04095e58fb
This way, we can new get rid of all that tedious #define rubbish we used to need to enable specific messages. This way is enormously simpler, and as a bonus also ends up saving us 96 bytes. -Erik
1029 lines
28 KiB
C
1029 lines
28 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
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* gunzip implementation for busybox
|
|
*
|
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* Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
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*
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* Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
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* based on gzip sources
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*
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* Adjusted further by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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* to support files as well as stdin/stdout, and to generally behave itself wrt
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* command line handling.
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*
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* General cleanup to better adhere to the style guide and make use of standard
|
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* busybox functions by Glenn McGrath <bug1@optushome.com.au>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
|
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
|
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
|
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* along with this program; if not, write to the Free Software
|
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
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* Copyright (C) 1992-1993 Jean-loup Gailly
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* The unzip code was written and put in the public domain by Mark Adler.
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* Portions of the lzw code are derived from the public domain 'compress'
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* written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
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* Ken Turkowski, Dave Mack and Peter Jannesen.
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*
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* See the license_msg below and the file COPYING for the software license.
|
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* See the file algorithm.doc for the compression algorithms and file formats.
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*/
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#if 0
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static char *license_msg[] = {
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" Copyright (C) 1992-1993 Jean-loup Gailly",
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" This program is free software; you can redistribute it and/or modify",
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" 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.",
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"",
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" 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.",
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"",
|
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" 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.",
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0
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};
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#endif
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <stdlib.h>
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#include "libbb.h"
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FILE *in_file, *out_file;
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/* these are freed by gz_close */
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static unsigned char *window;
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static unsigned long *crc_table;
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static unsigned long crc = 0xffffffffL; /* shift register contents */
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/* Return codes from gzip */
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static const int ERROR = 1;
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/*
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* window size--must be a power of two, and
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* at least 32K for zip's deflate method
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*/
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static const int WSIZE = 0x8000;
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/* If BMAX needs to be larger than 16, then h and x[] should be ulg. */
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static const int BMAX = 16; /* maximum bit length of any code (16 for explode) */
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static const int N_MAX = 288; /* maximum number of codes in any set */
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static long bytes_out; /* number of output bytes */
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static unsigned long outcnt; /* bytes in output buffer */
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unsigned hufts; /* track memory usage */
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unsigned long bb; /* bit buffer */
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unsigned bk; /* bits in bit buffer */
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typedef struct huft_s {
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unsigned char e; /* number of extra bits or operation */
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unsigned char b; /* number of bits in this code or subcode */
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union {
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unsigned short n; /* literal, length base, or distance base */
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struct huft_s *t; /* pointer to next level of table */
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} v;
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} huft_t;
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unsigned short mask_bits[] = {
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0x0000,
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0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
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0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
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};
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//static int error_number = 0;
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/* ========================================================================
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* Signal and error handler.
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*/
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static void abort_gzip()
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{
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error_msg("gzip aborted\n");
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exit(ERROR);
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}
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static void make_crc_table()
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{
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unsigned long table_entry; /* crc shift register */
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unsigned long poly = 0; /* polynomial exclusive-or pattern */
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int i; /* counter for all possible eight bit values */
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int k; /* byte being shifted into crc apparatus */
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/* terms of polynomial defining this crc (except x^32): */
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static int p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
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crc_table = (unsigned long *) malloc(256 * sizeof(unsigned long));
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/* Make exclusive-or pattern from polynomial (0xedb88320) */
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for (i = 0; i < sizeof(p)/sizeof(int); i++)
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poly |= 1L << (31 - p[i]);
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/* Compute and print table of CRC's, five per line */
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for (i = 0; i < 256; i++) {
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table_entry = i;
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/* The idea to initialize the register with the byte instead of
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* zero was stolen from Haruhiko Okumura's ar002
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*/
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for (k = 8; k; k--) {
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table_entry = table_entry & 1 ? (table_entry >> 1) ^ poly : table_entry >> 1;
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}
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crc_table[i]=table_entry;
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}
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}
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/* ===========================================================================
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* Write the output window window[0..outcnt-1] and update crc and bytes_out.
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* (Used for the decompressed data only.)
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*/
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void flush_window()
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{
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int n;
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if (outcnt == 0)
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return;
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for (n = 0; n < outcnt; n++) {
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crc = crc_table[((int) crc ^ (window[n])) & 0xff] ^ (crc >> 8);
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}
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if (fwrite(window, 1, outcnt, out_file) != outcnt) {
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error_msg_and_die("Couldnt write");
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}
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bytes_out += (unsigned long) outcnt;
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outcnt = 0;
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}
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/*
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* Free the malloc'ed tables built by huft_build(), which makes a linked
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* list of the tables it made, with the links in a dummy first entry of
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* each table.
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* t: table to free
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*/
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static int huft_free(huft_t *t)
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{
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huft_t *p, *q;
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/* Go through linked list, freeing from the malloced (t[-1]) address. */
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p = t;
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while (p != (huft_t *) NULL) {
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q = (--p)->v.t;
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free((char *) p);
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p = q;
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}
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return 0;
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}
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/* Given a list of code lengths and a maximum table size, make a set of
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* tables to decode that set of codes. Return zero on success, one if
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* the given code set is incomplete (the tables are still built in this
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* case), two if the input is invalid (all zero length codes or an
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* oversubscribed set of lengths), and three if not enough memory.
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*
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* b: code lengths in bits (all assumed <= BMAX)
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* n: number of codes (assumed <= N_MAX)
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* s: number of simple-valued codes (0..s-1)
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* d: list of base values for non-simple codes
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* e: list of extra bits for non-simple codes
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* t: result: starting table
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* m: maximum lookup bits, returns actual
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*/
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static int huft_build(unsigned int *b, const unsigned int n, const unsigned int s,
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const unsigned short *d, const unsigned short *e, huft_t **t, int *m)
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{
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unsigned a; /* counter for codes of length k */
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unsigned c[BMAX + 1]; /* bit length count table */
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unsigned f; /* i repeats in table every f entries */
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int g; /* maximum code length */
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int h; /* table level */
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register unsigned i; /* counter, current code */
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register unsigned j; /* counter */
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register int k; /* number of bits in current code */
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int l; /* bits per table (returned in m) */
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register unsigned *p; /* pointer into c[], b[], or v[] */
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register huft_t *q; /* points to current table */
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huft_t r; /* table entry for structure assignment */
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huft_t *u[BMAX]; /* table stack */
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unsigned v[N_MAX]; /* values in order of bit length */
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register int w; /* bits before this table == (l * h) */
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unsigned x[BMAX + 1]; /* bit offsets, then code stack */
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unsigned *xp; /* pointer into x */
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int y; /* number of dummy codes added */
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unsigned z; /* number of entries in current table */
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/* Generate counts for each bit length */
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memset ((void *)(c), 0, sizeof(c));
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p = b;
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i = n;
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do {
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c[*p]++; /* assume all entries <= BMAX */
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p++; /* Can't combine with above line (Solaris bug) */
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} while (--i);
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if (c[0] == n) { /* null input--all zero length codes */
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*t = (huft_t *) NULL;
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*m = 0;
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return 0;
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}
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/* Find minimum and maximum length, bound *m by those */
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l = *m;
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for (j = 1; j <= BMAX; j++)
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if (c[j])
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break;
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k = j; /* minimum code length */
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if ((unsigned) l < j)
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l = j;
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for (i = BMAX; i; i--)
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if (c[i])
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break;
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g = i; /* maximum code length */
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if ((unsigned) l > i)
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l = i;
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*m = l;
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/* Adjust last length count to fill out codes, if needed */
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for (y = 1 << j; j < i; j++, y <<= 1)
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if ((y -= c[j]) < 0)
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return 2; /* bad input: more codes than bits */
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if ((y -= c[i]) < 0)
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return 2;
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c[i] += y;
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/* Generate starting offsets into the value table for each length */
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x[1] = j = 0;
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p = c + 1;
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xp = x + 2;
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while (--i) { /* note that i == g from above */
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*xp++ = (j += *p++);
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}
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/* Make a table of values in order of bit lengths */
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p = b;
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i = 0;
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do {
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if ((j = *p++) != 0)
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v[x[j]++] = i;
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} while (++i < n);
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/* Generate the Huffman codes and for each, make the table entries */
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x[0] = i = 0; /* first Huffman code is zero */
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p = v; /* grab values in bit order */
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h = -1; /* no tables yet--level -1 */
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w = -l; /* bits decoded == (l * h) */
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u[0] = (huft_t *) NULL; /* just to keep compilers happy */
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q = (huft_t *) NULL; /* ditto */
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z = 0; /* ditto */
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/* go through the bit lengths (k already is bits in shortest code) */
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for (; k <= g; k++) {
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a = c[k];
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while (a--) {
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/* here i is the Huffman code of length k bits for value *p */
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/* make tables up to required level */
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while (k > w + l) {
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h++;
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w += l; /* previous table always l bits */
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|
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/* compute minimum size table less than or equal to l bits */
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z = (z = g - w) > (unsigned) l ? l : z; /* upper limit on table size */
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if ((f = 1 << (j = k - w)) > a + 1) { /* try a k-w bit table *//* too few codes for k-w bit table */
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f -= a + 1; /* deduct codes from patterns left */
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xp = c + k;
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while (++j < z) { /* try smaller tables up to z bits */
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if ((f <<= 1) <= *++xp)
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break; /* enough codes to use up j bits */
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f -= *xp; /* else deduct codes from patterns */
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}
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}
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z = 1 << j; /* table entries for j-bit table */
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|
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/* allocate and link in new table */
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if ((q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t))) == NULL) {
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if (h) {
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huft_free(u[0]);
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}
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return 3; /* not enough memory */
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}
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hufts += z + 1; /* track memory usage */
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*t = q + 1; /* link to list for huft_free() */
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*(t = &(q->v.t)) = NULL;
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u[h] = ++q; /* table starts after link */
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|
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/* connect to last table, if there is one */
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if (h) {
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x[h] = i; /* save pattern for backing up */
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r.b = (unsigned char) l; /* bits to dump before this table */
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r.e = (unsigned char) (16 + j); /* bits in this table */
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r.v.t = q; /* pointer to this table */
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j = i >> (w - l); /* (get around Turbo C bug) */
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u[h - 1][j] = r; /* connect to last table */
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}
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}
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|
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/* set up table entry in r */
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r.b = (unsigned char) (k - w);
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if (p >= v + n)
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r.e = 99; /* out of values--invalid code */
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else if (*p < s) {
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r.e = (unsigned char) (*p < 256 ? 16 : 15); /* 256 is end-of-block code */
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r.v.n = (unsigned short) (*p); /* simple code is just the value */
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p++; /* one compiler does not like *p++ */
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} else {
|
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r.e = (unsigned char) e[*p - s]; /* non-simple--look up in lists */
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r.v.n = d[*p++ - s];
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}
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|
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/* fill code-like entries with r */
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f = 1 << (k - w);
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for (j = i >> w; j < z; j += f)
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q[j] = r;
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|
|
/* backwards increment the k-bit code i */
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for (j = 1 << (k - 1); i & j; j >>= 1)
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i ^= j;
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i ^= j;
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|
|
|
/* 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 */
|
|
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
|
|
|
|
/* 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) */
|
|
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) {
|
|
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);
|
|
}
|