Primer intento de compactar(). Parece andar bien lo que esta implementado. Falta

[z.facultad/75.06/emufs.git] / emufs / fsc.c

diff --git a/emufs/fsc.c b/emufs/fsc.c
index 164050ec0603b192a698146a4395e1e80eed2b4e..a76ca104eefc3da17c076a2997e4ba4f788fc79b 100644 (file)
--- a/emufs/fsc.c
+++ b/emufs/fsc.c
@@ -55,12 +55,23 @@ int emufs_fsc_agregar(EMUFS *emu, EMUFS_BLOCK_ID marker, EMUFS_FREE freespace)
        strcpy(name_f_fsc,emu->nombre);
        strcat(name_f_fsc, EMUFS_FSC_EXT);
        
+       /* Lo guardo en el archivo al final "a+"*/
+       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;
-
-       /* Lo guardo en el archivo al final "a+"*/
-       if ( (f_fsc = fopen(name_f_fsc,"a+"))==NULL ) return -1;
        fwrite(&reg,sizeof(EMUFS_FSC),1,f_fsc);
        fclose(f_fsc);
        return 0;
@@ -280,6 +291,17 @@ EMUFS_BLOCK_ID emufs_fsc_buscar_lugar(EMUFS *emu, EMUFS_FREE reg_size, EMUFS_FRE
 
        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)){
@@ -342,3 +364,72 @@ EMUFS_FREE emufs_fsc_get_total_fs(EMUFS *emu)
        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;
+}