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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<div id="projectname">Nimbus
 <span id="projectnumber">0.6.1 - <a href="http://github.com/jverkoey/nimbus">Nimbus is proudly hosted on Github</a></span>
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<div class="title">/Users/featherless/workbench/ios/nimbus/src/overview/src/NIDeviceInfo.m</div> </div>
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<div class="contents">
<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">//</span>
<a name="l00002"></a>00002 <span class="comment">// Copyright 2011 Jeff Verkoeyen</span>
<a name="l00003"></a>00003 <span class="comment">//</span>
<a name="l00004"></a>00004 <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span>
<a name="l00005"></a>00005 <span class="comment">// you may not use this file except in compliance with the License.</span>
<a name="l00006"></a>00006 <span class="comment">// You may obtain a copy of the License at</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span>
<a name="l00009"></a>00009 <span class="comment">//</span>
<a name="l00010"></a>00010 <span class="comment">// Unless required by applicable law or agreed to in writing, software</span>
<a name="l00011"></a>00011 <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span>
<a name="l00012"></a>00012 <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<a name="l00013"></a>00013 <span class="comment">// See the License for the specific language governing permissions and</span>
<a name="l00014"></a>00014 <span class="comment">// limitations under the License.</span>
<a name="l00015"></a>00015 <span class="comment">//</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="preprocessor">#import "NIDeviceInfo.h"</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="preprocessor">#import "NimbusCore.h"</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="preprocessor">#import <mach/mach.h></span>
<a name="l00022"></a>00022 <span class="preprocessor">#import <mach/mach_host.h></span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="comment">// Static local state.</span>
<a name="l00025"></a>00025 <span class="keyword">static</span> BOOL sIsCaching = NO;
<a name="l00026"></a>00026 <span class="keyword">static</span> BOOL sLastUpdateResult = NO;
<a name="l00027"></a>00027 <span class="keyword">static</span> vm_size_t sPageSize = 0;
<a name="l00028"></a>00028 <span class="keyword">static</span> vm_statistics_data_t sVMStats;
<a name="l00029"></a>00029 <span class="keyword">static</span> NSDictionary* sFileSystem = nil;
<a name="l00030"></a>00030
<a name="l00031"></a>00031
<a name="l00033"></a>00033 <a class="code" href="class_n_s_string.html" title="For manipulating NSStrings.">NSString</a>* NIStringFromBytes(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> bytes) {
<a name="l00034"></a>00034 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">void</span>* sOrdersOfMagnitude[] = {
<a name="l00035"></a>00035 <span class="stringliteral">@"bytes"</span>, <span class="stringliteral">@"KB"</span>, <span class="stringliteral">@"MB"</span>, <span class="stringliteral">@"GB"</span>
<a name="l00036"></a>00036 };
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="comment">// Determine what magnitude the number of bytes is by shifting off 10 bits at a time</span>
<a name="l00039"></a>00039 <span class="comment">// (equivalent to dividing by 1024).</span>
<a name="l00040"></a>00040 NSInteger magnitude = 0;
<a name="l00041"></a>00041 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> highbits = bytes;
<a name="l00042"></a>00042 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> inverseBits = ~((<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> long)0x3FF);
<a name="l00043"></a>00043 <span class="keywordflow">while</span> ((highbits & inverseBits)
<a name="l00044"></a>00044 && magnitude + 1 < (sizeof(sOrdersOfMagnitude) / sizeof(<span class="keywordtype">void</span> *))) {
<a name="l00045"></a>00045 <span class="comment">// Shift off an order of magnitude.</span>
<a name="l00046"></a>00046 highbits >>= 10;
<a name="l00047"></a>00047 magnitude++;
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="keywordflow">if</span> (magnitude > 0) {
<a name="l00051"></a>00051 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> dividend = 1024 << (magnitude - 1) * 10;
<a name="l00052"></a>00052 <span class="keywordtype">double</span> result = ((double)bytes / (<span class="keywordtype">double</span>)(dividend));
<a name="l00053"></a>00053 <span class="keywordflow">return</span> [<a class="code" href="class_n_s_string.html" title="For manipulating NSStrings.">NSString</a> stringWithFormat:@"%.2f %@",
<a name="l00054"></a>00054 result,
<a name="l00055"></a>00055 sOrdersOfMagnitude[magnitude]];
<a name="l00056"></a>00056
<a name="l00057"></a>00057 } <span class="keywordflow">else</span> {
<a name="l00058"></a>00058 <span class="comment">// We don't need to bother with dividing bytes.</span>
<a name="l00059"></a>00059 <span class="keywordflow">return</span> [<a class="code" href="class_n_s_string.html" title="For manipulating NSStrings.">NSString</a> stringWithFormat:@"%lld %@", bytes, sOrdersOfMagnitude[magnitude]];
<a name="l00060"></a>00060 }
<a name="l00061"></a>00061 }
<a name="l00062"></a>00062
<a name="l00063"></a>00063
<a name="l00067"></a>00067 <span class="keyword">@implementation </span><a class="code" href="interface_n_i_device_info.html" title="An interface for accessing device information.">NIDeviceInfo</a>
<a name="l00068"></a>00068
<a name="l00069"></a>00069
<a name="l00071"></a>00071 + (void)initialize {
<a name="l00072"></a>00072 [[UIDevice currentDevice] setBatteryMonitoringEnabled:YES];
<a name="l00073"></a>00073 memset(&sVMStats, 0, <span class="keyword">sizeof</span>(sVMStats));
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075
<a name="l00076"></a>00076
<a name="l00078"></a>00078 + (BOOL)updateHostStatistics {
<a name="l00079"></a>00079 mach_port_t host_port = mach_host_self();
<a name="l00080"></a>00080 mach_msg_type_number_t host_size = <span class="keyword">sizeof</span>(vm_statistics_data_t) / <span class="keyword">sizeof</span>(integer_t);
<a name="l00081"></a>00081 host_page_size(host_port, &sPageSize);
<a name="l00082"></a>00082 <span class="keywordflow">return</span> (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&sVMStats, &host_size)
<a name="l00083"></a>00083 == KERN_SUCCESS);
<a name="l00084"></a>00084 }
<a name="l00085"></a>00085
<a name="l00086"></a>00086
<a name="l00088"></a>00088 + (BOOL)updateFileSystemAttributes {
<a name="l00089"></a>00089 <a class="code" href="group___preprocessor-_macros.html#ga5d2e99251aeb3ddb687e27f72336e5db" title="Release and assign nil to an object.">NI_RELEASE_SAFELY</a>(sFileSystem);
<a name="l00090"></a>00090
<a name="l00091"></a>00091 NSError* error = nil;
<a name="l00092"></a>00092 <span class="comment">// This path could be any path that is on the device's local disk.</span>
<a name="l00093"></a>00093 NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="comment">// Fetch the file system information based on the path given (the user's documents directory).</span>
<a name="l00096"></a>00096 sFileSystem =
<a name="l00097"></a>00097 [[[NSFileManager defaultManager] attributesOfFileSystemForPath: [paths lastObject]
<a name="l00098"></a>00098 error: &error] retain];
<a name="l00099"></a>00099 <span class="keywordflow">return</span> (nil == error);
<a name="l00100"></a>00100 }
<a name="l00101"></a>00101
<a name="l00102"></a>00102
<a name="l00105"></a>00105 <span class="preprocessor">#pragma mark -</span>
<a name="l00106"></a>00106 <span class="preprocessor"></span><span class="preprocessor">#pragma mark Public Methods</span>
<a name="l00107"></a>00107 <span class="preprocessor"></span>
<a name="l00108"></a>00108
<a name="l00110"></a><a class="code" href="interface_n_i_device_info.html#a8be91b6d997ac7bb82d8edcde4e76d04">00110</a> + (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> long)<a class="code" href="interface_n_i_device_info.html#a8be91b6d997ac7bb82d8edcde4e76d04" title="The number of bytes in memory that are free.">bytesOfFreeMemory</a> {
<a name="l00111"></a>00111 <span class="keywordflow">if</span> (!sIsCaching && ![<span class="keyword">self</span> updateHostStatistics]) {
<a name="l00112"></a>00112 <span class="keywordflow">return</span> 0;
<a name="l00113"></a>00113 }
<a name="l00114"></a>00114 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> mem_free = ((<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> long)sVMStats.free_count
<a name="l00115"></a>00115 * (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span>)sPageSize);
<a name="l00116"></a>00116 <span class="keywordflow">return</span> mem_free;
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118
<a name="l00119"></a>00119
<a name="l00121"></a><a class="code" href="interface_n_i_device_info.html#a982c32e482332f026680faa107d87791">00121</a> + (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> long)<a class="code" href="interface_n_i_device_info.html#a982c32e482332f026680faa107d87791" title="The total number of bytes of memory.">bytesOfTotalMemory</a> {
<a name="l00122"></a>00122 <span class="keywordflow">if</span> (!sIsCaching && ![<span class="keyword">self</span> updateHostStatistics]) {
<a name="l00123"></a>00123 <span class="keywordflow">return</span> 0;
<a name="l00124"></a>00124 }
<a name="l00125"></a>00125 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> mem_free = (((<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> long)sVMStats.free_count
<a name="l00126"></a>00126 + (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span>)sVMStats.active_count
<a name="l00127"></a>00127 + (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> long)sVMStats.inactive_count
<a name="l00128"></a>00128 + (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span>)sVMStats.wire_count)
<a name="l00129"></a>00129 * (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span>)sPageSize);
<a name="l00130"></a>00130 <span class="keywordflow">return</span> mem_free;
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132
<a name="l00133"></a>00133
<a name="l00135"></a><a class="code" href="interface_n_i_device_info.html#a37b58dc9d49ebd7801a7d905fb324e35">00135</a> + (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> long)<a class="code" href="interface_n_i_device_info.html#a37b58dc9d49ebd7801a7d905fb324e35" title="The number of bytes free on disk.">bytesOfFreeDiskSpace</a> {
<a name="l00136"></a>00136 <span class="keywordflow">if</span> (!sIsCaching && ![<span class="keyword">self</span> updateFileSystemAttributes]) {
<a name="l00137"></a>00137 <span class="keywordflow">return</span> 0;
<a name="l00138"></a>00138 }
<a name="l00139"></a>00139 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> bytes = 0;
<a name="l00140"></a>00140
<a name="l00141"></a>00141 NSNumber* number = [sFileSystem objectForKey:NSFileSystemFreeSize];
<a name="l00142"></a>00142 bytes = [number unsignedLongLongValue];
<a name="l00143"></a>00143
<a name="l00144"></a>00144 <span class="keywordflow">return</span> bytes;
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146
<a name="l00147"></a>00147
<a name="l00149"></a><a class="code" href="interface_n_i_device_info.html#a549f7270f58c07f547f444c59591af0d">00149</a> + (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> long)<a class="code" href="interface_n_i_device_info.html#a549f7270f58c07f547f444c59591af0d" title="The total number of bytes of disk space.">bytesOfTotalDiskSpace</a> {
<a name="l00150"></a>00150 <span class="keywordflow">if</span> (!sIsCaching && ![<span class="keyword">self</span> updateFileSystemAttributes]) {
<a name="l00151"></a>00151 <span class="keywordflow">return</span> 0;
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> bytes = 0;
<a name="l00154"></a>00154
<a name="l00155"></a>00155 NSNumber* number = [sFileSystem objectForKey:NSFileSystemSize];
<a name="l00156"></a>00156 bytes = [number unsignedLongLongValue];
<a name="l00157"></a>00157
<a name="l00158"></a>00158 <span class="keywordflow">return</span> bytes;
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160
<a name="l00161"></a>00161
<a name="l00163"></a><a class="code" href="interface_n_i_device_info.html#aac3e7de49c3387e6bc9cce52c98c4095">00163</a> + (CGFloat)<a class="code" href="interface_n_i_device_info.html#aac3e7de49c3387e6bc9cce52c98c4095" title="The battery charge level in the range 0 .">batteryLevel</a> {
<a name="l00164"></a>00164 <span class="keywordflow">return</span> [[UIDevice currentDevice] batteryLevel];
<a name="l00165"></a>00165 }
<a name="l00166"></a>00166
<a name="l00167"></a>00167
<a name="l00169"></a><a class="code" href="interface_n_i_device_info.html#a734cb59e6d82f2d061efde4c7c4fa5ba">00169</a> + (UIDeviceBatteryState)<a class="code" href="interface_n_i_device_info.html#a734cb59e6d82f2d061efde4c7c4fa5ba" title="The current battery state.">batteryState</a> {
<a name="l00170"></a>00170 <span class="keywordflow">return</span> [[UIDevice currentDevice] batteryState];
<a name="l00171"></a>00171 }
<a name="l00172"></a>00172
<a name="l00173"></a>00173
<a name="l00176"></a>00176 <span class="preprocessor">#pragma mark -</span>
<a name="l00177"></a>00177 <span class="preprocessor"></span><span class="preprocessor">#pragma mark Caching</span>
<a name="l00178"></a>00178 <span class="preprocessor"></span>
<a name="l00179"></a>00179
<a name="l00181"></a><a class="code" href="interface_n_i_device_info.html#a4b73fff9581e347814d98ad1e25d5319">00181</a> + (BOOL)<a class="code" href="interface_n_i_device_info.html#a4b73fff9581e347814d98ad1e25d5319" title="Fetches the device's current information and then caches it.">beginCachedDeviceInfo</a> {
<a name="l00182"></a>00182 <span class="keywordflow">if</span> (!sIsCaching) {
<a name="l00183"></a>00183 sIsCaching = YES;
<a name="l00184"></a>00184
<a name="l00185"></a>00185 sLastUpdateResult = [<span class="keyword">self</span> updateHostStatistics];
<a name="l00186"></a>00186 sLastUpdateResult = ([<span class="keyword">self</span> updateFileSystemAttributes] && sLastUpdateResult);
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188
<a name="l00189"></a>00189 <span class="keywordflow">return</span> sLastUpdateResult;
<a name="l00190"></a>00190 }
<a name="l00191"></a>00191
<a name="l00192"></a>00192
<a name="l00194"></a><a class="code" href="interface_n_i_device_info.html#a7ae5b7746fd3c4f6559a6aeb5b63b210">00194</a> + (void)<a class="code" href="interface_n_i_device_info.html#a7ae5b7746fd3c4f6559a6aeb5b63b210" title="Stop using the cache for the device info methods.">endCachedDeviceInfo</a> {
<a name="l00195"></a>00195 sIsCaching = NO;
<a name="l00196"></a>00196 }
<a name="l00197"></a>00197
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="keyword">@end</span>
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