diff --git a/app/src/main/java/protect/card_locker/ZipUtils.java b/app/src/main/java/protect/card_locker/ZipUtils.java
index 9935323b5..c0c30bd1d 100644
--- a/app/src/main/java/protect/card_locker/ZipUtils.java
+++ b/app/src/main/java/protect/card_locker/ZipUtils.java
@@ -15,7 +15,15 @@ import java.io.Reader;
 import java.nio.charset.StandardCharsets;
 
 public class ZipUtils {
-    static public String read(ZipInputStream zipInputStream) throws IOException {
+    public static Bitmap readImage(ZipInputStream zipInputStream) {
+        return BitmapFactory.decodeStream(zipInputStream);
+    }
+
+    public static JSONObject readJSON(ZipInputStream zipInputStream) throws IOException, JSONException {
+        return new JSONObject(read(zipInputStream));
+    }
+
+    private static String read(ZipInputStream zipInputStream) throws IOException {
         StringBuilder stringBuilder = new StringBuilder();
         Reader reader = new BufferedReader(new InputStreamReader(zipInputStream, StandardCharsets.UTF_8));
         int c;
@@ -24,12 +32,4 @@ public class ZipUtils {
         }
         return stringBuilder.toString();
     }
-
-    static public Bitmap readImage(ZipInputStream zipInputStream) {
-        return BitmapFactory.decodeStream(zipInputStream);
-    }
-
-    static public JSONObject readJSON(ZipInputStream zipInputStream) throws IOException, JSONException {
-        return new JSONObject(read(zipInputStream));
-    }
 }
diff --git a/app/src/main/java/protect/card_locker/importexport/CatimaImporter.java b/app/src/main/java/protect/card_locker/importexport/CatimaImporter.java
index d83c25655..40c290b22 100644
--- a/app/src/main/java/protect/card_locker/importexport/CatimaImporter.java
+++ b/app/src/main/java/protect/card_locker/importexport/CatimaImporter.java
@@ -13,7 +13,6 @@ import org.apache.commons.csv.CSVRecord;
 
 import java.io.BufferedInputStream;
 import java.io.BufferedReader;
-import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -55,7 +54,7 @@ public class CatimaImporter implements Importer {
 
             String fileName = Uri.parse(localFileHeader.getFileName()).getLastPathSegment();
             if (fileName.equals("catima.csv")) {
-                importCSV(context, database, new ByteArrayInputStream(ZipUtils.read(zipInputStream).getBytes(StandardCharsets.UTF_8)));
+                importCSV(context, database, zipInputStream);
             } else if (fileName.endsWith(".png")) {
                 Utils.saveCardImage(context, ZipUtils.readImage(zipInputStream), fileName);
             } else {
@@ -68,23 +67,14 @@ public class CatimaImporter implements Importer {
             bufferedInputStream.reset();
             importCSV(context, database, bufferedInputStream);
         }
+
+        input.close();
     }
 
     public void importCSV(Context context, SQLiteDatabase database, InputStream input) throws IOException, FormatException, InterruptedException {
         BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(input, StandardCharsets.UTF_8));
 
-        bufferedReader.mark(100);
-
-        Integer version = 1;
-
-        try {
-            version = Integer.parseInt(bufferedReader.readLine());
-        } catch (NumberFormatException _e) {
-            // Assume version 1
-        }
-
-        bufferedReader.reset();
-
+        int version = parseVersion(bufferedReader);
         switch (version) {
             case 1:
                 parseV1(context, database, bufferedReader);
@@ -95,8 +85,6 @@ public class CatimaImporter implements Importer {
             default:
                 throw new FormatException(String.format("No code to parse version %s", version));
         }
-
-        bufferedReader.close();
     }
 
     public void parseV1(Context context, SQLiteDatabase database, BufferedReader input) throws IOException, FormatException, InterruptedException {
@@ -118,8 +106,8 @@ public class CatimaImporter implements Importer {
     }
 
     public void parseV2(Context context, SQLiteDatabase database, BufferedReader input) throws IOException, FormatException, InterruptedException {
-        Integer part = 0;
-        String stringPart = "";
+        int part = 0;
+        StringBuilder stringPart = new StringBuilder();
 
         try {
             while (true) {
@@ -135,7 +123,7 @@ public class CatimaImporter implements Importer {
                             break;
                         case 1:
                             try {
-                                parseV2Groups(database, stringPart);
+                                parseV2Groups(database, stringPart.toString());
                                 sectionParsed = true;
                             } catch (FormatException e) {
                                 // We may have a multiline field, try again
@@ -143,7 +131,7 @@ public class CatimaImporter implements Importer {
                             break;
                         case 2:
                             try {
-                                parseV2Cards(context, database, stringPart);
+                                parseV2Cards(context, database, stringPart.toString());
                                 sectionParsed = true;
                             } catch (FormatException e) {
                                 // We may have a multiline field, try again
@@ -151,7 +139,7 @@ public class CatimaImporter implements Importer {
                             break;
                         case 3:
                             try {
-                                parseV2CardGroups(database, stringPart);
+                                parseV2CardGroups(database, stringPart.toString());
                                 sectionParsed = true;
                             } catch (FormatException e) {
                                 // We may have a multiline field, try again
@@ -167,12 +155,12 @@ public class CatimaImporter implements Importer {
 
                     if (sectionParsed) {
                         part += 1;
-                        stringPart = "";
+                        stringPart = new StringBuilder();
                     } else {
-                        stringPart += tmp + "\n";
+                        stringPart.append(tmp).append('\n');
                     }
                 } else {
-                    stringPart += tmp + "\n";
+                    stringPart.append(tmp).append('\n');
                 }
             }
         } catch (FormatException e) {
@@ -255,6 +243,35 @@ public class CatimaImporter implements Importer {
         }
     }
 
+    /**
+     * Parse the version number of the import file
+     *
+     * @param reader the reader containing the import file
+     * @return the parsed version number, defaulting to 1 if none is found
+     * @throws IOException there was a problem reading the file
+     */
+    private int parseVersion(BufferedReader reader) throws IOException {
+        reader.mark(10); // slightly over the search limit just to be sure
+        StringBuilder sb = new StringBuilder();
+        int searchLimit = 5; // gives you version numbers up to 99999
+        int codePoint;
+        // search until the next whitespace, indicating the end of the version
+        while (!Character.isWhitespace(codePoint = reader.read())) {
+            // we found something that isn't a digit, or we ran out of chars
+            if (!Character.isDigit(codePoint) || searchLimit <= 0) {
+                reader.reset();
+                return 1; // default value
+            }
+            sb.append((char) codePoint);
+            searchLimit--;
+        }
+        reader.reset();
+        if (sb.length() == 0) {
+            return 1;
+        }
+        return Integer.parseInt(sb.toString());
+    }
+
     /**
      * Import a single loyalty card into the database using the given
      * session.
@@ -338,7 +355,7 @@ public class CatimaImporter implements Importer {
             // We catch this exception so we can still import old backups
         }
 
-        DBHelper.insertLoyaltyCard(database, id, store, note, expiry, balance, balanceType, cardId, barcodeId, barcodeType, headerColor, starStatus, lastUsed,archiveStatus);
+        DBHelper.insertLoyaltyCard(database, id, store, note, expiry, balance, balanceType, cardId, barcodeId, barcodeType, headerColor, starStatus, lastUsed, archiveStatus);
     }
 
     /**