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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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