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libdtn-devel-2.6.0-2mdv2009.1.i586.rpm

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<h1>FragmentState.cc</h1><a href="FragmentState_8cc.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> *    Copyright 2004-2006 Intel Corporation</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">#ifdef HAVE_CONFIG_H</span>
<a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor">#  include &lt;<a class="code" href="dtn-config_8h.html">dtn-config.h</a>&gt;</span>
<a name="l00019"></a>00019 <span class="preprocessor">#endif</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include "<a class="code" href="bundling_2Bundle_8h.html">Bundle.h</a>"</span>
<a name="l00022"></a>00022 <span class="preprocessor">#include "<a class="code" href="FragmentState_8h.html">FragmentState.h</a>"</span>
<a name="l00023"></a>00023 
<a name="l00024"></a>00024 <span class="keyword">namespace </span>dtn {
<a name="l00025"></a>00025 
<a name="l00026"></a>00026 <span class="comment">//----------------------------------------------------------------------</span>
<a name="l00027"></a>00027 <span class="keywordtype">void</span>
<a name="l00028"></a><a class="code" href="classdtn_1_1FragmentState.html#cec4c98230bf6a2f84184d227329f36a">00028</a> <a class="code" href="classdtn_1_1FragmentState.html#cec4c98230bf6a2f84184d227329f36a">FragmentState::add_fragment</a>(<a class="code" href="classdtn_1_1Bundle.html" title="The internal representation of a bundle.">Bundle</a>* fragment)
<a name="l00029"></a>00029 {
<a name="l00030"></a>00030     <a class="code" href="classdtn_1_1FragmentState.html#17a44758c6f7b4eed45ef67567e54c59" title="List of partial fragments.">fragments_</a>.<a class="code" href="classdtn_1_1BundleList.html#b9b4a6a57883a5df56779c5ee633434f" title="Insert the given bundle sorted by the given sort method.">insert_sorted</a>(fragment, <a class="code" href="classdtn_1_1BundleList.html#d2d5945081bd01b79d0cc2763f777f9cb2a2c26a05eb8ccc46223f08f368e744" title="Sort by fragment offset.">BundleList::SORT_FRAG_OFFSET</a>);
<a name="l00031"></a>00031 }
<a name="l00032"></a>00032 
<a name="l00033"></a>00033 <span class="comment">//----------------------------------------------------------------------</span>
<a name="l00034"></a>00034 <span class="keywordtype">bool</span>
<a name="l00035"></a><a class="code" href="classdtn_1_1FragmentState.html#3ae540418ab1e8bd1e60dab0a299d9f9">00035</a> <a class="code" href="classdtn_1_1FragmentState.html#3ae540418ab1e8bd1e60dab0a299d9f9">FragmentState::erase_fragment</a>(<a class="code" href="classdtn_1_1Bundle.html" title="The internal representation of a bundle.">Bundle</a>* fragment) 
<a name="l00036"></a>00036 {
<a name="l00037"></a>00037     <span class="keywordflow">return</span> <a class="code" href="classdtn_1_1FragmentState.html#17a44758c6f7b4eed45ef67567e54c59" title="List of partial fragments.">fragments_</a>.<a class="code" href="classdtn_1_1BundleList.html#b0171458e14d67307b74f98447062d68" title="Remove the given bundle from the list.">erase</a>(fragment);
<a name="l00038"></a>00038 }
<a name="l00039"></a>00039 
<a name="l00040"></a>00040 <span class="comment">//----------------------------------------------------------------------</span>
<a name="l00041"></a>00041 <span class="keywordtype">bool</span>
<a name="l00042"></a><a class="code" href="classdtn_1_1FragmentState.html#fe6b05c70df4f3c855e8368cd59e2e66">00042</a> <a class="code" href="classdtn_1_1FragmentState.html#fe6b05c70df4f3c855e8368cd59e2e66">FragmentState::check_completed</a>()<span class="keyword"> const</span>
<a name="l00043"></a>00043 <span class="keyword"></span>{
<a name="l00044"></a>00044     <a class="code" href="classdtn_1_1Bundle.html" title="The internal representation of a bundle.">Bundle</a>* fragment;
<a name="l00045"></a>00045     <a class="code" href="classdtn_1_1BundleList.html#1d52b8d6bb7d8a07e5d4f5fc4b5b61d2" title="Type for an iterator, which just wraps an stl iterator.">BundleList::iterator</a> iter;
<a name="l00046"></a>00046     oasys::ScopeLock l(<a class="code" href="classdtn_1_1FragmentState.html#17a44758c6f7b4eed45ef67567e54c59" title="List of partial fragments.">fragments_</a>.<a class="code" href="classdtn_1_1BundleList.html#0d0c9f789f0f7f7d1cda3b4ecf32d2bc" title="Return the internal lock on this list.">lock</a>(),
<a name="l00047"></a>00047                        <span class="stringliteral">"FragmentState::check_completed"</span>);
<a name="l00048"></a>00048     
<a name="l00049"></a>00049     <span class="keywordtype">size_t</span> done_up_to = 0;  <span class="comment">// running total of completed reassembly</span>
<a name="l00050"></a>00050     <span class="keywordtype">size_t</span> f_len;
<a name="l00051"></a>00051     <span class="keywordtype">size_t</span> f_offset;
<a name="l00052"></a>00052     <span class="keywordtype">size_t</span> f_origlen;
<a name="l00053"></a>00053 
<a name="l00054"></a>00054     <span class="keywordtype">size_t</span> total_len = <a class="code" href="classdtn_1_1FragmentState.html#c37518574a01bd5126e3440126c8ae8c" title="The bundle to eb.">bundle_</a>-&gt;payload().length();
<a name="l00055"></a>00055     
<a name="l00056"></a>00056     <span class="keywordtype">int</span> fragi = 0;
<a name="l00057"></a>00057     <span class="keywordtype">int</span> fragn = <a class="code" href="classdtn_1_1FragmentState.html#17a44758c6f7b4eed45ef67567e54c59" title="List of partial fragments.">fragments_</a>.<a class="code" href="classdtn_1_1BundleList.html#3c50c6f421631a4dd72b7b77b0660bc3" title="Return the size of the list.">size</a>();
<a name="l00058"></a>00058     (void)fragn; <span class="comment">// in case NDEBUG is defined</span>
<a name="l00059"></a>00059 
<a name="l00060"></a>00060     <span class="keywordflow">for</span> (iter = <a class="code" href="classdtn_1_1FragmentState.html#17a44758c6f7b4eed45ef67567e54c59" title="List of partial fragments.">fragments_</a>.<a class="code" href="classdtn_1_1BundleList.html#24cd371acd62f2f9725ff3f92b55badf" title="Iterator used to iterate through the list.">begin</a>();
<a name="l00061"></a>00061          iter != <a class="code" href="classdtn_1_1FragmentState.html#17a44758c6f7b4eed45ef67567e54c59" title="List of partial fragments.">fragments_</a>.<a class="code" href="classdtn_1_1BundleList.html#19f95941fe436d25ba49ae0b2d8bf2c1" title="Iterator used to mark the end of the list.">end</a>();
<a name="l00062"></a>00062          ++iter, ++fragi)
<a name="l00063"></a>00063     {
<a name="l00064"></a>00064         fragment = *iter;
<a name="l00065"></a>00065 
<a name="l00066"></a>00066         f_len = fragment-&gt;<a class="code" href="classdtn_1_1Bundle.html#3bc0b88b547620b4029eba4809a73447" title="Accessors.">payload</a>().<a class="code" href="classdtn_1_1BundlePayload.html#56b3851ad789c4dbf019a32d557b7453" title="The payload length.">length</a>();
<a name="l00067"></a>00067         f_offset = fragment-&gt;<a class="code" href="classdtn_1_1Bundle.html#76cf6a44f566aa22e2a98007bf233ee2" title="Accessors.">frag_offset</a>();
<a name="l00068"></a>00068         f_origlen = fragment-&gt;<a class="code" href="classdtn_1_1Bundle.html#e32f3c57057214a1763dfe7709160cf8" title="Accessors.">orig_length</a>();
<a name="l00069"></a>00069         
<a name="l00070"></a>00070         <a class="code" href="SDNV_8cc.html#ca68c0d4ac8df0838e209fb5300f7be3">ASSERT</a>(fragment-&gt;<a class="code" href="classdtn_1_1Bundle.html#d6c74eba219bfe55854cf7a90e210cca" title="Accessors.">is_fragment</a>());
<a name="l00071"></a>00071         
<a name="l00072"></a>00072         <span class="keywordflow">if</span> (f_origlen != total_len) {
<a name="l00073"></a>00073             PANIC(<span class="stringliteral">"check_completed: error fragment orig len %zu != total %zu"</span>,
<a name="l00074"></a>00074                   f_origlen, total_len);
<a name="l00075"></a>00075             <span class="comment">// XXX/demmer deal with this</span>
<a name="l00076"></a>00076         }
<a name="l00077"></a>00077 
<a name="l00078"></a>00078         <span class="keywordflow">if</span> (done_up_to == f_offset) {
<a name="l00079"></a>00079             <span class="comment">/*</span>
<a name="l00080"></a>00080 <span class="comment">             * fragment is adjacent to the bytes so far</span>
<a name="l00081"></a>00081 <span class="comment">             * bbbbbbbbbb</span>
<a name="l00082"></a>00082 <span class="comment">             *           fff</span>
<a name="l00083"></a>00083 <span class="comment">             */</span>
<a name="l00084"></a>00084             log_debug(<span class="stringliteral">"check_completed fragment %d/%d: "</span>
<a name="l00085"></a>00085                       <span class="stringliteral">"offset %zu len %zu total %zu done_up_to %zu: "</span>
<a name="l00086"></a>00086                       <span class="stringliteral">"(perfect fit)"</span>,
<a name="l00087"></a>00087                       fragi, fragn, f_offset, f_len, f_origlen, done_up_to);
<a name="l00088"></a>00088             done_up_to += f_len;
<a name="l00089"></a>00089         }
<a name="l00090"></a>00090 
<a name="l00091"></a>00091         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (done_up_to &lt; f_offset) {
<a name="l00092"></a>00092             <span class="comment">/*</span>
<a name="l00093"></a>00093 <span class="comment">             * there's a gap</span>
<a name="l00094"></a>00094 <span class="comment">             * bbbbbbb ffff</span>
<a name="l00095"></a>00095 <span class="comment">             */</span>
<a name="l00096"></a>00096             log_debug(<span class="stringliteral">"check_completed fragment %d/%d: "</span>
<a name="l00097"></a>00097                       <span class="stringliteral">"offset %zu len %zu total %zu done_up_to %zu: "</span>
<a name="l00098"></a>00098                       <span class="stringliteral">"(found a hole)"</span>,
<a name="l00099"></a>00099                       fragi, fragn, f_offset, f_len, f_origlen, done_up_to);
<a name="l00100"></a>00100             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00101"></a>00101 
<a name="l00102"></a>00102         }
<a name="l00103"></a>00103 
<a name="l00104"></a>00104         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (done_up_to &gt; (f_offset + f_len)) {
<a name="l00105"></a>00105             <span class="comment">/* fragment is completely redundant, skip</span>
<a name="l00106"></a>00106 <span class="comment">             * bbbbbbbbbb</span>
<a name="l00107"></a>00107 <span class="comment">             *      fffff</span>
<a name="l00108"></a>00108 <span class="comment">             */</span>
<a name="l00109"></a>00109             log_debug(<span class="stringliteral">"check_completed fragment %d/%d: "</span>
<a name="l00110"></a>00110                       <span class="stringliteral">"offset %zu len %zu total %zu done_up_to %zu: "</span>
<a name="l00111"></a>00111                       <span class="stringliteral">"(redundant fragment)"</span>,
<a name="l00112"></a>00112                       fragi, fragn, f_offset, f_len, f_origlen, done_up_to);
<a name="l00113"></a>00113             <span class="keywordflow">continue</span>;
<a name="l00114"></a>00114         }
<a name="l00115"></a>00115         
<a name="l00116"></a>00116         <span class="keywordflow">else</span> <span class="keywordflow">if</span> (done_up_to &gt; f_offset) {
<a name="l00117"></a>00117             <span class="comment">/*</span>
<a name="l00118"></a>00118 <span class="comment">             * there's some overlap, so reduce f_len accordingly</span>
<a name="l00119"></a>00119 <span class="comment">             * bbbbbbbbbb</span>
<a name="l00120"></a>00120 <span class="comment">             *      fffffff</span>
<a name="l00121"></a>00121 <span class="comment">             */</span>
<a name="l00122"></a>00122             log_debug(<span class="stringliteral">"check_completed fragment %d/%d: "</span>
<a name="l00123"></a>00123                       <span class="stringliteral">"offset %zu len %zu total %zu done_up_to %zu: "</span>
<a name="l00124"></a>00124                       <span class="stringliteral">"(overlapping fragment, reducing len to %zu)"</span>,
<a name="l00125"></a>00125                       fragi, fragn, f_offset, f_len, f_origlen, done_up_to,
<a name="l00126"></a>00126                       (f_len - (done_up_to - f_offset)));
<a name="l00127"></a>00127             
<a name="l00128"></a>00128             f_len -= (done_up_to - f_offset);
<a name="l00129"></a>00129             done_up_to += f_len;
<a name="l00130"></a>00130         }
<a name="l00131"></a>00131 
<a name="l00132"></a>00132         <span class="keywordflow">else</span> {
<a name="l00133"></a>00133             <span class="comment">// all cases should be covered above</span>
<a name="l00134"></a>00134             NOTREACHED;
<a name="l00135"></a>00135         }
<a name="l00136"></a>00136     }
<a name="l00137"></a>00137 
<a name="l00138"></a>00138     <span class="keywordflow">if</span> (done_up_to == total_len) {
<a name="l00139"></a>00139         log_debug(<span class="stringliteral">"check_completed reassembly complete!"</span>);
<a name="l00140"></a>00140         <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00141"></a>00141     } <span class="keywordflow">else</span> {
<a name="l00142"></a>00142         log_debug(<span class="stringliteral">"check_completed reassembly not done (got %zu/%zu)"</span>,
<a name="l00143"></a>00143                   done_up_to, total_len);
<a name="l00144"></a>00144         <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00145"></a>00145     }
<a name="l00146"></a>00146 }
<a name="l00147"></a>00147 
<a name="l00148"></a>00148 } <span class="comment">// namespace dtn</span>
<a name="l00149"></a>00149     
</pre></div></div>
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