Add decimal conversion

Author: Real96

Mifare Classic Tool/app/src/main/java/de/syss/MifareClassicTool/Activities/DataConversionTool.java

@@ -40,6 +40,7 @@ public class DataConversionTool extends BasicActivity {
     EditText mAscii;
     EditText mHex;
     EditText mBin;
+    EditText mDec;
 
     /**
      * Initialize the some member variables.
@@ -51,6 +52,7 @@ protected void onCreate(Bundle savedInstanceState) {
         mAscii = findViewById(R.id.editTextDataConversionToolAscii);
         mHex = findViewById(R.id.editTextDataConversionToolHex);
         mBin = findViewById(R.id.editTextDataConversionToolBin);
+        mDec = findViewById(R.id.editTextDataConversionToolDec);
     }
 
     /**
@@ -75,6 +77,11 @@ public void onConvert(View view) {
             if (isBin(bin, this)) {
                 convertData(Common.bin2Hex(bin));
             }
+        } else if (id == R.id.imageButtonDataConversionToolDec) {
+            String dec = mDec.getText().toString();
+            if (Common.isDec(dec, this)) {
+                convertData(Common.dec2Hex(dec));
+            }
         }
     }
 
@@ -100,6 +107,8 @@ private void convertData(String hex) {
         }
         // Bin.
         mBin.setText(Common.hex2Bin(hex));
+        // Dec.
+        mDec.setText(Common.hex2Dec(hex));
     }
 
     /**

Mifare Classic Tool/app/src/main/java/de/syss/MifareClassicTool/Common.java

@@ -1904,6 +1904,68 @@ public static String bin2Hex(String bin) {
         return hex;
     }
 
+    /**
+     * Convert a decimal string to a hex string.
+     * @param dec Decimal string to convert.
+     * @return Converted hex string.
+     */
+    public static String dec2Hex(String dec) {
+        String[] parts = dec.split(" ");
+        StringBuilder hex = new StringBuilder();
+        for (String part : parts) {
+            int value = Integer.parseInt(part);
+            hex.append(String.format("%02X", value));
+        }
+        return hex.toString();
+    }
+
+    /**
+     * Convert a hex string to a decimal string.
+     * @param hex Hex string to convert.
+     * @return Converted decimal string.
+     */
+    public static String hex2Dec(String hex) {
+        StringBuilder dec = new StringBuilder();
+        for (int i = 0; i < hex.length(); i += 2) {
+            int value = Integer.parseInt(hex.substring(i, i + 2), 16);
+            if (i > 0) {
+                dec.append(" ");
+            }
+            dec.append(value);
+        }
+        return dec.toString();
+    }
+
+    /**
+     * Check if a string represents decimal bytes (0-255, space-separated).
+     * @param dec Decimal string to check.
+     * @param context The Context in which an error Toast will be shown.
+     * @return True if string is valid decimal, false otherwise.
+     */
+    public static boolean isDec(String dec, Context context) {
+        if (dec == null || dec.isEmpty()) {
+            Toast.makeText(context, R.string.info_not_dec_data,
+                    Toast.LENGTH_LONG).show();
+            return false;
+        }
+        String[] parts = dec.split(" ");
+        for (String part : parts) {
+            try {
+                int value = Integer.parseInt(part);
+                if (value < 0 || value > 255) {
+                    Toast.makeText(context, R.string.info_not_dec_data,
+                            Toast.LENGTH_LONG).show();
+                    return false;
+                }
+            } catch (NumberFormatException e) {
+                Toast.makeText(context, R.string.info_not_dec_data,
+                        Toast.LENGTH_LONG).show();
+                return false;
+            }
+        }
+        return true;
+    }
+
     /**
      * Create a colored string.
      * @param data The text to be colored.

Mifare Classic Tool/app/src/main/res/layout/activity_data_conversion_tool.xml

@@ -140,6 +140,43 @@
 
         </LinearLayout>
 
+        <!-- Dec -->
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:orientation="horizontal">
+
+            <TextView
+                android:id="@+id/textViewDataConversionToolDec"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:minEms="4"
+                android:textAppearance="?android:attr/textAppearanceMedium"
+                android:gravity="right"
+                android:paddingRight="5dp"
+                android:text="@string/text_dec"
+                android:labelFor="@+id/editTextDataConversionToolDec" />
+
+            <EditText
+                android:id="@+id/editTextDataConversionToolDec"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:inputType="numberSigned"
+                android:typeface="monospace"
+                android:imeOptions="actionDone"
+                android:importantForAutofill="no" />
+
+            <ImageButton
+                android:id="@+id/imageButtonDataConversionToolDec"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:src="@android:drawable/stat_notify_sync"
+                android:contentDescription="@string/text_convert"
+                android:onClick="onConvert" />
+
+        </LinearLayout>
+
         <TextView
             android:id="@+id/textViewDataConversionToolMoreOptions"
             android:layout_width="wrap_content"

Mifare Classic Tool/app/src/main/res/values/strings.xml

@@ -200,6 +200,8 @@
     <string name="text_ascii">ASCII</string>
     <string name="text_hex">Hex</string>
     <string name="text_bin">Bin</string>
+    <string name="text_dec">Dec</string>
+    <string name="info_not_dec_data">Invalid decimal format</string>
     <string name="text_dec_be">Dec (BE)</string>
     <string name="text_dec_le">Dec (LE)</string>
     <string name="text_invalid_ac">Access Conditions are invalid</string>