Urlader/urlader.c

#ifndef URLADER
# define URLADER "urlader"
#endif
#define URLADER_VERSION "1.0" // a decimal number, not a version string

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>

#include "liblzf/lzf_d.c"

#define TAIL_MAGIC "SCHMORPPACK0"

#ifdef _WIN32

   #include <windows.h>
   //#include <winbase.h>
   #include <shlobj.h>
   #include <shlwapi.h>
   #include <wininet.h>

   static DWORD dword;

   #define u_handle HANDLE
   #define u_valid(handle) (!!handle)

   #define u_setenv(name,value) SetEnvironmentVariable (name, value)
   #define u_mkdir(path) !CreateDirectory (path, NULL)
   #define u_chdir(path) !SetCurrentDirectory (path)
   #define u_rename(fr,to) !MoveFile (fr, to)
   #define u_open(path) CreateFile (path, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL)
   #define u_creat(path,exec) CreateFile (path, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL)
   #define u_close(handle) CloseHandle (handle)
   #define u_append(path,add) PathAppend (path, add)
   #define u_write(handle,data,len) (WriteFile (handle, data, len, &dword, 0) ? dword : -1)

   #define u_fsync(handle) FlushFileBuffers (handle)
   #define u_sync()

#else

   #include <sys/mman.h>
   #include <sys/types.h>
   #include <pwd.h>

   #ifdef PATH_MAX
     #define MAX_PATH (PATH_MAX < 4096 ? 4096 : PATH_MAX)
   #else
     #define MAX_PATH 4096
   #endif

   #define u_handle int
   #define u_valid(fd) ((fd) >= 0)

   #define u_setenv(name,value) setenv (name, value, 1)
   #define u_mkdir(path) mkdir (path, 0777)
   #define u_chdir(path) chdir (path)
   #define u_rename(fr,to) rename (fr, to)
   #define u_open(path) open (path, O_RDONLY)
   #define u_creat(path,exec) open (path, O_WRONLY | O_CREAT | O_TRUNC, (exec) ? 0777 : 0666)
   #define u_close(handle) close (handle)
   #define u_append(path,add) strcat (strcat (path, "/"), add)
   #define u_write(handle,data,len) write (handle, data, len)

   // on a mostly idle system, a sync at the end is certainly faster, hope for the best
   #define u_fsync(handle)
   #define u_sync() sync ()

#endif

#define u_16(ptr) (((ptr)[0] << 8) | (ptr)[1])
#define u_32(ptr) (((ptr)[0] << 24) | ((ptr)[1] << 16) | ((ptr)[2] << 8) | (ptr)[3])

static u_handle pack_handle;
static char tmppath[MAX_PATH];
static char currdir[MAX_PATH];
static char datadir[MAX_PATH];  // %AppData%/urlader
static char exe_dir[MAX_PATH];  // %AppData%/urlader/EXE_ID
static char execdir[MAX_PATH];  // %AppData%/urlader/EXE_ID/EXE_VER
static char exe_id[MAX_PATH];
static char exe_ver[MAX_PATH];

static int exe_argc;
static const char *exe_argv[32];

static void
fatal (const char *msg)
{
#ifdef _WIN32
  MessageBox (0, msg, URLADER, 0);
#else
  fprintf (stderr, "%s: %s\n", URLADER, msg);
#endif

  _exit (1);
}

static void
tmpdir (const char *dir)
{
  static int cnt;

  for (;;)
    {
//      #ifdef _WIN32
//        sprintf (tmppath, "%s/%x_%x.tmp", dir, (unsigned int)GetCurrentProcessId (), ++cnt);
//      #else
        sprintf (tmppath, "%s/t-%x_%x.tmp", dir, (unsigned int)getpid ()             , ++cnt);
//      #endif

      if (!u_mkdir (tmppath))
        return;
    }
}

static void
systemv (const char *const argv[], int dowait)
{
#ifdef _WIN32
  _spawnv (P_WAIT, argv [0], argv);
#else
  pid_t pid = dowait ? fork () : 0;

  if (pid < 0)
    fatal ("fork failure");

  if (!pid)
    {
      execv (argv [0], (void *)argv);
      _exit (124);
    }

  int status;
  waitpid (pid, &status, 0);
#endif
}

static void
deltree (const char *path)
{
  #ifdef _WIN32
    char buf[MAX_PATH * 2 + 64];
    const char *argv[] = { getenv ("COMSPEC"), "/c", "rd", "/s", "/q", buf, 0 };
    sprintf (buf, "\"%s\"", path);
  #else
    const char *argv[] = { "/bin/rm", "-rf", path, 0 };
  #endif
  systemv (argv, 1);
}

enum
{
  T_NULL, // 5
  T_META, // 1 : exe_id, exe_ver
  T_ENV,  // 2 : name, value
  T_ARG,  // 3 : arg
  T_DIR,  // 4+: path
  T_FILE, // 4+: path, data
  T_NUM
};

enum
{
  F_EXEC = 1,
  F_LZF  = 2,
  F_NULL = 0
};

struct hdr
{
  unsigned char type;
  unsigned char flags;
  unsigned char namelen[2];
  unsigned char datalen[4];
};

struct tail {
  unsigned char max_filesize[4];
  unsigned char size[4];
  char magic[12];
};

static char *pack_base, *pack_end;
static struct hdr *pack_cur;
static char *scratch;
static unsigned int scratch_len;

#define PACK_NAME ((char *)(pack_cur + 1))
#define PACK_DATA (PACK_NAME + u_16 (pack_cur->namelen) + 1)
#define PACK_VALID pack_cur->type

static void
pack_next (void)
{
  unsigned int d = u_32 (pack_cur->datalen);

  pack_cur = (struct hdr *)(PACK_DATA + d);
}

static void
pack_unmap (void)
{
  if (!pack_base)
    return;

  free (scratch);

#ifdef _WIN32
  UnmapViewOfFile (pack_base);
#else
  munmap (pack_base, pack_end - pack_base);
#endif
}

static int
pack_map (void)
{
#ifdef _WIN32
  BY_HANDLE_FILE_INFORMATION fi;

  if (!GetFileInformationByHandle (pack_handle, &fi))
    return 0;

  if (fi.nFileSizeHigh) // too big
    return 0;

  HANDLE handle = CreateFileMapping (pack_handle, 0, PAGE_READONLY, 0, fi.nFileSizeLow, NULL);

  if (!handle)
    return 0;

  pack_unmap ();

  pack_base = MapViewOfFile (handle, FILE_MAP_READ, 0, 0, fi.nFileSizeLow);

  CloseHandle (handle);

  pack_end  = pack_base + fi.nFileSizeLow;
#else
  off_t len = lseek (pack_handle - 1, 0, SEEK_END);

  pack_unmap ();

  pack_base = mmap (0, len, PROT_READ, MAP_SHARED, pack_handle - 1, 0);
  if (pack_base == (void *)-1)
    pack_base = 0;

  pack_end = pack_base + len;
#endif

  if (!pack_base)
    return 0;

  struct tail *tail;

  tail = (void *)(pack_end - sizeof (*tail));

  if (memcmp (tail->magic, TAIL_MAGIC, sizeof (TAIL_MAGIC) - 1))
    return 0;

  pack_cur = (struct hdr *)(pack_end - u_32 (tail->size));

  free (scratch);
  scratch = malloc (scratch_len = u_32 (tail->max_filesize));

  return 1;
}

static void
exe_info (void)
{
  if (!pack_map ())
    fatal ("unable to locate packfile in executable - executable corrupted?");

  if (pack_cur->type != T_META)
    fatal ("unable to locate executable metadata - executable corrupted?");

  strcpy (exe_id, PACK_NAME);
}

static void
load (void)
{
  u_mkdir (datadir);

  strcpy (exe_dir, datadir);
  u_append (exe_dir, exe_id);
  u_mkdir (exe_dir);

  if (u_chdir (exe_dir))
    fatal ("unable to change to application data directory");

  u_handle h = u_open ("override");
  if (u_valid (h))
    {
      u_handle oh = pack_handle;

      pack_handle = h;
      if (!pack_map ())
        {
          pack_handle = oh;
          oh = h;
        }

      u_close (oh);
    }

  if (pack_cur->type != T_META)
    fatal ("unable to locate override metadata");

  strcpy (exe_ver, PACK_DATA);
  pack_next ();

  for (;;)
    {
      if (pack_cur->type == T_ENV)
        u_setenv (PACK_NAME, PACK_DATA);
      else if (pack_cur->type == T_ARG)
        exe_argv [exe_argc++] = strdup (PACK_NAME);
      else
        break;

      pack_next ();
    }
 
done_env_arg:
  strcpy (execdir, exe_dir);
  u_append (execdir, "i-");
  strcat (execdir, exe_ver);

  if (access (execdir, F_OK))
    {
      // does not exist yet, so unpack and move
      tmpdir (exe_dir);

      if (u_chdir (tmppath))
        fatal ("unable to change to new instance directory");

      for (;;)
        {
          switch (pack_cur->type)
            {
              case T_DIR:
                u_mkdir (PACK_NAME);
                break;

              case T_FILE:
                {
                  u_handle h = u_creat (PACK_NAME, pack_cur->flags & F_EXEC);
                  unsigned int dlen, len = u_32 (pack_cur->datalen);
                  char *data = PACK_DATA;

                  if (pack_cur->flags & F_LZF)
                    if (dlen = lzf_decompress (data, len, scratch, scratch_len))
                      {
                        data = scratch;
                        len  = dlen;
                      }
                    else
                      fatal ("unable to uncompress file data - pack corrupted?");

                  if (!u_valid (h))
                    fatal ("unable to unpack file from packfile - disk full?");

                  if (u_write (h, data, len) != len)
                    fatal ("unable to unpack file from packfile - disk full?");

                  u_fsync (h);
                  u_close (h);
                }
                break;

              case T_NULL:
                goto done;
            }

          pack_next ();
        }

done:
      if (u_chdir (datadir))
        fatal ("unable to change to data directory");

      u_sync ();

      if (u_rename (tmppath, execdir))
        deltree (tmppath); // if move fails, delete new, assume other process created it independently
    }

  pack_unmap ();
  u_close (pack_handle);

  if (u_chdir (execdir))
    fatal ("unable to change to application instance directory");

  u_setenv ("URLADER_VERSION", URLADER_VERSION);
  u_setenv ("URLADER_DATADIR", datadir);
  u_setenv ("URLADER_EXECDIR", execdir);
  u_setenv ("URLADER_EXE_ID" , exe_id);
  u_setenv ("URLADER_EXE_DIR", exe_dir);
  u_setenv ("URLADER_EXE_VER", exe_ver);

#if 0
  // yes, this is overkill
  u_setenv ("SHLIB_PATH"        , execdir); // hpux
  u_setenv ("LIBPATH"           , execdir); // aix
  u_setenv ("LD_LIBRARY_PATH"   , execdir); // most elf systems
  u_setenv ("LD_LIBRARY_PATH_32", execdir); // solaris
  u_setenv ("LD_LIBRARY_PATH_64", execdir); // solaris
  u_setenv ("LD_LIBRARYN32_PATH", execdir); // irix
  u_setenv ("LD_LIBRARY64_PATH" , execdir); // irix
  u_setenv ("DYLD_LIBRARY_PATH" , execdir); // os sucks from apple
#endif
}

static void
execute (void)
{
  exe_argv [exe_argc] = 0;
  systemv (exe_argv, 0);
}

#ifdef _WIN32

int APIENTRY
WinMain (HINSTANCE hI, HINSTANCE hP, LPSTR argv, int command_show)
{
  if (!GetModuleFileName (hI, tmppath, sizeof (tmppath)))
    fatal ("unable to find executable pack");

  pack_handle = u_open (tmppath);
  if (!u_valid (pack_handle))
    fatal ("unable to open executable pack");

  exe_info ();

  if (!GetCurrentDirectory (sizeof (currdir), currdir))
    strcpy (currdir, ".");

  if (SHGetFolderPath (0, CSIDL_APPDATA | CSIDL_FLAG_CREATE, NULL, SHGFP_TYPE_CURRENT, datadir) != S_OK)
    fatal ("unable to find application data directory");

  u_mkdir (datadir);
  u_append (datadir, URLADER);

  load ();
  execute ();

  return 0;
}

#else

int
main (int argc, char *argv[])
{
  char *home = getenv ("HOME");

  pack_handle = u_open (argv [0]);
  if (!u_valid (pack_handle))
    fatal ("unable to open executable pack");

  exe_info ();

  if (!home)
    {
      struct passwd *pw;

      if ((pw = getpwuid (getuid ())))
        home = pw->pw_dir;
      else
        home = "/tmp";
    }

  if (!getcwd (currdir, sizeof (currdir)))
    strcpy (currdir, ".");

  u_mkdir (home);
  sprintf (datadir, "%s/.%s", home, URLADER);
  u_mkdir (datadir);

#if 0
  if (gethostname (tmppath, sizeof (tmppath)))
    strcpy (tmppath, "default");

  u_append (datadir, tmppath);
#endif

  load ();
  execute ();

  return 0;
}

#endif

Revision:	1.5
Committed:	Fri Dec 30 09:34:20 2011 UTC (12 years, 4 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.4:	+19 -11 lines
Log Message:	* empty log message *
#	Content
1	#ifndef URLADER
2	# define URLADER "urlader"
3	#endif
4	#define URLADER_VERSION "1.0" // a decimal number, not a version string
5
6	#include <stdio.h>
7	#include <stdlib.h>
8	#include <unistd.h>
9	#include <errno.h>
10	#include <string.h>
11	#include <time.h>
12	#include <fcntl.h>
13
14	#include "liblzf/lzf_d.c"
15
16	#define TAIL_MAGIC "SCHMORPPACK0"
17
18	#ifdef _WIN32
19
20	#include <windows.h>
21	//#include <winbase.h>
22	#include <shlobj.h>
23	#include <shlwapi.h>
24	#include <wininet.h>
25
26	static DWORD dword;
27
28	#define u_handle HANDLE
29	#define u_valid(handle) (!!handle)
30
31	#define u_setenv(name,value) SetEnvironmentVariable (name, value)
32	#define u_mkdir(path) !CreateDirectory (path, NULL)
33	#define u_chdir(path) !SetCurrentDirectory (path)
34	#define u_rename(fr,to) !MoveFile (fr, to)
35	#define u_open(path) CreateFile (path, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL \| FILE_FLAG_SEQUENTIAL_SCAN, NULL)
36	#define u_creat(path,exec) CreateFile (path, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL \| FILE_FLAG_SEQUENTIAL_SCAN, NULL)
37	#define u_close(handle) CloseHandle (handle)
38	#define u_append(path,add) PathAppend (path, add)
39	#define u_write(handle,data,len) (WriteFile (handle, data, len, &dword, 0) ? dword : -1)
40
41	#define u_fsync(handle) FlushFileBuffers (handle)
42	#define u_sync()
43
44	#else
45
46	#include <sys/mman.h>
47	#include <sys/types.h>
48	#include <pwd.h>
49
50	#ifdef PATH_MAX
51	#define MAX_PATH (PATH_MAX < 4096 ? 4096 : PATH_MAX)
52	#else
53	#define MAX_PATH 4096
54	#endif
55
56	#define u_handle int
57	#define u_valid(fd) ((fd) >= 0)
58
59	#define u_setenv(name,value) setenv (name, value, 1)
60	#define u_mkdir(path) mkdir (path, 0777)
61	#define u_chdir(path) chdir (path)
62	#define u_rename(fr,to) rename (fr, to)
63	#define u_open(path) open (path, O_RDONLY)
64	#define u_creat(path,exec) open (path, O_WRONLY \| O_CREAT \| O_TRUNC, (exec) ? 0777 : 0666)
65	#define u_close(handle) close (handle)
66	#define u_append(path,add) strcat (strcat (path, "/"), add)
67	#define u_write(handle,data,len) write (handle, data, len)
68
69	// on a mostly idle system, a sync at the end is certainly faster, hope for the best
70	#define u_fsync(handle)
71	#define u_sync() sync ()
72
73	#endif
74
75	#define u_16(ptr) (((ptr)[0] << 8) \| (ptr)[1])
76	#define u_32(ptr) (((ptr)[0] << 24) \| ((ptr)[1] << 16) \| ((ptr)[2] << 8) \| (ptr)[3])
77
78	static u_handle pack_handle;
79	static char tmppath[MAX_PATH];
80	static char currdir[MAX_PATH];
81	static char datadir[MAX_PATH]; // %AppData%/urlader
82	static char exe_dir[MAX_PATH]; // %AppData%/urlader/EXE_ID
83	static char execdir[MAX_PATH]; // %AppData%/urlader/EXE_ID/EXE_VER
84	static char exe_id[MAX_PATH];
85	static char exe_ver[MAX_PATH];
86
87	static int exe_argc;
88	static const char *exe_argv[32];
89
90	static void
91	fatal (const char *msg)
92	{
93	#ifdef _WIN32
94	MessageBox (0, msg, URLADER, 0);
95	#else
96	fprintf (stderr, "%s: %s\n", URLADER, msg);
97	#endif
98
99	_exit (1);
100	}
101
102	static void
103	tmpdir (const char *dir)
104	{
105	static int cnt;
106
107	for (;;)
108	{
109	// #ifdef _WIN32
110	// sprintf (tmppath, "%s/%x_%x.tmp", dir, (unsigned int)GetCurrentProcessId (), ++cnt);
111	// #else
112	sprintf (tmppath, "%s/t-%x_%x.tmp", dir, (unsigned int)getpid () , ++cnt);
113	// #endif
114
115	if (!u_mkdir (tmppath))
116	return;
117	}
118	}
119
120	static void
121	systemv (const char *const argv[], int dowait)
122	{
123	#ifdef _WIN32
124	_spawnv (P_WAIT, argv [0], argv);
125	#else
126	pid_t pid = dowait ? fork () : 0;
127
128	if (pid < 0)
129	fatal ("fork failure");
130
131	if (!pid)
132	{
133	execv (argv [0], (void *)argv);
134	_exit (124);
135	}
136
137	int status;
138	waitpid (pid, &status, 0);
139	#endif
140	}
141
142	static void
143	deltree (const char *path)
144	{
145	#ifdef _WIN32
146	char buf[MAX_PATH * 2 + 64];
147	const char *argv[] = { getenv ("COMSPEC"), "/c", "rd", "/s", "/q", buf, 0 };
148	sprintf (buf, "\"%s\"", path);
149	#else
150	const char *argv[] = { "/bin/rm", "-rf", path, 0 };
151	#endif
152	systemv (argv, 1);
153	}
154
155	enum
156	{
157	T_NULL, // 5
158	T_META, // 1 : exe_id, exe_ver
159	T_ENV, // 2 : name, value
160	T_ARG, // 3 : arg
161	T_DIR, // 4+: path
162	T_FILE, // 4+: path, data
163	T_NUM
164	};
165
166	enum
167	{
168	F_EXEC = 1,
169	F_LZF = 2,
170	F_NULL = 0
171	};
172
173	struct hdr
174	{
175	unsigned char type;
176	unsigned char flags;
177	unsigned char namelen[2];
178	unsigned char datalen[4];
179	};
180
181	struct tail {
182	unsigned char max_filesize[4];
183	unsigned char size[4];
184	char magic[12];
185	};
186
187	static char pack_base, pack_end;
188	static struct hdr *pack_cur;
189	static char *scratch;
190	static unsigned int scratch_len;
191
192	#define PACK_NAME ((char *)(pack_cur + 1))
193	#define PACK_DATA (PACK_NAME + u_16 (pack_cur->namelen) + 1)
194	#define PACK_VALID pack_cur->type
195
196	static void
197	pack_next (void)
198	{
199	unsigned int d = u_32 (pack_cur->datalen);
200
201	pack_cur = (struct hdr *)(PACK_DATA + d);
202	}
203
204	static void
205	pack_unmap (void)
206	{
207	if (!pack_base)
208	return;
209
210	free (scratch);
211
212	#ifdef _WIN32
213	UnmapViewOfFile (pack_base);
214	#else
215	munmap (pack_base, pack_end - pack_base);
216	#endif
217	}
218
219	static int
220	pack_map (void)
221	{
222	#ifdef _WIN32
223	BY_HANDLE_FILE_INFORMATION fi;
224
225	if (!GetFileInformationByHandle (pack_handle, &fi))
226	return 0;
227
228	if (fi.nFileSizeHigh) // too big
229	return 0;
230
231	HANDLE handle = CreateFileMapping (pack_handle, 0, PAGE_READONLY, 0, fi.nFileSizeLow, NULL);
232
233	if (!handle)
234	return 0;
235
236	pack_unmap ();
237
238	pack_base = MapViewOfFile (handle, FILE_MAP_READ, 0, 0, fi.nFileSizeLow);
239
240	CloseHandle (handle);
241
242	pack_end = pack_base + fi.nFileSizeLow;
243	#else
244	off_t len = lseek (pack_handle - 1, 0, SEEK_END);
245
246	pack_unmap ();
247
248	pack_base = mmap (0, len, PROT_READ, MAP_SHARED, pack_handle - 1, 0);
249	if (pack_base == (void *)-1)
250	pack_base = 0;
251
252	pack_end = pack_base + len;
253	#endif
254
255	if (!pack_base)
256	return 0;
257
258	struct tail *tail;
259
260	tail = (void )(pack_end - sizeof (tail));
261
262	if (memcmp (tail->magic, TAIL_MAGIC, sizeof (TAIL_MAGIC) - 1))
263	return 0;
264
265	pack_cur = (struct hdr *)(pack_end - u_32 (tail->size));
266
267	free (scratch);
268	scratch = malloc (scratch_len = u_32 (tail->max_filesize));
269
270	return 1;
271	}
272
273	static void
274	exe_info (void)
275	{
276	if (!pack_map ())
277	fatal ("unable to locate packfile in executable - executable corrupted?");
278
279	if (pack_cur->type != T_META)
280	fatal ("unable to locate executable metadata - executable corrupted?");
281
282	strcpy (exe_id, PACK_NAME);
283	}
284
285	static void
286	load (void)
287	{
288	u_mkdir (datadir);
289
290	strcpy (exe_dir, datadir);
291	u_append (exe_dir, exe_id);
292	u_mkdir (exe_dir);
293
294	if (u_chdir (exe_dir))
295	fatal ("unable to change to application data directory");
296
297	u_handle h = u_open ("override");
298	if (u_valid (h))
299	{
300	u_handle oh = pack_handle;
301
302	pack_handle = h;
303	if (!pack_map ())
304	{
305	pack_handle = oh;
306	oh = h;
307	}
308
309	u_close (oh);
310	}
311
312	if (pack_cur->type != T_META)
313	fatal ("unable to locate override metadata");
314
315	strcpy (exe_ver, PACK_DATA);
316	pack_next ();
317
318	for (;;)
319	{
320	if (pack_cur->type == T_ENV)
321	u_setenv (PACK_NAME, PACK_DATA);
322	else if (pack_cur->type == T_ARG)
323	exe_argv [exe_argc++] = strdup (PACK_NAME);
324	else
325	break;
326
327	pack_next ();
328	}
329
330	done_env_arg:
331	strcpy (execdir, exe_dir);
332	u_append (execdir, "i-");
333	strcat (execdir, exe_ver);
334
335	if (access (execdir, F_OK))
336	{
337	// does not exist yet, so unpack and move
338	tmpdir (exe_dir);
339
340	if (u_chdir (tmppath))
341	fatal ("unable to change to new instance directory");
342
343	for (;;)
344	{
345	switch (pack_cur->type)
346	{
347	case T_DIR:
348	u_mkdir (PACK_NAME);
349	break;
350
351	case T_FILE:
352	{
353	u_handle h = u_creat (PACK_NAME, pack_cur->flags & F_EXEC);
354	unsigned int dlen, len = u_32 (pack_cur->datalen);
355	char *data = PACK_DATA;
356
357	if (pack_cur->flags & F_LZF)
358	if (dlen = lzf_decompress (data, len, scratch, scratch_len))
359	{
360	data = scratch;
361	len = dlen;
362	}
363	else
364	fatal ("unable to uncompress file data - pack corrupted?");
365
366	if (!u_valid (h))
367	fatal ("unable to unpack file from packfile - disk full?");
368
369	if (u_write (h, data, len) != len)
370	fatal ("unable to unpack file from packfile - disk full?");
371
372	u_fsync (h);
373	u_close (h);
374	}
375	break;
376
377	case T_NULL:
378	goto done;
379	}
380
381	pack_next ();
382	}
383
384	done:
385	if (u_chdir (datadir))
386	fatal ("unable to change to data directory");
387
388	u_sync ();
389
390	if (u_rename (tmppath, execdir))
391	deltree (tmppath); // if move fails, delete new, assume other process created it independently
392	}
393
394	pack_unmap ();
395	u_close (pack_handle);
396
397	if (u_chdir (execdir))
398	fatal ("unable to change to application instance directory");
399
400	u_setenv ("URLADER_VERSION", URLADER_VERSION);
401	u_setenv ("URLADER_DATADIR", datadir);
402	u_setenv ("URLADER_EXECDIR", execdir);
403	u_setenv ("URLADER_EXE_ID" , exe_id);
404	u_setenv ("URLADER_EXE_DIR", exe_dir);
405	u_setenv ("URLADER_EXE_VER", exe_ver);
406
407	#if 0
408	// yes, this is overkill
409	u_setenv ("SHLIB_PATH" , execdir); // hpux
410	u_setenv ("LIBPATH" , execdir); // aix
411	u_setenv ("LD_LIBRARY_PATH" , execdir); // most elf systems
412	u_setenv ("LD_LIBRARY_PATH_32", execdir); // solaris
413	u_setenv ("LD_LIBRARY_PATH_64", execdir); // solaris
414	u_setenv ("LD_LIBRARYN32_PATH", execdir); // irix
415	u_setenv ("LD_LIBRARY64_PATH" , execdir); // irix
416	u_setenv ("DYLD_LIBRARY_PATH" , execdir); // os sucks from apple
417	#endif
418	}
419
420	static void
421	execute (void)
422	{
423	exe_argv [exe_argc] = 0;
424	systemv (exe_argv, 0);
425	}
426
427	#ifdef _WIN32
428
429	int APIENTRY
430	WinMain (HINSTANCE hI, HINSTANCE hP, LPSTR argv, int command_show)
431	{
432	if (!GetModuleFileName (hI, tmppath, sizeof (tmppath)))
433	fatal ("unable to find executable pack");
434
435	pack_handle = u_open (tmppath);
436	if (!u_valid (pack_handle))
437	fatal ("unable to open executable pack");
438
439	exe_info ();
440
441	if (!GetCurrentDirectory (sizeof (currdir), currdir))
442	strcpy (currdir, ".");
443
444	if (SHGetFolderPath (0, CSIDL_APPDATA \| CSIDL_FLAG_CREATE, NULL, SHGFP_TYPE_CURRENT, datadir) != S_OK)
445	fatal ("unable to find application data directory");
446
447	u_mkdir (datadir);
448	u_append (datadir, URLADER);
449
450	load ();
451	execute ();
452
453	return 0;
454	}
455
456	#else
457
458	int
459	main (int argc, char *argv[])
460	{
461	char *home = getenv ("HOME");
462
463	pack_handle = u_open (argv [0]);
464	if (!u_valid (pack_handle))
465	fatal ("unable to open executable pack");
466
467	exe_info ();
468
469	if (!home)
470	{
471	struct passwd *pw;
472
473	if ((pw = getpwuid (getuid ())))
474	home = pw->pw_dir;
475	else
476	home = "/tmp";
477	}
478
479	if (!getcwd (currdir, sizeof (currdir)))
480	strcpy (currdir, ".");
481
482	u_mkdir (home);
483	sprintf (datadir, "%s/.%s", home, URLADER);
484	u_mkdir (datadir);
485
486	#if 0
487	if (gethostname (tmppath, sizeof (tmppath)))
488	strcpy (tmppath, "default");
489
490	u_append (datadir, tmppath);
491	#endif
492
493	load ();
494	execute ();
495
496	return 0;
497	}
498
499	#endif
500