1 files changed, 59 insertions, 0 deletions
diff --git a/support/src/test/java/libcore/tlswire/util/IoUtils.java b/support/src/test/java/libcore/tlswire/util/IoUtils.java
new file mode 100644
index 0000000..1e2d8f2
--- /dev/null
+++ b/support/src/test/java/libcore/tlswire/util/IoUtils.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2014 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 libcore.tlswire.util;
+
+import java.io.DataInput;
+import java.io.IOException;
+
+public class IoUtils {
+
+    public static int readUnsignedInt24(DataInput in) throws IOException {
+        return (in.readUnsignedByte() << 16) | in.readUnsignedShort();
+    }
+
+    public static byte[] readTlsVariableLengthByteVector(DataInput in, int maxSizeBytes)
+            throws IOException {
+        int sizeBytes = readTlsVariableLengthVectorSizeBytes(in, maxSizeBytes);
+        byte[] result = new byte[sizeBytes];
+        in.readFully(result);
+        return result;
+    }
+
+    public static int[] readTlsVariableLengthUnsignedShortVector(DataInput in, int maxSizeBytes)
+            throws IOException {
+        int sizeBytes = readTlsVariableLengthVectorSizeBytes(in, maxSizeBytes);
+        int elementCount = sizeBytes / 2;
+        int[] result = new int[elementCount];
+        for (int i = 0; i < elementCount; i++) {
+            result[i] = in.readUnsignedShort();
+        }
+        return result;
+    }
+
+    private static int readTlsVariableLengthVectorSizeBytes(DataInput in, int maxSizeBytes)
+            throws IOException {
+        if (maxSizeBytes < 0x100) {
+            return in.readUnsignedByte();
+        } else if (maxSizeBytes < 0x10000) {
+            return in.readUnsignedShort();
+        } else if (maxSizeBytes < 0x1000000) {
+            return readUnsignedInt24(in);
+        } else {
+            return in.readInt();
+        }
+    }
+}