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

diff --git a/src/statichuff/statichuff.c b/src/statichuff/statichuff.c
index 540800d2dda6bca61fb0b8770cbd31585238acbc..6d6de7f613f078696870adb19d79fbbed25151ac 100644 (file)
--- a/src/statichuff/statichuff.c
+++ b/src/statichuff/statichuff.c
@@ -1,11 +1,11 @@
 
 #include "statichuff.h"
+#include <stdlib.h>
 
 void putbit(char bit, char restart, char flush, FILE *fp)
 {
        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)) {
@@ -42,10 +42,10 @@ void shuff_cpynode(SHUFFNODE *node1, SHUFFNODE *node2)
        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;
 }
 
@@ -119,9 +119,8 @@ SHUFFNODE *shuff_buildlist(t_freq *freqtable, int *nonzerofreqs)
 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);                         
@@ -192,8 +191,8 @@ void shuff_buildcodes(SHUFFCODE *table, SHUFFNODE *node, int level, int code)
 
 
 
-int shuff_encode_symbols(t_freq *ftable, SHUFFCODE *ctable, char* inputfile, char *outputfile) {
-
+int shuff_encode_symbols(t_freq *ftable, SHUFFCODE *ctable, char* inputfile, char *outputfile)
+{
        FILE *fpsource,*fpdest;
        int symbol,i;
        unsigned long int sourcesize;
@@ -239,10 +238,10 @@ int shuff_encode_file(char *inputfile, char *outputfile)
        SHUFFNODE *inputlist;
        SHUFFNODE *codetree;
        SHUFFCODE *codetable = (SHUFFCODE*)malloc(sizeof(SHUFFCODE)*256);
-       int freqcount = 0,i;
+       int freqcount = 0;
        
        /* 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);
@@ -251,45 +250,81 @@ 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);
-       shuff_printcodes(codetable,freqtable);
+       /*shuff_printcodes(codetable,freqtable);*/
 
        /* Encodeo byte per byte */
        shuff_encode_symbols(freqtable,codetable,inputfile,outputfile);
+       
+       /* Free up memory baby yeah */
+       free(freqtable);
+       free(inputlist);        
+       free(codetable);
+       
+       return 1;
 }
 
-int shuff_decode(char *inputfile, char *outputfile)
+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_file(char *inputfile, char *outputfile)
 {
        SHUFFNODE *inputlist;
-       SHUFFNODE *codetree;
+       SHUFFNODE *codetree,*currnode;
        t_freq *ftable = (t_freq*)malloc(sizeof(t_freq)*256);
-       unsigned long int bytesleft;
+       unsigned long int bytesleft,codebuffer;
        FILE *fpsource;
        FILE *fpdest;
-       int i,freqcount = 0;
+       unsigned short int decoded_symbol;
+       int bitsleft,freqcount = 0;     
        
        /* 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);
+       fread(ftable,sizeof(unsigned long int),256,fpsource);   
        inputlist = shuff_buildlist(ftable, &freqcount);
        codetree = shuff_buildtree(inputlist,freqcount);
+       currnode = codetree;
+       
+       while (!feof(fpsource) && (bytesleft > 0)) {
+               
+               /* Leo un buffer de 32 bits */
+               if (fread(&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;                            
+                       }                                               
+               }               
+       }
                
        fclose(fpsource);
        fclose(fpdest);
        
+       /* Free up memory baby yeah */
+       free(ftable);
+       free(inputlist);
        
+       return 1;
 }
 
-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;
-}