/********************************************************************
?*??????????????????????????????????????????????????????????????????*
?*?THIS?FILE?IS?PART?OF?THE?Ogg?CONTAINER?SOURCE?CODE.??????????????*
?*?USE?DISTRIBUTION?AND?REPRODUCTION?OF?THIS?LIBRARY?SOURCE?IS?????*
?*?GOVERNED?BY?A?BSD-style?SOURCE?LICENSE?INCLUDED?WITH?THIS?SOURCE?*
?*?IN?‘COPYING‘.?PLEASE?READ?THESE?TERMS?BEFORE?DISTRIBUTING.???????*
?*??????????????????????????????????????????????????????????????????*
?*?THE?OggVorbis?SOURCE?CODE?IS?（C）?COPYRIGHT?1994-2014?????????????*
?*?by?the?Xiph.Org?Foundation?http://www.xiph.org/??????????????????*
?*??????????????????????????????????????????????????????????????????*
?********************************************************************

??function:?packing?variable?sized?words?into?an?octet?stream
??last?mod:?$Id$

?********************************************************************/

/*?We‘re?‘LSb‘?endian;?if?we?write?a?word?but?read?individual?bits
???then?we‘ll?read?the?lsb?first?*/

#include?
#include?
#include?
#include?

#define?BUFFER_INCREMENT?256

static?const?unsigned?long?mask[]=
{0x000000000x000000010x000000030x000000070x0000000f
?0x0000001f0x0000003f0x0000007f0x000000ff0x000001ff
?0x000003ff0x000007ff0x00000fff0x00001fff0x00003fff
?0x00007fff0x0000ffff0x0001ffff0x0003ffff0x0007ffff
?0x000fffff0x001fffff0x003fffff0x007fffff0x00ffffff
?0x01ffffff0x03ffffff0x07ffffff0x0fffffff0x1fffffff
?0x3fffffff0x7fffffff0xffffffff?};

static?const?unsigned?int?mask8B[]=
{0x000x800xc00xe00xf00xf80xfc0xfe0xff};

void?oggpack_writeinit（oggpack_buffer?*b）{
??memset（b0sizeof（*b））;
??b->ptr=b->buffer=_ogg_malloc（BUFFER_INCREMENT）;
??b->buffer[0]=‘\0‘;
??b->storage=BUFFER_INCREMENT;
}

void?oggpackB_writeinit（oggpack_buffer?*b）{
??oggpack_writeinit（b）;
}

int?oggpack_writecheck（oggpack_buffer?*b）{
??if（!b->ptr?||?!b->storage）return?-1;
??return?0;
}

int?oggpackB_writecheck（oggpack_buffer?*b）{
??return?oggpack_writecheck（b）;
}

void?oggpack_writetrunc（oggpack_buffer?*blong?bits）{
??long?bytes=bits>>3;
??if（b->ptr）{
????bits-=bytes*8;
????b->ptr=b->buffer+bytes;
????b->endbit=bits;
????b->endbyte=bytes;
????*b->ptr&=mask[bits];
??}
}

void?oggpackB_writetrunc（oggpack_buffer?*blong?bits）{
??long?bytes=bits>>3;
??if（b->ptr）{
????bits-=bytes*8;
????b->ptr=b->buffer+bytes;
????b->endbit=bits;
????b->endbyte=bytes;
????*b->ptr&=mask8B[bits];
??}
}

/*?Takes?only?up?to?32?bits.?*/
void?oggpack_write（oggpack_buffer?*bunsigned?long?valueint?bits）{
??if（bits<0?||?bits>32）?goto?err;
??if（b->endbyte>=b->storage-4）{
????void?*ret;
????if（!b->ptr）return;
????if（b->storage>LONG_MAX-BUFFER_INCREMENT）?goto?err;
????ret=_ogg_realloc（b->bufferb->storage+BUFFER_INCREMENT）;
????if（!ret）?goto?err;
????b->buffer=ret;
????b->storage+=BUFFER_INCREMENT;
????b->ptr=b->buffer+b->endbyte;
??}

??value&=mask[bits];
??bits+=b->endbit;

??b->ptr[0]|=value<endbit;

??if（bi