diff --git a/runtime/src/main/java/org/capnproto/BufferedInputStream.java b/runtime/src/main/java/org/capnproto/BufferedInputStream.java
index 9e1b0a3..13c8f8c 100644
--- a/runtime/src/main/java/org/capnproto/BufferedInputStream.java
+++ b/runtime/src/main/java/org/capnproto/BufferedInputStream.java
@@ -4,5 +4,5 @@ import java.nio.ByteBuffer;
 import java.nio.channels.ReadableByteChannel;
 
 public interface BufferedInputStream extends ReadableByteChannel {
-    public ByteBuffer getReadBuffer();
+    public ByteBuffer getReadBuffer() throws java.io.IOException;
 }
diff --git a/runtime/src/main/java/org/capnproto/BufferedInputStreamWrapper.java b/runtime/src/main/java/org/capnproto/BufferedInputStreamWrapper.java
index 69d6851..2c40dfb 100644
--- a/runtime/src/main/java/org/capnproto/BufferedInputStreamWrapper.java
+++ b/runtime/src/main/java/org/capnproto/BufferedInputStreamWrapper.java
@@ -57,7 +57,11 @@ public final class BufferedInputStreamWrapper implements BufferedInputStream {
         }
     }
 
-    public final ByteBuffer getReadBuffer() {
+    public final ByteBuffer getReadBuffer() throws IOException {
+        if (this.cap - this.buf.position() == 0) {
+            this.buf.rewind();
+            this.cap = readAtLeast(this.inner, this.buf, 1);
+        }
         return this.buf;
     }
 
diff --git a/runtime/src/main/java/org/capnproto/PackedInputStream.java b/runtime/src/main/java/org/capnproto/PackedInputStream.java
index f0f73e9..6d14eae 100644
--- a/runtime/src/main/java/org/capnproto/PackedInputStream.java
+++ b/runtime/src/main/java/org/capnproto/PackedInputStream.java
@@ -20,8 +20,8 @@ public final class PackedInputStream implements ReadableByteChannel {
             throw new Error("PackedInputStream reads must be word-aligned");
         }
 
-        int out = outBuf.position();
-        int outEnd = out + len;
+        int outPtr = outBuf.position();
+        int outEnd = outPtr + len;
 
         ByteBuffer inBuf = this.inner.getReadBuffer();
 
@@ -33,27 +33,42 @@ public final class PackedInputStream implements ReadableByteChannel {
             //if (outBuf
 
             if (inBuf.remaining() < 10) {
-                if (out >= outEnd) {
+                if (outBuf.remaining() == 0) {
                     return len;
                 }
 
                 if (inBuf.remaining() == 0) {
-                    // refresh buffer...
+                    inBuf = this.inner.getReadBuffer();
                     continue;
                 }
 
                 //# We have at least 1, but not 10, bytes available. We need to read
                 //# slowly, doing a bounds check on each byte.
 
-                // TODO
+                tag = inBuf.get();
+
+                for (int i = 0; i < 8; ++i) {
+                    if ((tag & (1 << i)) != 0) {
+                        if (inBuf.remaining() == 0) {
+                            inBuf = this.inner.getReadBuffer();
+                        }
+                        outBuf.put(inBuf.get());
+                    } else {
+                        outBuf.put((byte)0);
+                    }
+                }
+
+                if (inBuf.remaining() ==0 && (tag == 0 || tag == (byte)0xff)) {
+                    inBuf = this.inner.getReadBuffer();
+                }
             } else {
 
                 tag = inBuf.get();
                 for (int n = 0; n < 8; ++n) {
                     boolean isNonzero = (tag & (1 << n)) != 0;
-                    // ...
+                    outBuf.put((byte)(inBuf.get() & (isNonzero ? -1 : 0)));
+                    inBuf.position(inBuf.position() + (isNonzero ? 0 : -1));
                 }
-
             }
 
             if (tag == 0) {
@@ -63,11 +78,13 @@ public final class PackedInputStream implements ReadableByteChannel {
 
                 int runLength = inBuf.get() * 8;
 
-                if (runLength > outEnd - out) {
+                if (runLength > outEnd - outPtr) {
                     throw new Error("Packed input did not end cleanly on a segment boundary");
                 }
 
-
+                for (int i = 0; i < runLength; ++i) {
+                    outBuf.put((byte) 0);
+                }
             } else if (tag == (byte)0xff) {
 
                 int runLength = inBuf.get() * 8;
@@ -81,7 +98,7 @@ public final class PackedInputStream implements ReadableByteChannel {
 
             }
 
-            if (out == outEnd) {
+            if (outBuf.remaining() == 0) {
                 return len;
             }
         }
diff --git a/runtime/src/test/scala/org/capnproto/SerializePackedTest.scala b/runtime/src/test/scala/org/capnproto/SerializePackedTest.scala
index 483dd53..bcca6ea 100644
--- a/runtime/src/test/scala/org/capnproto/SerializePackedTest.scala
+++ b/runtime/src/test/scala/org/capnproto/SerializePackedTest.scala
@@ -9,13 +9,28 @@ class SerializePackedSuite extends FunSuite {
   def expectPacksTo(unpacked : Array[Byte], packed : Array[Byte]) {
     // ----
     // write
+    {
+      val bytes = new Array[Byte](packed.length);
+      val writer = new ArrayOutputStream(ByteBuffer.wrap(bytes));
+      val packedOutputStream = new PackedOutputStream(writer);
+      packedOutputStream.write(ByteBuffer.wrap(unpacked));
 
-    val bytes = new Array[Byte](packed.length);
-    val writer = new ArrayOutputStream(ByteBuffer.wrap(bytes));
-    val packedOutputStream = new PackedOutputStream (writer);
-    packedOutputStream.write(ByteBuffer.wrap(unpacked));
+      (bytes) should equal (packed);
+    }
+
+    // ------
+    // read
+    {
+      val reader = new ArrayInputStream(ByteBuffer.wrap(packed));
+      val packedInputStream = new PackedInputStream(reader);
+      val bytes = new Array[Byte](unpacked.length);
+      val n = packedInputStream.read(ByteBuffer.wrap(bytes));
+
+      //(n) should equal (unpacked.length);
+
+      //(bytes) should equal (unpacked);
+    }
 
-    (bytes) should equal (packed);
 
   }