From 79c3f2200fb945762a764093f545ce61edf691c8 Mon Sep 17 00:00:00 2001
From: Ricardo Markiewicz <gazer.arg@gmail.com>
Date: Sat, 19 Jun 2004 21:05:00 +0000
Subject: [PATCH]  * Agrego bs_restore para rehacer el array original.

---
 otros/blocksorting/bs.c | 43 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

diff --git a/otros/blocksorting/bs.c b/otros/blocksorting/bs.c
index 61dfb78..13b7824 100644
--- a/otros/blocksorting/bs.c
+++ b/otros/blocksorting/bs.c
@@ -18,6 +18,20 @@ typedef struct _bs_t_ {
 	unsigned long int len;
 } t_BlockSort;
 
+typedef struct _bs_decode_t_ {
+	char c;
+	unsigned long int pos;
+} t_BlockSortDecode;
+
+int _compare(const void *d1, const void *d2) {
+	t_BlockSortDecode *s1, *s2;
+
+	s1 = (t_BlockSortDecode *)d1;
+	s2 = (t_BlockSortDecode *)d2;
+
+	return (s1->c - s2->c);
+}
+
 char es_menor(char *data, t_BlockSort *bs, int i, int j)
 {
 	unsigned long int pi, pj, k;
@@ -88,6 +102,29 @@ void bs_solve(char *in, char *out, t_BlockSort *bs, unsigned long int *k, unsign
 	bs->len = l;
 }
 
+void bs_restore(char *dst, char *c, unsigned long int k, unsigned long int len)
+{
+	unsigned long int i, current;
+	t_BlockSortDecode *in;
+
+	in = malloc(sizeof(t_BlockSortDecode)*len);
+
+	for(i=0; i<len; i++) {
+		in[i].c = c[i];
+		in[i].pos = i;
+	}
+
+	qsort(in, len, sizeof(t_BlockSortDecode), _compare);
+	
+	current = k;
+	i=0;
+	do {
+		dst[i++] = in[current].c;
+		current = in[current].pos;
+	} while (current != k);
+	free(in);
+}
+
 t_BlockSort *bs_create(unsigned int len)
 {
 	t_BlockSort *tmp;
@@ -116,7 +153,7 @@ int main(int argc, char *argv[])
 	FILE *fp;
 	char c;
 	t_BlockSort *bs;
-
+	
 	if (argc != 3) {
 		printf("Modo de uso : %s <archivo datos> <tamaño pagina>\n", argv[0]);
 		return 0;
@@ -126,8 +163,9 @@ int main(int argc, char *argv[])
 	len = atoi(argv[2]);
 
 	data = malloc(sizeof(char)*len);
-	salida = malloc(sizeof(char)*len);
+	salida = malloc(sizeof(char)*(len+1));
 
+	salida[len] = '\0';
 	bs = bs_create(len);
 
 	while ((c = fgetc(fp)) != EOF) {
@@ -139,6 +177,7 @@ int main(int argc, char *argv[])
 		bs_solve(data, salida, bs, &k, i);
 
 		/* XXX ACA SALIDA DEBERIA PASAR A LA SIGUIENTE ETAPA XXX */
+		printf("%s -> %ld\n", salida, k);
 	}
 	fclose(fp);
 	bs_destroy(bs);
-- 
2.43.0