lib/file: Implement modify functions

src/lib/file.cpp

@@ -186,6 +186,53 @@ ErrorOrVoid File::insertByte(uint8_t byte){
         readData.insert(readData.begin()+this->cursorPosition, byte);
         this->fileStream.seekg(0);
         this->write(readData);
+        this->cursorPosition++;
+        
+    }catch(std::exception& e){
+        failure = true;
+    }
+    return failure ? ErrorOrVoid(true, ErrorCodes::UNKNOWN) : ErrorOrVoid();
+}
+
+
+ErrorOrVoid File::insert(std::vector<uint8_t> data){
+    bool failure = false;
+
+    try{
+        uint8_t* buffer = new uint8_t[this->size.value];
+        std::vector<uint8_t> readData;
+
+        this->fileStream.read(reinterpret_cast<char*>(buffer), this->size.value);
+        readData = std::vector<uint8_t>(buffer, buffer+this->size.value);
+
+        readData.insert(readData.begin()+this->cursorPosition, data.begin(), data.end());
+        this->fileStream.seekg(0);
+        this->write(readData);
+        this->cursorPosition += data.size();
+        
+    }catch(std::exception& e){
+        failure = true;
+    }
+    return failure ? ErrorOrVoid(true, ErrorCodes::UNKNOWN) : ErrorOrVoid();
+}
+
+ErrorOrVoid File::insertString(tiny_utf8::string string){
+    bool failure = false;
+
+    try{
+        uint8_t* buffer = new uint8_t[this->size.value];
+        tiny_utf8::string readData;
+
+        this->fileStream.read(reinterpret_cast<char*>(buffer), this->size.value);
+        
+        readData = tiny_utf8::string((char *) buffer);
+        readData.insert(readData.begin()+this->cursorPosition, string);
+
+        this->fileStream.seekg(0);
+
+        //TODO: fix hack. tinyutf8 appends "_utf-8" when readData is assigned: tiny_utf8::string((char *) buffer);
+        this->writeString(readData.substr(0, readData.find("_utf-8")));
+        this->cursorPosition += string.size();
         
     }catch(std::exception& e){
         failure = true;

src/test/file.cpp

@@ -138,4 +138,30 @@ int main(){
 
     ASSERT(modifyByteString == "Hallo,, Ich bin Shwoomple.");
     std::cout << "Passed modify byte test" << std::endl;
+
+    modifyFile->open();
+    modifyFile->cursorPosition = 6;
+    modifyFile->insert(std::vector<uint8_t>({' ', 'H', 'i'}));
+    modifyFile->close();
+
+    readFile->open();
+    readFile->cursorPosition = 0;
+    tiny_utf8::string modifyBytesString = readFile->readString(readFile->size.value).value;
+    readFile->close();
+
+    ASSERT(modifyBytesString == "Hallo, Hi, Ich bin Shwoomple.");
+    std::cout << "Passed modify test" << std::endl;
+
+    modifyFile->open();
+    modifyFile->cursorPosition = 9;
+    modifyFile->insertString(" THE CAKE IS A LIE");
+    modifyFile->close();
+
+    readFile->open();
+    readFile->cursorPosition = 0;
+    tiny_utf8::string modifyString = readFile->readString(readFile->size.value).value;
+    readFile->close();
+
+    ASSERT(modifyString == "Hallo, Hi THE CAKE IS A LIE, Ich bin Shwoomple.");
+    std::cout << "Passed modify string test" << std::endl;
 }