Merge "Make a copy of libcore.util.ArraysUtils in framework" am: f35963cb77

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1531681

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ia74bb76418cbed901535af0fafe1e2e03423806e

core/java/android/content/pm/LimitedLengthInputStream.java

@@ -1,6 +1,6 @@
 package android.content.pm;
 
-import libcore.util.ArrayUtils;
+import com.android.internal.util.ArrayUtils;
 
 import java.io.FilterInputStream;
 import java.io.IOException;

core/java/android/os/FileBridge.java

@@ -22,11 +22,12 @@ import android.system.ErrnoException;
 import android.system.Os;
 import android.util.Log;
 
+import com.android.internal.util.ArrayUtils;
+
 import libcore.io.IoBridge;
 import libcore.io.IoUtils;
 import libcore.io.Memory;
 import libcore.io.Streams;
-import libcore.util.ArrayUtils;
 
 import java.io.FileDescriptor;
 import java.io.IOException;

core/java/android/os/Parcel.java

@@ -33,11 +33,12 @@ import android.util.SparseArray;
 import android.util.SparseBooleanArray;
 import android.util.SparseIntArray;
 
+import com.android.internal.util.ArrayUtils;
+
 import dalvik.annotation.optimization.CriticalNative;
 import dalvik.annotation.optimization.FastNative;
 import dalvik.system.VMRuntime;
 
-import libcore.util.ArrayUtils;
 import libcore.util.SneakyThrow;
 
 import java.io.ByteArrayInputStream;

core/java/com/android/internal/util/ArrayUtils.java

@@ -733,6 +733,25 @@ public class ArrayUtils {
         }
     }
 
+    /**
+     * Throws {@link ArrayIndexOutOfBoundsException} if the range is out of bounds.
+     * @param len length of the array. Must be non-negative
+     * @param offset start index of the range. Must be non-negative
+     * @param count length of the range. Must be non-negative
+     * @throws ArrayIndexOutOfBoundsException if the range from {@code offset} with length
+     * {@code count} is out of bounds of the array
+     */
+    public static void throwsIfOutOfBounds(int len, int offset, int count) {
+        if (len < 0) {
+            throw new ArrayIndexOutOfBoundsException("Negative length: " + len);
+        }
+
+        if ((offset | count) < 0 || offset > len - count) {
+            throw new ArrayIndexOutOfBoundsException(
+                    "length=" + len + "; regionStart=" + offset + "; regionLength=" + count);
+        }
+    }
+
     /**
      * Returns an array with values from {@code val} minus {@code null} values
      *

core/tests/coretests/src/com/android/internal/util/ArrayUtilsTest.java

@@ -118,4 +118,89 @@ public class ArrayUtilsTest extends TestCase {
         assertEquals(3, ArrayUtils.unstableRemoveIf(collection, isNull));
         assertEquals(0, collection.size());
     }
+
+    @SmallTest
+    public void testThrowsIfOutOfBounds_passesWhenRangeInsideArray() {
+        ArrayUtils.throwsIfOutOfBounds(10, 2, 6);
+    }
+
+    @SmallTest
+    public void testThrowsIfOutOfBounds_passesWhenRangeIsWholeArray() {
+        ArrayUtils.throwsIfOutOfBounds(10, 0, 10);
+    }
+
+    @SmallTest
+    public void testThrowsIfOutOfBounds_passesWhenEmptyRangeAtStart() {
+        ArrayUtils.throwsIfOutOfBounds(10, 0, 0);
+    }
+
+    @SmallTest
+    public void testThrowsIfOutOfBounds_passesWhenEmptyRangeAtEnd() {
+        ArrayUtils.throwsIfOutOfBounds(10, 10, 0);
+    }
+
+    @SmallTest
+    public void testThrowsIfOutOfBounds_passesWhenEmptyArray() {
+        ArrayUtils.throwsIfOutOfBounds(0, 0, 0);
+    }
+
+    @SmallTest
+    public void testThrowsIfOutOfBounds_failsWhenRangeStartNegative() {
+        try {
+            ArrayUtils.throwsIfOutOfBounds(10, -1, 5);
+            fail();
+        } catch (ArrayIndexOutOfBoundsException expected) {
+            // expected
+        }
+    }
+
+    @SmallTest
+    public void testThrowsIfOutOfBounds_failsWhenCountNegative() {
+        try {
+            ArrayUtils.throwsIfOutOfBounds(10, 5, -1);
+            fail();
+        } catch (ArrayIndexOutOfBoundsException expected) {
+            // expected
+        }
+    }
+
+    @SmallTest
+    public void testThrowsIfOutOfBounds_failsWhenRangeStartTooHigh() {
+        try {
+            ArrayUtils.throwsIfOutOfBounds(10, 11, 0);
+            fail();
+        } catch (ArrayIndexOutOfBoundsException expected) {
+            // expected
+        }
+    }
+
+    @SmallTest
+    public void testThrowsIfOutOfBounds_failsWhenRangeEndTooHigh() {
+        try {
+            ArrayUtils.throwsIfOutOfBounds(10, 5, 6);
+            fail();
+        } catch (ArrayIndexOutOfBoundsException expected) {
+            // expected
+        }
+    }
+
+    @SmallTest
+    public void testThrowsIfOutOfBounds_failsWhenLengthNegative() {
+        try {
+            ArrayUtils.throwsIfOutOfBounds(-1, 0, 0);
+            fail();
+        } catch (ArrayIndexOutOfBoundsException expected) {
+            // expected
+        }
+    }
+
+    @SmallTest
+    public void testThrowsIfOutOfBounds_failsWhenOverflowRangeEndTooHigh() {
+        try {
+            ArrayUtils.throwsIfOutOfBounds(Integer.MAX_VALUE, Integer.MAX_VALUE, Integer.MAX_VALUE);
+            fail();
+        } catch (ArrayIndexOutOfBoundsException expected) {
+            // expected
+        }
+    }
 }

drm/java/android/drm/DrmOutputStream.java

@@ -25,9 +25,10 @@ import android.system.ErrnoException;
 import android.system.Os;
 import android.util.Log;
 
+import com.android.internal.util.ArrayUtils;
+
 import libcore.io.IoBridge;
 import libcore.io.Streams;
-import libcore.util.ArrayUtils;
 
 import java.io.FileDescriptor;
 import java.io.FilterOutputStream;