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  1. /*
  2.   Copyright (c) 1990-2009 Info-ZIP.  All rights reserved.
  3.  
  4.   See the accompanying file LICENSE, version 2009-Jan-02 or later
  5.   (the contents of which are also included in unzip.h) for terms of use.
  6.   If, for some reason, all these files are missing, the Info-ZIP license
  7.   also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
  8. */
  9. /* funzip.c -- by Mark Adler */
  10.  
  11. #define VERSION "3.95 of 20 January 2009"
  12.  
  13.  
  14. /* Copyright history:
  15.    - Starting with UnZip 5.41 of 16-April-2000, this source file
  16.      is covered by the Info-Zip LICENSE cited above.
  17.    - Prior versions of this source file, found in UnZip source packages
  18.      up to UnZip 5.40, were put in the public domain.
  19.      The original copyright note by Mark Adler was:
  20.          "You can do whatever you like with this source file,
  21.          though I would prefer that if you modify it and
  22.          redistribute it that you include comments to that effect
  23.          with your name and the date.  Thank you."
  24.  
  25.    History:
  26.    vers     date          who           what
  27.    ----   ---------  --------------  ------------------------------------
  28.    1.0    13 Aug 92  M. Adler        really simple unzip filter.
  29.    1.1    13 Aug 92  M. Adler        cleaned up somewhat, give help if
  30.                                      stdin not redirected, warn if more
  31.                                      zip file entries after the first.
  32.    1.2    15 Aug 92  M. Adler        added check of lengths for stored
  33.                                      entries, added more help.
  34.    1.3    16 Aug 92  M. Adler        removed redundant #define's, added
  35.                                      decryption.
  36.    1.4    27 Aug 92  G. Roelofs      added exit(0).
  37.    1.5     1 Sep 92  K. U. Rommel    changed read/write modes for OS/2.
  38.    1.6     6 Sep 92  G. Roelofs      modified to use dummy crypt.c and
  39.                                      crypt.h instead of -DCRYPT.
  40.    1.7    23 Sep 92  G. Roelofs      changed to use DOS_OS2; included
  41.                                      crypt.c under MS-DOS.
  42.    1.8     9 Oct 92  M. Adler        improved inflation error msgs.
  43.    1.9    17 Oct 92  G. Roelofs      changed ULONG/UWORD/byte to ulg/ush/uch;
  44.                                      renamed inflate_entry() to inflate();
  45.                                      adapted to use new, in-place zdecode.
  46.    2.0    22 Oct 92  M. Adler        allow filename argument, prompt for
  47.                                      passwords and don't echo, still allow
  48.                                      command-line password entry, but as an
  49.                                      option.
  50.    2.1    23 Oct 92  J-l. Gailly     fixed crypt/store bug,
  51.                      G. Roelofs      removed crypt.c under MS-DOS, fixed
  52.                                      decryption check to compare single byte.
  53.    2.2    28 Oct 92  G. Roelofs      removed declaration of key.
  54.    2.3    14 Dec 92  M. Adler        replaced fseek (fails on stdin for SCO
  55.                                      Unix V.3.2.4).  added quietflg for
  56.                                      inflate.c.
  57.    3.0    11 May 93  M. Adler        added gzip support
  58.    3.1     9 Jul 93  K. U. Rommel    fixed OS/2 pipe bug (PIPE_ERROR)
  59.    3.2     4 Sep 93  G. Roelofs      moved crc_32_tab[] to tables.h; used FOPx
  60.                                      from unzip.h; nuked OUTB macro and outbuf;
  61.                                      replaced flush(); inlined FlushOutput();
  62.                                      renamed decrypt to encrypted
  63.    3.3    29 Sep 93  G. Roelofs      replaced ReadByte() with NEXTBYTE macro;
  64.                                      revised (restored?) flush(); added FUNZIP
  65.    3.4    21 Oct 93  G. Roelofs      renamed quietflg to qflag; changed outcnt,
  66.                      H. Gessau       second updcrc() arg and flush() arg to ulg;
  67.                                      added inflate_free(); added "g =" to null
  68.                                      getc(in) to avoid compiler warnings
  69.    3.5    31 Oct 93  H. Gessau       changed DOS_OS2 to DOS_NT_OS2
  70.    3.6     6 Dec 93  H. Gessau       added "near" to mask_bits[]
  71.    3.7     9 Dec 93  G. Roelofs      added extent typecasts to fwrite() checks
  72.    3.8    28 Jan 94  GRR/JlG         initialized g variable in main() for gcc
  73.    3.81   22 Feb 94  M. Hanning-Lee  corrected usage message
  74.    3.82   27 Feb 94  G. Roelofs      added some typecasts to avoid warnings
  75.    3.83   22 Jul 94  G. Roelofs      changed fprintf to macro for DLLs
  76.     -      2 Aug 94  -               public release with UnZip 5.11
  77.     -     28 Aug 94  -               public release with UnZip 5.12
  78.    3.84    1 Oct 94  K. U. Rommel    changes for Metaware High C
  79.    3.85   29 Oct 94  G. Roelofs      changed fprintf macro to Info
  80.    3.86    7 May 95  K. Davis        RISCOS patches;
  81.                      P. Kienitz      Amiga patches
  82.    3.87   12 Aug 95  G. Roelofs      inflate_free(), DESTROYGLOBALS fixes
  83.    3.88    4 Sep 95  C. Spieler      reordered macro to work around MSC 5.1 bug
  84.    3.89   22 Nov 95  PK/CS           ifdef'd out updcrc() for ASM_CRC
  85.    3.9    17 Dec 95  G. Roelofs      modified for USE_ZLIB (new fillinbuf())
  86.     -     30 Apr 96  -               public release with UnZip 5.2
  87.    3.91   17 Aug 96  G. Roelofs      main() -> return int (Peter Seebach)
  88.    3.92   13 Apr 97  G. Roelofs      minor cosmetic fixes to messages
  89.     -     22 Apr 97  -               public release with UnZip 5.3
  90.     -     31 May 97  -               public release with UnZip 5.31
  91.    3.93   20 Sep 97  G. Roelofs      minor cosmetic fixes to messages
  92.     -      3 Nov 97  -               public release with UnZip 5.32
  93.     -     28 Nov 98  -               public release with UnZip 5.4
  94.     -     16 Apr 00  -               public release with UnZip 5.41
  95.     -     14 Jan 01  -               public release with UnZip 5.42
  96.    3.94   20 Feb 01  C. Spieler      added support for Deflate64(tm)
  97.           23 Mar 02  C. Spieler      changed mask_bits[] type to "unsigned"
  98.  */
  99.  
  100.  
  101. /*
  102.  
  103.    All funzip does is take a zipfile from stdin and decompress the
  104.    first entry to stdout.  The entry has to be either deflated or
  105.    stored.  If the entry is encrypted, then the decryption password
  106.    must be supplied on the command line as the first argument.
  107.  
  108.    funzip needs to be linked with inflate.o and crypt.o compiled from
  109.    the unzip source.  If decryption is desired, the full version of
  110.    crypt.c (and crypt.h) from zcrypt28.zip or later must be used.
  111.  
  112.  */
  113.  
  114. #ifndef FUNZIP
  115. #  define FUNZIP
  116. #endif
  117. #define UNZIP_INTERNAL
  118. #include "unzip.h"
  119. #include "crc32.h"
  120. #include "crypt.h"
  121. #include "ttyio.h"
  122.  
  123. #ifdef EBCDIC
  124. #  undef EBCDIC                 /* don't need ebcdic[] */
  125. #endif
  126.  
  127. #ifndef USE_ZLIB  /* zlib's function is called inflate(), too */
  128. #  define UZinflate inflate
  129. #endif
  130.  
  131. /* PKZIP header definitions */
  132. #define ZIPMAG 0x4b50           /* two-byte zip lead-in */
  133. #define LOCREM 0x0403           /* remaining two bytes in zip signature */
  134. #define LOCSIG 0x04034b50L      /* full signature */
  135. #define LOCFLG 4                /* offset of bit flag */
  136. #define  CRPFLG 1               /*  bit for encrypted entry */
  137. #define  EXTFLG 8               /*  bit for extended local header */
  138. #define LOCHOW 6                /* offset of compression method */
  139. #define LOCTIM 8                /* file mod time (for decryption) */
  140. #define LOCCRC 12               /* offset of crc */
  141. #define LOCSIZ 16               /* offset of compressed size */
  142. #define LOCLEN 20               /* offset of uncompressed length */
  143. #define LOCFIL 24               /* offset of file name field length */
  144. #define LOCEXT 26               /* offset of extra field length */
  145. #define LOCHDR 28               /* size of local header, including LOCREM */
  146. #define EXTHDR 16               /* size of extended local header, inc sig */
  147.  
  148. /* GZIP header definitions */
  149. #define GZPMAG 0x8b1f           /* two-byte gzip lead-in */
  150. #define GZPHOW 0                /* offset of method number */
  151. #define GZPFLG 1                /* offset of gzip flags */
  152. #define  GZPMUL 2               /* bit for multiple-part gzip file */
  153. #define  GZPISX 4               /* bit for extra field present */
  154. #define  GZPISF 8               /* bit for filename present */
  155. #define  GZPISC 16              /* bit for comment present */
  156. #define  GZPISE 32              /* bit for encryption */
  157. #define GZPTIM 2                /* offset of Unix file modification time */
  158. #define GZPEXF 6                /* offset of extra flags */
  159. #define GZPCOS 7                /* offset of operating system compressed on */
  160. #define GZPHDR 8                /* length of minimal gzip header */
  161.  
  162. #ifdef THEOS
  163. /* Macros cause stack overflow in compiler */
  164. ush SH(uch* p) { return ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8)); }
  165. ulg LG(uch* p) { return ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16)); }
  166. #else /* !THEOS */
  167. /* Macros for getting two-byte and four-byte header values */
  168. #define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
  169. #define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
  170. #endif /* ?THEOS */
  171.  
  172. /* Function prototypes */
  173. static void err OF((int, char *));
  174. #if (defined(USE_DEFLATE64) && defined(__16BIT__))
  175. static int partflush OF((uch *rawbuf, unsigned w));
  176. #endif
  177. int main OF((int, char **));
  178.  
  179. /* Globals */
  180. FILE *out;                      /* output file (*in moved to G struct) */
  181. ulg outsiz;                     /* total bytes written to out */
  182. int encrypted;                  /* flag to turn on decryption */
  183.  
  184. /* Masks for inflate.c */
  185. ZCONST unsigned near mask_bits[17] = {
  186.     0x0000,
  187.     0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
  188.     0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
  189. };
  190.  
  191.  
  192. #ifdef USE_ZLIB
  193.  
  194. int fillinbuf(__G)
  195. __GDEF
  196. /* Fill input buffer for pull-model inflate() in zlib.  Return the number of
  197.  * bytes in inbuf. */
  198. {
  199. /*   GRR: check return value from fread(): same as read()?  check errno? */
  200.   if ((G.incnt = fread((char *)G.inbuf, 1, INBUFSIZ, G.in)) <= 0)
  201.     return 0;
  202.   G.inptr = G.inbuf;
  203.  
  204. #if CRYPT
  205.   if (encrypted) {
  206.     uch *p;
  207.     int n;
  208.  
  209.     for (n = G.incnt, p = G.inptr;  n--;  p++)
  210.       zdecode(*p);
  211.   }
  212. #endif /* CRYPT */
  213.  
  214.   return G.incnt;
  215.  
  216. }
  217.  
  218. #endif /* USE_ZLIB */
  219.  
  220.  
  221. static void err(n, m)
  222. int n;
  223. char *m;
  224. /* Exit on error with a message and a code */
  225. {
  226.   Info(slide, 1, ((char *)slide, "funzip error: %s\n", m));
  227.   DESTROYGLOBALS();
  228.   EXIT(n);
  229. }
  230.  
  231.  
  232. #if (defined(USE_DEFLATE64) && defined(__16BIT__))
  233.  
  234. static int partflush(rawbuf, w)
  235. uch *rawbuf;     /* start of buffer area to flush */
  236. extent w;       /* number of bytes to flush */
  237. {
  238.   G.crc32val = crc32(G.crc32val, rawbuf, (extent)w);
  239.   if (fwrite((char *)rawbuf,1,(extent)w,out) != (extent)w && !PIPE_ERROR)
  240.     err(9, "out of space on stdout");
  241.   outsiz += w;
  242.   return 0;
  243. }
  244.  
  245.  
  246. int flush(w)    /* used by inflate.c (FLUSH macro) */
  247. ulg w;          /* number of bytes to flush */
  248. {
  249.     uch *rawbuf;
  250.     int ret;
  251.  
  252.     /* On 16-bit systems (MSDOS, OS/2 1.x), the standard C library functions
  253.      * cannot handle writes of 64k blocks at once.  For these systems, the
  254.      * blocks to flush are split into pieces of 32k or less.
  255.      */
  256.     rawbuf = slide;
  257.     while (w > 0x8000L) {
  258.         ret = partflush(rawbuf, 0x8000);
  259.         if (ret != PK_OK)
  260.             return ret;
  261.         w -= 0x8000L;
  262.         rawbuf += (unsigned)0x8000;
  263.     }
  264.     return partflush(rawbuf, (extent)w);
  265. } /* end function flush() */
  266.  
  267. #else /* !(USE_DEFLATE64 && __16BIT__) */
  268.  
  269. int flush(w)    /* used by inflate.c (FLUSH macro) */
  270. ulg w;          /* number of bytes to flush */
  271. {
  272.   G.crc32val = crc32(G.crc32val, slide, (extent)w);
  273.   if (fwrite((char *)slide,1,(extent)w,out) != (extent)w && !PIPE_ERROR)
  274.     err(9, "out of space on stdout");
  275.   outsiz += w;
  276.   return 0;
  277. }
  278.  
  279. #endif /* ?(USE_DEFLATE64 && __16BIT__) */
  280.  
  281.  
  282. int main(argc, argv)
  283. int argc;
  284. char **argv;
  285. /* Given a zipfile on stdin, decompress the first entry to stdout. */
  286. {
  287.   ush n;
  288.   uch h[LOCHDR];                /* first local header (GZPHDR < LOCHDR) */
  289.   int g = 0;                    /* true if gzip format */
  290.   unsigned method = 0;          /* initialized here to shut up gcc warning */
  291. #if CRYPT
  292.   char *s = " [-password]";
  293.   char *p;                      /* password */
  294. #else /* !CRYPT */
  295.   char *s = "";
  296. #endif /* ?CRYPT */
  297.   CONSTRUCTGLOBALS();
  298.  
  299.   /* skip executable name */
  300.   argc--;
  301.   argv++;
  302.  
  303. #if CRYPT
  304.   /* get the command line password, if any */
  305.   p = (char *)NULL;
  306.   if (argc && **argv == '-')
  307.   {
  308.     argc--;
  309.     p = 1 + *argv++;
  310.   }
  311. #endif /* CRYPT */
  312.  
  313. #ifdef MALLOC_WORK
  314.   /* The following expression is a cooked-down simplyfication of the
  315.      calculation for the work area size of UnZip (see unzip.c).  For
  316.      fUnZip, the work area does not need to match the granularity
  317.      of the complex unshrink structures, because it only supports
  318.      inflation.  But, like in UnZip, the zcalloc() wrapper function
  319.      is needed for the allocation, to support the 64kByte buffer on
  320.      16-bit systems.
  321.    */
  322. # define UZ_SLIDE_CHUNK (sizeof(shrint)+sizeof(uch)+sizeof(uch))
  323. # define UZ_NUMOF_CHUNKS (unsigned)( (WSIZE+UZ_SLIDE_CHUNK-1)/UZ_SLIDE_CHUNK )
  324.   G.area.Slide = (uch *)zcalloc(UZ_NUMOF_CHUNKS, UZ_SLIDE_CHUNK);
  325. # undef UZ_SLIDE_CHUNK
  326. # undef UZ_NUMOF_CHUNKS
  327. #endif
  328.  
  329.   /* if no file argument and stdin not redirected, give the user help */
  330.   if (argc == 0 && isatty(0))
  331.   {
  332.     Info(slide, 1, ((char *)slide, "fUnZip (filter UnZip), version %s\n",
  333.       VERSION));
  334.     Info(slide, 1, ((char *)slide, "usage: ... | funzip%s | ...\n", s));
  335.     Info(slide, 1, ((char *)slide, "       ... | funzip%s > outfile\n", s));
  336.     Info(slide, 1, ((char *)slide, "       funzip%s infile.zip > outfile\n",s));
  337.     Info(slide, 1, ((char *)slide, "       funzip%s infile.gz > outfile\n", s));
  338.     Info(slide, 1, ((char *)slide, "Extracts to stdout the gzip file or first\
  339. zip entry of stdin or the given file.\n"));
  340.     DESTROYGLOBALS();
  341.     EXIT(3);
  342.   }
  343.  
  344.   /* prepare to be a binary filter */
  345.   if (argc)
  346.   {
  347.     if ((G.in = fopen(*argv, FOPR)) == (FILE *)NULL)
  348.       err(2, "cannot find input file");
  349.   }
  350.   else
  351.   {
  352. #ifdef DOS_FLX_NLM_OS2_W32
  353. #if (defined(__HIGHC__) && !defined(FLEXOS))
  354.     setmode(stdin, _BINARY);
  355. #else
  356.     setmode(0, O_BINARY);  /* some buggy C libraries require BOTH setmode() */
  357. #endif                     /*  call AND the fdopen() in binary mode :-( */
  358. #endif /* DOS_FLX_NLM_OS2_W32 */
  359.  
  360. #ifdef RISCOS
  361.     G.in = stdin;
  362. #else
  363.     if ((G.in = fdopen(0, FOPR)) == (FILE *)NULL)
  364.       err(2, "cannot find stdin");
  365. #endif
  366.   }
  367.  
  368. #ifdef DOS_FLX_H68_NLM_OS2_W32
  369. #if (defined(__HIGHC__) && !defined(FLEXOS))
  370.   setmode(stdout, _BINARY);
  371. #else
  372.   setmode(1, O_BINARY);
  373. #endif
  374. #endif /* DOS_FLX_H68_NLM_OS2_W32 */
  375.  
  376. #ifdef RISCOS
  377.   out = stdout;
  378. #else
  379.   if ((out = fdopen(1, FOPW)) == (FILE *)NULL)
  380.     err(2, "cannot write to stdout");
  381. #endif
  382.  
  383.   /* read local header, check validity, and skip name and extra fields */
  384.   n = getc(G.in);  n |= getc(G.in) << 8;
  385.   if (n == ZIPMAG)
  386.   {
  387.     if (fread((char *)h, 1, LOCHDR, G.in) != LOCHDR || SH(h) != LOCREM)
  388.       err(3, "invalid zipfile");
  389.     switch (method = SH(h + LOCHOW)) {
  390.       case STORED:
  391.       case DEFLATED:
  392. #ifdef USE_DEFLATE64
  393.       case ENHDEFLATED:
  394. #endif
  395.         break;
  396.       default:
  397.         err(3, "first entry not deflated or stored--cannot unpack");
  398.         break;
  399.     }
  400.     for (n = SH(h + LOCFIL); n--; ) g = getc(G.in);
  401.     for (n = SH(h + LOCEXT); n--; ) g = getc(G.in);
  402.     g = 0;
  403.     encrypted = h[LOCFLG] & CRPFLG;
  404.   }
  405.   else if (n == GZPMAG)
  406.   {
  407.     if (fread((char *)h, 1, GZPHDR, G.in) != GZPHDR)
  408.       err(3, "invalid gzip file");
  409.     if ((method = h[GZPHOW]) != DEFLATED && method != ENHDEFLATED)
  410.       err(3, "gzip file not deflated");
  411.     if (h[GZPFLG] & GZPMUL)
  412.       err(3, "cannot handle multi-part gzip files");
  413.     if (h[GZPFLG] & GZPISX)
  414.     {
  415.       n = getc(G.in);  n |= getc(G.in) << 8;
  416.       while (n--) g = getc(G.in);
  417.     }
  418.     if (h[GZPFLG] & GZPISF)
  419.       while ((g = getc(G.in)) != 0 && g != EOF) ;
  420.     if (h[GZPFLG] & GZPISC)
  421.       while ((g = getc(G.in)) != 0 && g != EOF) ;
  422.     g = 1;
  423.     encrypted = h[GZPFLG] & GZPISE;
  424.   }
  425.   else
  426.     err(3, "input not a zip or gzip file");
  427.  
  428.   /* if entry encrypted, decrypt and validate encryption header */
  429.   if (encrypted)
  430. #if CRYPT
  431.     {
  432.       ush i, e;
  433.  
  434.       if (p == (char *)NULL) {
  435.         if ((p = (char *)malloc(IZ_PWLEN+1)) == (char *)NULL)
  436.           err(1, "out of memory");
  437.         else if ((p = getp("Enter password: ", p, IZ_PWLEN+1)) == (char *)NULL)
  438.           err(1, "no tty to prompt for password");
  439.       }
  440.       /* initialize crc_32_tab pointer for decryption */
  441.       CRC_32_TAB = get_crc_table();
  442.       /* prepare the decryption keys for extraction and check the password */
  443.       init_keys(p);
  444.       for (i = 0; i < RAND_HEAD_LEN; i++)
  445.         e = NEXTBYTE;
  446.       if (e != (ush)(h[LOCFLG] & EXTFLG ? h[LOCTIM + 1] : h[LOCCRC + 3]))
  447.         err(3, "incorrect password for first entry");
  448.     }
  449. #else /* !CRYPT */
  450.     err(3, "cannot decrypt entry (need to recompile with full crypt.c)");
  451. #endif /* ?CRYPT */
  452.  
  453.   /* prepare output buffer and crc */
  454.   G.outptr = slide;
  455.   G.outcnt = 0L;
  456.   outsiz = 0L;
  457.   G.crc32val = CRCVAL_INITIAL;
  458.  
  459.   /* decompress */
  460.   if (g || h[LOCHOW])
  461.   {                             /* deflated entry */
  462.     int r;
  463.  
  464. #ifdef USE_ZLIB
  465.     /* need to allocate and prepare input buffer */
  466.     if ((G.inbuf = (uch *)malloc(INBUFSIZ)) == (uch *)NULL)
  467.        err(1, "out of memory");
  468. #endif /* USE_ZLIB */
  469.     if ((r = UZinflate(__G__ (method == ENHDEFLATED))) != 0) {
  470.       if (r == 3)
  471.         err(1, "out of memory");
  472.       else
  473.         err(4, "invalid compressed data--format violated");
  474.     }
  475.     inflate_free(__G);
  476.   }
  477.   else
  478.   {                             /* stored entry */
  479.     register ulg n;
  480.  
  481.     n = LG(h + LOCLEN);
  482. #if CRYPT
  483.     if (n != LG(h + LOCSIZ) - (encrypted ? RAND_HEAD_LEN : 0)) {
  484. #else
  485.     if (n != LG(h + LOCSIZ)) {
  486. #endif
  487.       Info(slide, 1, ((char *)slide, "len %ld, siz %ld\n", n, LG(h + LOCSIZ)));
  488.       err(4, "invalid compressed data--length mismatch");
  489.     }
  490.     while (n--) {
  491.       ush c = getc(G.in);
  492. #if CRYPT
  493.       if (encrypted)
  494.         zdecode(c);
  495. #endif
  496.       *G.outptr++ = (uch)c;
  497. #if (defined(USE_DEFLATE64) && defined(__16BIT__))
  498.       if (++G.outcnt == (WSIZE>>1))     /* do FlushOutput() */
  499. #else
  500.       if (++G.outcnt == WSIZE)    /* do FlushOutput() */
  501. #endif
  502.       {
  503.         G.crc32val = crc32(G.crc32val, slide, (extent)G.outcnt);
  504.         if (fwrite((char *)slide, 1,(extent)G.outcnt,out) != (extent)G.outcnt
  505.             && !PIPE_ERROR)
  506.           err(9, "out of space on stdout");
  507.         outsiz += G.outcnt;
  508.         G.outptr = slide;
  509.         G.outcnt = 0L;
  510.       }
  511.     }
  512.   }
  513.   if (G.outcnt)   /* flush one last time; no need to reset G.outptr/outcnt */
  514.   {
  515.     G.crc32val = crc32(G.crc32val, slide, (extent)G.outcnt);
  516.     if (fwrite((char *)slide, 1,(extent)G.outcnt,out) != (extent)G.outcnt
  517.         && !PIPE_ERROR)
  518.       err(9, "out of space on stdout");
  519.     outsiz += G.outcnt;
  520.   }
  521.   fflush(out);
  522.  
  523.   /* if extended header, get it */
  524.   if (g)
  525.   {
  526.     if (fread((char *)h + LOCCRC, 1, 8, G.in) != 8)
  527.       err(3, "gzip file ended prematurely");
  528.   }
  529.   else
  530.     if ((h[LOCFLG] & EXTFLG) &&
  531.         fread((char *)h + LOCCRC - 4, 1, EXTHDR, G.in) != EXTHDR)
  532.       err(3, "zipfile ended prematurely");
  533.  
  534.   /* validate decompression */
  535.   if (LG(h + LOCCRC) != G.crc32val)
  536.     err(4, "invalid compressed data--crc error");
  537.   if (LG((g ? (h + LOCSIZ) : (h + LOCLEN))) != outsiz)
  538.     err(4, "invalid compressed data--length error");
  539.  
  540.   /* check if there are more entries */
  541.   if (!g && fread((char *)h, 1, 4, G.in) == 4 && LG(h) == LOCSIG)
  542.     Info(slide, 1, ((char *)slide,
  543.       "funzip warning: zipfile has more than one entry--rest ignored\n"));
  544.  
  545.   DESTROYGLOBALS();
  546.   RETURN (0);
  547. }
  548.