Agrego descompresor. No funciona porque me esta faltando el vector "pos" del MTF...

[z.facultad/75.06/jacu.git] / src / jacu.c

diff --git a/src/jacu.c b/src/jacu.c
index 68f929d3846f21c2e2ebed8ab2ca874624e93e5d..3d18ed3be44af85c1c97ae75db13ec99fe6283ff 100644 (file)
--- a/src/jacu.c
+++ b/src/jacu.c
@@ -2,6 +2,7 @@
 #include "statichuff/statichuff.h"
 #include "blocksorting/bs.h"
 #include "mtf/mtf.h"
+#include "vfile/vfile.h"
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>
@@ -11,67 +12,90 @@ int main(int argc, char* argv[])
        int cflag = 0;
        int dflag = 0;
        int tflag = 0;
+       int pflag = 0;
        long int volumesize = 0;
+       size_t pagesize = 32768; /* 32KB */
        int ch;
        t_BlockSort *bs;
                        
-       while ((ch = getopt(argc, argv, "cdt:")) != -1) { 
+       while ((ch = getopt(argc, argv, "cdt:p:")) != -1) { 
                 
                switch (ch) { 
                        case 'c': cflag = 1; 
                                          break;
-                       
+
                        case 'd': dflag = 1; 
                                          break; 
-                       
+
                        case 't': tflag = 1; 
-                                         volumesize = atoi(optarg);                                      
+                                         volumesize = atol(optarg);
                                          break; 
-                       
-                       default: fprintf(stderr, "Usage: %s [-cdt] sourcefile targetfile\n", argv[0]); 
+
+                       case 'p': pflag = 1; 
+                                         pagesize = atoi(optarg);
+                                         break; 
+
+                       default: fprintf(stderr, "Usage: %s [-cdpt] sourcefile targetfile\n", argv[0]); 
                                         return(2);
                }
        }
                
        if ( (argc == 1) || (cflag & dflag) || !(cflag | dflag) || ((argc - optind) < 2) ) {
                fprintf(stderr, "Usage: %s [-cdt] sourcefile targetfile\n", argv[0]); 
-               if ((tflag == 1) && (volumesize <= 0)) fprintf(stderr,"Error: The volume size must be a non-zero value\n");
-               return (2);             
+               return (3);
+       }
+       if ((tflag) && (volumesize <= 0l)) {
+               fprintf(stderr,"Error: The volume size must be a non-zero value\n");
+               return (4);
+       }
+       if ((pflag) && (pagesize <= 1u)) {
+               fprintf(stderr,"Error: El tamaño de página debe ser mayor a 1 byte.\n");
+               return (5);
        }
                
        if (cflag == 1) {
                /* Comprimo */
                /* No me gusta el tmpfile ... es para probar como anda todo junto */
                FILE *fp, *fp_out;
-               unsigned long int len, i, j, total, k;
-               int *mtf;
+               unsigned long int i, j, total, k;
+               char *mtf;
                char *salida, *data, c;
-               len = 4096;
-               data = malloc(sizeof(char)*len);
-               salida = malloc(sizeof(char)*(len));
-               bs = bs_create(len);
+               data = malloc(sizeof(char)*pagesize);
+               /* Reservo lugar tambien para guardar el k y el tamaño  */
+               salida = malloc(sizeof(char)*(pagesize)+sizeof(unsigned long int)*2);
+               bs = bs_create(pagesize);
+
                fp = fopen(argv[optind], "rb");
                fp_out = fopen("tmp.comp", "wb");
+
                c = fgetc(fp);
                total = 0;
                while (!feof(fp)) {
                        i = 0;
-                       while ((!feof(fp)) && (i < len)) {
+                       while ((!feof(fp)) && (i < pagesize)) {
                                data[i++] = c;
                                c = fgetc(fp);
                                total++;
                        }
+
                        /* Hago el BS */
                        bs_solve(data, salida, bs, &k, i);
-                       /* Le aplico el MTF */
-                       mtf = jacu_mtf(salida, i);
+
+                       /* Le aplico el MTF, salteo el tamaño del bloque para que no se pierda. */
+                       mtf = jacu_mtf(salida+sizeof(unsigned long int), i+sizeof(unsigned long int));
                        for(j=0; j<i; j++)
                                fputc(mtf[j], fp_out);
+                       free(mtf);
                }
+
+               /* Limpiando */
                fclose(fp);
                fclose(fp_out);
                bs_destroy(bs);
+
+               /* Comprimo con huffman */
                i = shuff_encode_file("tmp.comp",argv[optind+1], volumesize);
+
                /* borro el temporal */
                unlink("tmp.comp");
                return i;
@@ -79,8 +103,39 @@ int main(int argc, char* argv[])
        
        if (dflag == 1) { 
                /* Descomprimo */
-               return shuff_decode_file(argv[optind],argv[optind+1]);
+               FILE *fp_out;
+               VFILE *fp_in;
+               unsigned long int block_size, k;
+               char *block, *mtf, *orig;
+               int *pos;
+
+               shuff_decode_file(argv[optind], "tmp.comp"); /*argv[optind+1]);*/
+               fp_in = vfopen("tmp.comp", "r", 0);
+               fp_out = fopen(argv[optind+1], "wb");
+
+               while (!vfeof(fp_in)) {
+                       block_size = 0;
+                       vfread(&block_size, sizeof(unsigned long int), 1, fp_in);
+                       if (block_size > 0) {
+                               block = malloc((block_size+sizeof(unsigned long int))*sizeof(char));
+                               orig = malloc(block_size*sizeof(char));
+                               vfread(block, block_size, sizeof(char), fp_in);
+
+                               mtf = jacu_mtf_inv(block, /*XXX NO LO TENGO XXX */pos, block_size);
+
+                               memcpy(&k, block, sizeof(unsigned long int));
+
+                               bs_restore(orig, block+sizeof(unsigned long int), k, block_size);
+
+                               fwrite(orig, block_size, sizeof(char), fp_out);
+                               free(block);
+                               free(orig);
+                               free(mtf);
+                       }
+               }
+               vfclose(fp_in);
+               fclose(fp_out);
        }
-               
+
        return 0;
 }