[2312] Added the method to return number of option data field.

src/lib/dhcp/option_custom.h

@@ -64,6 +64,11 @@ public:
     OptionCustom(const OptionDefinition& def, Universe u,
                  OptionBufferConstIter first, OptionBufferConstIter last);
 
+    /// @brief Return a number of the data fields.
+    ///
+    /// @return number of data fields held by the option.
+    uint32_t getDataFieldsNum() const { return (buffers_.size()); }
+
     /// @brief Read a buffer as IP address.
     ///
     /// @param index buffer index.

src/lib/dhcp/tests/option_custom_unittest.cc

@@ -118,6 +118,9 @@ TEST_F(OptionCustomTest, emptyData) {
         option.reset(new OptionCustom(opt_def, Option::V4, OptionBuffer()));
     );
     ASSERT_TRUE(option);
+
+    // Option is 'empty' so no data fields are expected.
+    EXPECT_EQ(0, option->getDataFieldsNum());
 }
 
 // The purpose of this test is to verify that the option definition comprising
@@ -142,6 +145,9 @@ TEST_F(OptionCustomTest, binaryData) {
     );
     ASSERT_TRUE(option);
 
+    // We should have just one data field.
+    ASSERT_EQ(1, option->getDataFieldsNum());
+
     // The custom option should hold just one buffer that can be
     // accessed using index 0.
     OptionBuffer buf_out;
@@ -172,6 +178,9 @@ TEST_F(OptionCustomTest, booleanData) {
     );
     ASSERT_TRUE(option);
 
+    // We should have just one data field.
+    ASSERT_EQ(1, option->getDataFieldsNum());
+
     // Initialize the value to true because we want to make sure
     // that it is modified to 'false' by readBoolean below.
     bool value = true;
@@ -198,6 +207,9 @@ TEST_F(OptionCustomTest, int16Data) {
     );
     ASSERT_TRUE(option);
 
+    // We should have just one data field.
+    ASSERT_EQ(1, option->getDataFieldsNum());
+
     // Initialize value to 0 explicitely to make sure that is
     // modified by readInteger function to expected -234.
     int16_t value = 0;
@@ -221,6 +233,9 @@ TEST_F(OptionCustomTest, ipv4AddressData) {
     );
     ASSERT_TRUE(option);
 
+    // We should have just one data field.
+    ASSERT_EQ(1, option->getDataFieldsNum());
+
     IOAddress address("127.0.0.1");
     // Read IPv4 address from using index 0.
     ASSERT_NO_THROW(option->readAddress(0, address));
@@ -244,6 +259,9 @@ TEST_F(OptionCustomTest, ipv6AddressData) {
     );
     ASSERT_TRUE(option);
 
+    // We should have just one data field.
+    ASSERT_EQ(1, option->getDataFieldsNum());
+
     // Custom option should comprise exactly one buffer that represents
     // IPv6 address.
     IOAddress address("::1");
@@ -269,6 +287,9 @@ TEST_F(OptionCustomTest, stringData) {
     );
     ASSERT_TRUE(option);
 
+    // We should have just one data field.
+    ASSERT_EQ(1, option->getDataFieldsNum());
+
     // Custom option should now comprise single string value that
     // can be accessed using index 0.
     std::string value;
@@ -298,6 +319,9 @@ TEST_F(OptionCustomTest, booleanDataArray) {
     );
     ASSERT_TRUE(option);
 
+    // We should have 5 data fields.
+    ASSERT_EQ(5, option->getDataFieldsNum());
+
     // Read values from custom option using indexes 0..4 and
     // check that they are valid.
     bool value0 = false;
@@ -350,6 +374,9 @@ TEST_F(OptionCustomTest, uint32DataArray) {
     );
     ASSERT_TRUE(option);
 
+    // We should have 3 data fields.
+    ASSERT_EQ(3, option->getDataFieldsNum());
+
     // Expect only 3 values.
     for (int i = 0; i < 3; ++i) {
         uint32_t value = 0;
@@ -382,6 +409,9 @@ TEST_F(OptionCustomTest, ipv4AddressDataArray) {
     );
     ASSERT_TRUE(option);
 
+    // We should have 3 data fields.
+    ASSERT_EQ(3, option->getDataFieldsNum());
+
     // We expect 3 IPv4 addresses being stored in the option.
     for (int i = 0; i < 3; ++i) {
         IOAddress address("10.10.10.10");
@@ -410,10 +440,13 @@ TEST_F(OptionCustomTest, ipv6AddressDataArray) {
     // Use the input buffer to create custom option.
     boost::scoped_ptr<OptionCustom> option;
     ASSERT_NO_THROW(
-        option.reset(new OptionCustom(opt_def, Option::V6, buf.begin(), buf.begin() + 70));
+        option.reset(new OptionCustom(opt_def, Option::V6, buf.begin(), buf.begin() + 50));
     );
     ASSERT_TRUE(option);
 
+    // We should have 3 data fields.
+    ASSERT_EQ(3, option->getDataFieldsNum());
+
     // We expect 3 IPv6 addresses being stored in the option.
     for (int i = 0; i < 3; ++i) {
         IOAddress address("fe80::4");
@@ -453,6 +486,9 @@ TEST_F(OptionCustomTest, recordData) {
     );
     ASSERT_TRUE(option);
 
+    // We should have 5 data fields.
+    ASSERT_EQ(5, option->getDataFieldsNum());
+
     // Verify value in the field 0.
     uint16_t value0 = 0;
     ASSERT_NO_THROW(value0 = option->readInteger<uint16_t>(0));
@@ -571,6 +607,9 @@ TEST_F(OptionCustomTest, unpack) {
     );
     ASSERT_TRUE(option);
 
+    // We should have 3 data fields.
+    ASSERT_EQ(3, option->getDataFieldsNum());
+
     // We expect 3 IPv4 addresses being stored in the option.
     for (int i = 0; i < 3; ++i) {
         IOAddress address("10.10.10.10");
@@ -595,6 +634,9 @@ TEST_F(OptionCustomTest, unpack) {
     // Perform 'unpack'.
     ASSERT_NO_THROW(option->unpack(buf.begin(), buf.end()));
 
+    // Now we should have only 2 data fields.
+    ASSERT_EQ(2, option->getDataFieldsNum());
+
     // Verify that the addresses have been overwritten.
     for (int i = 0; i < 2; ++i) {
         IOAddress address("10.10.10.10");
@@ -624,10 +666,13 @@ TEST_F(OptionCustomTest, setData)
     // Use the input buffer to create custom option.
     boost::scoped_ptr<OptionCustom> option;
     ASSERT_NO_THROW(
-        option.reset(new OptionCustom(opt_def, Option::V6, buf.begin(), buf.begin() + 70));
+        option.reset(new OptionCustom(opt_def, Option::V6, buf.begin(), buf.begin() + 50));
     );
     ASSERT_TRUE(option);
 
+    // We should have 3 data fields.
+    ASSERT_EQ(3, option->getDataFieldsNum());
+
     // We expect 3 IPv6 addresses being stored in the option.
     for (int i = 0; i < 3; ++i) {
         IOAddress address("fe80::4");
@@ -651,6 +696,9 @@ TEST_F(OptionCustomTest, setData)
     // Replace the option data.
     ASSERT_NO_THROW(option->setData(buf.begin(), buf.end()));
 
+    // Now we should have only 2 data fields.
+    ASSERT_EQ(2, option->getDataFieldsNum());
+
     // Check that it has been replaced.
     for (int i = 0; i < 2; ++i) {
         IOAddress address("10.10.10.10");