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+/* 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;
+}
generated by cgit v0.9.1 at 2024-11-22 20:39:16 (EST)