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1 /********************************************************************
2  *                                                                  *
3  * THIS FILE IS PART OF THE Ogg CONTAINER SOURCE CODE.              *
4  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
5  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
7  *                                                                  *
8  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2010             *
9  * by the Xiph.Org Foundation http://www.xiph.org/                  *
10  *                                                                  *
11  ********************************************************************
12 
13   function: packing variable sized words into an octet stream
14   last mod: $Id: bitwise.c 16993 2010-03-21 23:15:46Z xiphmont $
15 
16  ********************************************************************/
17 
18 /* We're 'LSb' endian; if we write a word but read individual bits,
19    then we'll read the lsb first */
20 
21 #include <string.h>
22 #include <stdlib.h>
23 #include <ogg/ogg.h>
24 
25 #define BUFFER_INCREMENT 256
26 
27 static const unsigned long mask[]=
28 {0x00000000,0x00000001,0x00000003,0x00000007,0x0000000f,
29  0x0000001f,0x0000003f,0x0000007f,0x000000ff,0x000001ff,
30  0x000003ff,0x000007ff,0x00000fff,0x00001fff,0x00003fff,
31  0x00007fff,0x0000ffff,0x0001ffff,0x0003ffff,0x0007ffff,
32  0x000fffff,0x001fffff,0x003fffff,0x007fffff,0x00ffffff,
33  0x01ffffff,0x03ffffff,0x07ffffff,0x0fffffff,0x1fffffff,
34  0x3fffffff,0x7fffffff,0xffffffff };
35 
36 static const unsigned int mask8B[]=
37 {0x00,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff};
38 
oggpack_writeinit(oggpack_buffer * b)39 void oggpack_writeinit(oggpack_buffer *b){
40   memset(b,0,sizeof(*b));
41   b->ptr=b->buffer=_ogg_malloc(BUFFER_INCREMENT);
42   b->buffer[0]='\0';
43   b->storage=BUFFER_INCREMENT;
44 }
45 
oggpackB_writeinit(oggpack_buffer * b)46 void oggpackB_writeinit(oggpack_buffer *b){
47   oggpack_writeinit(b);
48 }
49 
oggpack_writecheck(oggpack_buffer * b)50 int oggpack_writecheck(oggpack_buffer *b){
51   if(!b->ptr || !b->storage)return -1;
52   return 0;
53 }
54 
oggpackB_writecheck(oggpack_buffer * b)55 int oggpackB_writecheck(oggpack_buffer *b){
56   return oggpack_writecheck(b);
57 }
58 
oggpack_writetrunc(oggpack_buffer * b,long bits)59 void oggpack_writetrunc(oggpack_buffer *b,long bits){
60   long bytes=bits>>3;
61   if(b->ptr){
62     bits-=bytes*8;
63     b->ptr=b->buffer+bytes;
64     b->endbit=bits;
65     b->endbyte=bytes;
66     *b->ptr&=mask[bits];
67   }
68 }
69 
oggpackB_writetrunc(oggpack_buffer * b,long bits)70 void oggpackB_writetrunc(oggpack_buffer *b,long bits){
71   long bytes=bits>>3;
72   if(b->ptr){
73     bits-=bytes*8;
74     b->ptr=b->buffer+bytes;
75     b->endbit=bits;
76     b->endbyte=bytes;
77     *b->ptr&=mask8B[bits];
78   }
79 }
80 
81 /* Takes only up to 32 bits. */
oggpack_write(oggpack_buffer * b,unsigned long value,int bits)82 void oggpack_write(oggpack_buffer *b,unsigned long value,int bits){
83   if(b->endbyte+4>=b->storage){
84     void *ret;
85     if(!b->ptr)return;
86     ret=_ogg_realloc(b->buffer,b->storage+BUFFER_INCREMENT);
87     if(!ret){
88       oggpack_writeclear(b);
89       return;
90     }
91     b->buffer=ret;
92     b->storage+=BUFFER_INCREMENT;
93     b->ptr=b->buffer+b->endbyte;
94   }
95 
96   value&=mask[bits];
97   bits+=b->endbit;
98 
99   b->ptr[0]|=value<<b->endbit;
100 
101   if(bits>=8){
102     b->ptr[1]=(unsigned char)(value>>(8-b->endbit));
103     if(bits>=16){
104       b->ptr[2]=(unsigned char)(value>>(16-b->endbit));
105       if(bits>=24){
106         b->ptr[3]=(unsigned char)(value>>(24-b->endbit));
107         if(bits>=32){
108           if(b->endbit)
109             b->ptr[4]=(unsigned char)(value>>(32-b->endbit));
110           else
111             b->ptr[4]=0;
112         }
113       }
114     }
115   }
116 
117   b->endbyte+=bits/8;
118   b->ptr+=bits/8;
119   b->endbit=bits&7;
120 }
121 
122 /* Takes only up to 32 bits. */
oggpackB_write(oggpack_buffer * b,unsigned long value,int bits)123 void oggpackB_write(oggpack_buffer *b,unsigned long value,int bits){
124   if(b->endbyte+4>=b->storage){
125     void *ret;
126     if(!b->ptr)return;
127     ret=_ogg_realloc(b->buffer,b->storage+BUFFER_INCREMENT);
128     if(!ret){
129       oggpack_writeclear(b);
130       return;
131     }
132     b->buffer=ret;
133     b->storage+=BUFFER_INCREMENT;
134     b->ptr=b->buffer+b->endbyte;
135   }
136 
137   value=(value&mask[bits])<<(32-bits);
138   bits+=b->endbit;
139 
140   b->ptr[0]|=value>>(24+b->endbit);
141 
142   if(bits>=8){
143     b->ptr[1]=(unsigned char)(value>>(16+b->endbit));
144     if(bits>=16){
145       b->ptr[2]=(unsigned char)(value>>(8+b->endbit));
146       if(bits>=24){
147         b->ptr[3]=(unsigned char)(value>>(b->endbit));
148         if(bits>=32){
149           if(b->endbit)
150             b->ptr[4]=(unsigned char)(value<<(8-b->endbit));
151           else
152             b->ptr[4]=0;
153         }
154       }
155     }
156   }
157 
158   b->endbyte+=bits/8;
159   b->ptr+=bits/8;
160   b->endbit=bits&7;
161 }
162 
oggpack_writealign(oggpack_buffer * b)163 void oggpack_writealign(oggpack_buffer *b){
164   int bits=8-b->endbit;
165   if(bits<8)
166     oggpack_write(b,0,bits);
167 }
168 
oggpackB_writealign(oggpack_buffer * b)169 void oggpackB_writealign(oggpack_buffer *b){
170   int bits=8-b->endbit;
171   if(bits<8)
172     oggpackB_write(b,0,bits);
173 }
174 
oggpack_writecopy_helper(oggpack_buffer * b,void * source,long bits,void (* w)(oggpack_buffer *,unsigned long,int),int msb)175 static void oggpack_writecopy_helper(oggpack_buffer *b,
176                                      void *source,
177                                      long bits,
178                                      void (*w)(oggpack_buffer *,
179                                                unsigned long,
180                                                int),
181                                      int msb){
182   unsigned char *ptr=(unsigned char *)source;
183 
184   long bytes=bits/8;
185   bits-=bytes*8;
186 
187   if(b->endbit){
188     int i;
189     /* unaligned copy.  Do it the hard way. */
190     for(i=0;i<bytes;i++)
191       w(b,(unsigned long)(ptr[i]),8);
192   }else{
193     /* aligned block copy */
194     if(b->endbyte+bytes+1>=b->storage){
195       void *ret;
196       if(!b->ptr)return;
197       b->storage=b->endbyte+bytes+BUFFER_INCREMENT;
198       ret=_ogg_realloc(b->buffer,b->storage);
199       if(!ret){
200         oggpack_writeclear(b);
201         return;
202       }
203       b->buffer=ret;
204       b->ptr=b->buffer+b->endbyte;
205     }
206 
207     memmove(b->ptr,source,bytes);
208     b->ptr+=bytes;
209     b->endbyte+=bytes;
210     *b->ptr=0;
211 
212   }
213   if(bits){
214     if(msb)
215       w(b,(unsigned long)(ptr[bytes]>>(8-bits)),bits);
216     else
217       w(b,(unsigned long)(ptr[bytes]),bits);
218   }
219 }
220 
oggpack_writecopy(oggpack_buffer * b,void * source,long bits)221 void oggpack_writecopy(oggpack_buffer *b,void *source,long bits){
222   oggpack_writecopy_helper(b,source,bits,oggpack_write,0);
223 }
224 
oggpackB_writecopy(oggpack_buffer * b,void * source,long bits)225 void oggpackB_writecopy(oggpack_buffer *b,void *source,long bits){
226   oggpack_writecopy_helper(b,source,bits,oggpackB_write,1);
227 }
228 
oggpack_reset(oggpack_buffer * b)229 void oggpack_reset(oggpack_buffer *b){
230   if(!b->ptr)return;
231   b->ptr=b->buffer;
232   b->buffer[0]=0;
233   b->endbit=b->endbyte=0;
234 }
235 
oggpackB_reset(oggpack_buffer * b)236 void oggpackB_reset(oggpack_buffer *b){
237   oggpack_reset(b);
238 }
239 
oggpack_writeclear(oggpack_buffer * b)240 void oggpack_writeclear(oggpack_buffer *b){
241   if(b->buffer)_ogg_free(b->buffer);
242   memset(b,0,sizeof(*b));
243 }
244 
oggpackB_writeclear(oggpack_buffer * b)245 void oggpackB_writeclear(oggpack_buffer *b){
246   oggpack_writeclear(b);
247 }
248 
oggpack_readinit(oggpack_buffer * b,unsigned char * buf,int bytes)249 void oggpack_readinit(oggpack_buffer *b,unsigned char *buf,int bytes){
250   memset(b,0,sizeof(*b));
251   b->buffer=b->ptr=buf;
252   b->storage=bytes;
253 }
254 
oggpackB_readinit(oggpack_buffer * b,unsigned char * buf,int bytes)255 void oggpackB_readinit(oggpack_buffer *b,unsigned char *buf,int bytes){
256   oggpack_readinit(b,buf,bytes);
257 }
258 
259 /* Read in bits without advancing the bitptr; bits <= 32 */
oggpack_look(oggpack_buffer * b,int bits)260 long oggpack_look(oggpack_buffer *b,int bits){
261   unsigned long ret;
262   unsigned long m=mask[bits];
263 
264   bits+=b->endbit;
265 
266   if(b->endbyte+4>=b->storage){
267     /* not the main path */
268     if(b->endbyte*8+bits>b->storage*8)return(-1);
269   }
270 
271   ret=b->ptr[0]>>b->endbit;
272   if(bits>8){
273     ret|=b->ptr[1]<<(8-b->endbit);
274     if(bits>16){
275       ret|=b->ptr[2]<<(16-b->endbit);
276       if(bits>24){
277         ret|=b->ptr[3]<<(24-b->endbit);
278         if(bits>32 && b->endbit)
279           ret|=b->ptr[4]<<(32-b->endbit);
280       }
281     }
282   }
283   return(m&ret);
284 }
285 
286 /* Read in bits without advancing the bitptr; bits <= 32 */
oggpackB_look(oggpack_buffer * b,int bits)287 long oggpackB_look(oggpack_buffer *b,int bits){
288   unsigned long ret;
289   int m=32-bits;
290 
291   bits+=b->endbit;
292 
293   if(b->endbyte+4>=b->storage){
294     /* not the main path */
295     if(b->endbyte*8+bits>b->storage*8)return(-1);
296   }
297 
298   ret=b->ptr[0]<<(24+b->endbit);
299   if(bits>8){
300     ret|=b->ptr[1]<<(16+b->endbit);
301     if(bits>16){
302       ret|=b->ptr[2]<<(8+b->endbit);
303       if(bits>24){
304         ret|=b->ptr[3]<<(b->endbit);
305         if(bits>32 && b->endbit)
306           ret|=b->ptr[4]>>(8-b->endbit);
307       }
308     }
309   }
310   return ((ret&0xffffffff)>>(m>>1))>>((m+1)>>1);
311 }
312 
oggpack_look1(oggpack_buffer * b)313 long oggpack_look1(oggpack_buffer *b){
314   if(b->endbyte>=b->storage)return(-1);
315   return((b->ptr[0]>>b->endbit)&1);
316 }
317 
oggpackB_look1(oggpack_buffer * b)318 long oggpackB_look1(oggpack_buffer *b){
319   if(b->endbyte>=b->storage)return(-1);
320   return((b->ptr[0]>>(7-b->endbit))&1);
321 }
322 
oggpack_adv(oggpack_buffer * b,int bits)323 void oggpack_adv(oggpack_buffer *b,int bits){
324   bits+=b->endbit;
325   b->ptr+=bits/8;
326   b->endbyte+=bits/8;
327   b->endbit=bits&7;
328 }
329 
oggpackB_adv(oggpack_buffer * b,int bits)330 void oggpackB_adv(oggpack_buffer *b,int bits){
331   oggpack_adv(b,bits);
332 }
333 
oggpack_adv1(oggpack_buffer * b)334 void oggpack_adv1(oggpack_buffer *b){
335   if(++(b->endbit)>7){
336     b->endbit=0;
337     b->ptr++;
338     b->endbyte++;
339   }
340 }
341 
oggpackB_adv1(oggpack_buffer * b)342 void oggpackB_adv1(oggpack_buffer *b){
343   oggpack_adv1(b);
344 }
345 
346 /* bits <= 32 */
oggpack_read(oggpack_buffer * b,int bits)347 long oggpack_read(oggpack_buffer *b,int bits){
348   long ret;
349   unsigned long m=mask[bits];
350 
351   bits+=b->endbit;
352 
353   if(b->endbyte+4>=b->storage){
354     /* not the main path */
355     ret=-1L;
356     if(b->endbyte*8+bits>b->storage*8)goto overflow;
357   }
358 
359   ret=b->ptr[0]>>b->endbit;
360   if(bits>8){
361     ret|=b->ptr[1]<<(8-b->endbit);
362     if(bits>16){
363       ret|=b->ptr[2]<<(16-b->endbit);
364       if(bits>24){
365         ret|=b->ptr[3]<<(24-b->endbit);
366         if(bits>32 && b->endbit){
367           ret|=b->ptr[4]<<(32-b->endbit);
368         }
369       }
370     }
371   }
372   ret&=m;
373 
374  overflow:
375 
376   b->ptr+=bits/8;
377   b->endbyte+=bits/8;
378   b->endbit=bits&7;
379   return(ret);
380 }
381 
382 /* bits <= 32 */
oggpackB_read(oggpack_buffer * b,int bits)383 long oggpackB_read(oggpack_buffer *b,int bits){
384   long ret;
385   long m=32-bits;
386 
387   bits+=b->endbit;
388 
389   if(b->endbyte+4>=b->storage){
390     /* not the main path */
391     ret=-1L;
392     if(b->endbyte*8+bits>b->storage*8)goto overflow;
393     /* special case to avoid reading b->ptr[0], which might be past the end of
394         the buffer; also skips some useless accounting */
395     else if(!bits)return(0L);
396   }
397 
398   ret=b->ptr[0]<<(24+b->endbit);
399   if(bits>8){
400     ret|=b->ptr[1]<<(16+b->endbit);
401     if(bits>16){
402       ret|=b->ptr[2]<<(8+b->endbit);
403       if(bits>24){
404         ret|=b->ptr[3]<<(b->endbit);
405         if(bits>32 && b->endbit)
406           ret|=b->ptr[4]>>(8-b->endbit);
407       }
408     }
409   }
410   ret=((ret&0xffffffffUL)>>(m>>1))>>((m+1)>>1);
411 
412  overflow:
413 
414   b->ptr+=bits/8;
415   b->endbyte+=bits/8;
416   b->endbit=bits&7;
417   return(ret);
418 }
419 
oggpack_read1(oggpack_buffer * b)420 long oggpack_read1(oggpack_buffer *b){
421   long ret;
422 
423   if(b->endbyte>=b->storage){
424     /* not the main path */
425     ret=-1L;
426     goto overflow;
427   }
428 
429   ret=(b->ptr[0]>>b->endbit)&1;
430 
431  overflow:
432 
433   b->endbit++;
434   if(b->endbit>7){
435     b->endbit=0;
436     b->ptr++;
437     b->endbyte++;
438   }
439   return(ret);
440 }
441 
oggpackB_read1(oggpack_buffer * b)442 long oggpackB_read1(oggpack_buffer *b){
443   long ret;
444 
445   if(b->endbyte>=b->storage){
446     /* not the main path */
447     ret=-1L;
448     goto overflow;
449   }
450 
451   ret=(b->ptr[0]>>(7-b->endbit))&1;
452 
453  overflow:
454 
455   b->endbit++;
456   if(b->endbit>7){
457     b->endbit=0;
458     b->ptr++;
459     b->endbyte++;
460   }
461   return(ret);
462 }
463 
oggpack_bytes(oggpack_buffer * b)464 long oggpack_bytes(oggpack_buffer *b){
465   return(b->endbyte+(b->endbit+7)/8);
466 }
467 
oggpack_bits(oggpack_buffer * b)468 long oggpack_bits(oggpack_buffer *b){
469   return(b->endbyte*8+b->endbit);
470 }
471 
oggpackB_bytes(oggpack_buffer * b)472 long oggpackB_bytes(oggpack_buffer *b){
473   return oggpack_bytes(b);
474 }
475 
oggpackB_bits(oggpack_buffer * b)476 long oggpackB_bits(oggpack_buffer *b){
477   return oggpack_bits(b);
478 }
479 
oggpack_get_buffer(oggpack_buffer * b)480 unsigned char *oggpack_get_buffer(oggpack_buffer *b){
481   return(b->buffer);
482 }
483 
oggpackB_get_buffer(oggpack_buffer * b)484 unsigned char *oggpackB_get_buffer(oggpack_buffer *b){
485   return oggpack_get_buffer(b);
486 }
487 
488 /* Self test of the bitwise routines; everything else is based on
489    them, so they damned well better be solid. */
490 
491 #ifdef _V_SELFTEST
492 #include <stdio.h>
493 
ilog(unsigned int v)494 static int ilog(unsigned int v){
495   int ret=0;
496   while(v){
497     ret++;
498     v>>=1;
499   }
500   return(ret);
501 }
502 
503 oggpack_buffer o;
504 oggpack_buffer r;
505 
report(char * in)506 void report(char *in){
507   fprintf(stderr,"%s",in);
508   exit(1);
509 }
510 
cliptest(unsigned long * b,int vals,int bits,int * comp,int compsize)511 void cliptest(unsigned long *b,int vals,int bits,int *comp,int compsize){
512   long bytes,i;
513   unsigned char *buffer;
514 
515   oggpack_reset(&o);
516   for(i=0;i<vals;i++)
517     oggpack_write(&o,b[i],bits?bits:ilog(b[i]));
518   buffer=oggpack_get_buffer(&o);
519   bytes=oggpack_bytes(&o);
520   if(bytes!=compsize)report("wrong number of bytes!\n");
521   for(i=0;i<bytes;i++)if(buffer[i]!=comp[i]){
522     for(i=0;i<bytes;i++)fprintf(stderr,"%x %x\n",(int)buffer[i],(int)comp[i]);
523     report("wrote incorrect value!\n");
524   }
525   oggpack_readinit(&r,buffer,bytes);
526   for(i=0;i<vals;i++){
527     int tbit=bits?bits:ilog(b[i]);
528     if(oggpack_look(&r,tbit)==-1)
529       report("out of data!\n");
530     if(oggpack_look(&r,tbit)!=(b[i]&mask[tbit]))
531       report("looked at incorrect value!\n");
532     if(tbit==1)
533       if(oggpack_look1(&r)!=(b[i]&mask[tbit]))
534         report("looked at single bit incorrect value!\n");
535     if(tbit==1){
536       if(oggpack_read1(&r)!=(b[i]&mask[tbit]))
537         report("read incorrect single bit value!\n");
538     }else{
539     if(oggpack_read(&r,tbit)!=(b[i]&mask[tbit]))
540       report("read incorrect value!\n");
541     }
542   }
543   if(oggpack_bytes(&r)!=bytes)report("leftover bytes after read!\n");
544 }
545 
cliptestB(unsigned long * b,int vals,int bits,int * comp,int compsize)546 void cliptestB(unsigned long *b,int vals,int bits,int *comp,int compsize){
547   long bytes,i;
548   unsigned char *buffer;
549 
550   oggpackB_reset(&o);
551   for(i=0;i<vals;i++)
552     oggpackB_write(&o,b[i],bits?bits:ilog(b[i]));
553   buffer=oggpackB_get_buffer(&o);
554   bytes=oggpackB_bytes(&o);
555   if(bytes!=compsize)report("wrong number of bytes!\n");
556   for(i=0;i<bytes;i++)if(buffer[i]!=comp[i]){
557     for(i=0;i<bytes;i++)fprintf(stderr,"%x %x\n",(int)buffer[i],(int)comp[i]);
558     report("wrote incorrect value!\n");
559   }
560   oggpackB_readinit(&r,buffer,bytes);
561   for(i=0;i<vals;i++){
562     int tbit=bits?bits:ilog(b[i]);
563     if(oggpackB_look(&r,tbit)==-1)
564       report("out of data!\n");
565     if(oggpackB_look(&r,tbit)!=(b[i]&mask[tbit]))
566       report("looked at incorrect value!\n");
567     if(tbit==1)
568       if(oggpackB_look1(&r)!=(b[i]&mask[tbit]))
569         report("looked at single bit incorrect value!\n");
570     if(tbit==1){
571       if(oggpackB_read1(&r)!=(b[i]&mask[tbit]))
572         report("read incorrect single bit value!\n");
573     }else{
574     if(oggpackB_read(&r,tbit)!=(b[i]&mask[tbit]))
575       report("read incorrect value!\n");
576     }
577   }
578   if(oggpackB_bytes(&r)!=bytes)report("leftover bytes after read!\n");
579 }
580 
main(void)581 int main(void){
582   unsigned char *buffer;
583   long bytes,i;
584   static unsigned long testbuffer1[]=
585     {18,12,103948,4325,543,76,432,52,3,65,4,56,32,42,34,21,1,23,32,546,456,7,
586        567,56,8,8,55,3,52,342,341,4,265,7,67,86,2199,21,7,1,5,1,4};
587   int test1size=43;
588 
589   static unsigned long testbuffer2[]=
590     {216531625L,1237861823,56732452,131,3212421,12325343,34547562,12313212,
591        1233432,534,5,346435231,14436467,7869299,76326614,167548585,
592        85525151,0,12321,1,349528352};
593   int test2size=21;
594 
595   static unsigned long testbuffer3[]=
596     {1,0,14,0,1,0,12,0,1,0,0,0,1,1,0,1,0,1,0,1,0,1,0,1,0,1,0,0,1,1,1,1,1,0,0,1,
597        0,1,30,1,1,1,0,0,1,0,0,0,12,0,11,0,1,0,0,1};
598   int test3size=56;
599 
600   static unsigned long large[]=
601     {2136531625L,2137861823,56732452,131,3212421,12325343,34547562,12313212,
602        1233432,534,5,2146435231,14436467,7869299,76326614,167548585,
603        85525151,0,12321,1,2146528352};
604 
605   int onesize=33;
606   static int one[33]={146,25,44,151,195,15,153,176,233,131,196,65,85,172,47,40,
607                     34,242,223,136,35,222,211,86,171,50,225,135,214,75,172,
608                     223,4};
609   static int oneB[33]={150,101,131,33,203,15,204,216,105,193,156,65,84,85,222,
610                        8,139,145,227,126,34,55,244,171,85,100,39,195,173,18,
611                        245,251,128};
612 
613   int twosize=6;
614   static int two[6]={61,255,255,251,231,29};
615   static int twoB[6]={247,63,255,253,249,120};
616 
617   int threesize=54;
618   static int three[54]={169,2,232,252,91,132,156,36,89,13,123,176,144,32,254,
619                       142,224,85,59,121,144,79,124,23,67,90,90,216,79,23,83,
620                       58,135,196,61,55,129,183,54,101,100,170,37,127,126,10,
621                       100,52,4,14,18,86,77,1};
622   static int threeB[54]={206,128,42,153,57,8,183,251,13,89,36,30,32,144,183,
623                          130,59,240,121,59,85,223,19,228,180,134,33,107,74,98,
624                          233,253,196,135,63,2,110,114,50,155,90,127,37,170,104,
625                          200,20,254,4,58,106,176,144,0};
626 
627   int foursize=38;
628   static int four[38]={18,6,163,252,97,194,104,131,32,1,7,82,137,42,129,11,72,
629                      132,60,220,112,8,196,109,64,179,86,9,137,195,208,122,169,
630                      28,2,133,0,1};
631   static int fourB[38]={36,48,102,83,243,24,52,7,4,35,132,10,145,21,2,93,2,41,
632                         1,219,184,16,33,184,54,149,170,132,18,30,29,98,229,67,
633                         129,10,4,32};
634 
635   int fivesize=45;
636   static int five[45]={169,2,126,139,144,172,30,4,80,72,240,59,130,218,73,62,
637                      241,24,210,44,4,20,0,248,116,49,135,100,110,130,181,169,
638                      84,75,159,2,1,0,132,192,8,0,0,18,22};
639   static int fiveB[45]={1,84,145,111,245,100,128,8,56,36,40,71,126,78,213,226,
640                         124,105,12,0,133,128,0,162,233,242,67,152,77,205,77,
641                         172,150,169,129,79,128,0,6,4,32,0,27,9,0};
642 
643   int sixsize=7;
644   static int six[7]={17,177,170,242,169,19,148};
645   static int sixB[7]={136,141,85,79,149,200,41};
646 
647   /* Test read/write together */
648   /* Later we test against pregenerated bitstreams */
649   oggpack_writeinit(&o);
650 
651   fprintf(stderr,"\nSmall preclipped packing (LSb): ");
652   cliptest(testbuffer1,test1size,0,one,onesize);
653   fprintf(stderr,"ok.");
654 
655   fprintf(stderr,"\nNull bit call (LSb): ");
656   cliptest(testbuffer3,test3size,0,two,twosize);
657   fprintf(stderr,"ok.");
658 
659   fprintf(stderr,"\nLarge preclipped packing (LSb): ");
660   cliptest(testbuffer2,test2size,0,three,threesize);
661   fprintf(stderr,"ok.");
662 
663   fprintf(stderr,"\n32 bit preclipped packing (LSb): ");
664   oggpack_reset(&o);
665   for(i=0;i<test2size;i++)
666     oggpack_write(&o,large[i],32);
667   buffer=oggpack_get_buffer(&o);
668   bytes=oggpack_bytes(&o);
669   oggpack_readinit(&r,buffer,bytes);
670   for(i=0;i<test2size;i++){
671     if(oggpack_look(&r,32)==-1)report("out of data. failed!");
672     if(oggpack_look(&r,32)!=large[i]){
673       fprintf(stderr,"%ld != %ld (%lx!=%lx):",oggpack_look(&r,32),large[i],
674               oggpack_look(&r,32),large[i]);
675       report("read incorrect value!\n");
676     }
677     oggpack_adv(&r,32);
678   }
679   if(oggpack_bytes(&r)!=bytes)report("leftover bytes after read!\n");
680   fprintf(stderr,"ok.");
681 
682   fprintf(stderr,"\nSmall unclipped packing (LSb): ");
683   cliptest(testbuffer1,test1size,7,four,foursize);
684   fprintf(stderr,"ok.");
685 
686   fprintf(stderr,"\nLarge unclipped packing (LSb): ");
687   cliptest(testbuffer2,test2size,17,five,fivesize);
688   fprintf(stderr,"ok.");
689 
690   fprintf(stderr,"\nSingle bit unclipped packing (LSb): ");
691   cliptest(testbuffer3,test3size,1,six,sixsize);
692   fprintf(stderr,"ok.");
693 
694   fprintf(stderr,"\nTesting read past end (LSb): ");
695   oggpack_readinit(&r,"\0\0\0\0\0\0\0\0",8);
696   for(i=0;i<64;i++){
697     if(oggpack_read(&r,1)!=0){
698       fprintf(stderr,"failed; got -1 prematurely.\n");
699       exit(1);
700     }
701   }
702   if(oggpack_look(&r,1)!=-1 ||
703      oggpack_read(&r,1)!=-1){
704       fprintf(stderr,"failed; read past end without -1.\n");
705       exit(1);
706   }
707   oggpack_readinit(&r,"\0\0\0\0\0\0\0\0",8);
708   if(oggpack_read(&r,30)!=0 || oggpack_read(&r,16)!=0){
709       fprintf(stderr,"failed 2; got -1 prematurely.\n");
710       exit(1);
711   }
712 
713   if(oggpack_look(&r,18)!=0 ||
714      oggpack_look(&r,18)!=0){
715     fprintf(stderr,"failed 3; got -1 prematurely.\n");
716       exit(1);
717   }
718   if(oggpack_look(&r,19)!=-1 ||
719      oggpack_look(&r,19)!=-1){
720     fprintf(stderr,"failed; read past end without -1.\n");
721       exit(1);
722   }
723   if(oggpack_look(&r,32)!=-1 ||
724      oggpack_look(&r,32)!=-1){
725     fprintf(stderr,"failed; read past end without -1.\n");
726       exit(1);
727   }
728   oggpack_writeclear(&o);
729   fprintf(stderr,"ok.\n");
730 
731   /********** lazy, cut-n-paste retest with MSb packing ***********/
732 
733   /* Test read/write together */
734   /* Later we test against pregenerated bitstreams */
735   oggpackB_writeinit(&o);
736 
737   fprintf(stderr,"\nSmall preclipped packing (MSb): ");
738   cliptestB(testbuffer1,test1size,0,oneB,onesize);
739   fprintf(stderr,"ok.");
740 
741   fprintf(stderr,"\nNull bit call (MSb): ");
742   cliptestB(testbuffer3,test3size,0,twoB,twosize);
743   fprintf(stderr,"ok.");
744 
745   fprintf(stderr,"\nLarge preclipped packing (MSb): ");
746   cliptestB(testbuffer2,test2size,0,threeB,threesize);
747   fprintf(stderr,"ok.");
748 
749   fprintf(stderr,"\n32 bit preclipped packing (MSb): ");
750   oggpackB_reset(&o);
751   for(i=0;i<test2size;i++)
752     oggpackB_write(&o,large[i],32);
753   buffer=oggpackB_get_buffer(&o);
754   bytes=oggpackB_bytes(&o);
755   oggpackB_readinit(&r,buffer,bytes);
756   for(i=0;i<test2size;i++){
757     if(oggpackB_look(&r,32)==-1)report("out of data. failed!");
758     if(oggpackB_look(&r,32)!=large[i]){
759       fprintf(stderr,"%ld != %ld (%lx!=%lx):",oggpackB_look(&r,32),large[i],
760               oggpackB_look(&r,32),large[i]);
761       report("read incorrect value!\n");
762     }
763     oggpackB_adv(&r,32);
764   }
765   if(oggpackB_bytes(&r)!=bytes)report("leftover bytes after read!\n");
766   fprintf(stderr,"ok.");
767 
768   fprintf(stderr,"\nSmall unclipped packing (MSb): ");
769   cliptestB(testbuffer1,test1size,7,fourB,foursize);
770   fprintf(stderr,"ok.");
771 
772   fprintf(stderr,"\nLarge unclipped packing (MSb): ");
773   cliptestB(testbuffer2,test2size,17,fiveB,fivesize);
774   fprintf(stderr,"ok.");
775 
776   fprintf(stderr,"\nSingle bit unclipped packing (MSb): ");
777   cliptestB(testbuffer3,test3size,1,sixB,sixsize);
778   fprintf(stderr,"ok.");
779 
780   fprintf(stderr,"\nTesting read past end (MSb): ");
781   oggpackB_readinit(&r,"\0\0\0\0\0\0\0\0",8);
782   for(i=0;i<64;i++){
783     if(oggpackB_read(&r,1)!=0){
784       fprintf(stderr,"failed; got -1 prematurely.\n");
785       exit(1);
786     }
787   }
788   if(oggpackB_look(&r,1)!=-1 ||
789      oggpackB_read(&r,1)!=-1){
790       fprintf(stderr,"failed; read past end without -1.\n");
791       exit(1);
792   }
793   oggpackB_readinit(&r,"\0\0\0\0\0\0\0\0",8);
794   if(oggpackB_read(&r,30)!=0 || oggpackB_read(&r,16)!=0){
795       fprintf(stderr,"failed 2; got -1 prematurely.\n");
796       exit(1);
797   }
798 
799   if(oggpackB_look(&r,18)!=0 ||
800      oggpackB_look(&r,18)!=0){
801     fprintf(stderr,"failed 3; got -1 prematurely.\n");
802       exit(1);
803   }
804   if(oggpackB_look(&r,19)!=-1 ||
805      oggpackB_look(&r,19)!=-1){
806     fprintf(stderr,"failed; read past end without -1.\n");
807       exit(1);
808   }
809   if(oggpackB_look(&r,32)!=-1 ||
810      oggpackB_look(&r,32)!=-1){
811     fprintf(stderr,"failed; read past end without -1.\n");
812       exit(1);
813   }
814   oggpackB_writeclear(&o);
815   fprintf(stderr,"ok.\n\n");
816 
817 
818   return(0);
819 }
820 #endif  /* _V_SELFTEST */
821 
822 #undef BUFFER_INCREMENT
823