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xdelta3-main.h@ 1088

Last change on this file since 1088 was 185, checked in by geyser, 17 years ago

File size: 87.3 KB

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[185]	1	/* xdelta 3 - delta compression tools and library
	2	* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007,
	3	* Joshua P. MacDonald
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19
	20	/* This is all the extra stuff you need for convenience to users in a command line
	21	* application. It contains these major components:
	22	*
	23	* 1. VCDIFF tools
	24	* 2. external compression support (this is POSIX-specific).
	25	* 3. a general read/write loop that handles all of the Xdelta decode/encode/VCDIFF-print
	26	* functions
	27	* 4. command-line interpreter
	28	* 5. an Xdelta application header which stores default filename, external compression settings
	29	* 6. output/error printing
	30	* 7. basic file support and OS interface
	31	*/
	32
	33	/* TODO list:
	34	* 1. do exact gzip-like filename, stdout handling. make a .vcdiff extension, refuse
	35	* to encode to stdout without -cf, etc.
	36	* 2. Allow the user to add a comment string to the app header without disturbing the default
	37	* behavior.
	38	* 3. "Source file must be seekable" is not actually true for encoding, given current
	39	* behavior. Allow non-seekable sources? It would in theory let you use a fifo for
	40	* the source.
	41	*/
	42
	43	/* On error handling and printing:
	44	*
	45	* The xdelta library sets stream->msg to indicate what condition caused an internal
	46	* failure, but many failures originate here and are printed here. The return convention
	47	* is 0 for success, as throughout Xdelta code, but special attention is required here for
	48	* the operating system calls with different error handling. See the main_file_* routines.
	49	* All errors in this file have a message printed at the time of occurance. Since some of
	50	* these calls occur within calls to the library, the error may end up being printed again
	51	* with a more general error message.
	52	*/
	53
	54	/******************************************************************************************/
	55
	56	#ifndef XD3_POSIX
	57	#define XD3_POSIX 0
	58	#endif
	59	#ifndef XD3_STDIO
	60	#define XD3_STDIO 0
	61	#endif
	62	#ifndef XD3_WIN32
	63	#define XD3_WIN32 0
	64	#endif
	65
	66	/* Combines xd3_strerror() and strerror() */
	67	const char* xd3_mainerror(int err_num);
	68
	69	/* XPRINTX (used by main) prefixes an "xdelta3: " to the output. */
	70	#define XPR fprintf
	71	#define NT stderr, "xdelta3: "
	72
	73	/* If none are set, default to posix. */
	74	#if (XD3_POSIX + XD3_STDIO + XD3_WIN32) == 0
	75	#undef XD3_POSIX
	76	#define XD3_POSIX 1
	77	#endif
	78
	79	/* Handle externally-compressed inputs. */
	80	#ifndef EXTERNAL_COMPRESSION
	81	#define EXTERNAL_COMPRESSION 1
	82	#endif
	83
	84	#define PRINTHDR_SPECIAL -4378291
	85
	86	/* The number of soft-config variables. */
	87	#define XD3_SOFTCFG_VARCNT 7
	88
	89	/* this is used as in XPR(NT XD3_LIB_ERRMSG (stream, ret)) to print an error message
	90	* from the library. */
	91	#define XD3_LIB_ERRMSG(stream, ret) "%s: %s\n", xd3_errstring (stream), xd3_mainerror (ret)
	92
	93	#include <stdio.h> /* fprintf */
	94
	95	#if XD3_POSIX
	96	#include <unistd.h> /* close, read, write... */
	97	#include <sys/types.h>
	98	#include <fcntl.h>
	99	#endif
	100
	101	#ifndef _WIN32
	102	#include <unistd.h> /* lots */
	103	#include <sys/time.h> /* gettimeofday() */
	104	#include <sys/stat.h> /* stat() and fstat() */
	105	#else
	106	#define strtoll _strtoi64
	107	#include <sys/types.h>
	108	#include <sys/stat.h>
	109	#ifndef WIFEXITED
	110	# define WIFEXITED(stat) (((((int ) &(stat))) & 0xff) == 0)
	111	#endif
	112	#ifndef WEXITSTATUS
	113	# define WEXITSTATUS(stat) (((((int ) &(stat))) >> 8) & 0xff)
	114	#endif
	115	#ifndef S_ISREG
	116	//# ifdef S_IFREG
	117	//# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
	118	//# else
	119	# define S_ISREG(m) 1
	120	//# endif
	121	#endif /* !S_ISREG */
	122
	123	// For standard input/output handles
	124	static STARTUPINFO winStartupInfo;
	125	#endif
	126
	127	/******************************************************************************************
	128	ENUMS and TYPES
	129	******************************************************************************************/
	130
	131	/* These flags (mainly pertaining to main_read() operations) are set in the
	132	* main_file->flags variable. All are related to with external decompression support.
	133	*
	134	* RD_FIRST causes the external decompression check when the input is first read.
	135	*
	136	* RD_NONEXTERNAL disables external decompression for reading a compressed input, in the
	137	* case of Xdelta inputs. Note: Xdelta is supported as an external compression type,
	138	* which makes is the reason for this flag. An example to justify this is: to create a
	139	* delta between two files that are VCDIFF-compressed. Two external Xdelta decoders are
	140	* run to supply decompressed source and target inputs to the Xdelta encoder. */
	141	typedef enum
	142	{
	143	RD_FIRST = (1 << 0),
	144	RD_NONEXTERNAL = (1 << 1),
	145	RD_EXTERNAL_V1 = (1 << 2),
	146	} xd3_read_flags;
	147
	148	/* main_file->mode values */
	149	typedef enum
	150	{
	151	XO_READ = 0,
	152	XO_WRITE = 1,
	153	} main_file_modes;
	154
	155	/* Main commands. For example, CMD_PRINTHDR is the "xdelta printhdr" command. */
	156	typedef enum
	157	{
	158	CMD_NONE = 0,
	159	CMD_PRINTHDR,
	160	CMD_PRINTHDRS,
	161	CMD_PRINTDELTA,
	162	#if XD3_ENCODER
	163	CMD_ENCODE,
	164	#endif
	165	CMD_DECODE,
	166	CMD_TEST,
	167	CMD_CONFIG,
	168	} xd3_cmd;
	169
	170	#if XD3_ENCODER
	171	#define CMD_DEFAULT CMD_ENCODE
	172	#define IS_ENCODE(cmd) (cmd == CMD_ENCODE)
	173	#else
	174	#define CMD_DEFAULT CMD_DECODE
	175	#define IS_ENCODE(cmd) (0)
	176	#endif
	177
	178	typedef struct _main_file main_file;
	179	typedef struct _main_extcomp main_extcomp;
	180	typedef struct _main_blklru main_blklru;
	181	typedef struct _main_blklru_list main_blklru_list;
	182
	183	/* The main_file object supports abstract system calls like open, close, read, write, seek,
	184	* stat. The program uses these to represent both seekable files and non-seekable files.
	185	* Source files must be seekable, but the target input and any output file do not require
	186	* seekability.
	187	*/
	188	struct _main_file
	189	{
	190	#if XD3_STDIO
	191	FILE *file;
	192	#elif XD3_POSIX
	193	int file;
	194	#elif XD3_WIN32
	195	HANDLE file;
	196	#endif
	197
	198	int mode; /* XO_READ and XO_WRITE */
	199	const char filename; / File name or /dev/stdin, /dev/stdout, /dev/stderr. */
	200	char filename_copy; / File name or /dev/stdin, /dev/stdout, /dev/stderr. */
	201	const char realname; / File name or /dev/stdin, /dev/stdout, /dev/stderr. */
	202	const main_extcomp compressor; / External compression struct. */
	203	int flags; /* RD_FIRST, RD_NONEXTERNAL, ... */
	204	xoff_t nread; /* for input position */
	205	xoff_t nwrite; /* for output position */
	206	uint8_t snprintf_buf; / internal snprintf() use */
	207	};
	208
	209	/* Various strings and magic values used to detect and call external compression. See
	210	* below for examples. */
	211	struct _main_extcomp
	212	{
	213	const char *recomp_cmdname;
	214	const char *recomp_options;
	215
	216	const char *decomp_cmdname;
	217	const char *decomp_options;
	218
	219	const char *ident;
	220	const char *magic;
	221	int magic_size;
	222	int flags;
	223	};
	224
	225	/* This file implements a small LRU of source blocks. For encoding purposes,
	226	* we prevent paging in blocks we've already scanned in the source (return
	227	* XD3_NOTAVAIL). */
	228	struct _main_blklru_list
	229	{
	230	main_blklru_list *next;
	231	main_blklru_list *prev;
	232	};
	233
	234	struct _main_blklru
	235	{
	236	uint8_t *blk;
	237	xoff_t blkno;
	238	main_blklru_list link;
	239	};
	240
	241	#define LRU_SIZE 32U
	242	#define XD3_MINSRCWINSZ XD3_ALLOCSIZE
	243
	244	/* ... represented as a list (no cache index). */
	245	XD3_MAKELIST(main_blklru_list,main_blklru,link);
	246
	247	// TODO:
	248	// struct _main_state
	249	// {
	250
	251	/* Program options: various command line flags and options. */
	252	static int option_stdout = 0;
	253	static int option_force = 0;
	254	static int option_verbose = 0;
	255	static int option_quiet = 0;
	256	static int option_use_appheader = 1;
	257	static uint8_t* option_appheader = NULL;
	258	static int option_use_secondary = 0;
	259	static char* option_secondary = NULL;
	260	static int option_use_checksum = 1;
	261	static int option_use_altcodetable = 0;
	262	static char* option_smatch_config = NULL;
	263	static int option_no_compress = 0;
	264	static int option_no_output = 0; /* do not open or write output */
	265	static const char *option_source_filename = NULL;
	266
	267	static int option_level = XD3_DEFAULT_LEVEL;
	268	static usize_t option_iopt_size = XD3_DEFAULT_IOPT_SIZE;
	269	static usize_t option_winsize = XD3_DEFAULT_WINSIZE;
	270	static usize_t option_srcwinsz = XD3_DEFAULT_SRCWINSZ;
	271	static usize_t option_sprevsz = XD3_DEFAULT_SPREVSZ;
	272
	273	/* These variables are supressed to avoid their use w/o support. main() warns
	274	* appropriately. */
	275	#if EXTERNAL_COMPRESSION
	276	static int option_decompress_inputs = 1;
	277	static int option_recompress_outputs = 1;
	278	#endif
	279
	280	/* This is for comparing "printdelta" output without attention to
	281	* copy-instruction modes. */
	282	#if VCDIFF_TOOLS
	283	static int option_print_cpymode = 1;
	284	#endif
	285
	286	/* Static variables */
	287	IF_DEBUG(static int main_mallocs = 0;)
	288
	289	static char* program_name = NULL;
	290	static uint8_t* appheader_used = NULL;
	291	static uint8_t* main_bdata = NULL;
	292
	293	/* The LRU: obviously this is shared by all callers. */
	294	static int lru_size = 0;
	295	static main_blklru lru = NULL; / array of lru_size elts */
	296	static main_blklru_list lru_list;
	297	static main_blklru_list lru_free;
	298	static int do_not_lru = 0; /* set to avoid lru, instead discard oldest */
	299
	300	static int lru_hits = 0;
	301	static int lru_misses = 0;
	302	static int lru_filled = 0;
	303
	304	/* Hacks for VCDIFF tools */
	305	static int allow_fake_source = 0;
	306
	307	/* This array of compressor types is compiled even if EXTERNAL_COMPRESSION is false just so
	308	* the program knows the mapping of IDENT->NAME. */
	309	static main_extcomp extcomp_types[] =
	310	{
	311	/* The entry for xdelta3 must be 0 because the program_name is set there. */
	312	{ "xdelta3", "-cfq", "xdelta3", "-dcfq", "X", "\xd6\xc3\xc4", 3, RD_NONEXTERNAL },
	313	{ "bzip2", "-cf", "bzip2", "-dcf", "B", "BZh", 3, 0 },
	314	{ "gzip", "-cf", "gzip", "-dcf", "G", "\037\213", 2, 0 },
	315	{ "compress", "-cf", "uncompress", "-cf", "Z", "\037\235", 2, 0 },
	316
	317	/* TODO: add commandline support for magic-less formats */
	318	/{ "lzma", "-cf", "lzma", "-dcf", "M", "]\000", 2, 0 },/
	319	};
	320
	321	// };
	322
	323	static void main_get_appheader (xd3_stream stream, main_file ifile,
	324	main_file output, main_file sfile);
	325
	326	static int main_help (void);
	327
	328	static int
	329	main_version (void)
	330	{
	331	/* $Format: " DP(RINT \"VERSION=3.$Xdelta3Version$\\n\");" $ */
	332	DP(RINT "VERSION=3.0q\n");
	333	return EXIT_SUCCESS;
	334	}
	335
	336	static int
	337	main_config (void)
	338	{
	339	main_version ();
	340
	341	DP(RINT "EXTERNAL_COMPRESSION=%d\n", EXTERNAL_COMPRESSION);
	342	DP(RINT "GENERIC_ENCODE_TABLES=%d\n", GENERIC_ENCODE_TABLES);
	343	DP(RINT "GENERIC_ENCODE_TABLES_COMPUTE=%d\n", GENERIC_ENCODE_TABLES_COMPUTE);
	344	DP(RINT "REGRESSION_TEST=%d\n", REGRESSION_TEST);
	345	DP(RINT "SECONDARY_DJW=%d\n", SECONDARY_DJW);
	346	DP(RINT "SECONDARY_FGK=%d\n", SECONDARY_FGK);
	347	DP(RINT "VCDIFF_TOOLS=%d\n", VCDIFF_TOOLS);
	348	DP(RINT "XD3_ALLOCSIZE=%d\n", XD3_ALLOCSIZE);
	349	DP(RINT "XD3_DEBUG=%d\n", XD3_DEBUG);
	350	DP(RINT "XD3_ENCODER=%d\n", XD3_ENCODER);
	351	DP(RINT "XD3_POSIX=%d\n", XD3_POSIX);
	352	DP(RINT "XD3_STDIO=%d\n", XD3_STDIO);
	353	DP(RINT "XD3_WIN32=%d\n", XD3_WIN32);
	354	DP(RINT "XD3_USE_LARGEFILE64=%d\n", XD3_USE_LARGEFILE64);
	355	DP(RINT "XD3_DEFAULT_LEVEL=%d\n", XD3_DEFAULT_LEVEL);
	356	DP(RINT "XD3_DEFAULT_IOPT_SIZE=%d\n", XD3_DEFAULT_IOPT_SIZE);
	357	DP(RINT "XD3_DEFAULT_SPREVSZ=%d\n", XD3_DEFAULT_SPREVSZ);
	358	DP(RINT "XD3_DEFAULT_SRCWINSZ=%d\n", XD3_DEFAULT_SRCWINSZ);
	359	DP(RINT "XD3_DEFAULT_WINSIZE=%d\n", XD3_DEFAULT_WINSIZE);
	360	DP(RINT "XD3_HARDMAXWINSIZE=%d\n", XD3_HARDMAXWINSIZE);
	361	DP(RINT "XD3_NODECOMPRESSSIZE=%d\n", XD3_NODECOMPRESSSIZE);
	362
	363	return EXIT_SUCCESS;
	364	}
	365
	366	static void
	367	reset_defaults(void)
	368	{
	369	option_stdout = 0;
	370	option_force = 0;
	371	option_verbose = 0;
	372	option_quiet = 0;
	373	option_appheader = NULL;
	374	option_use_secondary = 0;
	375	option_secondary = NULL;
	376	option_use_altcodetable = 0;
	377	option_smatch_config = NULL;
	378	option_no_compress = 0;
	379	option_no_output = 0;
	380	option_source_filename = NULL;
	381	program_name = NULL;
	382	appheader_used = NULL;
	383	main_bdata = NULL;
	384	lru_size = 0;
	385	lru = NULL;
	386	do_not_lru = 0;
	387	lru_hits = 0;
	388	lru_misses = 0;
	389	lru_filled = 0;
	390	allow_fake_source = 0;
	391	option_smatch_config = NULL;
	392
	393	option_use_appheader = 1;
	394	option_use_checksum = 1;
	395	#if EXTERNAL_COMPRESSION
	396	option_decompress_inputs = 1;
	397	option_recompress_outputs = 1;
	398	#endif
	399	#if VCDIFF_TOOLS
	400	option_print_cpymode = 1;
	401	#endif
	402	option_level = XD3_DEFAULT_LEVEL;
	403	option_iopt_size = XD3_DEFAULT_IOPT_SIZE;
	404	option_winsize = XD3_DEFAULT_WINSIZE;
	405	option_srcwinsz = XD3_DEFAULT_SRCWINSZ;
	406	option_sprevsz = XD3_DEFAULT_SPREVSZ;
	407	}
	408
	409	static void*
	410	main_malloc1 (usize_t size)
	411	{
	412	void* r = malloc (size);
	413	if (r == NULL) { XPR(NT "malloc: %s\n", xd3_mainerror (ENOMEM)); }
	414	else if (option_verbose > 3) { XPR(NT "malloc: %u: %p\n", size, r); }
	415	return r;
	416	}
	417
	418	static void*
	419	main_malloc (usize_t size)
	420	{
	421	void *r = main_malloc1 (size);
	422	if (r) { IF_DEBUG (main_mallocs += 1); }
	423	return r;
	424	}
	425
	426	static void*
	427	main_alloc (void *opaque,
	428	usize_t items,
	429	usize_t size)
	430	{
	431	return main_malloc1 (items * size);
	432	}
	433
	434	static void
	435	main_free1 (void opaque, void ptr)
	436	{
	437	if (option_verbose > 3) { XPR(NT "free: %p\n", ptr); }
	438	free (ptr);
	439	}
	440
	441	static void
	442	main_free (void *ptr)
	443	{
	444	if (ptr)
	445	{
	446	IF_DEBUG (main_mallocs -= 1);
	447	main_free1 (NULL, ptr);
	448	IF_DEBUG (XD3_ASSERT(main_mallocs >= 0));
	449	}
	450	}
	451
	452	/* This ensures that (ret = errno) always indicates failure, in case errno was
	453	* accidentally not set. If this prints there's a bug somewhere. */
	454	static int
	455	get_errno (void)
	456	{
	457	#ifndef _WIN32
	458	if (errno == 0)
	459	{
	460	XPR(NT "you found a bug: expected errno != 0\n");
	461	errno = XD3_INTERNAL;
	462	}
	463	return errno;
	464	#else
	465	DWORD errNum = GetLastError();
	466	if (errNum == NO_ERROR) {
	467	errNum = XD3_INTERNAL;
	468	}
	469	return errNum;
	470	#endif
	471	}
	472
	473	const char*
	474	xd3_mainerror(int err_num) {
	475	#ifndef _WIN32
	476	const char* x = xd3_strerror (err_num);
	477	if (x != NULL) {
	478	return x;
	479	}
	480	return strerror(err_num);
	481	#else
	482	static char err_buf[256];
	483	const char* x = xd3_strerror (err_num);
	484	if (x != NULL) {
	485	return x;
	486	}
	487	memset (err_buf, 0, 256);
	488	FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM \| FORMAT_MESSAGE_IGNORE_INSERTS,
	489	NULL, err_num,
	490	MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
	491	err_buf, 256, NULL);
	492	return err_buf;
	493	#endif
	494	}
	495
	496	static long
	497	get_millisecs_now (void)
	498	{
	499	#ifndef _WIN32
	500	struct timeval tv;
	501
	502	gettimeofday (& tv, NULL);
	503
	504	return (tv.tv_sec) * 1000L + (tv.tv_usec) / 1000;
	505	#else
	506	// Found this in an example on www.codeproject.com
	507	// It doesn't matter that the offset is Jan 1, 1601
	508	// Result is the numbre of 100 nanosecond units
	509	// 100ns * 10,000 = 1ms
	510	SYSTEMTIME st;
	511	FILETIME ft;
	512	__int64 pi = (__int64)&ft;
	513	GetLocalTime(&st);
	514	SystemTimeToFileTime(&st, &ft);
	515	return (long)((*pi) / 10000);
	516	#endif
	517	}
	518
	519	/* Always >= 1 millisec, right? */
	520	static long
	521	get_millisecs_since (void)
	522	{
	523	static long last = 0;
	524	long now = get_millisecs_now();
	525	long diff = now - last;
	526	last = now;
	527	return diff;
	528	}
	529
	530	static char*
	531	main_format_bcnt (xoff_t r, char *buf)
	532	{
	533	static const char* fmts[] = { "B", "KB", "MB", "GB" };
	534	int i;
	535
	536	for (i = 0; i < SIZEOF_ARRAY(fmts); i += 1)
	537	{
	538	if (r <= (10 * 1024) \|\| i == (-1 + (int)SIZEOF_ARRAY(fmts)))
	539	{
	540	sprintf (buf, "%"Q"u %s", r, fmts[i]);
	541	break;
	542	}
	543	r /= 1024;
	544	}
	545	return buf;
	546	}
	547
	548	static char*
	549	main_format_rate (xoff_t bytes, long millis, char *buf)
	550	{
	551	xoff_t r = (xoff_t)(1.0 * bytes / (1.0 * millis / 1000.0));
	552	static char lbuf[32];
	553
	554	main_format_bcnt (r, lbuf);
	555	sprintf (buf, "%s/sec", lbuf);
	556	return buf;
	557	}
	558
	559	static char*
	560	main_format_millis (long millis, char *buf)
	561	{
	562	if (millis < 1000) { sprintf (buf, "%lu ms", millis); }
	563	else if (millis < 10000) { sprintf (buf, "%.1f sec", millis / 1000.0); }
	564	else { sprintf (buf, "%lu sec", millis / 1000L); }
	565	return buf;
	566	}
	567
	568	/* A safe version of strtol for xoff_t. */
	569	static int
	570	main_strtoxoff (const char* s, xoff_t *xo, char which)
	571	{
	572	char *e;
	573	xoff_t x;
	574
	575	XD3_ASSERT(s && *s != 0);
	576
	577	{
	578	/* Should check LONG_MIN, LONG_MAX, LLONG_MIN, LLONG_MAX? */
	579	#if SIZEOF_XOFF_T == 4
	580	long xx = strtol (s, &e, 0);
	581	#else
	582	long long xx = strtoll (s, &e, 0);
	583	#endif
	584
	585	if (xx < 0)
	586	{
	587	XPR(NT "-%c: negative integer: %s\n", which, s);
	588	return EXIT_FAILURE;
	589	}
	590
	591	x = xx;
	592	}
	593
	594	if (*e != 0)
	595	{
	596	XPR(NT "-%c: invalid integer: %s\n", which, s);
	597	return EXIT_FAILURE;
	598	}
	599
	600	(*xo) = x;
	601	return 0;
	602	}
	603
	604	static int
	605	main_atou (const char* arg, usize_t *xo, usize_t low, usize_t high, char which)
	606	{
	607	xoff_t x;
	608	int ret;
	609
	610	if ((ret = main_strtoxoff (arg, & x, which))) { return ret; }
	611
	612	if (x < low)
	613	{
	614	XPR(NT "-%c: minimum value: %u\n", which, low);
	615	return EXIT_FAILURE;
	616	}
	617	if (high == 0)
	618	{
	619	high = USIZE_T_MAX;
	620	}
	621	if (x > high)
	622	{
	623	XPR(NT "-%c: maximum value: %u\n", which, high);
	624	return EXIT_FAILURE;
	625	}
	626	(*xo) = (usize_t)x;
	627	return 0;
	628	}
	629
	630	/******************************************************************************************
	631	FILE BASICS
	632	******************************************************************************************/
	633
	634	/* With all the variation in file system-call semantics, arguments, return values and
	635	* error-handling for the POSIX and STDIO file APIs, the insides of these functions make
	636	* me sick, which is why these wrappers exist. */
	637
	638	#define XOPEN_OPNAME (xfile->mode == XO_READ ? "read" : "write")
	639	#define XOPEN_STDIO (xfile->mode == XO_READ ? "rb" : "wb")
	640	#define XOPEN_POSIX (xfile->mode == XO_READ ? O_RDONLY : O_WRONLY \| O_CREAT \| O_TRUNC)
	641	#define XOPEN_MODE (xfile->mode == XO_READ ? 0 : 0666)
	642
	643	#define XF_ERROR(op, name, ret) \
	644	XPR(NT "file %s failed: %s: %s: %s\n", (op), XOPEN_OPNAME, (name), xd3_mainerror (ret))
	645
	646	#if XD3_STDIO
	647	#define XFNO(f) fileno(f->file)
	648	#define XSTDOUT_XF(f) { (f)->file = stdout; (f)->filename = "/dev/stdout"; }
	649	#define XSTDIN_XF(f) { (f)->file = stdin; (f)->filename = "/dev/stdin"; }
	650
	651	#elif XD3_POSIX
	652	#define XFNO(f) f->file
	653	#define XSTDOUT_XF(f) { (f)->file = STDOUT_FILENO; (f)->filename = "/dev/stdout"; }
	654	#define XSTDIN_XF(f) { (f)->file = STDIN_FILENO; (f)->filename = "/dev/stdin"; }
	655
	656	#elif XD3_WIN32
	657	#define XFNO(f) -1
	658	#define XSTDOUT_XF(f) { (f)->file = winStartupInfo.hStdOutput; (f)->filename = "(stdout)"; }
	659	#define XSTDIN_XF(f) { (f)->file = winStartupInfo.hStdInput; (f)->filename = "(stdin)"; }
	660	#endif
	661
	662	static void
	663	main_file_init (main_file *xfile)
	664	{
	665	memset (xfile, 0, sizeof (*xfile));
	666
	667	#if XD3_POSIX
	668	xfile->file = -1;
	669	#endif
	670	#if XD3_WIN32
	671	xfile->file = INVALID_HANDLE_VALUE;
	672	#endif
	673	}
	674
	675	static int
	676	main_file_isopen (main_file *xfile)
	677	{
	678	#if XD3_STDIO
	679	return xfile->file != NULL;
	680
	681	#elif XD3_POSIX
	682	return xfile->file != -1;
	683
	684	#elif XD3_WIN32
	685	return xfile->file != INVALID_HANDLE_VALUE;
	686	#endif
	687	}
	688
	689	static int
	690	main_file_close (main_file *xfile)
	691	{
	692	int ret = 0;
	693
	694	if (! main_file_isopen (xfile))
	695	{
	696	return 0;
	697	}
	698
	699	#if XD3_STDIO
	700	ret = fclose (xfile->file);
	701	xfile->file = NULL;
	702
	703	#elif XD3_POSIX
	704	ret = close (xfile->file);
	705	xfile->file = -1;
	706
	707	#elif XD3_WIN32
	708	if (!CloseHandle(xfile->file)) {
	709	ret = get_errno ();
	710	}
	711	xfile->file = INVALID_HANDLE_VALUE;
	712	#endif
	713
	714	if (ret != 0) { XF_ERROR ("close", xfile->filename, ret = get_errno ()); }
	715	return ret;
	716	}
	717
	718	static void
	719	main_file_cleanup (main_file *xfile)
	720	{
	721	if (main_file_isopen (xfile))
	722	{
	723	main_file_close (xfile);
	724	}
	725
	726	if (xfile->snprintf_buf != NULL)
	727	{
	728	main_free(xfile->snprintf_buf);
	729	xfile->snprintf_buf = NULL;
	730	}
	731
	732	if (xfile->filename_copy != NULL)
	733	{
	734	main_free(xfile->filename_copy);
	735	xfile->filename_copy = NULL;
	736	}
	737	}
	738
	739	static int
	740	main_file_open (main_file xfile, const char name, int mode)
	741	{
	742	int ret = 0;
	743
	744	xfile->mode = mode;
	745
	746	XD3_ASSERT (name != NULL);
	747	XD3_ASSERT (! main_file_isopen (xfile));
	748	if (name[0] == 0)
	749	{
	750	XPR(NT "invalid file name: empty string\n");
	751	return XD3_INVALID;
	752	}
	753
	754	#if XD3_STDIO
	755	xfile->file = fopen (name, XOPEN_STDIO);
	756
	757	ret = (xfile->file == NULL) ? get_errno () : 0;
	758
	759	#elif XD3_POSIX
	760	if ((ret = open (name, XOPEN_POSIX, XOPEN_MODE)) < 0)
	761	{
	762	ret = get_errno ();
	763	}
	764	else
	765	{
	766	xfile->file = ret;
	767	ret = 0;
	768	}
	769
	770	#elif XD3_WIN32
	771	xfile->file = CreateFile(name,
	772	(mode == XO_READ) ? GENERIC_READ : GENERIC_WRITE,
	773	FILE_SHARE_READ,
	774	NULL,
	775	(mode == XO_READ) ? OPEN_EXISTING : (option_force ? CREATE_ALWAYS : CREATE_NEW),
	776	FILE_ATTRIBUTE_NORMAL,
	777	NULL);
	778	if (xfile->file == INVALID_HANDLE_VALUE) {
	779	ret = get_errno ();
	780	}
	781	#endif
	782	if (ret) { XF_ERROR ("open", name, ret); }
	783	else { xfile->realname = name; xfile->nread = 0; }
	784	return ret;
	785	}
	786
	787	static int
	788	main_file_stat (main_file xfile, xoff_t size, int err_ifnoseek)
	789	{
	790	int ret = 0;
	791	#if XD3_WIN32
	792	LARGE_INTEGER li;
	793	if (GetFileSizeEx(xfile->file, &li) == 0) {
	794	ret = get_errno ();
	795	} else {
	796	*size = li.QuadPart;
	797	}
	798	#else
	799	struct stat sbuf;
	800	if (fstat (XFNO (xfile), & sbuf) < 0)
	801	{
	802	ret = get_errno ();
	803	if (err_ifnoseek) { XF_ERROR ("stat", xfile->filename, ret); }
	804	return ret;
	805	}
	806
	807	if (! S_ISREG (sbuf.st_mode))
	808	{
	809	if (err_ifnoseek) { XPR(NT "source file must be seekable: %s\n", xfile->filename); }
	810	return ESPIPE;
	811	}
	812	(*size) = sbuf.st_size;
	813	#endif
	814	return ret;
	815	}
	816
	817	static int
	818	main_file_exists (main_file *xfile)
	819	{
	820	struct stat sbuf;
	821	return stat (xfile->filename, & sbuf) == 0 && S_ISREG (sbuf.st_mode);
	822	}
	823
	824	#if (XD3_POSIX \|\| EXTERNAL_COMPRESSION)
	825	/* POSIX-generic code takes a function pointer to read() or write(). This calls the
	826	* function repeatedly until the buffer is full or EOF. The NREAD parameter is not
	827	* set for write, NULL is passed. Return is signed, < 0 indicate errors, otherwise
	828	* byte count. */
	829	typedef int (xd3_posix_func) (int fd, uint8_t *buf, usize_t size);
	830
	831	static int
	832	xd3_posix_io (int fd, uint8_t buf, usize_t size, xd3_posix_func func, usize_t *nread)
	833	{
	834	int ret;
	835	usize_t nproc = 0;
	836
	837	while (nproc < size)
	838	{
	839	int result = (*func) (fd, buf + nproc, size - nproc);
	840
	841	if (result < 0)
	842	{
	843	ret = get_errno ();
	844	if (ret != EAGAIN && ret != EINTR)
	845	{
	846	return ret;
	847	}
	848	result = 0;
	849	}
	850
	851	if (nread != NULL && result == 0) { break; }
	852
	853	nproc += result;
	854	}
	855	if (nread != NULL) { (*nread) = nproc; }
	856	return 0;
	857	}
	858	#endif
	859
	860	/* POSIX is unbuffered, while STDIO is buffered. main_file_read() should always be called
	861	* on blocks. */
	862	static int
	863	main_file_read (main_file *ifile,
	864	uint8_t *buf,
	865	usize_t size,
	866	usize_t *nread,
	867	const char *msg)
	868	{
	869	int ret = 0;
	870
	871	#if XD3_STDIO
	872	usize_t result;
	873
	874	result = fread (buf, 1, size, ifile->file);
	875
	876	if (result < size && ferror (ifile->file))
	877	{
	878	ret = get_errno ();
	879	}
	880	else
	881	{
	882	*nread = result;
	883	}
	884
	885	#elif XD3_POSIX
	886	ret = xd3_posix_io (ifile->file, buf, size, (xd3_posix_func*) &read, nread);
	887
	888	#elif XD3_WIN32
	889	DWORD nread2;
	890	if (ReadFile (ifile->file, buf, size, &nread2, NULL) == 0) {
	891	ret = get_errno();
	892	} else {
	893	*nread = (usize_t)nread2;
	894	}
	895	#endif
	896
	897	if (ret)
	898	{
	899	XPR(NT "%s: %s: %s\n", msg, ifile->filename, xd3_mainerror (ret));
	900	}
	901	else
	902	{
	903	if (option_verbose > 3) { XPR(NT "main read: %s: %u\n", ifile->filename, (*nread)); }
	904	ifile->nread += (*nread);
	905	}
	906
	907	return ret;
	908	}
	909
	910	static int
	911	main_file_write (main_file ofile, uint8_t buf, usize_t size, const char *msg)
	912	{
	913	int ret = 0;
	914
	915	#if XD3_STDIO
	916	usize_t result;
	917
	918	result = fwrite (buf, 1, size, ofile->file);
	919
	920	if (result != size) { ret = get_errno (); }
	921
	922	#elif XD3_POSIX
	923	ret = xd3_posix_io (ofile->file, buf, size, (xd3_posix_func*) &write, NULL);
	924
	925	#elif XD3_WIN32
	926	DWORD nwrite;
	927	if (WriteFile(ofile->file, buf, size, &nwrite, NULL) == 0) {
	928	ret = get_errno ();
	929	} else {
	930	if (size != nwrite) {
	931	XPR(NT "Incorrect write count");
	932	ret = XD3_INTERNAL;
	933	}
	934	}
	935	#endif
	936
	937	if (ret)
	938	{
	939	XPR(NT "%s: %s: %s\n", msg, ofile->filename, xd3_mainerror (ret));
	940	}
	941	else
	942	{
	943	if (option_verbose > 3) { XPR(NT "main write: %s: %u\n", ofile->filename, size); }
	944	ofile->nwrite += size;
	945	}
	946
	947	return ret;
	948	}
	949
	950	static int
	951	main_file_seek (main_file *xfile, xoff_t pos)
	952	{
	953	int ret = 0;
	954
	955	#if XD3_STDIO
	956	if (fseek (xfile->file, pos, SEEK_SET) != 0) { ret = get_errno (); }
	957
	958	#elif XD3_POSIX
	959	if (lseek (xfile->file, pos, SEEK_SET) != pos) { ret = get_errno (); }
	960
	961	#elif XD3_WIN32
	962	LARGE_INTEGER move, out;
	963	move.QuadPart = pos;
	964	if (SetFilePointerEx(xfile->file, move, &out, FILE_BEGIN) == 0) {
	965	ret = get_errno ();
	966	}
	967	#endif
	968
	969	if (ret)
	970	{
	971	XPR(NT "seek failed: %s: %s\n", xfile->filename, xd3_mainerror (ret));
	972	}
	973
	974	return ret;
	975	}
	976
	977	/******************************************************************************************
	978	VCDIFF TOOLS
	979	******************************************************************************************/
	980
	981	#if VCDIFF_TOOLS
	982
	983	/* The following macros let VCDIFF printing something printf-like with
	984	* main_file_write(), e.g.,:
	985	*
	986	* VC(UT "trying to be portable: %d\n", x)VE;
	987	*/
	988	#define SNPRINTF_BUFSIZE 1024
	989	#define VC do { if (((ret = snprintf
	990	#define UT (char*)xfile->snprintf_buf, SNPRINTF_BUFSIZE,
	991	#define VE ) >= SNPRINTF_BUFSIZE \
	992	&& (ret = main_print_overflow(ret)) != 0) \
	993	\|\| (ret = main_file_write(xfile, xfile->snprintf_buf, \
	994	ret, "print")) != 0) \
	995	{ return ret; } } while (0)
	996
	997	#ifdef WIN32
	998	/* According to the internet, Windows vsnprintf() differs from most Unix
	999	* implementations regarding the terminating 0 when the boundary condition
	1000	* is met. It doesn't matter here, we don't rely on the trailing 0. */
	1001	#include <stdarg.h>
	1002	int
	1003	snprintf (char str, int n, char fmt, ...)
	1004	{
	1005	va_list a;
	1006	int ret;
	1007	va_start (a, fmt);
	1008	ret = vsnprintf (str, n, fmt, a);
	1009	va_end (a);
	1010	return ret;
	1011	}
	1012	#endif
	1013
	1014	static int
	1015	main_print_overflow (int x)
	1016	{
	1017	XPR(NT "internal print buffer overflow: %d bytes\n", x);
	1018	return XD3_INTERNAL;
	1019	}
	1020
	1021	/* This function prints a single VCDIFF window. */
	1022	static int
	1023	main_print_window (xd3_stream* stream, main_file *xfile)
	1024	{
	1025	int ret;
	1026	usize_t size = 0;
	1027
	1028	VC(UT " Offset Code Type1 Size1 @Addr1 + Type2 Size2 @Addr2\n")VE;
	1029
	1030	while (stream->inst_sect.buf < stream->inst_sect.buf_max)
	1031	{
	1032	uint code = stream->inst_sect.buf[0];
	1033
	1034	if ((ret = xd3_decode_instruction (stream))) { return ret; }
	1035
	1036	VC(UT " %06"Q"u %03u %s %3u", stream->dec_winstart + size, code,
	1037	xd3_rtype_to_string (stream->dec_current1.type, option_print_cpymode),
	1038	(usize_t) stream->dec_current1.size)VE;
	1039
	1040	if (stream->dec_current1.type != XD3_NOOP)
	1041	{
	1042	size += stream->dec_current1.size;
	1043	if (stream->dec_current1.type >= XD3_CPY)
	1044	{
	1045	VC(UT " @%-6u", (usize_t)stream->dec_current1.addr)VE;
	1046	}
	1047	else
	1048	{
	1049	VC(UT " ")VE;
	1050	}
	1051	}
	1052
	1053	if (stream->dec_current2.type != XD3_NOOP)
	1054	{
	1055	size += stream->dec_current2.size;
	1056	VC(UT " %s %3u",
	1057	xd3_rtype_to_string (stream->dec_current2.type, option_print_cpymode),
	1058	(usize_t)stream->dec_current2.size)VE;
	1059
	1060	if (stream->dec_current2.type >= XD3_CPY)
	1061	{
	1062	VC(UT " @%-6u", (usize_t)stream->dec_current2.addr)VE;
	1063	}
	1064	}
	1065
	1066	VC(UT "\n")VE;
	1067	}
	1068
	1069	if (stream->dec_tgtlen != size && (stream->flags & XD3_SKIP_WINDOW) == 0)
	1070	{
	1071	XPR(NT "target window size inconsistency");
	1072	return XD3_INTERNAL;
	1073	}
	1074
	1075	if (stream->dec_position != stream->dec_maxpos)
	1076	{
	1077	XPR(NT "target window position inconsistency");
	1078	return XD3_INTERNAL;
	1079	}
	1080
	1081	if (stream->addr_sect.buf != stream->addr_sect.buf_max)
	1082	{
	1083	XPR(NT "address section inconsistency");
	1084	return XD3_INTERNAL;
	1085	}
	1086
	1087	return 0;
	1088	}
	1089
	1090	static int
	1091	main_print_vcdiff_file (main_file xfile, main_file file, const char *type)
	1092	{
	1093	int ret; /* Used by above macros */
	1094	if (file->filename)
	1095	{
	1096	VC(UT "XDELTA filename (%s): %s\n", type, file->filename)VE;
	1097	}
	1098	if (file->compressor)
	1099	{
	1100	VC(UT "XDELTA ext comp (%s): %s\n", type, file->compressor->recomp_cmdname)VE;
	1101	}
	1102	return 0;
	1103	}
	1104
	1105	/* This function prints a VCDIFF input, mainly for debugging purposes. */
	1106	static int
	1107	main_print_func (xd3_stream* stream, main_file *xfile)
	1108	{
	1109	int ret;
	1110
	1111	if (xfile->snprintf_buf == NULL)
	1112	{
	1113	if ((xfile->snprintf_buf = main_malloc(SNPRINTF_BUFSIZE)) == NULL)
	1114	{
	1115	return ENOMEM;
	1116	}
	1117	}
	1118
	1119	if (stream->dec_winstart == 0)
	1120	{
	1121	VC(UT "VCDIFF version: 0\n")VE;
	1122
	1123	VC(UT "VCDIFF header size: %d\n", stream->dec_hdrsize)VE;
	1124	VC(UT "VCDIFF header indicator: ")VE;
	1125	if ((stream->dec_hdr_ind & VCD_SECONDARY) != 0) VC(UT "VCD_SECONDARY ")VE;
	1126	if ((stream->dec_hdr_ind & VCD_CODETABLE) != 0) VC(UT "VCD_CODETABLE ")VE;
	1127	if ((stream->dec_hdr_ind & VCD_APPHEADER) != 0) VC(UT "VCD_APPHEADER ")VE;
	1128	if (stream->dec_hdr_ind == 0) VC(UT "none")VE;
	1129	VC(UT "\n")VE;
	1130
	1131	IF_SEC(VC(UT "VCDIFF secondary compressor: %s\n",
	1132	stream->sec_type ? stream->sec_type->name : "none")VE);
	1133	IF_NSEC(VC(UT "VCDIFF secondary compressor: unsupported\n")VE);
	1134
	1135	if (stream->dec_hdr_ind & VCD_APPHEADER)
	1136	{
	1137	uint8_t *apphead;
	1138	usize_t appheadsz;
	1139	ret = xd3_get_appheader (stream, & apphead, & appheadsz);
	1140
	1141	if (ret == 0 && appheadsz > 0)
	1142	{
	1143	int sq = option_quiet;
	1144	main_file i, o, s;
	1145	XD3_ASSERT (apphead != NULL);
	1146	VC(UT "VCDIFF application header: ")VE;
	1147	if ((ret = main_file_write (xfile, apphead, appheadsz, "print")) != 0) { return ret; }
	1148	VC(UT "\n")VE;
	1149
	1150	main_file_init (& i);
	1151	main_file_init (& o);
	1152	main_file_init (& s);
	1153	option_quiet = 1;
	1154	main_get_appheader (stream, &i, & o, & s);
	1155	option_quiet = sq;
	1156	if ((ret = main_print_vcdiff_file (xfile, & o, "output"))) { return ret; }
	1157	if ((ret = main_print_vcdiff_file (xfile, & s, "source"))) { return ret; }
	1158	main_file_cleanup (& i);
	1159	main_file_cleanup (& o);
	1160	main_file_cleanup (& s);
	1161	}
	1162	}
	1163	}
	1164	else
	1165	{
	1166	VC(UT "\n")VE;
	1167	}
	1168
	1169	VC(UT "VCDIFF window number: %"Q"u\n", stream->current_window)VE;
	1170	VC(UT "VCDIFF window indicator: ")VE;
	1171	if ((stream->dec_win_ind & VCD_SOURCE) != 0) VC(UT "VCD_SOURCE ")VE;
	1172	if ((stream->dec_win_ind & VCD_TARGET) != 0) VC(UT "VCD_TARGET ")VE;
	1173	if ((stream->dec_win_ind & VCD_ADLER32) != 0) VC(UT "VCD_ADLER32 ")VE;
	1174	if (stream->dec_win_ind == 0) VC(UT "none")VE;
	1175	VC(UT "\n")VE;
	1176
	1177	if ((stream->dec_win_ind & VCD_ADLER32) != 0)
	1178	{
	1179	VC(UT "VCDIFF adler32 checksum: %08X\n", (usize_t)stream->dec_adler32)VE;
	1180	}
	1181
	1182	if (stream->dec_del_ind != 0)
	1183	{
	1184	VC(UT "VCDIFF delta indicator: ")VE;
	1185	if ((stream->dec_del_ind & VCD_DATACOMP) != 0) VC(UT "VCD_DATACOMP ")VE;
	1186	if ((stream->dec_del_ind & VCD_INSTCOMP) != 0) VC(UT "VCD_INSTCOMP ")VE;
	1187	if ((stream->dec_del_ind & VCD_ADDRCOMP) != 0) VC(UT "VCD_ADDRCOMP ")VE;
	1188	if (stream->dec_del_ind == 0) VC(UT "none")VE;
	1189	VC(UT "\n")VE;
	1190	}
	1191
	1192	if (stream->dec_winstart != 0)
	1193	{
	1194	VC(UT "VCDIFF window at offset: %"Q"u\n", stream->dec_winstart)VE;
	1195	}
	1196
	1197	if (SRCORTGT (stream->dec_win_ind))
	1198	{
	1199	VC(UT "VCDIFF copy window length: %u\n", (usize_t)stream->dec_cpylen)VE;
	1200	VC(UT "VCDIFF copy window offset: %"Q"u\n", stream->dec_cpyoff)VE;
	1201	}
	1202
	1203	VC(UT "VCDIFF delta encoding length: %u\n", (usize_t)stream->dec_enclen)VE;
	1204	VC(UT "VCDIFF target window length: %u\n", (usize_t)stream->dec_tgtlen)VE;
	1205
	1206	VC(UT "VCDIFF data section length: %u\n", (usize_t)stream->data_sect.size)VE;
	1207	VC(UT "VCDIFF inst section length: %u\n", (usize_t)stream->inst_sect.size)VE;
	1208	VC(UT "VCDIFF addr section length: %u\n", (usize_t)stream->addr_sect.size)VE;
	1209
	1210	ret = 0;
	1211	if ((stream->flags & XD3_JUST_HDR) != 0)
	1212	{
	1213	/* Print a header -- finished! */
	1214	ret = PRINTHDR_SPECIAL;
	1215	}
	1216	else if ((stream->flags & XD3_SKIP_WINDOW) == 0)
	1217	{
	1218	ret = main_print_window (stream, xfile);
	1219	}
	1220
	1221	return ret;
	1222	}
	1223	#endif /* VCDIFF_TOOLS */
	1224
	1225	/******************************************************************************************
	1226	Input decompression, output recompression
	1227	******************************************************************************************/
	1228
	1229	#if EXTERNAL_COMPRESSION
	1230	/* This is tricky POSIX-specific code with lots of fork(), pipe(), dup(), waitpid(), and
	1231	* exec() business. Most of this code originated in PRCS1, which did automatic
	1232	* package-file decompression. It works with both XD3_POSIX and XD3_STDIO file
	1233	* disciplines.
	1234	*
	1235	* To automatically detect compressed inputs requires a child process to reconstruct the
	1236	* input stream, which was advanced in order to detect compression, because it may not be
	1237	* seekable. In other words, the main program reads part of the input stream, and if it
	1238	* detects a compressed input it then forks a pipe copier process, which copies the
	1239	* first-read block out of the main-program's memory, then streams the remaining
	1240	* compressed input into the input-decompression pipe.
	1241	*/
	1242
	1243	#include <unistd.h>
	1244	#include <sys/stat.h>
	1245	#include <sys/wait.h>
	1246
	1247	/* Remember which pipe FD is which. */
	1248	#define PIPE_READ_FD 0
	1249	#define PIPE_WRITE_FD 1
	1250
	1251	static pid_t ext_subprocs[2];
	1252	static char* ext_tmpfile = NULL;
	1253
	1254	/* Like write(), but makes repeated calls to empty the buffer. */
	1255	static int
	1256	main_pipe_write (int outfd, const uint8_t *exist_buf, usize_t remain)
	1257	{
	1258	int ret;
	1259
	1260	if ((ret = xd3_posix_io (outfd, (uint8_t) exist_buf, remain, (xd3_posix_func) &write, NULL)))
	1261	{
	1262	XPR(NT "pipe write failed: %s", xd3_mainerror (ret));
	1263	return ret;
	1264	}
	1265
	1266	return 0;
	1267	}
	1268
	1269	/* A simple error-reporting waitpid interface. */
	1270	static int
	1271	main_waitpid_check(pid_t pid)
	1272	{
	1273	int status;
	1274	int ret = 0;
	1275
	1276	if (waitpid (pid, & status, 0) < 0)
	1277	{
	1278	ret = get_errno ();
	1279	XPR(NT "compression subprocess: wait: %s\n", xd3_mainerror (ret));
	1280	}
	1281	else if (! WIFEXITED (status))
	1282	{
	1283	ret = ECHILD;
	1284	XPR(NT "compression subprocess: signal %d\n",
	1285	WIFSIGNALED (status) ? WTERMSIG (status) : WSTOPSIG (status));
	1286	}
	1287	else if (WEXITSTATUS (status) != 0)
	1288	{
	1289	ret = ECHILD;
	1290	XPR(NT "compression subprocess: exit %d\n", WEXITSTATUS (status));
	1291	}
	1292
	1293	return ret;
	1294	}
	1295
	1296	/* Wait for any existing child processes to check for abnormal exit. */
	1297	static int
	1298	main_external_compression_finish (void)
	1299	{
	1300	int i;
	1301	int ret;
	1302
	1303	for (i = 0; i < 2; i += 1)
	1304	{
	1305	if (! ext_subprocs[i]) { continue; }
	1306
	1307	if ((ret = main_waitpid_check (ext_subprocs[i])))
	1308	{
	1309	return ret;
	1310	}
	1311	}
	1312
	1313	return 0;
	1314	}
	1315
	1316	/* This runs as a forked process of main_input_decompress_setup() to copy input to the
	1317	* decompression process. First, the available input is copied out of the existing
	1318	* buffer, then the buffer is reused to continue reading from the compressed input
	1319	* file. */
	1320	static int
	1321	main_pipe_copier (uint8_t *pipe_buf,
	1322	usize_t pipe_bufsize,
	1323	usize_t nread,
	1324	main_file *ifile,
	1325	int outfd)
	1326	{
	1327	int ret;
	1328
	1329	for (;;)
	1330	{
	1331	if (nread > 0 && (ret = main_pipe_write (outfd, pipe_buf, nread)))
	1332	{
	1333	return ret;
	1334	}
	1335
	1336	if (nread < pipe_bufsize)
	1337	{
	1338	break;
	1339	}
	1340
	1341	if ((ret = main_file_read (ifile, pipe_buf, pipe_bufsize, & nread, "pipe read failed")) < 0)
	1342	{
	1343	return ret;
	1344	}
	1345	}
	1346
	1347	return 0;
	1348	}
	1349
	1350	/* This function is called after we have read some amount of data from the input file and
	1351	* detected a compressed input. Here we start a decompression subprocess by forking
	1352	* twice. The first process runs the decompression command, the second process copies
	1353	* data to the input of the first. */
	1354	static int
	1355	main_input_decompress_setup (const main_extcomp *decomp,
	1356	main_file *ifile,
	1357	uint8_t *input_buf,
	1358	usize_t input_bufsize,
	1359	uint8_t *pipe_buf,
	1360	usize_t pipe_bufsize,
	1361	usize_t pipe_avail,
	1362	usize_t *nread)
	1363	{
	1364	int outpipefd[2], inpipefd[2]; /* The two pipes: input and output file descriptors. */
	1365	int input_fd = -1; /* The resulting input_fd (output of decompression). */
	1366	pid_t decomp_id, copier_id; /* The two subprocs. */
	1367	int ret;
	1368
	1369	outpipefd[0] = outpipefd[1] = -1;
	1370	inpipefd[0] = inpipefd[1] = -1;
	1371
	1372	if (pipe (outpipefd) \|\| pipe (inpipefd))
	1373	{
	1374	XPR(NT "pipe failed: %s\n", xd3_mainerror (ret = get_errno ()));
	1375	goto pipe_cleanup;
	1376	}
	1377
	1378	if ((decomp_id = fork ()) < 0)
	1379	{
	1380	XPR(NT "fork failed: %s\n", xd3_mainerror (ret = get_errno ()));
	1381	goto pipe_cleanup;
	1382	}
	1383
	1384	/* The first child runs the decompression process: */
	1385	if (decomp_id == 0)
	1386	{
	1387	/* Setup pipes: write to the outpipe, read from the inpipe. */
	1388	if (dup2 (outpipefd[PIPE_WRITE_FD], STDOUT_FILENO) < 0 \|\|
	1389	dup2 (inpipefd[PIPE_READ_FD], STDIN_FILENO) < 0 \|\|
	1390	close (outpipefd[PIPE_READ_FD]) \|\|
	1391	close (outpipefd[PIPE_WRITE_FD]) \|\|
	1392	close (inpipefd[PIPE_READ_FD]) \|\|
	1393	close (inpipefd[PIPE_WRITE_FD]) \|\|
	1394	execlp (decomp->decomp_cmdname, decomp->decomp_cmdname, decomp->decomp_options, NULL))
	1395	{
	1396	XPR(NT "child process %s failed to execute: %s\n", decomp->decomp_cmdname, xd3_mainerror (get_errno ()));
	1397	}
	1398
	1399	_exit (127);
	1400	}
	1401
	1402	ext_subprocs[0] = decomp_id;
	1403
	1404	if ((copier_id = fork ()) < 0)
	1405	{
	1406	XPR(NT "fork failed: %s\n", xd3_mainerror (ret = get_errno ()));
	1407	goto pipe_cleanup;
	1408	}
	1409
	1410	/* The second child runs the copier process: */
	1411	if (copier_id == 0)
	1412	{
	1413	int exitval = 0;
	1414
	1415	if (close (inpipefd[PIPE_READ_FD]) \|\|
	1416	main_pipe_copier (pipe_buf, pipe_bufsize, pipe_avail, ifile, inpipefd[PIPE_WRITE_FD]) \|\|
	1417	close (inpipefd[PIPE_WRITE_FD]))
	1418	{
	1419	XPR(NT "child copier process failed: %s\n", xd3_mainerror (get_errno ()));
	1420	exitval = 1;
	1421	}
	1422
	1423	_exit (exitval);
	1424	}
	1425
	1426	ext_subprocs[1] = copier_id;
	1427
	1428	/* The parent closes both pipes after duplicating the output of compression. */
	1429	input_fd = dup (outpipefd[PIPE_READ_FD]);
	1430
	1431	if (input_fd < 0 \|\|
	1432	main_file_close (ifile) \|\|
	1433	close (outpipefd[PIPE_READ_FD]) \|\|
	1434	close (outpipefd[PIPE_WRITE_FD]) \|\|
	1435	close (inpipefd[PIPE_READ_FD]) \|\|
	1436	close (inpipefd[PIPE_WRITE_FD]))
	1437	{
	1438	XPR(NT "dup/close failed: %s\n", xd3_mainerror (ret = get_errno ()));
	1439	goto pipe_cleanup;
	1440	}
	1441
	1442	#if XD3_STDIO
	1443	/* Note: fdopen() acquires the fd, closes it when finished. */
	1444	if ((ifile->file = fdopen (input_fd, "r")) == NULL)
	1445	{
	1446	XPR(NT "fdopen failed: %s\n", xd3_mainerror (ret = get_errno ()));
	1447	goto pipe_cleanup;
	1448	}
	1449
	1450	#elif XD3_POSIX
	1451	ifile->file = input_fd;
	1452	#endif
	1453
	1454	ifile->compressor = decomp;
	1455
	1456	/* Now the input file is decompressed. */
	1457	return main_file_read (ifile, input_buf, input_bufsize, nread, "input decompression failed");
	1458
	1459	pipe_cleanup:
	1460	close (input_fd);
	1461	close (outpipefd[PIPE_READ_FD]);
	1462	close (outpipefd[PIPE_WRITE_FD]);
	1463	close (inpipefd[PIPE_READ_FD]);
	1464	close (inpipefd[PIPE_WRITE_FD]);
	1465	return ret;
	1466	}
	1467
	1468
	1469	/* This routine is called when the first buffer of input data is read by the main program
	1470	* (unless input decompression is disabled by command-line option). If it recognizes the
	1471	* magic number of a known input type it invokes decompression.
	1472	*
	1473	* Skips decompression if the decompression type or the file type is RD_NONEXTERNAL.
	1474	*
	1475	* Behaves exactly like main_file_read, otherwise.
	1476	*
	1477	* This function uses a separate buffer to read the first small block of input. If a
	1478	* compressed input is detected, the separate buffer is passed to the pipe copier. This
	1479	* avoids using the same size buffer in both cases. */
	1480	static int
	1481	main_decompress_input_check (main_file *ifile,
	1482	uint8_t *input_buf,
	1483	usize_t input_size,
	1484	usize_t *nread)
	1485	{
	1486	int i;
	1487	int ret;
	1488	uint8_t check_buf[XD3_ALLOCSIZE];
	1489	usize_t check_nread;
	1490
	1491	if ((ret = main_file_read (ifile, check_buf, min (input_size, XD3_ALLOCSIZE), & check_nread, "input read failed")))
	1492	{
	1493	return ret;
	1494	}
	1495
	1496	for (i = 0; i < SIZEOF_ARRAY (extcomp_types); i += 1)
	1497	{
	1498	const main_extcomp *decomp = & extcomp_types[i];
	1499
	1500	if ((check_nread > decomp->magic_size) &&
	1501	/* The following expr skips decompression if we are trying to read a VCDIFF
	1502	* input and that is the magic number. */
	1503	!((decomp->flags & RD_NONEXTERNAL) && (ifile->flags & RD_NONEXTERNAL)) &&
	1504	memcmp (check_buf, decomp->magic, decomp->magic_size) == 0)
	1505	{
	1506	if (! option_quiet)
	1507	{
	1508	XPR(NT "%s \| %s %s\n",
	1509	ifile->filename,
	1510	decomp->decomp_cmdname,
	1511	decomp->decomp_options);
	1512	}
	1513
	1514	return main_input_decompress_setup (decomp, ifile,
	1515	input_buf, input_size,
	1516	check_buf, XD3_ALLOCSIZE,
	1517	check_nread, nread);
	1518	}
	1519	}
	1520
	1521	/* Now read the rest of the input block. */
	1522	(*nread) = 0;
	1523
	1524	if (check_nread == XD3_ALLOCSIZE)
	1525	{
	1526	ret = main_file_read (ifile, input_buf + XD3_ALLOCSIZE,
	1527	input_size - XD3_ALLOCSIZE, nread,
	1528	"input read failed");
	1529	}
	1530
	1531	memcpy (input_buf, check_buf, check_nread);
	1532
	1533	(*nread) += check_nread;
	1534
	1535	return 0;
	1536	}
	1537
	1538	/* This is called when the source file needs to be decompressed. We fork/exec a
	1539	* decompression command with the proper input and output to a temporary file. */
	1540	static int
	1541	main_decompress_source (main_file sfile, xd3_source source)
	1542	{
	1543	const main_extcomp *decomp = sfile->compressor;
	1544	pid_t decomp_id; /* One subproc. */
	1545	int input_fd = -1;
	1546	int output_fd = -1;
	1547	int ret;
	1548	char *tmpname = NULL;
	1549	char *tmpdir = getenv ("TMPDIR");
	1550	static const char tmpl[] = "/xd3src.XXXXXX";
	1551
	1552	/* Make a template for mkstmp() */
	1553	if (tmpdir == NULL) { tmpdir = "/tmp"; }
	1554	if ((tmpname = main_malloc (strlen (tmpdir) + sizeof (tmpl) + 1)) == NULL) { return ENOMEM; }
	1555	sprintf (tmpname, "%s%s", tmpdir, tmpl);
	1556
	1557	XD3_ASSERT (ext_tmpfile == NULL);
	1558	ext_tmpfile = tmpname;
	1559
	1560	/* Open the output FD. */
	1561	if ((output_fd = mkstemp (tmpname)) < 0)
	1562	{
	1563	XPR(NT "mkstemp failed: %s: %s", tmpname, xd3_mainerror (ret = get_errno ()));
	1564	goto cleanup;
	1565	}
	1566
	1567	/* Copy the input FD, reset file position. */
	1568	XD3_ASSERT (main_file_isopen (sfile));
	1569	#if XD3_STDIO
	1570	if ((input_fd = dup (fileno (sfile->file))) < 0)
	1571	{
	1572	XPR(NT "dup failed: %s", xd3_mainerror (ret = get_errno ()));
	1573	goto cleanup;
	1574	}
	1575	main_file_close (sfile);
	1576	sfile->file = NULL;
	1577	#elif XD3_POSIX
	1578	input_fd = sfile->file;
	1579	sfile->file = -1;
	1580	#endif
	1581
	1582	if ((ret = lseek (input_fd, SEEK_SET, 0)) != 0)
	1583	{
	1584	XPR(NT "lseek failed: : %s", xd3_mainerror (ret = get_errno ()));
	1585	goto cleanup;
	1586	}
	1587
	1588	if ((decomp_id = fork ()) < 0)
	1589	{
	1590	XPR(NT "fork failed: %s", xd3_mainerror (ret = get_errno ()));
	1591	goto cleanup;
	1592	}
	1593
	1594	/* The child runs the decompression process: */
	1595	if (decomp_id == 0)
	1596	{
	1597	/* Setup pipes: write to the output file, read from the pipe. */
	1598	if (dup2 (input_fd, STDIN_FILENO) < 0 \|\|
	1599	dup2 (output_fd, STDOUT_FILENO) < 0 \|\|
	1600	execlp (decomp->decomp_cmdname, decomp->decomp_cmdname, decomp->decomp_options, NULL))
	1601	{
	1602	XPR(NT "child process %s failed to execute: %s\n",
	1603	decomp->decomp_cmdname, xd3_mainerror (get_errno ()));
	1604	}
	1605
	1606	_exit (127);
	1607	}
	1608
	1609	close (input_fd);
	1610	close (output_fd);
	1611	input_fd = -1;
	1612	output_fd = -1;
	1613
	1614	/* Then wait for completion. */
	1615	if ((ret = main_waitpid_check (decomp_id)))
	1616	{
	1617	goto cleanup;
	1618	}
	1619
	1620	/* Open/stat the decompressed source file. */
	1621	if ((ret = main_file_open (sfile, tmpname, XO_READ))) { goto cleanup; }
	1622	if ((ret = main_file_stat (sfile, & source->size, 1))) { goto cleanup; }
	1623	return 0;
	1624
	1625	cleanup:
	1626	close (input_fd);
	1627	close (output_fd);
	1628	if (tmpname) { free (tmpname); }
	1629	ext_tmpfile = NULL;
	1630	return ret;
	1631	}
	1632
	1633	/* Initiate re-compression of the output stream. This is easier than input decompression
	1634	* because we know beforehand that the stream will be compressed, whereas the input has
	1635	* already been read when we decide it should be decompressed. Thus, it only requires one
	1636	* subprocess and one pipe. */
	1637	static int
	1638	main_recompress_output (main_file *ofile)
	1639	{
	1640	pid_t recomp_id; /* One subproc. */
	1641	int pipefd[2]; /* One pipe. */
	1642	int output_fd = -1;
	1643	int ret;
	1644	const main_extcomp *recomp = ofile->compressor;
	1645
	1646	pipefd[0] = pipefd[1] = -1;
	1647
	1648	if (pipe (pipefd))
	1649	{
	1650	XPR(NT "pipe failed: %s\n", xd3_mainerror (ret = get_errno ()));
	1651	goto pipe_cleanup;
	1652	}
	1653
	1654	if ((recomp_id = fork ()) < 0)
	1655	{
	1656	XPR(NT "fork failed: %s\n", xd3_mainerror (ret = get_errno ()));
	1657	goto pipe_cleanup;
	1658	}
	1659
	1660	/* The child runs the recompression process: */
	1661	if (recomp_id == 0)
	1662	{
	1663	/* Setup pipes: write to the output file, read from the pipe. */
	1664	if (dup2 (XFNO (ofile), STDOUT_FILENO) < 0 \|\|
	1665	dup2 (pipefd[PIPE_READ_FD], STDIN_FILENO) < 0 \|\|
	1666	close (pipefd[PIPE_READ_FD]) \|\|
	1667	close (pipefd[PIPE_WRITE_FD]) \|\|
	1668	execlp (recomp->recomp_cmdname, recomp->recomp_cmdname, recomp->recomp_options, NULL))
	1669	{
	1670	XPR(NT "child process %s failed to execute: %s\n", recomp->recomp_cmdname, xd3_mainerror (get_errno ()));
	1671	}
	1672
	1673	_exit (127);
	1674	}
	1675
	1676	ext_subprocs[0] = recomp_id;
	1677
	1678	/* The parent closes both pipes after duplicating the output-fd for writing to the
	1679	* compression pipe. */
	1680	output_fd = dup (pipefd[PIPE_WRITE_FD]);
	1681
	1682	if (output_fd < 0 \|\|
	1683	main_file_close (ofile) \|\|
	1684	close (pipefd[PIPE_READ_FD]) \|\|
	1685	close (pipefd[PIPE_WRITE_FD]))
	1686	{
	1687	XPR(NT "close failed: %s\n", xd3_mainerror (ret = get_errno ()));
	1688	goto pipe_cleanup;
	1689	}
	1690
	1691	#if XD3_STDIO
	1692	/* Note: fdopen() acquires the fd, closes it when finished. */
	1693	if ((ofile->file = fdopen (output_fd, "w")) == NULL)
	1694	{
	1695	XPR(NT "fdopen failed: %s\n", xd3_mainerror (ret = get_errno ()));
	1696	goto pipe_cleanup;
	1697	}
	1698
	1699	#elif XD3_POSIX
	1700	ofile->file = output_fd;
	1701	#endif
	1702
	1703	/* Now the output file will be compressed. */
	1704	return 0;
	1705
	1706	pipe_cleanup:
	1707	close (output_fd);
	1708	close (pipefd[PIPE_READ_FD]);
	1709	close (pipefd[PIPE_WRITE_FD]);
	1710	return ret;
	1711	}
	1712	#endif /* EXTERNAL_COMPRESSION */
	1713
	1714	/* Identify the compressor that was used based on its ident string, which is passed in the
	1715	* application header. */
	1716	static const main_extcomp*
	1717	main_ident_compressor (const char *ident)
	1718	{
	1719	int i;
	1720
	1721	for (i = 0; i < SIZEOF_ARRAY (extcomp_types); i += 1)
	1722	{
	1723	if (strcmp (extcomp_types[i].ident, ident) == 0)
	1724	{
	1725	return & extcomp_types[i];
	1726	}
	1727	}
	1728
	1729	return NULL;
	1730	}
	1731
	1732	/* Return the main_extcomp record to use for this identifier, if possible. */
	1733	static const main_extcomp*
	1734	main_get_compressor (const char *ident)
	1735	{
	1736	const main_extcomp *ext = main_ident_compressor (ident);
	1737
	1738	if (ext == NULL)
	1739	{
	1740	if (! option_quiet)
	1741	{
	1742	XPR(NT "warning: cannot recompress output: "
	1743	"unrecognized external compression ID: %s\n", ident);
	1744	}
	1745	return NULL;
	1746	}
	1747	else if (! EXTERNAL_COMPRESSION)
	1748	{
	1749	if (! option_quiet)
	1750	{
	1751	XPR(NT "warning: external support not compiled: "
	1752	"original input was compressed: %s\n", ext->recomp_cmdname);
	1753	}
	1754	return NULL;
	1755	}
	1756	else
	1757	{
	1758	return ext;
	1759	}
	1760	}
	1761
	1762	/******************************************************************************************
	1763	APPLICATION HEADER
	1764	******************************************************************************************/
	1765
	1766	#if XD3_ENCODER
	1767	static const char*
	1768	main_apphead_string (const char* x)
	1769	{
	1770	const char *y;
	1771
	1772	if (x == NULL) { return ""; }
	1773
	1774	if (strcmp (x, "/dev/stdin") == 0 \|\|
	1775	strcmp (x, "/dev/stdout") == 0 \|\|
	1776	strcmp (x, "/dev/stderr") == 0) { return "-"; }
	1777
	1778	// TODO: this is not portable
	1779	return (y = strrchr (x, '/')) == NULL ? x : y + 1;
	1780	}
	1781
	1782	static int
	1783	main_set_appheader (xd3_stream stream, main_file input, main_file *sfile)
	1784	{
	1785	/* The user may disable the application header. Once the appheader is set, this
	1786	* disables setting it again. */
	1787	if (appheader_used \|\| ! option_use_appheader) { return 0; }
	1788
	1789	/* The user may specify the application header, otherwise format the default header. */
	1790	if (option_appheader)
	1791	{
	1792	appheader_used = option_appheader;
	1793	}
	1794	else
	1795	{
	1796	const char *iname;
	1797	const char *icomp;
	1798	const char *sname;
	1799	const char *scomp;
	1800	int len;
	1801
	1802	iname = main_apphead_string (input->filename);
	1803	icomp = (input->compressor == NULL) ? "" : input->compressor->ident;
	1804	len = strlen (iname) + strlen (icomp) + 2;
	1805
	1806	if (sfile->filename != NULL)
	1807	{
	1808	sname = main_apphead_string (sfile->filename);
	1809	scomp = (sfile->compressor == NULL) ? "" : sfile->compressor->ident;
	1810	len += strlen (sname) + strlen (scomp) + 2;
	1811	}
	1812	else
	1813	{
	1814	sname = scomp = "";
	1815	}
	1816
	1817	if ((appheader_used = main_malloc (len)) == NULL)
	1818	{
	1819	return ENOMEM;
	1820	}
	1821
	1822	if (sfile->filename == NULL)
	1823	{
	1824	sprintf ((char*)appheader_used, "%s/%s", iname, icomp);
	1825	}
	1826	else
	1827	{
	1828	sprintf ((char*)appheader_used, "%s/%s/%s/%s", iname, icomp, sname, scomp);
	1829	}
	1830	}
	1831
	1832	xd3_set_appheader (stream, appheader_used, strlen ((char*)appheader_used));
	1833
	1834	return 0;
	1835	}
	1836	#endif
	1837
	1838	static void
	1839	main_get_appheader_params (main_file file, char parsed, int output, const char type,
	1840	main_file *other)
	1841	{
	1842	/* Set the filename if it was not specified. If output, option_stdout (-c) overrides. */
	1843	if (file->filename == NULL && ! (output && option_stdout) && strcmp (parsed[0], "-") != 0)
	1844	{
	1845	file->filename = parsed[0];
	1846
	1847	if (other->filename != NULL) {
	1848	/* Take directory from the other file, if it has one. */
	1849	/* TODO: This results in nonsense names like /dev/foo.tar.gz
	1850	* and probably the filename-default logic interferes with
	1851	* multi-file operation and the standard file extension?
	1852	* Possibly the name header is bad, should be off by default.
	1853	* Possibly we just want to remember external/compression
	1854	* settings. */
	1855	char *last_slash = strrchr(other->filename, '/');
	1856
	1857	if (last_slash != NULL) {
	1858	int dlen = last_slash - other->filename;
	1859
	1860	XD3_ASSERT(file->filename_copy == NULL);
	1861	file->filename_copy = main_malloc(dlen + 2 + strlen(file->filename));
	1862
	1863	strncpy(file->filename_copy, other->filename, dlen);
	1864	file->filename_copy[dlen] = '/';
	1865	strcpy(file->filename_copy + dlen + 1, parsed[0]);
	1866
	1867	file->filename = file->filename_copy;
	1868	}
	1869	}
	1870
	1871	if (! option_quiet)
	1872	{
	1873	XPR(NT "using default %s filename: %s\n", type, file->filename);
	1874	}
	1875	}
	1876
	1877	/* Set the compressor, initiate de/recompression later. */
	1878	if (file->compressor == NULL && *parsed[1] != 0)
	1879	{
	1880	file->compressor = main_get_compressor (parsed[1]);
	1881	}
	1882	}
	1883
	1884	static void
	1885	main_get_appheader (xd3_stream stream, main_file ifile, main_file output, main_file sfile)
	1886	{
	1887	uint8_t *apphead;
	1888	usize_t appheadsz;
	1889	int ret;
	1890
	1891	/* The user may disable the application header. Once the appheader is set, this
	1892	* disables setting it again. */
	1893	if (! option_use_appheader) { return; }
	1894
	1895	ret = xd3_get_appheader (stream, & apphead, & appheadsz);
	1896
	1897	/* Ignore failure, it only means we haven't received a header yet. */
	1898	if (ret != 0) { return; }
	1899
	1900	if (appheadsz > 0)
	1901	{
	1902	char start = (char)apphead;
	1903	char *slash;
	1904	int place = 0;
	1905	char *parsed[4];
	1906
	1907	memset (parsed, 0, sizeof (parsed));
	1908
	1909	while ((slash = strchr (start, '/')) != NULL)
	1910	{
	1911	*slash = 0;
	1912	parsed[place++] = start;
	1913	start = slash + 1;
	1914	}
	1915
	1916	parsed[place++] = start;
	1917
	1918	/* First take the output parameters. */
	1919	if (place == 2 \|\| place == 4)
	1920	{
	1921	main_get_appheader_params (output, parsed, 1, "output", ifile);
	1922	}
	1923
	1924	/* Then take the source parameters. */
	1925	if (place == 4)
	1926	{
	1927	main_get_appheader_params (sfile, parsed+2, 0, "source", ifile);
	1928	}
	1929	}
	1930
	1931	option_use_appheader = 0;
	1932	return;
	1933	}
	1934
	1935	/******************************************************************************************
	1936	Main I/O routines
	1937	******************************************************************************************/
	1938
	1939	/* This function acts like the above except it may also try to recognize a compressed
	1940	* input when the first buffer of data is read. The EXTERNAL_COMPRESSION code is called
	1941	* to search for magic numbers. */
	1942	static int
	1943	main_read_primary_input (main_file *ifile,
	1944	uint8_t *buf,
	1945	usize_t size,
	1946	usize_t *nread)
	1947	{
	1948	#if EXTERNAL_COMPRESSION
	1949	if (option_decompress_inputs && ifile->flags & RD_FIRST)
	1950	{
	1951	ifile->flags &= ~RD_FIRST;
	1952
	1953	return main_decompress_input_check (ifile, buf, size, nread);
	1954	}
	1955	#endif
	1956
	1957	return main_file_read (ifile, buf, size, nread, "input read failed");
	1958	}
	1959
	1960	/* This function simply writes the stream output buffer, if there is any. This is used
	1961	* for both encode and decode commands. (The VCDIFF tools use main_print_func()). */
	1962	static int
	1963	main_write_output (xd3_stream* stream, main_file *ofile)
	1964	{
	1965	int ret;
	1966
	1967	if (stream->avail_out > 0 && (ret = main_file_write (ofile, stream->next_out, stream->avail_out, "write failed")))
	1968	{
	1969	return ret;
	1970	}
	1971
	1972	return 0;
	1973	}
	1974
	1975	/* Open the main output file, sets a default file name, initiate recompression. This
	1976	* function is expected to fprint any error messages. */
	1977	static int
	1978	main_open_output (xd3_stream stream, main_file ofile)
	1979	{
	1980	int ret;
	1981
	1982	if (ofile->filename == NULL)
	1983	{
	1984	XSTDOUT_XF (ofile);
	1985
	1986	if (option_verbose > 1) { XPR(NT "using standard output: %s\n", ofile->filename); }
	1987	}
	1988	else
	1989	{
	1990	/* Stat the file to check for overwrite. */
	1991	if (option_force == 0 && main_file_exists (ofile))
	1992	{
	1993	XPR(NT "to overwrite output file specify -f: %s\n", ofile->filename);
	1994	return EEXIST;
	1995	}
	1996
	1997	if ((ret = main_file_open (ofile, ofile->filename, XO_WRITE)))
	1998	{
	1999	return ret;
	2000	}
	2001
	2002	if (option_verbose > 1) { XPR(NT "output file: %s\n", ofile->filename); }
	2003	}
	2004
	2005	#if EXTERNAL_COMPRESSION
	2006	/* Do output recompression. */
	2007	if (ofile->compressor != NULL && option_recompress_outputs == 1)
	2008	{
	2009	if (! option_quiet)
	2010	{
	2011	XPR(NT "%s %s \| %s\n",
	2012	ofile->compressor->recomp_cmdname,
	2013	ofile->compressor->recomp_options,
	2014	ofile->filename);
	2015	}
	2016
	2017	if ((ret = main_recompress_output (ofile)))
	2018	{
	2019	return ret;
	2020	}
	2021	}
	2022	#endif
	2023
	2024	return 0;
	2025	}
	2026
	2027	/* This is called at different times for encoding and decoding. The encoder calls it
	2028	* immediately, the decoder delays until the application header is received.
	2029	* Stream may be NULL, in which case xd3_set_source is not called. */
	2030	static int
	2031	main_set_source (xd3_stream stream, int cmd, main_file sfile, xd3_source *source)
	2032	{
	2033	int ret = 0, i;
	2034	uint8_t *tmp_buf = NULL;
	2035
	2036	/* Open it, check for seekability, set required xd3_source fields. */
	2037	if (allow_fake_source)
	2038	{
	2039	sfile->mode = XO_READ;
	2040	sfile->realname = sfile->filename;
	2041	sfile->nread = 0;
	2042	source->size = UINT64_MAX;
	2043	}
	2044	else
	2045	{
	2046	if ((ret = main_file_open (sfile, sfile->filename, XO_READ)) \|\|
	2047	(ret = main_file_stat (sfile, & source->size, 1)))
	2048	{
	2049	goto error;
	2050	}
	2051	}
	2052
	2053	source->name = sfile->filename;
	2054	source->ioh = sfile;
	2055	source->curblkno = (xoff_t) -1;
	2056	source->curblk = NULL;
	2057
	2058	#if EXTERNAL_COMPRESSION
	2059	if (option_decompress_inputs)
	2060	{
	2061	/* If encoding, read the header to check for decompression. */
	2062	if (IS_ENCODE (cmd))
	2063	{
	2064	usize_t nread;
	2065	tmp_buf = main_malloc(XD3_ALLOCSIZE);
	2066
	2067	if ((ret = main_file_read (sfile, tmp_buf, XD3_ALLOCSIZE,
	2068	& nread, "source read failed")))
	2069	{
	2070	goto error;
	2071	}
	2072
	2073	/* Check known magic numbers. */
	2074	for (i = 0; i < SIZEOF_ARRAY (extcomp_types); i += 1)
	2075	{
	2076	const main_extcomp *decomp = & extcomp_types[i];
	2077
	2078	if ((nread > decomp->magic_size) &&
	2079	memcmp (tmp_buf, decomp->magic, decomp->magic_size) == 0)
	2080	{
	2081	sfile->compressor = decomp;
	2082	break;
	2083	}
	2084	}
	2085
	2086	if (sfile->compressor == NULL)
	2087	{
	2088	if (option_verbose > 2)
	2089	{
	2090	XPR(NT "source block 0 read (not compressed)\n");
	2091	}
	2092	}
	2093	}
	2094
	2095	/* In either the encoder or decoder, start decompression. */
	2096	if (sfile->compressor)
	2097	{
	2098	xoff_t osize = source->size;
	2099
	2100	if (osize > XD3_NODECOMPRESSSIZE)
	2101	{
	2102	XPR(NT "source file too large for external decompression: %s: %"Q"u\n",
	2103	sfile->filename, osize);
	2104	ret = XD3_INTERNAL;
	2105	goto error;
	2106	}
	2107
	2108	if ((ret = main_decompress_source (sfile, source)))
	2109	{
	2110	goto error;
	2111	}
	2112
	2113	if (! option_quiet)
	2114	{
	2115	char s1[32], s2[32];
	2116	XPR(NT "%s \| %s %s => %s %.1f%% [ %s , %s ]\n",
	2117	sfile->filename,
	2118	sfile->compressor->decomp_cmdname,
	2119	sfile->compressor->decomp_options,
	2120	sfile->realname,
	2121	100.0 * source->size / osize,
	2122	main_format_bcnt (osize, s1),
	2123	main_format_bcnt (source->size, s2));
	2124	}
	2125	}
	2126	}
	2127	#endif
	2128
	2129	/* At this point we know source->size.
	2130	* Source buffer, blksize, LRU init. */
	2131	if (source->size < option_srcwinsz)
	2132	{
	2133	/* Reduce sizes to actual source size, read whole file */
	2134	option_srcwinsz = source->size;
	2135	source->blksize = source->size;
	2136	lru_size = 1;
	2137	}
	2138	else
	2139	{
	2140	option_srcwinsz = max(option_srcwinsz, XD3_MINSRCWINSZ);
	2141
	2142	source->blksize = (option_srcwinsz / LRU_SIZE);
	2143	lru_size = LRU_SIZE;
	2144	}
	2145
	2146	main_blklru_list_init (& lru_list);
	2147	main_blklru_list_init (& lru_free);
	2148
	2149	if (option_verbose)
	2150	{
	2151	static char buf[32];
	2152
	2153	XPR(NT "source %s winsize %s size %"Q"u\n",
	2154	sfile->filename, main_format_bcnt(option_srcwinsz, buf), source->size);
	2155	}
	2156
	2157	if (option_verbose > 1)
	2158	{
	2159	XPR(NT "source block size: %u\n", source->blksize);
	2160	}
	2161
	2162	if ((lru = main_malloc (sizeof (main_blklru) * lru_size)) == NULL)
	2163	{
	2164	ret = ENOMEM;
	2165	goto error;
	2166	}
	2167
	2168	for (i = 0; i < lru_size; i += 1)
	2169	{
	2170	lru[i].blkno = (xoff_t) -1;
	2171
	2172	if ((lru[i].blk = main_malloc (source->blksize)) == NULL)
	2173	{
	2174	ret = ENOMEM;
	2175	goto error;
	2176	}
	2177
	2178	main_blklru_list_push_back (& lru_free, & lru[i]);
	2179	}
	2180
	2181	if (stream && (ret = xd3_set_source (stream, source)))
	2182	{
	2183	XPR(NT XD3_LIB_ERRMSG (stream, ret));
	2184	goto error;
	2185	}
	2186
	2187	error:
	2188	if (tmp_buf != NULL)
	2189	{
	2190	main_free (tmp_buf);
	2191	}
	2192
	2193	return ret;
	2194	}
	2195
	2196	static void
	2197	main_set_winsize (main_file *ifile) {
	2198	xoff_t file_size;
	2199
	2200	if (main_file_stat (ifile, &file_size, 0) == 0)
	2201	{
	2202	option_winsize = (usize_t) min(file_size, (xoff_t) option_winsize);
	2203	}
	2204
	2205	option_winsize = max(option_winsize, XD3_ALLOCSIZE);
	2206
	2207	if (option_verbose > 1)
	2208	{
	2209	XPR(NT "input window size: %u\n", option_winsize);
	2210	}
	2211	}
	2212
	2213	/******************************************************************************************
	2214	Source routines
	2215	******************************************************************************************/
	2216
	2217	/* This is the callback for reading a block of source. This function is blocking and it
	2218	* implements a small LRU.
	2219	*
	2220	* Note that it is possible for main_input() to handle getblk requests in a non-blocking
	2221	* manner. If the callback is NULL then the caller of xd3_*_input() must handle the
	2222	* XD3_GETSRCBLK return value and fill the source in the same way. See xd3_getblk for
	2223	* details. To see an example of non-blocking getblk, see xdelta-test.h. */
	2224	static int
	2225	main_getblk_func (xd3_stream *stream,
	2226	xd3_source *source,
	2227	xoff_t blkno)
	2228	{
	2229	xoff_t pos = blkno * source->blksize;
	2230	main_file sfile = (main_file) source->ioh;
	2231	main_blklru *blru = NULL;
	2232	usize_t onblk = xd3_bytes_on_srcblk (source, blkno);
	2233	usize_t nread;
	2234	int ret;
	2235	int i;
	2236
	2237	if (allow_fake_source)
	2238	{
	2239	source->curblkno = blkno;
	2240	source->onblk = onblk;
	2241	source->curblk = lru[0].blk;
	2242	return 0;
	2243	}
	2244
	2245	if (do_not_lru)
	2246	{
	2247	/* Direct lookup assumes sequential scan w/o skipping blocks. */
	2248	int idx = blkno % lru_size;
	2249	if (lru[idx].blkno == blkno)
	2250	{
	2251	source->curblkno = blkno;
	2252	source->onblk = onblk;
	2253	source->curblk = lru[idx].blk;
	2254	lru_hits += 1;
	2255	return 0;
	2256	}
	2257
	2258	if (lru[idx].blkno != -1LL &&
	2259	lru[idx].blkno != blkno - lru_size)
	2260	{
	2261	return XD3_TOOFARBACK;
	2262	}
	2263	}
	2264	else
	2265	{
	2266	/* Sequential search through LRU. */
	2267	for (i = 0; i < lru_size; i += 1)
	2268	{
	2269	if (lru[i].blkno == blkno)
	2270	{
	2271	main_blklru_list_remove (& lru[i]);
	2272	main_blklru_list_push_back (& lru_list, & lru[i]);
	2273
	2274	source->curblkno = blkno;
	2275	source->onblk = onblk;
	2276	source->curblk = lru[i].blk;
	2277	lru_hits += 1;
	2278	return 0;
	2279	}
	2280	}
	2281	}
	2282
	2283	if (! main_blklru_list_empty (& lru_free))
	2284	{
	2285	blru = main_blklru_list_pop_front (& lru_free);
	2286	}
	2287	else if (! main_blklru_list_empty (& lru_list))
	2288	{
	2289	if (do_not_lru) {
	2290	blru = & lru[blkno % lru_size];
	2291	main_blklru_list_remove(blru);
	2292	} else {
	2293	blru = main_blklru_list_pop_front (& lru_list);
	2294	}
	2295	lru_misses += 1;
	2296	}
	2297
	2298	lru_filled += 1;
	2299
	2300	if ((ret = main_file_seek (sfile, pos)))
	2301	{
	2302	return ret;
	2303	}
	2304
	2305	if ((ret = main_file_read (sfile, (uint8_t*) blru->blk, source->blksize,
	2306	& nread, "source read failed")))
	2307	{
	2308	return ret;
	2309	}
	2310
	2311	if (nread != onblk)
	2312	{
	2313	XPR(NT "source file size change: %s\n", sfile->filename);
	2314	return XD3_INTERNAL;
	2315	}
	2316
	2317	main_blklru_list_push_back (& lru_list, blru);
	2318
	2319	if (option_verbose > 3)
	2320	{
	2321	if (blru->blkno != -1LL)
	2322	{
	2323	XPR(NT "source block %"Q"u ejects %"Q"u (lru_hits=%u, lru_misses=%u, lru_filled=%u)\n",
	2324	blkno, blru->blkno, lru_hits, lru_misses, lru_filled);
	2325	}
	2326	else
	2327	{
	2328	XPR(NT "source block %"Q"u read (lru_hits=%u, lru_misses=%u, lru_filled=%u)\n",
	2329	blkno, lru_hits, lru_misses, lru_filled);
	2330	}
	2331	}
	2332
	2333	blru->blkno = blkno;
	2334	source->curblk = blru->blk;
	2335	source->curblkno = blkno;
	2336	source->onblk = onblk;
	2337
	2338	return 0;
	2339	}
	2340
	2341	/******************************************************************************************
	2342	Main routines
	2343	******************************************************************************************/
	2344
	2345	/* This is a generic input function. It calls the xd3_encode_input or xd3_decode_input
	2346	* functions and makes calls to the various input handling routines above, which
	2347	* coordinate external decompression.
	2348	*/
	2349	static int
	2350	main_input (xd3_cmd cmd,
	2351	main_file *ifile,
	2352	main_file *ofile,
	2353	main_file *sfile)
	2354	{
	2355	int ret;
	2356	xd3_stream stream;
	2357	usize_t nread;
	2358	int stream_flags = 0;
	2359	xd3_config config;
	2360	xd3_source source;
	2361	xoff_t last_total_in = 0;
	2362	xoff_t last_total_out = 0;
	2363	long start_time;
	2364	int stdout_only = 0;
	2365
	2366	int (input_func) (xd3_stream);
	2367	int (output_func) (xd3_stream, main_file *);
	2368
	2369	memset (& source, 0, sizeof (source));
	2370	memset (& config, 0, sizeof (config));
	2371
	2372	config.alloc = main_alloc;
	2373	config.freef = main_free1;
	2374	config.sec_data.ngroups = 1;
	2375	config.sec_addr.ngroups = 1;
	2376	config.sec_inst.ngroups = 1;
	2377	config.iopt_size = option_iopt_size;
	2378	config.sprevsz = option_sprevsz;
	2379
	2380	do_not_lru = 0;
	2381
	2382	start_time = get_millisecs_now ();
	2383
	2384	/* main_input setup. */
	2385	switch ((int) cmd)
	2386	{
	2387	#if VCDIFF_TOOLS
	2388	if (1) { case CMD_PRINTHDR: stream_flags = XD3_JUST_HDR; }
	2389	else if (1) { case CMD_PRINTHDRS: stream_flags = XD3_SKIP_WINDOW; }
	2390	else { case CMD_PRINTDELTA: stream_flags = XD3_SKIP_EMIT; }
	2391	ifile->flags \|= RD_NONEXTERNAL;
	2392	input_func = xd3_decode_input;
	2393	output_func = main_print_func;
	2394	stream_flags \|= XD3_ADLER32_NOVER;
	2395	stdout_only = 1;
	2396	break;
	2397	#endif
	2398	#if XD3_ENCODER
	2399	case CMD_ENCODE:
	2400	do_not_lru = 1;
	2401	input_func = xd3_encode_input;
	2402	output_func = main_write_output;
	2403
	2404	if (option_use_checksum) { stream_flags \|= XD3_ADLER32; }
	2405	if (option_use_secondary)
	2406	{
	2407	/* The default secondary compressor is DJW, if it's compiled, being used, etc. */
	2408	if (option_secondary == NULL)
	2409	{
	2410	if (SECONDARY_DJW) { stream_flags \|= XD3_SEC_DJW; }
	2411	}
	2412	else
	2413	{
	2414	if (strcmp (option_secondary, "fgk") == 0 && SECONDARY_FGK)
	2415	{
	2416	stream_flags \|= XD3_SEC_FGK;
	2417	}
	2418	else if (strcmp (option_secondary, "djw") == 0 && SECONDARY_DJW)
	2419	{
	2420	stream_flags \|= XD3_SEC_DJW;
	2421	}
	2422	else
	2423	{
	2424	XPR(NT "unrecognized secondary compressor type: %s\n", option_secondary);
	2425	return EXIT_FAILURE;
	2426	}
	2427	}
	2428	}
	2429	if (option_no_compress) { stream_flags \|= XD3_NOCOMPRESS; }
	2430	if (option_use_altcodetable) { stream_flags \|= XD3_ALT_CODE_TABLE; }
	2431	if (option_smatch_config)
	2432	{
	2433	char s = option_smatch_config, e;
	2434	int values[XD3_SOFTCFG_VARCNT];
	2435	int got;
	2436
	2437	config.smatch_cfg = XD3_SMATCH_SOFT;
	2438
	2439	for (got = 0; got < XD3_SOFTCFG_VARCNT; got += 1, s = e + 1)
	2440	{
	2441	values[got] = strtol (s, &e, 10);
	2442
	2443	if ((values[got] < 0) \|\|
	2444	(e == s) \|\|
	2445	(got < XD3_SOFTCFG_VARCNT-1 && *e == 0) \|\|
	2446	(got == XD3_SOFTCFG_VARCNT-1 && *e != 0))
	2447	{
	2448	XPR(NT "invalid string match specifier (-C) %d: %s\n",
	2449	got, s);
	2450	return EXIT_FAILURE;
	2451	}
	2452	}
	2453
	2454	config.smatcher_soft.large_look = values[0];
	2455	config.smatcher_soft.large_step = values[1];
	2456	config.smatcher_soft.small_look = values[2];
	2457	config.smatcher_soft.small_chain = values[3];
	2458	config.smatcher_soft.small_lchain = values[4];
	2459	config.smatcher_soft.max_lazy = values[5];
	2460	config.smatcher_soft.long_enough = values[6];
	2461	}
	2462	else
	2463	{
	2464	if (option_verbose > 1)
	2465	{
	2466	XPR(NT "compression level: %d\n", option_level);
	2467	}
	2468	if (option_level == 0)
	2469	{
	2470	stream_flags \|= XD3_NOCOMPRESS;
	2471	config.smatch_cfg = XD3_SMATCH_FASTEST;
	2472	}
	2473	else if (option_level == 1) { config.smatch_cfg = XD3_SMATCH_FASTEST; }
	2474	else if (option_level <= 5) { config.smatch_cfg = XD3_SMATCH_FAST; }
	2475	else if (option_level == 6) { config.smatch_cfg = XD3_SMATCH_DEFAULT; }
	2476	else { config.smatch_cfg = XD3_SMATCH_SLOW; }
	2477	}
	2478	break;
	2479	#endif
	2480	case CMD_DECODE:
	2481	if (option_use_checksum == 0) { stream_flags \|= XD3_ADLER32_NOVER; }
	2482	stream_flags = 0;
	2483	ifile->flags \|= RD_NONEXTERNAL;
	2484	input_func = xd3_decode_input;
	2485	output_func = main_write_output;
	2486	break;
	2487	default:
	2488	XPR(NT "internal error\n");
	2489	return EXIT_FAILURE;
	2490	}
	2491
	2492	main_set_winsize (ifile);
	2493
	2494	if ((main_bdata = main_malloc (option_winsize)) == NULL)
	2495	{
	2496	return EXIT_FAILURE;
	2497	}
	2498
	2499	if (IS_ENCODE (cmd))
	2500	{
	2501	/* When encoding, open the source file, possibly decompress it. The decoder delays
	2502	* this step until XD3_GOTHEADER. */
	2503	if (sfile->filename != NULL && (ret = main_set_source (NULL, cmd, sfile, & source)))
	2504	{
	2505	return EXIT_FAILURE;
	2506	}
	2507	}
	2508
	2509	config.winsize = option_winsize;
	2510	config.srcwin_maxsz = option_srcwinsz;
	2511	config.getblk = main_getblk_func;
	2512	config.flags = stream_flags;
	2513
	2514	if ((ret = xd3_config_stream (& stream, & config)))
	2515	{
	2516	XPR(NT XD3_LIB_ERRMSG (& stream, ret));
	2517	return EXIT_FAILURE;
	2518	}
	2519
	2520	if (IS_ENCODE (cmd) && sfile->filename != NULL &&
	2521	(ret = xd3_set_source (& stream, & source)))
	2522	{
	2523	XPR(NT XD3_LIB_ERRMSG (& stream, ret));
	2524	return EXIT_FAILURE;
	2525	}
	2526
	2527	/* This times each window. */
	2528	get_millisecs_since ();
	2529
	2530	/* Main input loop. */
	2531	do
	2532	{
	2533	xoff_t input_offset;
	2534	xoff_t input_remain;
	2535	usize_t try_read;
	2536
	2537	input_offset = ifile->nread;
	2538
	2539	input_remain = XOFF_T_MAX - input_offset;
	2540
	2541	try_read = (usize_t) min ((xoff_t) config.winsize, input_remain);
	2542
	2543	if ((ret = main_read_primary_input (ifile, main_bdata, try_read, & nread)))
	2544	{
	2545	return EXIT_FAILURE;
	2546	}
	2547
	2548	/* If we've reached EOF tell the stream to flush. */
	2549	if (nread < try_read)
	2550	{
	2551	stream_flags \|= XD3_FLUSH;
	2552	xd3_set_flags (& stream, stream_flags);
	2553	}
	2554
	2555	#if XD3_ENCODER
	2556	/* After the first main_read_primary_input completes, we know all the information
	2557	* needed to encode the application header. */
	2558	if (cmd == CMD_ENCODE && (ret = main_set_appheader (& stream, ifile, sfile)))
	2559	{
	2560	return EXIT_FAILURE;
	2561	}
	2562	#endif
	2563	xd3_avail_input (& stream, main_bdata, nread);
	2564
	2565	/* If we read zero bytes after encoding at least one window... */
	2566	if (nread == 0 && stream.current_window > 0) {
	2567	break;
	2568	}
	2569
	2570	again:
	2571	ret = input_func (& stream);
	2572
	2573	switch (ret)
	2574	{
	2575	case XD3_INPUT:
	2576	continue;
	2577
	2578	case XD3_GOTHEADER:
	2579	{
	2580	XD3_ASSERT (stream.current_window == 0);
	2581
	2582	/* Need to process the appheader as soon as possible. It may contain a
	2583	* suggested default filename/decompression routine for the ofile, and it may
	2584	* contain default/decompression routine for the sources. */
	2585	if (cmd == CMD_DECODE)
	2586	{
	2587	int have_src = sfile->filename != NULL;
	2588	int need_src = xd3_decoder_needs_source (& stream);
	2589	int recv_src;
	2590
	2591	/* May need to set the sfile->filename if none was given. */
	2592	main_get_appheader (& stream, ifile, ofile, sfile);
	2593
	2594	recv_src = sfile->filename != NULL;
	2595
	2596	/* Check if the user expected a source to be required although it was not. */
	2597	if (have_src && ! need_src && ! option_quiet)
	2598	{
	2599	XPR(NT "warning: output window %"Q"u does not copy source\n", stream.current_window);
	2600	}
	2601
	2602	/* Check if we have no source name and need one. */
	2603	/* TODO: this doesn't fire due to cpyblocks_ calculation check? */
	2604	if (need_src && ! recv_src)
	2605	{
	2606	XPR(NT "input requires a source file, use -s\n");
	2607	return EXIT_FAILURE;
	2608	}
	2609
	2610	/* Now open the source file. */
	2611	if (need_src && (ret = main_set_source (& stream, cmd, sfile, & source)))
	2612	{
	2613	return EXIT_FAILURE;
	2614	}
	2615	}
	2616	else if (cmd == CMD_PRINTHDR \|\|
	2617	cmd == CMD_PRINTHDRS \|\|
	2618	cmd == CMD_PRINTDELTA)
	2619	{
	2620	if (xd3_decoder_needs_source (& stream) && sfile->filename == NULL)
	2621	{
	2622	allow_fake_source = 1;
	2623	sfile->filename = "<placeholder>";
	2624	main_set_source (& stream, cmd, sfile, & source);
	2625	}
	2626	}
	2627	}
	2628	/* FALLTHROUGH */
	2629	case XD3_WINSTART:
	2630	{
	2631	/* e.g., set or unset XD3_SKIP_WINDOW. */
	2632	/* xd3_set_flags (& stream, stream_flags); */
	2633	goto again;
	2634	}
	2635
	2636	case XD3_OUTPUT:
	2637	{
	2638	if (option_no_output == 0)
	2639	{
	2640	/* Defer opening the output file until the stream produces its first
	2641	* output for both encoder and decoder, this way we delay long enough for
	2642	* the decoder to receive the application header. (Or longer if there are
	2643	* skipped windows, but I can't think of any reason not to delay open.) */
	2644
	2645	if (! main_file_isopen (ofile) && (ret = main_open_output (& stream, ofile)) != 0)
	2646	{
	2647	return EXIT_FAILURE;
	2648	}
	2649	if ((ret = output_func (& stream, ofile)) && (ret != PRINTHDR_SPECIAL))
	2650	{
	2651	return EXIT_FAILURE;
	2652	}
	2653	if (ret == PRINTHDR_SPECIAL)
	2654	{
	2655	xd3_abort_stream (& stream);
	2656	ret = EXIT_SUCCESS;
	2657	goto done;
	2658	}
	2659	ret = 0;
	2660	}
	2661
	2662	xd3_consume_output (& stream);
	2663	goto again;
	2664	}
	2665
	2666	case XD3_WINFINISH:
	2667	{
	2668	if (IS_ENCODE (cmd) \|\| cmd == CMD_DECODE)
	2669	{
	2670	if (! option_quiet && IS_ENCODE (cmd) && main_file_isopen (sfile))
	2671	{
	2672	/* Warn when no source copies are found */
	2673	if (! xd3_encoder_used_source (& stream))
	2674	{
	2675	XPR(NT "warning: input window %"Q"u..%"Q"u has no source copies\n",
	2676	stream.current_window * option_winsize,
	2677	(stream.current_window+1) * option_winsize);
	2678	}
	2679
	2680	/* Limited instruction buffer size affects source copies */
	2681	if (option_verbose > 1 && stream.i_slots_used > stream.iopt_size)
	2682	{
	2683	XPR(NT "warning: input position %"Q"u overflowed instruction buffer, "
	2684	"needed %u (vs. %u), consider raising -I\n",
	2685	stream.current_window * option_winsize,
	2686	stream.i_slots_used, stream.iopt_size);
	2687	}
	2688	}
	2689
	2690	if (option_verbose)
	2691	{
	2692	char rrateavg[32], wrateavg[32], tm[32];
	2693	char rdb[32], wdb[32];
	2694	char trdb[32], twdb[32];
	2695	long millis = get_millisecs_since ();
	2696	usize_t this_read = (usize_t)(stream.total_in - last_total_in);
	2697	usize_t this_write = (usize_t)(stream.total_out - last_total_out);
	2698	last_total_in = stream.total_in;
	2699	last_total_out = stream.total_out;
	2700
	2701	if (option_verbose > 1)
	2702	{
	2703	XPR(NT "%"Q"u: in %s (%s): out %s (%s): total in %s: out %s: %s\n",
	2704	stream.current_window,
	2705	main_format_bcnt (this_read, rdb),
	2706	main_format_rate (this_read, millis, rrateavg),
	2707	main_format_bcnt (this_write, wdb),
	2708	main_format_rate (this_write, millis, wrateavg),
	2709	main_format_bcnt (stream.total_in, trdb),
	2710	main_format_bcnt (stream.total_out, twdb),
	2711	main_format_millis (millis, tm));
	2712	}
	2713	else
	2714	{
	2715	XPR(NT "%"Q"u: in %s: out %s: total in %s: out %s: %s\n",
	2716	stream.current_window,
	2717	main_format_bcnt (this_read, rdb),
	2718	main_format_bcnt (this_write, wdb),
	2719	main_format_bcnt (stream.total_in, trdb),
	2720	main_format_bcnt (stream.total_out, twdb),
	2721	main_format_millis (millis, tm));
	2722	}
	2723	}
	2724	}
	2725	goto again;
	2726	}
	2727
	2728	default:
	2729	/* input_func() error */
	2730	XPR(NT XD3_LIB_ERRMSG (& stream, ret));
	2731	return EXIT_FAILURE;
	2732	}
	2733	}
	2734	while (nread == config.winsize);
	2735	done:
	2736	/* Close the inputs. (ifile must be open, sfile may be open) */
	2737	main_file_close (ifile);
	2738	main_file_close (sfile);
	2739
	2740	/* If output file is not open yet because of delayed-open, it means we never encountered
	2741	* a window in the delta, but it could have had a VCDIFF header? TODO: solve this
	2742	* elsewhere. For now, it prints "nothing to output" below, but the check doesn't
	2743	* happen in case of option_no_output. */
	2744	if (! option_no_output)
	2745	{
	2746	if (!stdout_only && ! main_file_isopen (ofile))
	2747	{
	2748	XPR(NT "nothing to output: %s\n", ifile->filename);
	2749	return EXIT_FAILURE;
	2750	}
	2751
	2752	/* Have to close the output before calling main_external_compression_finish, or else it hangs. */
	2753	if (main_file_close (ofile) != 0)
	2754	{
	2755	return EXIT_FAILURE;
	2756	}
	2757	}
	2758
	2759	#if EXTERNAL_COMPRESSION
	2760	if ((ret = main_external_compression_finish ()))
	2761	{
	2762	XPR(NT "external compression commands failed\n");
	2763	return EXIT_FAILURE;
	2764	}
	2765	#endif
	2766
	2767	if ((ret = xd3_close_stream (& stream)))
	2768	{
	2769	XPR(NT XD3_LIB_ERRMSG (& stream, ret));
	2770	return EXIT_FAILURE;
	2771	}
	2772
	2773	if (option_verbose > 1)
	2774	{
	2775	XPR(NT "scanner configuration: %s\n", stream.smatcher.name);
	2776	XPR(NT "target hash table size: %u\n", stream.small_hash.size);
	2777	if (sfile->filename != NULL)
	2778	{
	2779	XPR(NT "source hash table size: %u\n", stream.large_hash.size);
	2780	}
	2781	}
	2782
	2783	if (option_verbose > 2)
	2784	{
	2785	XPR(NT "source copies: %"Q"u (%"Q"u bytes)\n", stream.n_scpy, stream.l_scpy);
	2786	XPR(NT "target copies: %"Q"u (%"Q"u bytes)\n", stream.n_tcpy, stream.l_tcpy);
	2787	XPR(NT "adds: %"Q"u (%"Q"u bytes)\n", stream.n_add, stream.l_add);
	2788	XPR(NT "runs: %"Q"u (%"Q"u bytes)\n", stream.n_run, stream.l_run);
	2789	}
	2790
	2791	xd3_free_stream (& stream);
	2792
	2793	if (option_verbose)
	2794	{
	2795	char tm[32];
	2796	long end_time = get_millisecs_now ();
	2797	XPR(NT "finished in %s; input %"Q"u output %"Q"u bytes (%0.2f%%)\n",
	2798	main_format_millis (end_time - start_time, tm),
	2799	ifile->nread, ofile->nwrite,
	2800	100.0 * ofile->nwrite / ifile->nread);
	2801	}
	2802
	2803	return EXIT_SUCCESS;
	2804	}
	2805
	2806	/* free memory before exit, reset single-use variables. */
	2807	static void
	2808	main_cleanup (void)
	2809	{
	2810	int i;
	2811
	2812	if (appheader_used != NULL &&
	2813	appheader_used != option_appheader)
	2814	{
	2815	main_free (appheader_used);
	2816	appheader_used = NULL;
	2817	}
	2818
	2819	main_free (main_bdata);
	2820	main_bdata = NULL;
	2821
	2822	#if EXTERNAL_COMPRESSION
	2823	main_free (ext_tmpfile);
	2824	ext_tmpfile = NULL;
	2825	#endif
	2826
	2827	for (i = 0; lru && i < lru_size; i += 1)
	2828	{
	2829	main_free (lru[i].blk);
	2830	}
	2831
	2832	main_free (lru);
	2833	lru = NULL;
	2834
	2835	lru_hits = 0;
	2836	lru_misses = 0;
	2837	lru_filled = 0;
	2838
	2839	XD3_ASSERT (main_mallocs == 0);
	2840	}
	2841
	2842	static void
	2843	setup_environment (int argc,
	2844	char **argv,
	2845	int *argc_out,
	2846	char ***argv_out,
	2847	char ***argv_free,
	2848	char **env_free)
	2849	{
	2850	int n, i, i0;
	2851	char p, v = getenv("XDELTA");
	2852	if (v == NULL) {
	2853	(*argc_out) = argc;
	2854	(*argv_out) = argv;
	2855	(*argv_free) = NULL;
	2856	(*env_free) = NULL;
	2857	return;
	2858	}
	2859
	2860	(*env_free) = main_malloc(strlen(v) + 1);
	2861	strcpy(*env_free, v);
	2862
	2863	/* Space needed for extra args, at least # of spaces */
	2864	n = argc + 1;
	2865	for (p = env_free; p != 0; ) {
	2866	if (*p++ == ' ') {
	2867	n++;
	2868	}
	2869	}
	2870
	2871	(argv_free) = main_malloc(sizeof(char) * (n + 1));
	2872	(argv_out) = (argv_free);
	2873	(*argv_out)[0] = argv[0];
	2874	(*argv_out)[n] = NULL;
	2875
	2876	i = 1;
	2877	for (p = env_free; p != 0; ) {
	2878	(*argv_out)[i++] = p;
	2879	while (p != ' ' && p != 0) {
	2880	p++;
	2881	}
	2882	while (*p == ' ') {
	2883	*p++ = 0;
	2884	}
	2885	}
	2886
	2887	for (i0 = 1; i0 < argc; i0++) {
	2888	(*argv_out)[i++] = argv[i0];
	2889	}
	2890
	2891	/* Counting spaces is an upper bound, argv stays NULL terminated. */
	2892	(*argc_out) = i;
	2893	while (i <= n) {
	2894	(*argv_out)[i++] = NULL;
	2895	}
	2896	}
	2897
	2898	int
	2899	#if PYTHON_MODULE \|\| SWIG_MODULE
	2900	xd3_main_cmdline (int argc, char **argv)
	2901	#else
	2902	main (int argc, char **argv)
	2903	#endif
	2904	{
	2905	xd3_cmd cmd;
	2906	main_file ifile;
	2907	main_file ofile;
	2908	main_file sfile;
	2909	static const char *flags = "0123456789cdefhnqvDJNORTVs:B:C:E:F:I:L:O:M:P:W:A::S::";
	2910	int my_optind;
	2911	char *my_optarg;
	2912	char *my_optstr;
	2913	char *sfilename;
	2914	int env_argc;
	2915	char **env_argv;
	2916	char *free_argv; / malloc() in setup_environment() */
	2917	char free_value; / malloc() in setup_environment() */
	2918	int ret;
	2919
	2920	#ifdef _WIN32
	2921	GetStartupInfo(&winStartupInfo);
	2922	setvbuf(stderr, NULL, _IONBF, 0); /* Do not buffer stderr */
	2923	#endif
	2924
	2925	main_file_init (& ifile);
	2926	main_file_init (& ofile);
	2927	main_file_init (& sfile);
	2928
	2929	reset_defaults();
	2930
	2931	free_argv = NULL;
	2932	free_value = NULL;
	2933	setup_environment(argc, argv, &env_argc, &env_argv, &free_argv, &free_value);
	2934	cmd = CMD_NONE;
	2935	sfilename = NULL;
	2936	my_optind = 1;
	2937	argv = env_argv;
	2938	argc = env_argc;
	2939	program_name = env_argv[0];
	2940	extcomp_types[0].recomp_cmdname = program_name;
	2941	extcomp_types[0].decomp_cmdname = program_name;
	2942	takearg:
	2943	my_optarg = NULL;
	2944	my_optstr = argv[my_optind];
	2945	/* This doesn't use getopt() because it makes trouble for -P & python which reenter
	2946	* main() and thus care about freeing all memory. I never had much trust for getopt
	2947	* anyway, it's too opaque. This implements a fairly standard non-long-option getopt
	2948	* with support for named operations (e.g., "xdelta3 [encode\|decode\|printhdr...] < in >
	2949	* out"). */
	2950	if (my_optstr)
	2951	{
	2952	if (*my_optstr == '-') { my_optstr += 1; }
	2953	else if (cmd == CMD_NONE) { goto nonflag; }
	2954	else { my_optstr = NULL; }
	2955	}
	2956	while (my_optstr)
	2957	{
	2958	char *s;
	2959	my_optarg = NULL;
	2960	if ((ret = *my_optstr++) == 0) { my_optind += 1; goto takearg; }
	2961
	2962	/* Option handling: first check for one ':' following the option in flags, then
	2963	* check for two. The syntax allows:
	2964	*
	2965	* 1. -Afoo defines optarg="foo"
	2966	* 2. -A foo defines optarg="foo"
	2967	* 3. -A "" defines optarg="" (allows optional empty-string)
	2968	* 4. -A [EOA or -moreargs] error (mandatory case)
	2969	* 5. -A [EOA -moreargs] defines optarg=NULL (optional case)
	2970	* 6. -A=foo defines optarg="foo"
	2971	* 7. -A= defines optarg="" (mandatory case)
	2972	* 8. -A= defines optarg=NULL (optional case)
	2973	*
	2974	* See tests in test_command_line_arguments().
	2975	*/
	2976	s = strchr (flags, ret);
	2977	if (s && s[1] && s[1] == ':')
	2978	{
	2979	int eqcase = 0;
	2980	int option = s[2] && s[2] == ':';
	2981
	2982	/* Case 1, set optarg to the remaining characters. */
	2983	my_optarg = my_optstr;
	2984	my_optstr = "";
	2985
	2986	/* Case 2-5 */
	2987	if (*my_optarg == 0)
	2988	{
	2989	/* Condition 4-5 */
	2990	int have_arg = my_optind < (argc - 1) && *argv[my_optind+1] != '-';
	2991
	2992	if (! have_arg)
	2993	{
	2994	if (! option)
	2995	{
	2996	/* Case 4 */
	2997	XPR(NT "-%c: requires an argument\n", ret);
	2998	ret = EXIT_FAILURE;
	2999	goto cleanup;
	3000	}
	3001	/* Case 5. */
	3002	my_optarg = NULL;
	3003	}
	3004	else
	3005	{
	3006	/* Case 2-3. */
	3007	my_optarg = argv[++my_optind];
	3008	}
	3009	}
	3010	/* Case 6-8. */
	3011	else if (*my_optarg == '=')
	3012	{
	3013	/* Remove the = in all cases. */
	3014	my_optarg += 1;
	3015	eqcase = 1;
	3016
	3017	if (option && *my_optarg == 0)
	3018	{
	3019	/* Case 8. */
	3020	my_optarg = NULL;
	3021	}
	3022	}
	3023	}
	3024
	3025	switch (ret)
	3026	{
	3027	/* case: if no '-' was found, maybe check for a command name. */
	3028	nonflag:
	3029	if (strcmp (my_optstr, "decode") == 0) { cmd = CMD_DECODE; }
	3030	else if (strcmp (my_optstr, "encode") == 0)
	3031	{
	3032	#if XD3_ENCODER
	3033	cmd = CMD_ENCODE;
	3034	#else
	3035	XPR(NT "encoder support not compiled\n");
	3036	return EXIT_FAILURE;
	3037	#endif
	3038	}
	3039	else if (strcmp (my_optstr, "config") == 0) { cmd = CMD_CONFIG; }
	3040	#if REGRESSION_TEST
	3041	else if (strcmp (my_optstr, "test") == 0) { cmd = CMD_TEST; }
	3042	#endif
	3043	#if VCDIFF_TOOLS
	3044	else if (strcmp (my_optstr, "printhdr") == 0) { cmd = CMD_PRINTHDR; }
	3045	else if (strcmp (my_optstr, "printhdrs") == 0) { cmd = CMD_PRINTHDRS; }
	3046	else if (strcmp (my_optstr, "printdelta") == 0) { cmd = CMD_PRINTDELTA; }
	3047	#endif
	3048
	3049	/* If no option was found and still no command, let the default command be
	3050	* encode. The remaining args are treated as filenames. */
	3051	if (cmd == CMD_NONE)
	3052	{
	3053	cmd = CMD_DEFAULT;
	3054	my_optstr = NULL;
	3055	break;
	3056	}
	3057	else
	3058	{
	3059	/* But if we find a command name, continue the getopt loop. */
	3060	my_optind += 1;
	3061	goto takearg;
	3062	}
	3063
	3064	/* gzip-like options */
	3065	case '0': case '1': case '2': case '3': case '4':
	3066	case '5': case '6': case '7': case '8': case '9':
	3067	option_level = ret - '0';
	3068	break;
	3069	case 'f': option_force = 1; break;
	3070	case 'v': option_verbose += 1; option_quiet = 0; break;
	3071	case 'q': option_quiet = 1; option_verbose = 0; break;
	3072	case 'c': option_stdout = 1; break;
	3073	case 'd':
	3074	if (cmd == CMD_NONE) { cmd = CMD_DECODE; }
	3075	else { ret = main_help (); goto exit; }
	3076	break;
	3077	case 'e':
	3078	#if XD3_ENCODER
	3079	if (cmd == CMD_NONE) { cmd = CMD_ENCODE; }
	3080	else { ret = main_help (); goto exit; }
	3081	break;
	3082	#else
	3083	XPR(NT "encoder support not compiled\n");
	3084	return EXIT_FAILURE;
	3085	#endif
	3086
	3087	case 'n': option_use_checksum = 0; break;
	3088	case 'N': option_no_compress = 1; break;
	3089	case 'T': option_use_altcodetable = 1; break;
	3090	case 'C': option_smatch_config = my_optarg; break;
	3091	case 'J': option_no_output = 1; break;
	3092	case 'S': if (my_optarg == NULL) { option_use_secondary = 0; }
	3093	else { option_use_secondary = 1; option_secondary = my_optarg; } break;
	3094	case 'A': if (my_optarg == NULL) { option_use_appheader = 0; }
	3095	else { option_appheader = (uint8_t*) my_optarg; } break;
	3096	case 'B':
	3097	if ((ret = main_atou (my_optarg, & option_srcwinsz, XD3_MINSRCWINSZ,
	3098	0, 'B')))
	3099	{
	3100	goto exit;
	3101	}
	3102	break;
	3103	case 'I':
	3104	if ((ret = main_atou (my_optarg, & option_iopt_size, 0,
	3105	0, 'I')))
	3106	{
	3107	goto exit;
	3108	}
	3109	break;
	3110	case 'P':
	3111	if ((ret = main_atou (my_optarg, & option_sprevsz, 0,
	3112	0, 'P')))
	3113	{
	3114	goto exit;
	3115	}
	3116	break;
	3117	case 'W':
	3118	if ((ret = main_atou (my_optarg, & option_winsize, XD3_ALLOCSIZE,
	3119	XD3_HARDMAXWINSIZE, 'W')))
	3120	{
	3121	goto exit;
	3122	}
	3123	break;
	3124	case 'D':
	3125	#if EXTERNAL_COMPRESSION == 0
	3126	if (option_verbose > 0)
	3127	{
	3128	XPR(NT "warning: -D option ignored, "
	3129	"external compression support was not compiled\n");
	3130	}
	3131	#else
	3132	option_decompress_inputs = 0;
	3133	#endif
	3134	break;
	3135	case 'R':
	3136	#if EXTERNAL_COMPRESSION == 0
	3137	if (option_verbose > 0)
	3138	{
	3139	XPR(NT "warning: -R option ignored, "
	3140	"external compression support was not compiled\n");
	3141	}
	3142	#else
	3143	option_recompress_outputs = 0;
	3144	#endif
	3145	break;
	3146	case 's':
	3147	if (sfilename != NULL)
	3148	{
	3149	XPR(NT "specify only one source file\n");
	3150	goto cleanup;
	3151	}
	3152
	3153	sfilename = my_optarg;
	3154	break;
	3155
	3156	case 'V':
	3157	ret = main_version (); goto exit;
	3158	default:
	3159	ret = main_help (); goto exit;
	3160	}
	3161	}
	3162
	3163	option_source_filename = sfilename;
	3164
	3165	/* In case there were no arguments, set the default command. */
	3166	if (cmd == CMD_NONE) { cmd = CMD_DEFAULT; }
	3167
	3168	argc -= my_optind;
	3169	argv += my_optind;
	3170
	3171	/* There may be up to two more arguments. */
	3172	if (argc > 2)
	3173	{
	3174	XPR(NT "too many filenames: %s ...\n", argv[2]);
	3175	ret = EXIT_FAILURE;
	3176	goto cleanup;
	3177	}
	3178
	3179	ifile.flags = RD_FIRST;
	3180	sfile.flags = RD_FIRST;
	3181	sfile.filename = option_source_filename;
	3182
	3183	/* The infile takes the next argument, if there is one. But if not, infile is set to
	3184	* stdin. */
	3185	if (argc > 0)
	3186	{
	3187	ifile.filename = argv[0];
	3188
	3189	if ((ret = main_file_open (& ifile, ifile.filename, XO_READ)))
	3190	{
	3191	goto cleanup;
	3192	}
	3193	}
	3194	else
	3195	{
	3196	XSTDIN_XF (& ifile);
	3197	}
	3198
	3199	/* The ofile takes the following argument, if there is one. But if not, it is left NULL
	3200	* until the application header is processed. It will be set in main_open_output. */
	3201	if (argc > 1)
	3202	{
	3203	/* Check for conflicting arguments. */
	3204	if (option_stdout && ! option_quiet)
	3205	{
	3206	XPR(NT "warning: -c option overrides output filename: %s\n", argv[1]);
	3207	}
	3208
	3209	if (! option_stdout) { ofile.filename = argv[1]; }
	3210	}
	3211
	3212	switch (cmd)
	3213	{
	3214	case CMD_PRINTHDR:
	3215	case CMD_PRINTHDRS:
	3216	case CMD_PRINTDELTA:
	3217	#if XD3_ENCODER
	3218	case CMD_ENCODE:
	3219	#endif
	3220	case CMD_DECODE:
	3221	ret = main_input (cmd, & ifile, & ofile, & sfile);
	3222	break;
	3223
	3224	#if REGRESSION_TEST
	3225	case CMD_TEST:
	3226	ret = xd3_selftest ();
	3227	break;
	3228	#endif
	3229
	3230	case CMD_CONFIG:
	3231	ret = main_config ();
	3232	break;
	3233
	3234	default:
	3235	ret = main_help ();
	3236	break;
	3237	}
	3238
	3239	#if EXTERNAL_COMPRESSION
	3240	if (ext_tmpfile != NULL)
	3241	{
	3242	unlink (ext_tmpfile);
	3243	}
	3244	#endif
	3245
	3246	if (0)
	3247	{
	3248	cleanup:
	3249	ret = EXIT_FAILURE;
	3250	exit:
	3251	(void)0;
	3252	}
	3253
	3254	main_file_cleanup (& ifile);
	3255	main_file_cleanup (& ofile);
	3256	main_file_cleanup (& sfile);
	3257
	3258	main_free (free_argv);
	3259	main_free (free_value);
	3260
	3261	main_cleanup ();
	3262
	3263	fflush (stdout);
	3264	fflush (stderr);
	3265	return ret;
	3266	}
	3267
	3268	static int
	3269	main_help (void)
	3270	{
	3271	/* Note: update wiki when command-line features change */
	3272	main_version ();
	3273	DP(RINT "usage: xdelta3 [command/options] [input [output]]\n");
	3274	DP(RINT "special command names:\n");
	3275	DP(RINT " config prints xdelta3 configuration\n");
	3276	DP(RINT " decode decompress the input\n");
	3277	DP(RINT " encode compress the input%s\n", XD3_ENCODER ? "" : " [Not compiled]");
	3278	#if REGRESSION_TEST
	3279	DP(RINT " test run the builtin tests\n");
	3280	#endif
	3281	#if VCDIFF_TOOLS
	3282	DP(RINT "special commands for VCDIFF inputs:\n");
	3283	DP(RINT " printdelta print information about the entire delta\n");
	3284	DP(RINT " printhdr print information about the first window\n");
	3285	DP(RINT " printhdrs print information about all windows\n");
	3286	#endif
	3287	DP(RINT "standard options:\n");
	3288	DP(RINT " -0 .. -9 compression level\n");
	3289	DP(RINT " -c use stdout\n");
	3290	DP(RINT " -d decompress\n");
	3291	DP(RINT " -e compress%s\n", XD3_ENCODER ? "" : " [Not compiled]");
	3292	DP(RINT " -f force overwrite\n");
	3293	DP(RINT " -h show help\n");
	3294	DP(RINT " -q be quiet\n");
	3295	DP(RINT " -v be verbose (max 2)\n");
	3296	DP(RINT " -V show version\n");
	3297
	3298	DP(RINT "memory options:\n");
	3299	DP(RINT " -B bytes source window size\n");
	3300	DP(RINT " -W bytes input window size\n");
	3301	DP(RINT " -P size compression duplicates window\n");
	3302	DP(RINT " -I size instruction buffer size (0 = unlimited)\n");
	3303
	3304	DP(RINT "compression options:\n");
	3305	DP(RINT " -s source source file to copy from (if any)\n");
	3306	DP(RINT " -S [djw\|fgk] enable/disable secondary compression\n");
	3307	DP(RINT " -N disable small string-matching compression\n");
	3308	DP(RINT " -D disable external decompression (encode/decode)\n");
	3309	DP(RINT " -R disable external recompression (decode)\n");
	3310	DP(RINT " -n disable checksum (encode/decode)\n");
	3311	DP(RINT " -C soft config (encode, undocumented)\n");
	3312	DP(RINT " -A [apphead] disable/provide application header (encode)\n");
	3313
	3314	#if XD3_DEBUG > 0
	3315	DP(RINT "developer options:\n");
	3316	DP(RINT " -J disable output (check/compute only)\n");
	3317	DP(RINT " -P repeat count (for profiling)\n");
	3318	DP(RINT " -T use alternate code table\n");
	3319	#endif
	3320
	3321	DP(RINT "the XDELTA environment variable may contain extra args:\n");
	3322	DP(RINT " XDELTA=\"-s source-x.y.tar.gz\" \\\n");
	3323	DP(RINT " tar --use-compress-program=xdelta3 \\\n");
	3324	DP(RINT " -cf target-x.z.tar.gz.vcdiff target-x.y/\n");
	3325	return EXIT_FAILURE;
	3326	}
	3327

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source: nikanabo/current/xdelta/diy/xdelta3-main.h@ 1088

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