+++ /dev/null
-#include "config.h"
-#include "libbb.h"
-
-/* uncompress for busybox -- (c) 2002 Robert Griebl
- *
- * based on the original compress42.c source
- * (see disclaimer below)
- */
-
-
-/* (N)compress42.c - File compression ala IEEE Computer, Mar 1992.
- *
- * Authors:
- * Spencer W. Thomas (decvax!harpo!utah-cs!utah-gr!thomas)
- * Jim McKie (decvax!mcvax!jim)
- * Steve Davies (decvax!vax135!petsd!peora!srd)
- * Ken Turkowski (decvax!decwrl!turtlevax!ken)
- * James A. Woods (decvax!ihnp4!ames!jaw)
- * Joe Orost (decvax!vax135!petsd!joe)
- * Dave Mack (csu@alembic.acs.com)
- * Peter Jannesen, Network Communication Systems
- * (peter@ncs.nl)
- *
- * marc@suse.de : a small security fix for a buffer overflow
- *
- * [... History snipped ...]
- *
- */
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-
-/* Defailt input buffer size */
-#define IBUFSIZ 2048
-
-/* Default output buffer size */
-#define OBUFSIZ 2048
-
-/* Defines for third byte of header */
-#define MAGIC_1 (char_type)'\037' /* First byte of compressed file */
-#define MAGIC_2 (char_type)'\235' /* Second byte of compressed file */
-#define BIT_MASK 0x1f /* Mask for 'number of compresssion bits' */
- /* Masks 0x20 and 0x40 are free. */
- /* I think 0x20 should mean that there is */
- /* a fourth header byte (for expansion). */
-#define BLOCK_MODE 0x80 /* Block compresssion if table is full and */
- /* compression rate is dropping flush tables */
- /* the next two codes should not be changed lightly, as they must not */
- /* lie within the contiguous general code space. */
-#define FIRST 257 /* first free entry */
-#define CLEAR 256 /* table clear output code */
-
-#define INIT_BITS 9 /* initial number of bits/code */
-
-
-/* machine variants which require cc -Dmachine: pdp11, z8000, DOS */
-#define FAST
-
-#define HBITS 17 /* 50% occupancy */
-#define HSIZE (1<<HBITS)
-#define HMASK (HSIZE-1)
-#define HPRIME 9941
-#define BITS 16
-#undef MAXSEG_64K
-#define MAXCODE(n) (1L << (n))
-
-/* Block compress mode -C compatible with 2.0 */
-int block_mode = BLOCK_MODE;
-
-/* user settable max # bits/code */
-int maxbits = BITS;
-
-/* Exitcode of compress (-1 no file compressed) */
-int exit_code = -1;
-
-/* Input buffer */
-unsigned char inbuf[IBUFSIZ + 64];
-
-/* Output buffer */
-unsigned char outbuf[OBUFSIZ + 2048];
-
-
-long int htab[HSIZE];
-unsigned short codetab[HSIZE];
-
-#define htabof(i) htab[i]
-#define codetabof(i) codetab[i]
-#define tab_prefixof(i) codetabof(i)
-#define tab_suffixof(i) ((unsigned char *)(htab))[i]
-#define de_stack ((unsigned char *)&(htab[HSIZE-1]))
-#define clear_htab() memset(htab, -1, sizeof(htab))
-#define clear_tab_prefixof() memset(codetab, 0, 256);
-
-
-/*
- * Decompress stdin to stdout. This routine adapts to the codes in the
- * file building the "string" table on-the-fly; requiring no table to
- * be stored in the compressed file. The tables used herein are shared
- * with those of the compress() routine. See the definitions above.
- */
-
-extern int uncompress(int fd_in, int fd_out)
-{
- unsigned char *stackp;
- long int code;
- int finchar;
- long int oldcode;
- long int incode;
- int inbits;
- int posbits;
- int outpos;
- int insize;
- int bitmask;
- long int free_ent;
- long int maxcode;
- long int maxmaxcode;
- int n_bits;
- int rsize = 0;
-
- insize = 0;
-
- inbuf[0] = bb_xread_char(fd_in);
-
- maxbits = inbuf[0] & BIT_MASK;
- block_mode = inbuf[0] & BLOCK_MODE;
- maxmaxcode = MAXCODE(maxbits);
-
- if (maxbits > BITS) {
- bb_error_msg("compressed with %d bits, can only handle %d bits", maxbits,
- BITS);
- return -1;
- }
-
- maxcode = MAXCODE(n_bits = INIT_BITS) - 1;
- bitmask = (1 << n_bits) - 1;
- oldcode = -1;
- finchar = 0;
- outpos = 0;
- posbits = 0 << 3;
-
- free_ent = ((block_mode) ? FIRST : 256);
-
- /* As above, initialize the first 256 entries in the table. */
- clear_tab_prefixof();
-
- for (code = 255; code >= 0; --code) {
- tab_suffixof(code) = (unsigned char) code;
- }
-
- do {
- resetbuf:;
- {
- int i;
- int e;
- int o;
-
- e = insize - (o = (posbits >> 3));
-
- for (i = 0; i < e; ++i)
- inbuf[i] = inbuf[i + o];
-
- insize = e;
- posbits = 0;
- }
-
- if (insize < (int) sizeof(inbuf) - IBUFSIZ) {
- rsize = safe_read(fd_in, inbuf + insize, IBUFSIZ);
- insize += rsize;
- }
-
- inbits = ((rsize > 0) ? (insize - insize % n_bits) << 3 :
- (insize << 3) - (n_bits - 1));
-
- while (inbits > posbits) {
- if (free_ent > maxcode) {
- posbits =
- ((posbits - 1) +
- ((n_bits << 3) -
- (posbits - 1 + (n_bits << 3)) % (n_bits << 3)));
- ++n_bits;
- if (n_bits == maxbits) {
- maxcode = maxmaxcode;
- } else {
- maxcode = MAXCODE(n_bits) - 1;
- }
- bitmask = (1 << n_bits) - 1;
- goto resetbuf;
- }
- {
- unsigned char *p = &inbuf[posbits >> 3];
-
- code =
- ((((long) (p[0])) | ((long) (p[1]) << 8) |
- ((long) (p[2]) << 16)) >> (posbits & 0x7)) & bitmask;
- }
- posbits += n_bits;
-
-
- if (oldcode == -1) {
- outbuf[outpos++] = (unsigned char) (finchar =
- (int) (oldcode = code));
- continue;
- }
-
- if (code == CLEAR && block_mode) {
- clear_tab_prefixof();
- free_ent = FIRST - 1;
- posbits =
- ((posbits - 1) +
- ((n_bits << 3) -
- (posbits - 1 + (n_bits << 3)) % (n_bits << 3)));
- maxcode = MAXCODE(n_bits = INIT_BITS) - 1;
- bitmask = (1 << n_bits) - 1;
- goto resetbuf;
- }
-
- incode = code;
- stackp = de_stack;
-
- /* Special case for KwKwK string. */
- if (code >= free_ent) {
- if (code > free_ent) {
- unsigned char *p;
-
- posbits -= n_bits;
- p = &inbuf[posbits >> 3];
-
- bb_error_msg
- ("insize:%d posbits:%d inbuf:%02X %02X %02X %02X %02X (%d)",
- insize, posbits, p[-1], p[0], p[1], p[2], p[3],
- (posbits & 07));
- bb_error_msg("uncompress: corrupt input");
- return -1;
- }
-
- *--stackp = (unsigned char) finchar;
- code = oldcode;
- }
-
- /* Generate output characters in reverse order */
- while ((long int) code >= (long int) 256) {
- *--stackp = tab_suffixof(code);
- code = tab_prefixof(code);
- }
-
- *--stackp = (unsigned char) (finchar = tab_suffixof(code));
-
- /* And put them out in forward order */
- {
- int i;
-
- if (outpos + (i = (de_stack - stackp)) >= OBUFSIZ) {
- do {
- if (i > OBUFSIZ - outpos) {
- i = OBUFSIZ - outpos;
- }
-
- if (i > 0) {
- memcpy(outbuf + outpos, stackp, i);
- outpos += i;
- }
-
- if (outpos >= OBUFSIZ) {
- write(fd_out, outbuf, outpos);
- outpos = 0;
- }
- stackp += i;
- } while ((i = (de_stack - stackp)) > 0);
- } else {
- memcpy(outbuf + outpos, stackp, i);
- outpos += i;
- }
- }
-
- /* Generate the new entry. */
- if ((code = free_ent) < maxmaxcode) {
- tab_prefixof(code) = (unsigned short) oldcode;
- tab_suffixof(code) = (unsigned char) finchar;
- free_ent = code + 1;
- }
-
- /* Remember previous code. */
- oldcode = incode;
- }
-
- } while (rsize > 0);
-
- if (outpos > 0) {
- write(fd_out, outbuf, outpos);
- }
-
- return 0;
-}
+++ /dev/null
-/* 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@codepoet.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>
- *
- * read_gz interface + associated hacking by Laurence Anderson
- *
- * 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 <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include "config.h"
-#include "busybox.h"
-#include "unarchive.h"
-
-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 int gunzip_src_fd;
-unsigned int gunzip_bytes_out; /* number of output bytes */
-static unsigned int gunzip_outbuf_count; /* bytes in output buffer */
-
-/* gunzip_window size--must be a power of two, and
- * at least 32K for zip's deflate method */
-static const int gunzip_wsize = 0x8000;
-static unsigned char *gunzip_window;
-
-static unsigned int *gunzip_crc_table;
-unsigned int gunzip_crc;
-
-/* If BMAX needs to be larger than 16, then h and x[] should be ulg. */
-#define BMAX 16 /* maximum bit length of any code (16 for explode) */
-#define N_MAX 288 /* maximum number of codes in any set */
-
-/* bitbuffer */
-static unsigned int gunzip_bb; /* bit buffer */
-static unsigned char gunzip_bk; /* bits in bit buffer */
-
-/* These control the size of the bytebuffer */
-static unsigned int bytebuffer_max = 0x8000;
-static unsigned char *bytebuffer = NULL;
-static unsigned int bytebuffer_offset = 0;
-static unsigned int bytebuffer_size = 0;
-
-static const unsigned short mask_bits[] = {
- 0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
- 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
-};
-
-/* Copy lengths for literal codes 257..285 */
-static const unsigned short cplens[] = {
- 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. */
-/* Extra bits for literal codes 257..285 */
-static const unsigned char cplext[] = {
- 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 */
-
-/* Copy offsets for distance codes 0..29 */
-static const unsigned short cpdist[] = {
- 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
-};
-
-/* Extra bits for distance codes */
-static const unsigned char cpdext[] = {
- 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
-};
-
-/* Tables for deflate from PKZIP's appnote.txt. */
-/* Order of the bit length code lengths */
-static const unsigned char border[] = {
- 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
-};
-
-static unsigned int fill_bitbuffer(unsigned int bitbuffer, unsigned int *current, const unsigned int required)
-{
- while (*current < required) {
- if (bytebuffer_offset >= bytebuffer_size) {
- /* Leave the first 4 bytes empty so we can always unwind the bitbuffer
- * to the front of the bytebuffer, leave 4 bytes free at end of tail
- * so we can easily top up buffer in check_trailer_gzip() */
- bytebuffer_size = 4 + bb_xread(gunzip_src_fd, &bytebuffer[4], bytebuffer_max - 8);
- bytebuffer_offset = 4;
- }
- bitbuffer |= ((unsigned int) bytebuffer[bytebuffer_offset]) << *current;
- bytebuffer_offset++;
- *current += 8;
- }
- return(bitbuffer);
-}
-
-static void make_gunzip_crc_table(void)
-{
- const unsigned int poly = 0xedb88320; /* polynomial exclusive-or pattern */
- unsigned short i; /* counter for all possible eight bit values */
-
- /* initial shift register value */
- gunzip_crc = 0xffffffffL;
- gunzip_crc_table = (unsigned int *) malloc(256 * sizeof(unsigned int));
-
- /* Compute and print table of CRC's, five per line */
- for (i = 0; i < 256; i++) {
- unsigned int table_entry; /* crc shift register */
- unsigned char k; /* byte being shifted into crc apparatus */
-
- 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--) {
- if (table_entry & 1) {
- table_entry = (table_entry >> 1) ^ poly;
- } else {
- table_entry >>= 1;
- }
- }
- gunzip_crc_table[i] = table_entry;
- }
-}
-
-/*
- * 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;
- huft_t *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 char *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 */
- q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t));
-
- *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 * my_tl, huft_t * my_td, const unsigned int my_bl, const unsigned int my_bd, int setup)
-{
- static unsigned int e; /* table entry flag/number of extra bits */
- static unsigned int n, d; /* length and index for copy */
- static unsigned int w; /* current gunzip_window position */
- static huft_t *t; /* pointer to table entry */
- static unsigned int ml, md; /* masks for bl and bd bits */
- static unsigned int b; /* bit buffer */
- static unsigned int k; /* number of bits in bit buffer */
- static huft_t *tl, *td;
- static unsigned int bl, bd;
- static int resumeCopy = 0;
-
- if (setup) { // 1st time we are called, copy in variables
- tl = my_tl;
- td = my_td;
- bl = my_bl;
- bd = my_bd;
- /* make local copies of globals */
- b = gunzip_bb; /* initialize bit buffer */
- k = gunzip_bk;
- w = gunzip_outbuf_count; /* initialize gunzip_window position */
-
- /* inflate the coded data */
- ml = mask_bits[bl]; /* precompute masks for speed */
- md = mask_bits[bd];
- return 0; // Don't actually do anything the first time
- }
-
- if (resumeCopy) goto do_copy;
-
- while (1) { /* do until end of block */
- b = fill_bitbuffer(b, &k, bl);
- if ((e = (t = tl + ((unsigned) b & ml))->e) > 16)
- do {
- if (e == 99) {
- bb_error_msg_and_die("inflate_codes error 1");;
- }
- b >>= t->b;
- k -= t->b;
- e -= 16;
- b = fill_bitbuffer(b, &k, e);
- } 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 */
- gunzip_window[w++] = (unsigned char) t->v.n;
- if (w == gunzip_wsize) {
- gunzip_outbuf_count = (w);
- //flush_gunzip_window();
- w = 0;
- return 1; // We have a block to read
- }
- } else { /* it's an EOB or a length */
-
- /* exit if end of block */
- if (e == 15) {
- break;
- }
-
- /* get length of block to copy */
- b = fill_bitbuffer(b, &k, e);
- n = t->v.n + ((unsigned) b & mask_bits[e]);
- b >>= e;
- k -= e;
-
- /* decode distance of block to copy */
- b = fill_bitbuffer(b, &k, bd);
- if ((e = (t = td + ((unsigned) b & md))->e) > 16)
- do {
- if (e == 99)
- bb_error_msg_and_die("inflate_codes error 2");;
- b >>= t->b;
- k -= t->b;
- e -= 16;
- b = fill_bitbuffer(b, &k, e);
- } while ((e =
- (t =
- t->v.t + ((unsigned) b & mask_bits[e]))->e) > 16);
- b >>= t->b;
- k -= t->b;
- b = fill_bitbuffer(b, &k, e);
- d = w - t->v.n - ((unsigned) b & mask_bits[e]);
- b >>= e;
- k -= e;
-
- /* do the copy */
-do_copy: do {
- n -= (e =
- (e =
- gunzip_wsize - ((d &= gunzip_wsize - 1) > w ? d : w)) > n ? n : e);
- /* copy to new buffer to prevent possible overwrite */
- if (w - d >= e) { /* (this test assumes unsigned comparison) */
- memcpy(gunzip_window + w, gunzip_window + d, e);
- w += e;
- d += e;
- } else {
- /* do it slow to avoid memcpy() overlap */
- /* !NOMEMCPY */
- do {
- gunzip_window[w++] = gunzip_window[d++];
- } while (--e);
- }
- if (w == gunzip_wsize) {
- gunzip_outbuf_count = (w);
- if (n) resumeCopy = 1;
- else resumeCopy = 0;
- //flush_gunzip_window();
- w = 0;
- return 1;
- }
- } while (n);
- resumeCopy = 0;
- }
- }
-
- /* restore the globals from the locals */
- gunzip_outbuf_count = w; /* restore global gunzip_window pointer */
- gunzip_bb = b; /* restore global bit buffer */
- gunzip_bk = k;
-
- /* normally just after call to inflate_codes, but save code by putting it here */
- /* free the decoding tables, return */
- huft_free(tl);
- huft_free(td);
-
- /* done */
- return 0;
-}
-
-static int inflate_stored(int my_n, int my_b_stored, int my_k_stored, int setup)
-{
- static int n, b_stored, k_stored, w;
- if (setup) {
- n = my_n;
- b_stored = my_b_stored;
- k_stored = my_k_stored;
- w = gunzip_outbuf_count; /* initialize gunzip_window position */
- return 0; // Don't do anything first time
- }
-
- /* read and output the compressed data */
- while (n--) {
- b_stored = fill_bitbuffer(b_stored, &k_stored, 8);
- gunzip_window[w++] = (unsigned char) b_stored;
- if (w == (unsigned int) gunzip_wsize) {
- gunzip_outbuf_count = (w);
- //flush_gunzip_window();
- w = 0;
- b_stored >>= 8;
- k_stored -= 8;
- return 1; // We have a block
- }
- b_stored >>= 8;
- k_stored -= 8;
- }
-
- /* restore the globals from the locals */
- gunzip_outbuf_count = w; /* restore global gunzip_window pointer */
- gunzip_bb = b_stored; /* restore global bit buffer */
- gunzip_bk = k_stored;
- return 0; // Finished
-}
-
-/*
- * decompress an inflated block
- * e: last block flag
- *
- * GLOBAL VARIABLES: bb, kk,
- */
- // Return values: -1 = inflate_stored, -2 = inflate_codes
-static int inflate_block(int *e)
-{
- unsigned t; /* block type */
- register unsigned int b; /* bit buffer */
- unsigned int k; /* number of bits in bit buffer */
-
- /* make local bit buffer */
-
- b = gunzip_bb;
- k = gunzip_bk;
-
- /* read in last block bit */
- b = fill_bitbuffer(b, &k, 1);
- *e = (int) b & 1;
- b >>= 1;
- k -= 1;
-
- /* read in block type */
- b = fill_bitbuffer(b, &k, 2);
- t = (unsigned) b & 3;
- b >>= 2;
- k -= 2;
-
- /* restore the global bit buffer */
- gunzip_bb = b;
- gunzip_bk = k;
-
- /* inflate that block type */
- switch (t) {
- case 0: /* Inflate stored */
- {
- unsigned int n; /* number of bytes in block */
- unsigned int b_stored; /* bit buffer */
- unsigned int k_stored; /* number of bits in bit buffer */
-
- /* make local copies of globals */
- b_stored = gunzip_bb; /* initialize bit buffer */
- k_stored = gunzip_bk;
-
- /* go to byte boundary */
- n = k_stored & 7;
- b_stored >>= n;
- k_stored -= n;
-
- /* get the length and its complement */
- b_stored = fill_bitbuffer(b_stored, &k_stored, 16);
- n = ((unsigned) b_stored & 0xffff);
- b_stored >>= 16;
- k_stored -= 16;
-
- b_stored = fill_bitbuffer(b_stored, &k_stored, 16);
- if (n != (unsigned) ((~b_stored) & 0xffff)) {
- return 1; /* error in compressed data */
- }
- b_stored >>= 16;
- k_stored -= 16;
-
- inflate_stored(n, b_stored, k_stored, 1); // Setup inflate_stored
- return -1;
- }
- 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 */
- unsigned int bl; /* lookup bits for tl */
- unsigned 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 */
- inflate_codes(tl, td, bl, bd, 1); // Setup inflate_codes
-
- /* huft_free code moved into inflate_codes */
-
- return -2;
- }
- case 2: /* Inflate dynamic */
- {
- const int dbits = 6; /* bits in base distance lookup table */
- const int lbits = 9; /* bits in base literal/length lookup table */
-
- huft_t *tl; /* literal/length code table */
- huft_t *td; /* distance code table */
- unsigned int i; /* temporary variables */
- unsigned int j;
- unsigned int l; /* last length */
- unsigned int m; /* mask for bit lengths table */
- unsigned int n; /* number of lengths to get */
- unsigned int bl; /* lookup bits for tl */
- unsigned int bd; /* lookup bits for td */
- unsigned int nb; /* number of bit length codes */
- unsigned int nl; /* number of literal/length codes */
- unsigned int nd; /* number of distance codes */
-
- unsigned int ll[286 + 30]; /* literal/length and distance code lengths */
- unsigned int b_dynamic; /* bit buffer */
- unsigned int k_dynamic; /* number of bits in bit buffer */
-
- /* make local bit buffer */
- b_dynamic = gunzip_bb;
- k_dynamic = gunzip_bk;
-
- /* read in table lengths */
- b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 5);
- nl = 257 + ((unsigned int) b_dynamic & 0x1f); /* number of literal/length codes */
-
- b_dynamic >>= 5;
- k_dynamic -= 5;
- b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 5);
- nd = 1 + ((unsigned int) b_dynamic & 0x1f); /* number of distance codes */
-
- b_dynamic >>= 5;
- k_dynamic -= 5;
- b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 4);
- nb = 4 + ((unsigned int) 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++) {
- b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 3);
- ll[border[j]] = (unsigned int) 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;
- i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl);
- if (i != 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 int) i < n) {
- b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, (unsigned int)bl);
- j = (td = tl + ((unsigned int) 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 */
- b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 2);
- j = 3 + ((unsigned int) b_dynamic & 3);
- b_dynamic >>= 2;
- k_dynamic -= 2;
- if ((unsigned int) i + j > n) {
- return 1;
- }
- while (j--) {
- ll[i++] = l;
- }
- } else if (j == 17) { /* 3 to 10 zero length codes */
- b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 3);
- j = 3 + ((unsigned int) b_dynamic & 7);
- b_dynamic >>= 3;
- k_dynamic -= 3;
- if ((unsigned int) i + j > n) {
- return 1;
- }
- while (j--) {
- ll[i++] = 0;
- }
- l = 0;
- } else { /* j == 18: 11 to 138 zero length codes */
- b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 7);
- j = 11 + ((unsigned int) b_dynamic & 0x7f);
- b_dynamic >>= 7;
- k_dynamic -= 7;
- if ((unsigned int) 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 */
- gunzip_bb = b_dynamic;
- gunzip_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) {
- bb_error_msg_and_die("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) {
- bb_error_msg_and_die("incomplete distance tree");
- huft_free(td);
- }
- huft_free(tl);
- return i; /* incomplete code set */
- }
-
- /* decompress until an end-of-block code */
- inflate_codes(tl, td, bl, bd, 1); // Setup inflate_codes
-
- /* huft_free code moved into inflate_codes */
-
- return -2;
- }
- default:
- /* bad block type */
- bb_error_msg_and_die("bad block type %d\n", t);
- }
-}
-
-static void calculate_gunzip_crc(void)
-{
- int n;
- for (n = 0; n < gunzip_outbuf_count; n++) {
- gunzip_crc = gunzip_crc_table[((int) gunzip_crc ^ (gunzip_window[n])) & 0xff] ^ (gunzip_crc >> 8);
- }
- gunzip_bytes_out += gunzip_outbuf_count;
-}
-
-static int inflate_get_next_window(void)
-{
- static int method = -1; // Method == -1 for stored, -2 for codes
- static int e = 0;
- static int needAnotherBlock = 1;
-
- gunzip_outbuf_count = 0;
-
- while(1) {
- int ret;
-
- if (needAnotherBlock) {
- if(e) {
- calculate_gunzip_crc();
- e = 0;
- needAnotherBlock = 1;
- return 0;
- } // Last block
- method = inflate_block(&e);
- needAnotherBlock = 0;
- }
-
- switch (method) {
- case -1: ret = inflate_stored(0,0,0,0);
- break;
- case -2: ret = inflate_codes(0,0,0,0,0);
- break;
- default: bb_error_msg_and_die("inflate error %d", method);
- }
-
- if (ret == 1) {
- calculate_gunzip_crc();
- return 1; // More data left
- } else needAnotherBlock = 1; // End of that block
- }
- /* Doesnt get here */
-}
-
-/* Initialise bytebuffer, be carefull not to overfill the buffer */
-extern void inflate_init(unsigned int bufsize)
-{
- /* Set the bytebuffer size, default is same as gunzip_wsize */
- bytebuffer_max = bufsize + 8;
- bytebuffer_offset = 4;
- bytebuffer_size = 0;
-}
-
-extern int inflate_unzip(int in, int out)
-{
- ssize_t nwrote;
- typedef void (*sig_type) (int);
-
- /* Allocate all global buffers (for DYN_ALLOC option) */
- gunzip_window = xmalloc(gunzip_wsize);
- gunzip_outbuf_count = 0;
- gunzip_bytes_out = 0;
- gunzip_src_fd = in;
-
- /* initialize gunzip_window, bit buffer */
- gunzip_bk = 0;
- gunzip_bb = 0;
-
- /* Create the crc table */
- make_gunzip_crc_table();
-
- /* Allocate space for buffer */
- bytebuffer = xmalloc(bytebuffer_max);
-
- while(1) {
- int ret = inflate_get_next_window();
- nwrote = bb_full_write(out, gunzip_window, gunzip_outbuf_count);
- if (nwrote == -1) {
- bb_perror_msg("write");
- return -1;
- }
- if (ret == 0) break;
- }
-
- /* Cleanup */
- free(gunzip_window);
- free(gunzip_crc_table);
-
- /* Store unused bytes in a global buffer so calling applets can access it */
- if (gunzip_bk >= 8) {
- /* Undo too much lookahead. The next read will be byte aligned
- * so we can discard unused bits in the last meaningful byte. */
- bytebuffer_offset--;
- bytebuffer[bytebuffer_offset] = gunzip_bb & 0xff;
- gunzip_bb >>= 8;
- gunzip_bk -= 8;
- }
- return 0;
-}
-
-extern int inflate_gunzip(int in, int out)
-{
- unsigned int stored_crc = 0;
- unsigned char count;
-
- inflate_unzip(in, out);
-
- /* top up the input buffer with the rest of the trailer */
- count = bytebuffer_size - bytebuffer_offset;
- if (count < 8) {
- bb_xread_all(in, &bytebuffer[bytebuffer_size], 8 - count);
- bytebuffer_size += 8 - count;
- }
- for (count = 0; count != 4; count++) {
- stored_crc |= (bytebuffer[bytebuffer_offset] << (count * 8));
- bytebuffer_offset++;
- }
-
- /* Validate decompression - crc */
- if (stored_crc != (gunzip_crc ^ 0xffffffffL)) {
- bb_error_msg("crc error");
- }
-
- /* Validate decompression - size */
- if (gunzip_bytes_out !=
- (bytebuffer[bytebuffer_offset] | (bytebuffer[bytebuffer_offset+1] << 8) |
- (bytebuffer[bytebuffer_offset+2] << 16) | (bytebuffer[bytebuffer_offset+3] << 24))) {
- bb_error_msg("Incorrect length");
- }
-
- return 0;
-}
projects / oweals / busybox.git / commitdiff