add conversion for byte to/from unsigned (bigint) datatype

Signed-off-by: Siebren Weertman <[email protected]>

Author: Siebren Weertman

src/input/code_templates/c/static_code/exi_basetypes.c.jinja

@@ -133,4 +133,65 @@ int exi_basetypes_convert_64_from_signed(exi_signed_t* exi_signed, int64_t* valu
     *value = (exi_signed->is_negative == 0) ? uValue : -uValue;
     return res;
 }
+
+int exi_basetypes_convert_bytes_from_unsigned(const exi_unsigned_t* exi_unsigned, uint8_t* data, size_t* data_len, size_t data_size)
+{    
+    const uint8_t* current_octet = exi_unsigned->octets;
+    uint16_t temp = 0;
+    *data_len = 0;
+    size_t total_offset = 0;
+
+    for (size_t n = 0; n < exi_unsigned->octets_count; n++) {
+        temp = temp + ((uint16_t)(*current_octet & EXI_BASETYPES_OCTET_SEQ_VALUE_MASK) << (total_offset));
+        total_offset += 7;
+        if (total_offset >= 8) {
+            if (data_size == *data_len) {
+                return -1;
+            }
+            total_offset -= 8;
+            data[(*data_len)++] = temp & 0xFF;
+            temp >>= 8;
+        }
+        current_octet++;
+    }
+    if (total_offset != 0) {
+        if (data_size == *data_len) {
+            return -1;
+        }
+        data[(*data_len)++] = temp & 0xFF;
+    }
+    return 0;
+}
+
+int exi_basetypes_convert_bytes_to_unsigned(exi_unsigned_t* exi_unsigned, const uint8_t* data, size_t data_len)
+{
+    uint8_t *current_octet = &exi_unsigned->octets[0];
+    uint16_t dummy;
+    uint8_t dummy_count = 0;
+
+    for (size_t n = 0; n != data_len; n++, current_octet++) {
+        if (dummy_count <= 8) {
+            dummy = dummy | ((data[n]) << dummy_count);
+            dummy_count += 8;
+        }
+        fmt::print("dummy {}\n", dummy);
+        exi_unsigned->octets_count++;
+        *current_octet = (uint8_t)(dummy & EXI_BASETYPES_OCTET_SEQ_VALUE_MASK);
+
+        dummy = dummy >> 7u;
+        dummy_count -= 7;
+        if (n == data_len) {
+            break;
+        }
+
+        *current_octet |= EXI_BASETYPES_OCTET_SEQ_FLAG_MASK;
+    }
+    if (dummy_count > 0) {
+        *(current_octet-1) |= EXI_BASETYPES_OCTET_SEQ_FLAG_MASK;
+        exi_unsigned->octets_count++;
+        *current_octet = (uint8_t)(dummy & EXI_BASETYPES_OCTET_SEQ_VALUE_MASK);
+    }
+    return 0;
+}
+
 {% endblock %}

src/input/code_templates/c/static_code/exi_basetypes.h.jinja

@@ -59,4 +59,7 @@ int exi_basetypes_convert_64_to_signed(exi_signed_t* exi_signed, int64_t value);
 
 int exi_basetypes_convert_from_signed(exi_signed_t* exi_unsigned, int32_t* value, size_t max_octets);
 int exi_basetypes_convert_64_from_signed(exi_signed_t* exi_unsigned, int64_t* value);
+
+int exi_basetypes_convert_bytes_from_unsigned(const exi_unsigned_t* exi_unsigned, uint8_t* data, size_t* data_len, size_t data_size);
+int exi_basetypes_convert_bytes_to_unsigned(exi_unsigned_t* exi_unsigned, const uint8_t* data, size_t data_len);
 {% endblock %}