diff --git a/native/jni/Android.mk b/native/jni/Android.mk
index 0e36f3d..d83bdad 100644
--- a/native/jni/Android.mk
+++ b/native/jni/Android.mk
@@ -78,6 +78,7 @@
         dynamic_patricia_trie_reading_helper.cpp \
         dynamic_patricia_trie_reading_utils.cpp \
         dynamic_patricia_trie_writing_helper.cpp \
+        dynamic_patricia_trie_writing_utils.cpp \
         patricia_trie_policy.cpp \
         patricia_trie_reading_utils.cpp) \
     $(addprefix suggest/policyimpl/dictionary/utils/, \
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.cpp
index 2042fcb..a2712c3 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.cpp
@@ -72,7 +72,7 @@
     }
     if (DynamicPatriciaTrieReadingUtils::isValidForwardLinkPosition(forwardLinkPosition)) {
         // Follow the forward link.
-        mPos = forwardLinkPosition;
+        mPos += forwardLinkPosition;
         nextNodeArray();
     } else {
         // All node arrays have been read.
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.cpp
index 128d69d..a4793e1 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_helper.cpp
@@ -19,6 +19,7 @@
 #include "suggest/policyimpl/dictionary/bigram/dynamic_bigram_list_policy.h"
 #include "suggest/policyimpl/dictionary/dynamic_patricia_trie_node_reader.h"
 #include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_helper.h"
+#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h"
 #include "suggest/policyimpl/dictionary/shortcut/dynamic_shortcut_list_policy.h"
 
 namespace latinime {
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.cpp
new file mode 100644
index 0000000..4187504
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.cpp
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2013, 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.
+ */
+
+#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h"
+
+#include <cstddef>
+#include <cstdlib>
+#include <stdint.h>
+
+#include "suggest/policyimpl/dictionary/utils/buffer_with_extendable_buffer.h"
+
+namespace latinime {
+
+const size_t DynamicPatriciaTrieWritingUtils::MAX_PTNODE_ARRAY_SIZE_TO_USE_SMALL_SIZE_FIELD = 0x7F;
+const size_t DynamicPatriciaTrieWritingUtils::MAX_PTNODE_ARRAY_SIZE = 0x7FFF;
+const int DynamicPatriciaTrieWritingUtils::SMALL_PTNODE_ARRAY_SIZE_FIELD_SIZE = 1;
+const int DynamicPatriciaTrieWritingUtils::LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE = 2;
+const int DynamicPatriciaTrieWritingUtils::LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE_FLAG = 0x8000;
+const int DynamicPatriciaTrieWritingUtils::DICT_OFFSET_FIELD_SIZE = 3;
+const int DynamicPatriciaTrieWritingUtils::MAX_DICT_OFFSET_VALUE = 0x7FFFFF;
+const int DynamicPatriciaTrieWritingUtils::MIN_DICT_OFFSET_VALUE = -0x7FFFFF;
+const int DynamicPatriciaTrieWritingUtils::DICT_OFFSET_NEGATIVE_FLAG = 0x800000;
+const int DynamicPatriciaTrieWritingUtils::PROBABILITY_FIELD_SIZE = 1;
+const int DynamicPatriciaTrieWritingUtils::NODE_FLAG_FIELD_SIZE = 1;
+
+/* static */ bool DynamicPatriciaTrieWritingUtils::writeForwardLinkPositionAndAdvancePosition(
+        BufferWithExtendableBuffer *const buffer, const int forwardLinkPos,
+        int *const forwardLinkFieldPos) {
+    const int offset = (forwardLinkPos != NOT_A_DICT_POS) ?
+            forwardLinkPos - (*forwardLinkFieldPos) : 0;
+    return writeDictOffset(buffer, offset, forwardLinkFieldPos);
+}
+
+/* static */ bool DynamicPatriciaTrieWritingUtils::writePtNodeArraySizeAndAdvancePosition(
+        BufferWithExtendableBuffer *const buffer, const size_t arraySize,
+        int *const arraySizeFieldPos) {
+    if (arraySize <= MAX_PTNODE_ARRAY_SIZE_TO_USE_SMALL_SIZE_FIELD) {
+        return buffer->writeUintAndAdvancePosition(arraySize, SMALL_PTNODE_ARRAY_SIZE_FIELD_SIZE,
+                arraySizeFieldPos);
+    } else if (arraySize <= MAX_PTNODE_ARRAY_SIZE) {
+        uint32_t data = arraySize | LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE_FLAG;
+        return buffer->writeUintAndAdvancePosition(data, LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE,
+                arraySizeFieldPos);
+    } else {
+        AKLOGI("PtNode array size cannot be written because arraySize is too large: %zd",
+                arraySize);
+        ASSERT(false);
+        return false;
+    }
+}
+
+/* static */ bool DynamicPatriciaTrieWritingUtils::writeFlagsAndAdvancePosition(
+        BufferWithExtendableBuffer *const buffer,
+        const DynamicPatriciaTrieReadingUtils::NodeFlags nodeFlags, int *const nodeFlagsFieldPos) {
+    return buffer->writeUintAndAdvancePosition(nodeFlags, NODE_FLAG_FIELD_SIZE, nodeFlagsFieldPos);
+}
+
+/* static */ bool DynamicPatriciaTrieWritingUtils::writeParentPositionAndAdvancePosition(
+        BufferWithExtendableBuffer *const buffer, const int parentPosition,
+        int *const parentPosFieldPos) {
+    // Note that parentPosition is offset from node's head position.
+    int offset = (parentPosition != NOT_A_DICT_POS) ? parentPosition : 0;
+    return writeDictOffset(buffer, offset, parentPosFieldPos);
+}
+
+/* static */ bool DynamicPatriciaTrieWritingUtils::writeCodePointsAndAdvancePosition(
+        BufferWithExtendableBuffer *const buffer, const int *const codePoints,
+        const int codePointCount, int *const codePointFieldPos) {
+    if (codePointCount <= 0) {
+        AKLOGI("code points cannot be written because codePointCount is invalid: %d",
+                codePointCount);
+        ASSERT(false);
+        return false;
+    }
+    const bool hasMultipleCodePoints = codePointCount > 1;
+    return buffer->writeCodePointsAndAdvancePosition(codePoints, codePointCount,
+            hasMultipleCodePoints, codePointFieldPos);
+}
+
+/* static */ bool DynamicPatriciaTrieWritingUtils::writeProbabilityAndAdvancePosition(
+        BufferWithExtendableBuffer *const buffer, const int probability,
+        int *const probabilityFieldPos) {
+    if (probability < 0 || probability > MAX_PROBABILITY) {
+        AKLOGI("probability cannot be written because the probability is invalid: %d",
+                probability);
+        ASSERT(false);
+        return false;
+    }
+    return buffer->writeUintAndAdvancePosition(probability, PROBABILITY_FIELD_SIZE,
+            probabilityFieldPos);
+}
+
+/* static */ bool DynamicPatriciaTrieWritingUtils::writeChildrenPositionAndAdvancePosition(
+        BufferWithExtendableBuffer *const buffer, const int childrenPosition,
+        int *const childrenPositionFieldPos) {
+    int offset = (childrenPosition != NOT_A_DICT_POS) ?
+            childrenPosition - (*childrenPositionFieldPos) : 0;
+    return writeDictOffset(buffer, offset, childrenPositionFieldPos);
+}
+
+/* static */ bool DynamicPatriciaTrieWritingUtils::writeDictOffset(
+        BufferWithExtendableBuffer *const buffer, const int offset, int *const offsetFieldPos) {
+    if (offset > MAX_DICT_OFFSET_VALUE || offset < MIN_DICT_OFFSET_VALUE) {
+        AKLOGI("offset cannot be written because the offset is too large or too small: %d",
+                offset);
+        ASSERT(false);
+        return false;
+    }
+    uint32_t data = 0;
+    if (offset >= 0) {
+        data = offset;
+    } else {
+        data = abs(offset) | DICT_OFFSET_NEGATIVE_FLAG;
+    }
+    return buffer->writeUintAndAdvancePosition(data, DICT_OFFSET_FIELD_SIZE, offsetFieldPos);
+}
+}
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h
new file mode 100644
index 0000000..801042d
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_writing_utils.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2013, 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.
+ */
+
+#ifndef LATINIME_DYNAMIC_PATRICIA_TRIE_WRITING_UTILS_H
+#define LATINIME_DYNAMIC_PATRICIA_TRIE_WRITING_UTILS_H
+
+#include <cstddef>
+
+#include "defines.h"
+#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_reading_utils.h"
+
+namespace latinime {
+
+class BufferWithExtendableBuffer;
+
+class DynamicPatriciaTrieWritingUtils {
+ public:
+    static bool writeForwardLinkPositionAndAdvancePosition(
+            BufferWithExtendableBuffer *const buffer, const int forwardLinkPos,
+            int *const forwardLinkFieldPos);
+
+    static bool writePtNodeArraySizeAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
+            const size_t arraySize, int *const arraySizeFieldPos);
+
+    static bool writeFlagsAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
+            const DynamicPatriciaTrieReadingUtils::NodeFlags nodeFlags,
+            int *const nodeFlagsFieldPos);
+
+    static bool writeParentPositionAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
+            const int parentPosition, int *const parentPosFieldPos);
+
+    static bool writeCodePointsAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
+            const int *const codePoints, const int codePointCount, int *const codePointFieldPos);
+
+    static bool writeProbabilityAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
+            const int probability, int *const probabilityFieldPos);
+
+    static bool writeChildrenPositionAndAdvancePosition(BufferWithExtendableBuffer *const buffer,
+            const int childrenPosition, int *const childrenPositionFieldPos);
+
+ private:
+    DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPatriciaTrieWritingUtils);
+
+    static const size_t MAX_PTNODE_ARRAY_SIZE_TO_USE_SMALL_SIZE_FIELD;
+    static const size_t MAX_PTNODE_ARRAY_SIZE;
+    static const int SMALL_PTNODE_ARRAY_SIZE_FIELD_SIZE;
+    static const int LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE;
+    static const int LARGE_PTNODE_ARRAY_SIZE_FIELD_SIZE_FLAG;
+    static const int DICT_OFFSET_FIELD_SIZE;
+    static const int MAX_DICT_OFFSET_VALUE;
+    static const int MIN_DICT_OFFSET_VALUE;
+    static const int DICT_OFFSET_NEGATIVE_FLAG;
+    static const int NODE_FLAG_FIELD_SIZE;
+    static const int PROBABILITY_FIELD_SIZE;
+
+    static bool writeDictOffset(BufferWithExtendableBuffer *const buffer, const int offset,
+            int *const offsetFieldPos);
+};
+} // namespace latinime
+#endif /* LATINIME_DYNAMIC_PATRICIA_TRIE_WRITING_UTILS_H */