Huffman ya comprime multivolumen, pero aun funciona descompresion de multivolumen...

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

diff --git a/src/statichuff/statichuff.c b/src/statichuff/statichuff.c
index e1dfe3537424cc2da4d68c18e5b73de28cbb6688..0a3fa0139de82a46e329464bae0c4e4c8059b863 100644 (file)
--- a/src/statichuff/statichuff.c
+++ b/src/statichuff/statichuff.c
@@ -1,17 +1,17 @@
 
 #include "statichuff.h"
 
 #include "statichuff.h"

+#include "../vfile/vfile.h"

 #include <stdlib.h>
 
 #include <stdlib.h>
 

-void putbit(char bit, char restart, char flush, FILE *fp)
+void putbit(char bit, char restart, char flush, VFILE *fp)

 {
        static unsigned long int bits_buffer = 0;
 {
        static unsigned long int bits_buffer = 0;

-       static unsigned char bits_used = 0;
-       int i;
+       static unsigned char bits_used = 0;     

 
        /* me obligan a emitir el output */
        if ((flush == 1) && (bits_used > 0)) {
                bits_buffer = bits_buffer << ((sizeof(unsigned long int)*8) - bits_used);
 
        /* me obligan a emitir el output */
        if ((flush == 1) && (bits_used > 0)) {
                bits_buffer = bits_buffer << ((sizeof(unsigned long int)*8) - bits_used);

-               fwrite(&bits_buffer,sizeof(unsigned long int),1,fp);
+               vfwrite(&bits_buffer,sizeof(unsigned long int),1,fp);

                bits_buffer = 0;
                bits_used = 0;
                return;
                bits_buffer = 0;
                bits_used = 0;
                return;


@@ -28,7 +28,7 @@ void putbit(char bit, char restart, char flush, FILE *fp)
        
        /* lleno el buffer, escribo */
        if (bits_used == 32) {
        
        /* lleno el buffer, escribo */
        if (bits_used == 32) {

-               fwrite(&bits_buffer,sizeof(unsigned long int),1,fp);
+               vfwrite(&bits_buffer,sizeof(unsigned long int),1,fp);

                bits_buffer = 0;
                bits_used = 0;
        }       
                bits_buffer = 0;
                bits_used = 0;
        }       


@@ -43,10 +43,10 @@ void shuff_cpynode(SHUFFNODE *node1, SHUFFNODE *node2)
        node1->rchild = node2->rchild;  
 }
 
        node1->rchild = node2->rchild;  
 }
 

-int shuff_compnode(SHUFFNODE *node1, SHUFFNODE *node2)
+int shuff_compnode(const void *node1, const void *node2)

 {      
 {      

-       if (node1->freq < node2->freq) return 1;
-       if (node1->freq > node2->freq) return -1;
+       if (((SHUFFNODE*)node1)->freq < ((SHUFFNODE*)node2)->freq) return 1;
+       if (((SHUFFNODE*)node1)->freq > ((SHUFFNODE*)node2)->freq) return -1;

        return 0;
 }
 
        return 0;
 }
 


@@ -76,7 +76,7 @@ int shuff_scanfreq(char *inputfile, t_freq *freqtable)
        for (i = 0; i < 256; ++i) freqtable[i] = 0;
                
        /* Abrimos el file */
        for (i = 0; i < 256; ++i) freqtable[i] = 0;
                
        /* Abrimos el file */

-       if ((fp = fopen(inputfile,"rb")) == NULL) return 0;
+       if ((fp = fopen(inputfile,"r")) == NULL) return 0;

        while (!feof(fp)) {             
                /* Contamos las frecuencias */          
                symbol = fgetc(fp);
        while (!feof(fp)) {             
                /* Contamos las frecuencias */          
                symbol = fgetc(fp);


@@ -91,7 +91,7 @@ int shuff_scanfreq(char *inputfile, t_freq *freqtable)
        }
        
        fclose(fp);
        }
        
        fclose(fp);

-       return 1;       
+       return 1;

 }
 
 SHUFFNODE *shuff_buildlist(t_freq *freqtable, int *nonzerofreqs)
 }
 
 SHUFFNODE *shuff_buildlist(t_freq *freqtable, int *nonzerofreqs)


@@ -120,9 +120,8 @@ SHUFFNODE *shuff_buildlist(t_freq *freqtable, int *nonzerofreqs)
 SHUFFNODE *shuff_buildtree(SHUFFNODE *list, int listcount)
 {
        SHUFFNODE *lastsymbol = list+(listcount-1);
 SHUFFNODE *shuff_buildtree(SHUFFNODE *list, int listcount)
 {
        SHUFFNODE *lastsymbol = list+(listcount-1);

-       SHUFFNODE *node1,*node2,*fictnode;
+       SHUFFNODE *node1,*node2;

 
 

-       /* Ordenamos inicialmente la inputlist para tomar las dos freqs min */

        while (lastsymbol > list) {             
                /* Ordeno la lista por frecuencia descendente */
                qsort(list,listcount,sizeof(SHUFFNODE),shuff_compnode);                         
        while (lastsymbol > list) {             
                /* Ordeno la lista por frecuencia descendente */
                qsort(list,listcount,sizeof(SHUFFNODE),shuff_compnode);                         


@@ -191,25 +190,24 @@ void shuff_buildcodes(SHUFFCODE *table, SHUFFNODE *node, int level, int code)
        }
 }
 
        }
 }
 

-
-
-int shuff_encode_symbols(t_freq *ftable, SHUFFCODE *ctable, char* inputfile, char *outputfile) {
-
-       FILE *fpsource,*fpdest;
+int shuff_encode_symbols(t_freq *ftable, SHUFFCODE *ctable, char* inputfile, char *outputfile, long volsize)
+{
+       FILE *fpsource;
+       VFILE *fpdest;

        int symbol,i;
        unsigned long int sourcesize;
        char bit;
        SHUFFCODE symbolcode;
                
        /* Abrimos el file */
        int symbol,i;
        unsigned long int sourcesize;
        char bit;
        SHUFFCODE symbolcode;
                
        /* Abrimos el file */

-       if ((fpsource = fopen(inputfile,"rb")) == NULL) return 0;
-       if ((fpdest = fopen(outputfile,"wb")) == NULL) return 0;
+       if ((fpsource = fopen(inputfile,"r")) == NULL) return 0;
+       if ((fpdest = vfopen(outputfile,"w",volsize)) == NULL) return 0;

                
        /* Guardamos el size el archivo original e inputlist como header */
        fseek(fpsource,0,SEEK_END);
        sourcesize = ftell(fpsource);
                
        /* Guardamos el size el archivo original e inputlist como header */
        fseek(fpsource,0,SEEK_END);
        sourcesize = ftell(fpsource);

-       fwrite(&sourcesize,sizeof(unsigned long int),1,fpdest);
-       fwrite(ftable,sizeof(t_freq),256,fpdest);
+       vfwrite(&sourcesize,sizeof(unsigned long int),1,fpdest);
+       vfwrite(ftable,sizeof(t_freq),256,fpdest);

        
        /* Encodeo */
        fseek(fpsource,0,SEEK_SET);
        
        /* Encodeo */
        fseek(fpsource,0,SEEK_SET);


@@ -229,21 +227,21 @@ int shuff_encode_symbols(t_freq *ftable, SHUFFCODE *ctable, char* inputfile, cha
        /* Hacemos un flush de lo que haya quedado en el buffer de salida */
        putbit(0,0,1,fpdest);
        fclose(fpsource);
        /* Hacemos un flush de lo que haya quedado en el buffer de salida */
        putbit(0,0,1,fpdest);
        fclose(fpsource);

-       fclose(fpdest);
+       vfclose(fpdest);

        return 1;       
 }
 
        return 1;       
 }
 

-int shuff_encode_file(char *inputfile, char *outputfile)
+int shuff_encode_file(char *inputfile, char *outputfile, long volsize)

 {
        /* Locals */
        t_freq *freqtable = (t_freq*)malloc(sizeof(t_freq)*256);
        SHUFFNODE *inputlist;
        SHUFFNODE *codetree;
        SHUFFCODE *codetable = (SHUFFCODE*)malloc(sizeof(SHUFFCODE)*256);
 {
        /* Locals */
        t_freq *freqtable = (t_freq*)malloc(sizeof(t_freq)*256);
        SHUFFNODE *inputlist;
        SHUFFNODE *codetree;
        SHUFFCODE *codetable = (SHUFFCODE*)malloc(sizeof(SHUFFCODE)*256);

-       int freqcount = 0,i;
+       int freqcount = 0;

        
        /* Armamos la tabla de frecuencias */
        
        /* Armamos la tabla de frecuencias */

-       if (!shuff_scanfreq(inputfile,freqtable)) return -1;
+       if (!shuff_scanfreq(inputfile,freqtable)) return 0;

        
        /* Armo el input list y genero el arbol de huffman */
        inputlist = shuff_buildlist(freqtable, &freqcount);
        
        /* Armo el input list y genero el arbol de huffman */
        inputlist = shuff_buildlist(freqtable, &freqcount);


@@ -252,45 +250,80 @@ int shuff_encode_file(char *inputfile, char *outputfile)
        /* Armo la tabla de codigos prefijos para el encoder */
        shuff_zerocodes(codetable);
        shuff_buildcodes(codetable,codetree,0,0);
        /* Armo la tabla de codigos prefijos para el encoder */
        shuff_zerocodes(codetable);
        shuff_buildcodes(codetable,codetree,0,0);

-       shuff_printcodes(codetable,freqtable);
+       /*shuff_printcodes(codetable,freqtable);*/

 
        /* Encodeo byte per byte */
 
        /* Encodeo byte per byte */

-       shuff_encode_symbols(freqtable,codetable,inputfile,outputfile);
+       shuff_encode_symbols(freqtable,codetable,inputfile,outputfile,volsize);
+       
+       /* Free up memory baby yeah */
+       free(freqtable);
+       free(inputlist);        
+       free(codetable);
+       
+       return 1;
+}
+
+SHUFFNODE *shuff_decode_symbols(SHUFFNODE *entrynode, unsigned long int buffer, 
+                                                        int *bitsleft, unsigned short int *symbol)
+{
+       char bit = 0;
+               
+       /* Levanto el symbolo y si es uno valido, devuelvo */
+       *symbol = entrynode->symbol;
+       if (*symbol != 256) return entrynode;           
+       if (*bitsleft == 0) return entrynode;
+               
+       /* Obtengo otro bit a procesar y me muevo en el arbol */
+       bit = (buffer >> ((*bitsleft)-1)) & 1;  
+       --(*bitsleft);
+       if (bit == 0) return shuff_decode_symbols(entrynode->lchild,buffer,bitsleft,symbol);
+       else return shuff_decode_symbols(entrynode->rchild,buffer,bitsleft,symbol);

 }
 
 }
 

-int shuff_decode(char *inputfile, char *outputfile)
+int shuff_decode_file(char *inputfile, char *outputfile)

 {
        SHUFFNODE *inputlist;
 {
        SHUFFNODE *inputlist;

-       SHUFFNODE *codetree;
+       SHUFFNODE *codetree,*currnode;

        t_freq *ftable = (t_freq*)malloc(sizeof(t_freq)*256);
        t_freq *ftable = (t_freq*)malloc(sizeof(t_freq)*256);

-       unsigned long int bytesleft;
-       FILE *fpsource;
+       unsigned long int bytesleft,codebuffer;
+       VFILE *fpsource;

        FILE *fpdest;
        FILE *fpdest;

-       int i,freqcount = 0;
+       unsigned short int decoded_symbol;
+       int bitsleft,freqcount = 0;     

        
        /* Levanto cuantos bytes decodeo y la freq table */
        
        /* Levanto cuantos bytes decodeo y la freq table */

-       if ((fpsource = fopen(inputfile,"rb")) == NULL) return 0;
-       if ((fpdest = fopen(outputfile,"wb")) == NULL) return 0;
-       fread(&bytesleft,sizeof(unsigned long int),1,fpsource);
-       fread(ftable,sizeof(unsigned long int),256,fpsource);
+       if ((fpsource = vfopen(inputfile,"r",0)) == NULL) return 0;
+       if ((fpdest = fopen(outputfile,"w")) == NULL) return 0;
+       vfread(&bytesleft,sizeof(unsigned long int),1,fpsource);
+       vfread(ftable,sizeof(unsigned long int),256,fpsource);  

        inputlist = shuff_buildlist(ftable, &freqcount);
        codetree = shuff_buildtree(inputlist,freqcount);
        inputlist = shuff_buildlist(ftable, &freqcount);
        codetree = shuff_buildtree(inputlist,freqcount);

+       currnode = codetree;
+       
+       while (!feof(fpsource->fp) && (bytesleft > 0)) {

                
                

-       fclose(fpsource);
+               /* Leo un buffer de 32 bits */
+               if (vfread(&codebuffer,sizeof(unsigned long int),1,fpsource) != 1) continue;
+               bitsleft = sizeof(unsigned long int) * 8;
+               
+               /* Proceso el buffer sacando simbolos hasta que se me agote */
+               while ((bitsleft > 0) && (bytesleft > 0)) {     
+                       currnode = shuff_decode_symbols(currnode,codebuffer,&bitsleft,&decoded_symbol);
+                       /* Si obtuve un symbolo valido lo emito*/
+                       if (decoded_symbol != 256) {
+                               fputc(decoded_symbol,fpdest);
+                               currnode = codetree;
+                               --bytesleft;                            
+                       }                                               
+               }               
+       }
+               
+       vfclose(fpsource);

        fclose(fpdest);
        
        fclose(fpdest);
        

+       /* Free up memory baby yeah */
+       free(ftable);
+       free(inputlist);

        
        

-}
-
-int main(int argc, char* argv[])
-{      
-       if (argc == 1) return -1;
-               
-       /* Comprimo */
-       shuff_encode_file(argv[1],"output.shf");        
-
-       /* Decodeo */
-       shuff_decode("output.shf","decoded.dat");
-       
-       return 0;
+       return 1;

 }
 }