X-Git-Url: https://git.llucax.com/z.facultad/75.06/emufs.git/blobdiff_plain/558540cc250c19c9617a3f3f12a0f5da38c9c84a..f3a31266bd5ccd4391c104619ec1ebc79b48519f:/emufs/fsc.c?ds=sidebyside

diff --git a/emufs/fsc.c b/emufs/fsc.c
index 0b9449b..95d378a 100644
--- a/emufs/fsc.c
+++ b/emufs/fsc.c
@@ -36,8 +36,10 @@
  */
 
 #include "fsc.h"
-#include <string.h>
+#include "error.h"
 #include <unistd.h>
+#include <sys/types.h>
+#include <string.h>
 
 /* Crea un archivo de Gaps o Espacio Libre en Bloque */
 int emufs_fsc_crear(EMUFS* efs)
@@ -46,7 +48,7 @@ int emufs_fsc_crear(EMUFS* efs)
 }
 
 /* Agrega un registro al archivo de espacio libre en bloque. */
-int emufs_fsc_agregar(EMUFS *emu, EMUFS_BLOCK_ID n_marker, EMUFS_FREE n_freespace)
+int emufs_fsc_agregar(EMUFS *emu, EMUFS_BLOCK_ID marker, EMUFS_FREE freespace)
 {
 	FILE *f_fsc;
 	EMUFS_FSC reg;
@@ -55,135 +57,179 @@ int emufs_fsc_agregar(EMUFS *emu, EMUFS_BLOCK_ID n_marker, EMUFS_FREE n_freespac
 	strcpy(name_f_fsc,emu->nombre);
 	strcat(name_f_fsc, EMUFS_FSC_EXT);
 	
-	/* Cargo el registro */
-	reg.n_marker = n_marker;
-	reg.n_freespace = n_freespace;
-
 	/* Lo guardo en el archivo al final "a+"*/
-	if ( (f_fsc = fopen(name_f_fsc,"a+"))==NULL ) return -1;
+	if ( (f_fsc = fopen(name_f_fsc,"r+"))==NULL ) return -1;
+	/* lo busco.. si esta lo modifico y si no lo agrego */
+	fseek(f_fsc,0,SEEK_SET);
+	while ( !feof(f_fsc) ){
+		if ( fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
+		if ( reg.marker == marker ){
+			fseek(f_fsc,-sizeof(EMUFS_FSC),SEEK_CUR);
+			reg.freespace = freespace;
+			fwrite(&reg,sizeof(EMUFS_FSC),1,f_fsc);
+			fclose(f_fsc);
+			return 0;
+		}
+	}
+	/* Cargo el registro */
+	reg.marker = marker;
+	reg.freespace = freespace;
 	fwrite(&reg,sizeof(EMUFS_FSC),1,f_fsc);
 	fclose(f_fsc);
 	return 0;
 }
 
 /* Agrega un GAP en el archivo de Gaps para Filetype 2 */
-int emufs_fsc_agregar_gap(EMUFS *emu, EMUFS_OFFSET n_marker, EMUFS_FREE n_freespace)
+int emufs_fsc_agregar_gap(EMUFS *emu, EMUFS_OFFSET marker, EMUFS_FREE freespace)
 {
-  	FILE *f_fsc;
+	FILE *f_fsc;
 	EMUFS_FSC gap_aux,gap_before,gap_after,gap_new;
 	char name_f_fsc[255];
-	EMUFS_REG_ID n_gap_before = 0, n_gap_after = 0;
-	unsigned long n_source,n_destination,n_filesize,n_reg_count = 0,n_moved = 0;
-		
+	EMUFS_REG_ID pos_gap_before = 0, pos_gap_after = 0;
+	unsigned long source,destination,limit,file_size,reg_count = 0,cant_moved = 0;
+	char found = 0;
+
 	strcpy(name_f_fsc,emu->nombre);
 	strcat(name_f_fsc, EMUFS_FSC_EXT);
-	
-	gap_before.n_marker = -1;
-	gap_after.n_marker = -1;
-	
+
+	gap_before.marker = -1;
+	gap_after.marker = -1;
+
 	/* Busco si hay un GAP por delante y/o por detras del que se esta por crear */
 	/* para en dicho caso realizar un merge! */
 	if ( (f_fsc = fopen(name_f_fsc,"r+")) == NULL) return -1; 
 	while ( !feof(f_fsc) ){
 		if ( fread(&gap_aux,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
-		
+
 		/* Chequeo si es un gap justo anterior al nuestro */
-		if (gap_aux.n_marker+gap_aux.n_freespace == n_marker) {
-			gap_before.n_marker = gap_aux.n_marker;
-			gap_before.n_freespace = gap_aux.n_freespace;
-			n_gap_before = n_reg_count;
+		if (gap_aux.marker+gap_aux.freespace == marker) {
+			gap_before.marker = gap_aux.marker;
+			gap_before.freespace = gap_aux.freespace;
+			pos_gap_before = reg_count;
 		}
-		
+
 		/* Chequeo si es un gap justo posterior al nuestro */		
-		if (gap_aux.n_marker == n_marker+n_freespace) {
-			gap_after.n_marker = gap_aux.n_marker;
-			gap_after.n_freespace = gap_aux.n_freespace;
-			n_gap_after = n_reg_count;
+		if (gap_aux.marker == marker+freespace) {
+			gap_after.marker = gap_aux.marker;
+			gap_after.freespace = gap_aux.freespace;
+			pos_gap_after = reg_count;
 		}		
-		n_reg_count += 1;
+		reg_count += 1;
 	}
-	
+
 	/* Si no encontre gaps ni por delante ni por detras */
-	if ((gap_before.n_marker == -1) && (gap_after.n_marker == -1)) {
-		/* Lo guardo en el archivo al final */
-		gap_new.n_marker = n_marker;
-		gap_new.n_freespace = n_freespace;
-		fseek(f_fsc,0,SEEK_END);
-		fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
+	if ((gap_before.marker == -1) && (gap_after.marker == -1)) {
+		/* Lo guardo ordenado donde deba ir */
+		gap_new.marker = marker;
+		gap_new.freespace = freespace;
+		/* Busco el gap que sucede a este */
+		fseek(f_fsc,0,SEEK_SET);
+		while (!feof(f_fsc)) {
+			if (fread(&gap_aux,sizeof(EMUFS_FSC),1,f_fsc) != 1) {
+				if (feof(f_fsc)) break;
+				PERR("error al leer archivo fsc");
+			}
+			if (gap_aux.marker > gap_new.marker) {
+				found = 1;
+				break;
+			}
+		}
+		if (found == 1) {
+			/* Movemos todos los gaps desde el sucesor hasta el final, una pos adelante */
+			limit = ftell(f_fsc) - sizeof(EMUFS_FSC);
+			fseek(f_fsc,0,SEEK_END);
+			reg_count = (ftell(f_fsc) - limit) / sizeof(EMUFS_FSC);			
+			source = ftell(f_fsc) - sizeof(EMUFS_FSC);
+
+			while (cant_moved < reg_count)
+			{
+				fseek(f_fsc,source,SEEK_SET);
+				fread(&gap_aux,sizeof(EMUFS_FSC),1,f_fsc);
+				fwrite(&gap_aux,sizeof(EMUFS_FSC),1,f_fsc);
+				source -= sizeof(EMUFS_FSC);
+				++cant_moved;
+			}
+			/* Agrego el nuevo registro */
+			fseek(f_fsc,limit,SEEK_SET);
+			fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
+		}
+		else {
+			fseek(f_fsc,0,SEEK_END);
+			fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
+		}
+
 		fclose(f_fsc);		
 	}
-	
+
 	/* Si encuentro un GAP Justo por delante pero no por detras */
-	if ((gap_before.n_marker != -1) && (gap_after.n_marker == -1))
+	if ((gap_before.marker != -1) && (gap_after.marker == -1))
 	{
-	  printf("fsc.c >> Found GAP justo por Delante pero no por Detras!!\n");
-	  printf("fsc.c >> Gap found is reg number %lu in .fsc file\n",n_gap_before);
-	  /* Me posiciono en el registro que indica dicho gap y lo reescribo con */
-	  /* la suma de los espacios libres */	  
-	  fseek(f_fsc,sizeof(EMUFS_FSC)*n_gap_before,0);
-      gap_new.n_marker = gap_before.n_marker;
-	  gap_new.n_freespace = gap_before.n_freespace + n_freespace;
-	  fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
-	  fclose(f_fsc);
+		/* Me posiciono en el registro que indica dicho gap y lo reescribo con */
+		/* la suma de los espacios libres */	  
+		fseek(f_fsc,sizeof(EMUFS_FSC)*pos_gap_before,0);
+		gap_new.marker = gap_before.marker;
+		gap_new.freespace = gap_before.freespace + freespace;
+		fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
+		fclose(f_fsc);
 	}
-	
+
 	/* Si encuentro un GAP Justo por detras pero no por delante */
-	if ((gap_before.n_marker == -1) && (gap_after.n_marker != -1))
-	{
-	  printf("fsc.c >> Found GAP justo por Detras pero no por Delante!!\n");
-      printf("fsc.c >> Gap found is reg number %lu in .fsc file\n",n_gap_after);		
-	  /* Me posiciono en el registro que indica dicho gap y lo reescribo con */
-	  /* los datos actualizados de offset y espacio */
-	  fseek(f_fsc,sizeof(EMUFS_FSC)*n_gap_after,0);
-      gap_new.n_marker = gap_after.n_marker - n_freespace;
-	  gap_new.n_freespace = gap_after.n_freespace + n_freespace;
-	  fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
-	  fclose(f_fsc);
+	if ((gap_before.marker == -1) && (gap_after.marker != -1))
+	{  
+		/* Me posiciono en el registro que indica dicho gap y lo reescribo con */
+		/* los datos actualizados de offset y espacio */
+		fseek(f_fsc,sizeof(EMUFS_FSC)*pos_gap_after,0);
+		gap_new.marker = gap_after.marker - freespace;
+		gap_new.freespace = gap_after.freespace + freespace;
+		fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
+		fclose(f_fsc);
 	}
-	
+
 	/* Finalmente, si encuentro Justo por delante y por detras..*/
-	if ((gap_before.n_marker != -1) && (gap_after.n_marker != -1))
-	{
-	  printf("fsc.c >> Found GAP justo por Delante y por Detras!!\n");
-	  printf("fsc.c >> Pre Gap found is reg number %lu in .fsc file\n",n_gap_before);	
-	  printf("fsc.c >> Post Gap found is reg number %lu in .fsc file\n",n_gap_after);		
-	  /* Guardo el nuevo GAP que posee los tres espacios sumados */
-	  fseek(f_fsc,sizeof(EMUFS_FSC)*n_gap_before,0);
-      gap_new.n_marker = gap_before.n_marker;
-	  gap_new.n_freespace = gap_before.n_freespace + n_freespace + gap_after.n_freespace;
-	  fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
-		
-	  /* Preparo el escenario para la movida de registros */
-	  n_destination = sizeof(EMUFS_FSC)*n_gap_after;
-	  n_source = n_destination+sizeof(EMUFS_FSC); /* Salteo el gap_after! */
-	  fseek(f_fsc,0,SEEK_END);
-	  n_filesize = ftell(f_fsc);
-	  n_reg_count = (n_filesize - n_source) / sizeof(EMUFS_FSC);
-	  printf("Destination: %lu  Source: %lu  Cant Regs a Mover: %lu\n",n_destination,n_source,n_reg_count);
-		
-	  /* Comienzo a mover */
-	  while (n_moved < n_reg_count) {
-        fseek(f_fsc,n_source,0);
-        fread(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
-		fseek(f_fsc,-sizeof(EMUFS_FSC)*2,SEEK_CUR);
+	if ((gap_before.marker != -1) && (gap_after.marker != -1))
+	{ 
+		/* Guardo el nuevo GAP que posee los tres espacios sumados */
+		if (pos_gap_before < pos_gap_after) {
+			fseek(f_fsc,sizeof(EMUFS_FSC)*pos_gap_before,0);
+			destination = sizeof(EMUFS_FSC)*pos_gap_after;
+		}
+		else {
+			fseek(f_fsc,sizeof(EMUFS_FSC)*pos_gap_after,0);
+			destination = sizeof(EMUFS_FSC)*pos_gap_before;
+		}
+		gap_new.marker = gap_before.marker;
+		gap_new.freespace = gap_before.freespace + freespace + gap_after.freespace;
 		fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
-		n_source += sizeof(EMUFS_FSC);		
-		++n_moved;
-	  }
-	  fclose(f_fsc);
-	  truncate(name_f_fsc, n_filesize - sizeof(EMUFS_FSC));	
+
+		/* Preparo el escenario para la movida de registros */
+		source = destination+sizeof(EMUFS_FSC); /* Salteo el gap que elimino! */
+		fseek(f_fsc,0,SEEK_END);
+		file_size = ftell(f_fsc);
+		reg_count = (file_size - source) / sizeof(EMUFS_FSC);
+
+		/* Comienzo a mover */
+		while (cant_moved < reg_count) {
+			fseek(f_fsc,source,0);
+			fread(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
+			fseek(f_fsc,-sizeof(EMUFS_FSC)*2,SEEK_CUR);
+			fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
+			source += sizeof(EMUFS_FSC);		
+			++cant_moved;
+		}
+		fclose(f_fsc);
+		truncate(name_f_fsc, file_size - sizeof(EMUFS_FSC));
 	}	
-	
+
     return 0;
 }
 
 /* Elimina un registro GAP del archivo de espacios libres (gaps) */
-int emufs_fsc_remove_gap(EMUFS *emu, EMUFS_OFFSET n_marker)
+int emufs_fsc_remove_gap(EMUFS *emu, EMUFS_OFFSET marker)
 {
   	FILE *f_fsc;
 	EMUFS_FSC gap_aux;
 	char name_f_fsc[255];
-    unsigned long n_source,n_destination,n_filesize,n_reg_count = 0,n_moved = 0;	
+    unsigned long source,destination,file_size,reg_count = 0,cant_moved = 0;	
 		
 	strcpy(name_f_fsc,emu->nombre);
 	strcat(name_f_fsc, EMUFS_FSC_EXT);
@@ -192,35 +238,34 @@ int emufs_fsc_remove_gap(EMUFS *emu, EMUFS_OFFSET n_marker)
     if ((f_fsc = fopen(name_f_fsc,"r+")) == NULL) return -1; 
 	while ( !feof(f_fsc) ){
 		if ( fread(&gap_aux,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
-		if ( gap_aux.n_marker == n_marker ) break;
+		if ( gap_aux.marker == marker ) break;
 	}
 	
 	/* Preparo el escenario para la movida de registros */
 	fseek(f_fsc,-sizeof(EMUFS_FSC),SEEK_CUR);
-	n_destination = ftell(f_fsc);
-	n_source = n_destination+sizeof(EMUFS_FSC); /* Salteo el gap a eliminar! */
+	destination = ftell(f_fsc);
+	source = destination+sizeof(EMUFS_FSC); /* Salteo el gap a eliminar! */
 	fseek(f_fsc,0,SEEK_END);
-	n_filesize = ftell(f_fsc);
-	n_reg_count = (n_filesize - n_source) / sizeof(EMUFS_FSC);
-	printf("Destination: %lu  Source: %lu  Cant Regs a Mover: %lu\n",n_destination,n_source,n_reg_count);
+	file_size = ftell(f_fsc);
+	reg_count = (file_size - source) / sizeof(EMUFS_FSC);
 		
 	/* Comienzo a mover */
-	while (n_moved < n_reg_count) {
-	  fseek(f_fsc,n_source,0);
+	while (cant_moved < reg_count) {
+	  fseek(f_fsc,source,0);
       fread(&gap_aux,sizeof(EMUFS_FSC),1,f_fsc);
 	  fseek(f_fsc,-sizeof(EMUFS_FSC)*2,SEEK_CUR);
 	  fwrite(&gap_aux,sizeof(EMUFS_FSC),1,f_fsc);
-	  n_source += sizeof(EMUFS_FSC);		
-	  ++n_moved;
+	  source += sizeof(EMUFS_FSC);		
+	  ++cant_moved;
 	}
 	fclose(f_fsc);
-	truncate(name_f_fsc, n_filesize - sizeof(EMUFS_FSC));
+	truncate(name_f_fsc, file_size - sizeof(EMUFS_FSC));
 	
 	return 0;
 }
 
 /* Objetivo: Actualiza un registro de espacio libre de acorde al FType */
-int emufs_fsc_actualizar(EMUFS *emu, EMUFS_BLOCK_ID n_marker, EMUFS_FREE n_freespace)
+int emufs_fsc_actualizar(EMUFS *emu, EMUFS_BLOCK_ID marker, EMUFS_FREE freespace)
 {
 	FILE *f_fsc;
 	EMUFS_FSC reg;
@@ -233,8 +278,8 @@ int emufs_fsc_actualizar(EMUFS *emu, EMUFS_BLOCK_ID n_marker, EMUFS_FREE n_frees
 	if ( (f_fsc = fopen(name_f_fsc,"r+")) == NULL) return -1; 
 	while ( !feof(f_fsc) ){
 		if ( fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
-		if ( reg.n_marker == n_marker ){
-			reg.n_freespace = n_freespace;
+		if ( reg.marker == marker ){
+			reg.freespace = freespace;
 			fseek(f_fsc,-sizeof(EMUFS_FSC),SEEK_CUR);
 			fwrite(&reg,sizeof(EMUFS_FSC),1,f_fsc);
 			break;
@@ -245,7 +290,7 @@ int emufs_fsc_actualizar(EMUFS *emu, EMUFS_BLOCK_ID n_marker, EMUFS_FREE n_frees
 }
 
 /* Actualiza un registro de gap, en el archivo de Gaps en Disco */
-int emufs_fsc_actualizar_gap(EMUFS *emu, EMUFS_OFFSET n_marker, EMUFS_FREE n_freespace)
+int emufs_fsc_actualizar_gap(EMUFS *emu, EMUFS_OFFSET marker, EMUFS_FREE freespace)
 {
 	FILE *f_fsc;
 	EMUFS_FSC gap_aux;
@@ -258,9 +303,9 @@ int emufs_fsc_actualizar_gap(EMUFS *emu, EMUFS_OFFSET n_marker, EMUFS_FREE n_fre
 	if ( (f_fsc = fopen(name_f_fsc,"r+")) == NULL) return -1; 
 	while ( !feof(f_fsc) ){
 		if ( fread(&gap_aux,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
-		if ( gap_aux.n_marker == n_marker ){
-			gap_aux.n_marker = n_marker + gap_aux.n_freespace - n_freespace;
-			gap_aux.n_freespace = n_freespace;
+		if ( gap_aux.marker == marker ){
+			gap_aux.marker = marker + gap_aux.freespace - freespace;
+			gap_aux.freespace = freespace;
 			fseek(f_fsc,-sizeof(EMUFS_FSC),SEEK_CUR);
 			fwrite(&gap_aux,sizeof(EMUFS_FSC),1,f_fsc);
 			break;
@@ -271,7 +316,7 @@ int emufs_fsc_actualizar_gap(EMUFS *emu, EMUFS_OFFSET n_marker, EMUFS_FREE n_fre
 }
 
 /* Me devuelve el ID del bloque u Offset del Gap donde quepa un registro, y guarda en n_freespace el espacio libre actualizado */
-EMUFS_BLOCK_ID emufs_fsc_buscar_lugar(EMUFS *emu, EMUFS_FREE n_regsize, EMUFS_FREE *n_freespace)
+EMUFS_BLOCK_ID emufs_fsc_buscar_lugar(EMUFS *emu, EMUFS_FREE reg_size, EMUFS_FREE *freespace)
 {
 	FILE *f_fsc;
 	EMUFS_FSC reg;
@@ -283,11 +328,22 @@ EMUFS_BLOCK_ID emufs_fsc_buscar_lugar(EMUFS *emu, EMUFS_FREE n_regsize, EMUFS_FR
 
 	if ( (f_fsc = fopen(name_f_fsc,"r"))==NULL ) return EMUFS_NOT_FOUND;
 
+	if ( emu->tam_reg > emu->tam_bloque-sizeof(EMUFS_REG_ID) ){
+		fseek(f_fsc,0,SEEK_SET);
+		while(!feof(f_fsc)){
+			if (fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
+			if (reg.freespace == emu->tam_bloque) {
+				fclose(f_fsc);
+				*freespace = reg.freespace;
+				return reg.marker;
+			}
+		}
+	}	
 	/* Inicializamos la estructura para devolver algun valor en concreto */
 	/* en caso de que no se halle un espacio libre apropiado */
 	while(!feof(f_fsc)){
 		if (fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
-		if (reg.n_freespace >= n_regsize) {
+		if (reg.freespace >= reg_size) {
 			found = 1;
 			break;
 		}
@@ -295,17 +351,77 @@ EMUFS_BLOCK_ID emufs_fsc_buscar_lugar(EMUFS *emu, EMUFS_FREE n_regsize, EMUFS_FR
 	
 	/* Si salio por error o por fin de archivo y no encontro space... */
 	if (!found) {
-	  reg.n_marker = EMUFS_NOT_FOUND;
-	  *n_freespace = emu->tam_bloque; 
+	  reg.marker = EMUFS_NOT_FOUND;
+	  *freespace = emu->tam_bloque; 
 	}
-	else *n_freespace = reg.n_freespace;
+	else *freespace = reg.freespace;
 	
 	fclose(f_fsc);
-	return reg.n_marker;
+	return reg.marker;
+}
+
+/** Busca n lugares consecutivos devolviendo el id del primer bloque. */
+EMUFS_BLOCK_ID emufs_fsc_buscar_n_lugares(EMUFS* efs, size_t n,
+		EMUFS_FREE reg_size, EMUFS_FREE *freespace, int* err)
+{
+	FILE *f_fsc;
+	EMUFS_FSC reg;
+	char name_f_fsc[255];
+
+	/* chequeo que al menos se busque un lugar */
+	if (!n) {
+		PERR("Se debe buscar al menos un lugar");
+		*err = EMUFS_ERROR_WRONG_ARGUMENT;
+		return EMUFS_NOT_FOUND;
+	}
+
+	/* abre archivo */
+	strcpy(name_f_fsc, efs->nombre);
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
+	if (!(f_fsc = fopen(name_f_fsc, "rb"))) {
+		PERR("No se puede abrir archivo");
+		*err = EMUFS_ERROR_CANT_OPEN_FILE;
+		return EMUFS_NOT_FOUND;
+	}
+
+	/* busca el espacio libre */
+	while(!feof(f_fsc)) {
+		if ((fread(&reg, sizeof(EMUFS_FSC), 1, f_fsc) != 1)) {
+			if (feof(f_fsc)) break;
+			PERR("No se puede leer el archivo");
+			*err = EMUFS_ERROR_FILE_READ;
+			return EMUFS_NOT_FOUND;
+		}
+		if (reg.freespace >= reg_size) {
+			int found = 1;
+			EMUFS_BLOCK_ID first_id = reg.marker;
+			*freespace = reg.freespace;
+			while (--n) {
+				if (fread(&reg, sizeof(EMUFS_FSC), 1, f_fsc) != 1) {
+					if (feof(f_fsc)) break;
+					PERR("No se puede leer el archivo");
+					*err = EMUFS_ERROR_FILE_READ;
+					return EMUFS_NOT_FOUND;
+				}
+				/* no hay otro lugar consecutivo */
+				if (reg.freespace < reg_size) {
+					found = 0;
+					break;
+				}
+			}
+			if (found) {
+				fclose(f_fsc);
+				return first_id;
+			}
+		}
+	}
+	/* no se encontró espacio libre */
+	*freespace = efs->tam_bloque;
+	return EMUFS_NOT_FOUND;
 }
 
 /* Devuelve el espacio libre de un Bloque o Gap dado */
-EMUFS_FREE emufs_fsc_get_fs(EMUFS *emu, EMUFS_BLOCK_ID n_marker)
+EMUFS_FREE emufs_fsc_get_fs(EMUFS *emu, EMUFS_BLOCK_ID marker)
 {
 	FILE *f_fsc;
 	EMUFS_FSC reg;
@@ -318,12 +434,12 @@ EMUFS_FREE emufs_fsc_get_fs(EMUFS *emu, EMUFS_BLOCK_ID n_marker)
 	if ( (f_fsc = fopen(name_f_fsc,"r"))==NULL ) return -1;
 	while ( !feof(f_fsc) ){
 		if ( fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1 ) continue;
-		if ( reg.n_marker == n_marker )
+		if ( reg.marker == marker )
 			break;
 	}
 		
 	fclose(f_fsc);
-	return reg.n_freespace;
+	return reg.freespace;
 }
 
 EMUFS_FREE emufs_fsc_get_total_fs(EMUFS *emu)
@@ -340,8 +456,118 @@ EMUFS_FREE emufs_fsc_get_total_fs(EMUFS *emu)
 	total = 0;
 	while ( !feof(f_fsc) ){
 		if ( fread(&reg, sizeof(EMUFS_FSC), 1, f_fsc) != 1) continue;
-		total += reg.n_freespace;
+		total += reg.freespace;
 	}
 	fclose(f_fsc);
 	return total;
 }
+
+int emufs_fsc_get_max_min_fs(EMUFS *emu, EMUFS_FREE *min, EMUFS_FREE *max)
+{
+	FILE *f_fsc;
+	EMUFS_FSC reg;
+	char name_f_fsc[255];
+	
+	strcpy(name_f_fsc,emu->nombre);
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
+
+	if ( (f_fsc = fopen(name_f_fsc,"r"))==NULL ) return -1;
+		
+	/* Si el file esta vacio, devuelvo valores nulos */
+	fseek(f_fsc,0,SEEK_END);
+	if (ftell(f_fsc) == 0) {
+		*min = 0;
+		*max = 0;
+		return 0;		
+	}
+	else
+	{
+		/* Busco Min y Max */
+		*min = ULONG_MAX;
+		*max = 0;		
+		fseek(f_fsc,0,SEEK_SET);		
+		while ( !feof(f_fsc) ){
+			if ( fread(&reg, sizeof(EMUFS_FSC), 1, f_fsc) != 1) continue;
+			if (  reg.freespace < *min )
+				*min = reg.freespace;
+			if ( reg.freespace > *max )
+				*max = reg.freespace;
+		}
+		fclose(f_fsc);
+		return 0;		
+	}
+}
+
+EMUFS_FREE emufs_fsc_get_media_fs(EMUFS *emu)
+{
+	FILE *f_fsc;
+	EMUFS_FSC reg;
+	char name_f_fsc[255];
+	EMUFS_FREE total_fs = 0;
+	EMUFS_REG_ID gap_count = 0;
+	
+	strcpy(name_f_fsc,emu->nombre);
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
+
+	if ( (f_fsc = fopen(name_f_fsc,"r"))==NULL ) return -1;
+	
+	while ( !feof(f_fsc) ){
+		if ( fread(&reg, sizeof(EMUFS_FSC), 1, f_fsc) != 1) continue;		
+		total_fs += reg.freespace;
+		++gap_count;
+	}
+
+	fclose(f_fsc);
+	
+	if (gap_count > 0) return total_fs/gap_count;
+	else return 0;
+}
+
+EMUFS_BLOCK_ID emufs_fsc_get_cant_bloques_vacios(EMUFS *emu)
+{
+	FILE *f_fsc;
+	EMUFS_FSC reg;
+	char name_f_fsc[255];
+	EMUFS_BLOCK_ID cant=0;
+	
+	strcpy(name_f_fsc,emu->nombre);
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
+
+	if ( (f_fsc = fopen(name_f_fsc,"r"))==NULL ) return -1;
+	while ( !feof(f_fsc) ){
+		fread(&reg, sizeof(EMUFS_FSC), 1, f_fsc);
+		if ( reg.freespace == emu->tam_bloque )
+			cant++;
+	}
+		
+	fclose(f_fsc);
+	return cant;
+}
+
+int emufs_fsc_truncate(EMUFS* efs, EMUFS_BLOCK_ID blocks)
+{
+	char name_f_fsc[255];
+
+	strcpy(name_f_fsc, efs->nombre);
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
+	return truncate(name_f_fsc, blocks * sizeof(EMUFS_FSC));
+}
+
+EMUFS_BLOCK_ID emufs_fsc_get_num_blocks(EMUFS* efs)
+{
+	FILE *f_fsc;
+	char name_f_fsc[255];
+	EMUFS_BLOCK_ID cant = 0;
+	
+	strcpy(name_f_fsc, efs->nombre);
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
+
+	if (!(f_fsc = fopen(name_f_fsc, "ab"))) {
+		PERR("error al abrir archivo .fsc");
+		return EMUFS_NOT_FOUND;
+	}
+	cant = ftell(f_fsc) / sizeof(EMUFS_FSC);
+	fclose(f_fsc);
+	return cant;
+}
+