feat(datastore): add getter for uint8_t

common/datastore/CDataStore.cpp

@@ -8,6 +8,22 @@ void CDataStore::DetachBuffer(void** data, uint32_t* size, uint32_t* alloc) {
     // TODO
 }
 
+int32_t CDataStore::FetchRead(uint32_t pos, uint32_t bytes) {
+    if (pos + bytes <= this->m_size) {
+        if (pos >= this->m_base && pos + bytes <= this->m_base + this->m_alloc) {
+            return 1;
+        }
+
+        if (this->InternalFetchRead(pos, bytes, this->m_data, this->m_base, this->m_alloc)) {
+            return 1;
+        }
+    }
+
+    this->m_read = this->m_size + 1;
+
+    return 0;
+}
+
 int32_t CDataStore::FetchWrite(uint32_t pos, uint32_t bytes, const char* fileName, int32_t lineNumber) {
     if (pos >= this->m_base && pos + bytes <= this->m_base + this->m_alloc) {
         return 1;
@@ -26,6 +42,20 @@ void CDataStore::Finalize() {
     this->m_read = 0;
 }
 
+CDataStore& CDataStore::Get(uint8_t& val) {
+    STORM_ASSERT(this->IsFinal());
+
+    if (this->FetchRead(this->m_read, 1)) {
+        auto ofs = this->m_read - this->m_base;
+        auto ptr = &this->m_data[ofs];
+        val = *reinterpret_cast<uint8_t*>(ptr);
+
+        this->m_read += sizeof(val);
+    }
+
+    return *this;
+}
+
 void CDataStore::GetBufferParams(const void** data, uint32_t* size, uint32_t* alloc) const {
     if (data) {
         *data = this->m_data;

common/datastore/CDataStore.hpp

@@ -27,7 +27,9 @@ class CDataStore {
     virtual uint32_t GetHeaderSpace();
 
     // Member functions
+    int32_t FetchRead(uint32_t pos, uint32_t bytes);
     int32_t FetchWrite(uint32_t pos, uint32_t bytes, const char* fileName, int32_t lineNumber);
+    CDataStore& Get(uint8_t& val);
     CDataStore& GetDataInSitu(void*& val, uint32_t bytes);
     int32_t IsFinal();
     CDataStore& Put(uint8_t val);

test/DataStore.cpp

@@ -7,3 +7,17 @@ TEST_CASE("CDataStore::CDataStore", "[datastore]") {
         SUCCEED();
     }
 }
+
+TEST_CASE("CDataStore::Get", "[datastore]") {
+    SECTION("gets uint8_t") {
+        uint8_t writeVal = 8;
+        uint8_t readVal = -1;
+
+        CDataStore msg;
+        msg.Put(writeVal);
+        msg.Finalize();
+        msg.Get(readVal);
+
+        REQUIRE(readVal == writeVal);
+    }
+}