134 lines
3 KiB
C
134 lines
3 KiB
C
#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include "entenc.h"
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#define EC_BUFFER_INCREMENT (256)
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void ec_byte_writeinit(ec_byte_buffer *_b){
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_b->ptr=_b->buf=malloc(EC_BUFFER_INCREMENT*sizeof(char));
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_b->storage=EC_BUFFER_INCREMENT;
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}
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void ec_byte_writetrunc(ec_byte_buffer *_b,long _bytes){
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_b->ptr=_b->buf+_bytes;
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}
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void ec_byte_write1(ec_byte_buffer *_b,unsigned _value){
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ptrdiff_t endbyte;
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endbyte=_b->ptr-_b->buf;
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if(endbyte>=_b->storage){
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_b->buf=realloc(_b->buf,(_b->storage+EC_BUFFER_INCREMENT)*sizeof(char));
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_b->storage+=EC_BUFFER_INCREMENT;
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_b->ptr=_b->buf+endbyte;
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}
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*(_b->ptr++)=(unsigned char)_value;
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}
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void ec_byte_write4(ec_byte_buffer *_b,ec_uint32 _value){
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ptrdiff_t endbyte;
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endbyte=_b->ptr-_b->buf;
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if(endbyte+4>_b->storage){
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_b->buf=realloc(_b->buf,(_b->storage+EC_BUFFER_INCREMENT)*sizeof(char));
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_b->storage+=EC_BUFFER_INCREMENT;
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_b->ptr=_b->buf+endbyte;
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}
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*(_b->ptr++)=(unsigned char)_value;
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_value>>=8;
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*(_b->ptr++)=(unsigned char)_value;
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_value>>=8;
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*(_b->ptr++)=(unsigned char)_value;
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_value>>=8;
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*(_b->ptr++)=(unsigned char)_value;
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}
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void ec_byte_writecopy(ec_byte_buffer *_b,void *_source,long _bytes){
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ptrdiff_t endbyte;
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endbyte=_b->ptr-_b->buf;
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if(endbyte+_bytes>_b->storage){
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_b->storage=endbyte+_bytes+EC_BUFFER_INCREMENT;
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_b->buf=realloc(_b->buf,_b->storage*sizeof(char));
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_b->ptr=_b->buf+endbyte;
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}
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memmove(_b->ptr,_source,_bytes);
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_b->ptr+=_bytes;
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}
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void ec_byte_writeclear(ec_byte_buffer *_b){
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free(_b->buf);
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}
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void ec_enc_bits(ec_enc *_this,ec_uint32 _fl,int _ftb){
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unsigned fl;
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unsigned ft;
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while(_ftb>EC_UNIT_BITS){
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_ftb-=EC_UNIT_BITS;
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fl=(unsigned)(_fl>>_ftb)&EC_UNIT_MASK;
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ec_encode(_this,fl,fl+1,EC_UNIT_MASK+1);
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}
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ft=1<<_ftb;
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fl=(unsigned)_fl&ft-1;
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ec_encode(_this,fl,fl+1,ft);
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}
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void ec_enc_bits64(ec_enc *_this,ec_uint64 _fl,int _ftb){
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if(_ftb>32){
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ec_enc_bits(_this,(ec_uint32)(_fl>>32),_ftb-32);
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_ftb=32;
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_fl&=0xFFFFFFFF;
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}
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ec_enc_bits(_this,(ec_uint32)_fl,_ftb);
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}
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void ec_enc_uint(ec_enc *_this,ec_uint32 _fl,ec_uint32 _ft){
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ec_uint32 mask;
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unsigned ft;
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unsigned fl;
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int ftb;
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_ft--;
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ftb=EC_ILOG(_ft)&-!!_ft;
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while(ftb>EC_UNIT_BITS){
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ftb-=EC_UNIT_BITS;
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ft=(_ft>>ftb)+1;
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fl=(unsigned)(_fl>>ftb);
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ec_encode(_this,fl,fl+1,ft);
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if(fl<ft-1){
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ec_enc_bits(_this,_fl,ftb);
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return;
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}
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mask=((ec_uint32)1<<ftb)-1;
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_fl=_fl&mask;
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_ft=_ft&mask;
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}
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ec_encode(_this,_fl,_fl+1,_ft+1);
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}
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void ec_enc_uint64(ec_enc *_this,ec_uint64 _fl,ec_uint64 _ft){
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ec_uint64 mask;
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unsigned ft;
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unsigned fl;
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int ftb;
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_ft--;
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ftb=EC_ILOG64(_ft)&-!!_ft;
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while(ftb>EC_UNIT_BITS){
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ftb-=EC_UNIT_BITS;
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ft=(unsigned)(_ft>>ftb)+1;
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fl=(unsigned)(_fl>>ftb);
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ec_encode(_this,fl,fl+1,ft);
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if(fl<ft-1){
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ec_enc_bits64(_this,_fl,ftb);
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return;
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}
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mask=((ec_uint64)1<<ftb)-1;
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_fl=_fl&mask;
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_ft=_ft&mask;
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}
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ec_encode(_this,_fl,_fl+1,_ft+1);
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}
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