* Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
* based on gzip sources
*
- * Adjusted further by Erik Andersen <andersee@debian.org> to support
+ * 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>
- *
- * 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.
+ * busybox functions by Glenn McGrath <bug1@iinet.net.au>
*
- * 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
+ * read_gz interface + associated hacking by Laurence Anderson
*
+ * Fixed huft_build() so decoding end-of-block code does not grab more bits
+ * than necessary (this is required by unzip applet), added inflate_cleanup()
+ * to free leaked bytebuffer memory (used in unzip.c), and some minor style
+ * guide cleanups by Ed Clark
*
* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
* Copyright (C) 1992-1993 Jean-loup Gailly
* 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.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#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 "libbb.h"
#include "unarchive.h"
typedef struct huft_s {
unsigned int gunzip_bytes_out; /* number of output bytes */
static unsigned int gunzip_outbuf_count; /* bytes in output buffer */
-/* This is used to sanify any unused bits from the bitbuffer
- * so they arent skipped when reading trailers (trailing headers) */
-unsigned char gunzip_in_buffer_count;
-unsigned char *gunzip_in_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 int output_buffer_size = 0x8000; // gunzip_wsize initially
-
+enum { gunzip_wsize = 0x8000 };
static unsigned char *gunzip_window;
-static unsigned int *gunzip_crc_table;
-unsigned int gunzip_crc;
-static unsigned char *output_buffer;
-static unsigned int output_buffer_len;
+static uint32_t *gunzip_crc_table;
+uint32_t 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 */
-static unsigned int gunzip_hufts; /* track memory usage */
+/* 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
+ 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
+ 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
+ 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
+ 11, 11, 12, 12, 13, 13
};
/* Tables for deflate from PKZIP's appnote.txt. */
static unsigned int fill_bitbuffer(unsigned int bitbuffer, unsigned int *current, const unsigned int required)
{
while (*current < required) {
- bitbuffer |= ((unsigned int) xread_char(gunzip_src_fd)) << *current;
+ 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() */
+ if (1 > (bytebuffer_size = safe_read(gunzip_src_fd, &bytebuffer[4], bytebuffer_max - 8)))
+ bb_error_msg_and_die("unexpected end of file");
+ bytebuffer_size += 4;
+ bytebuffer_offset = 4;
+ }
+ bitbuffer |= ((unsigned int) bytebuffer[bytebuffer_offset]) << *current;
+ bytebuffer_offset++;
*current += 8;
}
-
- return(bitbuffer);
-}
-
-static void abort_gzip(void)
-{
- error_msg("gzip aborted\n");
- exit(-1);
-}
-
-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;
- }
+ return bitbuffer;
}
/*
* 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.
+ * each table.
* t: table to free
*/
static int huft_free(huft_t * t)
* 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)
+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, unsigned int *m)
{
- unsigned a; /* counter for codes of length k */
+ 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 eob_len; /* length of end-of-block code (value 256) */
+ unsigned f; /* i repeats in table every f entries */
+ int g; /* maximum code length */
+ int htl; /* table level */
+ unsigned i; /* counter, current code */
+ unsigned j; /* counter */
+ int k; /* number of bits in current code */
+ unsigned *p; /* pointer into c[], b[], or v[] */
+ huft_t *q; /* points to current table */
+ huft_t r; /* table entry for structure assignment */
+ huft_t *u[BMAX]; /* table stack */
+ unsigned v[N_MAX]; /* values in order of bit length */
+ int ws[BMAX+1]; /* bits decoded stack */
+ int w; /* bits decoded */
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 */
+ unsigned *xp; /* pointer into x */
+ int y; /* number of dummy codes added */
+ unsigned z; /* number of entries in current table */
+
+ /* Length of EOB code, if any */
+ eob_len = n > 256 ? b[256] : BMAX;
/* Generate counts for each bit length */
- memset((void *) (c), 0, sizeof(c));
+ 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) */
+ 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 */
+ if (c[0] == n) { /* null input--all zero length codes */
*t = (huft_t *) NULL;
*m = 0;
- return 0;
+ return 2;
}
/* 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;
+ for (j = 1; (c[j] == 0) && (j <= BMAX); j++);
+ k = j; /* minimum code length */
+ for (i = BMAX; (c[i] == 0) && i; i--);
+ g = i; /* maximum code length */
+ *m = (*m < j) ? j : ((*m > i) ? i : *m);
/* 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 */
+ return 2; /* bad input: more codes than bits */
}
}
if ((y -= c[i]) < 0) {
x[1] = j = 0;
p = c + 1;
xp = x + 2;
- while (--i) { /* note that i == g from above */
+ while (--i) { /* note that i == g from above */
*xp++ = (j += *p++);
}
} 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) */
+ x[0] = i = 0; /* first Huffman code is zero */
+ p = v; /* grab values in bit order */
+ htl = -1; /* no tables yet--level -1 */
+ w = ws[0] = 0; /* bits decoded */
u[0] = (huft_t *) NULL; /* just to keep compilers happy */
q = (huft_t *) NULL; /* ditto */
- z = 0; /* ditto */
+ z = 0; /* ditto */
/* go through the bit lengths (k already is bits in shortest code) */
for (; k <= g; 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 */
+ while (k > ws[htl + 1]) {
+ w = ws[++htl];
+
+ /* compute minimum size table less than or equal to *m bits */
+ z = (z = g - w) > *m ? *m : 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 */
+ while (++j < z) { /* try smaller tables up to z bits */
if ((f <<= 1) <= *++xp) {
- break; /* enough codes to use up j bits */
+ break; /* enough codes to use up j bits */
}
- f -= *xp; /* else deduct codes from patterns */
+ f -= *xp; /* else deduct codes from patterns */
}
}
+ j = (w + j > eob_len && w < eob_len) ? eob_len - w : j; /* make EOB code end at table */
z = 1 << j; /* table entries for j-bit table */
+ ws[htl+1] = w + j; /* set bits decoded in stack */
/* allocate and link in new table */
- q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t));
-
- gunzip_hufts += z + 1; /* track memory usage */
+ q = (huft_t *) xzalloc((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 */
+ t = &(q->v.t);
+ u[htl] = ++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 */
+ if (htl) {
+ x[htl] = i; /* save pattern for backing up */
+ r.b = (unsigned char) (w - ws[htl - 1]); /* 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 & ((1 << w) - 1)) >> ws[htl - 1];
+ u[htl - 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 */
+ 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++ */
+ r.e = (unsigned char) (*p < 256 ? 16 : 15); /* 256 is EOB code */
+ r.v.n = (unsigned short) (*p++); /* simple code is just the value */
} else {
- r.e = (unsigned char) e[*p - s]; /* non-simple--look up in lists */
+ r.e = (unsigned char) e[*p - s]; /* non-simple--look up in lists */
r.v.n = d[*p++ - s];
}
i ^= j;
/* backup over finished tables */
- while ((i & ((1 << w) - 1)) != x[h]) {
- h--; /* don't need to update q */
- w -= l;
+ while ((i & ((1 << w) - 1)) != x[htl]) {
+ w = ws[--htl];
}
}
}
- /* Return true (1) if we were given an incomplete table */
- return y != 0 && g != 1;
-}
-/* ===========================================================================
- * Write the output gunzip_window gunzip_window[0..gunzip_outbuf_count-1] and update crc and gunzip_bytes_out.
- * (Used for the decompressed data only.)
- */
-static void flush_gunzip_window(void)
-{
- int n;
+ /* return actual size of base table */
+ *m = ws[1];
- for (n = 0; n < gunzip_outbuf_count; n++) {
- gunzip_crc = gunzip_crc_table[((int) gunzip_crc ^ (gunzip_window[n])) & 0xff] ^ (gunzip_crc >> 8);
- }
-
- if (output_buffer_len == 0) { // Our buffer is empty -> straight memcpy
- memcpy(output_buffer, gunzip_window, gunzip_outbuf_count);
- output_buffer_len = gunzip_outbuf_count;
- } else { // Bit more complicated, append to end of output_buffer, realloc as necessary
- int newlen = output_buffer_len + gunzip_outbuf_count;
- if (newlen > output_buffer_size) {
- output_buffer = xrealloc(output_buffer, newlen); // Could free later, but as we now have the memory...
- //printf("Using %d byte output buffer\n", newlen);
- output_buffer_size = newlen;
- }
- memcpy(output_buffer + output_buffer_len, gunzip_window, gunzip_outbuf_count);
- output_buffer_len += gunzip_outbuf_count;
- }
-
- gunzip_bytes_out += gunzip_outbuf_count;
- gunzip_outbuf_count = 0;
+ /* Return true (1) if we were given an incomplete table */
+ return y != 0 && g != 1;
}
/*
* 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, const unsigned int bl, const unsigned int bd)
+static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned int my_bl, const unsigned int my_bd, int setup)
{
- unsigned int e; /* table entry flag/number of extra bits */
- unsigned int n, d; /* length and index for copy */
- unsigned int w; /* current gunzip_window position */
- huft_t *t; /* pointer to table entry */
- unsigned int ml, md; /* masks for bl and bd bits */
- unsigned int b; /* bit buffer */
- unsigned int k; /* number of bits in bit buffer */
+ 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
+ }
- /* make local copies of globals */
- b = gunzip_bb; /* initialize bit buffer */
- k = gunzip_bk;
- w = gunzip_outbuf_count; /* initialize gunzip_window position */
+ if (resumeCopy) goto do_copy;
- /* inflate the coded data */
- ml = mask_bits[bl]; /* precompute masks for speed */
- md = mask_bits[bd];
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) {
- return 1;
+ bb_error_msg_and_die("inflate_codes error 1");
}
b >>= t->b;
k -= t->b;
gunzip_window[w++] = (unsigned char) t->v.n;
if (w == gunzip_wsize) {
gunzip_outbuf_count = (w);
- flush_gunzip_window();
+ //flush_gunzip_window();
w = 0;
+ return 1; // We have a block to read
}
} else { /* it's an EOB or a length */
if ((e = (t = td + ((unsigned) b & md))->e) > 16)
do {
if (e == 99)
- return 1;
+ bb_error_msg_and_die("inflate_codes error 2");
b >>= t->b;
k -= t->b;
e -= 16;
k -= e;
/* do the copy */
- do {
+do_copy: do {
n -= (e =
(e =
gunzip_wsize - ((d &= gunzip_wsize - 1) > w ? d : w)) > n ? n : e);
}
if (w == gunzip_wsize) {
gunzip_outbuf_count = (w);
- flush_gunzip_window();
+ if (n) resumeCopy = 1;
+ else resumeCopy = 0;
+ //flush_gunzip_window();
w = 0;
+ return 1;
}
-
} while (n);
+ resumeCopy = 0;
}
}
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 unsigned 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 == 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 b; /* bit buffer */
unsigned int k; /* number of bits in bit buffer */
/* make local bit buffer */
case 0: /* Inflate stored */
{
unsigned int n; /* number of bytes in block */
- unsigned int w; /* current gunzip_window position */
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;
- w = gunzip_outbuf_count; /* initialize gunzip_window position */
/* go to byte boundary */
n = k_stored & 7;
b_stored >>= 16;
k_stored -= 16;
- /* 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;
- }
-
- /* 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;
+ inflate_stored(n, b_stored, k_stored, 1); // Setup inflate_stored
+ return -1;
}
- case 1: /* Inflate fixed
+ 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.
}
/* decompress until an end-of-block code */
- if (inflate_codes(tl, td, bl, bd)) {
- return 1;
- }
+ inflate_codes(tl, td, bl, bd, 1); // Setup inflate_codes
- /* free the decoding tables, return */
- huft_free(tl);
- huft_free(td);
- return 0;
+ /* huft_free code moved into inflate_codes */
+
+ return -2;
}
case 2: /* Inflate dynamic */
{
if ((i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl)) != 0) {
if (i == 1) {
- error_msg_and_die("Incomplete literal tree");
+ 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) {
- error_msg_and_die("incomplete distance tree");
+ bb_error_msg_and_die("incomplete distance tree");
huft_free(td);
}
huft_free(tl);
}
/* decompress until an end-of-block code */
- if (inflate_codes(tl, td, bl, bd)) {
- return 1;
- }
+ inflate_codes(tl, td, bl, bd, 1); // Setup inflate_codes
- /* free the decoding tables, return */
- huft_free(tl);
- huft_free(td);
- return 0;
+ /* huft_free code moved into inflate_codes */
+
+ return -2;
}
default:
/* bad block type */
- error_msg("bad block type %d\n", t);
- return 2;
+ bb_error_msg_and_die("bad block type %d", t);
}
}
-/*
- * decompress an inflated entry
- *
- * GLOBAL VARIABLES: gunzip_outbuf_count, bk, gunzip_bb, hufts, inptr
- */
+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;
+}
-extern ssize_t read_gz(int fd, void *buf, size_t count)
+static int inflate_get_next_window(void)
{
- static int e = 0; /* last block flag */
- int r; /* result code */
- unsigned h = 0; /* maximum struct huft's malloc'ed */
- ssize_t written = count;
- static char *output_buffer_ptr = 0;
-
- while (output_buffer_len == 0) { // We need more data
- if (e) return 0; // No more data here!
- gunzip_hufts = 0;
- r = inflate_block(&e);
- if (r != 0) {
- error_msg_and_die("inflate error %d", r);
- return -1;
- }
- if (gunzip_hufts > h) {
- h = gunzip_hufts;
+ 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;
}
- if (e) { // Ok finished uncompressing, get any buffered uncompressed data
- flush_gunzip_window();
+
+ 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);
}
- output_buffer_ptr = output_buffer;
+
+ if (ret == 1) {
+ calculate_gunzip_crc();
+ return 1; // More data left
+ } else needAnotherBlock = 1; // End of that block
}
- if (count > output_buffer_len) written = output_buffer_len; // We're only giving them as much as we have!
- memcpy(buf, output_buffer_ptr, written);
- output_buffer_ptr += written;
- output_buffer_len -= written;
+ /* Doesnt get here */
+}
+
+/* Initialise bytebuffer, be careful not to overfill the buffer */
+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;
+}
- return written;
+void inflate_cleanup(void)
+{
+ free(bytebuffer);
}
-extern void GZ_gzReadOpen(int fd, void *unused, int nUnused)
+USE_DESKTOP(long long) int
+inflate_unzip(int in, int out)
{
+ USE_DESKTOP(long long total = 0;)
+ ssize_t nwrote;
typedef void (*sig_type) (int);
/* Allocate all global buffers (for DYN_ALLOC option) */
gunzip_window = xmalloc(gunzip_wsize);
- output_buffer = xmalloc(gunzip_wsize);
gunzip_outbuf_count = 0;
gunzip_bytes_out = 0;
- gunzip_src_fd = fd;
-
- gunzip_in_buffer = malloc(8);
-
- if (signal(SIGINT, SIG_IGN) != SIG_IGN) {
- (void) signal(SIGINT, (sig_type) abort_gzip);
- }
-#ifdef SIGHUP
- if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
- (void) signal(SIGHUP, (sig_type) abort_gzip);
- }
-#endif
+ gunzip_src_fd = in;
/* initialize gunzip_window, bit buffer */
gunzip_bk = 0;
gunzip_bb = 0;
/* Create the crc table */
- make_gunzip_crc_table();
-}
+ gunzip_crc_table = crc32_filltable(0);
+ gunzip_crc = ~0;
+
+ /* Allocate space for buffer */
+ bytebuffer = xmalloc(bytebuffer_max);
+
+ while(1) {
+ int ret = inflate_get_next_window();
+ nwrote = full_write(out, gunzip_window, gunzip_outbuf_count);
+ if (nwrote == -1) {
+ bb_perror_msg("write");
+ return -1;
+ }
+ USE_DESKTOP(total += nwrote;)
+ if (ret == 0) break;
+ }
-extern void GZ_gzReadClose(void)
-{
/* Cleanup */
free(gunzip_window);
- free(output_buffer);
free(gunzip_crc_table);
/* Store unused bytes in a global buffer so calling applets can access it */
- gunzip_in_buffer_count = 0;
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. */
- gunzip_in_buffer[gunzip_in_buffer_count] = gunzip_bb & 0xff;
- gunzip_in_buffer_count++;
+ bytebuffer_offset--;
+ bytebuffer[bytebuffer_offset] = gunzip_bb & 0xff;
gunzip_bb >>= 8;
gunzip_bk -= 8;
}
+ return USE_DESKTOP(total) + 0;
}
-extern int inflate(int in, int out)
+USE_DESKTOP(long long) int
+inflate_gunzip(int in, int out)
{
- char buf[8192];
- ssize_t nread, nwrote;
- ssize_t total = 0;
-
- GZ_gzReadOpen(in, 0, 0);
- while(1) { // Robbed from copyfd.c
- nread = read_gz(in, buf, sizeof(buf));
- if (nread == 0) break; // no data to write
- else if (nread == -1) {
- perror_msg("read");
- return -1;
- }
- nwrote = full_write(out, buf, nread);
- if (nwrote == -1) {
- perror_msg("write");
- return -1;
- }
- total += nwrote;
+ uint32_t stored_crc = 0;
+ unsigned int count;
+ USE_DESKTOP(long long total = )inflate_unzip(in, out);
+
+ USE_DESKTOP(if (total < 0) return total;)
+
+ /* top up the input buffer with the rest of the trailer */
+ count = bytebuffer_size - bytebuffer_offset;
+ if (count < 8) {
+ xread(in, &bytebuffer[bytebuffer_size], 8 - count);
+ bytebuffer_size += 8 - count;
}
- GZ_gzReadClose();
- return 0;
+ for (count = 0; count != 4; count++) {
+ stored_crc |= (bytebuffer[bytebuffer_offset] << (count * 8));
+ bytebuffer_offset++;
+ }
+
+ /* Validate decompression - crc */
+ if (stored_crc != (~gunzip_crc)) {
+ bb_error_msg("crc error");
+ return -1;
+ }
+
+ /* 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 -1;
+ }
+
+ return USE_DESKTOP(total) + 0;
}
projects / oweals / busybox.git / blobdiff