asn_8cpp-source.html

著名的密码库Crypto++的文档 C++语言的杰作。程序员必备。

<a name="l00334"></a>00334                         <span class="keywordflow">if</span> (!definiteLength)
<a name="l00335"></a>00335                         {
<a name="l00336"></a>00336                                 <span class="keywordflow">if</span> (!(m_id &amp; CONSTRUCTED))
<a name="l00337"></a>00337                                         BERDecodeError();
<a name="l00338"></a>00338                                 m_level++;
<a name="l00339"></a>00339                                 m_state = IDENTIFIER;
<a name="l00340"></a>00340                                 <span class="keywordflow">break</span>;
<a name="l00341"></a>00341                         }
<a name="l00342"></a>00342                         m_state = BODY;         <span class="comment">// fall through</span>
<a name="l00343"></a>00343                 }
<a name="l00344"></a>00344                 <span class="keywordflow">case</span> BODY:
<a name="l00345"></a>00345                         m_lengthRemaining -= m_queue.<a class="code" href="class_buffered_transformation.html#91c4526148274ae9cb68803bb2d2a2aa" title="move transferMax bytes of the buffered output to target as input">TransferTo</a>(CurrentTarget(), m_lengthRemaining);
<a name="l00346"></a>00346 
<a name="l00347"></a>00347                         <span class="keywordflow">if</span> (m_lengthRemaining == 0)
<a name="l00348"></a>00348                                 m_state = IDENTIFIER;
<a name="l00349"></a>00349                 }
<a name="l00350"></a>00350 
<a name="l00351"></a>00351                 <span class="keywordflow">if</span> (m_state == IDENTIFIER &amp;&amp; m_level == 0)
<a name="l00352"></a>00352                 {
<a name="l00353"></a>00353                         <span class="comment">// just finished processing a level 0 object</span>
<a name="l00354"></a>00354                         ++m_nCurrentObject;
<a name="l00355"></a>00355 
<a name="l00356"></a>00356                         <span class="keywordflow">if</span> (m_flags &amp; <a class="code" href="class_encoded_object_filter.html#79e83aa124d042a26fba07ca3ede9d083cc81ef4dcdc4e0fc8122acd230ece7b">PUT_MESSANGE_END_AFTER_EACH_OBJECT</a>)
<a name="l00357"></a>00357                                 <a class="code" href="class_filter.html#c8fc888888b2dad88bf64fc703044a93" title="returns the object immediately attached to this object or NULL for no attachment">AttachedTransformation</a>()-&gt;<a class="code" href="class_buffered_transformation.html#20ae0ef2e4ff338b43849e541e9b940f">MessageEnd</a>();
<a name="l00358"></a>00358 
<a name="l00359"></a>00359                         <span class="keywordflow">if</span> (m_nCurrentObject == m_nObjects)
<a name="l00360"></a>00360                         {
<a name="l00361"></a>00361                                 <span class="keywordflow">if</span> (m_flags &amp; <a class="code" href="class_encoded_object_filter.html#79e83aa124d042a26fba07ca3ede9d0850e27220e4156443726d4610a5caa716">PUT_MESSANGE_END_AFTER_ALL_OBJECTS</a>)
<a name="l00362"></a>00362                                         <a class="code" href="class_filter.html#c8fc888888b2dad88bf64fc703044a93" title="returns the object immediately attached to this object or NULL for no attachment">AttachedTransformation</a>()-&gt;<a class="code" href="class_buffered_transformation.html#20ae0ef2e4ff338b43849e541e9b940f">MessageEnd</a>();
<a name="l00363"></a>00363 
<a name="l00364"></a>00364                                 <span class="keywordflow">if</span> (m_flags &amp; <a class="code" href="class_encoded_object_filter.html#79e83aa124d042a26fba07ca3ede9d08c2d3a09df4cff483a6867d5056aa1264">PUT_MESSANGE_SERIES_END_AFTER_ALL_OBJECTS</a>)
<a name="l00365"></a>00365                                         <a class="code" href="class_filter.html#c8fc888888b2dad88bf64fc703044a93" title="returns the object immediately attached to this object or NULL for no attachment">AttachedTransformation</a>()-&gt;<a class="code" href="class_buffered_transformation.html#ae4c5ae024419e31bfa0c24eb35b24c2" title="mark end of a series of messages">MessageSeriesEnd</a>();
<a name="l00366"></a>00366 
<a name="l00367"></a>00367                                 m_queue.<a class="code" href="class_buffered_transformation.html#80b60bff9f62976c15effdbc45cbc5f1">TransferAllTo</a>(*<a class="code" href="class_filter.html#c8fc888888b2dad88bf64fc703044a93" title="returns the object immediately attached to this object or NULL for no attachment">AttachedTransformation</a>());
<a name="l00368"></a>00368                                 <span class="keywordflow">return</span>;
<a name="l00369"></a>00369                         }
<a name="l00370"></a>00370                 }
<a name="l00371"></a>00371         }
<a name="l00372"></a>00372 }
<a name="l00373"></a>00373 
<a name="l00374"></a><a class="code" href="class_b_e_r_general_decoder.html#4044a915e770a703520a2349730ace38">00374</a> <a class="code" href="class_b_e_r_general_decoder.html#4044a915e770a703520a2349730ace38">BERGeneralDecoder::BERGeneralDecoder</a>(<a class="code" href="class_buffered_transformation.html" title="interface for buffered transformations">BufferedTransformation</a> &amp;inQueue, byte asnTag)
<a name="l00375"></a>00375         : m_inQueue(inQueue), m_finished(false)
<a name="l00376"></a>00376 {
<a name="l00377"></a>00377         Init(asnTag);
<a name="l00378"></a>00378 }
<a name="l00379"></a>00379 
<a name="l00380"></a><a class="code" href="class_b_e_r_general_decoder.html#a95f58ca2fb775aa5f3f355e6bfb43ee">00380</a> <a class="code" href="class_b_e_r_general_decoder.html#4044a915e770a703520a2349730ace38">BERGeneralDecoder::BERGeneralDecoder</a>(<a class="code" href="class_b_e_r_general_decoder.html" title="BER General Decoder.">BERGeneralDecoder</a> &amp;inQueue, byte asnTag)
<a name="l00381"></a>00381         : <a class="code" href="class_b_e_r_general_decoder.html#29c44ea3a6c6cdf63c58046d8ab22266">m_inQueue</a>(inQueue), <a class="code" href="class_b_e_r_general_decoder.html#5eb4279b5ed2b47bc9811d4bff81b532">m_finished</a>(false)
<a name="l00382"></a>00382 {
<a name="l00383"></a>00383         Init(asnTag);
<a name="l00384"></a>00384 }
<a name="l00385"></a>00385 
<a name="l00386"></a>00386 <span class="keywordtype">void</span> BERGeneralDecoder::Init(byte asnTag)
<a name="l00387"></a>00387 {
<a name="l00388"></a>00388         byte b;
<a name="l00389"></a>00389         <span class="keywordflow">if</span> (!<a class="code" href="class_b_e_r_general_decoder.html#29c44ea3a6c6cdf63c58046d8ab22266">m_inQueue</a>.<a class="code" href="class_buffered_transformation.html#9e1ad913c8fe697d269f408a7d5928fc" title="try to retrieve a single byte">Get</a>(b) || b != asnTag)
<a name="l00390"></a>00390                 BERDecodeError();
<a name="l00391"></a>00391 
<a name="l00392"></a>00392         <span class="keywordflow">if</span> (!BERLengthDecode(<a class="code" href="class_b_e_r_general_decoder.html#29c44ea3a6c6cdf63c58046d8ab22266">m_inQueue</a>, <a class="code" href="class_b_e_r_general_decoder.html#11096d3b64df9f0b3ff3d8d74be9b3c3">m_length</a>, <a class="code" href="class_b_e_r_general_decoder.html#a9337ce30f65285a708bcb91b12524c8">m_definiteLength</a>))
<a name="l00393"></a>00393                 BERDecodeError();
<a name="l00394"></a>00394 
<a name="l00395"></a>00395         <span class="keywordflow">if</span> (!<a class="code" href="class_b_e_r_general_decoder.html#a9337ce30f65285a708bcb91b12524c8">m_definiteLength</a> &amp;&amp; !(asnTag &amp; CONSTRUCTED))
<a name="l00396"></a>00396                 BERDecodeError();       <span class="comment">// cannot be primitive and have indefinite length</span>
<a name="l00397"></a>00397 }
<a name="l00398"></a>00398 
<a name="l00399"></a><a class="code" href="class_b_e_r_general_decoder.html#8cebe14033da47fefc83396bfd463f4f">00399</a> <a class="code" href="class_b_e_r_general_decoder.html#8cebe14033da47fefc83396bfd463f4f">BERGeneralDecoder::~BERGeneralDecoder</a>()
<a name="l00400"></a>00400 {
<a name="l00401"></a>00401         <span class="keywordflow">try</span>     <span class="comment">// avoid throwing in constructor</span>
<a name="l00402"></a>00402         {
<a name="l00403"></a>00403                 <span class="keywordflow">if</span> (!<a class="code" href="class_b_e_r_general_decoder.html#5eb4279b5ed2b47bc9811d4bff81b532">m_finished</a>)
<a name="l00404"></a>00404                         <a class="code" href="class_b_e_r_general_decoder.html#40b14625c98ac7febb8ca218d02358ad">MessageEnd</a>();
<a name="l00405"></a>00405         }
<a name="l00406"></a>00406         <span class="keywordflow">catch</span> (...)
<a name="l00407"></a>00407         {
<a name="l00408"></a>00408         }
<a name="l00409"></a>00409 }
<a name="l00410"></a>00410 
<a name="l00411"></a><a class="code" href="class_b_e_r_general_decoder.html#04f4fe90e88584b1cebffd32e149bfbc">00411</a> <span class="keywordtype">bool</span> <a class="code" href="class_b_e_r_general_decoder.html#04f4fe90e88584b1cebffd32e149bfbc">BERGeneralDecoder::EndReached</a>()<span class="keyword"> const</span>
<a name="l00412"></a>00412 <span class="keyword"></span>{
<a name="l00413"></a>00413         <span class="keywordflow">if</span> (<a class="code" href="class_b_e_r_general_decoder.html#a9337ce30f65285a708bcb91b12524c8">m_definiteLength</a>)
<a name="l00414"></a>00414                 <span class="keywordflow">return</span> <a class="code" href="class_b_e_r_general_decoder.html#11096d3b64df9f0b3ff3d8d74be9b3c3">m_length</a> == 0;
<a name="l00415"></a>00415         <span class="keywordflow">else</span>
<a name="l00416"></a>00416         {       <span class="comment">// check end-of-content octets</span>
<a name="l00417"></a>00417                 word16 i;
<a name="l00418"></a>00418                 <span class="keywordflow">return</span> (<a class="code" href="class_b_e_r_general_decoder.html#29c44ea3a6c6cdf63c58046d8ab22266">m_inQueue</a>.<a class="code" href="class_buffered_transformation.html#452057f0d887ba0f2b6ec5373e290e91" title="try to peek at a 16-bit word">PeekWord16</a>(i)==2 &amp;&amp; i==0);
<a name="l00419"></a>00419         }
<a name="l00420"></a>00420 }
<a name="l00421"></a>00421 
<a name="l00422"></a><a class="code" href="class_b_e_r_general_decoder.html#9caeadfb99cf38c16c0aec9d50b6cdf5">00422</a> byte <a class="code" href="class_b_e_r_general_decoder.html#9caeadfb99cf38c16c0aec9d50b6cdf5">BERGeneralDecoder::PeekByte</a>()<span class="keyword"> const</span>
<a name="l00423"></a>00423 <span class="keyword"></span>{
<a name="l00424"></a>00424         byte b;
<a name="l00425"></a>00425         <span class="keywordflow">if</span> (!<a class="code" href="class_buffered_transformation.html#5fa048faf8c043ad57ae0a8911070090" title="peek at the next byte without removing it from the output buffer">Peek</a>(b))
<a name="l00426"></a>00426                 BERDecodeError();
<a name="l00427"></a>00427         <span class="keywordflow">return</span> b;
<a name="l00428"></a>00428 }
<a name="l00429"></a>00429 
<a name="l00430"></a><a class="code" href="class_b_e_r_general_decoder.html#f420c75709d4e5d8a5a1253ce458d882">00430</a> <span class="keywordtype">void</span> <a class="code" href="class_b_e_r_general_decoder.html#f420c75709d4e5d8a5a1253ce458d882">BERGeneralDecoder::CheckByte</a>(byte check)
<a name="l00431"></a>00431 {
<a name="l00432"></a>00432         byte b;
<a name="l00433"></a>00433         <span class="keywordflow">if</span> (!<a class="code" href="class_buffered_transformation.html#9e1ad913c8fe697d269f408a7d5928fc" title="try to retrieve a single byte">Get</a>(b) || b != check)
<a name="l00434"></a>00434                 BERDecodeError();
<a name="l00435"></a>00435 }
<a name="l00436"></a>00436 
<a name="l00437"></a><a class="code" href="class_b_e_r_general_decoder.html#40b14625c98ac7febb8ca218d02358ad">00437</a> <span class="keywordtype">void</span> <a class="code" href="class_b_e_r_general_decoder.html#40b14625c98ac7febb8ca218d02358ad">BERGeneralDecoder::MessageEnd</a>()
<a name="l00438"></a>00438 {
<a name="l00439"></a>00439         <a class="code" href="class_b_e_r_general_decoder.html#5eb4279b5ed2b47bc9811d4bff81b532">m_finished</a> = <span class="keyword">true</span>;
<a name="l00440"></a>00440         <span class="keywordflow">if</span> (<a class="code" href="class_b_e_r_general_decoder.html#a9337ce30f65285a708bcb91b12524c8">m_definiteLength</a>)
<a name="l00441"></a>00441         {
<a name="l00442"></a>00442                 <span class="keywordflow">if</span> (<a class="code" href="class_b_e_r_general_decoder.html#11096d3b64df9f0b3ff3d8d74be9b3c3">m_length</a> != 0)
<a name="l00443"></a>00443                         BERDecodeError();
<a name="l00444"></a>00444         }
<a name="l00445"></a>00445         <span class="keywordflow">else</span>
<a name="l00446"></a>00446         {       <span class="comment">// remove end-of-content octets</span>
<a name="l00447"></a>00447                 word16 i;
<a name="l00448"></a>00448                 <span class="keywordflow">if</span> (<a class="code" href="class_b_e_r_general_decoder.html#29c44ea3a6c6cdf63c58046d8ab22266">m_inQueue</a>.<a class="code" href="class_buffered_transformation.html#1ac50bcb2d279c3c6aef6858dab3eeb7" title="try to retrieve a 16-bit word">GetWord16</a>(i) != 2 || i != 0)
<a name="l00449"></a>00449                         BERDecodeError();
<a name="l00450"></a>00450         }
<a name="l00451"></a>00451 }