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<h1>/home/v/Kate/WORK_TREES/kate-sorceress-backup/v/src/kate/src/kate_fp.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Copyright (C) 2008, 2009 Vincent Penquerc'h.</span>
<a name="l00002"></a>00002 <span class="comment"> This file is part of the Kate codec library.</span>
<a name="l00003"></a>00003 <span class="comment"> Written by Vincent Penquerc'h.</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment"> Use, distribution and reproduction of this library is governed</span>
<a name="l00006"></a>00006 <span class="comment"> by a BSD style source license included with this source in the</span>
<a name="l00007"></a>00007 <span class="comment"> file 'COPYING'. Please read these terms before distributing. */</span>
<a name="l00008"></a>00008
<a name="l00009"></a>00009
<a name="l00010"></a>00010 <span class="preprocessor">#define KATE_INTERNAL</span>
<a name="l00011"></a>00011 <span class="preprocessor"></span><span class="preprocessor">#include "kate_internal.h"</span>
<a name="l00012"></a>00012
<a name="l00013"></a>00013 <span class="preprocessor">#ifdef HAVE_STDLIB_H</span>
<a name="l00014"></a>00014 <span class="preprocessor"></span><span class="preprocessor">#include <stdlib.h></span>
<a name="l00015"></a>00015 <span class="preprocessor">#endif</span>
<a name="l00016"></a>00016 <span class="preprocessor"></span><span class="preprocessor">#include "kate/kate.h"</span>
<a name="l00017"></a>00017 <span class="preprocessor">#include "kate_bitwise.h"</span>
<a name="l00018"></a>00018 <span class="preprocessor">#include "kate_fp.h"</span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="preprocessor">#define MERGE_STREAMS</span>
<a name="l00021"></a>00021 <span class="preprocessor"></span><span class="preprocessor">#define MERGE_STREAMS_COUNT_THRESHOLD 0</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span><span class="comment">/* #define WRITE_64_IN_TWO_32 */</span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="preprocessor">#define FLOAT_SCALE ((kate_float)(((kate_fp)1)<<(KATE_FP_FRAC)))</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span><span class="preprocessor">#define kate_fp_bits (sizeof(kate_fp)*8)</span>
<a name="l00026"></a>00026 <span class="preprocessor"></span><span class="preprocessor">#define kate_fp_cut_bits ((kate_fp_bits)/2-1)</span>
<a name="l00027"></a>00027 <span class="preprocessor"></span><span class="preprocessor">#define kate_fp_cut_bits_bits (kate_fp_bits==16?3:kate_fp_bits==32?4:kate_fp_bits==64?5:8)</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span><span class="preprocessor">#define kate_fp_sign_bit (kate_fp_bits==16?0x8000:kate_fp_bits==32?0x80000000:kate_fp_bits==64?((kate_int64_t)-1):0)</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span>
<a name="l00030"></a>00030 <span class="keyword">static</span> <span class="keyword">inline</span> kate_fp f2kfp(kate_float f)
<a name="l00031"></a>00031 {
<a name="l00032"></a>00032 kate_fp test=(kate_fp)(f*(FLOAT_SCALE*2));
<a name="l00033"></a>00033 <span class="keywordflow">if</span> (test&1)
<a name="l00034"></a>00034 <span class="keywordflow">return</span> (kate_fp)(f*FLOAT_SCALE+(kate_float)0.5);
<a name="l00035"></a>00035 <span class="keywordflow">else</span>
<a name="l00036"></a>00036 <span class="keywordflow">return</span> (kate_fp)(f*FLOAT_SCALE);
<a name="l00037"></a>00037 }
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="keyword">static</span> <span class="keyword">inline</span> kate_float kfp2f(kate_fp v)
<a name="l00040"></a>00040 {
<a name="l00041"></a>00041 <span class="keywordflow">return</span> v/FLOAT_SCALE;
<a name="l00042"></a>00042 }
<a name="l00043"></a>00043
<a name="l00044"></a>00044 <span class="keyword">static</span> <span class="keywordtype">int</span> kate_fp_scan(<span class="keywordtype">size_t</span> count,<span class="keyword">const</span> kate_fp *values,<span class="keywordtype">size_t</span> streams,<span class="keywordtype">int</span> *head,<span class="keywordtype">int</span> *tail)
<a name="l00045"></a>00045 {
<a name="l00046"></a>00046 kate_fp v=0,tst;
<a name="l00047"></a>00047 <span class="keywordtype">size_t</span> n;
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <span class="keywordflow">if</span> (!values || !head || !tail) <span class="keywordflow">return</span> KATE_E_INVALID_PARAMETER;
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="keywordflow">while</span> (count--) {
<a name="l00052"></a>00052 kate_fp value=*values;
<a name="l00053"></a>00053 values+=streams;
<a name="l00054"></a>00054 <span class="keywordflow">if</span> (value<0) value=-value;
<a name="l00055"></a>00055 v|=value;
<a name="l00056"></a>00056 }
<a name="l00057"></a>00057
<a name="l00058"></a>00058 tst=v;
<a name="l00059"></a>00059 <span class="keywordflow">for</span> (n=0;n<kate_fp_cut_bits;++n) {
<a name="l00060"></a>00060 <span class="keywordflow">if</span> (tst&kate_fp_sign_bit) <span class="keywordflow">break</span>;
<a name="l00061"></a>00061 tst<<=1;
<a name="l00062"></a>00062 }
<a name="l00063"></a>00063 *head=n;
<a name="l00064"></a>00064
<a name="l00065"></a>00065 tst=v;
<a name="l00066"></a>00066 <span class="keywordflow">for</span> (n=0;n<kate_fp_cut_bits;++n) {
<a name="l00067"></a>00067 <span class="keywordflow">if</span> (tst&1) <span class="keywordflow">break</span>;
<a name="l00068"></a>00068 tst>>=1;
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070 *tail=n;
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keywordflow">return</span> 0;
<a name="l00073"></a>00073 }
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="preprocessor">#if 0</span>
<a name="l00076"></a>00076 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">int</span> kate_fp_scan_constant(<span class="keywordtype">size_t</span> count,<span class="keyword">const</span> kate_fp *values,<span class="keywordtype">size_t</span> streams,kate_fp constant)
<a name="l00077"></a>00077 {
<a name="l00078"></a>00078 <span class="keywordflow">while</span> (count--) {
<a name="l00079"></a>00079 kate_fp value=*values;
<a name="l00080"></a>00080 values+=streams;
<a name="l00081"></a>00081 <span class="keywordflow">if</span> (value!=constant) <span class="keywordflow">return</span> 1;
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083 <span class="keywordflow">return</span> 0;
<a name="l00084"></a>00084 }
<a name="l00085"></a>00085 <span class="preprocessor">#endif</span>
<a name="l00086"></a>00086 <span class="preprocessor"></span>
<a name="l00087"></a>00087 <span class="comment">/* need 8 bits, then a bit for sign and kate_fp_bits-(t+h) per value */</span>
<a name="l00088"></a>00088 <span class="keywordtype">int</span> kate_fp_encode(<span class="keywordtype">size_t</span> count,<span class="keyword">const</span> kate_fp *values,<span class="keywordtype">size_t</span> streams,kate_pack_buffer *kpb)
<a name="l00089"></a>00089 {
<a name="l00090"></a>00090 <span class="keywordtype">int</span> head,tail;
<a name="l00091"></a>00091 <span class="keywordtype">int</span> bits;
<a name="l00092"></a>00092
<a name="l00093"></a>00093 <span class="keywordflow">if</span> (!kpb || count==0 || !values) <span class="keywordflow">return</span> KATE_E_INVALID_PARAMETER;
<a name="l00094"></a>00094
<a name="l00095"></a>00095 kate_fp_scan(count,values,streams,&head,&tail);
<a name="l00096"></a>00096 kate_pack_write(kpb,head,kate_fp_cut_bits_bits); <span class="comment">/* can be between 0 and kate_fp_cut_bits */</span>
<a name="l00097"></a>00097 kate_pack_write(kpb,tail,kate_fp_cut_bits_bits); <span class="comment">/* can be between 0 and kate_fp_cut_bits */</span>
<a name="l00098"></a>00098 bits=kate_fp_bits-tail-head;
<a name="l00099"></a>00099 <span class="keywordflow">while</span> (count--) {
<a name="l00100"></a>00100 kate_fp v=*values++;
<a name="l00101"></a>00101 <span class="keywordflow">if</span> (head>0) {
<a name="l00102"></a>00102 <span class="keywordflow">if</span> (v<0) {
<a name="l00103"></a>00103 kate_pack_write(kpb,1,1);
<a name="l00104"></a>00104 v=-v;
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106 <span class="keywordflow">else</span> {
<a name="l00107"></a>00107 kate_pack_write(kpb,0,1);
<a name="l00108"></a>00108 }
<a name="l00109"></a>00109 }
<a name="l00110"></a>00110 v>>=tail;
<a name="l00111"></a>00111 <span class="preprocessor">#ifdef WRITE_64_IN_TWO_32</span>
<a name="l00112"></a>00112 <span class="preprocessor"></span> <span class="keywordflow">if</span> (bits>32) {
<a name="l00113"></a>00113 kate_pack_write(kpb,v,32);
<a name="l00114"></a>00114 v>>=32;
<a name="l00115"></a>00115 kate_pack_write(kpb,v,bits-32); <span class="comment">/* will autoclip the head */</span>
<a name="l00116"></a>00116 }
<a name="l00117"></a>00117 <span class="keywordflow">else</span>
<a name="l00118"></a>00118 <span class="preprocessor">#endif</span>
<a name="l00119"></a>00119 <span class="preprocessor"></span> {
<a name="l00120"></a>00120 kate_pack_write(kpb,v,bits); <span class="comment">/* will autoclip the head */</span>
<a name="l00121"></a>00121 }
<a name="l00122"></a>00122 }
<a name="l00123"></a>00123
<a name="l00124"></a>00124 <span class="keywordflow">return</span> 0;
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="keywordtype">int</span> kate_fp_encode_kate_float(<span class="keywordtype">size_t</span> count,<span class="keyword">const</span> kate_float *values,<span class="keywordtype">size_t</span> streams,kate_pack_buffer *kpb)
<a name="l00128"></a>00128 {
<a name="l00129"></a>00129 kate_fp *fp_values;
<a name="l00130"></a>00130 <span class="keywordtype">size_t</span> s,n;
<a name="l00131"></a>00131 <span class="keywordtype">int</span> ret;
<a name="l00132"></a>00132
<a name="l00133"></a>00133 <span class="keywordflow">if</span> (count*streams==0) <span class="keywordflow">return</span> 0;
<a name="l00134"></a>00134
<a name="l00135"></a>00135 <span class="keywordflow">if</span> (streams>1 && count>MERGE_STREAMS_COUNT_THRESHOLD) {
<a name="l00136"></a>00136 <span class="preprocessor">#ifdef MERGE_STREAMS</span>
<a name="l00137"></a>00137 <span class="preprocessor"></span> count*=streams;
<a name="l00138"></a>00138 streams=1;
<a name="l00139"></a>00139 kate_pack_write(kpb,1,1);
<a name="l00140"></a>00140 <span class="preprocessor">#else</span>
<a name="l00141"></a>00141 <span class="preprocessor"></span> kate_pack_write(kpb,0,1);
<a name="l00142"></a>00142 <span class="preprocessor">#endif</span>
<a name="l00143"></a>00143 <span class="preprocessor"></span> }
<a name="l00144"></a>00144
<a name="l00145"></a>00145 fp_values=(kate_fp*)kate_checked_malloc(count,<span class="keyword">sizeof</span>(kate_fp));
<a name="l00146"></a>00146 <span class="keywordflow">if</span> (!fp_values) <span class="keywordflow">return</span> KATE_E_OUT_OF_MEMORY;
<a name="l00147"></a>00147
<a name="l00148"></a>00148 <span class="keywordflow">for</span> (s=0;s<streams;++s) {
<a name="l00149"></a>00149 <span class="keywordflow">for</span> (n=0;n<count;++n) {
<a name="l00150"></a>00150 kate_float v=values[n*streams+s];
<a name="l00151"></a>00151 fp_values[n]=f2kfp(v);
<a name="l00152"></a>00152 }
<a name="l00153"></a>00153
<a name="l00154"></a>00154 ret=kate_fp_encode(count,fp_values,1,kpb);
<a name="l00155"></a>00155 <span class="keywordflow">if</span> (ret<0) {
<a name="l00156"></a>00156 kate_free(fp_values);
<a name="l00157"></a>00157 <span class="keywordflow">return</span> ret;
<a name="l00158"></a>00158 }
<a name="l00159"></a>00159 }
<a name="l00160"></a>00160
<a name="l00161"></a>00161 kate_free(fp_values);
<a name="l00162"></a>00162
<a name="l00163"></a>00163 <span class="keywordflow">return</span> 0;
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165
<a name="l00166"></a>00166 <span class="keywordtype">int</span> kate_fp_decode(<span class="keywordtype">size_t</span> count,kate_fp *values,<span class="keywordtype">size_t</span> streams,kate_pack_buffer *kpb)
<a name="l00167"></a>00167 {
<a name="l00168"></a>00168 <span class="keywordtype">int</span> head,tail,bits;
<a name="l00169"></a>00169 kate_fp v;
<a name="l00170"></a>00170
<a name="l00171"></a>00171 <span class="keywordflow">if</span> (!kpb || count==0 || !values) <span class="keywordflow">return</span> KATE_E_INVALID_PARAMETER;
<a name="l00172"></a>00172
<a name="l00173"></a>00173 head=kate_pack_read(kpb,kate_fp_cut_bits_bits);
<a name="l00174"></a>00174 tail=kate_pack_read(kpb,kate_fp_cut_bits_bits);
<a name="l00175"></a>00175 bits=kate_fp_bits-head-tail;
<a name="l00176"></a>00176 <span class="keywordflow">while</span> (count--) {
<a name="l00177"></a>00177 <span class="keywordtype">int</span> sign=0;
<a name="l00178"></a>00178 <span class="keywordflow">if</span> (head>0) {
<a name="l00179"></a>00179 sign=kate_pack_read1(kpb);
<a name="l00180"></a>00180 }
<a name="l00181"></a>00181 <span class="preprocessor">#ifdef WRITE_64_IN_TWO_32</span>
<a name="l00182"></a>00182 <span class="preprocessor"></span> <span class="keywordflow">if</span> (bits>32) {
<a name="l00183"></a>00183 kate_fp low=kate_pack_read(kpb,32);
<a name="l00184"></a>00184 v=kate_pack_read(kpb,bits-32);
<a name="l00185"></a>00185 v<<=32;
<a name="l00186"></a>00186 v|=low;
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188 <span class="keywordflow">else</span>
<a name="l00189"></a>00189 <span class="preprocessor">#endif</span>
<a name="l00190"></a>00190 <span class="preprocessor"></span> {
<a name="l00191"></a>00191 v=kate_pack_read(kpb,bits);
<a name="l00192"></a>00192 }
<a name="l00193"></a>00193 v<<=tail;
<a name="l00194"></a>00194 <span class="keywordflow">if</span> (sign) v=-v;
<a name="l00195"></a>00195 *values=v;
<a name="l00196"></a>00196 values+=streams;
<a name="l00197"></a>00197 }
<a name="l00198"></a>00198
<a name="l00199"></a>00199 <span class="keywordflow">return</span> 0;
<a name="l00200"></a>00200 }
<a name="l00201"></a>00201
<a name="l00202"></a>00202 <span class="keywordtype">int</span> kate_fp_decode_kate_float(<span class="keywordtype">size_t</span> count,kate_float *values,<span class="keywordtype">size_t</span> streams,kate_pack_buffer *kpb)
<a name="l00203"></a>00203 {
<a name="l00204"></a>00204 kate_fp *fp_values;
<a name="l00205"></a>00205 <span class="keywordtype">size_t</span> s,n;
<a name="l00206"></a>00206 <span class="keywordtype">int</span> ret;
<a name="l00207"></a>00207
<a name="l00208"></a>00208 <span class="keywordflow">if</span> (count*streams==0) <span class="keywordflow">return</span> 0;
<a name="l00209"></a>00209
<a name="l00210"></a>00210 <span class="keywordflow">if</span> (streams>1 && count>MERGE_STREAMS_COUNT_THRESHOLD) {
<a name="l00211"></a>00211 <span class="keywordflow">if</span> (kate_pack_read1(kpb)) {
<a name="l00212"></a>00212 count*=streams;
<a name="l00213"></a>00213 streams=1;
<a name="l00214"></a>00214 }
<a name="l00215"></a>00215 }
<a name="l00216"></a>00216
<a name="l00217"></a>00217 fp_values=(kate_fp*)kate_checked_malloc(count,<span class="keyword">sizeof</span>(kate_fp));
<a name="l00218"></a>00218 <span class="keywordflow">if</span> (!fp_values) <span class="keywordflow">return</span> KATE_E_OUT_OF_MEMORY;
<a name="l00219"></a>00219
<a name="l00220"></a>00220 <span class="keywordflow">for</span> (s=0;s<streams;++s) {
<a name="l00221"></a>00221 ret=kate_fp_decode(count,fp_values,1,kpb);
<a name="l00222"></a>00222 <span class="keywordflow">if</span> (ret<0) {
<a name="l00223"></a>00223 kate_free(fp_values);
<a name="l00224"></a>00224 <span class="keywordflow">return</span> ret;
<a name="l00225"></a>00225 }
<a name="l00226"></a>00226
<a name="l00227"></a>00227 <span class="keywordflow">for</span> (n=0;n<count;++n) {
<a name="l00228"></a>00228 values[n*streams+s]=kfp2f(fp_values[n]);
<a name="l00229"></a>00229 }
<a name="l00230"></a>00230 }
<a name="l00231"></a>00231
<a name="l00232"></a>00232 kate_free(fp_values);
<a name="l00233"></a>00233
<a name="l00234"></a>00234 <span class="keywordflow">return</span> 0;
<a name="l00235"></a>00235 }
<a name="l00236"></a>00236
</pre></div></div>
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