zlib support; also internal compression changes

o Add support for zlib compression via ZLIB_COMP in config.h (ZLIB_COMP
  and COMPRESS are mutually exclusive).
o rlecomp and zerocomp are run time options available if RLECOMP and
  ZEROCOMP are defined, but not turned on by default if either COMPRESS
  or ZLIB_COMP are defined.
o Add information to the save file about internal compression options
  used when writing the save file, particularly rlecomp and zerocomp
  support.
o Automatically adjust rlecomp and zerocomp (if support compiled in)
  when reading in an existing savefile that was saved with those options
  turned on.  Still allows writing out of savefile in preferred format.
o In order to support zlib and not conflict with compress and uncompress
  routines there, the NetHack internal functions were changed to
  nh_uncompress and nh_compress as done in the zlib contribution received
  in 1999 from <Someone>.

I tagged the sources NETHACK_3_5_0_PREZLIB prior to applying these
changes.

doc/Guidebook.mn

@@ -2086,6 +2086,10 @@ of specifying your role.  Normally only the first letter of the
 value is examined; `r' is an exception with ``Rogue'', ``Ranger'',
 and ``random'' values. If you prefix a `!' or ``no'' to the value, you can 
 exclude that role from being picked randomly.
+.lp rlecomp
+When writing out a save file, perform run length compression of level 
+structures. Not all ports support run length compression. It has no
+effect on reading an existing save file.
 .lp runmode
 Controls the amount of screen updating for the map window when engaged
 in multi-turn movement (running via shift+direction or control+direction
@@ -2173,6 +2177,10 @@ Provide more commentary during the game (default on).
 Select which windowing system to use, such as ``tty'' or ``X11''
 (default depends on version).
 Cannot be set with the `O' command.
+.lp zerocomp
+When writing out a save file, perform zero-comp compression of the 
+contents. Not all ports support zero-comp compression. It has no effect 
+on reading an existing save file.
 .hn 2
 Window Port Customization options
 .pg

doc/Guidebook.tex

@@ -27,7 +27,7 @@
 \begin{document}
 %
 % input file: guidebook.mn
-% $Revision: 1.89 $ $Date: 2005/01/09 21:40:02 $
+% $Revision: 1.90 $ $Date: 2005/01/16 03:57:39 $
 %
 %.ds h0 "
 %.ds h1 %.ds h2 \%
@@ -2554,6 +2554,11 @@ value is examined; `r' is an exception with ``{\tt Rogue}'', {\tt Ranger}'',
 and ``{\tt random}'' values. If you prefix `{\tt !}' or ``{\tt no}'' to the 
 value, you can exclude that role from being picked randomly.
 %.lp
+\item[\ib{rlecomp}]
+When writing out a save file, perform run length compression of level 
+structures. Not all ports support run length compression. It has no
+effect on reading an existing save file.
+%.lp
 \item[\ib{runmode}]
 Controls the amount of screen updating for the map window when engaged
 in multi-turn movement (running via {\tt shift}+direction
@@ -2658,6 +2663,11 @@ Provide more commentary during the game (default on).
 Select which windowing system to use, such as ``{\tt tty}'' or ``{\tt X11}''
 (default depends on version).
 Cannot be set with the `{\tt O}' command.
+%.lp
+\item[\ib{zerocomp}]
+When writing out a save file, perform zero-comp compression of the 
+contents. Not all ports support zero-comp compression. It has no effect 
+on reading an existing save file.
 \elist
 
 %.hn 2

include/config.h

@@ -159,18 +159,22 @@
 
 /*
  *	If COMPRESS is defined, it should contain the full path name of your
- *	'compress' program.  Defining INTERNAL_COMP causes NetHack to do
- *	simpler byte-stream compression internally.  Both COMPRESS and
- *	INTERNAL_COMP create smaller bones/level/save files, but require
- *	additional code and time.  Currently, only UNIX fully implements
- *	COMPRESS; other ports should be able to uncompress save files a
- *	la unixmain.c if so inclined.
+ *	'compress' program.
+ *
  *	If you define COMPRESS, you must also define COMPRESS_EXTENSION
  *	as the extension your compressor appends to filenames after
- *	compression.
+ *	compression. Currently, only UNIX fully implements
+ *	COMPRESS; other ports should be able to uncompress save files a
+ *	la unixmain.c if so inclined.
+ *
+ *	Defining ZLIB_COMP builds in support for zlib compression. If you
+ *	define ZLIB_COMP, you must link with a zlib library.
+ *
+ *	COMPRESS and ZLIB_COMP are mutually exclusive.
+ *
  */
  
-#ifdef UNIX
+#if defined(UNIX) && !defined(ZLIB_COMP) && !defined(COMPRESS)
 /* path and file name extension for compression program */
 #define COMPRESS "/usr/bin/compress"	/* Lempel-Ziv compression */
 #define COMPRESS_EXTENSION ".Z"		/* compress's extension */
@@ -180,9 +184,41 @@
 #endif
 
 #ifndef COMPRESS
-# define INTERNAL_COMP	/* control use of NetHack's compression routines */
+# define ZLIB_COMP			/* ZLIB for compression */
 #endif
 
+/*
+ *	Internal Compression Options
+ *
+ *	Internal compression options RLECOMP and ZEROCOMP alter the data
+ *	that gets written to the save file by NetHack, in contrast
+ *	to COMPRESS or ZLIB_COMP which compress the entire file after
+ *	the NetHack data is written out.
+ *
+ *	Defining RLECOMP builds in support for internal run-length
+ *	compression of level structures. If RLECOMP support is included
+ *	it can be toggled on/off at runtime via the config file option
+ *	rlecomp.
+ *
+ *	Defining ZEROCOMP builds in support for internal zero-comp
+ *	compression of data. If ZEROCOMP support is included it can still
+ *	be toggled on/off at runtime via the config file option zerocomp.
+ *
+ *	RLECOMP and ZEROCOMP support can be included even if
+ *	COMPRESS or ZLIB_COMP support is included. One reason for doing
+ *	so would be to provide savefile read compatibility with a savefile
+ *	where those options were in effect. With RLECOMP and/or ZEROCOMP
+ *	defined, NetHack can read an rlecomp or zerocomp savefile in, yet
+ *	re-save without them.
+ *
+ *	Using any compression option will create smaller bones/level/save
+ *	files at the cost of additional code and time.
+ */
+
+/* # define INTERNAL_COMP	*/	/* Forces both ZEROCOMP and RLECOMP */
+/* # define ZEROCOMP		*/	/* Support ZEROCOMP compression */
+/* # define RLECOMP		*/	/* Support RLECOMP compression  */
+
 /*
  *	Data librarian.  Defining DLB places most of the support files into
  *	a tar-like file, thus making a neater installation.  See *conf.h

include/decl.h

@@ -381,6 +381,8 @@ E char *fqn_prefix[PREFIX_COUNT];
 E char *fqn_prefix_names[PREFIX_COUNT];
 #endif
 
+E NEARDATA struct savefile_info sfcap, sfrestinfo, sfsaveinfo;
+
 #ifdef AUTOPICKUP_EXCEPTIONS
 struct autopickup_exception {
 	char *pattern;

include/extern.h

@@ -673,8 +673,8 @@ E int NDECL(create_savefile);
 E int NDECL(open_savefile);
 E int NDECL(delete_savefile);
 E int NDECL(restore_saved_game);
-E void FDECL(compress, (const char *));
-E void FDECL(uncompress, (const char *));
+E void FDECL(nh_compress, (const char *));
+E void FDECL(nh_uncompress, (const char *));
 E boolean FDECL(lock_file, (const char *,int,int));
 E void FDECL(unlock_file, (const char *));
 #ifdef USER_SOUNDS
@@ -1751,14 +1751,14 @@ E void FDECL(getlev, (int,int,XCHAR_P,BOOLEAN_P));
 E void FDECL(get_plname_from_file, (int, char *));
 E void NDECL(minit);
 E boolean FDECL(lookup_id_mapping, (unsigned, unsigned *));
-#ifdef ZEROCOMP
-E int FDECL(mread, (int,genericptr_t,unsigned int));
-#else
 E void FDECL(mread, (int,genericptr_t,unsigned int));
-#endif
 #ifndef GOLDOBJ
 E void FDECL(put_gold_back, (struct obj **,long *));
 #endif
+E int FDECL(validate, (int,const char *));
+E void NDECL(reset_restpref);
+E void FDECL(set_restpref, (const char *));
+E void FDECL(set_savepref, (const char *));
 
 /* ### rip.c ### */
 
@@ -1835,10 +1835,15 @@ E void FDECL(bufoff, (int));
 E void FDECL(bflush, (int));
 E void FDECL(bwrite, (int,genericptr_t,unsigned int));
 E void FDECL(bclose, (int));
+E void FDECL(def_bclose, (int));
+#if defined(ZEROCOMP)
+E void FDECL(zerocomp_bclose, (int));
+#endif
 E void FDECL(savefruitchn, (int,int));
 E void FDECL(store_plname_in_file, (int));
 E void NDECL(free_dungeons);
 E void NDECL(freedynamicdata);
+E void FDECL(store_savefileinfo, (int));
 
 /* ### shk.c ### */
 

include/flag.h

@@ -164,6 +164,8 @@ struct instance_flags {
 	boolean  menu_tab_sep;	/* Use tabs to separate option menu fields */
 	boolean  menu_requested; /* Flag for overloaded use of 'm' prefix
 				  * on some non-move commands */
+	boolean  zerocomp;	/* write zero-compressed save files */
+	boolean  rlecomp;	/* run-length comp of levels when writing savefile */
 	uchar num_pad_mode;
 	int	menu_headings;	/* ATR for menu headings */
 	int      purge_monsters;	/* # of dead monsters still on fmon list */

include/global.h

@@ -305,6 +305,20 @@ struct version_info {
 	unsigned long	struct_sizes2;	/* size of more key structs */
 };
 
+struct savefile_info {
+	unsigned long	sfi1;	/* compression etc. */
+	unsigned long	sfi2;	/* miscellaneous */
+	unsigned long	sfi3;	/* thirdparty */
+};
+#ifdef NHSTDC
+#define SFI1_EXTERNALCOMP	(1UL)
+#define SFI1_RLECOMP		(1UL << 1)
+#define SFI1_ZEROCOMP		(1UL << 2)
+#else
+#define SFI1_EXTERNALCOMP	(1L)
+#define SFI1_RLECOMP		(1L << 1)
+#define SFI1_ZEROCOMP		(1L << 2)
+#endif
 
 /*
  * Configurable internal parameters.

src/bones.c

@@ -427,12 +427,14 @@ getbones()
 	fd = open_bonesfile(&u.uz, &bonesid);
 	if (fd < 0) return(0);
 
-	if ((ok = uptodate(fd, bones)) == 0) {
+	if (validate(fd, bones) != 0) {
 #ifdef WIZARD
 	    if (!wizard)
 #endif
 		pline("Discarding unuseable bones; no need to panic...");
+	    ok = FALSE;
 	} else {
+		ok = TRUE;
 #ifdef WIZARD
 		if(wizard)  {
 			if(yn("Get bones?") == 'n') {

src/decl.c

@@ -275,6 +275,52 @@ char *fqn_prefix_names[PREFIX_COUNT] = { "hackdir", "leveldir", "savedir",
 					"lockdir", "configdir", "troubledir" };
 #endif
 
+NEARDATA struct savefile_info sfcap = {
+#ifdef NHSTDC
+		0x00000000UL
+#else
+		0x00000000L
+#endif
+#if defined(COMPRESS) || defined(ZLIB_COMP)
+		| SFI1_EXTERNALCOMP
+#endif
+#if defined(ZEROCOMP)
+		| SFI1_ZEROCOMP
+#endif
+#if defined(RLECOMP)
+		| SFI1_RLECOMP
+#endif
+	,
+#ifdef NHSTDC
+	0x00000000UL, 0x00000000UL
+#else
+	0x00000000L, 0x00000000L
+#endif
+};
+
+NEARDATA struct savefile_info sfrestinfo, sfsaveinfo = {
+#ifdef NHSTDC
+		0x00000000UL
+#else
+		0x00000000L
+#endif
+#if defined(COMPRESS) || defined(ZLIB_COMP)
+		| SFI1_EXTERNALCOMP
+#endif
+#if defined(ZEROCOMP)
+		| SFI1_ZEROCOMP
+#endif
+#if defined(RLECOMP)
+		| SFI1_RLECOMP
+#endif
+	,
+#ifdef NHSTDC
+	0x00000000UL, 0x00000000UL
+#else
+	0x00000000L, 0x00000000L
+#endif
+};
+
 /* dummy routine used to force linkage */
 void
 decl_init()

src/files.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)files.c	3.5	2004/11/22	*/
+/*	SCCS Id: @(#)files.c	3.5	2005/01/04	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -32,6 +32,13 @@ const
 extern int errno;
 #endif
 
+#ifdef ZLIB_COMP	/* RLC 09 Mar 1999: Support internal ZLIB */
+#include "zlib.h"
+# ifndef COMPRESS_EXTENSION
+#define COMPRESS_EXTENSION ".gz"
+# endif
+#endif
+  
 #if defined(UNIX) && defined(QT_GRAPHICS)
 #include <sys/types.h>
 #include <dirent.h>
@@ -158,6 +165,8 @@ STATIC_DCL char *FDECL(set_bonesfile_name, (char *,d_level*));
 STATIC_DCL char *NDECL(set_bonestemp_name);
 #ifdef COMPRESS
 STATIC_DCL void FDECL(redirect, (const char *,const char *,FILE *,BOOLEAN_P));
+#endif
+#if defined(COMPRESS) || defined(ZLIB_COMP)
 STATIC_DCL void FDECL(docompress_file, (const char *,BOOLEAN_P));
 #endif
 STATIC_DCL char *FDECL(make_lockname, (const char *,char *));
@@ -770,7 +779,7 @@ char **bonesid;
 
 	*bonesid = set_bonesfile_name(bones, lev);
 	fq_bones = fqname(bones, BONESPREFIX, 0);
-	uncompress(fq_bones);	/* no effect if nonexistent */
+	nh_uncompress(fq_bones);	/* no effect if nonexistent */
 #ifdef MAC
 	fd = macopen(fq_bones, O_RDONLY | O_BINARY, BONE_TYPE);
 #else
@@ -794,7 +803,7 @@ d_level *lev;
 void
 compress_bonesfile()
 {
-	compress(fqname(bones, BONESPREFIX, 0));
+	nh_compress(fqname(bones, BONESPREFIX, 0));
 }
 
 /* ----------  END BONES FILE HANDLING ----------- */
@@ -945,6 +954,7 @@ restore_saved_game()
 	const char *fq_save;
 	int fd;
 
+	reset_restpref();
 	set_savefile_name();
 #ifdef MFLOPPY
 	if (!saveDiskPrompt(1))
@@ -952,10 +962,10 @@ restore_saved_game()
 #endif /* MFLOPPY */
 	fq_save = fqname(SAVEF, SAVEPREFIX, 0);
 
-	uncompress(fq_save);
+	nh_uncompress(fq_save);
 	if ((fd = open_savefile()) < 0) return fd;
 
-	if (!uptodate(fd, fq_save)) {
+	if (validate(fd, fq_save) != 0) {
 	    (void) close(fd),  fd = -1;
 	    (void) delete_savefile();
 	}
@@ -975,16 +985,16 @@ const char* filename;
 #  ifdef COMPRESS_EXTENSION
     SAVEF[strlen(SAVEF)-strlen(COMPRESS_EXTENSION)] = '\0';
 #  endif
-    uncompress(SAVEF);
+    nh_uncompress(SAVEF);
     if ((fd = open_savefile()) >= 0) {
-	if (uptodate(fd, filename)) {
+	if (validate(fd, filename)==0) {
 	    char tplname[PL_NSIZ];
 	    get_plname_from_file(fd, tplname);
 	    result = strdup(tplname);
 	}
 	(void) close(fd);
     }
-    compress(SAVEF);
+    nh_compress(SAVEF);
 
     return result;
 # if 0
@@ -1033,6 +1043,9 @@ get_saved_games()
 	(void)fname_encode("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_-.",
 				'%', fnamebuf, encodedfnamebuf, BUFSZ);
 	Sprintf(SAVEF, "%s*.NetHack-saved-game", encodedfnamebuf);
+#if defined(ZLIB_COMP)
+	Strcat(SAVEF, COMPRESS_EXTENSION);
+#endif
 	fq_save = fqname(SAVEF, SAVEPREFIX, 0);
 
 	n = 0;
@@ -1278,10 +1291,10 @@ boolean uncomp;
 
 /* compress file */
 void
-compress(filename)
+nh_compress(filename)
 const char *filename;
 {
-#ifndef COMPRESS
+#if !defined(COMPRESS) && !defined(ZLIB_COMP)
 #if (defined(macintosh) && (defined(__SC__) || defined(__MRC__))) || defined(__MWERKS__)
 # pragma unused(filename)
 #endif
@@ -1293,10 +1306,10 @@ const char *filename;
 
 /* uncompress file if it exists */
 void
-uncompress(filename)
+nh_uncompress(filename)
 const char *filename;
 {
-#ifndef COMPRESS
+#if !defined(COMPRESS) && !defined(ZLIB_COMP)
 #if (defined(macintosh) && (defined(__SC__) || defined(__MRC__))) || defined(__MWERKS__)
 # pragma unused(filename)
 #endif
@@ -1305,6 +1318,174 @@ const char *filename;
 #endif
 }
 
+#ifdef ZLIB_COMP /* RLC 09 Mar 1999: Support internal ZLIB */
+static int
+make_compressed_name(filename,cfn)
+const char *filename;
+char *cfn;
+{
+#ifndef SHORT_FILENAMES
+	/* Assume free-form filename */
+
+	strcpy(cfn, filename);
+	strcat(cfn, COMPRESS_EXTENSION);
+	return TRUE;
+#else
+	/* Accomodates 8.3 restriction, but otherwise assumes free-form filenames.
+	   This may need to be revised for some systems.  If a name cannot be
+	   generated, this function may return FALSE and the file will then remain
+	   uncompressed. */
+	unsigned len;
+
+	/* Assume DOS style filename */
+
+	strcpy(cfn, filename);
+	len = strlen(cfn);
+	if (len>4 && stricmp(cfn+len-4,".sav")==0) {
+		/* Save file; change .SAV extension to .SAZ */
+		/* EMX/GCC (for OS/2) seems to miscompile cfn[len-1] */
+
+		cfn[strlen(cfn)-1]='z';
+		return TRUE;
+	} else if (strnicmp(cfn,"bones",5)==0) {
+		/* Bones file; change BONES prefix to BONEZ */
+
+		cfn[4]='z';
+		return TRUE;
+	} else {
+		/* Don't know how to convert this filename */
+
+		return FALSE;
+	}
+#endif /* !MSDOS */
+}
+
+STATIC_OVL void
+docompress_file(filename, uncomp)
+const char *filename;
+boolean uncomp;
+{
+	gzFile *compressedfile;
+	FILE *uncompressedfile;
+	char cfn[256];
+	char buf[1024];
+	unsigned len, len2;
+
+	if (!make_compressed_name(filename, cfn)) {
+		/* Can't generate a name for the compressed file
+		   due to 8.3 restriction */
+		return;
+	}
+
+	if (!uncomp) {
+		/* Open the input and output files */
+		/* Note that gzopen takes "wb" as its mode, even on systems where
+		   fopen takes "r" and "w" */
+
+		uncompressedfile = fopen(filename, RDBMODE);
+		if (uncompressedfile == NULL) {
+			perror(filename);
+			return;
+		}
+		compressedfile = gzopen(cfn, "wb");
+		if (compressedfile == NULL) {
+			if (errno == 0) {
+				pline("zlib failed to allocate memory");
+			} else {
+				perror(filename);
+			}
+			fclose(uncompressedfile);
+			return;
+		}
+
+		/* Copy from the uncompressed to the compressed file */
+
+		while (1) {
+			len = fread(buf, 1, sizeof(buf), uncompressedfile);
+			if (ferror(uncompressedfile)) {
+				pline("Failure reading uncompressed file");
+				pline("Can't compress %s.", filename);
+				fclose(uncompressedfile);
+				gzclose(compressedfile);
+				(void)unlink(cfn);
+				return;
+			}
+			if (len == 0) break;	/* End of file */
+
+			len2 = gzwrite(compressedfile, buf, len);
+			if (len2 == 0) {
+				pline("Failure writing compressed file");
+				pline("Can't compress %s.", filename);
+				fclose(uncompressedfile);
+				gzclose(compressedfile);
+				(void)unlink(cfn);
+				return;
+			}
+		}
+
+		fclose(uncompressedfile);
+		gzclose(compressedfile);
+
+		/* Delete the file left behind */
+
+		(void)unlink(filename);
+
+	} else {	/* uncomp */
+
+		/* Open the input and output files */
+		/* Note that gzopen takes "rb" as its mode, even on systems where
+		   fopen takes "r" and "w" */
+
+		compressedfile = gzopen(cfn, "rb");
+		if (compressedfile == NULL) {
+			if (errno == 0) {
+				pline("zlib failed to allocate memory");
+			} else if (errno != ENOENT) {
+				perror(filename);
+			}
+			return;
+		}
+		uncompressedfile = fopen(filename, WRBMODE);
+		if (uncompressedfile == NULL) {
+			perror(filename);
+			gzclose(compressedfile);
+			return;
+		}
+
+		/* Copy from the compressed to the uncompressed file */
+
+		while (1) {
+			len = gzread(compressedfile, buf, sizeof(buf));
+			if (len == (unsigned)-1) {
+				pline("Failure reading compressed file");
+				pline("Can't uncompress %s.", filename);
+				fclose(uncompressedfile);
+				gzclose(compressedfile);
+				(void)unlink(filename);
+				return;
+			}
+			if (len == 0) break;	/* End of file */
+
+			fwrite(buf, 1, len, uncompressedfile);
+			if (ferror(uncompressedfile)) {
+				pline("Failure writing uncompressed file");
+				pline("Can't uncompress %s.", filename);
+				fclose(uncompressedfile);
+				gzclose(compressedfile);
+				(void)unlink(filename);
+				return;
+			}
+		}
+
+		fclose(uncompressedfile);
+		gzclose(compressedfile);
+
+		/* Delete the file left behind */
+		(void)unlink(cfn);
+	}
+}
+#endif /* RLC 09 Mar 1999: End ZLIB patch */
+
 /* ----------  END FILE COMPRESSION HANDLING ----------- */
 
 

src/options.c

@@ -165,6 +165,15 @@ static struct Bool_Opt
 	{"rawio", (boolean *)0, FALSE, SET_IN_FILE},
 #endif
 	{"rest_on_space", &flags.rest_on_space, FALSE, SET_IN_GAME},
+#ifdef RLECOMP
+	{"rlecomp", &iflags.rlecomp,
+# if defined(COMPRESS) || defined(ZLIB_COMP)
+		FALSE,
+# else
+		TRUE,
+# endif
+		DISP_IN_GAME},
+#endif
 	{"safe_pet", &flags.safe_dog, TRUE, SET_IN_GAME},
 #ifdef WIZARD
 	{"sanity_check", &iflags.sanity_check, FALSE, SET_IN_GAME},
@@ -206,6 +215,15 @@ static struct Bool_Opt
 #endif
 	{"verbose", &flags.verbose, TRUE, SET_IN_GAME},
 	{"wraptext", &iflags.wc2_wraptext, FALSE, SET_IN_GAME},
+#ifdef ZEROCOMP
+	{"zerocomp", &iflags.zerocomp,
+# if defined(COMPRESS) || defined(ZLIB_COMP)
+		FALSE,
+# else
+		TRUE,
+# endif
+		DISP_IN_GAME},
+#endif
 	{(char *)0, (boolean *)0, FALSE, 0}
 };
 
@@ -515,6 +533,23 @@ initoptions()
 		if (boolopt[i].addr)
 			*(boolopt[i].addr) = boolopt[i].initvalue;
 	}
+#if defined(COMPRESS) || defined(ZLIB_COMP)
+	set_savepref("externalcomp");
+	set_restpref("externalcomp");
+# ifdef RLECOMP
+	set_savepref("!rlecomp");
+	set_restpref("!rlecomp");
+# endif
+#else
+# ifdef ZEROCOMP
+	set_savepref("zerocomp");
+	set_restpref("zerocomp");
+# endif
+# ifdef RLECOMP
+	set_savepref("rlecomp");
+	set_restpref("rlecomp");
+# endif
+#endif
 #ifdef SYSFLAGS
 	Strcpy(sysflags.sysflagsid, "sysflags");
 	sysflags.sysflagsid[9] = (char)sizeof(struct sysflag);
@@ -2328,7 +2363,22 @@ goodfruit:
 # endif
 			}
 #endif /* TERMLIB || ASCIIGRAPH || MAC_GRAPHICS_ENV */
-
+#ifdef RLECOMP
+			if ((boolopt[i].addr) == &iflags.rlecomp) {
+				if (*boolopt[i].addr)
+					set_savepref("rlecomp");
+				else
+					set_savepref("!rlecomp");
+			}
+#endif
+#ifdef ZEROCOMP
+			if ((boolopt[i].addr) == &iflags.zerocomp) {
+				if (*boolopt[i].addr)
+					set_savepref("zerocomp");
+				else
+					set_savepref("externalcomp");
+			}
+#endif
 			/* only do processing below if setting with doset() */
 			if (initial) return;
 

src/restore.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)restore.c	3.5	2003/09/06	*/
+/*	SCCS Id: @(#)restore.c	3.5	2005/01/04	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -16,8 +16,14 @@ extern void FDECL(substitute_tiles, (d_level *));       /* from tile.c */
 #endif
 
 #ifdef ZEROCOMP
-static int NDECL(mgetc);
+STATIC_DCL void NDECL(zerocomp_minit);
+STATIC_DCL void FDECL(zerocomp_mread, (int,genericptr_t,unsigned int));
+STATIC_DCL int NDECL(zerocomp_mgetc);
 #endif
+
+STATIC_DCL void NDECL(def_minit);
+STATIC_DCL void FDECL(def_mread, (int,genericptr_t,unsigned int));
+
 STATIC_DCL void NDECL(find_lev_obj);
 STATIC_DCL void FDECL(restlevchn, (int));
 STATIC_DCL void FDECL(restdamage, (int,BOOLEAN_P));
@@ -34,6 +40,27 @@ STATIC_DCL void FDECL(reset_oattached_mids, (BOOLEAN_P));
 #ifndef GOLDOBJ
 STATIC_DCL struct obj *FDECL(gold_in, (struct obj *));
 #endif
+STATIC_DCL void FDECL(rest_levl, (int,BOOLEAN_P));
+
+static struct restore_procs {
+	const char *name;
+	int mread_flags;
+	void NDECL((*restore_minit));
+	void FDECL((*restore_mread), (int,genericptr_t,unsigned int));
+	void FDECL((*restore_bclose), (int));
+} restoreprocs = {
+#if !defined(ZEROCOMP) || (defined(COMPRESS) || defined(ZLIB_COMP))
+	"externalcomp", 0,
+	def_minit,
+	def_mread,
+	def_bclose,
+#else
+	"zerocomp", 0,
+	zerocomp_minit,
+	zerocomp_mread,
+	zerocomp_bclose,
+#endif
+};
 
 /*
  * Save a mapping of IDs from ghost levels to the current level.  This
@@ -547,7 +574,7 @@ xchar ltmp;
 			playwoRAMdisk();
 			/* Rewind save file and try again */
 			(void) lseek(fd, (off_t)0, 0);
-			(void) uptodate(fd, (char *)0);	/* skip version */
+			(void) validate(fd, (char *)0);	/* skip version etc */
 			return dorecover(fd);	/* 0 or 1 */
 		} else {
 # endif
@@ -624,12 +651,10 @@ register int fd;
 	if (strncmpi("X11", windowprocs.name, 3))
     	  putstr(WIN_MAP, 0, "Restoring:");
 #endif
+	restoreprocs.mread_flags = 1;	/* return despite error */
 	while(1) {
-#ifdef ZEROCOMP
-		if(mread(fd, (genericptr_t) &ltmp, sizeof ltmp) < 0)
-#else
-		if(read(fd, (genericptr_t) &ltmp, sizeof ltmp) != sizeof ltmp)
-#endif
+		mread(fd, (genericptr_t) &ltmp, sizeof ltmp);
+		if (restoreprocs.mread_flags == -1)
 			break;
 		getlev(fd, 0, ltmp, FALSE);
 #ifdef MICRO
@@ -646,18 +671,24 @@ register int fd;
 		rtmp = restlevelfile(fd, ltmp);
 		if (rtmp < 2) return(rtmp);  /* dorecover called recursively */
 	}
+	restoreprocs.mread_flags = 0;
 
 #ifdef BSD
 	(void) lseek(fd, 0L, 0);
 #else
 	(void) lseek(fd, (off_t)0, 0);
 #endif
-	(void) uptodate(fd, (char *)0);		/* skip version info */
+	(void) validate(fd, (char *)0);		/* skip version and savefile info */
 	get_plname_from_file(fd, plname);
 
 	getlev(fd, 0, (xchar)0, FALSE);
 	(void) close(fd);
 
+	/* Now set the restore settings to match the
+	 * settings used by the save file output routines
+	 */
+	reset_restpref();
+
 	if (!wizard && !discover)
 		(void) delete_savefile();
 #ifdef REINCARNATION
@@ -700,6 +731,41 @@ register int fd;
 	return(1);
 }
 
+STATIC_OVL void
+rest_levl(fd, rlecomp)
+int fd;
+boolean rlecomp;
+{
+#ifdef RLECOMP
+	short	i, j;
+	uchar	len;
+	struct rm r;
+
+	if (rlecomp) {
+# if defined(MAC)
+		/* Suppress warning about used before set */
+		(void) memset((genericptr_t) &r, 0, sizeof(r));
+# endif
+		i = 0; j = 0; len = 0;
+		while(i < ROWNO) {
+		    while(j < COLNO) {
+			if(len > 0) {
+			    levl[j][i] = r;
+			    len -= 1;
+			    j += 1;
+			} else {
+			    mread(fd, (genericptr_t)&len, sizeof(uchar));
+			    mread(fd, (genericptr_t)&r, sizeof(struct rm));
+			}
+		    }
+		    j = 0;
+		    i += 1;
+		}
+	} else
+#endif /* RLECOMP */
+	mread(fd, (genericptr_t) levl, sizeof(levl));
+}
+
 void
 trickery(reason)
 char *reason;
@@ -760,37 +826,7 @@ boolean ghostly;
 #endif
 	    trickery(trickbuf);
 	}
-
-#ifdef RLECOMP
-	{
-		short	i, j;
-		uchar	len;
-		struct rm r;
-		
-#if defined(MAC)
-		/* Suppress warning about used before set */
-		(void) memset((genericptr_t) &r, 0, sizeof(r));
-#endif
-		i = 0; j = 0; len = 0;
-		while(i < ROWNO) {
-		    while(j < COLNO) {
-			if(len > 0) {
-			    levl[j][i] = r;
-			    len -= 1;
-			    j += 1;
-			} else {
-			    mread(fd, (genericptr_t)&len, sizeof(uchar));
-			    mread(fd, (genericptr_t)&r, sizeof(struct rm));
-			}
-		    }
-		    j = 0;
-		    i += 1;
-		}
-	}
-#else
-	mread(fd, (genericptr_t) levl, sizeof(levl));
-#endif	/* RLECOMP */
-
+	rest_levl(fd, (boolean)((sfrestinfo.sfi1 & SFI1_RLECOMP) == SFI1_RLECOMP));
 	mread(fd, (genericptr_t)&omoves, sizeof(omoves));
 	mread(fd, (genericptr_t)&upstair, sizeof(stairway));
 	mread(fd, (genericptr_t)&dnstair, sizeof(stairway));
@@ -1051,6 +1087,145 @@ boolean ghostly;
 }
 
 
+void
+minit()
+{
+    (*restoreprocs.restore_minit)();
+    return;
+}
+
+void
+mread(fd, buf, len)
+register int fd;
+register genericptr_t buf;
+register unsigned int len;
+{
+    (*restoreprocs.restore_mread)(fd, buf, len);
+    return;
+}
+
+/* examine the version info and the savefile_info data
+   that immediately follows it.
+   Return 0 if it passed the checks.
+   Return 1 if it failed the version check.
+   Return 2 if it failed the savefile feature check.
+   Return -1 if it failed for some unknown reason.
+ */
+int
+validate(fd, name)
+int fd;
+const char *name;
+{
+    int rlen;
+    struct savefile_info sfi;
+    unsigned long compatible;
+    boolean verbose = name ? TRUE : FALSE, reslt = FALSE;
+
+    if (!(reslt = uptodate(fd, name))) return 1;
+
+    rlen = read(fd, (genericptr_t) &sfi, sizeof sfi);
+    minit();		/* ZEROCOMP */
+    if (rlen == 0) {
+	if (verbose) {
+	    pline("File \"%s\" is empty during save file feature check?", name);
+	    wait_synch();
+	}
+	return -1;
+    }
+
+    compatible = (sfi.sfi1 & sfcap.sfi1);
+
+    if ((sfi.sfi1 & SFI1_ZEROCOMP) == SFI1_ZEROCOMP) {
+	if ((compatible & SFI1_ZEROCOMP) != SFI1_ZEROCOMP) {
+	    if (verbose) {
+		pline("File \"%s\" has incompatible ZEROCOMP compression.", name);
+		wait_synch();
+	    }
+	    return 2;
+	} else if ((sfrestinfo.sfi1 & SFI1_ZEROCOMP) != SFI1_ZEROCOMP) {
+	    set_restpref("zerocomp");
+	}
+    }
+
+    if ((sfi.sfi1 & SFI1_EXTERNALCOMP) == SFI1_EXTERNALCOMP) {
+	if ((compatible & SFI1_EXTERNALCOMP) != SFI1_EXTERNALCOMP) {
+	    if (verbose) {
+		pline("File \"%s\" lacks required internal compression.", name);
+		wait_synch();
+	    }
+	    return 2;
+	} else if ((sfrestinfo.sfi1 & SFI1_EXTERNALCOMP) != SFI1_EXTERNALCOMP) {
+	    set_restpref("externalcomp");
+	}
+    }
+
+    /* RLECOMP check must be last, after ZEROCOMP or INTERNALCOMP adjustments */
+    if ((sfi.sfi1 & SFI1_RLECOMP) == SFI1_RLECOMP) {
+	if ((compatible & SFI1_RLECOMP) != SFI1_RLECOMP) {
+	    if (verbose) {
+		pline("File \"%s\" has incompatible run-length compression.", name);
+		wait_synch();
+	    }
+	    return 2;
+	} else if ((sfrestinfo.sfi1 & SFI1_RLECOMP) != SFI1_RLECOMP) {
+	    set_restpref("rlecomp");
+        }
+    }
+    /* savefile does not have RLECOMP level location compression, so adjust */
+    else set_restpref("!rlecomp");
+
+    return 0;
+}
+
+void
+reset_restpref()
+{
+#ifdef ZEROCOMP
+	if (iflags.zerocomp)
+		set_restpref("zerocomp");
+	else 
+#endif
+		set_restpref("externalcomp");
+#ifdef RLECOMP
+	if (iflags.rlecomp)
+		set_restpref("rlecomp");
+	else
+#endif
+		set_restpref("!rlecomp");
+}
+
+void
+set_restpref(suitename)
+const char *suitename;
+{
+	if (!strcmpi(suitename, "externalcomp")) {
+		restoreprocs.name = "externalcomp";
+    		restoreprocs.restore_mread = def_mread;
+    		restoreprocs.restore_minit = def_minit;
+		sfrestinfo.sfi1 |= SFI1_EXTERNALCOMP;
+		sfrestinfo.sfi1 &= ~SFI1_ZEROCOMP;
+		def_minit();
+	}
+	if (!strcmpi(suitename, "!rlecomp")) {
+		sfrestinfo.sfi1 &= ~SFI1_RLECOMP;
+	}
+#ifdef ZEROCOMP
+	if (!strcmpi(suitename, "zerocomp")) {
+		restoreprocs.name = "zerocomp";
+    		restoreprocs.restore_mread = zerocomp_mread;
+    		restoreprocs.restore_minit = zerocomp_minit;
+		sfrestinfo.sfi1 |= SFI1_ZEROCOMP;
+		sfrestinfo.sfi1 &= ~SFI1_EXTERNALCOMP;
+		zerocomp_minit();
+	}
+#endif
+#ifdef RLECOMP
+	if (!strcmpi(suitename, "rlecomp")) {
+		sfrestinfo.sfi1 |= SFI1_RLECOMP;
+	}
+#endif
+}
+
 #ifdef ZEROCOMP
 #define RLESC '\0'	/* Leading character for run of RLESC's */
 
@@ -1063,8 +1238,8 @@ static NEARDATA unsigned short inbufsz = 0;
 static NEARDATA short inrunlength = -1;
 static NEARDATA int mreadfd;
 
-static int
-mgetc()
+STATIC_OVL int
+zerocomp_mgetc()
 {
     if (inbufp >= inbufsz) {
 	inbufsz = read(mreadfd, (genericptr_t)inbuf, sizeof inbuf);
@@ -1079,16 +1254,16 @@ mgetc()
     return inbuf[inbufp++];
 }
 
-void
-minit()
+STATIC_OVL void
+zerocomp_minit()
 {
     inbufsz = 0;
     inbufp = 0;
     inrunlength = -1;
 }
 
-int
-mread(fd, buf, len)
+STATIC_OVL void
+zerocomp_mread(fd, buf, len)
 int fd;
 genericptr_t buf;
 register unsigned len;
@@ -1101,27 +1276,28 @@ register unsigned len;
 	    inrunlength--;
 	    *(*((char **)&buf))++ = '\0';
 	} else {
-	    register short ch = mgetc();
-	    if (ch < 0) return -1; /*readlen;*/
+	    register short ch = zerocomp_mgetc();
+	    if (ch < 0) {
+		restoreprocs.mread_flags = -1;
+		return;
+	    }
 	    if ((*(*(char **)&buf)++ = (char)ch) == RLESC) {
-		inrunlength = mgetc();
+		inrunlength = zerocomp_mgetc();
 	    }
 	}
 	/*readlen++;*/
     }
-    return 0; /*readlen;*/
 }
+#endif /* ZEROCOMP */
 
-#else /* ZEROCOMP */
-
-void
-minit()
+STATIC_OVL void
+def_minit()
 {
     return;
 }
 
-void
-mread(fd, buf, len)
+STATIC_OVL void
+def_mread(fd, buf, len)
 register int fd;
 register genericptr_t buf;
 register unsigned int len;
@@ -1135,6 +1311,10 @@ register unsigned int len;
 	rlen = read(fd, buf, (unsigned) len);
 	if((unsigned)rlen != len){
 #endif
+	    if (restoreprocs.mread_flags == 1) { /* means "return anyway" */
+		restoreprocs.mread_flags = -1;
+		return;
+	    } else {
 		pline("Read %d instead of %u bytes.", rlen, len);
 		if(restoring) {
 			(void) close(fd);
@@ -1143,8 +1323,9 @@ register unsigned int len;
 		}
 		panic("Error reading level file.");
 	    }
+	}
 }
-#endif /* ZEROCOMP */
+
 #ifndef GOLDOBJ
 /*
  * Takes all of the gold objects out of the invent or

src/save.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)save.c	3.5	2003/11/14	*/
+/*	SCCS Id: @(#)save.c	3.5	2005/01/04	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -22,9 +22,6 @@ static int count_only;
 int dotcnt, dotrow;	/* also used in restore */
 #endif
 
-#ifdef ZEROCOMP
-STATIC_DCL void FDECL(bputc, (int));
-#endif
 STATIC_DCL void FDECL(savelevchn, (int,int));
 STATIC_DCL void FDECL(savedamage, (int,int));
 STATIC_DCL void FDECL(saveobjchn, (int,struct obj *,int));
@@ -37,6 +34,44 @@ STATIC_DCL void FDECL(savelev0, (int,XCHAR_P,int));
 STATIC_DCL boolean NDECL(swapout_oldest);
 STATIC_DCL void FDECL(copyfile, (char *,char *));
 #endif /* MFLOPPY */
+STATIC_DCL void FDECL(savelevl, (int fd, BOOLEAN_P));
+STATIC_DCL void FDECL(def_bufon, (int));
+STATIC_DCL void FDECL(def_bufoff, (int));
+STATIC_DCL void FDECL(def_bflush, (int));
+STATIC_DCL void FDECL(def_bwrite, (int,genericptr_t,unsigned int));
+#ifdef ZEROCOMP
+STATIC_DCL void FDECL(zerocomp_bufon, (int));
+STATIC_DCL void FDECL(zerocomp_bufoff, (int));
+STATIC_DCL void FDECL(zerocomp_bflush, (int));
+STATIC_DCL void FDECL(zerocomp_bwrite, (int,genericptr_t,unsigned int));
+STATIC_DCL void FDECL(zerocomp_bputc, (int));
+#endif
+
+static struct save_procs {
+	const char *name;
+	void FDECL((*save_bufon), (int));
+	void FDECL((*save_bufoff), (int));
+	void FDECL((*save_bflush), (int));
+	void FDECL((*save_bwrite), (int,genericptr_t,unsigned int));
+	void FDECL((*save_bclose), (int));
+} saveprocs = {
+#if !defined(ZEROCOMP) || (defined(COMPRESS) || defined(ZLIB_COMP))
+	"externalcomp",
+	def_bufon,
+	def_bufoff,
+	def_bflush,
+	def_bwrite,
+	def_bclose,
+#else
+	"zerocomp",
+	zerocomp_bufon,
+	zerocomp_bufoff,
+	zerocomp_bflush,
+	zerocomp_bwrite,
+	zerocomp_bclose,
+#endif
+};
+
 #ifdef GCC_WARN
 static long nulls[10];
 #else
@@ -140,14 +175,14 @@ dosave0()
 #endif
 
 	HUP if (iflags.window_inited) {
-	    uncompress(fq_save);
+	    nh_uncompress(fq_save);
 	    fd = open_savefile();
 	    if (fd > 0) {
 		(void) close(fd);
 		clear_nhwindow(WIN_MESSAGE);
 		There("seems to be an old save file.");
 		if (yn("Overwrite the old file?") == 'n') {
-		    compress(fq_save);
+		    nh_compress(fq_save);
 		    return 0;
 		}
 	    }
@@ -209,6 +244,7 @@ dosave0()
 #endif /* MFLOPPY */
 
 	store_version(fd);
+	store_savefileinfo(fd);
 	store_plname_in_file(fd);
 	ustuck_id = (u.ustuck ? u.ustuck->m_id : 0);
 #ifdef STEED
@@ -269,7 +305,7 @@ dosave0()
 	/* get rid of current level --jgm */
 	delete_levelfile(ledger_no(&u.uz));
 	delete_levelfile(0);
-	compress(fq_save);
+	nh_compress(fq_save);
 	return(1);
 }
 
@@ -405,6 +441,7 @@ savestateinlock()
 		    (void) write(fd, (genericptr_t) &currlev, sizeof(currlev));
 		    save_savefile_name(fd);
 		    store_version(fd);
+		    store_savefileinfo(fd);
 		    store_plname_in_file(fd);
 
 		    ustuck_id = (u.ustuck ? u.ustuck->m_id : 0);
@@ -489,54 +526,7 @@ int mode;
 #else
 	bwrite(fd,(genericptr_t) &lev,sizeof(lev));
 #endif
-#ifdef RLECOMP
-	{
-	    /* perform run-length encoding of rm structs */
-	    struct rm *prm, *rgrm;
-	    int x, y;
-	    uchar match;
-
-	    rgrm = &levl[0][0];		/* start matching at first rm */
-	    match = 0;
-
-	    for (y = 0; y < ROWNO; y++) {
-		for (x = 0; x < COLNO; x++) {
-		    prm = &levl[x][y];
-		    if (prm->glyph == rgrm->glyph
-			&& prm->typ == rgrm->typ
-			&& prm->seenv == rgrm->seenv
-			&& prm->horizontal == rgrm->horizontal
-			&& prm->flags == rgrm->flags
-			&& prm->lit == rgrm->lit
-			&& prm->waslit == rgrm->waslit
-			&& prm->roomno == rgrm->roomno
-			&& prm->edge == rgrm->edge) {
-			match++;
-			if (match > 254) {
-			    match = 254;	/* undo this match */
-			    goto writeout;
-			}
-		    } else {
-			/* the run has been broken,
-			 * write out run-length encoding */
-		    writeout:
-			bwrite(fd, (genericptr_t)&match, sizeof(uchar));
-			bwrite(fd, (genericptr_t)rgrm, sizeof(struct rm));
-			/* start encoding again. we have at least 1 rm
-			 * in the next run, viz. this one. */
-			match = 1;
-			rgrm = prm;
-		    }
-		}
-	    }
-	    if (match > 0) {
-		bwrite(fd, (genericptr_t)&match, sizeof(uchar));
-		bwrite(fd, (genericptr_t)rgrm, sizeof(struct rm));
-	    }
-	}
-#else
-	bwrite(fd,(genericptr_t) levl,sizeof(levl));
-#endif /* RLECOMP */
+	savelevl(fd, (boolean)((sfsaveinfo.sfi1 & SFI1_RLECOMP) == SFI1_RLECOMP));
 
 	bwrite(fd,(genericptr_t) &monstermoves,sizeof(monstermoves));
 	bwrite(fd,(genericptr_t) &upstair,sizeof(stairway));
@@ -575,6 +565,202 @@ int mode;
 	if (mode != FREE_SAVE) bflush(fd);
 }
 
+STATIC_OVL void
+savelevl(fd, rlecomp)
+int fd;
+boolean rlecomp;
+{
+#ifdef RLECOMP
+	struct rm *prm, *rgrm;
+	int x, y;
+	uchar match;
+
+	if (rlecomp) {
+	    /* perform run-length encoding of rm structs */
+
+	    rgrm = &levl[0][0];		/* start matching at first rm */
+	    match = 0;
+
+	    for (y = 0; y < ROWNO; y++) {
+		for (x = 0; x < COLNO; x++) {
+		    prm = &levl[x][y];
+		    if (prm->glyph == rgrm->glyph
+			&& prm->typ == rgrm->typ
+			&& prm->seenv == rgrm->seenv
+			&& prm->horizontal == rgrm->horizontal
+			&& prm->flags == rgrm->flags
+			&& prm->lit == rgrm->lit
+			&& prm->waslit == rgrm->waslit
+			&& prm->roomno == rgrm->roomno
+			&& prm->edge == rgrm->edge) {
+			match++;
+			if (match > 254) {
+			    match = 254;	/* undo this match */
+			    goto writeout;
+			}
+		    } else {
+			/* the run has been broken,
+			 * write out run-length encoding */
+		    writeout:
+			bwrite(fd, (genericptr_t)&match, sizeof(uchar));
+			bwrite(fd, (genericptr_t)rgrm, sizeof(struct rm));
+			/* start encoding again. we have at least 1 rm
+			 * in the next run, viz. this one. */
+			match = 1;
+			rgrm = prm;
+		    }
+		}
+	    }
+	    if (match > 0) {
+		bwrite(fd, (genericptr_t)&match, sizeof(uchar));
+		bwrite(fd, (genericptr_t)rgrm, sizeof(struct rm));
+	    }
+	} else
+#endif /* RLECOMP */
+	bwrite(fd,(genericptr_t) levl,sizeof(levl));
+}
+
+/*ARGSUSED*/
+void
+bufon(fd)
+int fd;
+{
+    (*saveprocs.save_bufon)(fd);
+    return;
+}
+
+/*ARGSUSED*/
+void
+bufoff(fd)
+int fd;
+{
+    (*saveprocs.save_bufoff)(fd);
+    return;
+}
+
+void
+bflush(fd)  /* flush run and buffer */
+register int fd;
+{
+    (*saveprocs.save_bflush)(fd);
+    return;
+}
+
+void
+bwrite(fd, loc, num)
+int fd;
+genericptr_t loc;
+register unsigned num;
+{
+    (*saveprocs.save_bwrite)(fd, loc, num);
+    return;
+}
+
+void
+bclose(fd)
+int fd;
+{
+    (*saveprocs.save_bclose)(fd);
+    return;
+}
+
+static int bw_fd = -1;
+static FILE *bw_FILE = 0;
+static boolean buffering = FALSE;
+
+STATIC_OVL void
+def_bufon(fd)
+    int fd;
+{
+#ifdef UNIX
+    if(bw_fd != fd) {
+	if(bw_fd >= 0)
+	    panic("double buffering unexpected");
+	bw_fd = fd;
+	if((bw_FILE = fdopen(fd, "w")) == 0)
+	    panic("buffering of file %d failed", fd);
+    }
+#endif
+    buffering = TRUE;
+}
+
+STATIC_OVL void
+def_bufoff(fd)
+int fd;
+{
+    def_bflush(fd);
+    buffering = FALSE;
+}
+
+STATIC_OVL void
+def_bflush(fd)
+    int fd;
+{
+#ifdef UNIX
+    if(fd == bw_fd) {
+	if(fflush(bw_FILE) == EOF)
+	    panic("flush of savefile failed!");
+    }
+#endif
+    return;
+}
+
+STATIC_OVL void
+def_bwrite(fd,loc,num)
+register int fd;
+register genericptr_t loc;
+register unsigned num;
+{
+	boolean failed;
+
+#ifdef MFLOPPY
+	bytes_counted += num;
+	if (count_only) return;
+#endif
+
+#ifdef UNIX
+	if (buffering) {
+	    if(fd != bw_fd)
+		panic("unbuffered write to fd %d (!= %d)", fd, bw_fd);
+
+	    failed = (fwrite(loc, (int)num, 1, bw_FILE) != 1);
+	} else
+#endif /* UNIX */
+	{
+/* lint wants the 3rd arg of write to be an int; lint -p an unsigned */
+#if defined(BSD) || defined(ULTRIX) || defined(WIN32)
+	    failed = (write(fd, loc, (int)num) != (int)num);
+#else /* e.g. SYSV, __TURBOC__ */
+	    failed = (write(fd, loc, num) != num);
+#endif
+	}
+
+	if (failed) {
+#if defined(UNIX) || defined(VMS) || defined(__EMX__)
+	    if (program_state.done_hup)
+		terminate(EXIT_FAILURE);
+	    else
+#endif
+		panic("cannot write %u bytes to file #%d", num, fd);
+	}
+}
+
+void
+def_bclose(fd)
+    int fd;
+{
+    bufoff(fd);
+#ifdef UNIX
+    if (fd == bw_fd) {
+	(void) fclose(bw_FILE);
+	bw_fd = -1;
+	bw_FILE = 0;
+    } else
+#endif
+	(void) close(fd);
+    return;
+}
+
 #ifdef ZEROCOMP
 /* The runs of zero-run compression are flushed after the game state or a
  * level is written out.  This adds a couple bytes to a save file, where
@@ -585,7 +771,7 @@ int mode;
  */
 
 #define RLESC '\0'    /* Leading character for run of LRESC's */
-#define flushoutrun(ln) (bputc(RLESC), bputc(ln), ln = -1)
+#define flushoutrun(ln) (zerocomp_bputc(RLESC), zerocomp_bputc(ln), ln = -1)
 
 #ifndef ZEROCOMP_BUFSIZ
 # define ZEROCOMP_BUFSIZ BUFSZ
@@ -602,7 +788,7 @@ static NEARDATA boolean compressing = FALSE;
 }*/
 
 STATIC_OVL void
-bputc(c)
+zerocomp_bputc(c)
 int c;
 {
 #ifdef MFLOPPY
@@ -619,7 +805,7 @@ int c;
 
 /*ARGSUSED*/
 void
-bufon(fd)
+STATIC_OVL zerocomp_bufon(fd)
 int fd;
 {
     compressing = TRUE;
@@ -627,8 +813,8 @@ int fd;
 }
 
 /*ARGSUSED*/
-void
-bufoff(fd)
+STATIC_OVL void
+zerocomp_bufoff(fd)
 int fd;
 {
     if (outbufp) {
@@ -640,8 +826,8 @@ int fd;
     return;
 }
 
-void
-bflush(fd)  /* flush run and buffer */
+STATIC_OVL void
+zerocomp_bflush(fd)  /* flush run and buffer */
 register int fd;
 {
     bwritefd = fd;
@@ -659,14 +845,14 @@ register int fd;
 		terminate(EXIT_FAILURE);
 	    else
 #endif
-		bclose(fd);	/* panic (outbufp != 0) */
+		zerocomp_bclose(fd);	/* panic (outbufp != 0) */
 	}
 	outbufp = 0;
     }
 }
 
-void
-bwrite(fd, loc, num)
+STATIC_OVL void
+zerocomp_bwrite(fd, loc, num)
 int fd;
 genericptr_t loc;
 register unsigned num;
@@ -697,116 +883,17 @@ register unsigned num;
 		if (outrunlength >= 0) {	/* flush run */
 		    flushoutrun(outrunlength);
 		}
-		bputc(*bp);
+		zerocomp_bputc(*bp);
 	    }
 	}
     }
 }
 
 void
-bclose(fd)
+zerocomp_bclose(fd)
 int fd;
 {
-    bufoff(fd);
-    (void) close(fd);
-    return;
-}
-
-#else /* ZEROCOMP */
-
-static int bw_fd = -1;
-static FILE *bw_FILE = 0;
-static boolean buffering = FALSE;
-
-void
-bufon(fd)
-    int fd;
-{
-#ifdef UNIX
-    if(bw_fd != fd) {
-	if(bw_fd >= 0)
-	    panic("double buffering unexpected");
-	bw_fd = fd;
-	if((bw_FILE = fdopen(fd, "w")) == 0)
-	    panic("buffering of file %d failed", fd);
-    }
-#endif
-    buffering = TRUE;
-}
-
-void
-bufoff(fd)
-int fd;
-{
-    bflush(fd);
-    buffering = FALSE;
-}
-
-void
-bflush(fd)
-    int fd;
-{
-#ifdef UNIX
-    if(fd == bw_fd) {
-	if(fflush(bw_FILE) == EOF)
-	    panic("flush of savefile failed!");
-    }
-#endif
-    return;
-}
-
-void
-bwrite(fd,loc,num)
-register int fd;
-register genericptr_t loc;
-register unsigned num;
-{
-	boolean failed;
-
-#ifdef MFLOPPY
-	bytes_counted += num;
-	if (count_only) return;
-#endif
-
-#ifdef UNIX
-	if (buffering) {
-	    if(fd != bw_fd)
-		panic("unbuffered write to fd %d (!= %d)", fd, bw_fd);
-
-	    failed = (fwrite(loc, (int)num, 1, bw_FILE) != 1);
-	} else
-#endif /* UNIX */
-	{
-/* lint wants the 3rd arg of write to be an int; lint -p an unsigned */
-#if defined(BSD) || defined(ULTRIX)
-	    failed = (write(fd, loc, (int)num) != (int)num);
-#else /* e.g. SYSV, __TURBOC__ */
-	    failed = (write(fd, loc, num) != num);
-#endif
-	}
-
-	if (failed) {
-#if defined(UNIX) || defined(VMS) || defined(__EMX__)
-	    if (program_state.done_hup)
-		terminate(EXIT_FAILURE);
-	    else
-#endif
-		panic("cannot write %u bytes to file #%d", num, fd);
-	}
-}
-
-void
-bclose(fd)
-    int fd;
-{
-    bufoff(fd);
-#ifdef UNIX
-    if (fd == bw_fd) {
-	(void) fclose(bw_FILE);
-	bw_fd = -1;
-	bw_FILE = 0;
-    } else
-#endif
+    zerocomp_bufoff(fd);
     (void) close(fd);
     return;
 }
@@ -1049,6 +1136,65 @@ register int fd, mode;
 #endif
 }
 
+void
+store_savefileinfo(fd)
+int fd;
+{
+	/* sfcap (decl.c) describes the savefile feature capabilities
+	 * that are supported by this port/platform build.
+	 * 
+	 * sfsaveinfo (decl.c) describes the savefile info that actually
+	 * gets written into the savefile, and is used to determine the
+	 * save file being written.
+
+	 * sfrestinfo (decl.c) describes the savefile info that is
+	 * being used to read the information from an existing savefile.
+	 *
+	 */
+
+	bufoff(fd);
+	/* bwrite() before bufon() uses plain write() */
+	bwrite(fd,(genericptr_t)&sfsaveinfo, (unsigned)(sizeof sfsaveinfo));
+	bufon(fd);
+	return;
+}
+
+void
+set_savepref(suitename)
+const char *suitename;
+{
+	if (!strcmpi(suitename, "externalcomp")) {
+		saveprocs.name = "externalcomp";
+    		saveprocs.save_bufon = def_bufon;
+    		saveprocs.save_bufoff = def_bufoff;
+    		saveprocs.save_bflush = def_bflush;
+    		saveprocs.save_bwrite = def_bwrite;
+    		saveprocs.save_bclose = def_bclose;
+		sfsaveinfo.sfi1 |= SFI1_EXTERNALCOMP;
+		sfsaveinfo.sfi1 &= ~SFI1_ZEROCOMP;
+	}
+	if (!strcmpi(suitename, "!rlecomp")) {
+		sfsaveinfo.sfi1 &= ~SFI1_RLECOMP;
+	}
+#ifdef ZEROCOMP
+	if (!strcmpi(suitename, "zerocomp")) {
+		saveprocs.name = "zerocomp";
+    		saveprocs.save_bufon = zerocomp_bufon;
+    		saveprocs.save_bufoff = zerocomp_bufoff;
+    		saveprocs.save_bflush = zerocomp_bflush;
+    		saveprocs.save_bwrite = zerocomp_bwrite;
+    		saveprocs.save_bclose = zerocomp_bclose;
+		sfsaveinfo.sfi1 |= SFI1_ZEROCOMP;
+		sfsaveinfo.sfi1 &= ~SFI1_EXTERNALCOMP;
+	}
+#endif
+#ifdef RLECOMP
+	if (!strcmpi(suitename, "rlecomp")) {
+		sfsaveinfo.sfi1 |= SFI1_RLECOMP;
+	}
+#endif
+}
+	
 /* also called by prscore(); this probably belongs in dungeon.c... */
 void
 free_dungeons()

sys/be/bemain.c

@@ -106,7 +106,7 @@ int MAIN(int argc, char **argv)
 			if(yn("Do you want to keep the save file?") == 'n')
 			    (void) delete_savefile();
 			else {
-			    compress(fqname(SAVEF, SAVEPREFIX, 0));
+			    nh_compress(fqname(SAVEF, SAVEPREFIX, 0));
 			}
 		}
 

sys/mac/macmain.c

@@ -117,7 +117,7 @@ main (void)
 				if(yn("Do you want to keep the save file?") == 'n')
 					(void) delete_savefile();
 				else {
-					compress(fqname(SAVEF, SAVEPREFIX, 0));
+					nh_compress(fqname(SAVEF, SAVEPREFIX, 0));
 				}
 			}
 		}

sys/share/pcmain.c

@@ -423,9 +423,12 @@ char *argv[];
 		update_inventory();
 
 		if (discover || wizard) {
-			if(yn("Do you want to keep the save file?") == 'n'){
+			if(yn("Do you want to keep the save file?") == 'n')
 				(void) delete_savefile();
+			else {
+			    nh_compress(fqname(SAVEF, SAVEPREFIX, 0));
 			}
+
 		}
 
 		context.move = 0;

sys/unix/Makefile.src

@@ -282,6 +282,9 @@ WINLIB = $(WINTTYLIB)
 # IRIX 4.0.x needs -lsun if NIS (YP) is being used for passwd file lookup
 # LIBS = -lsun
 #
+# If ZLIB_COMP is defined in config.h this is necessary to link with zlib.
+# LIBS = -lz
+#
 LIBS =
 
 # make NetHack

sys/unix/unixmain.c

@@ -287,7 +287,7 @@ char *argv[];
 			    (void) delete_savefile();
 			else {
 			    (void) chmod(fq_save,FCMASK); /* back to readable */
-			    compress(fq_save);
+			    nh_compress(fq_save);
 			}
 		}
 		context.move = 0;

sys/winnt/Makefile.msc

@@ -1,5 +1,5 @@
 #       SCCS Id: @(#)Makefile.msc       3.5     $Date$
-#       Copyright (c) NetHack PC Development Team 1993-2003
+#       Copyright (c) NetHack PC Development Team 1993-2005
 #
 #       NetHack 3.5.x Makefile for MS Visual C++ V6.x and above and MS NMAKE
 #  
@@ -127,6 +127,15 @@ RANDOM	= $(OBJ)\random.o
 
 PRECOMPHEAD = N			# set to Y if you want to use precomp. headers
 
+#
+# If you defined ZLIB_COMP in include/config.h and you need
+# to link with the zlib.lib library, uncomment the line below.
+# If necessary, prefix explicit path information to the file name
+# otherwise it assumes the NetHack src directory.
+#
+
+#ZLIB = zlib.lib
+
 #===============================================
 #======= End of Modification Section ===========
 #===============================================
@@ -578,7 +587,7 @@ $(NHRES): $(NTSYS)\console.rc $(NTSYS)\NetHack.ico
 $(GAMEFILE) : $(ALLOBJ) $(NHRES) $(O)gamedir.tag $(WINDLLS)
 	@if not exist $(GAMEDIR)\*.* mkdir $(GAMEDIR)
 	@echo Linking....
-	$(link) $(LFLAGS) user32.lib winmm.lib -out:$@ @<<$(GAME).lnk
+	$(link) $(LFLAGS) $(ZLIB) user32.lib winmm.lib -out:$@ @<<$(GAME).lnk
 		$(ALLOBJ:^	=^
 		) $(NHRES)
 <<

util/makedefs.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)makedefs.c	3.5	2002/08/14	*/
+/*	SCCS Id: @(#)makedefs.c	3.5	2005/01/04	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* Copyright (c) M. Stephenson, 1990, 1991.			  */
 /* Copyright (c) Dean Luick, 1990.				  */
@@ -411,11 +411,24 @@ do_rumors()
 
 /*
  * Use this to explicitly mask out features during version checks.
+ *
+ * ZEROCOMP, RLECOMP, and ZLIB_COMP describe compression features
+ * that the port/plaform which wrote the savefile was capable of
+ * dealing with. Don't reject a savefile just because the port
+ * reading the savefile doesn't match on all/some of them.
+ * The actual compression features used to produce the savefile are
+ * recorded in the savefile_info structure immediately following the
+ * version_info, and that is what needs to be checked against the
+ * feature set of the port that is reading the savefile back in.
+ * That check is done in src/restore.c now.
+ * 
  */
 #define IGNORED_FEATURES	( 0L \
 				| (1L << 12)	/* GOLDOBJ */ \
 				| (1L << 20)	/* EXP_ON_BOTL */ \
 				| (1L << 21)	/* SCORE_ON_BOTL */ \
+				| (1L << 27)	/* ZEROCOMP */ \
+				| (1L << 28)	/* RLECOMP */ \
 				)
 
 static void
@@ -478,7 +491,9 @@ make_version()
 #ifdef SCORE_ON_BOTL
 			| (1L << 21)
 #endif
-		/* data format [COMPRESS excluded] (27..31) */
+		/* data format (27..31)
+		 * External compression methods such as COMPRESS and ZLIB_COMP
+		 * do not affect the contents and are thus excluded from here */
 #ifdef ZEROCOMP
 			| (1L << 27)
 #endif
@@ -653,6 +668,9 @@ static const char *build_opts[] = {
 #ifdef COMPRESS
 		"data file compression",
 #endif
+#ifdef ZLIB_COMP
+		"ZLIB data file compression",
+#endif
 #ifdef DLB
 		"data librarian",
 #endif
@@ -783,6 +801,9 @@ static const char *build_opts[] = {
 #endif
 #ifdef ZEROCOMP
 		"zero-compressed save files",
+#endif
+#ifdef RLECOMP
+		"run-length compression of levl array in save files",
 #endif
 		save_bones_compat_buf,
 		"basic NetHack features"