/* funzip.c -- Not copyrighted 1992 by Mark Adler */ #define VERSION "2.1 of 23 October 1992" /* 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 file name 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. */ /* 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 LOCSIG 0x04034b50L /* four-byte lead-in (lsb first) */ #define LOCFLG 6 /* offset of bit flag */ #define CRPFLG 1 /* bit for encrypted entry */ #define EXTFLG 8 /* bit for extended local header */ #define LOCHOW 8 /* offset of compression method */ #define LOCTIM 10 /* file mod time (for decryption) */ #define LOCCRC 14 /* offset of crc */ #define LOCSIZ 18 /* offset of compressed size */ #define LOCLEN 22 /* offset of uncompressed length */ #define LOCFIL 26 /* offset of file name field length */ #define LOCEXT 28 /* offset of extra field length */ #define LOCHDR 30 /* size of local header, including sig */ #define EXTHDR 16 /* size of extended local header, inc sig */ /* 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 */ char *key; /* not used--needed to link crypt.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. */ { uch h[LOCHDR]; /* first local header */ #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, " extracts to stdout the 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 */ if (fread((char *)h, 1, LOCHDR, in) != LOCHDR || LG(h) != LOCSIG) err(3, "input not a zip file or empty"); if (SH(h + LOCHOW) != STORED && SH(h + LOCHOW) != DEFLATED) err(3, "first entry not deflated or stored--can't funzip"); fseek(in, (long)(SH(h + LOCFIL)) + (long)(SH(h + LOCEXT)), 1); /* if entry encrypted, decrypt and validate encryption header */ if ((decrypt = h[LOCFLG] & CRPFLG) != 0) #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 (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 ((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 + LOCLEN) != outsiz) err(4, "invalid compressed data--length error"); /* check if there are more entries */ if (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); }