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<h1>SDNV.cc</h1><a href="SDNV_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 2005-2006 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="comment">/*</span>
<a name="l00018"></a>00018 <span class="comment"> * This file is a little funky since it's compiled into both C and C++</span>
<a name="l00019"></a>00019 <span class="comment"> * (after being #included into sdnv-c.c).</span>
<a name="l00020"></a>00020 <span class="comment"> */</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="preprocessor">#ifdef HAVE_CONFIG_H</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor"># include <<a class="code" href="dtn-config_8h.html">dtn-config.h</a>></span>
<a name="l00024"></a>00024 <span class="preprocessor">#endif</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span>
<a name="l00026"></a>00026 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="SDNV_8h.html">SDNV.h</a>"</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include <oasys/debug/DebugUtils.h></span>
<a name="l00029"></a>00029 <span class="preprocessor">#include <oasys/debug/Log.h></span>
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="preprocessor">#define SDNV_FN(_what) SDNV::_what</span>
<a name="l00032"></a>00032 <span class="preprocessor"></span>
<a name="l00033"></a>00033 <span class="keyword">namespace </span>dtn {
<a name="l00034"></a>00034
<a name="l00035"></a>00035 <span class="preprocessor">#else // ! __cplusplus</span>
<a name="l00036"></a>00036 <span class="preprocessor"></span>
<a name="l00037"></a>00037 <span class="preprocessor">#include <stdio.h></span>
<a name="l00038"></a>00038 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00039"></a>00039 <span class="preprocessor">#include <oasys/compat/inttypes.h></span>
<a name="l00040"></a>00040
<a name="l00041"></a><a class="code" href="SDNV_8cc.html#4c245b9bdd3d61688430f4974958fcd4">00041</a> <span class="preprocessor">#define SDNV_FN(_what) sdnv_##_what</span>
<a name="l00042"></a>00042 <span class="preprocessor"></span>
<a name="l00043"></a>00043 <span class="comment">//----------------------------------------------------------------------</span>
<a name="l00044"></a><a class="code" href="SDNV_8cc.html#ca68c0d4ac8df0838e209fb5300f7be3">00044</a> <span class="preprocessor">#define ASSERT(x) \</span>
<a name="l00045"></a>00045 <span class="preprocessor">do { \</span>
<a name="l00046"></a>00046 <span class="preprocessor"> if (! (x)) { \</span>
<a name="l00047"></a>00047 <span class="preprocessor"> fprintf(stderr, "ASSERTION FAILED (" #x ") at %s:%d\n", \</span>
<a name="l00048"></a>00048 <span class="preprocessor"> __FILE__, __LINE__); \</span>
<a name="l00049"></a>00049 <span class="preprocessor"> exit(1); \</span>
<a name="l00050"></a>00050 <span class="preprocessor"> } \</span>
<a name="l00051"></a>00051 <span class="preprocessor">} while (0)</span>
<a name="l00052"></a>00052 <span class="preprocessor"></span>
<a name="l00053"></a>00053 <span class="comment">//----------------------------------------------------------------------</span>
<a name="l00054"></a><a class="code" href="SDNV_8cc.html#3f24cadc9f28aba33472df0500092dcb">00054</a> <span class="preprocessor">#define log_err_p(p, args...) fprintf(stderr, "error: (" p ") " args);</span>
<a name="l00055"></a>00055 <span class="preprocessor"></span>
<a name="l00056"></a><a class="code" href="SDNV_8cc.html#7a9a231e30b47bc0345749c8bd1e5077">00056</a> <span class="preprocessor">#define MAX_LENGTH 10</span>
<a name="l00057"></a>00057 <span class="preprocessor"></span>
<a name="l00058"></a>00058 <span class="preprocessor">#endif // __cplusplus</span>
<a name="l00059"></a>00059 <span class="preprocessor"></span>
<a name="l00060"></a>00060 <span class="comment">//----------------------------------------------------------------------</span>
<a name="l00061"></a>00061 <span class="keywordtype">int</span>
<a name="l00062"></a><a class="code" href="SDNV_8cc.html#21c54ef3a5345647ad1cada265a03eb4">00062</a> <a class="code" href="SDNV_8cc.html#4c245b9bdd3d61688430f4974958fcd4">SDNV_FN</a>(<a class="code" href="SDNV_8cc.html#21c54ef3a5345647ad1cada265a03eb4">encode</a>)(u_int64_t <a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a>, u_char* bp, <span class="keywordtype">size_t</span> <a class="code" href="num2sdnv_8c.html#fed088663f8704004425cdae2120b9b3">len</a>)
<a name="l00063"></a>00063 {
<a name="l00064"></a>00064 u_char* start = bp;
<a name="l00065"></a>00065
<a name="l00066"></a>00066 <span class="comment">/*</span>
<a name="l00067"></a>00067 <span class="comment"> * Figure out how many bytes we need for the encoding.</span>
<a name="l00068"></a>00068 <span class="comment"> */</span>
<a name="l00069"></a>00069 <span class="keywordtype">size_t</span> val_len = 0;
<a name="l00070"></a>00070 u_int64_t tmp = <a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a>;
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keywordflow">do</span> {
<a name="l00073"></a>00073 tmp = tmp >> 7;
<a name="l00074"></a>00074 val_len++;
<a name="l00075"></a>00075 } <span class="keywordflow">while</span> (tmp != 0);
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <a class="code" href="SDNV_8cc.html#ca68c0d4ac8df0838e209fb5300f7be3">ASSERT</a>(val_len > 0);
<a name="l00078"></a>00078 <a class="code" href="SDNV_8cc.html#ca68c0d4ac8df0838e209fb5300f7be3">ASSERT</a>(val_len <= <a class="code" href="SDNV_8cc.html#7a9a231e30b47bc0345749c8bd1e5077">MAX_LENGTH</a>);
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <span class="comment">/*</span>
<a name="l00081"></a>00081 <span class="comment"> * Make sure we have enough buffer space.</span>
<a name="l00082"></a>00082 <span class="comment"> */</span>
<a name="l00083"></a>00083 <span class="keywordflow">if</span> (<a class="code" href="num2sdnv_8c.html#fed088663f8704004425cdae2120b9b3">len</a> < val_len) {
<a name="l00084"></a>00084 <span class="keywordflow">return</span> -1;
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086
<a name="l00087"></a>00087 <span class="comment">/*</span>
<a name="l00088"></a>00088 <span class="comment"> * Now advance bp to the last byte and fill it in backwards with</span>
<a name="l00089"></a>00089 <span class="comment"> * the value bytes.</span>
<a name="l00090"></a>00090 <span class="comment"> */</span>
<a name="l00091"></a>00091 bp += val_len;
<a name="l00092"></a>00092 u_char high_bit = 0; <span class="comment">// for the last octet</span>
<a name="l00093"></a>00093 <span class="keywordflow">do</span> {
<a name="l00094"></a>00094 --bp;
<a name="l00095"></a>00095 *bp = (u_char)(high_bit | (<a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a> & 0x7f));
<a name="l00096"></a>00096 high_bit = (1 << 7); <span class="comment">// for all but the last octet</span>
<a name="l00097"></a>00097 <a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a> = <a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a> >> 7;
<a name="l00098"></a>00098 } <span class="keywordflow">while</span> (<a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a> != 0);
<a name="l00099"></a>00099
<a name="l00100"></a>00100 <a class="code" href="SDNV_8cc.html#ca68c0d4ac8df0838e209fb5300f7be3">ASSERT</a>(bp == start);
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="keywordflow">return</span> val_len;
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104
<a name="l00105"></a>00105 <span class="comment">//----------------------------------------------------------------------</span>
<a name="l00106"></a>00106 <span class="keywordtype">size_t</span>
<a name="l00107"></a><a class="code" href="SDNV_8cc.html#46f4c114c92230c80f6714318251b542">00107</a> <a class="code" href="SDNV_8cc.html#4c245b9bdd3d61688430f4974958fcd4">SDNV_FN</a>(<a class="code" href="SDNV_8cc.html#46f4c114c92230c80f6714318251b542">encoding_len</a>)(u_int64_t <a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a>)
<a name="l00108"></a>00108 {
<a name="l00109"></a>00109 u_char <a class="code" href="num2sdnv_8c.html#a81cdcc7ff6987bc85c073253e32715f">buf</a>[16];
<a name="l00110"></a>00110 <span class="keywordtype">int</span> ret = <a class="code" href="SDNV_8cc.html#4c245b9bdd3d61688430f4974958fcd4">SDNV_FN</a>(<a class="code" href="SDNV_8cc.html#21c54ef3a5345647ad1cada265a03eb4">encode</a>)(<a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a>, buf, <span class="keyword">sizeof</span>(buf));
<a name="l00111"></a>00111 <a class="code" href="SDNV_8cc.html#ca68c0d4ac8df0838e209fb5300f7be3">ASSERT</a>(ret != -1 && ret != 0);
<a name="l00112"></a>00112 <span class="keywordflow">return</span> ret;
<a name="l00113"></a>00113 }
<a name="l00114"></a>00114
<a name="l00115"></a>00115 <span class="comment">//----------------------------------------------------------------------</span>
<a name="l00116"></a>00116 <span class="keywordtype">int</span>
<a name="l00117"></a><a class="code" href="SDNV_8cc.html#151d178617a7c2f598cfd7630ebeb7b4">00117</a> <a class="code" href="SDNV_8cc.html#4c245b9bdd3d61688430f4974958fcd4">SDNV_FN</a>(<a class="code" href="SDNV_8cc.html#151d178617a7c2f598cfd7630ebeb7b4">decode</a>)(<span class="keyword">const</span> u_char* bp, <span class="keywordtype">size_t</span> <a class="code" href="num2sdnv_8c.html#fed088663f8704004425cdae2120b9b3">len</a>, u_int64_t* <a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a>)
<a name="l00118"></a>00118 {
<a name="l00119"></a>00119 <span class="keyword">const</span> u_char* start = bp;
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="keywordflow">if</span> (!<a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a>) {
<a name="l00122"></a>00122 <span class="keywordflow">return</span> -1;
<a name="l00123"></a>00123 }
<a name="l00124"></a>00124
<a name="l00125"></a>00125 <span class="comment">/*</span>
<a name="l00126"></a>00126 <span class="comment"> * Zero out the existing value, then shift in the bytes of the</span>
<a name="l00127"></a>00127 <span class="comment"> * encoding one by one until we hit a byte that has a zero</span>
<a name="l00128"></a>00128 <span class="comment"> * high-order bit.</span>
<a name="l00129"></a>00129 <span class="comment"> */</span>
<a name="l00130"></a>00130 <span class="keywordtype">size_t</span> val_len = 0;
<a name="l00131"></a>00131 *<a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a> = 0;
<a name="l00132"></a>00132 <span class="keywordflow">do</span> {
<a name="l00133"></a>00133 <span class="keywordflow">if</span> (<a class="code" href="num2sdnv_8c.html#fed088663f8704004425cdae2120b9b3">len</a> == 0)
<a name="l00134"></a>00134 <span class="keywordflow">return</span> -1; <span class="comment">// buffer too short</span>
<a name="l00135"></a>00135
<a name="l00136"></a>00136 *<a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a> = (*<a class="code" href="num2sdnv_8c.html#455b3605dc605fe8e055b9c1470535cf">val</a> << 7) | (*bp & 0x7f);
<a name="l00137"></a>00137 ++val_len;
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="keywordflow">if</span> ((*bp & (1 << 7)) == 0)
<a name="l00140"></a>00140 <span class="keywordflow">break</span>; <span class="comment">// all done;</span>
<a name="l00141"></a>00141
<a name="l00142"></a>00142 ++bp;
<a name="l00143"></a>00143 --<a class="code" href="num2sdnv_8c.html#fed088663f8704004425cdae2120b9b3">len</a>;
<a name="l00144"></a>00144 } <span class="keywordflow">while</span> (1);
<a name="l00145"></a>00145
<a name="l00146"></a>00146 <span class="comment">/*</span>
<a name="l00147"></a>00147 <span class="comment"> * Since the spec allows for infinite length values but this</span>
<a name="l00148"></a>00148 <span class="comment"> * implementation only handles up to 64 bits, check for overflow.</span>
<a name="l00149"></a>00149 <span class="comment"> * Note that the only supportable 10 byte SDNV must store exactly</span>
<a name="l00150"></a>00150 <span class="comment"> * one bit in the first byte of the encoding (i.e. the 64'th bit</span>
<a name="l00151"></a>00151 <span class="comment"> * of the original value).</span>
<a name="l00152"></a>00152 <span class="comment"> * This is OK because a spec update says that behavior</span>
<a name="l00153"></a>00153 <span class="comment"> * is undefined for values > 64 bits.</span>
<a name="l00154"></a>00154 <span class="comment"> */</span>
<a name="l00155"></a>00155 <span class="keywordflow">if</span> ((val_len > <a class="code" href="SDNV_8cc.html#7a9a231e30b47bc0345749c8bd1e5077">MAX_LENGTH</a>) ||
<a name="l00156"></a>00156 ((val_len == <a class="code" href="SDNV_8cc.html#7a9a231e30b47bc0345749c8bd1e5077">MAX_LENGTH</a>) && (*start != 0x81)))
<a name="l00157"></a>00157 {
<a name="l00158"></a>00158 <a class="code" href="SDNV_8cc.html#3f24cadc9f28aba33472df0500092dcb">log_err_p</a>(<span class="stringliteral">"/dtn/bundle/sdnv"</span>, <span class="stringliteral">"overflow value in sdnv!!!"</span>);
<a name="l00159"></a>00159 <span class="keywordflow">return</span> -1;
<a name="l00160"></a>00160 }
<a name="l00161"></a>00161
<a name="l00162"></a>00162 <span class="comment">// XXX/demmer shouldn't use -1 as indication of both too short of</span>
<a name="l00163"></a>00163 <span class="comment">// a buffer and of error due to overflow or malformed SDNV since</span>
<a name="l00164"></a>00164 <span class="comment">// callers just assume that they need more data to decode and</span>
<a name="l00165"></a>00165 <span class="comment">// don't really check for errors</span>
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="keywordflow">return</span> val_len;
<a name="l00168"></a>00168 }
<a name="l00169"></a>00169
<a name="l00170"></a>00170 <span class="comment">//----------------------------------------------------------------------</span>
<a name="l00171"></a>00171 <span class="keywordtype">size_t</span>
<a name="l00172"></a><a class="code" href="SDNV_8cc.html#225a8d3df1e717b6dfeb2a7d054bd323">00172</a> <a class="code" href="SDNV_8cc.html#4c245b9bdd3d61688430f4974958fcd4">SDNV_FN</a>(<a class="code" href="num2sdnv_8c.html#fed088663f8704004425cdae2120b9b3">len</a>)(<span class="keyword">const</span> u_char* bp)
<a name="l00173"></a>00173 {
<a name="l00174"></a>00174 <span class="keywordtype">size_t</span> val_len = 1;
<a name="l00175"></a>00175
<a name="l00176"></a>00176 <span class="keywordflow">for</span> ( ; *bp++ & 0x80; ++val_len )
<a name="l00177"></a>00177 ;
<a name="l00178"></a>00178 <span class="keywordflow">return</span> val_len;
<a name="l00179"></a>00179 }
<a name="l00180"></a>00180
<a name="l00181"></a>00181 <span class="preprocessor">#ifdef __cplusplus</span>
<a name="l00182"></a>00182 <span class="preprocessor"></span>} <span class="comment">// namespace dtn</span>
<a name="l00183"></a>00183 <span class="preprocessor">#endif</span>
<a name="l00184"></a>00184 <span class="preprocessor"></span>
</pre></div></div>
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