Add spellcheck and word suggestion to the prediction service

third_party/android_prediction/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.cpp

Index: third_party/android_prediction/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.cpp
diff --git a/third_party/android_prediction/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.cpp b/third_party/android_prediction/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b3b069fb2137bf22358d51902b52546fb2ee0eba
--- /dev/null
+++ b/third_party/android_prediction/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.cpp
@@ -0,0 +1,72 @@
+/*
+ * 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 "third_party/android_prediction/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_utils.h"
+
+#include "third_party/android_prediction/defines.h"
+#include "third_party/android_prediction/suggest/policyimpl/dictionary/utils/byte_array_utils.h"
+
+namespace latinime {
+
+const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::MASK_MOVED = 0xC0;
+const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_NOT_MOVED = 0xC0;
+const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_MOVED = 0x40;
+const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_IS_DELETED = 0x80;
+const DynamicPtReadingUtils::NodeFlags DynamicPtReadingUtils::FLAG_WILL_BECOME_NON_TERMINAL = 0x00;
+
+// TODO: Make DICT_OFFSET_ZERO_OFFSET = 0.
+// Currently, DICT_OFFSET_INVALID is 0 in Java side but offset can be 0 during GC. So, the maximum
+// value of offsets, which is 0x7FFFFF is used to represent 0 offset.
+const int DynamicPtReadingUtils::DICT_OFFSET_INVALID = 0;
+const int DynamicPtReadingUtils::DICT_OFFSET_ZERO_OFFSET = 0x7FFFFF;
+
+/* static */ int DynamicPtReadingUtils::getForwardLinkPosition(const uint8_t *const buffer,
+        const int pos) {
+    int linkAddressPos = pos;
+    return ByteArrayUtils::readSint24AndAdvancePosition(buffer, &linkAddressPos);
+}
+
+/* static */ int DynamicPtReadingUtils::getParentPtNodePosOffsetAndAdvancePosition(
+        const uint8_t *const buffer, int *const pos) {
+    return ByteArrayUtils::readSint24AndAdvancePosition(buffer, pos);
+}
+
+/* static */ int DynamicPtReadingUtils::getParentPtNodePos(const int parentOffset,
+        const int ptNodePos) {
+    if (parentOffset == DICT_OFFSET_INVALID) {
+        return NOT_A_DICT_POS;
+    } else if (parentOffset == DICT_OFFSET_ZERO_OFFSET) {
+        return ptNodePos;
+    } else {
+        return parentOffset + ptNodePos;
+    }
+}
+
+/* static */ int DynamicPtReadingUtils::readChildrenPositionAndAdvancePosition(
+        const uint8_t *const buffer, int *const pos) {
+    const int base = *pos;
+    const int offset = ByteArrayUtils::readSint24AndAdvancePosition(buffer, pos);
+    if (offset == DICT_OFFSET_INVALID) {
+        // The PtNode does not have children.
+        return NOT_A_DICT_POS;
+    } else if (offset == DICT_OFFSET_ZERO_OFFSET) {
+        return base;
+    } else {
+        return base + offset;
+    }
+}
+
+} // namespace latinime