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#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
/* convert a hex string to an array of ints */
int*
hex_to_array(str)
char* str;
{
int *a;
int i, j, n, v;
n = strlen(str) / 8;
New(0, a, n, int);
for (i = 0; i < n; i++) {
v = 0;
for (j = 0; j < 8; j++) {
v = v << 4;
if (str[i*8 + j] >= 'a') {
v = v + str[i*8 + j] - 'a' + 10;
} else {
v = v + str[i*8 + j] - '0';
}
}
a[i] = v;
}
return(a);
}
/* Pack an array of ints into a hex string */
char*
array_to_hex(a, n)
int* a;
int n;
{
char *res;
char s[9];
int i;
New(0, res, n * 8 + 1, char);
res[0] = 0;
for (i = 0; i < n; i++) {
sprintf(s, "%08x", a[i]);
strcat(res, s);
}
return(res);
}
char*
reflow_trial(optimum_c, maximum, wordcount,
penaltylimit, semantic, shortlast,
word_len_c, space_len_c, extra_c,
result)
int maximum, wordcount, penaltylimit, semantic, shortlast;
char *optimum_c, *word_len_c, *space_len_c, *extra_c;
char *result;
{
int *optimum, *word_len, *space_len, *extra;
int *linkbreak, *totalpenalty, *best_linkbreak;
int lastbreak, i, j, k, interval, penalty, bestsofar;
int best_lastbreak, opt;
char *best_linkbreak_c;
int opts, ii, count;
int best = penaltylimit * 21;
optimum = hex_to_array(optimum_c);
word_len = hex_to_array(word_len_c);
space_len = hex_to_array(space_len_c);
extra = hex_to_array(extra_c);
count = wordcount * sizeof(int);
New(0, linkbreak, count, int);
New(0, totalpenalty, count, int);
New(0, best_linkbreak, count, int);
/* Keep gcc -Wall happy: */
best_lastbreak = 0;
/* size of optimum array: */
opts = strlen(optimum_c) / 8;
for (i = 0; i < opts; i++) {
opt = optimum[i];
for (j = 0; j < wordcount; j++) {
interval = 0;
totalpenalty[j] = penaltylimit * 2;
for (k = j; k >= 0; k--) {
interval += word_len[k];
if ((k < j) && ((interval > opt + 10)
|| (interval >= maximum))) {
break;
}
penalty = (interval - opt) * (interval - opt);
interval += space_len[k];
if (k > 0) {
penalty += totalpenalty[k-1];
}
penalty -= (extra[j] * semantic)/2;
if (penalty < totalpenalty[j]) {
totalpenalty[j] = penalty;
linkbreak[j] = k-1;
}
}
}
interval = 0;
bestsofar = penaltylimit * 20;
lastbreak = wordcount-2;
/* Pick a break for the last line which gives */
/* the least penalties for previous lines: */
for (k = wordcount-2; k >= -1; k--) {
interval += word_len[k+1];
if ((interval > opt + 10) || (interval > maximum)) {
break;
}
if (interval > opt) {
penalty = (interval - opt) * (interval - opt);
} else {
penalty = 0;
}
interval += space_len[k+1];
if (k >= 0) {
penalty += totalpenalty[k];
}
if (wordcount - k - 1 <= 2) {
penalty += shortlast * semantic;
}
if (penalty <= bestsofar) {
bestsofar = penalty;
lastbreak = k;
}
}
/* Save these breaks if they are an improvement: */
if (bestsofar < best) {
best_lastbreak = lastbreak;
for (ii = 0; ii < wordcount; ii++) {
best_linkbreak[ii] = linkbreak[ii];
}
best = bestsofar;
}
}
/* Return the best breaks, */
/* ie return the array ($best_lastbreak, @best_linkbreak) as a hex string */
best_linkbreak_c = array_to_hex(best_linkbreak, wordcount);
sprintf(result, "%08x", best_lastbreak);
strcat(result, best_linkbreak_c);
Safefree(optimum);
Safefree(word_len);
Safefree(space_len);
Safefree(extra);
Safefree(linkbreak);
Safefree(totalpenalty);
Safefree(best_linkbreak);
Safefree(best_linkbreak_c);
return(result);
}
MODULE = Text::Reflow PACKAGE = Text::Reflow
char *
reflow_trial(optimum, maximum, wordcount, \
penaltylimit, semantic, shortlast, \
word_len, space_len, extra, result)
int maximum
int wordcount
int penaltylimit
int semantic
int shortlast
char* optimum
char* word_len
char* space_len
char* extra
char* result
PROTOTYPE: $$$$$$$$$$
OUTPUT:
result
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