X-Git-Url: https://git.llucax.com/z.facultad/75.06/emufs.git/blobdiff_plain/c407055e1cc6ff4c435114091c3a5430486aa659..5c39a8b8061f2ae5c22a12e40d1b9f4ffea42c68:/emufs/fsc.c?ds=inline

diff --git a/emufs/fsc.c b/emufs/fsc.c
index 1cf873f..4c5008a 100644
--- a/emufs/fsc.c
+++ b/emufs/fsc.c
@@ -45,8 +45,8 @@ int emufs_fsc_crear(EMUFS* efs)
 	return emufs_crear_archivo_auxiliar(efs->nombre, EMUFS_FSC_EXT);
 }
 
-/* Agrega un registro al archivo de espacios libres. */
-int emufs_fsc_agregar(EMUFS *emu, EMUFS_BLOCK_ID n_Marker, EMUFS_FREE n_FreeSpace)
+/* Agrega un registro al archivo de espacio libre en bloque. */
+int emufs_fsc_agregar(EMUFS *emu, EMUFS_BLOCK_ID marker, EMUFS_FREE freespace)
 {
 	FILE *f_fsc;
 	EMUFS_FSC reg;
@@ -55,19 +55,180 @@ 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 marker, EMUFS_FREE freespace)
+{
+  	FILE *f_fsc;
+	EMUFS_FSC gap_aux,gap_before,gap_after,gap_new;
+	char name_f_fsc[255];
+	EMUFS_REG_ID pos_gap_before = 0, pos_gap_after = 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);
+	
+	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.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.marker == marker+freespace) {
+			gap_after.marker = gap_aux.marker;
+			gap_after.freespace = gap_aux.freespace;
+			pos_gap_after = reg_count;
+		}		
+		reg_count += 1;
+	}
+	
+	/* Si no encontre gaps ni por delante ni por detras */
+	if ((gap_before.marker == -1) && (gap_after.marker == -1)) {
+		/* Lo guardo en el archivo al final */
+		gap_new.marker = marker;
+		gap_new.freespace = freespace;
+		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.marker != -1) && (gap_after.marker == -1))
+	{
+	  /* 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.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.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);
+		
+	  /* 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 marker)
+{
+  	FILE *f_fsc;
+	EMUFS_FSC gap_aux;
+	char name_f_fsc[255];
+    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);
+	
+	/* Busco el Gap en el .fsc */
+    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.marker == marker ) break;
+	}
+	
+	/* Preparo el escenario para la movida de registros */
+	fseek(f_fsc,-sizeof(EMUFS_FSC),SEEK_CUR);
+	destination = ftell(f_fsc);
+	source = destination+sizeof(EMUFS_FSC); /* Salteo el gap a eliminar! */
+	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_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);
+	  source += sizeof(EMUFS_FSC);		
+	  ++cant_moved;
+	}
+	fclose(f_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;
@@ -77,11 +238,11 @@ int emufs_fsc_actualizar(EMUFS *emu, EMUFS_BLOCK_ID n_Marker, EMUFS_FREE n_FreeS
 	strcat(name_f_fsc, EMUFS_FSC_EXT);
 
 	/*busco el bloque o gap que modifique*/
-    if ( (f_fsc = fopen(name_f_fsc,"r+")) == NULL) return -1; 
+	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;
@@ -91,39 +252,79 @@ int emufs_fsc_actualizar(EMUFS *emu, EMUFS_BLOCK_ID n_Marker, EMUFS_FREE n_FreeS
 	return 0;
 }
 
-/* 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)
+/* Actualiza un registro de gap, en el archivo de Gaps en Disco */
+int emufs_fsc_actualizar_gap(EMUFS *emu, EMUFS_OFFSET marker, EMUFS_FREE freespace)
+{
+	FILE *f_fsc;
+	EMUFS_FSC gap_aux;
+	char name_f_fsc[255];
+	
+	strcpy(name_f_fsc,emu->nombre);
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
+
+	/*busco el bloque o gap que modifique*/
+	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.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;
+		}
+	}
+	fclose(f_fsc);
+	return 0;
+}
+
+/* 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 reg_size, EMUFS_FREE *freespace)
 {
 	FILE *f_fsc;
 	EMUFS_FSC reg;
 	char name_f_fsc[255];
-	unsigned short int b_Found = 0;
+	char found = 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;
+	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) && !b_Found){
+	while(!feof(f_fsc)){
 		if (fread(&reg,sizeof(EMUFS_FSC),1,f_fsc) != 1) continue;
-		if (reg.n_FreeSpace >= n_RegSize) b_Found = 1;
+		if (reg.freespace >= reg_size) {
+			found = 1;
+			break;
+		}
 	}
 	
 	/* Si salio por error o por fin de archivo y no encontro space... */
-	if (!b_Found) {
-	  reg.n_Marker = -1;
-	  *n_FreeSpace = emu->tam_bloque; 
+	if (!found) {
+	  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;
 }
 
 /* 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;
@@ -136,10 +337,108 @@ 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)
+{
+	FILE *f_fsc;
+	EMUFS_FSC reg;
+	char name_f_fsc[255];
+	EMUFS_FREE total;
+	
+	strcpy(name_f_fsc,emu->nombre);
+	strcat(name_f_fsc, EMUFS_FSC_EXT);
+
+	if ( (f_fsc = fopen(name_f_fsc,"r"))==NULL ) return -1;
+	total = 0;
+	while ( !feof(f_fsc) ){
+		if ( fread(&reg, sizeof(EMUFS_FSC), 1, f_fsc) != 1) continue;
+		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);
+
+	*min = ULONG_MAX;
+	*max = 0;
+	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 < *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) ){
+		fread(&reg, sizeof(EMUFS_FSC), 1, f_fsc);
+		total_fs += reg.freespace;
+		++gap_count;
+	}
+
+	fclose(f_fsc);
+	return total_fs/gap_count;
+}
+
+int emufs_fsc_get_cant_bloques_vacios(EMUFS *emu)
+{
+	FILE *f_fsc;
+	EMUFS_FSC reg;
+	char name_f_fsc[255];
+	int 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));
 }