Move cros_network_functions.cc to src/chromeos

chromeos/network/network_util.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chromeos/network/network_util.h"
+
+#include "base/string_tokenizer.h"
+#include "base/stringprintf.h"
+
+namespace chromeos {
+
+SMS::SMS() : validity(0), msgclass(0) {
+}
+
+SMS::~SMS() {
+}
+
+WifiAccessPoint::WifiAccessPoint()
+    : signal_strength(0),
+      signal_to_noise(0),
+      channel(0) {
+}
+
+WifiAccessPoint::~WifiAccessPoint() {
+}
+
+namespace network_util {
+
+std::string PrefixLengthToNetmask(int32 prefix_length) {
+  std::string netmask;
+  // Return the empty string for invalid inputs.
+  if (prefix_length < 0 || prefix_length > 32)
+    return netmask;
+  for (int i = 0; i < 4; i++) {
+    int remainder = 8;
+    if (prefix_length >= 8) {
+      prefix_length -= 8;
+    } else {
+      remainder = prefix_length;
+      prefix_length = 0;
+    }
+    if (i > 0)
+      netmask += ".";
+    int value = remainder == 0 ? 0 :
+        ((2L << (remainder - 1)) - 1) << (8 - remainder);
+    netmask += StringPrintf("%d", value);
+  }
+  return netmask;
+}
+
+int32 NetmaskToPrefixLength(const std::string& netmask) {
+  int count = 0;
+  int prefix_length = 0;
+  StringTokenizer t(netmask, ".");
+  while (t.GetNext()) {
+    // If there are more than 4 numbers, then it's invalid.
+    if (count == 4)
+      return -1;
+
+    std::string token = t.token();
+    // If we already found the last mask and the current one is not
+    // "0" then the netmask is invalid. For example, 255.224.255.0
+    if (prefix_length / 8 != count) {
+      if (token != "0")
+        return -1;
+    } else if (token == "255") {
+      prefix_length += 8;
+    } else if (token == "254") {
+      prefix_length += 7;
+    } else if (token == "252") {
+      prefix_length += 6;
+    } else if (token == "248") {
+      prefix_length += 5;
+    } else if (token == "240") {
+      prefix_length += 4;
+    } else if (token == "224") {
+      prefix_length += 3;
+    } else if (token == "192") {
+      prefix_length += 2;
+    } else if (token == "128") {
+      prefix_length += 1;
+    } else if (token == "0") {
+      prefix_length += 0;
+    } else {
+      // mask is not a valid number.
+      return -1;
+    }
+    count++;
+  }
+  if (count < 4)
+    return -1;
+  return prefix_length;
+}
+
+}  // namespace network_util
+}  // namespace chromeos