fix exception in Bits

Author: 15045120

build.gradle

@@ -26,7 +26,7 @@ tasks.withType(JavaCompile) { options.encoding = "UTF-8" }
 
 group = 'com.github.myibu'
 archivesBaseName = "algorithm-java"
-version = "1.0.0f"
+version = "1.0.0g"
 
 repositories {
     mavenCentral()

readme.md

@@ -57,7 +57,7 @@ Reference to: [HoffmanAndGolombCoding.pdf](./docs/HoffmanAndGolombCoding.pdf)
 <dependency>
   <groupId>com.github.myibu</groupId>
   <artifactId>algorithm-java</artifactId>
-  <version>1.0.0f</version>
+  <version>1.0.0g</version>
 </dependency>
 ```
 

src/main/java/com/github/myibu/algorithm/data/Bits.java

@@ -273,6 +273,7 @@ public static Bits ofByte(byte val, int len) {
     }
 
     public static Bits ofByte(byte[] val) {
+        if (val == null || val.length == 0) return new Bits();
         int i = 0;
         Bits first = ofByte(val[i++]);
         for (; i < val.length; i++) {
@@ -300,6 +301,7 @@ public static Bits ofShort(short val, int len) {
     }
 
     public static Bits ofShort(short[] val) {
+        if (val == null || val.length == 0) return new Bits();
         int i = 0;
         Bits first = ofShort(val[i++]);
         for (; i < val.length; i++) {
@@ -327,6 +329,7 @@ public static Bits ofInt(int val, int len) {
     }
 
     public static Bits ofInt(int[] val) {
+        if (val == null || val.length == 0) return new Bits();
         int i = 0;
         Bits first = ofInt(val[i++]);
         for (; i < val.length; i++) {
@@ -406,6 +409,7 @@ public static Bits ofLong(long val, int len) {
     }
 
     public static Bits ofLong(long[] val) {
+        if (val == null || val.length == 0) return new Bits();
         int i = 0;
         Bits first = ofLong(val[i++]);
         for (; i < val.length; i++) {