X-Git-Url: https://git.llucax.com/z.facultad/75.06/jacu.git/blobdiff_plain/eb5347f4df35aaa5266fcbd04112ae4cc1cf41b1..bd0062922151710408edae80d0f67db20114c6c9:/src/jacu.c?ds=inline

diff --git a/src/jacu.c b/src/jacu.c
index baf28da..ce801b4 100644
--- a/src/jacu.c
+++ b/src/jacu.c
@@ -12,46 +12,53 @@
 
 long get_file_size(const char* filename);
 
+typedef struct _flags_ {
+	int cflag;
+	int dflag;
+	int zflag;
+	int tflag;
+	int qflag;
+	int sflag;
+	int mflag;
+} t_Flags;
+
+int comprimir(char *src, char *dst, Uint32 pagesize, Uint32 volumensize, t_Flags *flags, char *staticmodel);
+int descomprimir(char *src, char *dst);
+
 int main(int argc, char* argv[])
 {	
-	int cflag = 0;
-	int dflag = 0;
-	int zflag = 0;
-	int tflag = 0;
-	int qflag = 0;
-	int sflag = 0;
-	int mflag = 0;
 	long int volumesize = 0;
-	size_t pagesize = 32768; /* 32KB */
+	Uint32 pagesize = 32768; /* 32KB */
 	int ch;
-	t_BlockSort *bs;
-	HUFF_STATE *shuff;
+	t_Flags flags;
 	char *staticmodel = NULL;
 			
+	memset(&flags, 0, sizeof(t_Flags));
+
 	while ((ch = getopt(argc, argv, "scdzm:t:q:")) != -1) { 
 		 
 		switch (ch) { 
-			case 'c': cflag = 1; 
+			case 'c': flags.cflag = 1; 
 					  break;
 
-			case 'd': dflag = 1; 
+			case 'd': flags.dflag = 1; 
 					  break; 
 
-			case 'z': zflag = 1; 
+			case 'z': flags.zflag = 1; 
 					  break; 
 			
-			case 'm': mflag = 1;
+			case 'm': flags.mflag = 1;
 					  staticmodel = optarg;
 					  break; 
 			
-			case 's': sflag = 1; 					  
+			case 's': flags.sflag = 1; 					  
 					  break;
 
-			case 't': tflag = 1; 
+			case 't': flags.tflag = 1; 
 				volumesize = atol(optarg);
 				break; 
 
-			case 'q': qflag = 1; 
+			case 'q': flags.qflag = 1; 
 				switch (atoi(optarg))
 				{
 					case 0: pagesize = 1024; /* 1K */
@@ -83,159 +90,226 @@ int main(int argc, char* argv[])
 		}
 	}
 		
-	if ( (argc == 1) || (cflag & dflag) || !(cflag | dflag) || ((argc - optind) < 2) || (mflag & sflag)) {
-		fprintf(stderr, "Usage: %s [-cdzs][-q blksize][-t volsize][-m modeldumpfile] source target\n", argv[0]); 
+	if ( (argc == 1) || (flags.cflag & flags.dflag) || !(flags.cflag | flags.dflag) || ((argc - optind) < 2) || (flags.mflag & flags.sflag)) {
+		fprintf(stderr, "Usage: %s [-cdzs][-q compressionquality][-t volsize][-m modeldumpfile] source target\n", argv[0]); 
 		return (3);
 	}
-	if ((tflag) && (volumesize <= 0l)) {
+	if ((flags.tflag) && (volumesize <= 0l)) {
 		fprintf(stderr,"Error: The volume size must be a non-zero value\n");
 		return (4);
 	}
-	if ((qflag) && (pagesize <= 1u)) {
+	if ((flags.qflag) && (pagesize <= 1u)) {
 		fprintf(stderr,"Error: El nivel de compresión debe ser entre 0 (menor) y 9 (mayor).\n");
 		return (5);
 	}
 		
-	if (cflag == 1) {
-		/* Comprimo */		
-		FILE *fp;
-		Uint32 i, j, total, k;
-		unsigned char *mtf;
-		unsigned char *salida, *data;
-		unsigned char *z;
-		int z_len;
-		
-		/* Preparo el compresor huffman */
-		if ((shuff = shuff_init_encoder_bychunk(argv[optind+1],volumesize*1024)) == NULL) return 0;
-		if (mflag == 1) shuff_loadmodel(shuff,staticmodel);
-		
-		/* Preparo el BS alocando mem para el K, el Block y su Size */
-		data = malloc(sizeof(unsigned char)*pagesize);
-		salida = malloc(sizeof(unsigned char)*pagesize+sizeof(Uint32)*2);
-		bs = bs_create(pagesize);
-
-		/* Abrimos el archivo a comprimir y encodeamos bloques */
-		fp = fopen(argv[optind], "rb");						
-
-		total = 0;
-		while (!feof(fp)) {
-			i = 0;
-			while ((!feof(fp)) && (i < pagesize)) {
-				data[i++] = fgetc(fp);
-				total++;
-			}
+	if (flags.cflag == 1) {
+		return comprimir(argv[optind], argv[optind+1], pagesize, volumesize, &flags, staticmodel);
+	}
+	
+	if (flags.dflag == 1) { 
+		return descomprimir(argv[optind], argv[optind+1]);
+	}
 
-			/* Saco un EOF que lee de mas */
-			if (i<pagesize) i--;
+	return 0;
+}
 
-			/* Aplico el BlockSorting */
-			bs_solve(data, salida, bs, &k, i);
+long get_file_size(const char* filename)
+{
+	FILE* file;
+	long  file_size;
 
-			/* Le aplico el MTF, salteo el tamaño del bloque para que no se pierda. */
-			mtf = jacu_mtf(salida+sizeof(Uint32), i+sizeof(Uint32), &z, &z_len);
-			
-			/* Si me lo piden, aplico ZG. */
-			if (zflag) {
-				size_t len;
-				char buff[2];
-				ZG zg;
-				zg_init(&zg);
-				/* TODO HACER LO MISMO QUE EN EL ELSE XXX */
-				for (j = 0; j < i; ++j)
-					if ((len = zg_group(&zg, buff, mtf[j]))) shuff_scanfreq_chunk(shuff,buff,len);
-			} else {
-				/* Guardo el PageSize */
-				shuff_scanfreq_chunk(shuff,salida,sizeof(Uint32));
-				
-				/* Guardo el Z len y el Z */
-				shuff_scanfreq_chunk(shuff,(char*)&z_len,sizeof(int));
-				shuff_scanfreq_chunk(shuff,z,z_len);								
+	if (!(file = fopen(filename, "ab"))) return -1;
+	file_size = ftell(file);
+	fclose(file);
+	return file_size;
+}
 
-				/* Guardo la salida del MTF */				
-				shuff_scanfreq_chunk(shuff,mtf,i+sizeof(Uint32));				
-			}
-			free(mtf);
-			free(z);
+int comprimir(char *src, char *dst, Uint32 pagesize, Uint32 volumesize, t_Flags *flags, char *staticmodel)
+{
+	/* Comprimo */		
+	t_BlockSort *bs;
+	HUFF_STATE *shuff;
+	FILE *fp;
+	Uint32 i, j, total, k;
+	unsigned char *mtf;
+	unsigned char *salida, *data;
+	unsigned char *z;
+	int z_len;
+	
+	/* Preparo el compresor huffman */
+	if ((shuff = shuff_init_encoder_bychunk(dst, volumesize*1024)) == NULL) return 1;
+	if (flags->mflag == 1) shuff_loadmodel(shuff, staticmodel);
+	
+	/* Preparo el BS alocando mem para la Salida: V(vector) + K(colnum) */
+	data = malloc(sizeof(unsigned char)*pagesize);
+	salida = malloc(sizeof(unsigned char)*pagesize+sizeof(Uint32));
+	bs = bs_create(pagesize);
+
+	/* Abrimos el archivo a comprimir y encodeamos bloques */
+	fp = fopen(src, "rb");
+
+	/* Guardamos el pagesize como header (huffencoded) */
+	shuff_scanfreq_chunk(shuff,(char*)&pagesize,sizeof(Uint32));
+
+	/* Guardamos cabecera para indicar si usamos ZG (huffencoded) */
+	if (flags->zflag)
+		shuff_scanfreq_chunk(shuff, "\001", 1);
+	else
+		shuff_scanfreq_chunk(shuff, "\000", 1);
+
+	total = 0;
+	while (!feof(fp)) {
+		i = 0;
+		while ((!feof(fp)) && (i < pagesize)) {
+			data[i++] = fgetc(fp);
+			total++;
 		}
 
-		/* Limpiando */
-		fclose(fp);		
-		bs_destroy(bs);
+		/* Saco un EOF que lee de mas */
+		if (i<pagesize) i--;
 
-		/* Comprimo con Huffman */		
-		shuff_encode_file(shuff);
-		if (sflag == 1) shuff_savemodel(shuff);
-		/* Shutdown Huffman */
-		shuff_deinit_encoder(shuff);
-		free(shuff);
+		/* Aplico BS guardando su resultado + el K en salida */
+		bs_solve(data, salida, bs, &k, i);
 
-		/* Muestro bpb */
-		printf("Comprimido a %.04f bpb.\n", get_file_size(argv[optind+1])*8.0/get_file_size(argv[optind]));
-		return 0;
-	}
-	
-	if (dflag == 1) { 
-		/* Descomprimo */
-		FILE *fp_out;
-		/*FILE *fp_in;*/
-		Uint32 block_size, k;
-		unsigned char *block, *mtf, *orig;
-		unsigned char *z;
-		int z_len,moredata = 0,decoded = 0;
-
-		/* Inicializo el descompresor */
-		if ((shuff = shuff_init_decoder(argv[optind],NULL)) == NULL) return 1;
+		/* Le aplico el MTF a salida */
+		mtf = jacu_mtf(salida, i+sizeof(Uint32), &z, &z_len);
 				
-		/* Abrimos el archivo de salida */
-		fp_out = fopen(argv[optind+1], "wb");
-
-		/* Descomprimimos de a chunks segun convenga */
-		do {
-			block_size = 0;						
-			moredata = shuff_decode_chunk(shuff,(char*)&block_size,sizeof(Uint32),&decoded);
-			if (block_size > 0) {
-				moredata = shuff_decode_chunk(shuff,(char*)&z_len,sizeof(int),&decoded);				
-				z = malloc(sizeof(unsigned char)*z_len);
-				moredata = shuff_decode_chunk(shuff,z,z_len,&decoded);				
-
-				block = malloc(block_size*sizeof(unsigned char)+sizeof(Uint32));
-				orig = malloc(block_size*sizeof(unsigned char));
-				moredata = shuff_decode_chunk(shuff,block,block_size+sizeof(Uint32),&decoded);				
-
-				mtf = jacu_mtf_inv(z, block, block_size*sizeof(unsigned char)+sizeof(Uint32));
-
-				/* Luego de hacer el MTF inverso ya puedo recuperar el k */
-				memcpy(&k, mtf, sizeof(Uint32));
-
-				/*printf("Restored : k=%ld\n", k);*/
-				bs_restore(orig, mtf+sizeof(Uint32), k, block_size);
-
-				fwrite(orig, block_size, sizeof(unsigned char), fp_out);
-				free(block);
-				free(orig);
-				free(mtf);
-				free(z);
-			}
-		} while (moredata);		
+		/* Guardo el z_len y el Z */
+		shuff_scanfreq_chunk(shuff,(char*)&z_len,sizeof(int));
+		shuff_scanfreq_chunk(shuff,z,z_len);			
 		
-		/* Close up files */
-		fclose(fp_out);
-		
-		/* Shutdown Huffman */
-		shuff_deinit_decoder(shuff);
-		free(shuff);
+		/* Si me lo piden, aplico ZG. */
+		if (flags->zflag) {
+			Uint32 len;
+			unsigned char buff[2];
+			Uint32 total_size = i + sizeof(Uint32);
+			ZG zg;				
+			/* Guardo la salida del MTF con ceros agrupados (ZG) */				
+			zg_init(&zg);
+			for (j = 0; j < total_size; ++j)
+				if ((len = zg_group(&zg, buff, mtf[j])))
+					shuff_scanfreq_chunk(shuff, buff, len);
+
+				/* Flusheo ultimo zgrouping */
+				if ((len = zg_group_finish(&zg,buff)))
+					shuff_scanfreq_chunk(shuff, buff, len);				
+		} else {
+			/* Comprimo la salida del MTF */				
+			shuff_scanfreq_chunk(shuff,mtf,i+sizeof(Uint32));				
+		}
+		free(mtf);
+		free(z);
 	}
 
+	/* Limpiando */
+	fclose(fp);		
+	bs_destroy(bs);
+
+	/* Comprimo con Huffman */		
+	shuff_encode_file(shuff);
+	if (flags->sflag == 1) shuff_savemodel(shuff);
+	/* Shutdown Huffman */
+	shuff_deinit_encoder(shuff);
+	free(shuff);
+
+	/* Muestro bpb */
+	printf("%s: %.04f bits/byte.\n", dst, get_file_size(dst)*8.0f/get_file_size(src));
 	return 0;
 }
 
-long get_file_size(const char* filename)
+int descomprimir(char *src, char *dst)
 {
-	FILE* file;
-	long  file_size;
+	/* Descomprimo */
+	FILE *fp_out;
+	Uint32 block_size = 0,zgungrouped = 0, k;
+	unsigned char *block, *mtf, *orig;
+	unsigned char *z, *zgbuffer;
+	int zgmoved = 0,z_len=0,moredata = 0,decoded = 0;
+	unsigned char use_zg = 0,zgbyte = 0,retbytes = 0;
+	HUFF_STATE *shuff;
+	ZG zg;
 
-	if (!(file = fopen(filename, "ab"))) return -1;
-	file_size = ftell(file);
-	fclose(file);
-	return file_size;
+	/* Inicializo el descompresor */
+	if ((shuff = shuff_init_decoder(src, NULL)) == NULL) return 1;
+			
+	/* Abrimos el archivo de salida */
+	fp_out = fopen(dst, "wb");
+	
+	/* Descomprimo primero que nada el pagesize utilizado para comprimir */
+	if (!(moredata = shuff_decode_chunk(shuff,(char*)&block_size,sizeof(Uint32),&decoded))) return 1;
+
+	/* Descomprimo byte que indica si se usa ZG */
+	if (!(moredata = shuff_decode_chunk(shuff, &use_zg, 1, &decoded))) return 1;
+	if (use_zg) zg_init(&zg);
+
+	/* Creo buffers */
+	zgbuffer = malloc(sizeof(unsigned char)*256);
+	block = malloc(block_size*sizeof(unsigned char)+sizeof(Uint32));
+	orig = malloc(block_size*sizeof(unsigned char));
+
+	/* Descomprimimos de a chunks segun convenga */
+	do {			
+		if (block_size > 0) {
+			/* Descomprimo el Zlen y el Z del MTF*/
+			moredata = shuff_decode_chunk(shuff,(char*)&z_len,sizeof(int),&decoded);					
+			z = malloc(sizeof(unsigned char)*z_len);
+			moredata = shuff_decode_chunk(shuff,z,z_len,&decoded);				
+			
+			/* Veo si se uso Zero Grouping para comprimir */
+			if (use_zg) {																				
+				/* Desagrupo bytes hasta completar la pagina or End of Source File */
+				zgungrouped = 0;					
+				do {																	
+					/* Levanto un byte zerogrouped y lo paso por el zg_ungroup */
+					zgmoved = 0;
+					moredata = shuff_decode_chunk(shuff,&zgbyte,1,&decoded);																																				
+					retbytes = zg_ungroup(&zg,zgbuffer,zgbyte);
+					/* Muevo del zgbuffer a mi bloque lo que corresponda */						
+					while ((zgmoved < retbytes) && (zgungrouped < block_size+sizeof(Uint32))) {							
+						block[zgungrouped++] = zgbuffer[zgmoved++];							
+					}
+				} while ((moredata) && (zgungrouped < block_size+sizeof(Uint32)));
+
+				/* Me fijo si el ultimo byte procesado que me completo la pagina fue un 0 */
+				if (zgbyte == 0) {
+					/* Leo un byte mas (un 0 seguro) y zg_ungroup cambiara su estado */
+					moredata = shuff_decode_chunk(shuff,&zgbyte,1,&decoded);
+					zg_ungroup(&zg,zgbuffer,zgbyte);
+				}						
+
+				/* Normalizo variables para continuar en common code */
+				decoded = zgungrouped;					
+			}
+			else {
+				/* Levanto una salida de MTF */
+				moredata = shuff_decode_chunk(shuff,block,block_size+sizeof(Uint32),&decoded);
+			}
+			
+			/* Le aplico MTF inverso a la salida de MTF levantada previamente */	
+			mtf = jacu_mtf_inv(z, block, decoded);
+
+			/* Ya tengo la salida del BS, tonces levanto su K */
+			memcpy(&k, mtf, sizeof(Uint32));
+
+			/* Obtengo el chunk original aplicando BS Inverso */
+			bs_restore(orig, mtf+sizeof(Uint32), k, decoded - sizeof(Uint32));
+
+			fwrite(orig, decoded - sizeof(Uint32), sizeof(unsigned char), fp_out);
+			free(mtf);
+			free(z);				
+		}
+		else return 1;
+	} while (moredata);		
+	
+	/* Close up files and free mem */
+	fclose(fp_out);
+	free(block);
+	free(orig);
+	free(zgbuffer);
+	
+	/* Shutdown Huffman */
+	shuff_deinit_decoder(shuff);
+	free(shuff);
+	return 0;
 }