Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.lz4 / src / net / jpountz / util / SafeUtils.java

diff --git a/bundles/org.simantics.lz4/src/net/jpountz/util/SafeUtils.java b/bundles/org.simantics.lz4/src/net/jpountz/util/SafeUtils.java
new file mode 100644 (file)
index 0000000..ceaf917
--- /dev/null
+++ b/bundles/org.simantics.lz4/src/net/jpountz/util/SafeUtils.java
@@ -0,0 +1,95 @@
+package net.jpountz.util;
+
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.nio.ByteOrder;
+
+public enum SafeUtils {
+  ;
+
+  public static void checkRange(byte[] buf, int off) {
+    if (off < 0 || off >= buf.length) {
+      throw new ArrayIndexOutOfBoundsException(off);
+    }
+  }
+
+  public static void checkRange(byte[] buf, int off, int len) {
+    checkLength(len);
+    if (len > 0) {
+      checkRange(buf, off);
+      checkRange(buf, off + len - 1);
+    }
+  }
+
+  public static void checkLength(int len) {
+    if (len < 0) {
+      throw new IllegalArgumentException("lengths must be >= 0");
+    }
+  }
+
+  public static byte readByte(byte[] buf, int i) {
+    return buf[i];
+  }
+
+  public static int readIntBE(byte[] buf, int i) {
+    return ((buf[i] & 0xFF) << 24) | ((buf[i+1] & 0xFF) << 16) | ((buf[i+2] & 0xFF) << 8) | (buf[i+3] & 0xFF);
+  }
+
+  public static int readIntLE(byte[] buf, int i) {
+    return (buf[i] & 0xFF) | ((buf[i+1] & 0xFF) << 8) | ((buf[i+2] & 0xFF) << 16) | ((buf[i+3] & 0xFF) << 24);
+  }
+
+  public static int readInt(byte[] buf, int i) {
+    if (Utils.NATIVE_BYTE_ORDER == ByteOrder.BIG_ENDIAN) {
+      return readIntBE(buf, i);
+    } else {
+      return readIntLE(buf, i);
+    }
+  }
+
+  public static long readLongLE(byte[] buf, int i) {
+    return (buf[i] & 0xFFL) | ((buf[i+1] & 0xFFL) << 8) | ((buf[i+2] & 0xFFL) << 16) | ((buf[i+3] & 0xFFL) << 24)
+         | ((buf[i+4] & 0xFFL) << 32) | ((buf[i+5] & 0xFFL) << 40) | ((buf[i+6] & 0xFFL) << 48) | ((buf[i+7] & 0xFFL) << 56);
+  }
+
+  public static void writeShortLE(byte[] buf, int off, int v) {
+    buf[off++] = (byte) v;
+    buf[off++] = (byte) (v >>> 8);
+  }
+
+  public static void writeInt(int[] buf, int off, int v) {
+    buf[off] = v;
+  }
+
+  public static int readInt(int[] buf, int off) {
+    return buf[off];
+  }
+
+  public static void writeByte(byte[] dest, int off, int i) {
+    dest[off] = (byte) i;
+  }
+
+  public static void writeShort(short[] buf, int off, int v) {
+    buf[off] = (short) v;
+  }
+
+  public static int readShortLE(byte[] buf, int i) {
+    return (buf[i] & 0xFF) | ((buf[i+1] & 0xFF) << 8);
+  }
+
+  public static int readShort(short[] buf, int off) {
+    return buf[off] & 0xFFFF;
+  }
+}