The goal is eventually to write a backend.
• Liberasurecode already manages checksums and headers on top of fragments. Do we need to re-manage this at our level ?
• We shall also be independent from liberasure code.
• We have also different sub-types of codes and ideally have a combo of different sub-types.
• We could leverage our props system for our own headers.