#include "statichuff.h"
+#include "../vfile/vfile.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 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);
- 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;
/* 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;
}
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;
}
t_freq totalfreq = 0;
/* Divido por la mitad las frecuencias, asegurando de no perder */
- /* frequencias en 1, por ello le sumo 1 antes de partir */
for (i = 0; i < 256; i++) {
- freqtable[i] = (freqtable[i] << 2) | 1;
+ freqtable[i] = (freqtable[i] >> 2) | 1;
totalfreq += freqtable[i];
}
return totalfreq;
}
+int shuff_scanfreq_chunk(HUFF_STATE *chunkshuff, char* chunk, int chunksize)
+{
+ /* Locals */
+ int i = 0;
+ unsigned char symbol = 0;
+
+ /* Contamos las frecuencias del chunk*/
+ for (i = 0; i < chunksize; ++i) {
+ symbol = chunk[i];
+ chunkshuff->freqtable[symbol] += 1;
+ chunkshuff->sumfreq += 1;
+
+ /* Si llegue al tope de freq acumulada, halve em */
+ if (chunkshuff->sumfreq == 14930352)
+ chunkshuff->sumfreq = shuff_rescalefreq(chunkshuff->freqtable);
+ }
+
+ return 1;
+}
+
int shuff_scanfreq(char *inputfile, t_freq *freqtable)
{
/* Locals */
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);
}
fclose(fp);
- return 1;
+ return 1;
}
SHUFFNODE *shuff_buildlist(t_freq *freqtable, int *nonzerofreqs)
return inputlist;
}
-SHUFFNODE *shuff_buildtree(SHUFFNODE *list, int listcount)
+SHUFFNODE *shuff_buildtree(t_freq *ftable)
{
- SHUFFNODE *lastsymbol = list+(listcount-1);
- SHUFFNODE *node1,*node2,*fictnode;
+ SHUFFNODE *lastsymbol;
+ SHUFFNODE *node1,*node2,*root;
+ SHUFFNODE *inputlist;
+ int freqcount = 0;
- /* Ordenamos inicialmente la inputlist para tomar las dos freqs min */
- while (lastsymbol > list) {
+ /* Genero la input list en base a la cual genera el arbol */
+ inputlist = shuff_buildlist(ftable, &freqcount);
+ lastsymbol = inputlist+(freqcount-1);
+
+ while (lastsymbol > inputlist) {
/* Ordeno la lista por frecuencia descendente */
- qsort(list,listcount,sizeof(SHUFFNODE),shuff_compnode);
+ qsort(inputlist,freqcount,sizeof(SHUFFNODE),shuff_compnode);
/* Tomo los ultimos dos elementos, generando dos nodos del arbol */
node1 = (SHUFFNODE*)malloc(sizeof(SHUFFNODE));
node2 = (SHUFFNODE*)malloc(sizeof(SHUFFNODE));
lastsymbol->freq = node1->freq + node2->freq;
lastsymbol->lchild = node1;
lastsymbol->rchild = node2;
- --listcount;
+ --freqcount;
}
-
+
+ /* Copio la raiz para poder liberar la lista sin perderla */
+ root = (SHUFFNODE*)malloc(sizeof(SHUFFNODE));
+ shuff_cpynode(root,lastsymbol);
+
+ /* Free up mem */
+ free(inputlist);
+
/* Devuelvo el puntero a la raiz del arbol de huffman */
- return lastsymbol;
+ return root;
}
void shuff_printcodes(SHUFFCODE *codetable,t_freq *freqtable)
}
}
-
-
-int shuff_encode_symbols(t_freq *ftable, SHUFFCODE *ctable, char* inputfile, char *outputfile) {
-
- FILE *fpsource,*fpdest;
+int shuff_encode_symbols(HUFF_STATE *shuff, SHUFFCODE *ctable)
+{
+ FILE *fpsource;
+ VFILE *fpdest;
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(shuff->sourcefile,"r")) == NULL) return 0;
+ if ((fpdest = vfopen(shuff->targetfile,"w",shuff->volsize)) == NULL) return 0;
/* 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(shuff->freqtable,sizeof(t_freq),256,fpdest);
/* Encodeo */
fseek(fpsource,0,SEEK_SET);
/* 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;
}
-int shuff_encode_file(char *inputfile, char *outputfile)
+int shuff_encode_chunk(HUFF_STATE *chunkshuff, char *chunk, int chunksize, int process)
+{
+ int i;
+
+ if (!process) {
+ /* Scaneo las frecuencias de este chunk */
+ shuff_scanfreq_chunk(chunkshuff,chunk,chunksize);
+ }
+ else {
+ /* Ya tengo la tabla y el archivo temporal, paso al huffman by file */
+ return 0;
+ }
+
+ return 1;
+}
+
+HUFF_STATE *shuff_init_static_byfile(char *inputfile, char *outputfile, long volsize)
{
/* Locals */
- t_freq *freqtable = (t_freq*)malloc(sizeof(t_freq)*256);
- SHUFFNODE *inputlist;
+ HUFF_STATE *fshuff = (HUFF_STATE*)malloc(sizeof(HUFF_STATE));
+ int i;
+
+ /* Inicializo la estructura para trabajar con Huff Static by File */
+ fshuff->tmpfp = NULL;
+ fshuff->sourcefile = (char*)malloc(sizeof(char)*(strlen(inputfile)+1));
+ fshuff->targetfile = (char*)malloc(sizeof(char)*(strlen(outputfile)+1));
+ strcpy(fshuff->sourcefile,inputfile);
+ strcpy(fshuff->targetfile,outputfile);
+ fshuff->preloadfreq = 0;
+ fshuff->volsize = volsize;
+ fshuff->sumfreq = 0;
+ fshuff->freqtable = (t_freq*)malloc(sizeof(t_freq)*256);
+ for (i = 0; i < 256; ++i) fshuff->freqtable[i] = 0;
+
+ return fshuff;
+}
+
+HUFF_STATE *shuff_init_static_bychunk(char *outputfile, long volsize)
+{
+ /* Locals */
+ HUFF_STATE *cshuff = (HUFF_STATE*)malloc(sizeof(HUFF_STATE));
+ FILE *fp;
+ int i;
+
+ /* Inicializo la estructura para trabajar con Huff Static by Chunks */
+ cshuff->sourcefile = (char*)malloc(sizeof(char)*(strlen(outputfile)+2));
+ cshuff->targetfile = (char*)malloc(sizeof(char)*(strlen(outputfile)+1));
+ strcpy(cshuff->targetfile,outputfile);
+ strcpy(cshuff->sourcefile,outputfile);
+ strcat(cshuff->sourcefile,"~");
+ cshuff->volsize = volsize;
+ cshuff->preloadfreq = 1;
+ cshuff->sumfreq = 0;
+ cshuff->freqtable = (t_freq*)malloc(sizeof(t_freq)*256);
+ for (i = 0; i < 256; ++i) cshuff->freqtable[i] = 0;
+
+ /* Abrimos un archivo temporal para ir tirando los chunks */
+ if ((cshuff->tmpfp = fopen(cshuff->sourcefile,"w")) == NULL) return NULL;
+
+ return cshuff;
+}
+
+void shuff_deinit_static_byfile(HUFF_STATE *fshuff)
+{
+ /* Libero mallocs y cierro archivos */
+ free(fshuff->freqtable);
+ free(fshuff->sourcefile);
+ free(fshuff->targetfile);
+}
+
+void shuff_deinit_static_bychunk(HUFF_STATE *cshuff)
+{
+ /* Libero mallocs y cierro archivos */
+ free(cshuff->freqtable);
+ free(cshuff->sourcefile);
+ free(cshuff->targetfile);
+ fclose(cshuff->tmpfp);
+}
+
+int shuff_encode_file(HUFF_STATE *shuff)
+{
+ /* Locals */
SHUFFNODE *codetree;
SHUFFCODE *codetable = (SHUFFCODE*)malloc(sizeof(SHUFFCODE)*256);
- int freqcount = 0,i;
+ int i;
- /* Armamos la tabla de frecuencias */
- if (!shuff_scanfreq(inputfile,freqtable)) return -1;
+ /* Veo si debo armar una freqtable o si esta preloaded */
+ if (!shuff->preloadfreq) if (!shuff_scanfreq(shuff->sourcefile,shuff->freqtable)) return 0;
- /* Armo el input list y genero el arbol de huffman */
- inputlist = shuff_buildlist(freqtable, &freqcount);
- codetree = shuff_buildtree(inputlist,freqcount);
+ /* Genero el arbol de huffman */
+ codetree = shuff_buildtree(shuff->freqtable);
/* 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,shuff->freqtable);*/
/* Encodeo byte per byte */
- shuff_encode_symbols(freqtable,codetable,inputfile,outputfile);
+ shuff_encode_symbols(shuff,codetable);
+
+ /* Free up memory baby yeah */
+ free(codetable);
+
+ /* Destruyo el arbol recursivamente TODO */
+
+ 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)
{
- SHUFFNODE *inputlist;
- SHUFFNODE *codetree;
- t_freq *ftable = (t_freq*)malloc(sizeof(t_freq)*256);
- unsigned long int bytesleft;
- FILE *fpsource;
+ 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(HUFF_STATE *shuff)
+{
+ SHUFFNODE *codetree,*currnode;
+ unsigned long int bytesleft,codebuffer;
+ VFILE *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);
- inputlist = shuff_buildlist(ftable, &freqcount);
- codetree = shuff_buildtree(inputlist,freqcount);
+ if ((fpsource = vfopen(shuff->sourcefile,"r",0)) == NULL) return 0;
+ if ((fpdest = fopen(shuff->targetfile,"w")) == NULL) return 0;
+ vfread(&bytesleft,sizeof(unsigned long int),1,fpsource);
+ vfread(shuff->freqtable,sizeof(unsigned long int),256,fpsource);
+ codetree = shuff_buildtree(shuff->freqtable);
+ currnode = codetree;
+
+ while (!vfeof(fpsource) && (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);
+ /* Libero el arbol recursivamente TODO */
-}
-
-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;
}
projects / z.facultad / 75.06 / jacu.git / blobdiff