-#include <stdio.h>
+#include "statichuff.h"
+#include <stdlib.h>
-typedef unsigned long int t_freq;
-
-typedef struct t_freqnode {
- unsigned short int symbol;
- t_freq freq;
- struct t_freqnode *lchild;
- struct t_freqnode *rchild;
-} HUFFNODE;
-
-typedef struct t_code {
- unsigned long int code;
- unsigned char codelength;
-} CODE;
-
-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;
+ static unsigned char bits_used = 0;
- /* me obligan a tirar el output */
+ /* me obligan a emitir el output */
if ((flush == 1) && (bits_used > 0)) {
- fwrite(&bits_buffer,sizeof(unsigned long int),1,fp);
+ bits_buffer = bits_buffer << ((sizeof(unsigned long int)*8) - bits_used);
+ 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;
}
return;
}
-void cpynode(HUFFNODE *node1, HUFFNODE *node2)
+void shuff_cpynode(SHUFFNODE *node1, SHUFFNODE *node2)
{
node1->symbol = node2->symbol;
node1->freq = node2->freq;
node1->rchild = node2->rchild;
}
-int compnode(HUFFNODE *node1, HUFFNODE *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;
}
-HUFFNODE *buildlist(t_freq *freqtable, int *nonzerofreqs)
-{
- int i,j = 0,nonzero = 0;
- HUFFNODE *inputlist;
-
- /* Calculo cuantas frequencias > 0 hay y creo la tabla */
- for (i = 0; i < 256; ++i) if (freqtable[i] > 0) nonzero++;
- inputlist = (HUFFNODE*)malloc(sizeof(HUFFNODE)*nonzero);
-
- /* Cargo la inputlist del huffman solo con freqs > 0 */
- for (i = 0; i < 256; ++i)
- if (freqtable[i] > 0) {
- inputlist[j].symbol = i;
- inputlist[j].freq = freqtable[i];
- inputlist[j].lchild = NULL;
- inputlist[j].rchild = NULL;
- j++;
- }
-
- *nonzerofreqs = nonzero;
- return inputlist;
-}
-
-int rescalefreq(t_freq *freqtable)
+int shuff_rescalefreq(t_freq *freqtable)
{
int i;
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 scanfreq(char *inputfile, t_freq *freqtable)
+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);
+ }
+
+ /* Dumpeamos el chunk en el temporal homero */
+ fwrite(chunk,chunksize,1,chunkshuff->coderfp);
+
+ return 1;
+}
+
+int shuff_scanfreq(char *inputfile, t_freq *freqtable)
{
/* Locals */
FILE *fp;
t_freq sumfreq = 0;
int i,symbol;
- /* Inicializamos la tabla de frecuencias */
+ /* Inicializamos la tabla de frecuencias */
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);
/* Si llegue al tope de freq acumulada, halve em */
if (sumfreq == 14930352)
- sumfreq = rescalefreq(freqtable);
+ sumfreq = shuff_rescalefreq(freqtable);
}
fclose(fp);
- return 1;
+ return 1;
+}
+
+SHUFFNODE *shuff_buildlist(t_freq *freqtable, int *nonzerofreqs)
+{
+ int i,j = 0,nonzero = 0;
+ SHUFFNODE *inputlist;
+
+ /* Calculo cuantas frequencias > 0 hay y creo la tabla */
+ for (i = 0; i < 256; ++i) if (freqtable[i] > 0) nonzero++;
+ inputlist = (SHUFFNODE*)malloc(sizeof(SHUFFNODE)*nonzero);
+
+ /* Cargo la inputlist del huffman solo con freqs > 0 */
+ for (i = 0; i < 256; ++i)
+ if (freqtable[i] > 0) {
+ inputlist[j].symbol = i;
+ inputlist[j].freq = freqtable[i];
+ inputlist[j].lchild = NULL;
+ inputlist[j].rchild = NULL;
+ j++;
+ }
+
+ *nonzerofreqs = nonzero;
+ return inputlist;
}
-void printcodes(CODE *codetable,t_freq *freqtable)
+SHUFFNODE *shuff_buildtree(t_freq *ftable)
+{
+ SHUFFNODE *lastsymbol;
+ SHUFFNODE *node1,*node2,*root;
+ SHUFFNODE *inputlist;
+ int freqcount = 0;
+
+ /* 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(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));
+ shuff_cpynode(node1,lastsymbol-1);
+ shuff_cpynode(node2,lastsymbol);
+ lastsymbol -= 1;
+ /* Nodo ficticio con la suma de las probs y los ptros a childs */
+ lastsymbol->symbol = 256;
+ lastsymbol->freq = node1->freq + node2->freq;
+ lastsymbol->lchild = node1;
+ lastsymbol->rchild = node2;
+ --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 root;
+}
+
+void shuff_printcodes(SHUFFCODE *codetable,t_freq *freqtable)
{
int i,j;
unsigned short int auxcode;
}
}
-void zerocodes(CODE *table)
+void shuff_zerocodes(SHUFFCODE *table)
{
int i;
- /* Inicializo los codigos prefijos */
+ /* Inicializo los codigos prefijos */
for (i = 0; i < 256; ++i) {
table[i].code = 0;
table[i].codelength = 0;
}
}
-void buildcodes(CODE *table, HUFFNODE *node, int level, int code)
+void shuff_buildcodes(SHUFFCODE *table, SHUFFNODE *node, int level, int code)
{
if (node->symbol < 256) {
/* Guardo el codigo en la tabla */
}
else {
code = code << 1;
- buildcodes(table,node->lchild,level+1,code);
+ shuff_buildcodes(table,node->lchild,level+1,code);
code |= 1;
- buildcodes(table,node->rchild,level+1,code);
+ shuff_buildcodes(table,node->rchild,level+1,code);
}
}
-HUFFNODE *buildtree(HUFFNODE *list, int listcount)
+int shuff_encode_symbols(HUFF_STATE *shuff, SHUFFCODE *ctable)
{
- HUFFNODE *lastsymbol = list+(listcount-1);
- HUFFNODE *node1,*node2,*fictnode;
-
- /* Ordenamos inicialmente la inputlist para tomar las dos freqs min */
- while (lastsymbol > list) {
- /* Ordeno la lista por frecuencia descendente */
- qsort(list,listcount,sizeof(HUFFNODE),compnode);
- /* Tomo los ultimos dos elementos, generando dos nodos del arbol */
- node1 = (HUFFNODE*)malloc(sizeof(HUFFNODE));
- node2 = (HUFFNODE*)malloc(sizeof(HUFFNODE));
- cpynode(node1,lastsymbol-1);
- cpynode(node2,lastsymbol);
- lastsymbol -= 1;
- /* Nodo ficticio con la suma de las probs y los ptros a childs */
- lastsymbol->symbol = 256;
- lastsymbol->freq = node1->freq + node2->freq;
- lastsymbol->lchild = node1;
- lastsymbol->rchild = node2;
- --listcount;
- }
-
- /* Devuelvo el puntero a la raiz del arbol de huffman */
- return lastsymbol;
-}
-
-int encode(CODE *table, char* inputfile, char *outputfile) {
-
- FILE *fpsource,*fpdest;
+ FILE *fpsource;
+ VFILE *fpdest;
int symbol,i;
+ unsigned long int sourcesize;
char bit;
- CODE symbolcode;
+ SHUFFCODE symbolcode;
- /* Abrimos el file */
- if ((fpsource = fopen(inputfile,"rb")) == NULL) return 0;
- if ((fpdest = fopen(outputfile,"wb")) == NULL) return 0;
+ /* Abrimos el source y el destino */
+ if (shuff->coderfp != NULL) fclose(shuff->coderfp); /* close bychunk temp file */
+ 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);
+ vfwrite(&sourcesize,sizeof(unsigned long int),1,fpdest);
+ vfwrite(shuff->freqtable,sizeof(t_freq),256,fpdest);
- while (!feof(fpsource)) {
+ /* Encodeo */
+ fseek(fpsource,0,SEEK_SET);
+ while (!feof(fpsource)) {
/* Levanto un symbolo (byte) */
symbol = fgetc(fpsource);
if (symbol == EOF) continue;
/* Cargamos el codigo y lo emitimos */
- symbolcode = table[symbol];
+ symbolcode = ctable[symbol];
for (i = symbolcode.codelength; i > 0; --i) {
bit = (symbolcode.code >> (i-1)) & 1;
putbit(bit,0,0,fpdest);
/* 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 main(int argc, char* argv[])
+int shuff_encode_file(HUFF_STATE *shuff)
+{
+ /* Locals */
+ SHUFFCODE *codetable = (SHUFFCODE*)malloc(sizeof(SHUFFCODE)*256);
+
+ /* Veo si debo armar una freqtable o si esta preloaded */
+ if (!shuff->preloadfreq) if (!shuff_scanfreq(shuff->sourcefile,shuff->freqtable)) return 0;
+
+ /* Genero el arbol de huffman */
+ shuff->codetree = shuff_buildtree(shuff->freqtable);
+
+ /* Armo la tabla de codigos prefijos para el encoder */
+ shuff_zerocodes(codetable);
+ shuff_buildcodes(codetable,shuff->codetree,0,0);
+ /*shuff_printcodes(codetable,shuff->freqtable);*/
+
+ /* Encodeo byte per byte */
+ shuff_encode_symbols(shuff,codetable);
+
+ /* Free up memory baby yeah */
+ 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_chunk(HUFF_STATE *shuff, char *chunk, int chunksize, int *decodedbytes)
+{
+ SHUFFNODE *currnode = shuff->codetree;
+ unsigned short int decoded_symbol;
+ *decodedbytes = 0;
+
+ while (!vfeof(shuff->decoderfp) && (shuff->bytesleft > 0) && (*decodedbytes < chunksize)) {
+
+ /* Leo un buffer de 32 bits si es que quedo vacio el anterior */
+ if (shuff->bitsleft == 0) {
+ if (vfread(&(shuff->codebuffer),sizeof(unsigned long int),1,shuff->decoderfp) != 1) continue;
+ shuff->bitsleft = sizeof(unsigned long int) * 8;
+ }
+
+ /* Proceso el buffer sacando simbolos till se me agote el buffer, file o chunk */
+ while ((shuff->bitsleft > 0) && (shuff->bytesleft > 0) && (*decodedbytes < chunksize)) {
+ currnode = shuff_decode_symbols(currnode,shuff->codebuffer,&(shuff->bitsleft),&decoded_symbol);
+ /* Si obtuve un symbolo valido lo emito*/
+ if (decoded_symbol != 256) {
+ chunk[(*decodedbytes)++] = decoded_symbol;
+ currnode = shuff->codetree;
+ --(shuff->bytesleft);
+ }
+ }
+ }
+
+ if (shuff->bytesleft == 0) return 0;
+ else return 1;
+}
+
+int shuff_decode_file(HUFF_STATE *shuff)
+{
+ SHUFFNODE *currnode;
+ unsigned long int codebuffer;
+ FILE *fpdest;
+ unsigned short int decoded_symbol;
+ int bitsleft;
+
+ /* Comienzo a decodificar, pues la tabla ya la levante en el decinit */
+ if ((fpdest = fopen(shuff->targetfile,"w")) == NULL) return 0;
+ currnode = shuff->codetree;
+
+ while (!vfeof(shuff->decoderfp) && (shuff->bytesleft > 0)) {
+
+ /* Leo un buffer de 32 bits */
+ if (vfread(&codebuffer,sizeof(unsigned long int),1,shuff->decoderfp) != 1) continue;
+ bitsleft = sizeof(unsigned long int) * 8;
+
+ /* Proceso el buffer sacando simbolos hasta que se me agote */
+ while ((bitsleft > 0) && (shuff->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 = shuff->codetree;
+ --(shuff->bytesleft);
+ }
+ }
+ }
+
+ /* Close destination */
+ fclose(fpdest);
+
+ return 1;
+}
+
+HUFF_STATE *shuff_init_decoder(char *inputfile, char *outputfile)
{
/* Locals */
- t_freq *freqtable = (t_freq*)malloc(sizeof(t_freq)*256);
- HUFFNODE *inputlist;
- HUFFNODE *codetree;
- CODE *codetable = (CODE*)malloc(sizeof(CODE)*256);
- int freqcount = 0,i;
+ HUFF_STATE *shuff = (HUFF_STATE*)malloc(sizeof(HUFF_STATE));
+ shuff->freqtable = (t_freq*)malloc(sizeof(t_freq)*256);
- if (argc == 1) return -1;
+ /* Init fields */
+ shuff->codebuffer = 0;
+ shuff->bitsleft = 0;
+ shuff->coderfp = NULL;
+ shuff->targetfile = NULL;
+ shuff->sourcefile = (char*)malloc(sizeof(char)*(strlen(inputfile)+1));
+ strcpy(shuff->sourcefile,inputfile);
+ if (outputfile != NULL) {
+ shuff->targetfile = (char*)malloc(sizeof(char)*(strlen(outputfile)+1));
+ strcpy(shuff->targetfile,outputfile);
+ }
- /* Armamos la tabla de frecuencias */
- if (!scanfreq(argv[1],freqtable)) return -1;
+ /* Levanto cuantos bytes decodeo y la freq table */
+ if ((shuff->decoderfp = vfopen(shuff->sourcefile,"r",0)) == NULL) return 0;
+ vfread(&(shuff->bytesleft),sizeof(unsigned long int),1,shuff->decoderfp);
+ vfread(shuff->freqtable,sizeof(unsigned long int),256,shuff->decoderfp);
+ shuff->codetree = shuff_buildtree(shuff->freqtable);
- /* Armo el input list y genero el arbol de huffman */
- inputlist = buildlist(freqtable, &freqcount);
- codetree = buildtree(inputlist,freqcount);
- /* Armo la tabla de codigos prefijos para el encoder */
- zerocodes(codetable);
- buildcodes(codetable,codetree,0,0);
- printcodes(codetable,freqtable);
- encode(codetable,argv[1],"output.dat");
+ return shuff;
+}
+
+HUFF_STATE *shuff_init_encoder_byfile(char *inputfile, char *outputfile, long volsize)
+{
+ /* Locals */
+ HUFF_STATE *fshuff = (HUFF_STATE*)malloc(sizeof(HUFF_STATE));
+ int i;
- return 0;
+ /* Inicializo la estructura para trabajar con Huff Static by File */
+ fshuff->coderfp = NULL;
+ fshuff->decoderfp = 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->volsize = volsize;
+ fshuff->preloadfreq = 0;
+ fshuff->freqtable = (t_freq*)malloc(sizeof(t_freq)*256);
+ for (i = 0; i < 256; ++i) fshuff->freqtable[i] = 0;
+ fshuff->sumfreq = 0;
+ fshuff->bytesleft = 0;
+ fshuff->codetree = NULL;
+
+ return fshuff;
+}
+
+HUFF_STATE *shuff_init_encoder_bychunk(char *outputfile, long volsize)
+{
+ /* Locals */
+ HUFF_STATE *cshuff = (HUFF_STATE*)malloc(sizeof(HUFF_STATE));
+ int i;
+
+ /* Inicializo la estructura para trabajar con Huff Static by Chunks */
+ cshuff->decoderfp = NULL;
+ 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->freqtable = (t_freq*)malloc(sizeof(t_freq)*256);
+ for (i = 0; i < 256; ++i) cshuff->freqtable[i] = 0;
+ cshuff->sumfreq = 0;
+ cshuff->bytesleft = 0;
+ cshuff->codetree = NULL;
+
+ /* Abrimos un archivo temporal para ir tirando los chunks */
+ if ((cshuff->coderfp = fopen(cshuff->sourcefile,"w")) == NULL) return NULL;
+
+ return cshuff;
+}
+
+void shuff_deinit_encoder(HUFF_STATE *shuff)
+{
+ /* Libero mallocs y cierro archivos */
+ free(shuff->freqtable);
+ if (shuff->coderfp != NULL) fclose(shuff->coderfp);
+ if (shuff->preloadfreq == 1) unlink(shuff->sourcefile);
+ if (shuff->targetfile != NULL) free(shuff->targetfile);
+ free(shuff->sourcefile);
+
+ /* Destruyo recursivamente el arbol de codigos */
+}
+
+void shuff_deinit_decoder(HUFF_STATE *shuff)
+{
+ /* Libero mallocs y cierro archivos */
+ free(shuff->freqtable);
+ free(shuff->sourcefile);
+ if (shuff->targetfile != NULL) free(shuff->targetfile);
+ if (shuff->decoderfp != NULL) vfclose(shuff->decoderfp);
+
+ /* Destruyo recursivamente el arbol de codigos */
}
projects / z.facultad / 75.06 / jacu.git / blobdiff