COMP_compress_block
int COMP_compress_block(COMP_CTX *ctx, unsigned char *out, int olen,
i = COMP_compress_block(rl->compctx, wr->data,
comp_length = COMP_compress_block(comp_ctx, comp_data, max_length, data, len);
comp_len = COMP_compress_block(comp, WPACKET_get_curr(pkt), max_length,