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