storage: encryption: Add deep copy function for storage encryption

src/util/virstorageencryption.c

@@ -66,6 +66,46 @@ virStorageEncryptionFree(virStorageEncryptionPtr enc)
     VIR_FREE(enc);
 }
 
+static virStorageEncryptionSecretPtr
+virStorageEncryptionSecretCopy(const virStorageEncryptionSecret *src)
+{
+    virStorageEncryptionSecretPtr ret;
+
+    if (VIR_ALLOC(ret) < 0)
+        return NULL;
+
+    memcpy(ret, src, sizeof(*src));
+
+    return ret;
+}
+
+virStorageEncryptionPtr
+virStorageEncryptionCopy(const virStorageEncryption *src)
+{
+    virStorageEncryptionPtr ret;
+    size_t i;
+
+    if (VIR_ALLOC(ret) < 0)
+        return NULL;
+
+    if (VIR_ALLOC_N(ret->secrets, src->nsecrets) < 0)
+        goto error;
+
+    ret->nsecrets = src->nsecrets;
+    ret->format = src->format;
+
+    for (i = 0; i < src->nsecrets; i++) {
+        if (!(ret->secrets[i] = virStorageEncryptionSecretCopy(src->secrets[i])))
+            goto error;
+    }
+
+    return ret;
+
+ error:
+    virStorageEncryptionFree(ret);
+    return NULL;
+}
+
 static virStorageEncryptionSecretPtr
 virStorageEncryptionSecretParse(xmlXPathContextPtr ctxt,
                                 xmlNodePtr node)

src/util/virstorageencryption.h

@@ -61,6 +61,9 @@ struct _virStorageEncryption {
     virStorageEncryptionSecretPtr *secrets;
 };
 
+virStorageEncryptionPtr virStorageEncryptionCopy(const virStorageEncryption *src)
+    ATTRIBUTE_NONNULL(1);
+
 void virStorageEncryptionFree(virStorageEncryptionPtr enc);
 
 virStorageEncryptionPtr virStorageEncryptionParseNode(xmlDocPtr xml,