mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
202 lines
5.3 KiB
JavaScript
202 lines
5.3 KiB
JavaScript
/* Copyright 2012 Mozilla Foundation and Mozilla contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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if (!this.ctypes) {
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// We're likely being loaded as a JSM.
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this.EXPORTED_SYMBOLS = [ "libcutils", "netHelpers" ];
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Components.utils.import("resource://gre/modules/ctypes.jsm");
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}
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const SYSTEM_PROPERTY_KEY_MAX = 32;
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const SYSTEM_PROPERTY_VALUE_MAX = 92;
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// We leave this as 'undefined' instead of setting it to 'false'. That
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// way a file that includes us can have it defined already without us
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// overriding the value here.
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var DEBUG;
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/**
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* Expose some system-level functions.
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*/
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this.libcutils = (function() {
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let lib;
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try {
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lib = ctypes.open("libcutils.so");
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} catch(ex) {
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// Return a fallback option in case libcutils.so isn't present (e.g.
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// when building Firefox with MOZ_B2G_RIL.
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if (DEBUG) {
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dump("Could not load libcutils.so. Using fake propdb.\n");
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}
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let fake_propdb = Object.create(null);
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return {
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property_get: function(key, defaultValue) {
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if (key in fake_propdb) {
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return fake_propdb[key];
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}
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return defaultValue === undefined ? null : defaultValue;
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},
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property_set: function(key, value) {
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fake_propdb[key] = value;
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}
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};
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}
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let c_property_get = lib.declare("property_get", ctypes.default_abi,
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ctypes.int, // return value: length
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ctypes.char.ptr, // key
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ctypes.char.ptr, // value
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ctypes.char.ptr); // default
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let c_property_set = lib.declare("property_set", ctypes.default_abi,
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ctypes.int, // return value: success
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ctypes.char.ptr, // key
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ctypes.char.ptr); // value
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let c_value_buf = ctypes.char.array(SYSTEM_PROPERTY_VALUE_MAX)();
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return {
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/**
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* Get a system property.
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*
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* @param key
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* Name of the property
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* @param defaultValue [optional]
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* Default value to return if the property isn't set (default: null)
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*/
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property_get: function(key, defaultValue) {
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if (defaultValue === undefined) {
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defaultValue = null;
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}
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c_property_get(key, c_value_buf, defaultValue);
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return c_value_buf.readString();
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},
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/**
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* Set a system property
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*
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* @param key
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* Name of the property
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* @param value
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* Value to set the property to.
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*/
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property_set: function(key, value) {
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let rv = c_property_set(key, value);
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if (rv) {
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throw Error('libcutils.property_set("' + key + '", "' + value +
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'") failed with error ' + rv);
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}
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}
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};
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})();
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/**
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* Helpers for conversions.
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*/
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this.netHelpers = {
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/**
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* Swap byte orders for 32-bit value
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*/
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swap32: function(n) {
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return (((n >> 24) & 0xFF) << 0) |
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(((n >> 16) & 0xFF) << 8) |
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(((n >> 8) & 0xFF) << 16) |
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(((n >> 0) & 0xFF) << 24);
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},
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/**
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* Convert network byte order to host byte order
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* Note: Assume that the system is little endian
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*/
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ntohl: function(n) {
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return this.swap32(n);
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},
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/**
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* Convert host byte order to network byte order
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* Note: Assume that the system is little endian
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*/
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htonl: function(n) {
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return this.swap32(n);
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},
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/**
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* Convert integer representation of an IP address to the string
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* representation.
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*
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* @param ip
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* IP address in number format.
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*/
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ipToString: function(ip) {
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return ((ip >> 0) & 0xFF) + "." +
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((ip >> 8) & 0xFF) + "." +
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((ip >> 16) & 0xFF) + "." +
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((ip >> 24) & 0xFF);
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},
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/**
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* Convert string representation of an IP address to the integer
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* representation (network byte order).
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*
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* @param string
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* String containing the IP address.
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*/
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stringToIP: function(string) {
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if (!string) {
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return null;
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}
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let ip = 0;
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let start, end = -1;
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for (let i = 0; i < 4; i++) {
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start = end + 1;
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end = string.indexOf(".", start);
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if (end == -1) {
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end = string.length;
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}
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let num = parseInt(string.slice(start, end), 10);
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if (isNaN(num)) {
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return null;
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}
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ip |= num << (i * 8);
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}
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return ip;
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},
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/**
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* Make a subnet mask.
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*/
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makeMask: function(len) {
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let mask = 0;
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for (let i = 0; i < len; ++i) {
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mask |= (0x80000000 >> i);
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}
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return this.ntohl(mask);
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},
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/**
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* Get Mask length from given mask address
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*/
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getMaskLength: function(mask) {
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let len = 0;
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let netmask = this.ntohl(mask);
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while (netmask & 0x80000000) {
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len++;
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netmask = netmask << 1;
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}
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return len;
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}
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};
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