Move unzip, gz_open, gz_close to libbb

3 files changed, 1063 insertions, 0 deletions

diff --git a/libbb/gz_open.c b/libbb/gz_open.c
new file mode 100644
index 000000000..1be5a171d
--- /dev/null
+++ b/libbb/gz_open.c
@@ -0,0 +1,34 @@
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "libbb.h"
+
+extern int gz_open(FILE *compressed_file, int *pid)
+{
+	int unzip_pipe[2];
+
+	if (pipe(unzip_pipe)!=0) {
+		error_msg("pipe error");
+		return(EXIT_FAILURE);
+	}
+	if ((*pid = fork()) == -1) {
+		error_msg("fork failured");
+		return(EXIT_FAILURE);
+	}
+	if (*pid==0) {
+		/* child process */
+		close(unzip_pipe[0]);
+		unzip(compressed_file, fdopen(unzip_pipe[1], "w"));
+		printf("finished unzipping\n");
+		fflush(NULL);
+		fclose(compressed_file);
+		close(unzip_pipe[1]);
+		exit(EXIT_SUCCESS);
+	}
+	
+	close(unzip_pipe[1]);
+	return(unzip_pipe[0]);
+}
\ No newline at end of file
diff --git a/libbb/libbb.h b/libbb/libbb.h
index 06215d12b..279b4e78b 100644
--- a/libbb/libbb.h
+++ b/libbb/libbb.h
@@ -227,4 +227,8 @@ typedef struct ar_headers_s {
 } ar_headers_t;
 extern ar_headers_t get_ar_headers(int srcFd);
 extern int deb_extract(int optflags, const char *dir_name, const char *deb_filename);
+
+extern int unzip(FILE *l_in_file, FILE *l_out_file);
+extern void gz_close(int gunzip_pid);
+extern int gz_open(FILE *compressed_file, int *pid);
 #endif /* __LIBBB_H__ */
diff --git a/libbb/unzip.c b/libbb/unzip.c
new file mode 100644
index 000000000..576fe340a
--- /dev/null
+++ b/libbb/unzip.c
@@ -0,0 +1,1025 @@
+/* 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 <andersen@lineo.com>, <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.
+ */
+
+#if 0
+static char *license_msg[] = {
+	"   Copyright (C) 1992-1993 Jean-loup Gailly",
+	"   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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.",
+	0
+};
+#endif
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <stdlib.h>
+#include "libbb.h"
+#define BB_DECLARE_EXTERN
+#define bb_need_memory_exhausted
+#define bb_need_name_too_long
+#include "../messages.c"
+
+FILE *in_file, *out_file;
+
+/* these are freed by gz_close */
+static unsigned char *window;
+static unsigned long *crc_table;
+
+static unsigned long crc = 0xffffffffL;	/* shift register contents */
+
+/* Return codes from gzip */
+static const int ERROR = 1;
+
+/*
+ * 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 */
+
+unsigned hufts;		/* track memory usage */
+unsigned long bb;			/* bit buffer */
+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;
+
+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(ERROR);
+}
+
+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};
+
+	crc_table = (unsigned long *) malloc(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.)
+ */
+void flush_window()
+{
+	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) {
+		error_msg_and_die("Couldnt write");
+	}
+	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 */
+	register unsigned i;	/* counter, current code */
+	register unsigned j;	/* counter */
+	register int k;		/* number of bits in current code */
+	int l;			/* bits per table (returned in m) */
+	register unsigned *p;		/* pointer into c[], b[], or v[] */
+	register 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 */
+	register 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)
+{
+	register 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 */
+	register unsigned long b;				/* bit buffer */
+	register 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 */
+	register unsigned long b;			/* bit buffer */
+	register 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 */
+			register unsigned long b_stored;			/* bit buffer */
+			register 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))
+				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 */
+			register unsigned long b_dynamic;	/* bit buffer */
+			register 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))
+				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);
+
+	/* 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 */
+
+	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
+
+	/* Allocate all global buffers (for DYN_ALLOC option) */
+	window = xmalloc((size_t)(((2L*WSIZE)+1L)*sizeof(unsigned char)));
+	outcnt = 0;
+	bytes_out = 0L;
+
+	/* set the buffer size */
+	setvbuf(in_file, NULL, _IOFBF, 0x8000);
+
+	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) */
+	fseek(in_file, 6, SEEK_CUR);
+
+	if ((flags & extra_field) != 0) {
+		fseek(in_file, (size_t) fgetc(in_file) + ((size_t)fgetc(in_file) << 8), SEEK_CUR);
+	}
+
+	/* 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) {
+		printf("it failed\n");
+		return(exit_code);		/* error message already emitted */
+	}
+
+	make_crc_table();
+
+	/* Decompress */
+	if (method == 8) {
+
+		int res = inflate();
+
+		if (res == 3) {
+			error_msg(memory_exhausted);
+		} else if (res != 0) {
+			error_msg("invalid compressed data--format violated");
+		}
+
+	} else {
+		error_msg("internal error, invalid method");
+	}
+
+	/* 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 (((buf[0] | (buf[1] << 8)) |((buf[2] | (buf[3] << 8)) << 16)) != (crc ^ 0xffffffffL)) {
+		error_msg("invalid compressed data--crc error");
+	}
+	/* Validate decompression - size */
+	if (((buf[4] | (buf[5] << 8)) |((buf[6] | (buf[7] << 8)) << 16)) != (unsigned long) bytes_out) {
+		error_msg("invalid compressed data--length error");
+	}
+
+	free(window);
+	free(crc_table);
+
+	return 0;
+}
+
+/*
+ * This needs access to global variables wondow and crc_table, so its not in its own file.
+ */
+extern void gz_close(int gunzip_pid)
+{
+	if (kill(gunzip_pid, SIGTERM) == -1) {
+		error_msg_and_die("***  Couldnt kill old gunzip process *** aborting");
+	}
+
+	if (waitpid(gunzip_pid, NULL, 0) == -1) {
+		printf("Couldnt wait ?");
+	}
+	free(window);
+	free(crc_table);
+}