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Annotation of coherent/b/bin/unzip/funzip.c, revision 1.1

1.1     ! root        1: /* funzip.c -- Not copyrighted 1992 by Mark Adler */
        !             2: 
        !             3: #define VERSION "1.3p1 of 10 January 1993"
        !             4: 
        !             5: 
        !             6: /* You can do whatever you like with this source file, though I would
        !             7:    prefer that if you modify it and redistribute it that you include
        !             8:    comments to that effect with your name and the date.  Thank you.
        !             9: 
        !            10:    History:
        !            11:    vers    date          who           what
        !            12:    ----  ---------  --------------  ------------------------------------
        !            13:     1.0  13 Aug 92  M. Adler        really simple unzip filter.
        !            14:     1.1  13 Aug 92  M. Adler        cleaned up somewhat, give help if
        !            15:                                     stdin not redirected, warn if more
        !            16:                                     zip file entries after the first.
        !            17:     1.2  15 Aug 92  M. Adler        added check of lengths for stored
        !            18:                                     entries, added more help.
        !            19:     1.3  16 Aug 92  M. Adler        removed redundant #define's, added
        !            20:                                     decryption.
        !            21:    1.3p1 10 Jan 93  G. Roelofs      incorporated fixes from 2.2 beta:
        !            22:            [1.4]    G. Roelofs        added exit(0).
        !            23:            [1.5]    K. U. Rommel      changed read/write modes for OS/2.
        !            24:            [1.7]    G. Roelofs        changed to use DOS_OS2.
        !            25:            [1.8]    M. Adler          improved inflation error msgs.
        !            26:            [1.9]    G. Roelofs        changed ULONG/UWORD/byte to ulg/ush/uch;
        !            27:                                       renamed inflate_entry() to inflate().
        !            28:            [2.1]    J. Gailly         fixed crypt/store bug,
        !            29:                     G. Roelofs        fixed decryption check (single byte).
        !            30:  */
        !            31: 
        !            32: 
        !            33: /*
        !            34: 
        !            35:    All funzip does is take a zip file from stdin and decompress the
        !            36:    first entry to stdout.  The entry has to be either deflated or
        !            37:    stored.  If the entry is encrypted, then the decryption password
        !            38:    must be supplied on the command line as the first argument.
        !            39: 
        !            40:    funzip needs to be linked with inflate.o compiled from the unzip
        !            41:    source.  If decryption is desired, then it needs to be compiled
        !            42:    with -DCRYPT and linked also with crypt.o.
        !            43: 
        !            44:  */
        !            45: 
        !            46: #include "unzip.h"
        !            47: 
        !            48: /* enforce binary i/o if recognized */
        !            49: #if defined(__STDC__) || defined(DOS_OS2)
        !            50: #  define BINIO
        !            51: #endif
        !            52: 
        !            53: #ifdef BINIO
        !            54: #  define FOPR "rb"
        !            55: #  define FOPW "wb"
        !            56: #else
        !            57: #  define FOPR "r"
        !            58: #  define FOPW "w"
        !            59: #endif
        !            60: 
        !            61: /* PKZIP header definitions */
        !            62: #define LOCSIG 0x04034b50L      /* four byte lead-in (lsb first) */
        !            63: #define LOCFLG 6                /* offset of bit flag */
        !            64: #define  CRPFLG 1               /*  bit for encrypted entry */
        !            65: #define  EXTFLG 8               /*  bit for extended local header */
        !            66: #define LOCHOW 8                /* offset of compression method */
        !            67: #define LOCTIM 10               /* file mod time (for decryption) */
        !            68: #define LOCCRC 14               /* offset of crc */
        !            69: #define LOCSIZ 18               /* offset of compressed size */
        !            70: #define LOCLEN 22               /* offset of uncompressed length */
        !            71: #define LOCFIL 26               /* offset of file name field length */
        !            72: #define LOCEXT 28               /* offset of extra field length */
        !            73: #define LOCHDR 30               /* size of local header, including sig */
        !            74: #define EXTHDR 16               /* size of extended local header, inc sig */
        !            75: 
        !            76: #define RAND_HEAD_LEN 12        /* length of encryption header */
        !            77: 
        !            78: /* Macros for getting two byte and four byte header values */
        !            79: #define SH(p) ((UWORD)(byte)((p)[0]) | ((UWORD)(byte)((p)[1]) << 8))
        !            80: #define LG(p) ((ULONG)(SH(p)) | ((ULONG)(SH((p)+2)) << 16))
        !            81: 
        !            82: /* Function prototypes */
        !            83: ULONG updcrc OF((byte *, int));
        !            84: int inflate OF((void));
        !            85: void err OF((int, char *));
        !            86: void main OF((int, char **));
        !            87: 
        !            88: /* Globals */
        !            89: FILE *in, *out;                 /* input and output files */
        !            90: union work area;                /* inflate sliding window */
        !            91: byte *outbuf;                   /* malloc'ed output buffer */
        !            92: byte *outptr;                   /* points to next byte in output buffer */
        !            93: int outcnt;                     /* bytes in output buffer */
        !            94: ULONG outsiz;                   /* total bytes written to out */
        !            95: int decrypt;                    /* flag to turn on decryption */
        !            96: char *key;                      /* not used--needed to link crypt.c */
        !            97: 
        !            98: /* Masks for inflate.c */
        !            99: UWORD mask_bits[] = {
        !           100:     0x0000,
        !           101:     0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
        !           102:     0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
        !           103: };
        !           104: 
        !           105: 
        !           106: /* Table of CRC-32's of all single byte values (made by makecrc.c) */
        !           107: ULONG crc_32_tab[] = {
        !           108:   0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
        !           109:   0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
        !           110:   0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
        !           111:   0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
        !           112:   0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
        !           113:   0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
        !           114:   0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
        !           115:   0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
        !           116:   0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
        !           117:   0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
        !           118:   0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
        !           119:   0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
        !           120:   0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
        !           121:   0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
        !           122:   0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
        !           123:   0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
        !           124:   0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
        !           125:   0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
        !           126:   0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
        !           127:   0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
        !           128:   0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
        !           129:   0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
        !           130:   0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
        !           131:   0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
        !           132:   0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
        !           133:   0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
        !           134:   0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
        !           135:   0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
        !           136:   0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
        !           137:   0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
        !           138:   0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
        !           139:   0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
        !           140:   0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
        !           141:   0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
        !           142:   0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
        !           143:   0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
        !           144:   0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
        !           145:   0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
        !           146:   0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
        !           147:   0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
        !           148:   0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
        !           149:   0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
        !           150:   0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
        !           151:   0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
        !           152:   0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
        !           153:   0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
        !           154:   0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
        !           155:   0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
        !           156:   0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
        !           157:   0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
        !           158:   0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
        !           159:   0x2d02ef8dL
        !           160: };
        !           161: 
        !           162: 
        !           163: ULONG updcrc(s, n)
        !           164: byte *s;                /* pointer to bytes to pump through */
        !           165: int n;                  /* number of bytes in s[] */
        !           166: /* Run a set of bytes through the crc shift register.  If s is a NULL
        !           167:    pointer, then initialize the crc shift register contents instead.
        !           168:    Return the current crc in either case. */
        !           169: {
        !           170:   register ULONG c;       /* temporary variable */
        !           171: 
        !           172:   static ULONG crc = 0xffffffffL; /* shift register contents */
        !           173: 
        !           174:   if (s == NULL)
        !           175:     c = 0xffffffffL;
        !           176:   else
        !           177:   {
        !           178:     c = crc;
        !           179:     while (n--)
        !           180:       c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
        !           181:   }
        !           182:   crc = c;
        !           183:   return c ^ 0xffffffffL;       /* (instead of ~c for 64-bit machines) */
        !           184: }
        !           185: 
        !           186: 
        !           187: void err(n, m)
        !           188: int n;
        !           189: char *m;
        !           190: /* Exit on error with a message and a code */
        !           191: {
        !           192:   fprintf(stderr, "funzip error: %s\n", m);
        !           193:   exit(n);
        !           194: }
        !           195: 
        !           196: 
        !           197: int ReadByte(b)
        !           198: UWORD *b;
        !           199: /* Used by inflate.c to get a byte (archaism from unzip) */
        !           200: {
        !           201:   register int c = getc(in);
        !           202: 
        !           203:   if (c == EOF)
        !           204:     return 0;
        !           205: #ifdef CRYPT
        !           206:   if (decrypt)
        !           207:     update_keys(c ^= decrypt_byte());
        !           208: #endif /* CRYPT */
        !           209:   *b = (UWORD)c;
        !           210:   return 8;
        !           211: }
        !           212: 
        !           213: 
        !           214: int FlushOutput()
        !           215: /* Empty output buffer */
        !           216: {
        !           217:   if (outcnt)
        !           218:   {
        !           219:     updcrc(outbuf, outcnt);
        !           220:     if (fwrite((char *)outbuf, 1,outcnt,out) != outcnt)
        !           221:       err(9, "out of space on stdout");
        !           222:     outsiz += outcnt;
        !           223:     outptr = outbuf;
        !           224:     outcnt = 0;
        !           225:   }
        !           226:   return 0;
        !           227: }
        !           228: 
        !           229: 
        !           230: void main(argc, argv)
        !           231: int argc;
        !           232: char **argv;
        !           233: /* Given a zip file on stdin, decompress the first entry to stdout. */
        !           234: {
        !           235:   byte h[LOCHDR];               /* first local header */
        !           236: 
        !           237:   /* if stdin not redirected, give the user help */
        !           238:   if (isatty(0))
        !           239:   {
        !           240:     fprintf(stderr, "FUnZip (Filter UnZip), version %s\n%s", VERSION,
        !           241: #ifdef CRYPT
        !           242:       "usage: funzip [password] < infile.zip > outfile\n");
        !           243: #else /* !CRYPT */
        !           244:       "usage: funzip < infile.zip > outfile\n");
        !           245: #endif /* ?CRYPT */
        !           246:     fprintf(stderr,
        !           247:       "       extracts to stdout the first zip entry of stdin.\n");
        !           248:     exit(3);
        !           249:   }
        !           250: 
        !           251:   /* prepare to be a binary filter */
        !           252:   if ((outbuf = (byte *)malloc(OUTBUFSIZ)) == NULL)
        !           253:     err(1, "out of memory");
        !           254: #ifdef DOS_OS2
        !           255:   setmode(0, O_BINARY); /* some buggy C libraries require BOTH :-( the  */
        !           256: #endif                  /*  setmode() call AND the fdopen() in binary mode */
        !           257:   if ((in = fdopen(0, FOPR)) == NULL)
        !           258:     err(2, "cannot find stdin");
        !           259: #ifdef DOS_OS2
        !           260:   setmode(1, O_BINARY);
        !           261: #endif
        !           262:   if ((out = fdopen(1, FOPW)) == NULL)
        !           263:     err(2, "cannot write to stdout");
        !           264: 
        !           265:   /* read local header, check validity, and skip name and extra fields */
        !           266:   if (fread((char *)h, 1, LOCHDR, in) != LOCHDR || LG(h) != LOCSIG)
        !           267:     err(3, "input not a zip file or empty");
        !           268:   if (SH(h + LOCHOW) != STORED && SH(h + LOCHOW) != DEFLATED)
        !           269:     err(3, "first entry not deflated or stored--can't funzip");
        !           270:   fseek(in, (long)(SH(h + LOCFIL)) + (long)(SH(h + LOCEXT)), 1);
        !           271: 
        !           272:   /* if entry encrypted, decrypt and validate encryption header */
        !           273:   if ((decrypt = h[LOCFLG] & CRPFLG) != 0)
        !           274: #ifdef CRYPT
        !           275:   {
        !           276:     UWORD i, e;
        !           277: 
        !           278:     if (argc < 2)
        !           279:       err(3, "need password on command line for encrypted entry");
        !           280:     init_keys(argv[1]);
        !           281:     for (i = 0; i < RAND_HEAD_LEN; i++)
        !           282:       ReadByte(&e);
        !           283:     if (e != (ush)(h[LOCFLG] & EXTFLG ? h[LOCTIM + 1] : h[LOCCRC + 3]))
        !           284:       err(3, "incorrect password for first entry");
        !           285:   }
        !           286: #else /* !CRYPT */
        !           287:     err(3, "cannot decrypt entry (need to recompile funzip with crypt.c)");
        !           288: #endif /* ?CRYPT */
        !           289: 
        !           290:   /* prepare output buffer and crc */
        !           291:   outptr = outbuf;
        !           292:   outcnt = 0;
        !           293:   outsiz = 0L;
        !           294:   updcrc(NULL, 0);
        !           295: 
        !           296:   /* decompress */
        !           297:   if (h[LOCHOW])
        !           298:   {                             /* deflated entry */
        !           299:     int r;
        !           300:  
        !           301:     if ((r = inflate()) != 0)
        !           302:       if (r == 3)
        !           303:         err(1, "out of memory");
        !           304:       else
        !           305:         err(4, "invalid compressed data--format violated");
        !           306:   }
        !           307:   else
        !           308:   {                             /* stored entry */
        !           309:     register ULONG n;
        !           310: 
        !           311:     n = LG(h + LOCLEN);
        !           312:     if (n != LG(h + LOCSIZ) - (decrypt ? RAND_HEAD_LEN : 0)) {
        !           313:       fprintf(stderr, "len %ld, siz %ld\n", n, LG(h + LOCSIZ));
        !           314:       err(4, "invalid compressed data--length mismatch");
        !           315:   }
        !           316:     while (n--) {
        !           317:       ush c = getc(in);
        !           318: #ifdef CRYPT
        !           319:       if (decrypt)
        !           320:         update_keys(c ^= decrypt_byte());
        !           321: #endif
        !           322:       OUTB(c);
        !           323:     }
        !           324:   }
        !           325:   FlushOutput();
        !           326:   fflush(out);
        !           327: 
        !           328:   /* if extended header, get it */
        !           329:   if ((h[LOCFLG] & EXTFLG) &&
        !           330:       fread((char *)h + LOCCRC - 4, 1, EXTHDR, in) != EXTHDR)
        !           331:     err(3, "zip file ended prematurely");
        !           332: 
        !           333:   /* validate decompression */
        !           334:   if (LG(h + LOCCRC) != updcrc(outbuf, 0))
        !           335:     err(4, "invalid compressed data--crc error");
        !           336:   if (LG(h + LOCLEN) != outsiz)
        !           337:     err(4, "invalid compressed data--length error");
        !           338: 
        !           339:   /* check if there are more entries */
        !           340:   if (fread((char *)h, 1, 4, in) == 4 && LG(h) == LOCSIG)
        !           341:     fprintf(stderr,
        !           342:       "funzip warning: zip file has more than one entry--rest ignored\n");
        !           343: 
        !           344:   exit(0);
        !           345: }

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