Possibility to parse a DBC represented as string

pom.xml

@@ -32,6 +32,11 @@
             <artifactId>jaxb-impl</artifactId>
             <version>2.4.0-b180830.0438</version>
         </dependency>
+        <dependency>
+		    <groupId>commons-io</groupId>
+		    <artifactId>commons-io</artifactId>
+		    <version>2.18.0</version>
+		</dependency>
     </dependencies>
 
 

src/main/java/com/github/canbabel/canio/dbc/DbcReader.java

@@ -135,6 +135,14 @@ private static Signal findSignal(List<Message> messages, long id, boolean e, Str
         }
         return null;
     }
+
+    public BufferedReader getFileReader(File file) throws UnsupportedEncodingException, FileNotFoundException {
+    	return new BufferedReader(new InputStreamReader(new FileInputStream(file), "ISO-8859-1"));
+    }
+
+    public boolean parseString(String input) {
+    	return parseFile(null, System.out, new BufferedReader(new StringReader(input)));
+    }
 
     /**
      * Read in given CAN database file (*.dbc)
@@ -143,7 +151,7 @@ private static Signal findSignal(List<Message> messages, long id, boolean e, Str
      * @param logStream OutputStream to write out stack traces
      * @return true, if file has been successfully read.
      */
-    public boolean parseFile(File file, OutputStream logStream) {
+    public boolean parseFile(File file, OutputStream logStream, BufferedReader bufferedReader) {
         try {
             logWriter = new PrintWriter(new BufferedWriter(new OutputStreamWriter(logStream, "ISO-8859-1")), true);
         } catch (UnsupportedEncodingException ex) {
@@ -153,7 +161,9 @@ public boolean parseFile(File file, OutputStream logStream) {
         network = (NetworkDefinition) (factory.createNetworkDefinition());
         document = (Document) (factory.createDocument());
         document.setContent(DOC_CONTENT);
-        document.setName(file.getName());
+        if (file != null) {
+        	document.setName(file.getName());
+        }
         Date now = Calendar.getInstance().getTime();
         document.setDate(now.toString());
         network.setDocument(document);
@@ -162,15 +172,19 @@ public boolean parseFile(File file, OutputStream logStream) {
 
         bus.setName("Private");
 
-        if (!(file.canRead() && file.exists())) {
+        if (!(file != null && file.canRead() && file.exists()) && bufferedReader == null) {
             throw new RuntimeException("could not open file");
         }
 
         StringBuilder contents = new StringBuilder();
         BufferedReader reader = null;
 
         try {
-            reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), "ISO-8859-1"));
+        	if (bufferedReader != null) {
+        		reader = bufferedReader;
+        	} else {
+        		reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), "ISO-8859-1"));
+        	}
             String text;
             boolean isFirstLine = true;
 
@@ -1211,4 +1225,9 @@ public static int bigEndianLeastSignificantBitOffset(int msb, int length) {
 
         return lsb;
     }
+
+    public Bus getBus() {
+		return bus;
+	}
+
 }

src/main/java/com/github/canbabel/canio/ui/MainFrame.java

@@ -409,7 +409,7 @@ private static void startCmdLine(String dbc, String kcd) {
 
         if (dbcfile.canRead()) {
             DbcReader reader = new DbcReader();
-            if (reader.parseFile(dbcfile, System.out)) {
+            if (reader.parseFile(dbcfile, System.out, null)) {
                 reader.writeKcdFile(kcdfile, true, false);
 
                 /* Validate the result */
@@ -520,7 +520,7 @@ public void run() {
                 try {
                     DbcReader reader = new DbcReader();
                     reader.omitUnconsumedSignals(uselessCheckbox.isSelected());
-                    if (reader.parseFile(f, logOutput)) {
+                    if (reader.parseFile(f, logOutput, null)) {
                         reader.writeKcdFile(newFile, prettyprintCheckbox.isSelected(), gzippedCheckbox.isSelected());
 
                         /* Validate the result */

src/test/java/com/github/canbabel/canio/dbc/CANFDTest.java

@@ -23,7 +23,7 @@ public void setUp() {
         dr = new DbcReader();
         URL url = Thread.currentThread().getContextClassLoader().getResource("canfdtest.dbc");
         File testFile = new File(url.getPath());
-        dr.parseFile(testFile, System.out);
+        dr.parseFile(testFile, System.out, null);
     }
 
     /**

src/test/java/com/github/canbabel/canio/dbc/DbcReadFileTest.java

@@ -74,7 +74,7 @@ public void readAndValidateTest(){
             String kcd = filename.replaceAll("dbc", "kcd");
             File fkcd = new File(kcd);
 
-            if (reader.parseFile(fdbc, System.out)) {
+            if (reader.parseFile(fdbc, System.out, null)) {
                 reader.writeKcdFile(fkcd, true, false);
 
                 StreamSource source = new StreamSource(fkcd);

src/test/java/com/github/canbabel/canio/dbc/DbcReadStringTest.java

@@ -0,0 +1,63 @@
+/**
+ *  CANBabel - Translator for Controller Area Network description formats
+ *  Copyright (C) 2011-2025 julietkilo and Jan-Niklas Meier
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ **/
+package com.github.canbabel.canio.dbc;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+
+import javax.xml.transform.stream.StreamSource;
+
+import org.apache.commons.io.FileUtils;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.github.canbabel.canio.ui.SchemaValidator;
+
+public class DbcReadStringTest {
+
+    private File testFile = null;
+
+    @Before
+    public void setUp() {
+        URL url = Thread.currentThread().getContextClassLoader().getResource("read_in_test.dbc");
+        testFile = new File(url.getPath());
+    }
+
+    @Test
+    public void readAndValidateTest() throws IOException{
+        DbcReader reader = new DbcReader();
+        File readInTestKcdFile = new File("read_in_test.kcd");
+
+        String testFileContent = FileUtils.readFileToString(testFile, StandardCharsets.UTF_8);
+
+        if (reader.parseString(testFileContent)) {
+            assertNotNull(reader.getBus());
+
+            StreamSource source = new StreamSource(readInTestKcdFile);
+            SchemaValidator validator = new SchemaValidator(System.out);
+
+            assertTrue(validator.validate(source));
+        }
+    }
+
+}