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);
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);
+ if (n_gap_before < n_gap_after) {
+ fseek(f_fsc,sizeof(EMUFS_FSC)*n_gap_before,0);
+ n_destination = sizeof(EMUFS_FSC)*n_gap_after;
+ }
+ else {
+ fseek(f_fsc,sizeof(EMUFS_FSC)*n_gap_after,0);
+ n_destination = sizeof(EMUFS_FSC)*n_gap_before;
+ }
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);
- /* Guardamos la posicion actual del fpi pues sera en donde comenzaremos */
- /* a mover los registros a recompactar. Ademas, calculo cuantos regs mover */
- n_destination = sizeof(EMUFS_FSC)*n_gap_after;
- n_source = n_destination+sizeof(EMUFS_FSC); /* Salteo el gap_after! */
+ /* Preparo el escenario para la movida de registros */
+ n_source = n_destination+sizeof(EMUFS_FSC); /* Salteo el gap que elimino! */
fseek(f_fsc,0,SEEK_END);
n_filesize = ftell(f_fsc);
n_reg_count = (n_filesize - n_source) / sizeof(EMUFS_FSC);
++n_moved;
}
fclose(f_fsc);
- truncate(name_f_fsc, n_filesize - sizeof(EMUFS_FSC));
+ truncate(name_f_fsc, n_filesize - 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)
+{
+ 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)
{
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(®,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;
fclose(f_fsc);
return reg.n_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(®, sizeof(EMUFS_FSC), 1, f_fsc) != 1) continue;
+ total += reg.n_freespace;
+ }
+ fclose(f_fsc);
+ return total;
+}
projects / z.facultad / 75.06 / emufs.git / blobdiff