1 files changed, 100 insertions, 0 deletions

diff --git a/dx/src/com/android/jack/dx/io/EncodedValueCodec.java b/dx/src/com/android/jack/dx/io/EncodedValueCodec.java
new file mode 100644
index 00000000..01b0cc97
--- /dev/null
+++ b/dx/src/com/android/jack/dx/io/EncodedValueCodec.java
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * 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.
+ */
+
+package com.android.jack.dx.io;
+
+import com.android.jack.dx.util.ByteInput;
+
+import javax.annotation.Nonnegative;
+import javax.annotation.Nonnull;
+
+
+public class EncodedValueCodec {
+
+  private EncodedValueCodec() {}
+
+  /**
+   * Read a signed integer.
+   *
+   * @param zwidth byte count minus one
+   */
+  public static int readSignedInt(@Nonnull ByteInput in, @Nonnegative int zwidth) {
+    int result = 0;
+    for (int i = zwidth; i >= 0; i--) {
+      result = (result >>> 8) | ((in.readByte() & 0xff) << 24);
+    }
+    result >>= (3 - zwidth) * 8;
+    return result;
+  }
+
+  /**
+   * Read an unsigned integer.
+   *
+   * @param zwidth byte count minus one
+   * @param fillOnRight true to zero fill on the right; false on the left
+   */
+  public static int readUnsignedInt(@Nonnull ByteInput in, @Nonnegative int zwidth,
+      boolean fillOnRight) {
+    int result = 0;
+    if (!fillOnRight) {
+      for (int i = zwidth; i >= 0; i--) {
+        result = (result >>> 8) | ((in.readByte() & 0xff) << 24);
+      }
+      result >>>= (3 - zwidth) * 8;
+    } else {
+      for (int i = zwidth; i >= 0; i--) {
+        result = (result >>> 8) | ((in.readByte() & 0xff) << 24);
+      }
+    }
+    return result;
+  }
+
+  /**
+   * Read a signed long.
+   *
+   * @param zwidth byte count minus one
+   */
+  public static long readSignedLong(@Nonnull ByteInput in, @Nonnegative int zwidth) {
+    long result = 0;
+    for (int i = zwidth; i >= 0; i--) {
+      result = (result >>> 8) | ((in.readByte() & 0xffL) << 56);
+    }
+    result >>= (7 - zwidth) * 8;
+    return result;
+  }
+
+  /**
+   * Read an unsigned long.
+   *
+   * @param zwidth byte count minus one
+   * @param fillOnRight true to zero fill on the right; false on the left
+   */
+  public static long readUnsignedLong(@Nonnull ByteInput in, @Nonnegative int zwidth,
+      boolean fillOnRight) {
+    long result = 0;
+    if (!fillOnRight) {
+      for (int i = zwidth; i >= 0; i--) {
+        result = (result >>> 8) | ((in.readByte() & 0xffL) << 56);
+      }
+      result >>>= (7 - zwidth) * 8;
+    } else {
+      for (int i = zwidth; i >= 0; i--) {
+        result = (result >>> 8) | ((in.readByte() & 0xffL) << 56);
+      }
+    }
+    return result;
+  }
+}
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