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Diffstat (limited to 'src/libbb/unzip.c')
| -rw-r--r-- | src/libbb/unzip.c | 1021 |
1 files changed, 0 insertions, 1021 deletions
diff --git a/src/libbb/unzip.c b/src/libbb/unzip.c deleted file mode 100644 index 435effb..0000000 --- a/src/libbb/unzip.c +++ /dev/null @@ -1,1021 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * gunzip implementation for busybox - * - * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly. - * - * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de> - * based on gzip sources - * - * Adjusted further by Erik Andersen <andersee@debian.org> to support - * files as well as stdin/stdout, and to generally behave itself wrt - * command line handling. - * - * General cleanup to better adhere to the style guide and make use of - * standard busybox functions by Glenn McGrath <bug1@optushome.com.au> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * - * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface - * Copyright (C) 1992-1993 Jean-loup Gailly - * The unzip code was written and put in the public domain by Mark Adler. - * Portions of the lzw code are derived from the public domain 'compress' - * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies, - * Ken Turkowski, Dave Mack and Peter Jannesen. - * - * See the license_msg below and the file COPYING for the software license. - * See the file algorithm.doc for the compression algorithms and file formats. - */ - -#include <sys/types.h> -#include <sys/wait.h> -#include <signal.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <errno.h> -#include "libbb.h" - -static FILE *in_file, *out_file; - -static unsigned char *window; -static unsigned long *crc_table = NULL; - -static unsigned long crc; /* shift register contents */ - -/* - * window size--must be a power of two, and - * at least 32K for zip's deflate method - */ -static const int WSIZE = 0x8000; - -/* If BMAX needs to be larger than 16, then h and x[] should be ulg. */ -static const int BMAX = 16; /* maximum bit length of any code (16 for explode) */ -static const int N_MAX = 288; /* maximum number of codes in any set */ - -static long bytes_out; /* number of output bytes */ -static unsigned long outcnt; /* bytes in output buffer */ - -static unsigned hufts; /* track memory usage */ -static unsigned long bb; /* bit buffer */ -static unsigned bk; /* bits in bit buffer */ - -typedef struct huft_s { - unsigned char e; /* number of extra bits or operation */ - unsigned char b; /* number of bits in this code or subcode */ - union { - unsigned short n; /* literal, length base, or distance base */ - struct huft_s *t; /* pointer to next level of table */ - } v; -} huft_t; - -static const unsigned short mask_bits[] = { - 0x0000, - 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, - 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff -}; - -//static int error_number = 0; -/* ======================================================================== - * Signal and error handler. - */ - -static void abort_gzip() -{ - error_msg("gzip aborted\n"); - _exit(-1); -} - -static void make_crc_table() -{ - unsigned long table_entry; /* crc shift register */ - unsigned long poly = 0; /* polynomial exclusive-or pattern */ - int i; /* counter for all possible eight bit values */ - int k; /* byte being shifted into crc apparatus */ - - /* terms of polynomial defining this crc (except x^32): */ - static int p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26}; - - /* initial shift register value */ - crc = 0xffffffffL; - crc_table = (unsigned long *) xmalloc(256 * sizeof(unsigned long)); - - /* Make exclusive-or pattern from polynomial (0xedb88320) */ - for (i = 0; i < sizeof(p)/sizeof(int); i++) - poly |= 1L << (31 - p[i]); - - /* Compute and print table of CRC's, five per line */ - for (i = 0; i < 256; i++) { - table_entry = i; - /* The idea to initialize the register with the byte instead of - * zero was stolen from Haruhiko Okumura's ar002 - */ - for (k = 8; k; k--) { - table_entry = table_entry & 1 ? (table_entry >> 1) ^ poly : table_entry >> 1; - } - crc_table[i]=table_entry; - } -} - -/* =========================================================================== - * Write the output window window[0..outcnt-1] and update crc and bytes_out. - * (Used for the decompressed data only.) - */ -static void flush_window(void) -{ - int n; - - if (outcnt == 0) - return; - - for (n = 0; n < outcnt; n++) { - crc = crc_table[((int) crc ^ (window[n])) & 0xff] ^ (crc >> 8); - } - - if (fwrite(window, 1, outcnt, out_file) != outcnt) { - /* - * The Parent process may not be interested in all the data we have, - * in which case it will rudely close its end of the pipe and - * wait for us to exit. - */ - if (errno == EPIPE) - _exit(EXIT_SUCCESS); - - error_msg("Couldnt write"); - _exit(EXIT_FAILURE); - } - bytes_out += (unsigned long) outcnt; - outcnt = 0; -} - -/* - * Free the malloc'ed tables built by huft_build(), which makes a linked - * list of the tables it made, with the links in a dummy first entry of - * each table. - * t: table to free - */ -static int huft_free(huft_t *t) -{ - huft_t *p, *q; - - /* Go through linked list, freeing from the malloced (t[-1]) address. */ - p = t; - while (p != (huft_t *) NULL) { - q = (--p)->v.t; - free((char *) p); - p = q; - } - return 0; -} - -/* Given a list of code lengths and a maximum table size, make a set of - * tables to decode that set of codes. Return zero on success, one if - * the given code set is incomplete (the tables are still built in this - * case), two if the input is invalid (all zero length codes or an - * oversubscribed set of lengths), and three if not enough memory. - * - * b: code lengths in bits (all assumed <= BMAX) - * n: number of codes (assumed <= N_MAX) - * s: number of simple-valued codes (0..s-1) - * d: list of base values for non-simple codes - * e: list of extra bits for non-simple codes - * t: result: starting table - * m: maximum lookup bits, returns actual - */ -static int huft_build(unsigned int *b, const unsigned int n, const unsigned int s, - const unsigned short *d, const unsigned short *e, huft_t **t, int *m) -{ - unsigned a; /* counter for codes of length k */ - unsigned c[BMAX + 1]; /* bit length count table */ - unsigned f; /* i repeats in table every f entries */ - int g; /* maximum code length */ - int h; /* table level */ - unsigned i; /* counter, current code */ - unsigned j; /* counter */ - int k; /* number of bits in current code */ - int l; /* bits per table (returned in m) */ - unsigned *p; /* pointer into c[], b[], or v[] */ - huft_t *q; /* points to current table */ - huft_t r; /* table entry for structure assignment */ - huft_t *u[BMAX]; /* table stack */ - unsigned v[N_MAX]; /* values in order of bit length */ - int w; /* bits before this table == (l * h) */ - unsigned x[BMAX + 1]; /* bit offsets, then code stack */ - unsigned *xp; /* pointer into x */ - int y; /* number of dummy codes added */ - unsigned z; /* number of entries in current table */ - - /* Generate counts for each bit length */ - memset ((void *)(c), 0, sizeof(c)); - p = b; - i = n; - do { - c[*p]++; /* assume all entries <= BMAX */ - p++; /* Can't combine with above line (Solaris bug) */ - } while (--i); - if (c[0] == n) { /* null input--all zero length codes */ - *t = (huft_t *) NULL; - *m = 0; - return 0; - } - - /* Find minimum and maximum length, bound *m by those */ - l = *m; - for (j = 1; j <= BMAX; j++) - if (c[j]) - break; - k = j; /* minimum code length */ - if ((unsigned) l < j) - l = j; - for (i = BMAX; i; i--) - if (c[i]) - break; - g = i; /* maximum code length */ - if ((unsigned) l > i) - l = i; - *m = l; - - /* Adjust last length count to fill out codes, if needed */ - for (y = 1 << j; j < i; j++, y <<= 1) - if ((y -= c[j]) < 0) - return 2; /* bad input: more codes than bits */ - if ((y -= c[i]) < 0) - return 2; - c[i] += y; - - /* Generate starting offsets into the value table for each length */ - x[1] = j = 0; - p = c + 1; - xp = x + 2; - while (--i) { /* note that i == g from above */ - *xp++ = (j += *p++); - } - - /* Make a table of values in order of bit lengths */ - p = b; - i = 0; - do { - if ((j = *p++) != 0) - v[x[j]++] = i; - } while (++i < n); - - /* Generate the Huffman codes and for each, make the table entries */ - x[0] = i = 0; /* first Huffman code is zero */ - p = v; /* grab values in bit order */ - h = -1; /* no tables yet--level -1 */ - w = -l; /* bits decoded == (l * h) */ - u[0] = (huft_t *) NULL; /* just to keep compilers happy */ - q = (huft_t *) NULL; /* ditto */ - z = 0; /* ditto */ - - /* go through the bit lengths (k already is bits in shortest code) */ - for (; k <= g; k++) { - a = c[k]; - while (a--) { - /* here i is the Huffman code of length k bits for value *p */ - /* make tables up to required level */ - while (k > w + l) { - h++; - w += l; /* previous table always l bits */ - - /* compute minimum size table less than or equal to l bits */ - z = (z = g - w) > (unsigned) l ? l : z; /* upper limit on table size */ - if ((f = 1 << (j = k - w)) > a + 1) { /* try a k-w bit table *//* too few codes for k-w bit table */ - f -= a + 1; /* deduct codes from patterns left */ - xp = c + k; - while (++j < z) { /* try smaller tables up to z bits */ - if ((f <<= 1) <= *++xp) - break; /* enough codes to use up j bits */ - f -= *xp; /* else deduct codes from patterns */ - } - } - z = 1 << j; /* table entries for j-bit table */ - - /* allocate and link in new table */ - if ((q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t))) == NULL) { - if (h) { - huft_free(u[0]); - } - return 3; /* not enough memory */ - } - hufts += z + 1; /* track memory usage */ - *t = q + 1; /* link to list for huft_free() */ - *(t = &(q->v.t)) = NULL; - u[h] = ++q; /* table starts after link */ - - /* connect to last table, if there is one */ - if (h) { - x[h] = i; /* save pattern for backing up */ - r.b = (unsigned char) l; /* bits to dump before this table */ - r.e = (unsigned char) (16 + j); /* bits in this table */ - r.v.t = q; /* pointer to this table */ - j = i >> (w - l); /* (get around Turbo C bug) */ - u[h - 1][j] = r; /* connect to last table */ - } - } - - /* set up table entry in r */ - r.b = (unsigned char) (k - w); - if (p >= v + n) - r.e = 99; /* out of values--invalid code */ - else if (*p < s) { - r.e = (unsigned char) (*p < 256 ? 16 : 15); /* 256 is end-of-block code */ - r.v.n = (unsigned short) (*p); /* simple code is just the value */ - p++; /* one compiler does not like *p++ */ - } else { - r.e = (unsigned char) e[*p - s]; /* non-simple--look up in lists */ - r.v.n = d[*p++ - s]; - } - - /* fill code-like entries with r */ - f = 1 << (k - w); - for (j = i >> w; j < z; j += f) - q[j] = r; - - /* backwards increment the k-bit code i */ - for (j = 1 << (k - 1); i & j; j >>= 1) - i ^= j; - i ^= j; - - /* backup over finished tables */ - while ((i & ((1 << w) - 1)) != x[h]) { - h--; /* don't need to update q */ - w -= l; - } - } - } - /* Return true (1) if we were given an incomplete table */ - return y != 0 && g != 1; -} - -/* - * inflate (decompress) the codes in a deflated (compressed) block. - * Return an error code or zero if it all goes ok. - * - * tl, td: literal/length and distance decoder tables - * bl, bd: number of bits decoded by tl[] and td[] - */ -static int inflate_codes(huft_t *tl, huft_t *td, int bl, int bd) -{ - unsigned long e; /* table entry flag/number of extra bits */ - unsigned long n, d; /* length and index for copy */ - unsigned long w; /* current window position */ - huft_t *t; /* pointer to table entry */ - unsigned ml, md; /* masks for bl and bd bits */ - unsigned long b; /* bit buffer */ - unsigned k; /* number of bits in bit buffer */ - - /* make local copies of globals */ - b = bb; /* initialize bit buffer */ - k = bk; - w = outcnt; /* initialize window position */ - - /* inflate the coded data */ - ml = mask_bits[bl]; /* precompute masks for speed */ - md = mask_bits[bd]; - for (;;) { /* do until end of block */ - while (k < (unsigned) bl) { - b |= ((unsigned long)fgetc(in_file)) << k; - k += 8; - } - if ((e = (t = tl + ((unsigned) b & ml))->e) > 16) - do { - if (e == 99) { - return 1; - } - b >>= t->b; - k -= t->b; - e -= 16; - while (k < e) { - b |= ((unsigned long)fgetc(in_file)) << k; - k += 8; - } - } while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e) > 16); - b >>= t->b; - k -= t->b; - if (e == 16) { /* then it's a literal */ - window[w++] = (unsigned char) t->v.n; - if (w == WSIZE) { - outcnt=(w), - flush_window(); - w = 0; - } - } else { /* it's an EOB or a length */ - - /* exit if end of block */ - if (e == 15) { - break; - } - - /* get length of block to copy */ - while (k < e) { - b |= ((unsigned long)fgetc(in_file)) << k; - k += 8; - } - n = t->v.n + ((unsigned) b & mask_bits[e]); - b >>= e; - k -= e; - - /* decode distance of block to copy */ - while (k < (unsigned) bd) { - b |= ((unsigned long)fgetc(in_file)) << k; - k += 8; - } - - if ((e = (t = td + ((unsigned) b & md))->e) > 16) - do { - if (e == 99) - return 1; - b >>= t->b; - k -= t->b; - e -= 16; - while (k < e) { - b |= ((unsigned long)fgetc(in_file)) << k; - k += 8; - } - } while ((e = (t = t->v.t + ((unsigned) b & mask_bits[e]))->e) > 16); - b >>= t->b; - k -= t->b; - while (k < e) { - b |= ((unsigned long)fgetc(in_file)) << k; - k += 8; - } - d = w - t->v.n - ((unsigned) b & mask_bits[e]); - b >>= e; - k -= e; - - /* do the copy */ - do { - n -= (e = (e = WSIZE - ((d &= WSIZE - 1) > w ? d : w)) > n ? n : e); -#if !defined(NOMEMCPY) && !defined(DEBUG) - if (w - d >= e) { /* (this test assumes unsigned comparison) */ - memcpy(window + w, window + d, e); - w += e; - d += e; - } else /* do it slow to avoid memcpy() overlap */ -#endif /* !NOMEMCPY */ - do { - window[w++] = window[d++]; - } while (--e); - if (w == WSIZE) { - outcnt=(w), - flush_window(); - w = 0; - } - } while (n); - } - } - - /* restore the globals from the locals */ - outcnt = w; /* restore global window pointer */ - bb = b; /* restore global bit buffer */ - bk = k; - - /* done */ - return 0; -} - -/* - * decompress an inflated block - * e: last block flag - * - * GLOBAL VARIABLES: bb, kk, - */ -static int inflate_block(int *e) -{ - unsigned t; /* block type */ - unsigned long b; /* bit buffer */ - unsigned k; /* number of bits in bit buffer */ - static unsigned short cplens[] = { /* Copy lengths for literal codes 257..285 */ - 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, - 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0 - }; - /* note: see note #13 above about the 258 in this list. */ - static unsigned short cplext[] = { /* Extra bits for literal codes 257..285 */ - 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, - 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99 - }; /* 99==invalid */ - static unsigned short cpdist[] = { /* Copy offsets for distance codes 0..29 */ - 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, - 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, - 8193, 12289, 16385, 24577 - }; - static unsigned short cpdext[] = { /* Extra bits for distance codes */ - 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, - 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, - 12, 12, 13, 13 - }; - - /* make local bit buffer */ - b = bb; - k = bk; - - /* read in last block bit */ - while (k < 1) { - b |= ((unsigned long)fgetc(in_file)) << k; - k += 8; - } - *e = (int) b & 1; - b >>= 1; - k -= 1; - - /* read in block type */ - while (k < 2) { - b |= ((unsigned long)fgetc(in_file)) << k; - k += 8; - } - t = (unsigned) b & 3; - b >>= 2; - k -= 2; - - /* restore the global bit buffer */ - bb = b; - bk = k; - - /* inflate that block type */ - switch (t) { - case 0: /* Inflate stored */ - { - unsigned long n; /* number of bytes in block */ - unsigned long w; /* current window position */ - unsigned long b_stored; /* bit buffer */ - unsigned long k_stored; /* number of bits in bit buffer */ - - /* make local copies of globals */ - b_stored = bb; /* initialize bit buffer */ - k_stored = bk; - w = outcnt; /* initialize window position */ - - /* go to byte boundary */ - n = k_stored & 7; - b_stored >>= n; - k_stored -= n; - - /* get the length and its complement */ - while (k_stored < 16) { - b_stored |= ((unsigned long)fgetc(in_file)) << k_stored; - k_stored += 8; - } - n = ((unsigned) b_stored & 0xffff); - b_stored >>= 16; - k_stored -= 16; - while (k_stored < 16) { - b_stored |= ((unsigned long)fgetc(in_file)) << k_stored; - k_stored += 8; - } - if (n != (unsigned) ((~b_stored) & 0xffff)) { - return 1; /* error in compressed data */ - } - b_stored >>= 16; - k_stored -= 16; - - /* read and output the compressed data */ - while (n--) { - while (k_stored < 8) { - b_stored |= ((unsigned long)fgetc(in_file)) << k_stored; - k_stored += 8; - } - window[w++] = (unsigned char) b_stored; - if (w == (unsigned long)WSIZE) { - outcnt=(w), - flush_window(); - w = 0; - } - b_stored >>= 8; - k_stored -= 8; - } - - /* restore the globals from the locals */ - outcnt = w; /* restore global window pointer */ - bb = b_stored; /* restore global bit buffer */ - bk = k_stored; - return 0; - } - case 1: /* Inflate fixed - * decompress an inflated type 1 (fixed Huffman codes) block. We should - * either replace this with a custom decoder, or at least precompute the - * Huffman tables. - */ - { - int i; /* temporary variable */ - huft_t *tl; /* literal/length code table */ - huft_t *td; /* distance code table */ - int bl; /* lookup bits for tl */ - int bd; /* lookup bits for td */ - unsigned int l[288]; /* length list for huft_build */ - - /* set up literal table */ - for (i = 0; i < 144; i++) { - l[i] = 8; - } - for (; i < 256; i++) { - l[i] = 9; - } - for (; i < 280; i++) { - l[i] = 7; - } - for (; i < 288; i++) { /* make a complete, but wrong code set */ - l[i] = 8; - } - bl = 7; - if ((i = huft_build(l, 288, 257, cplens, cplext, &tl, &bl)) != 0) { - return i; - } - - /* set up distance table */ - for (i = 0; i < 30; i++) { /* make an incomplete code set */ - l[i] = 5; - } - bd = 5; - if ((i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd)) > 1) { - huft_free(tl); - return i; - } - - /* decompress until an end-of-block code */ - if (inflate_codes(tl, td, bl, bd)) { - huft_free(tl); - huft_free(td); - return 1; - } - - /* free the decoding tables, return */ - huft_free(tl); - huft_free(td); - return 0; - } - case 2: /* Inflate dynamic */ - { - /* Tables for deflate from PKZIP's appnote.txt. */ - static unsigned border[] = { /* Order of the bit length code lengths */ - 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 - }; - int dbits = 6; /* bits in base distance lookup table */ - int lbits = 9; /* bits in base literal/length lookup table */ - - int i; /* temporary variables */ - unsigned j; - unsigned l; /* last length */ - unsigned m; /* mask for bit lengths table */ - unsigned n; /* number of lengths to get */ - huft_t *tl; /* literal/length code table */ - huft_t *td; /* distance code table */ - int bl; /* lookup bits for tl */ - int bd; /* lookup bits for td */ - unsigned nb; /* number of bit length codes */ - unsigned nl; /* number of literal/length codes */ - unsigned nd; /* number of distance codes */ - - unsigned ll[286 + 30]; /* literal/length and distance code lengths */ - unsigned long b_dynamic; /* bit buffer */ - unsigned k_dynamic; /* number of bits in bit buffer */ - - /* make local bit buffer */ - b_dynamic = bb; - k_dynamic = bk; - - /* read in table lengths */ - while (k_dynamic < 5) { - b_dynamic |= ((unsigned long)fgetc(in_file)) << k_dynamic; - k_dynamic += 8; - } - nl = 257 + ((unsigned) b_dynamic & 0x1f); /* number of literal/length codes */ - b_dynamic >>= 5; - k_dynamic -= 5; - while (k_dynamic < 5) { - b_dynamic |= ((unsigned long)fgetc(in_file)) << k_dynamic; - k_dynamic += 8; - } - nd = 1 + ((unsigned) b_dynamic & 0x1f); /* number of distance codes */ - b_dynamic >>= 5; - k_dynamic -= 5; - while (k_dynamic < 4) { - b_dynamic |= ((unsigned long)fgetc(in_file)) << k_dynamic; - k_dynamic += 8; - } - nb = 4 + ((unsigned) b_dynamic & 0xf); /* number of bit length codes */ - b_dynamic >>= 4; - k_dynamic -= 4; - if (nl > 286 || nd > 30) { - return 1; /* bad lengths */ - } - - /* read in bit-length-code lengths */ - for (j = 0; j < nb; j++) { - while (k_dynamic < 3) { - b_dynamic |= ((unsigned long)fgetc(in_file)) << k_dynamic; - k_dynamic += 8; - } - ll[border[j]] = (unsigned) b_dynamic & 7; - b_dynamic >>= 3; - k_dynamic -= 3; - } - for (; j < 19; j++) { - ll[border[j]] = 0; - } - - /* build decoding table for trees--single level, 7 bit lookup */ - bl = 7; - if ((i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl)) != 0) { - if (i == 1) { - huft_free(tl); - } - return i; /* incomplete code set */ - } - - /* read in literal and distance code lengths */ - n = nl + nd; - m = mask_bits[bl]; - i = l = 0; - while ((unsigned) i < n) { - while (k_dynamic < (unsigned) bl) { - b_dynamic |= ((unsigned long)fgetc(in_file)) << k_dynamic; - k_dynamic += 8; - } - j = (td = tl + ((unsigned) b_dynamic & m))->b; - b_dynamic >>= j; - k_dynamic -= j; - j = td->v.n; - if (j < 16) { /* length of code in bits (0..15) */ - ll[i++] = l = j; /* save last length in l */ - } - else if (j == 16) { /* repeat last length 3 to 6 times */ - while (k_dynamic < 2) { - b_dynamic |= ((unsigned long)fgetc(in_file)) << k_dynamic; - k_dynamic += 8; - } - j = 3 + ((unsigned) b_dynamic & 3); - b_dynamic >>= 2; - k_dynamic -= 2; - if ((unsigned) i + j > n) { - return 1; - } - while (j--) { - ll[i++] = l; - } - } else if (j == 17) { /* 3 to 10 zero length codes */ - while (k_dynamic < 3) { - b_dynamic |= ((unsigned long)fgetc(in_file)) << k_dynamic; - k_dynamic += 8; - } - j = 3 + ((unsigned) b_dynamic & 7); - b_dynamic >>= 3; - k_dynamic -= 3; - if ((unsigned) i + j > n) { - return 1; - } - while (j--) { - ll[i++] = 0; - } - l = 0; - } else { /* j == 18: 11 to 138 zero length codes */ - while (k_dynamic < 7) { - b_dynamic |= ((unsigned long)fgetc(in_file)) << k_dynamic; - k_dynamic += 8; - } - j = 11 + ((unsigned) b_dynamic & 0x7f); - b_dynamic >>= 7; - k_dynamic -= 7; - if ((unsigned) i + j > n) { - return 1; - } - while (j--) { - ll[i++] = 0; - } - l = 0; - } - } - - /* free decoding table for trees */ - huft_free(tl); - - /* restore the global bit buffer */ - bb = b_dynamic; - bk = k_dynamic; - - /* build the decoding tables for literal/length and distance codes */ - bl = lbits; - if ((i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl)) != 0) { - if (i == 1) { - error_msg("Incomplete literal tree"); - huft_free(tl); - } - return i; /* incomplete code set */ - } - bd = dbits; - if ((i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd)) != 0) { - if (i == 1) { - error_msg("incomplete distance tree"); - huft_free(td); - } - huft_free(tl); - return i; /* incomplete code set */ - } - - /* decompress until an end-of-block code */ - if (inflate_codes(tl, td, bl, bd)) { - huft_free(tl); - huft_free(td); - return 1; - } - - /* free the decoding tables, return */ - huft_free(tl); - huft_free(td); - return 0; - } - default: - /* bad block type */ - return 2; - } -} - -/* - * decompress an inflated entry - * - * GLOBAL VARIABLES: outcnt, bk, bb, hufts, inptr - */ -static int inflate() -{ - int e; /* last block flag */ - int r; /* result code */ - unsigned h = 0; /* maximum struct huft's malloc'ed */ - - /* initialize window, bit buffer */ - outcnt = 0; - bk = 0; - bb = 0; - - /* decompress until the last block */ - do { - hufts = 0; - if ((r = inflate_block(&e)) != 0) { - return r; - } - if (hufts > h) { - h = hufts; - } - } while (!e); - - /* Undo too much lookahead. The next read will be byte aligned so we - * can discard unused bits in the last meaningful byte. */ - while (bk >= 8) { - bk -= 8; - ungetc((bb << bk), in_file); - } - - /* flush out window */ - flush_window(); - - /* return success */ - return 0; -} - -/* =========================================================================== - * Unzip in to out. This routine works on both gzip and pkzip files. - * - * IN assertions: the buffer inbuf contains already the beginning of - * the compressed data, from offsets inptr to insize-1 included. - * The magic header has already been checked. The output buffer is cleared. - * in, out: input and output file descriptors - */ -extern int unzip(FILE *l_in_file, FILE *l_out_file) -{ - const int extra_field = 0x04; /* bit 2 set: extra field present */ - const int orig_name = 0x08; /* bit 3 set: original file name present */ - const int comment = 0x10; /* bit 4 set: file comment present */ - unsigned char buf[8]; /* extended local header */ - unsigned char flags; /* compression flags */ - char magic[2]; /* magic header */ - int method; - typedef void (*sig_type) (int); - int exit_code=0; /* program exit code */ - int i; - - in_file = l_in_file; - out_file = l_out_file; - - if (signal(SIGINT, SIG_IGN) != SIG_IGN) { - (void) signal(SIGINT, (sig_type) abort_gzip); - } -#ifdef SIGTERM -// if (signal(SIGTERM, SIG_IGN) != SIG_IGN) { -// (void) signal(SIGTERM, (sig_type) abort_gzip); -// } -#endif -#ifdef SIGHUP - if (signal(SIGHUP, SIG_IGN) != SIG_IGN) { - (void) signal(SIGHUP, (sig_type) abort_gzip); - } -#endif - - signal(SIGPIPE, SIG_IGN); - - /* Allocate all global buffers (for DYN_ALLOC option) */ - window = xmalloc((size_t)(((2L*WSIZE)+1L)*sizeof(unsigned char))); - outcnt = 0; - bytes_out = 0L; - - magic[0] = fgetc(in_file); - magic[1] = fgetc(in_file); - - /* Magic header for gzip files, 1F 8B = \037\213 */ - if (memcmp(magic, "\037\213", 2) != 0) { - error_msg("Invalid gzip magic"); - return EXIT_FAILURE; - } - - method = (int) fgetc(in_file); - if (method != 8) { - error_msg("unknown method %d -- get newer version of gzip", method); - exit_code = 1; - return -1; - } - - flags = (unsigned char) fgetc(in_file); - - /* Ignore time stamp(4), extra flags(1), OS type(1) */ - for (i = 0; i < 6; i++) - fgetc(in_file); - - if ((flags & extra_field) != 0) { - size_t extra; - extra = fgetc(in_file); - extra += fgetc(in_file) << 8; - - for (i = 0; i < extra; i++) - fgetc(in_file); - } - - /* Discard original name if any */ - if ((flags & orig_name) != 0) { - while (fgetc(in_file) != 0); /* null */ - } - - /* Discard file comment if any */ - if ((flags & comment) != 0) { - while (fgetc(in_file) != 0); /* null */ - } - - if (method < 0) { - return(exit_code); - } - - make_crc_table(); - - /* Decompress */ - if (method == 8) { - - int res = inflate(); - - if (res == 3) { - perror_msg("inflate"); - exit_code = 1; - } else if (res != 0) { - error_msg("invalid compressed data--format violated"); - exit_code = 1; - } - - } else { - error_msg("internal error, invalid method"); - exit_code = 1; - } - - /* Get the crc and original length - * crc32 (see algorithm.doc) - * uncompressed input size modulo 2^32 - */ - fread(buf, 1, 8, in_file); - - /* Validate decompression - crc */ - if (!exit_code && (unsigned int)((buf[0] | (buf[1] << 8)) |((buf[2] | (buf[3] << 8)) << 16)) != (crc ^ 0xffffffffL)) { - error_msg("invalid compressed data--crc error"); - exit_code = 1; - } - /* Validate decompression - size */ - if (!exit_code && ((buf[4] | (buf[5] << 8)) |((buf[6] | (buf[7] << 8)) << 16)) != (unsigned long) bytes_out) { - error_msg("invalid compressed data--length error"); - exit_code = 1; - } - - free(window); - free(crc_table); - - window = NULL; - crc_table = NULL; - - return exit_code; -} |