src/jacu.c

   1
   2 #include "blocksorting/bs.h"
   3 #include "mtf/mtf.h"
   4 #include "zerogrouping/zerogrouping.h"
   5 #include "statichuff/statichuff.h"
   6 #include "vfile/vfile.h"
   7 #include "vfile/common.h"
   8 #include <stdlib.h>
   9 #include <stdio.h>
  10 #include <unistd.h>
  11
  12 long get_file_size(const char* filename);
  13
  14 int main(int argc, char* argv[])
  15 {
  16         int cflag = 0;
  17         int dflag = 0;
  18         int zflag = 0;
  19         int tflag = 0;
  20         int pflag = 0;
  21         long int volumesize = 0;
  22         size_t pagesize = 32768; /* 32KB */
  23         int ch;
  24         t_BlockSort *bs;
  25
  26         while ((ch = getopt(argc, argv, "cdzt:p:")) != -1) {
  27
  28                 switch (ch) {
  29                         case 'c': cflag = 1;
  30                                           break;
  31
  32                         case 'd': dflag = 1;
  33                                           break;
  34
  35                         case 'z': zflag = 1;
  36                                           break;
  37
  38                         case 't': tflag = 1;
  39                                           volumesize = atol(optarg);
  40                                           break;
  41
  42                         case 'p': pflag = 1;
  43                                           pagesize = atoi(optarg);
  44                                           break;
  45
  46                         default: fprintf(stderr, "Usage: %s [-cdpt] sourcefile targetfile\n", argv[0]);
  47                                          return(2);
  48                 }
  49         }
  50
  51         if ( (argc == 1) || (cflag & dflag) || !(cflag | dflag) || ((argc - optind) < 2) ) {
  52                 fprintf(stderr, "Usage: %s [-cdt] sourcefile targetfile\n", argv[0]);
  53                 return (3);
  54         }
  55         if ((tflag) && (volumesize <= 0l)) {
  56                 fprintf(stderr,"Error: The volume size must be a non-zero value\n");
  57                 return (4);
  58         }
  59         if ((pflag) && (pagesize <= 1u)) {
  60                 fprintf(stderr,"Error: El tamaño de página debe ser mayor a 1 byte.\n");
  61                 return (5);
  62         }
  63
  64         if (cflag == 1) {
  65                 /* Comprimo */
  66                 /* No me gusta el tmpfile ... es para probar como anda todo junto */
  67                 FILE *fp, *fp_out;
  68                 Uint32 i, j, total, k;
  69                 char *mtf;
  70                 char *salida, *data, c;
  71                 char *z;
  72                 int z_len;
  73
  74                 data = malloc(sizeof(char)*pagesize);
  75                 /* Reservo lugar tambien para guardar el k y el tamaño  */
  76                 salida = malloc(sizeof(char)*(pagesize)+sizeof(Uint32)*2);
  77                 bs = bs_create(pagesize);
  78
  79                 fp = fopen(argv[optind], "rb");
  80                 fp_out = fopen("tmp.comp", "wb");
  81
  82                 c = fgetc(fp);
  83                 total = 0;
  84                 while (!feof(fp)) {
  85                         i = 0;
  86                         while ((!feof(fp)) && (i < pagesize)) {
  87                                 data[i++] = c;
  88                                 c = fgetc(fp);
  89                                 total++;
  90                         }
  91
  92                         /* Hago el BS */
  93                         bs_solve(data, salida, bs, &k, i);
  94
  95                         /* Le aplico el MTF, salteo el tamaño del bloque para que no se pierda. */
  96                         mtf = jacu_mtf(salida+sizeof(Uint32), i+sizeof(Uint32), &z, &z_len);
  97
  98                         /* Si me lo piden, aplico ZG. */
  99                         if (zflag) {
 100                                 size_t len;
 101                                 char buff[2];
 102                                 ZG zg;
 103                                 zg_init(&zg);
 104                                 /* TODO HACER LO MISMO QUE EN EL ELSE XXX */
 105                                 for (j = 0; j < i; ++j)
 106                                         if ((len = zg_group(&zg, buff, mtf[j]))) fwrite(buff, 1, len, fp_out);
 107                         } else {
 108                                 /* Guardo el PageSize */
 109                                 //for(j=0; j<sizeof(Uint32); j++)
 110                                 //      fputc(mtf[j], fp_out);
 111                                 fwrite(mtf, sizeof(Uint32), 1, fp_out);
 112
 113                                 /* Guardo el Z len y el Z */
 114                                 fwrite(&z_len, sizeof(int), 1, fp_out);
 115                                 fwrite(z, z_len, sizeof(char), fp_out);
 116
 117                                 /* Guardo la salida del MTF */
 118                                 for(j=sizeof(Uint32); j<i; j++)
 119                                         fputc(mtf[j], fp_out);
 120                         }
 121                         free(mtf);
 122                         free(z);
 123                 }
 124
 125                 /* Limpiando */
 126                 fclose(fp);
 127                 fclose(fp_out);
 128                 bs_destroy(bs);
 129
 130                 /* Comprimo con huffman */
 131                 i = shuff_encode_file("tmp.comp",argv[optind+1], volumesize);
 132
 133                 /* borro el temporal */
 134                 unlink("tmp.comp");
 135
 136                 /* Muestro bpb */
 137                 printf("Comprimido a %.04f bpb.\n", get_file_size(argv[optind+1])*8.0/get_file_size(argv[optind]));
 138                 return i;
 139         }
 140
 141         if (dflag == 1) {
 142                 /* Descomprimo */
 143                 FILE *fp_out;
 144                 FILE *fp_in;
 145                 Uint32 block_size, k;
 146                 char *block, *mtf, *orig;
 147                 char *z;
 148                 int z_len;
 149
 150                 shuff_decode_file(argv[optind], "tmp.comp"); /*argv[optind+1]);*/
 151                 fp_in = fopen("tmp.comp", "rb");
 152                 fp_out = fopen(argv[optind+1], "wb");
 153
 154                 while (!feof(fp_in)) {
 155                         block_size = 0;
 156                         PERR("Leo bloque");
 157                         fread(&block_size, sizeof(Uint32), 1, fp_in);
 158                         fread(&z_len, sizeof(int), 1, fp_in);
 159                         z = malloc(sizeof(char)*z_len);
 160                         fread(z, z_len, sizeof(char), fp_in);
 161
 162                         if (block_size > 0) {
 163                                 block = malloc(block_size*sizeof(char)+sizeof(Uint32));
 164                                 orig = malloc(block_size*sizeof(char));
 165                                 fread(block, block_size, sizeof(char), fp_in);
 166
 167                                 /* Hago el MTF inverso */
 168                                 mtf = jacu_mtf_inv(z, block, block_size);
 169
 170                                 /* Luego de hacer el MTF inverso ya puedo recuperar el k */
 171                                 memcpy(&k, block, sizeof(Uint32));
 172
 173                                 bs_restore(orig, block+sizeof(Uint32), k, block_size);
 174
 175                                 fwrite(orig, block_size, sizeof(char), fp_out);
 176                                 free(block);
 177                                 free(orig);
 178                                 free(mtf);
 179                         }
 180                 }
 181                 fclose(fp_in);
 182                 fclose(fp_out);
 183         }
 184
 185         return 0;
 186 }
 187
 188 long get_file_size(const char* filename)
 189 {
 190         FILE* file;
 191         long  file_size;
 192
 193         if (!(file = fopen(filename, "ab"))) return -1;
 194         file_size = ftell(file);
 195         fclose(file);
 196         return file_size;
 197 }
 198