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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "fileutils.h"
char * dte_text;
char dte_flags[256 * 256];
long dte_counters[256 * 256];
long dte_most;
long dte_counter;
long dte_text_size;
int dte_size;
long gain;
#ifdef USEASM
extern "C" {
void build_dte(void);
void dte_reset(void);
}
#else
void dte_reset(void) {
memset(dte_counters, 0, 0x40000);
dte_most = 0;
dte_counter = 0;
}
void build_dte(void) {
int i;
unsigned short t;
for (i = 0; i < dte_text_size; i++) {
t = *((unsigned short *) (dte_text + i));
if (!dte_flags[t]) {
if ((++dte_counters[t]) > dte_counter) {
dte_most = t;
dte_counter = dte_counters[t];
}
}
}
}
#endif
void dte_compress(char alloweds[]) {
int i, j;
char c1, c2;
for (i = 0; i < 256; i++) {
for (j = 0; j < 256; j++) {
dte_flags[i * 256 + j] = alloweds[i] ? alloweds[j] ? 0 : 1 : 1;
}
}
gain = 0;
fprintf(stderr, "Going for it: dte_size = %i\n", dte_size);
for (i = 0; i < dte_size; i++) {
dte_reset();
build_dte();
c1 = dte_most & 0xff;
c2 = dte_most >> 8;
fprintf(stderr, "Entry #%i, most count: %li, couple = 0x%04x = (%c %c)\n", i, dte_counter, (int) dte_most, c1, c2);
dte_flags[c1 + c2 * 256] = 1;
gain += dte_counter;
}
fprintf(stderr, "Total gain: %li bytes\n", gain);
}
#ifdef DTEMAIN
int main(int argc, char ** argv) {
int i;
FILE * f;
char alloweds[256];
dte_size = 128;
f = fopen(argv[1], "r");
dte_text_size = filesize(f);
dte_text = (char *) calloc(dte_text_size + 4, 1);
fprintf(stderr, "Reading file, size = %li\n", dte_text_size);
fread(dte_text, 1, dte_text_size, f);
fclose(f);
memset(alloweds, 0, 256);
fprintf(stderr, "Building alloweds table\n");
for (i = 0; i < dte_text_size; i++) {
if ((dte_text[i] != '\n') && (dte_text[i] != '\r')) {
alloweds[dte_text[i]] = 1;
}
}
dte_compress(alloweds);
free(dte_text);
}
#endif
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