1 files changed, 94 insertions, 0 deletions
diff --git a/geocoding/area_code_map.cc b/geocoding/area_code_map.cc
new file mode 100644
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--- /dev/null
+++ b/geocoding/area_code_map.cc
@@ -0,0 +1,94 @@
+// Copyright (C) 2012 The Libphonenumber Authors
+//
+// 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.
+//
+// Author: Patrick Mezard
+
+#include "phonenumbers/geocoding/area_code_map.h"
+
+#include <cstddef>
+
+#include "phonenumbers/geocoding/default_map_storage.h"
+#include "phonenumbers/phonenumber.pb.h"
+#include "phonenumbers/phonenumberutil.h"
+#include "phonenumbers/stringutil.h"
+
+namespace i18n {
+namespace phonenumbers {
+
+AreaCodeMap::AreaCodeMap()
+  : phone_util_(*PhoneNumberUtil::GetInstance()) {
+}
+
+AreaCodeMap::~AreaCodeMap() {
+}
+
+void AreaCodeMap::ReadAreaCodeMap(const PrefixDescriptions* descriptions) {
+  DefaultMapStorage* storage = new DefaultMapStorage();
+  storage->ReadFromMap(descriptions);
+  storage_.reset(storage);
+}
+
+const char* AreaCodeMap::Lookup(const PhoneNumber& number) const {
+  const int entries = storage_->GetNumOfEntries();
+  if (!entries) {
+    return NULL;
+  }
+
+  string national_number;
+  phone_util_.GetNationalSignificantNumber(number, &national_number);
+  int64 phone_prefix;
+  safe_strto64(SimpleItoa(number.country_code()) + national_number,
+               &phone_prefix);
+
+  const int* const lengths = storage_->GetPossibleLengths();
+  const int lengths_size = storage_->GetPossibleLengthsSize();
+  int current_index = entries - 1;
+  for (int lengths_index = lengths_size - 1; lengths_index >= 0;
+       --lengths_index) {
+    const int possible_length = lengths[lengths_index];
+    string phone_prefix_str = SimpleItoa(phone_prefix);
+    if (static_cast<int>(phone_prefix_str.length()) > possible_length) {
+      safe_strto64(phone_prefix_str.substr(0, possible_length), &phone_prefix);
+    }
+    current_index = BinarySearch(0, current_index, phone_prefix);
+    if (current_index < 0) {
+      return NULL;
+    }
+    const int32 current_prefix = storage_->GetPrefix(current_index);
+    if (phone_prefix == current_prefix) {
+      return storage_->GetDescription(current_index);
+    }
+  }
+  return NULL;
+}
+
+int AreaCodeMap::BinarySearch(int start, int end, int64 value) const {
+  int current = 0;
+  while (start <= end) {
+    current = (start + end) / 2;
+    int32 current_value = storage_->GetPrefix(current);
+    if (current_value == value) {
+      return current;
+    } else if (current_value > value) {
+      --current;
+      end = current;
+    } else {
+      start = current + 1;
+    }
+  }
+  return current;
+}
+
+}  // namespace phonenumbers
+}  // namespace i18n