[+] append sign to datum

modules/common/dap_chain_datum_token.c

@@ -455,6 +455,39 @@ dap_chain_datum_token_emission_t *dap_chain_datum_emission_add_sign(dap_enc_key_
     return l_ret;
 }
 
+dap_chain_datum_token_emission_t *dap_chain_datum_emission_append_sign(dap_sign_t  *a_sign, dap_chain_datum_token_emission_t *a_emission)
+{
+    if (!a_emission || a_emission->hdr.type != DAP_CHAIN_DATUM_TOKEN_EMISSION_TYPE_AUTH)
+        return NULL;
+
+    if (!a_sign)
+        return NULL;
+
+    if (a_emission->data.type_auth.size > a_emission->data.type_auth.tsd_total_size)
+    {
+        dap_sign_t *l_sign = (dap_sign_t *)(a_emission->tsd_n_signs + a_emission->data.type_auth.tsd_total_size);
+        for (int i = 0; i < a_emission->data.type_auth.signs_count; i++) {
+            if (l_sign->header.sign_pkey_size == a_sign->header.sign_pkey_size &&
+                !memcmp(l_sign->pkey_n_sign, a_sign->pkey_n_sign, l_sign->header.sign_pkey_size)) {
+
+                log_it(L_ERROR, "such singature present");
+                return a_emission;  // this sign already exists
+            }
+            l_sign = (dap_sign_t *)((byte_t *)l_sign + dap_sign_get_size(l_sign));
+        }
+    }
+
+    size_t l_emission_size = dap_chain_datum_emission_get_size((uint8_t *)a_emission);
+    dap_chain_datum_token_emission_t *l_ret = DAP_REALLOC(a_emission, l_emission_size + dap_sign_get_size(a_sign));
+    size_t l_sign_size = dap_sign_get_size(a_sign);
+    memcpy(l_ret->tsd_n_signs + l_ret->data.type_auth.size, a_sign, l_sign_size);
+    
+    l_ret->data.type_auth.size += l_sign_size;
+    l_ret->data.type_auth.signs_count++;
+    return l_ret;
+}
+
+
 dap_sign_t *dap_chain_datum_emission_get_signs(dap_chain_datum_token_emission_t *a_emission, size_t *a_signs_count) {
     if (!a_emission || !a_signs_count || a_emission->hdr.type != DAP_CHAIN_DATUM_TOKEN_EMISSION_TYPE_AUTH) {
         log_it(L_ERROR, "Parameters must be not-null!");

modules/common/include/dap_chain_datum_token.h

@@ -511,6 +511,8 @@ byte_t *dap_chain_emission_get_tsd(dap_chain_datum_token_emission_t *a_emission,
 dap_chain_datum_token_emission_t *dap_chain_datum_emission_read(byte_t *a_emission_serial, size_t *a_emission_size);
 size_t dap_chain_datum_emission_get_size(uint8_t *a_emission_serial);
 dap_chain_datum_token_emission_t *dap_chain_datum_emission_add_sign(dap_enc_key_t *a_sign_key, dap_chain_datum_token_emission_t *a_emission);
+dap_chain_datum_token_emission_t *dap_chain_datum_emission_append_sign(dap_sign_t  *a_sign, dap_chain_datum_token_emission_t *a_emission);
+
 dap_sign_t *dap_chain_datum_emission_get_signs(dap_chain_datum_token_emission_t *a_emission, size_t *a_signs_count);
 // 256 TYPE
 bool dap_chain_datum_token_is_old(uint8_t a_type);