Se mueve la lectura del bloque a BS, que ahora le voy a meter una optimizacion para

[z.facultad/75.06/jacu.git] / src / blocksorting / bs.c

diff --git a/src/blocksorting/bs.c b/src/blocksorting/bs.c
index 9463b433401793f92ec978484180e3d5942e0590..93b7bb55c5395bdc082f5ba939c97d988b0938c3 100644 (file)
--- a/src/blocksorting/bs.c
+++ b/src/blocksorting/bs.c
@@ -6,7 +6,7 @@
 
 typedef struct _bs_decode_t_ {
        char c;
-       unsigned long int pos;
+       Uint32 sig;
 } t_BlockSortDecode;
 
 char es_menor(char *data, t_BlockSort *bs, int i, int j);
@@ -17,6 +17,11 @@ int _compare(const void *d1, const void *d2) {
        s1 = (t_BlockSortDecode *)d1;
        s2 = (t_BlockSortDecode *)d2;
 
+       /* Hack si es el mismo caracter, dejo como mejor la de menor sig */
+       if (s1->c == s2->c) {
+               return (s1->sig - s2->sig);
+       }
+
        return (s1->c - s2->c);
 }
 
@@ -26,12 +31,12 @@ int __compare(const void *d1, const void *d2) {
        s1 = (t_BlockSortData *)d1;
        s2 = (t_BlockSortData *)d2;
 
-       return es_menor(s1->bs->data, s1->bs, s1->pos_inicial, s2->pos_inicial);
+       return  es_menor(s1->bs->data, s1->bs, s1->pos_inicial, s2->pos_inicial);
 }
 
 char es_menor(char *data, t_BlockSort *bs, int i, int j)
 {
-       unsigned long int pi, pj, k;
+       Uint32 pi, pj, k;
 
        for(k=0; k<bs->len; k++) {
                pi = (i+k)%bs->len;
@@ -61,33 +66,23 @@ void ordenar_array(char *data, t_BlockSort *bs)
        qsort(bs->array, bs->len, sizeof(t_BlockSortData), __compare);
 }
 
-void print_(char *data, unsigned long int pos, unsigned long int len)
-{
-       unsigned long int i;
-
-       for(i=0; i<len; i++)
-               printf("%c", data[(pos+i)%len]);
-       printf("\n");
-}
-
 int generar_salida(char *data, t_BlockSort *bs, char *salida)
 {
-       unsigned long int i, k;
+       Uint32 i, k;
        char *out;
 
-       /* Dejo lugar para guardar el k y el tamaño de este bloque */
-       out = salida + sizeof(unsigned long int)*2;
+       /* Dejo lugar para guardar el K */
+       out = salida + sizeof(Uint32);
 
        k=-1;
        for(i=0; i<bs->len; i++) {
-               /* print_(data, bs->array[i].pos_inicial, bs->len); */
                out[i] = data[bs->array[i].pos_final];
                if (bs->array[i].ord == 1) k = i;
        }
        return k;
 }
 
-void bs_solve(char *in, char *out, t_BlockSort *bs, unsigned long int *k, unsigned int leido)
+void bs_solve(char *in, char *out, t_BlockSort *bs, Uint32 *k, Uint32 leido)
 {
        unsigned int l;
        l = bs->len;
@@ -99,23 +94,21 @@ void bs_solve(char *in, char *out, t_BlockSort *bs, unsigned long int *k, unsign
        ordenar_array(in, bs);
        (*k) = generar_salida(in, bs, out);
 
-       /* Guardo el k y el tamaño en el array */
-       memcpy(out, &leido, sizeof(unsigned long int));
-       memcpy(out+sizeof(unsigned long int), k, sizeof(unsigned long int));
-
+       /* Guardo el k y el tamaño en el array */       
+       memcpy(out, k, sizeof(Uint32));
        bs->len = l;
 }
 
-void bs_restore(char *dst, char *c, unsigned long int k, unsigned long int len)
+void bs_restore(char *dst, char *c, Uint32 k, Uint32 len)
 {
-       unsigned long int i, current;
+       Uint32 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;
+               in[i].sig = i;
        }
 
        qsort(in, len, sizeof(t_BlockSortDecode), _compare);
@@ -124,12 +117,12 @@ void bs_restore(char *dst, char *c, unsigned long int k, unsigned long int len)
        i=0;
        do {
                dst[i++] = in[current].c;
-               current = in[current].pos;
+               current = in[current].sig;
        } while (current != k);
        free(in);
 }
 
-t_BlockSort *bs_create(unsigned long int len)
+t_BlockSort *bs_create(Uint32 len)
 {
        t_BlockSort *tmp;
 
@@ -147,3 +140,17 @@ void bs_destroy(t_BlockSort *bs)
        free(bs);
 }
 
+int bs_readblock(FILE *fp, char *data, Uint32 pagesize)
+{
+       Uint32 i=0;
+
+       while ((!feof(fp)) && (i < pagesize)) {
+               data[i++] = fgetc(fp);
+       }
+
+       /* Saco un EOF que lee de mas */
+       if (i<pagesize) i--;
+
+       return i;
+}
+