ref: 134492afd3efee0f4259ff4a00c4c6a101ed1f8d
dir: /tests/ectest.c/
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "bitrenc.h"
#include "entcode.h"
#include "entenc.h"
#include "entdec.h"
int main(int _argc,char **_argv){
ec_byte_buffer buf;
ec_enc enc;
ec_dec dec;
ec_uint64 sym64;
long nbits;
long nbits2;
double entropy;
int ft;
int ftb;
int sym;
int sz;
int s;
int i;
entropy=0;
/*Testing encoding of raw bit values.*/
ec_byte_writeinit(&buf);
ec_enc_init(&enc,&buf);
for(ft=0;ft<1024;ft++){
for(i=0;i<ft;i++){
entropy+=log(ft)*M_LOG2E;
ec_enc_uint(&enc,i,ft);
entropy+=log(ft)*M_LOG2E+30;
ec_enc_uint64(&enc,(ec_uint64)i<<30|i,(ec_uint64)ft<<30);
}
}
/*Testing encoding of raw bit values.*/
for(ftb=0;ftb<16;ftb++){
for(i=0;i<(1<<ftb);i++){
entropy+=ftb;
nbits=ec_enc_tell(&enc,0);
ec_enc_bits(&enc,i,ftb);
nbits2=ec_enc_tell(&enc,0);
if(nbits2-nbits!=ftb){
fprintf(stderr,"Used %li bits to encode %i bits directly.\n",
nbits2-nbits,ftb);
}
entropy+=ftb+30;
nbits=nbits2;
ec_enc_bits64(&enc,(ec_uint64)i<<30|i,ftb+30);
nbits2=ec_enc_tell(&enc,0);
if(nbits2-nbits!=ftb+30){
fprintf(stderr,"Used %li bits to encode %i bits directly.\n",
nbits2-nbits,ftb+30);
}
}
}
nbits=ec_enc_tell(&enc,4);
ec_enc_done(&enc);
fprintf(stderr,
"Encoded %0.2lf bits of entropy to %0.2lf bits (%0.3lf%% wasted).\n",
entropy,ldexp(nbits,-4),100*(nbits-ldexp(entropy,4))/nbits);
fprintf(stderr,"Packed to %li bytes.\n",(long)(buf.ptr-buf.buf));
ec_byte_readinit(&buf,ec_byte_get_buffer(&buf),ec_byte_bytes(&buf));
ec_dec_init(&dec,&buf);
for(ft=0;ft<1024;ft++){
for(i=0;i<ft;i++){
sym=ec_dec_uint(&dec,ft);
if(sym!=i){
fprintf(stderr,"Decoded %i instead of %i with ft of %i.\n",sym,i,ft);
return -1;
}
sym64=ec_dec_uint64(&dec,(ec_uint64)ft<<30);
if(sym64!=((ec_uint64)i<<30|i)){
fprintf(stderr,"Decoded %lli instead of %lli with ft of %lli.\n",sym64,
(ec_uint64)i<<30|i,(ec_uint64)ft<<30);
}
}
}
for(ftb=0;ftb<16;ftb++){
for(i=0;i<(1<<ftb);i++){
sym=ec_dec_bits(&dec,ftb);
if(sym!=i){
fprintf(stderr,"Decoded %i instead of %i with ftb of %i.\n",sym,i,ftb);
return -1;
}
sym64=ec_dec_bits64(&dec,ftb+30);
if(sym64!=((ec_uint64)i<<30|i)){
fprintf(stderr,"Decoded %lli instead of %lli with ftb of %i.\n",
sym64,(ec_uint64)i<<30|i,ftb+30);
}
}
}
nbits2=ec_dec_tell(&dec,4);
if(nbits!=nbits2){
fprintf(stderr,
"Reported number of bits used was %0.2lf, should be %0.2lf.\n",
ldexp(nbits2,-4),ldexp(nbits,-4));
}
ec_byte_writeclear(&buf);
fprintf(stderr,"Testing random streams...\n");
srand(0);
for(i=0;i<4096;i++){
unsigned *data;
int j;
int tell_bits;
int zeros;
ft=rand()/((RAND_MAX>>9)+1)+512;
sz=rand()/((RAND_MAX>>9)+1);
data=(unsigned *)malloc(sz*sizeof(*data));
ec_byte_writeinit(&buf);
ec_enc_init(&enc,&buf);
zeros = rand()%13==0;
for(j=0;j<sz;j++){
if (zeros)
data[j]=0;
else
data[j]=rand()%ft;
ec_enc_uint(&enc,data[j],ft);
}
tell_bits = ec_enc_tell(&enc, 0);
ec_enc_done(&enc);
if ((tell_bits+7)/8 < ec_byte_bytes(&buf))
{
fprintf (stderr, "tell() lied, there's %d bytes instead of %d\n",
ec_byte_bytes(&buf), (tell_bits+7)/8);
}
tell_bits -= 8*ec_byte_bytes(&buf);
if (tell_bits > 8)
{
printf ("tell() failed with %d bit offset\n", tell_bits);
return -1;
}
ec_byte_readinit(&buf,ec_byte_get_buffer(&buf),ec_byte_bytes(&buf));
ec_dec_init(&dec,&buf);
for(j=0;j<sz;j++){
sym=ec_dec_uint(&dec,ft);
if(sym!=data[j]){
fprintf(stderr,
"Decoded %i instead of %i with ft of %i at position %i of %i.\n",
sym,data[j],ft,j,sz);
}
}
ec_byte_writeclear(&buf);
free(data);
}
return 0;
}