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<h1>FXStream.h</h1><div class="fragment"><pre>00001 <span class="comment">/********************************************************************************</span>
00002 <span class="comment">* *</span>
00003 <span class="comment">* P e r s i s t e n t S t o r a g e S t r e a m C l a s s e s *</span>
00004 <span class="comment">* *</span>
00005 <span class="comment">*********************************************************************************</span>
00006 <span class="comment">* Copyright (C) 1997,2004 by Jeroen van der Zijp. All Rights Reserved. *</span>
00007 <span class="comment">*********************************************************************************</span>
00008 <span class="comment">* This library is free software; you can redistribute it and/or *</span>
00009 <span class="comment">* modify it under the terms of the GNU Lesser General Public *</span>
00010 <span class="comment">* License as published by the Free Software Foundation; either *</span>
00011 <span class="comment">* version 2.1 of the License, or (at your option) any later version. *</span>
00012 <span class="comment">* *</span>
00013 <span class="comment">* This library is distributed in the hope that it will be useful, *</span>
00014 <span class="comment">* but WITHOUT ANY WARRANTY; without even the implied warranty of *</span>
00015 <span class="comment">* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *</span>
00016 <span class="comment">* Lesser General Public License for more details. *</span>
00017 <span class="comment">* *</span>
00018 <span class="comment">* You should have received a copy of the GNU Lesser General Public *</span>
00019 <span class="comment">* License along with this library; if not, write to the Free Software *</span>
00020 <span class="comment">* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. *</span>
00021 <span class="comment">*********************************************************************************</span>
00022 <span class="comment">* $Id: FXStream.h,v 1.29 2004/01/13 20:56:04 fox Exp $ *</span>
00023 <span class="comment">********************************************************************************/</span>
00024 <span class="preprocessor">#ifndef FXSTREAM_H</span>
00025 <span class="preprocessor"></span><span class="preprocessor">#define FXSTREAM_H</span>
00026 <span class="preprocessor"></span>
00027
00028 <span class="keyword">namespace </span>FX {
00029
00030 <span class="comment"></span>
00031 <span class="comment">/// Stream data flow direction</span>
00032 <span class="comment"></span><span class="keyword">enum</span> <a class="code" href="group__FXStream__0.html#a0">FXStreamDirection</a> {
00033 <a class="code" href="group__FXStream__0.html#a0a2017">FXStreamDead</a>=0, <span class="comment">/// Unopened stream</span>
00034 <span class="comment"></span> <a class="code" href="group__FXStream__0.html#a0a2018">FXStreamSave</a>=1, <span class="comment">/// Saving stuff to stream</span>
<a name="l00035"></a><a class="code" href="group__FXStream__0.html#a0">00035</a> <span class="comment"></span> <a class="code" href="group__FXStream__0.html#a0a2019">FXStreamLoad</a>=2 <span class="comment">/// Loading stuff from stream</span>
00036 <span class="comment"></span> };
00037
00038 <span class="comment"></span>
00039 <span class="comment">/// Stream status codes</span>
00040 <span class="comment"></span><span class="keyword">enum</span> <a class="code" href="group__FXStream__1.html#a0">FXStreamStatus</a> {
00041 <a class="code" href="group__FXStream__1.html#a0a2020">FXStreamOK</a>=0, <span class="comment">/// OK</span>
00042 <span class="comment"></span> <a class="code" href="group__FXStream__1.html#a0a2021">FXStreamEnd</a>=1, <span class="comment">/// Try read past end of stream</span>
00043 <span class="comment"></span> <a class="code" href="group__FXStream__1.html#a0a2022">FXStreamFull</a>=2, <span class="comment">/// Filled up stream buffer or disk full</span>
00044 <span class="comment"></span> <a class="code" href="group__FXStream__1.html#a0a2023">FXStreamNoWrite</a>=3, <span class="comment">/// Unable to open for write</span>
00045 <span class="comment"></span> <a class="code" href="group__FXStream__1.html#a0a2024">FXStreamNoRead</a>=4, <span class="comment">/// Unable to open for read</span>
00046 <span class="comment"></span> <a class="code" href="group__FXStream__1.html#a0a2025">FXStreamFormat</a>=5, <span class="comment">/// Stream format error</span>
<a name="l00047"></a><a class="code" href="group__FXStream__1.html#a0">00047</a> <span class="comment"></span> <a class="code" href="group__FXStream__1.html#a0a2026">FXStreamUnknown</a>=6, <span class="comment">/// Trying to read unknown class</span>
00048 <span class="comment"></span> <a class="code" href="group__FXStream__1.html#a0a2027">FXStreamAlloc</a>=7, <span class="comment">/// Alloc failed</span>
00049 <span class="comment"></span> <a class="code" href="group__FXStream__1.html#a0a2028">FXStreamFailure</a>=8 <span class="comment">/// General failure</span>
00050 <span class="comment"></span> };
00051
00052 <span class="comment"></span>
00053 <span class="comment">/// Stream seeking</span>
00054 <span class="comment"></span><span class="keyword">enum</span> <a class="code" href="group__FXStream__2.html#a0">FXWhence</a> {
00055 <a class="code" href="group__FXStream__2.html#a0a2029">FXFromStart</a>=0, <span class="comment">/// Seek from start position</span>
00056 <span class="comment"></span> <a class="code" href="group__FXStream__2.html#a0a2030">FXFromCurrent</a>=1, <span class="comment">/// Seek from current position</span>
00057 <span class="comment"></span> <a class="code" href="group__FXStream__2.html#a0a2031">FXFromEnd</a>=2 <span class="comment">/// Seek from end position</span>
00058 <span class="comment"></span> };
00059
00060 <span class="comment"></span>
00061 <span class="comment">/**</span>
00062 <span class="comment">* A stream is a way to serialize data and objects into a byte stream.</span>
00063 <span class="comment">* Each item of data that is saved or loaded from the stream may be byte-swapped,</span>
00064 <span class="comment">* thus allowing little-endian machines to read data produced on big endian ones</span>
<a name="l00065"></a><a class="code" href="group__FXStream__2.html#a0">00065</a> <span class="comment">* and vice-versa.</span>
00066 <span class="comment">* Data is serialized exactly as-is. There are no tags or other markers</span>
00067 <span class="comment">* inserted into the stream; thus, the stream may be used to save or load arbitrary</span>
00068 <span class="comment">* binary data.</span>
00069 <span class="comment">* Objects derived from FXObjects may be serialized also; whenever a reference to an</span>
00070 <span class="comment">* object is serialized, a table is consulted to determine if the same object has</span>
00071 <span class="comment">* been encountered previously; if not, the object is added to the table and then</span>
00072 <span class="comment">* its contents are serialized. If the object has been encountered before, only a</span>
00073 <span class="comment">* reference to the object is serialized.</span>
00074 <span class="comment">* When loading back a serialized object, new instances are constructed using</span>
00075 <span class="comment">* the default constructor, and subsequently the object's contents are loaded.</span>
00076 <span class="comment">* A special container object may be passed in which is placed in the table</span>
00077 <span class="comment">* as if it had been encountered before; this will cause only references to this</span>
00078 <span class="comment">* object to be saved. The container object is typically the top-level document</span>
00079 <span class="comment">* object which manages all objects contained by it.</span>
00080 <span class="comment">*/</span>
00081 <span class="keyword">class </span>FXAPI FXStream {
00082 <span class="keyword">private</span>:
00083 <span class="keyword">struct </span>FXStreamHashEntry {
00084 FXuint ref; <span class="comment">// Object reference number</span>
00085 FXObject* obj; <span class="comment">// Pointer to object</span>
00086 };
00087 <span class="keyword">private</span>:
00088 <span class="keyword">const</span> FXObject* parent; <span class="comment">// Parent object</span>
00089 FXStreamHashEntry* table; <span class="comment">// Hash table</span>
00090 FXuint ntable; <span class="comment">// Table size</span>
00091 FXuint no; <span class="comment">// Count objects</span>
00092 FXbool swap; <span class="comment">// Swap bytes on readin</span>
00093 <span class="keywordtype">void</span> grow(); <span class="comment">// Enlarge the table</span>
00094 <span class="keyword">protected</span>:
00095 FXuchar *begptr; <span class="comment">// Begin of buffer</span>
00096 FXuchar *endptr; <span class="comment">// End of buffer</span>
00097 FXuchar *wrptr; <span class="comment">// Write pointer</span>
<a name="l00098"></a><a class="code" href="classFX_1_1FXStream.html">00098</a> FXuchar *rdptr; <span class="comment">// Read pointer</span>
00099 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> pos; <span class="comment">// Position</span>
00100 <a class="code" href="group__FXStream__0.html#a0">FXStreamDirection</a> dir; <span class="comment">// Direction of current transfer</span>
00101 <a class="code" href="group__FXStream__1.html#a0">FXStreamStatus</a> code; <span class="comment">// Status code</span>
00102 FXbool owns; <span class="comment">// Stream owns buffer</span>
00103 <span class="keyword">protected</span>:
00104 <span class="comment"></span>
00105 <span class="comment"> /**</span>
00106 <span class="comment"> * Write at least count bytes from the buffer;</span>
00107 <span class="comment"> * returns number of bytes available to be written.</span>
00108 <span class="comment"> */</span>
00109 <span class="keyword">virtual</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> writeBuffer(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> count);
00110 <span class="comment"></span>
00111 <span class="comment"> /**</span>
00112 <span class="comment"> * Read at least count bytes into the buffer;</span>
00113 <span class="comment"> * returns number of bytes available to be read.</span>
00114 <span class="comment"> */</span>
00115 <span class="keyword">virtual</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> readBuffer(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> count);
00116
00117 <span class="keyword">public</span>:
00118 <span class="comment"></span>
00119 <span class="comment"> /**</span>
00120 <span class="comment"> * Construct stream with given container object. The container object</span>
00121 <span class="comment"> * is an object that will itself not be saved to or loaded from the stream,</span>
00122 <span class="comment"> * but which may be referenced by other objects. These references will be</span>
00123 <span class="comment"> * properly saved and restored.</span>
00124 <span class="comment"> */</span>
00125 FXStream(<span class="keyword">const</span> <a class="code" href="classFX_1_1FXObject.html">FXObject</a>* cont=NULL);
00126 <span class="comment"></span>
00127 <span class="comment"> /**</span>
00128 <span class="comment"> * Open stream for reading (FXStreamLoad) or for writing (FXStreamSave).</span>
00129 <span class="comment"> * An initial buffer size may be given, which must be at least 16 bytes.</span>
<a name="l00130"></a><a class="code" href="classFX_1_1FXStream.html#a6">00130</a> <span class="comment"> * If data is not NULL, it is expected to point to an external data buffer</span>
00131 <span class="comment"> * of length size; otherwise stream will use an internally managed buffer.</span>
00132 <span class="comment"> */</span>
<a name="l00133"></a><a class="code" href="classFX_1_1FXStream.html#a7">00133</a> FXbool open(FXStreamDirection save_or_load,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> size=8192,FXuchar* data=NULL);
00134 <span class="comment"></span>
00135 <span class="comment"> /// Close; return TRUE if OK</span>
00136 <span class="comment"></span> <span class="keyword">virtual</span> FXbool close();
00137 <span class="comment"></span>
00138 <span class="comment"> /// Flush buffer</span>
<a name="l00139"></a><a class="code" href="classFX_1_1FXStream.html#a9">00139</a> <span class="comment"></span> <span class="keyword">virtual</span> FXbool flush();
00140 <span class="comment"></span>
00141 <span class="comment"> /// Get available buffer space</span>
<a name="l00142"></a><a class="code" href="classFX_1_1FXStream.html#a10">00142</a> <span class="comment"></span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> getSpace() <span class="keyword">const</span>;
00143 <span class="comment"></span>
00144 <span class="comment"> /// Set available buffer space</span>
<a name="l00145"></a><a class="code" href="classFX_1_1FXStream.html#a11">00145</a> <span class="comment"></span> <span class="keywordtype">void</span> setSpace(<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> sp);
00146 <span class="comment"></span>
00147 <span class="comment"> /// Get status code</span>
00148 <span class="comment"></span> <a class="code" href="group__FXStream__1.html#a0">FXStreamStatus</a> status()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> code; }
00149 <span class="comment"></span>
00150 <span class="comment"> /// Return TRUE if at end of file or error</span>
00151 <span class="comment"></span> FXbool eof()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> code!=<a class="code" href="group__FXStream__1.html#a0a2020">FXStreamOK</a>; }
00152 <span class="comment"></span>
<a name="l00153"></a><a class="code" href="classFX_1_1FXStream.html#a13">00153</a> <span class="comment"> /// Set status code</span>
00154 <span class="comment"></span> <span class="keywordtype">void</span> setError(FXStreamStatus err);
00155 <span class="comment"></span>
00156 <span class="comment"> /// Obtain stream direction</span>
00157 <span class="comment"></span> <a class="code" href="group__FXStream__0.html#a0">FXStreamDirection</a> direction()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> dir; }
<a name="l00158"></a><a class="code" href="classFX_1_1FXStream.html#a14">00158</a> <span class="comment"></span>
00159 <span class="comment"> /// Get parent object</span>
00160 <span class="comment"></span> <span class="keyword">const</span> <a class="code" href="classFX_1_1FXObject.html">FXObject</a>* container()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> parent; }
<a name="l00161"></a><a class="code" href="classFX_1_1FXStream.html#e0">00161</a> <span class="comment"></span>
00162 <span class="comment"> /// Get position</span>
00163 <span class="comment"></span> <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> position()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> pos; }
00164 <span class="comment"></span>
00165 <span class="comment"> /// Move to position relative to head, tail, or current location</span>
00166 <span class="comment"></span> <span class="keyword">virtual</span> FXbool position(<span class="keywordtype">long</span> offset,FXWhence whence=FXFromStart);
00167 <span class="comment"></span>
00168 <span class="comment"> /**</span>
00169 <span class="comment"> * Change swap bytes flag.</span>
00170 <span class="comment"> */</span>
00171 <span class="keywordtype">void</span> swapBytes(FXbool s){ swap=s; }
00172 <span class="comment"></span>
00173 <span class="comment"> /**</span>
00174 <span class="comment"> * Get state of the swap bytes flag.</span>
00175 <span class="comment"> */</span>
00176 FXbool swapBytes()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> swap; }
00177 <span class="comment"></span>
00178 <span class="comment"> /// Return implementation's endianness</span>
00179 <span class="comment"></span> <span class="keyword">static</span> FXbool isLittleEndian(){ <span class="keywordflow">return</span> !FOX_BIGENDIAN; }
00180 <span class="comment"></span>
00181 <span class="comment"> /// Save single items to stream</span>
00182 <span class="comment"></span> FXStream& operator<<(<span class="keyword">const</span> FXuchar& v);
00183 FXStream& operator<<(<span class="keyword">const</span> FXchar& v){ <span class="keywordflow">return</span> *this << reinterpret_cast<const FXuchar&>(v); }
00184 FXStream& operator<<(<span class="keyword">const</span> FXushort& v);
00185 FXStream& operator<<(<span class="keyword">const</span> FXshort& v){ <span class="keywordflow">return</span> *this << reinterpret_cast<const FXushort&>(v); }
00186 FXStream& operator<<(<span class="keyword">const</span> FXuint& v);
00187 FXStream& operator<<(<span class="keyword">const</span> FXint& v){ <span class="keywordflow">return</span> *this << reinterpret_cast<const FXuint&>(v); }
00188 FXStream& operator<<(<span class="keyword">const</span> FXfloat& v){ <span class="keywordflow">return</span> *this << reinterpret_cast<const FXuint&>(v); }
00189 FXStream& operator<<(<span class="keyword">const</span> FXdouble& v);
00190 <span class="preprocessor">#ifdef FX_LONG</span>
00191 <span class="preprocessor"></span> FXStream& operator<<(<span class="keyword">const</span> FXlong& v){ <span class="keywordflow">return</span> *this << reinterpret_cast<const FXdouble&>(v); }
00192 FXStream& operator<<(<span class="keyword">const</span> FXulong& v){ <span class="keywordflow">return</span> *this << reinterpret_cast<const FXdouble&>(v); }
00193 <span class="preprocessor">#endif</span>
00194 <span class="preprocessor"></span><span class="comment"></span>
00195 <span class="comment"> /// Save arrays of items to stream</span>
00196 <span class="comment"></span> FXStream& save(<span class="keyword">const</span> FXuchar* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n);
00197 FXStream& save(<span class="keyword">const</span> FXchar* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> save(reinterpret_cast<const FXuchar*>(p),n); }
00198 FXStream& save(<span class="keyword">const</span> FXushort* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n);
00199 FXStream& save(<span class="keyword">const</span> FXshort* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> save(reinterpret_cast<const FXushort*>(p),n); }
00200 FXStream& save(<span class="keyword">const</span> FXuint* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n);
00201 FXStream& save(<span class="keyword">const</span> FXint* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> save(reinterpret_cast<const FXuint*>(p),n); }
00202 FXStream& save(<span class="keyword">const</span> FXfloat* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> save(reinterpret_cast<const FXuint*>(p),n); }
00203 FXStream& save(<span class="keyword">const</span> FXdouble* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n);
00204 <span class="preprocessor">#ifdef FX_LONG</span>
00205 <span class="preprocessor"></span> FXStream& save(<span class="keyword">const</span> FXlong* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> save(reinterpret_cast<const FXdouble*>(p),n); }
00206 FXStream& save(<span class="keyword">const</span> FXulong* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> save(reinterpret_cast<const FXdouble*>(p),n); }
00207 <span class="preprocessor">#endif</span>
00208 <span class="preprocessor"></span><span class="comment"></span>
00209 <span class="comment"> /// Load single items from stream</span>
00210 <span class="comment"></span> FXStream& operator>>(FXuchar& v);
00211 FXStream& operator>>(FXchar& v){ <span class="keywordflow">return</span> *<span class="keyword">this</span> >> reinterpret_cast<FXuchar&>(v); }
00212 FXStream& operator>>(FXushort& v);
00213 FXStream& operator>>(FXshort& v){ <span class="keywordflow">return</span> *<span class="keyword">this</span> >> reinterpret_cast<FXushort&>(v); }
00214 FXStream& operator>>(FXuint& v);
00215 FXStream& operator>>(FXint& v){ <span class="keywordflow">return</span> *<span class="keyword">this</span> >> reinterpret_cast<FXuint&>(v); }
00216 FXStream& operator>>(FXfloat& v){ <span class="keywordflow">return</span> *<span class="keyword">this</span> >> reinterpret_cast<FXuint&>(v); }
00217 FXStream& operator>>(FXdouble& v);
00218 <span class="preprocessor">#ifdef FX_LONG</span>
00219 <span class="preprocessor"></span> FXStream& operator>>(FXlong& v){ <span class="keywordflow">return</span> *<span class="keyword">this</span> >> reinterpret_cast<FXdouble&>(v); }
00220 FXStream& operator>>(FXulong& v){ <span class="keywordflow">return</span> *<span class="keyword">this</span> >> reinterpret_cast<FXdouble&>(v); }
00221 <span class="preprocessor">#endif</span>
00222 <span class="preprocessor"></span><span class="comment"></span>
00223 <span class="comment"> /// Load arrays of items from stream</span>
00224 <span class="comment"></span> FXStream& load(FXuchar* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n);
00225 FXStream& load(FXchar* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> load(reinterpret_cast<FXuchar*>(p),n); }
00226 FXStream& load(FXushort* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n);
00227 FXStream& load(FXshort* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> load(reinterpret_cast<FXushort*>(p),n); }
00228 FXStream& load(FXuint* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n);
00229 FXStream& load(FXint* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> load(reinterpret_cast<FXuint*>(p),n); }
00230 FXStream& load(FXfloat* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> load(reinterpret_cast<FXuint*>(p),n); }
00231 FXStream& load(FXdouble* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n);
00232 <span class="preprocessor">#ifdef FX_LONG</span>
00233 <span class="preprocessor"></span> FXStream& load(FXlong* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> load(reinterpret_cast<FXdouble*>(p),n); }
00234 FXStream& load(FXulong* p,<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> n){ <span class="keywordflow">return</span> load(reinterpret_cast<FXdouble*>(p),n); }
00235 <span class="preprocessor">#endif</span>
00236 <span class="preprocessor"></span><span class="comment"></span>
00237 <span class="comment"> /// Save object</span>
00238 <span class="comment"></span> FXStream& saveObject(<span class="keyword">const</span> FXObject* v);
00239 <span class="comment"></span>
00240 <span class="comment"> /// Load object</span>
00241 <span class="comment"></span> FXStream& loadObject(FXObject*& v);
00242 <span class="comment"></span>
00243 <span class="comment"> /// Destructor</span>
00244 <span class="comment"></span> <span class="keyword">virtual</span> ~FXStream();
00245 };
00246
00247 }
00248
00249 <span class="preprocessor">#endif</span>
</pre></div></font>
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