X-Git-Url: https://git.llucax.com/z.facultad/75.06/emufs.git/blobdiff_plain/d523d5c3a87c794485680019e0343c490357574e..1251aa5beb1ae288e30468141c763d56e04a6bab:/emufs/fsc.c

diff --git a/emufs/fsc.c b/emufs/fsc.c
index a94a2f1..43dc627 100644
--- a/emufs/fsc.c
+++ b/emufs/fsc.c
@@ -74,8 +74,7 @@ int emufs_fsc_agregar_gap(EMUFS *emu, EMUFS_OFFSET n_marker, EMUFS_FREE n_freesp
 	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;
-	
-	
+		
 	strcpy(name_f_fsc,emu->nombre);
 	strcat(name_f_fsc, EMUFS_FSC_EXT);
 	
@@ -154,8 +153,7 @@ int emufs_fsc_agregar_gap(EMUFS *emu, EMUFS_OFFSET n_marker, EMUFS_FREE n_freesp
 	  gap_new.n_freespace = gap_before.n_freespace + n_freespace + gap_after.n_freespace;
 	  fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
 		
-	  /* Guardamos la posicion actual del fpi pues sera en donde comenzaremos */
-	  /* a mover los registros a recompactar. Ademas, calculo cuantos regs mover */
+	  /* 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);
@@ -179,6 +177,48 @@ int emufs_fsc_agregar_gap(EMUFS *emu, EMUFS_OFFSET n_marker, EMUFS_FREE n_freesp
     return 0;
 }
 
+/* Elimina un registro GAP del archivo de espacios libres (gaps) */
+int emufs_fsc_remove_gap(EMUFS *emu, EMUFS_OFFSET n_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;	
+		
+	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.n_marker == n_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! */
+	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_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;
+	}
+	fclose(f_fsc);
+	truncate(name_f_fsc, n_filesize - 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)
 {
@@ -204,29 +244,58 @@ int emufs_fsc_actualizar(EMUFS *emu, EMUFS_BLOCK_ID n_marker, EMUFS_FREE n_frees
 	return 0;
 }
 
+/* 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)
+{
+	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.n_marker == n_marker ){
+			gap_aux.n_marker = n_marker + gap_aux.n_freespace - n_freespace;
+			gap_aux.n_freespace = n_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 n_RegSize, EMUFS_FREE *n_freespace)
+EMUFS_BLOCK_ID emufs_fsc_buscar_lugar(EMUFS *emu, EMUFS_FREE n_regsize, EMUFS_FREE *n_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;
 
 	/* 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.n_freespace >= n_regsize) {
+			found = 1;
+			break;
+		}
 	}
 	
 	/* Si salio por error o por fin de archivo y no encontro space... */
-	if (!b_Found) {
-	  reg.n_marker = -1;
+	if (!found) {
+	  reg.n_marker = EMUFS_NOT_FOUND;
 	  *n_freespace = emu->tam_bloque; 
 	}
 	else *n_freespace = reg.n_freespace;