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