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- /* funzip.c -- Not copyrighted 1992,1993 by Mark Adler */
-
- #define VERSION "3.0 of 11 May 1993"
-
-
- /* 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. 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
- */
-
-
- /*
-
- All funzip does is take a zip file 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 zcrypt20.zip or later must be used.
-
- */
-
- #include "unzip.h"
- #include "crypt.h"
-
- /* enforce binary i/o if recognized */
- #if defined(__STDC__) || defined(DOS_OS2)
- # define BINIO
- #endif
-
- #ifdef BINIO
- # define FOPR "rb"
- # define FOPW "wb"
- #else
- # define FOPR "r"
- # define FOPW "w"
- #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 */
-
- /* 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))
-
- /* Function prototypes */
- ulg updcrc OF((uch *, int));
- int inflate OF((void));
- void err OF((int, char *));
- void main OF((int, char **));
-
- /* Globals */
- FILE *in, *out; /* input and output files */
- union work area; /* inflate sliding window */
- uch *outbuf; /* malloc'ed output buffer */
- uch *outptr; /* points to next byte in output buffer */
- int outcnt; /* bytes in output buffer */
- ulg outsiz; /* total bytes written to out */
- int decrypt; /* flag to turn on decryption */
- int quietflg = 1; /* turn off messages in inflate.c */
-
- /* Masks for inflate.c */
- ush mask_bits[] = {
- 0x0000,
- 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
- 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
- };
-
-
- /* Table of CRC-32's of all single-byte values (made by makecrc.c) */
- ulg crc_32_tab[] = {
- 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
- 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
- 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
- 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
- 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
- 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
- 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
- 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
- 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
- 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
- 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
- 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
- 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
- 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
- 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
- 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
- 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
- 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
- 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
- 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
- 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
- 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
- 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
- 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
- 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
- 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
- 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
- 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
- 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
- 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
- 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
- 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
- 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
- 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
- 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
- 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
- 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
- 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
- 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
- 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
- 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
- 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
- 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
- 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
- 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
- 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
- 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
- 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
- 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
- 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
- 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
- 0x2d02ef8dL
- };
-
-
- ulg updcrc(s, n)
- uch *s; /* pointer to bytes to pump through */
- int n; /* number of bytes in s[] */
- /* Run a set of bytes through the crc shift register. If s is a NULL
- pointer, then initialize the crc shift register contents instead.
- Return the current crc in either case. */
- {
- register ulg c; /* temporary variable */
-
- static ulg crc = 0xffffffffL; /* shift register contents */
-
- if (s == NULL)
- c = 0xffffffffL;
- else
- {
- c = crc;
- while (n--)
- c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
- }
- crc = c;
- return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
- }
-
-
- void err(n, m)
- int n;
- char *m;
- /* Exit on error with a message and a code */
- {
- fprintf(stderr, "funzip error: %s\n", m);
- exit(n);
- }
-
-
- int ReadByte(b)
- ush *b;
- /* Used by inflate.c to get a byte (archaism from unzip) */
- {
- register int c = getc(in);
-
- if (c == EOF)
- return 0;
- #ifdef CRYPT
- if (decrypt)
- zdecode(c);
- #endif
- *b = (ush)c;
- return 8;
- }
-
-
- int FlushOutput()
- /* Empty output buffer */
- {
- if (outcnt)
- {
- updcrc(outbuf, outcnt);
- if (fwrite((char *)outbuf, 1,outcnt,out) != outcnt)
- err(9, "out of space on stdout");
- outsiz += outcnt;
- outptr = outbuf;
- outcnt = 0;
- }
- return 0;
- }
-
-
- void main(argc, argv)
- int argc;
- char **argv;
- /* Given a zip file on stdin, decompress the first entry to stdout. */
- {
- ush n;
- uch h[LOCHDR]; /* first local header (GZPHDR < LOCHDR) */
- int g; /* true if gzip format */
- #ifdef CRYPT
- char *s = " [-password]";
- char *p; /* password */
- #else /* !CRYPT */
- char *s = "";
- #endif /* ?CRYPT */
-
- /* skip executable name */
- argc--;
- argv++;
-
- #ifdef CRYPT
- /* get the command line password, if any */
- p = NULL;
- if (argc && **argv == '-')
- {
- argc--;
- p = 1 + *argv++;
- }
- #endif /* ?CRYPT */
-
- /* if no file argument and stdin not redirected, give the user help */
- if (argc == 0 && isatty(0))
- {
- fprintf(stderr, "FUnZip (Filter UnZip), version %s\n", VERSION);
- fprintf(stderr, "usage: ... | funzip%s | ...\n", s);
- fprintf(stderr, " ... | funzip%s > outfile\n", s);
- fprintf(stderr, " funzip%s infile.zip > outfile\n", s);
- fprintf(stderr, " funzip%s infile.gz > outfile\n", s);
- fprintf(stderr,
- " extracts to stdout the gzip file or first zip entry of stdin.\n");
- exit(3);
- }
-
- /* prepare to be a binary filter */
- if ((outbuf = (uch *)malloc(OUTBUFSIZ)) == NULL)
- err(1, "out of memory");
- if (argc)
- {
- if ((in = fopen(*argv, FOPR)) == NULL)
- err(2, "cannot find input file");
- }
- else
- {
- #ifdef DOS_OS2
- setmode(0, O_BINARY); /* some buggy C libraries require BOTH :-( the */
- #endif /* setmode() call AND the fdopen() in binary mode */
- if ((in = fdopen(0, FOPR)) == NULL)
- err(2, "cannot find stdin");
- }
- #ifdef DOS_OS2
- setmode(1, O_BINARY);
- #endif
- if ((out = fdopen(1, FOPW)) == NULL)
- err(2, "cannot write to stdout");
-
- /* read local header, check validity, and skip name and extra fields */
- n = getc(in); n |= getc(in) << 8;
- if (n == ZIPMAG)
- {
- if (fread((char *)h, 1, LOCHDR, in) != LOCHDR || SH(h) != LOCREM)
- err(3, "invalid zip file");
- if (SH(h + LOCHOW) != STORED && SH(h + LOCHOW) != DEFLATED)
- err(3, "first entry not deflated or stored--can't funzip");
- for (n = SH(h + LOCFIL); n--; ) getc(in);
- for (n = SH(h + LOCEXT); n--; ) getc(in);
- g = 0;
- decrypt = h[LOCFLG] & CRPFLG;
- }
- else if (n == GZPMAG)
- {
- if (fread((char *)h, 1, GZPHDR, in) != GZPHDR)
- err(3, "invalid gzip file");
- if (h[GZPHOW] != DEFLATED)
- err(3, "gzip file not deflated");
- if (h[GZPFLG] & GZPMUL)
- err(3, "cannot handle multi-part gzip files");
- if (h[GZPFLG] & GZPISX)
- {
- n = getc(in); n |= getc(in) << 8;
- while (n--) getc(in);
- }
- if (h[GZPFLG] & GZPISF)
- while ((g = getc(in)) != 0 && g != EOF) ;
- if (h[GZPFLG] & GZPISC)
- while ((g = getc(in)) != 0 && g != EOF) ;
- g = 1;
- decrypt = h[GZPFLG] & GZPISE;
- }
- else
- err(3, "input not a zip or gzip file");
-
- /* if entry encrypted, decrypt and validate encryption header */
- if (decrypt)
- #ifdef CRYPT
- {
- ush i, e;
-
- if (p == NULL)
- if ((p = (char *)malloc(PWLEN+1)) == NULL)
- err(1, "out of memory");
- else if ((p = getp("Enter password: ", p, PWLEN+1)) == NULL)
- err(1, "no tty to prompt for password");
- init_keys(p);
- for (i = 0; i < RAND_HEAD_LEN; i++)
- ReadByte(&e);
- /* if (e != (h[LOCFLG] & EXTFLG ? SH(h + LOCTIM) : SH(h + LOCCRC + 2))) */
- if (e != (ush)(h[LOCFLG] & EXTFLG ? h[LOCTIM + 1] : h[LOCCRC + 3]))
- err(3, "incorrect password for first entry");
- }
- #else /* !CRYPT */
- err(3, "cannot decrypt entry (need to recompile with full crypt.c)");
- #endif /* ?CRYPT */
-
- /* prepare output buffer and crc */
- outptr = outbuf;
- outcnt = 0;
- outsiz = 0L;
- updcrc(NULL, 0);
-
- /* decompress */
- if (g || h[LOCHOW])
- { /* deflated entry */
- int r;
-
- if ((r = inflate()) != 0)
- if (r == 3)
- err(1, "out of memory");
- else
- err(4, "invalid compressed data--format violated");
- }
- else
- { /* stored entry */
- register ulg n;
-
- n = LG(h + LOCLEN);
- if (n != LG(h + LOCSIZ) - (decrypt ? RAND_HEAD_LEN : 0)) {
- fprintf(stderr, "len %ld, siz %ld\n", n, LG(h + LOCSIZ));
- err(4, "invalid compressed data--length mismatch");
- }
- while (n--) {
- ush c = getc(in);
- #ifdef CRYPT
- if (decrypt)
- zdecode(c);
- #endif
- OUTB(c);
- }
- }
- FlushOutput();
- fflush(out);
-
- /* if extended header, get it */
- if (g)
- {
- if (fread((char *)h + LOCCRC, 1, 8, in) != 8)
- err(3, "gzip file ended prematurely");
- }
- else
- if ((h[LOCFLG] & EXTFLG) &&
- fread((char *)h + LOCCRC - 4, 1, EXTHDR, in) != EXTHDR)
- err(3, "zip file ended prematurely");
-
- /* validate decompression */
- if (LG(h + LOCCRC) != updcrc(outbuf, 0))
- err(4, "invalid compressed data--crc error");
- if (LG(h + (g ? LOCSIZ : LOCLEN)) != outsiz)
- err(4, "invalid compressed data--length error");
-
- /* check if there are more entries */
- if (!g && fread((char *)h, 1, 4, in) == 4 && LG(h) == LOCSIG)
- fprintf(stderr,
- "funzip warning: zip file has more than one entry--rest ignored\n");
-
- exit(0);
- }
-