/*  Copyright (c) 1990-2002 Info-ZIP.  All rights reserved.  See the accompanying file LICENSE, version 2000-Apr-09 or later  (the contents of which are also included in unzip.h) for terms of use.  If, for some reason, all these files are missing, the Info-ZIP license  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html*//* funzip.c -- by Mark Adler */#define VERSION "3.94 of 20 January 2002"/* Copyright history:   - Starting with UnZip 5.41 of 16-April-2000, this source file     is covered by the Info-Zip LICENSE cited above.   - Prior versions of this source file, found in UnZip source packages     up to UnZip 5.40, were put in the public domain.     The original copyright note by Mark Adler was:         "You can do whatever you like with this source file,         though I would prefer that if you modify it and         redistribute it that you include comments to that effect         with your name and the date.  Thank you."   History:   vers     date          who           what   ----   ---------  --------------  ------------------------------------   1.0    13 Aug 92  M. Adler        really simple unzip filter.   1.1    13 Aug 92  M. Adler        cleaned up somewhat, give help if                                     stdin not redirected, warn if more                                     zip file entries after the first.   1.2    15 Aug 92  M. Adler        added check of lengths for stored                                     entries, added more help.   1.3    16 Aug 92  M. Adler        removed redundant #define's, added                                     decryption.   1.4    27 Aug 92  G. Roelofs      added exit(0).   1.5     1 Sep 92  K. U. Rommel    changed read/write modes for OS/2.   1.6     6 Sep 92  G. Roelofs      modified to use dummy crypt.c and                                     crypt.h instead of -DCRYPT.   1.7    23 Sep 92  G. Roelofs      changed to use DOS_OS2; included                                     crypt.c under MS-DOS.   1.8     9 Oct 92  M. Adler        improved inflation error msgs.   1.9    17 Oct 92  G. Roelofs      changed ULONG/UWORD/byte to ulg/ush/uch;                                     renamed inflate_entry() to inflate();                                     adapted to use new, in-place zdecode.   2.0    22 Oct 92  M. Adler        allow filename argument, prompt for                                     passwords and don't echo, still allow                                     command-line password entry, but as an                                     option.   2.1    23 Oct 92  J-l. Gailly     fixed crypt/store bug,                     G. Roelofs      removed crypt.c under MS-DOS, fixed                                     decryption check to compare single byte.   2.2    28 Oct 92  G. Roelofs      removed declaration of key.   2.3    14 Dec 92  M. Adler        replaced fseek (fails on stdin for SCO                                     Unix V.3.2.4).  added quietflg for                                     inflate.c.   3.0    11 May 93  M. Adler        added gzip support   3.1     9 Jul 93  K. U. Rommel    fixed OS/2 pipe bug (PIPE_ERROR)   3.2     4 Sep 93  G. Roelofs      moved crc_32_tab[] to tables.h; used FOPx                                     from unzip.h; nuked OUTB macro and outbuf;                                     replaced flush(); inlined FlushOutput();                                     renamed decrypt to encrypted   3.3    29 Sep 93  G. Roelofs      replaced ReadByte() with NEXTBYTE macro;                                     revised (restored?) flush(); added FUNZIP   3.4    21 Oct 93  G. Roelofs      renamed quietflg to qflag; changed outcnt,                     H. Gessau       second updcrc() arg and flush() arg to ulg;                                     added inflate_free(); added "g =" to null                                     getc(in) to avoid compiler warnings   3.5    31 Oct 93  H. Gessau       changed DOS_OS2 to DOS_NT_OS2   3.6     6 Dec 93  H. Gessau       added "near" to mask_bits[]   3.7     9 Dec 93  G. Roelofs      added extent typecasts to fwrite() checks   3.8    28 Jan 94  GRR/JlG         initialized g variable in main() for gcc   3.81   22 Feb 94  M. Hanning-Lee  corrected usage message   3.82   27 Feb 94  G. Roelofs      added some typecasts to avoid warnings   3.83   22 Jul 94  G. Roelofs      changed fprintf to macro for DLLs    -      2 Aug 94  -               public release with UnZip 5.11    -     28 Aug 94  -               public release with UnZip 5.12   3.84    1 Oct 94  K. U. Rommel    changes for Metaware High C   3.85   29 Oct 94  G. Roelofs      changed fprintf macro to Info   3.86    7 May 95  K. Davis        RISCOS patches;                     P. Kienitz      Amiga patches   3.87   12 Aug 95  G. Roelofs      inflate_free(), DESTROYGLOBALS fixes   3.88    4 Sep 95  C. Spieler      reordered macro to work around MSC 5.1 bug   3.89   22 Nov 95  PK/CS           ifdef'd out updcrc() for ASM_CRC   3.9    17 Dec 95  G. Roelofs      modified for USE_ZLIB (new fillinbuf())    -     30 Apr 96  -               public release with UnZip 5.2   3.91   17 Aug 96  G. Roelofs      main() -> return int (Peter Seebach)   3.92   13 Apr 97  G. Roelofs      minor cosmetic fixes to messages    -     22 Apr 97  -               public release with UnZip 5.3    -     31 May 97  -               public release with UnZip 5.31   3.93   20 Sep 97  G. Roelofs      minor cosmetic fixes to messages    -      3 Nov 97  -               public release with UnZip 5.32    -     28 Nov 98  -               public release with UnZip 5.4    -     16 Apr 00  -               public release with UnZip 5.41    -     14 Jan 01  -               public release with UnZip 5.42   3.94   20 Feb 01  C. Spieler      added support for Deflate64(tm) *//*   All funzip does is take a zipfile from stdin and decompress the   first entry to stdout.  The entry has to be either deflated or   stored.  If the entry is encrypted, then the decryption password   must be supplied on the command line as the first argument.   funzip needs to be linked with inflate.o and crypt.o compiled from   the unzip source.  If decryption is desired, the full version of   crypt.c (and crypt.h) from zcrypt28.zip or later must be used. */#ifndef FUNZIP#  define FUNZIP#endif#define UNZIP_INTERNAL#include "unzip.h"#include "crypt.h"#include "ttyio.h"#ifdef EBCDIC#  undef EBCDIC                 /* don't need ebcdic[] */#endif#include "tables.h"             /* crc_32_tab[] */#ifndef USE_ZLIB  /* zlib's function is called inflate(), too */#  define UZinflate inflate#endif/* PKZIP header definitions */#define ZIPMAG 0x4b50           /* two-byte zip lead-in */#define LOCREM 0x0403           /* remaining two bytes in zip signature */#define LOCSIG 0x04034b50L      /* full signature */#define LOCFLG 4                /* offset of bit flag */#define  CRPFLG 1               /*  bit for encrypted entry */#define  EXTFLG 8               /*  bit for extended local header */#define LOCHOW 6                /* offset of compression method */#define LOCTIM 8                /* file mod time (for decryption) */#define LOCCRC 12               /* offset of crc */#define LOCSIZ 16               /* offset of compressed size */#define LOCLEN 20               /* offset of uncompressed length */#define LOCFIL 24               /* offset of file name field length */#define LOCEXT 26               /* offset of extra field length */#define LOCHDR 28               /* size of local header, including LOCREM */#define EXTHDR 16               /* size of extended local header, inc sig *//* GZIP header definitions */#define GZPMAG 0x8b1f           /* two-byte gzip lead-in */#define GZPHOW 0                /* offset of method number */#define GZPFLG 1                /* offset of gzip flags */#define  GZPMUL 2               /* bit for multiple-part gzip file */#define  GZPISX 4               /* bit for extra field present */#define  GZPISF 8               /* bit for filename present */#define  GZPISC 16              /* bit for comment present */#define  GZPISE 32              /* bit for encryption */#define GZPTIM 2                /* offset of Unix file modification time */#define GZPEXF 6                /* offset of extra flags */#define GZPCOS 7                /* offset of operating system compressed on */#define GZPHDR 8                /* length of minimal gzip header */#ifdef THEOS/* Macros cause stack overflow in compiler */ush SH(uch* p) { return ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8)); }ulg LG(uch* p) { return ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16)); }#else /* !THEOS *//* Macros for getting two-byte and four-byte header values */#define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))#define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))#endif /* ?THEOS *//* Function prototypes */static void err OF((int, char *));#if (defined(USE_DEFLATE64) && defined(__16BIT__))static int partflush OF((uch *rawbuf, unsigned w));#endifint main OF((int, char **));/* Globals */FILE *out;                      /* output file (*in moved to G struct) */ulg outsiz;                     /* total bytes written to out */int encrypted;                  /* flag to turn on decryption *//* Masks for inflate.c */ZCONST ush near mask_bits[] = {    0x0000,    0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,    0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff};#ifdef USE_ZLIBint fillinbuf(__G)__GDEF/* Fill input buffer for pull-model inflate() in zlib.  Return the number of * bytes in inbuf. */{/*   GRR: check return value from fread(): same as read()?  check errno? */  if ((G.incnt = fread((char *)G.inbuf, 1, INBUFSIZ, G.in)) <= 0)    return 0;  G.inptr = G.inbuf;#if CRYPT  if (encrypted) {    uch *p;    int n;    for (n = G.incnt, p = G.inptr;  n--;  p++)      zdecode(*p);  }#endif /* CRYPT */  return G.incnt;}#endif /* USE_ZLIB */#if (!defined(USE_ZLIB) || defined(USE_OWN_CRCTAB))#ifdef USE_ZLIBZCONST uLongf *get_crc_table(){  return (ZCONST uLongf *)crc_32_tab;}#else /* !USE_ZLIB */ZCONST ulg near *get_crc_table(){  return crc_32_tab;}#endif /* ?USE_ZLIB */#endif /* !USE_ZLIB || USE_OWN_CRCTAB */static void err(n, m)int n;char *m;/* Exit on error with a message and a code */{  Info(slide, 1, ((char *)slide, "funzip error: %s\n", m));  DESTROYGLOBALS();  EXIT(n);}#if (defined(USE_DEFLATE64) && defined(__16BIT__))static int partflush(rawbuf, w)uch *rawbuf;     /* start of buffer area to flush */extent w;       /* number of bytes to flush */{  G.crc32val = crc32(G.crc32val, rawbuf, (extent)w);  if (fwrite((char *)rawbuf,1,(extent)w,out) != (extent)w && !PIPE_ERROR)    err(9, "out of space on stdout");  outsiz += w;  return 0;}int flush(w)    /* used by inflate.c (FLUSH macro) */ulg w;          /* number of bytes to flush */{    uch *rawbuf;    int ret;    /* On 16-bit systems (MSDOS, OS/2 1.x), the standard C library functions     * cannot handle writes of 64k blocks at once.  For these systems, the     * blocks to flush are split into pieces of 32k or less.     */    rawbuf = slide;    while (w > 0x8000L) {        ret = partflush(rawbuf, 0x8000);        if (ret != PK_OK)            return ret;        w -= 0x8000L;        rawbuf += (unsigned)0x8000;    }    return partflush(rawbuf, (extent)w);} /* end function flush() */#else /* !(USE_DEFLATE64 && __16BIT__) */