548 lines
19 KiB
C
548 lines
19 KiB
C
/*
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Copyright (c) 1990-2009 Info-ZIP. All rights reserved.
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See the accompanying file LICENSE, version 2009-Jan-02 or later
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(the contents of which are also included in unzip.h) for terms of use.
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If, for some reason, all these files are missing, the Info-ZIP license
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also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
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*/
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/* funzip.c -- by Mark Adler */
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#define VERSION "3.95 of 20 January 2009"
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/* Copyright history:
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- Starting with UnZip 5.41 of 16-April-2000, this source file
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is covered by the Info-Zip LICENSE cited above.
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- Prior versions of this source file, found in UnZip source packages
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up to UnZip 5.40, were put in the public domain.
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The original copyright note by Mark Adler was:
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"You can do whatever you like with this source file,
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though I would prefer that if you modify it and
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redistribute it that you include comments to that effect
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with your name and the date. Thank you."
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History:
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vers date who what
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---- --------- -------------- ------------------------------------
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1.0 13 Aug 92 M. Adler really simple unzip filter.
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1.1 13 Aug 92 M. Adler cleaned up somewhat, give help if
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stdin not redirected, warn if more
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zip file entries after the first.
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1.2 15 Aug 92 M. Adler added check of lengths for stored
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entries, added more help.
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1.3 16 Aug 92 M. Adler removed redundant #define's, added
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decryption.
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1.4 27 Aug 92 G. Roelofs added exit(0).
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1.5 1 Sep 92 K. U. Rommel changed read/write modes for OS/2.
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1.6 6 Sep 92 G. Roelofs modified to use dummy crypt.c and
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crypt.h instead of -DCRYPT.
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1.7 23 Sep 92 G. Roelofs changed to use DOS_OS2; included
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crypt.c under MS-DOS.
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1.8 9 Oct 92 M. Adler improved inflation error msgs.
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1.9 17 Oct 92 G. Roelofs changed ULONG/UWORD/byte to ulg/ush/uch;
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renamed inflate_entry() to inflate();
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adapted to use new, in-place zdecode.
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2.0 22 Oct 92 M. Adler allow filename argument, prompt for
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passwords and don't echo, still allow
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command-line password entry, but as an
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option.
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2.1 23 Oct 92 J-l. Gailly fixed crypt/store bug,
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G. Roelofs removed crypt.c under MS-DOS, fixed
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decryption check to compare single byte.
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2.2 28 Oct 92 G. Roelofs removed declaration of key.
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2.3 14 Dec 92 M. Adler replaced fseek (fails on stdin for SCO
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Unix V.3.2.4). added quietflg for
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inflate.c.
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3.0 11 May 93 M. Adler added gzip support
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3.1 9 Jul 93 K. U. Rommel fixed OS/2 pipe bug (PIPE_ERROR)
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3.2 4 Sep 93 G. Roelofs moved crc_32_tab[] to tables.h; used FOPx
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from unzip.h; nuked OUTB macro and outbuf;
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replaced flush(); inlined FlushOutput();
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renamed decrypt to encrypted
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3.3 29 Sep 93 G. Roelofs replaced ReadByte() with NEXTBYTE macro;
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revised (restored?) flush(); added FUNZIP
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3.4 21 Oct 93 G. Roelofs renamed quietflg to qflag; changed outcnt,
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H. Gessau second updcrc() arg and flush() arg to ulg;
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added inflate_free(); added "g =" to null
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getc(in) to avoid compiler warnings
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3.5 31 Oct 93 H. Gessau changed DOS_OS2 to DOS_NT_OS2
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3.6 6 Dec 93 H. Gessau added "near" to mask_bits[]
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3.7 9 Dec 93 G. Roelofs added extent typecasts to fwrite() checks
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3.8 28 Jan 94 GRR/JlG initialized g variable in main() for gcc
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3.81 22 Feb 94 M. Hanning-Lee corrected usage message
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3.82 27 Feb 94 G. Roelofs added some typecasts to avoid warnings
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3.83 22 Jul 94 G. Roelofs changed fprintf to macro for DLLs
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- 2 Aug 94 - public release with UnZip 5.11
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- 28 Aug 94 - public release with UnZip 5.12
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3.84 1 Oct 94 K. U. Rommel changes for Metaware High C
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3.85 29 Oct 94 G. Roelofs changed fprintf macro to Info
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3.86 7 May 95 K. Davis RISCOS patches;
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P. Kienitz Amiga patches
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3.87 12 Aug 95 G. Roelofs inflate_free(), DESTROYGLOBALS fixes
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3.88 4 Sep 95 C. Spieler reordered macro to work around MSC 5.1 bug
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3.89 22 Nov 95 PK/CS ifdef'd out updcrc() for ASM_CRC
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3.9 17 Dec 95 G. Roelofs modified for USE_ZLIB (new fillinbuf())
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- 30 Apr 96 - public release with UnZip 5.2
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3.91 17 Aug 96 G. Roelofs main() -> return int (Peter Seebach)
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3.92 13 Apr 97 G. Roelofs minor cosmetic fixes to messages
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- 22 Apr 97 - public release with UnZip 5.3
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- 31 May 97 - public release with UnZip 5.31
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3.93 20 Sep 97 G. Roelofs minor cosmetic fixes to messages
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- 3 Nov 97 - public release with UnZip 5.32
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- 28 Nov 98 - public release with UnZip 5.4
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- 16 Apr 00 - public release with UnZip 5.41
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- 14 Jan 01 - public release with UnZip 5.42
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3.94 20 Feb 01 C. Spieler added support for Deflate64(tm)
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23 Mar 02 C. Spieler changed mask_bits[] type to "unsigned"
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*/
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/*
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All funzip does is take a zipfile from stdin and decompress the
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first entry to stdout. The entry has to be either deflated or
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stored. If the entry is encrypted, then the decryption password
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must be supplied on the command line as the first argument.
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funzip needs to be linked with inflate.o and crypt.o compiled from
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the unzip source. If decryption is desired, the full version of
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crypt.c (and crypt.h) from zcrypt28.zip or later must be used.
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*/
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#ifndef FUNZIP
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# define FUNZIP
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#endif
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#define UNZIP_INTERNAL
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#include "unzip.h"
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#include "crc32.h"
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#include "crypt.h"
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#include "ttyio.h"
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#ifdef EBCDIC
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# undef EBCDIC /* don't need ebcdic[] */
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#endif
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#ifndef USE_ZLIB /* zlib's function is called inflate(), too */
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# define UZinflate inflate
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#endif
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/* PKZIP header definitions */
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#define ZIPMAG 0x4b50 /* two-byte zip lead-in */
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#define LOCREM 0x0403 /* remaining two bytes in zip signature */
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#define LOCSIG 0x04034b50L /* full signature */
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#define LOCFLG 4 /* offset of bit flag */
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#define CRPFLG 1 /* bit for encrypted entry */
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#define EXTFLG 8 /* bit for extended local header */
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#define LOCHOW 6 /* offset of compression method */
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#define LOCTIM 8 /* file mod time (for decryption) */
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#define LOCCRC 12 /* offset of crc */
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#define LOCSIZ 16 /* offset of compressed size */
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#define LOCLEN 20 /* offset of uncompressed length */
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#define LOCFIL 24 /* offset of file name field length */
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#define LOCEXT 26 /* offset of extra field length */
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#define LOCHDR 28 /* size of local header, including LOCREM */
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#define EXTHDR 16 /* size of extended local header, inc sig */
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/* GZIP header definitions */
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#define GZPMAG 0x8b1f /* two-byte gzip lead-in */
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#define GZPHOW 0 /* offset of method number */
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#define GZPFLG 1 /* offset of gzip flags */
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#define GZPMUL 2 /* bit for multiple-part gzip file */
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#define GZPISX 4 /* bit for extra field present */
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#define GZPISF 8 /* bit for filename present */
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#define GZPISC 16 /* bit for comment present */
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#define GZPISE 32 /* bit for encryption */
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#define GZPTIM 2 /* offset of Unix file modification time */
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#define GZPEXF 6 /* offset of extra flags */
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#define GZPCOS 7 /* offset of operating system compressed on */
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#define GZPHDR 8 /* length of minimal gzip header */
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#ifdef THEOS
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/* Macros cause stack overflow in compiler */
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ush SH(uch* p) { return ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8)); }
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ulg LG(uch* p) { return ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16)); }
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#else /* !THEOS */
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/* Macros for getting two-byte and four-byte header values */
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#define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
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#define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
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#endif /* ?THEOS */
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/* Function prototypes */
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static void err OF((int, char *));
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#if (defined(USE_DEFLATE64) && defined(__16BIT__))
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static int partflush OF((uch *rawbuf, unsigned w));
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#endif
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int main OF((int, char **));
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/* Globals */
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FILE *out; /* output file (*in moved to G struct) */
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ulg outsiz; /* total bytes written to out */
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int encrypted; /* flag to turn on decryption */
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/* Masks for inflate.c */
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ZCONST unsigned near mask_bits[17] = {
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0x0000,
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0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
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0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
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};
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#ifdef USE_ZLIB
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int fillinbuf(__G)
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__GDEF
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/* Fill input buffer for pull-model inflate() in zlib. Return the number of
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* bytes in inbuf. */
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{
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/* GRR: check return value from fread(): same as read()? check errno? */
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if ((G.incnt = fread((char *)G.inbuf, 1, INBUFSIZ, G.in)) <= 0)
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return 0;
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G.inptr = G.inbuf;
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#if CRYPT
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if (encrypted) {
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uch *p;
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int n;
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for (n = G.incnt, p = G.inptr; n--; p++)
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zdecode(*p);
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}
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#endif /* CRYPT */
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return G.incnt;
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}
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#endif /* USE_ZLIB */
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static void err(n, m)
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int n;
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char *m;
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/* Exit on error with a message and a code */
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{
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Info(slide, 1, ((char *)slide, "funzip error: %s\n", m));
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DESTROYGLOBALS();
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EXIT(n);
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}
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#if (defined(USE_DEFLATE64) && defined(__16BIT__))
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static int partflush(rawbuf, w)
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uch *rawbuf; /* start of buffer area to flush */
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extent w; /* number of bytes to flush */
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{
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G.crc32val = crc32(G.crc32val, rawbuf, (extent)w);
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if (fwrite((char *)rawbuf,1,(extent)w,out) != (extent)w && !PIPE_ERROR)
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err(9, "out of space on stdout");
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outsiz += w;
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return 0;
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}
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int flush(w) /* used by inflate.c (FLUSH macro) */
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ulg w; /* number of bytes to flush */
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{
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uch *rawbuf;
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int ret;
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/* On 16-bit systems (MSDOS, OS/2 1.x), the standard C library functions
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* cannot handle writes of 64k blocks at once. For these systems, the
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* blocks to flush are split into pieces of 32k or less.
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*/
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rawbuf = slide;
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while (w > 0x8000L) {
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ret = partflush(rawbuf, 0x8000);
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if (ret != PK_OK)
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return ret;
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w -= 0x8000L;
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rawbuf += (unsigned)0x8000;
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}
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return partflush(rawbuf, (extent)w);
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} /* end function flush() */
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#else /* !(USE_DEFLATE64 && __16BIT__) */
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int flush(w) /* used by inflate.c (FLUSH macro) */
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ulg w; /* number of bytes to flush */
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{
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G.crc32val = crc32(G.crc32val, slide, (extent)w);
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if (fwrite((char *)slide,1,(extent)w,out) != (extent)w && !PIPE_ERROR)
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err(9, "out of space on stdout");
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outsiz += w;
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return 0;
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}
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#endif /* ?(USE_DEFLATE64 && __16BIT__) */
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int main(argc, argv)
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int argc;
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char **argv;
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/* Given a zipfile on stdin, decompress the first entry to stdout. */
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{
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ush n;
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uch h[LOCHDR]; /* first local header (GZPHDR < LOCHDR) */
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int g = 0; /* true if gzip format */
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unsigned method = 0; /* initialized here to shut up gcc warning */
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#if CRYPT
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char *s = " [-password]";
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char *p; /* password */
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#else /* !CRYPT */
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char *s = "";
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#endif /* ?CRYPT */
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CONSTRUCTGLOBALS();
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/* skip executable name */
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argc--;
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argv++;
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#if CRYPT
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/* get the command line password, if any */
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p = (char *)NULL;
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if (argc && **argv == '-')
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{
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argc--;
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p = 1 + *argv++;
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}
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#endif /* CRYPT */
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#ifdef MALLOC_WORK
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/* The following expression is a cooked-down simplyfication of the
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calculation for the work area size of UnZip (see unzip.c). For
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fUnZip, the work area does not need to match the granularity
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of the complex unshrink structures, because it only supports
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inflation. But, like in UnZip, the zcalloc() wrapper function
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is needed for the allocation, to support the 64kByte buffer on
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16-bit systems.
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*/
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# define UZ_SLIDE_CHUNK (sizeof(shrint)+sizeof(uch)+sizeof(uch))
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# define UZ_NUMOF_CHUNKS (unsigned)( (WSIZE+UZ_SLIDE_CHUNK-1)/UZ_SLIDE_CHUNK )
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G.area.Slide = (uch *)zcalloc(UZ_NUMOF_CHUNKS, UZ_SLIDE_CHUNK);
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# undef UZ_SLIDE_CHUNK
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# undef UZ_NUMOF_CHUNKS
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#endif
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/* if no file argument and stdin not redirected, give the user help */
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if (argc == 0 && isatty(0))
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{
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Info(slide, 1, ((char *)slide, "fUnZip (filter UnZip), version %s\n",
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VERSION));
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Info(slide, 1, ((char *)slide, "usage: ... | funzip%s | ...\n", s));
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Info(slide, 1, ((char *)slide, " ... | funzip%s > outfile\n", s));
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Info(slide, 1, ((char *)slide, " funzip%s infile.zip > outfile\n",s));
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Info(slide, 1, ((char *)slide, " funzip%s infile.gz > outfile\n", s));
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Info(slide, 1, ((char *)slide, "Extracts to stdout the gzip file or first\
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zip entry of stdin or the given file.\n"));
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DESTROYGLOBALS();
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EXIT(3);
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}
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/* prepare to be a binary filter */
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if (argc)
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{
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if ((G.in = fopen(*argv, FOPR)) == (FILE *)NULL)
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err(2, "cannot find input file");
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}
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else
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{
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#ifdef DOS_FLX_NLM_OS2_W32
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#if (defined(__HIGHC__) && !defined(FLEXOS))
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setmode(stdin, _BINARY);
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#else
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setmode(0, O_BINARY); /* some buggy C libraries require BOTH setmode() */
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#endif /* call AND the fdopen() in binary mode :-( */
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#endif /* DOS_FLX_NLM_OS2_W32 */
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#ifdef RISCOS
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G.in = stdin;
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#else
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if ((G.in = fdopen(0, FOPR)) == (FILE *)NULL)
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err(2, "cannot find stdin");
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#endif
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}
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#ifdef DOS_FLX_H68_NLM_OS2_W32
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#if (defined(__HIGHC__) && !defined(FLEXOS))
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setmode(stdout, _BINARY);
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#else
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setmode(1, O_BINARY);
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#endif
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#endif /* DOS_FLX_H68_NLM_OS2_W32 */
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#ifdef RISCOS
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out = stdout;
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#else
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if ((out = fdopen(1, FOPW)) == (FILE *)NULL)
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err(2, "cannot write to stdout");
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#endif
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/* read local header, check validity, and skip name and extra fields */
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n = getc(G.in); n |= getc(G.in) << 8;
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if (n == ZIPMAG)
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{
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if (fread((char *)h, 1, LOCHDR, G.in) != LOCHDR || SH(h) != LOCREM)
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err(3, "invalid zipfile");
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switch (method = SH(h + LOCHOW)) {
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case STORED:
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case DEFLATED:
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#ifdef USE_DEFLATE64
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case ENHDEFLATED:
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#endif
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break;
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default:
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err(3, "first entry not deflated or stored--cannot unpack");
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break;
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}
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for (n = SH(h + LOCFIL); n--; ) g = getc(G.in);
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for (n = SH(h + LOCEXT); n--; ) g = getc(G.in);
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g = 0;
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encrypted = h[LOCFLG] & CRPFLG;
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}
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else if (n == GZPMAG)
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{
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if (fread((char *)h, 1, GZPHDR, G.in) != GZPHDR)
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err(3, "invalid gzip file");
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if ((method = h[GZPHOW]) != DEFLATED && method != ENHDEFLATED)
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err(3, "gzip file not deflated");
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if (h[GZPFLG] & GZPMUL)
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err(3, "cannot handle multi-part gzip files");
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if (h[GZPFLG] & GZPISX)
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{
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n = getc(G.in); n |= getc(G.in) << 8;
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while (n--) g = getc(G.in);
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}
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if (h[GZPFLG] & GZPISF)
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while ((g = getc(G.in)) != 0 && g != EOF) ;
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if (h[GZPFLG] & GZPISC)
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while ((g = getc(G.in)) != 0 && g != EOF) ;
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g = 1;
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encrypted = h[GZPFLG] & GZPISE;
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}
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else
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err(3, "input not a zip or gzip file");
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/* if entry encrypted, decrypt and validate encryption header */
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if (encrypted)
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#if CRYPT
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{
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ush i, e;
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if (p == (char *)NULL) {
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if ((p = (char *)malloc(IZ_PWLEN+1)) == (char *)NULL)
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err(1, "out of memory");
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else if ((p = getp("Enter password: ", p, IZ_PWLEN+1)) == (char *)NULL)
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err(1, "no tty to prompt for password");
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}
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/* initialize crc_32_tab pointer for decryption */
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CRC_32_TAB = get_crc_table();
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/* prepare the decryption keys for extraction and check the password */
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init_keys(p);
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for (i = 0; i < RAND_HEAD_LEN; i++)
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e = NEXTBYTE;
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if (e != (ush)(h[LOCFLG] & EXTFLG ? h[LOCTIM + 1] : h[LOCCRC + 3]))
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err(3, "incorrect password for first entry");
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}
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#else /* !CRYPT */
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err(3, "cannot decrypt entry (need to recompile with full crypt.c)");
|
|
#endif /* ?CRYPT */
|
|
|
|
/* prepare output buffer and crc */
|
|
G.outptr = slide;
|
|
G.outcnt = 0L;
|
|
outsiz = 0L;
|
|
G.crc32val = CRCVAL_INITIAL;
|
|
|
|
/* decompress */
|
|
if (g || h[LOCHOW])
|
|
{ /* deflated entry */
|
|
int r;
|
|
|
|
#ifdef USE_ZLIB
|
|
/* need to allocate and prepare input buffer */
|
|
if ((G.inbuf = (uch *)malloc(INBUFSIZ)) == (uch *)NULL)
|
|
err(1, "out of memory");
|
|
#endif /* USE_ZLIB */
|
|
if ((r = UZinflate(__G__ (method == ENHDEFLATED))) != 0) {
|
|
if (r == 3)
|
|
err(1, "out of memory");
|
|
else
|
|
err(4, "invalid compressed data--format violated");
|
|
}
|
|
inflate_free(__G);
|
|
}
|
|
else
|
|
{ /* stored entry */
|
|
register ulg n;
|
|
|
|
n = LG(h + LOCLEN);
|
|
#if CRYPT
|
|
if (n != LG(h + LOCSIZ) - (encrypted ? RAND_HEAD_LEN : 0)) {
|
|
#else
|
|
if (n != LG(h + LOCSIZ)) {
|
|
#endif
|
|
Info(slide, 1, ((char *)slide, "len %ld, siz %ld\n", n, LG(h + LOCSIZ)));
|
|
err(4, "invalid compressed data--length mismatch");
|
|
}
|
|
while (n--) {
|
|
ush c = getc(G.in);
|
|
#if CRYPT
|
|
if (encrypted)
|
|
zdecode(c);
|
|
#endif
|
|
*G.outptr++ = (uch)c;
|
|
#if (defined(USE_DEFLATE64) && defined(__16BIT__))
|
|
if (++G.outcnt == (WSIZE>>1)) /* do FlushOutput() */
|
|
#else
|
|
if (++G.outcnt == WSIZE) /* do FlushOutput() */
|
|
#endif
|
|
{
|
|
G.crc32val = crc32(G.crc32val, slide, (extent)G.outcnt);
|
|
if (fwrite((char *)slide, 1,(extent)G.outcnt,out) != (extent)G.outcnt
|
|
&& !PIPE_ERROR)
|
|
err(9, "out of space on stdout");
|
|
outsiz += G.outcnt;
|
|
G.outptr = slide;
|
|
G.outcnt = 0L;
|
|
}
|
|
}
|
|
}
|
|
if (G.outcnt) /* flush one last time; no need to reset G.outptr/outcnt */
|
|
{
|
|
G.crc32val = crc32(G.crc32val, slide, (extent)G.outcnt);
|
|
if (fwrite((char *)slide, 1,(extent)G.outcnt,out) != (extent)G.outcnt
|
|
&& !PIPE_ERROR)
|
|
err(9, "out of space on stdout");
|
|
outsiz += G.outcnt;
|
|
}
|
|
fflush(out);
|
|
|
|
/* if extended header, get it */
|
|
if (g)
|
|
{
|
|
if (fread((char *)h + LOCCRC, 1, 8, G.in) != 8)
|
|
err(3, "gzip file ended prematurely");
|
|
}
|
|
else
|
|
if ((h[LOCFLG] & EXTFLG) &&
|
|
fread((char *)h + LOCCRC - 4, 1, EXTHDR, G.in) != EXTHDR)
|
|
err(3, "zipfile ended prematurely");
|
|
|
|
/* validate decompression */
|
|
if (LG(h + LOCCRC) != G.crc32val)
|
|
err(4, "invalid compressed data--crc error");
|
|
if (LG((g ? (h + LOCSIZ) : (h + LOCLEN))) != outsiz)
|
|
err(4, "invalid compressed data--length error");
|
|
|
|
/* check if there are more entries */
|
|
if (!g && fread((char *)h, 1, 4, G.in) == 4 && LG(h) == LOCSIG)
|
|
Info(slide, 1, ((char *)slide,
|
|
"funzip warning: zipfile has more than one entry--rest ignored\n"));
|
|
|
|
DESTROYGLOBALS();
|
|
RETURN (0);
|
|
}
|