Updated on 2026-08-14

app/src/main/java/com/tangem/util/ByteUtil.java

@@ -0,0 +1,39 @@
+package com.tangem.util;
+
+public class ByteUtil {
+
+    public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
+    public static byte[] and(byte[] b1, byte[] b2) {
+        if (b1.length != b2.length) throw new RuntimeException("Array sizes differ");
+        byte[] ret = new byte[b1.length];
+        for (int i = 0; i < ret.length; i++) {
+            ret[i] = (byte) (b1[i] & b2[i]);
+        }
+        return ret;
+    }
+
+    public static byte[] or(byte[] b1, byte[] b2) {
+        if (b1.length != b2.length) throw new RuntimeException("Array sizes differ");
+        byte[] ret = new byte[b1.length];
+        for (int i = 0; i < ret.length; i++) {
+            ret[i] = (byte) (b1[i] | b2[i]);
+        }
+        return ret;
+    }
+
+    public static boolean isNullOrZeroArray(byte[] array){
+        return (array == null) || (array.length == 0);
+    }
+
+    public static boolean isSingleZero(byte[] array){
+        return (array.length == 1 && array[0] == 0);
+    }
+
+    public static int length(byte[]... bytes) {
+        int result = 0;
+        for (byte[] array : bytes) {
+            result += (array == null) ? 0 : array.length;
+        }
+        return result;
+    }
+}

app/src/main/java/com/tangem/util/FormatUtil.java

@@ -0,0 +1,44 @@
+package com.tangem.util;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.text.DecimalFormat;
+import java.text.DecimalFormatSymbols;
+
+/**
+ * Created by Ilia on 15.02.2018.
+ */
+
+public class FormatUtil {
+    public static long parseValue(String valueStr) throws NumberFormatException {
+        return new BigDecimal(valueStr).multiply(BigDecimal.valueOf(1_0000_0000)).setScale(0, BigDecimal.ROUND_HALF_DOWN).longValueExact();
+    }
+
+    public static String DoubleToString(double amount) {
+        DecimalFormat myFormatter = GetDecimalFormat();
+        String output = myFormatter.format(amount);
+        return output;
+    }
+
+    public static DecimalFormat GetDecimalFormat() {
+        DecimalFormatSymbols symbols = new DecimalFormatSymbols();
+        symbols.setDecimalSeparator('.');
+
+        String pattern = "#0.######";
+        DecimalFormat myFormatter = new DecimalFormat(pattern, symbols);
+
+        myFormatter.setParseBigDecimal(true);
+
+        return myFormatter;
+    }
+
+    public static long ConvertStringToLong(String caption) throws Exception {
+        BigDecimal d = new BigDecimal(caption);
+        d = d.multiply(new BigDecimal(100000));
+        d = d.setScale(5);
+        BigInteger b = d.toBigInteger();
+        long l = b.longValue();
+        return l;
+    }
+
+}