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// 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/strings/string_tokenizer.h"
#include "base/strings/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 += base::StringPrintf("%d", value);
}
return netmask;
}
int32 NetmaskToPrefixLength(const std::string& netmask) {
int count = 0;
int prefix_length = 0;
base::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
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