X-Git-Url: https://git.llucax.com/z.facultad/75.06/jacu.git/blobdiff_plain/3049ab6329e341f04df98e6605d1b017f09e219e..581c6c4f1d70b1928ae2946aa0482a4d36ea56d9:/src/jacu.c

diff --git a/src/jacu.c b/src/jacu.c
index bc95e0a..042a332 100644
--- a/src/jacu.c
+++ b/src/jacu.c
@@ -10,7 +10,17 @@
 #include <stdio.h>
 #include <unistd.h>
 
-long get_file_size(const char* filename);
+long fsize(const char* filename);
+
+/* Flags del archivo comprimido */
+#define FLAGS_ZG 0x1
+#define FLAGS_WS 0x2
+#define FLAGS_RESERVED_1 0x4
+#define FLAGS_RESERVED_2 0x8
+#define FLAGS_RESERVED_3 0x16
+#define FLAGS_RESERVED_4 0x64
+#define FLAGS_RESERVED_5 0x128
+#define FLAGS_RESERVED_6 0x255
 
 typedef struct _flags_ {
 	int cflag;
@@ -20,11 +30,27 @@ typedef struct _flags_ {
 	int qflag;
 	int sflag;
 	int mflag;
+	int rflag; /* Richard Dictionary :-) */
 } t_Flags;
 
-int comprimir(char *src, char *dst, Uint32 pagesize, Uint32 volumensize, t_Flags *flags, char *staticmodel);
+int comprimir(char *src, char *dst, Uint32 pagesize, Uint32 volumesize, t_Flags *flags, char *staticmodel);
 int descomprimir(char *src, char *dst);
 
+char is_flags_on(unsigned char flags, unsigned char flag)
+{
+	return (flags & flag);
+}
+
+char flag_on(unsigned char flags, unsigned char flag)
+{
+	return (flags | flag);
+}
+
+char flag_off(unsigned char flags, unsigned char flag)
+{
+	return (flags & (~flag));
+}
+
 int main(int argc, char* argv[])
 {	
 	long int volumesize = 0;
@@ -35,7 +61,7 @@ int main(int argc, char* argv[])
 			
 	memset(&flags, 0, sizeof(t_Flags));
 
-	while ((ch = getopt(argc, argv, "scdzm:t:q:")) != -1) { 
+	while ((ch = getopt(argc, argv, "rscdzm:t:q:")) != -1) { 
 		 
 		switch (ch) { 
 			case 'c': flags.cflag = 1; 
@@ -58,6 +84,8 @@ int main(int argc, char* argv[])
 				volumesize = atol(optarg);
 				break; 
 
+			case 'r': flags.rflag = 1;
+				break;
 			case 'q': flags.qflag = 1; 
 				switch (atoi(optarg))
 				{
@@ -85,13 +113,13 @@ int main(int argc, char* argv[])
 				}
 				break; 
 
-			default: fprintf(stderr, "Usage: %s [-cdzs][-q blksize][-t volsize][-m modeldumpfile] source target\n", argv[0]); 
+			default: fprintf(stderr, "Usage: %s [-cdzsr][-q blksize][-t volsize][-m modeldumpfile] source target\n", argv[0]); 
 					 return(2);
 		}
 	}
 		
 	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]); 
+		fprintf(stderr, "Usage: %s [-cdzsr][-q compressionquality][-t volsize][-m modeldumpfile] source target\n", argv[0]); 
 		return (3);
 	}
 	if ((flags.tflag) && (volumesize <= 0l)) {
@@ -114,7 +142,7 @@ int main(int argc, char* argv[])
 	return 0;
 }
 
-long get_file_size(const char* filename)
+long fsize(const char* filename)
 {
 	FILE* file;
 	long  file_size;
@@ -135,8 +163,12 @@ int comprimir(char *src, char *dst, Uint32 pagesize, Uint32 volumesize, t_Flags
 	unsigned char *mtf;
 	unsigned char *salida, *data;
 	unsigned char *z;
+	unsigned char file_flags = 0;
 	int z_len;
 	
+	/* Abrimos el archivo a comprimir y encodeamos bloques */
+	if ((fp = fopen(src, "rb")) == NULL) return 1;
+	
 	/* Preparo el compresor huffman */
 	if ((shuff = shuff_init_encoder_bychunk(dst, volumesize*1024)) == NULL) return 1;
 	if (flags->mflag == 1) shuff_loadmodel(shuff, staticmodel);
@@ -146,28 +178,23 @@ int comprimir(char *src, char *dst, Uint32 pagesize, Uint32 volumesize, t_Flags
 	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);
+		file_flags = flag_on(file_flags, FLAGS_ZG);
+	if (flags->rflag)
+		file_flags = flag_on(file_flags, FLAGS_WS);
+
+	shuff_scanfreq_chunk(shuff, &file_flags, 1);
 
 	total = 0;
 	while (!feof(fp)) {
 		i = 0;
-		while ((!feof(fp)) && (i < pagesize)) {
-			data[i++] = fgetc(fp);
-			total++;
-		}
+		i = bs_readblock(fp, data, pagesize, flags->rflag);
+		total += i;
 
-		/* Saco un EOF que lee de mas */
-		if (i<pagesize) i--;
 
 		/* Aplico BS guardando su resultado + el K en salida */
 		bs_solve(data, salida, bs, &k, i);
@@ -184,8 +211,8 @@ int comprimir(char *src, char *dst, Uint32 pagesize, Uint32 volumesize, t_Flags
 			Uint32 len;
 			unsigned char buff[2];
 			Uint32 total_size = i + sizeof(Uint32);
-			ZG zg;				
-			/* Guardo la salida del MTF con ceros agrupados (ZG) */				
+			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])))
@@ -193,18 +220,20 @@ int comprimir(char *src, char *dst, Uint32 pagesize, Uint32 volumesize, t_Flags
 
 				/* Flusheo ultimo zgrouping */
 				if ((len = zg_group_finish(&zg,buff)))
-					shuff_scanfreq_chunk(shuff, buff, len);				
+					shuff_scanfreq_chunk(shuff, buff, len);
 		} else {
-			/* Comprimo la salida del MTF */				
-			shuff_scanfreq_chunk(shuff,mtf,i+sizeof(Uint32));				
+			/* Comprimo la salida del MTF */
+			shuff_scanfreq_chunk(shuff,mtf,i+sizeof(Uint32));
 		}
 		free(mtf);
 		free(z);
 	}
 
 	/* Limpiando */
-	fclose(fp);		
+	if (fclose(fp)) fprintf(stderr, "Error al cerrar archivo de entrada!\n");
 	bs_destroy(bs);
+	free(data);
+	free(salida);
 
 	/* Comprimo con Huffman */		
 	shuff_encode_file(shuff);
@@ -214,7 +243,7 @@ int comprimir(char *src, char *dst, Uint32 pagesize, Uint32 volumesize, t_Flags
 	free(shuff);
 
 	/* Muestro bpb */
-	printf("%s: %.04f bit/byte.\n", dst, get_file_size(dst)*8.0f/get_file_size(src));
+	printf("%s: %.04f bits/byte.\n", dst, vfsize(dst)*8.0f/fsize(src));
 	return 0;
 }
 
@@ -222,13 +251,12 @@ int descomprimir(char *src, char *dst)
 {
 	/* Descomprimo */
 	FILE *fp_out;
-	Uint32 block_size = 0,zgungrouped = 0, k;
+	Uint32 block_size = 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;
+	unsigned char *z;
+	Uint32 z_len=0,moredata = 0,decoded = 0;
+	unsigned char file_flags = 0,retbytes = 0;
 	HUFF_STATE *shuff;
-	ZG zg;
 
 	/* Inicializo el descompresor */
 	if ((shuff = shuff_init_decoder(src, NULL)) == NULL) return 1;
@@ -240,11 +268,9 @@ int descomprimir(char *src, char *dst)
 	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);
+	if (!(moredata = shuff_decode_chunk(shuff, &file_flags, 1, &decoded))) return 1;
 
 	/* Creo buffers */
-	zgbuffer = malloc(sizeof(unsigned char)*256);
 	block = malloc(block_size*sizeof(unsigned char)+sizeof(Uint32));
 	orig = malloc(block_size*sizeof(unsigned char));
 
@@ -257,17 +283,22 @@ int descomprimir(char *src, char *dst)
 			moredata = shuff_decode_chunk(shuff,z,z_len,&decoded);				
 			
 			/* Veo si se uso Zero Grouping para comprimir */
-			if (use_zg) {																				
+			if (is_flags_on(file_flags, FLAGS_ZG)) {
+				ZG zg;
+				unsigned char zgbuffer[255];
+				unsigned char zgbyte = 0;
+				int zgmoved = 0;
+				Uint32 zgungrouped = 0;
 				/* Desagrupo bytes hasta completar la pagina or End of Source File */
-				zgungrouped = 0;					
-				do {																	
+				zg_init(&zg);
+				do {
 					/* Levanto un byte zerogrouped y lo paso por el zg_ungroup */
 					zgmoved = 0;
-					moredata = shuff_decode_chunk(shuff,&zgbyte,1,&decoded);																																				
+					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++];							
+					/* 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)));
 
@@ -276,17 +307,17 @@ int descomprimir(char *src, char *dst)
 					/* 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;					
+				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 */	
+			/* 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 */
@@ -295,19 +326,23 @@ int descomprimir(char *src, char *dst)
 			/* 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);
+			decoded -= sizeof(Uint32);
+			if (is_flags_on(file_flags, FLAGS_WS)) {
+				orig = bs_finalblock(orig, decoded, &decoded);
+			}
+
+			fwrite(orig, decoded, sizeof(unsigned char), fp_out);
 			free(mtf);
-			free(z);				
+			free(z);
 		}
 		else return 1;
-	} while (moredata);		
+	} 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);