* 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 {
} 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 */
-
-/* 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_window size--must be a power of two, and
+ * at least 32K for zip's deflate method */
+ GUNZIP_WSIZE = 0x8000,
+ /* If BMAX needs to be larger than 16, then h and x[] should be ulg. */
+ BMAX = 16, /* maximum bit length of any code (16 for explode) */
+ N_MAX = 288, /* maximum number of codes in any set */
+};
-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;
+/* This is somewhat complex-looking arrangement, but it allows
+ * to place decompressor state either in bss or in
+ * malloc'ed space simply by changing #defines below.
+ * Sizes on i386:
+ * text data bss dec hex
+ * 5256 0 108 5364 14f4 - bss
+ * 4915 0 0 4915 1333 - malloc
+ */
+#define STATE_IN_BSS 0
+#define STATE_IN_MALLOC 1
+
+
+typedef struct state_t {
+ off_t gunzip_bytes_out; /* number of output bytes */
+ uint32_t gunzip_crc;
+
+ int gunzip_src_fd;
+ unsigned gunzip_outbuf_count; /* bytes in output buffer */
+
+ unsigned char *gunzip_window;
+
+ uint32_t *gunzip_crc_table;
+
+ /* bitbuffer */
+ unsigned gunzip_bb; /* bit buffer */
+ unsigned char gunzip_bk; /* bits in bit buffer */
+
+ /* These control the size of the STATE()bytebuffer */
+ unsigned bytebuffer_max;
+ unsigned char *bytebuffer;
+ unsigned bytebuffer_offset;
+ unsigned bytebuffer_size;
+
+ /* private data of inflate_codes() */
+ unsigned inflate_codes_ml; /* masks for bl and bd bits */
+ unsigned inflate_codes_md; /* masks for bl and bd bits */
+ unsigned inflate_codes_bb; /* bit buffer */
+ unsigned inflate_codes_k; /* number of bits in bit buffer */
+ unsigned inflate_codes_w; /* current gunzip_window position */
+ huft_t *inflate_codes_tl;
+ huft_t *inflate_codes_td;
+ unsigned inflate_codes_bl;
+ unsigned inflate_codes_bd;
+ unsigned inflate_codes_nn; /* length and index for copy */
+ unsigned inflate_codes_dd;
+ smallint resume_copy;
+
+ /* private data of inflate_get_next_window() */
+ smallint method; /* Method == -1 for stored, -2 for codes */
+ smallint need_another_block;
+ smallint end_reached;
+
+ /* private data of inflate_stored() */
+ unsigned inflate_stored_n;
+ unsigned inflate_stored_b;
+ unsigned inflate_stored_k;
+ unsigned inflate_stored_w;
+} state_t;
+#define gunzip_bytes_out (S()gunzip_bytes_out )
+#define gunzip_crc (S()gunzip_crc )
+#define gunzip_src_fd (S()gunzip_src_fd )
+#define gunzip_outbuf_count (S()gunzip_outbuf_count)
+#define gunzip_window (S()gunzip_window )
+#define gunzip_crc_table (S()gunzip_crc_table )
+#define gunzip_bb (S()gunzip_bb )
+#define gunzip_bk (S()gunzip_bk )
+#define bytebuffer_max (S()bytebuffer_max )
+#define bytebuffer (S()bytebuffer )
+#define bytebuffer_offset (S()bytebuffer_offset )
+#define bytebuffer_size (S()bytebuffer_size )
+#define inflate_codes_ml (S()inflate_codes_ml )
+#define inflate_codes_md (S()inflate_codes_md )
+#define inflate_codes_bb (S()inflate_codes_bb )
+#define inflate_codes_k (S()inflate_codes_k )
+#define inflate_codes_w (S()inflate_codes_w )
+#define inflate_codes_tl (S()inflate_codes_tl )
+#define inflate_codes_td (S()inflate_codes_td )
+#define inflate_codes_bl (S()inflate_codes_bl )
+#define inflate_codes_bd (S()inflate_codes_bd )
+#define inflate_codes_nn (S()inflate_codes_nn )
+#define inflate_codes_dd (S()inflate_codes_dd )
+#define resume_copy (S()resume_copy )
+#define method (S()method )
+#define need_another_block (S()need_another_block )
+#define end_reached (S()end_reached )
+#define inflate_stored_n (S()inflate_stored_n )
+#define inflate_stored_b (S()inflate_stored_b )
+#define inflate_stored_k (S()inflate_stored_k )
+#define inflate_stored_w (S()inflate_stored_w )
+#define INIT_STATE ({ bytebuffer_size = 0; method = -1; need_another_block = 1; })
+
+
+/* This is generic part */
+#if STATE_IN_BSS /* Use global data segment */
+#define DECLARE_STATE /*nothing*/
+#define ALLOC_STATE (init_state())
+#define DEALLOC_STATE ((void)0)
+#define S() state.
+#define PASS_STATE /*nothing*/
+#define PASS_STATE_ONLY /*nothing*/
+#define STATE_PARAM /*nothing*/
+#define STATE_PARAM_ONLY void
+static state_t state;
+static void init_state(void)
+{
+ INIT_STATE;
+}
+#endif
-/* 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 */
+#if STATE_IN_MALLOC /* Use malloc space */
+#define DECLARE_STATE state_t *state
+#define ALLOC_STATE (state = alloc_state())
+#define DEALLOC_STATE free(state)
+#define S() state->
+#define PASS_STATE state,
+#define PASS_STATE_ONLY state
+#define STATE_PARAM state_t *state,
+#define STATE_PARAM_ONLY state_t *state
+static state_t* alloc_state(void)
+{
+ state_t* state = xzalloc(sizeof(*state));
+ INIT_STATE;
+ return state;
+}
+#endif
-static unsigned int gunzip_hufts; /* track memory usage */
-static unsigned int gunzip_bb; /* bit buffer */
-static unsigned char gunzip_bk; /* bits in bit buffer */
static const unsigned short mask_bits[] = {
0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
/* 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
-}; /* 99==invalid */
+ 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. */
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)
+static unsigned fill_bitbuffer(STATE_PARAM unsigned bitbuffer, unsigned *current, const unsigned 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() */
+ bytebuffer_size = safe_read(gunzip_src_fd, &bytebuffer[4], bytebuffer_max - 8);
+ if (1 > bytebuffer_size)
+//shouldn't we propagate error?
+ bb_error_msg_and_die("unexpected end of file");
+ bytebuffer_size += 4;
+ bytebuffer_offset = 4;
+ }
+ bitbuffer |= ((unsigned) 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;
- }
+ 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)
+static void huft_free(huft_t * p)
{
- huft_t *p;
huft_t *q;
/* Go through linked list, freeing from the malloced (t[-1]) address. */
- p = t;
- while (p != (huft_t *) NULL) {
+ while (p) {
q = (--p)->v.t;
- free((char *) p);
+ free(p);
p = q;
}
- return 0;
}
/* Given a list of code lengths and a maximum table size, make a set of
* 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 *b, const unsigned n,
+ const unsigned s, const unsigned short *d,
+ const unsigned char *e, huft_t ** t, unsigned *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(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 */
- *t = (huft_t *) NULL;
+ if (c[0] == n) { /* null input--all zero length codes */
+ *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 */
+ y -= c[j];
+ if (y < 0) {
+ return 2; /* bad input: more codes than bits */
}
}
- if ((y -= c[i]) < 0) {
+ y -= c[i];
+ if (y < 0) {
return 2;
}
c[i] += y;
x[1] = j = 0;
p = c + 1;
xp = x + 2;
- while (--i) { /* note that i == g from above */
- *xp++ = (j += *p++);
+ while (--i) { /* note that i == g from above */
+ j += *p++;
+ *xp++ = j;
}
/* Make a table of values in order of bit lengths */
p = b;
i = 0;
do {
- if ((j = *p++) != 0) {
+ j = *p++;
+ if (j != 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 */
+ 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] = NULL; /* just to keep compilers happy */
+ q = NULL; /* 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 = g - w;
+ z = z > *m ? *m : z; /* upper limit on table size */
+ j = k - w;
+ f = 1 << j;
+ if (f > 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 */
+ while (++j < z) { /* try smaller tables up to z bits */
+ f <<= 1;
+ if (f <= *++xp) {
+ 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 = 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 actual size of base table */
+ *m = ws[1];
+
/* 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;
-
- 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;
-}
/*
* inflate (decompress) the codes in a deflated (compressed) block.
* 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)
+/* called once from inflate_block */
+
+/* map formerly local static variables to globals */
+#define ml inflate_codes_ml
+#define md inflate_codes_md
+#define bb inflate_codes_bb
+#define k inflate_codes_k
+#define w inflate_codes_w
+#define tl inflate_codes_tl
+#define td inflate_codes_td
+#define bl inflate_codes_bl
+#define bd inflate_codes_bd
+#define nn inflate_codes_nn
+#define dd inflate_codes_dd
+static void inflate_codes_setup(STATE_PARAM huft_t * my_tl, huft_t * my_td, const unsigned my_bl, const unsigned my_bd)
{
- 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;
-
+ tl = my_tl;
+ td = my_td;
+ bl = my_bl;
+ bd = my_bd;
+ /* make local copies of globals */
+ bb = 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];
+}
+/* called once from inflate_get_next_window */
+static int inflate_codes(STATE_PARAM_ONLY)
+{
+ unsigned e; /* table entry flag/number of extra bits */
+ huft_t *t; /* pointer to table entry */
+
+ if (resume_copy) 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)
+ bb = fill_bitbuffer(PASS_STATE bb, &k, bl);
+ t = tl + ((unsigned) bb & ml);
+ e = t->e;
+ if (e > 16)
do {
if (e == 99) {
- return 1;
+//shouldn't we propagate error?
+ bb_error_msg_and_die("inflate_codes error 1");
}
- b >>= t->b;
+ bb >>= 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;
+ bb = fill_bitbuffer(PASS_STATE bb, &k, e);
+ t = t->v.t + ((unsigned) bb & mask_bits[e]);
+ e = t->e;
+ } while (e > 16);
+ bb >>= 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);
+ if (w == GUNZIP_WSIZE) {
+ gunzip_outbuf_count = w;
//flush_gunzip_window();
w = 0;
- return -1;
+ 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;
+ bb = fill_bitbuffer(PASS_STATE bb, &k, e);
+ nn = t->v.n + ((unsigned) bb & mask_bits[e]);
+ bb >>= e;
k -= e;
/* decode distance of block to copy */
- b = fill_bitbuffer(b, &k, bd);
- if ((e = (t = td + ((unsigned) b & md))->e) > 16)
+ bb = fill_bitbuffer(PASS_STATE bb, &k, bd);
+ t = td + ((unsigned) bb & md);
+ e = t->e;
+ if (e > 16)
do {
if (e == 99)
- return 1;
- b >>= t->b;
+//shouldn't we propagate error?
+ bb_error_msg_and_die("inflate_codes error 2");
+ bb >>= 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;
+ bb = fill_bitbuffer(PASS_STATE bb, &k, e);
+ t = t->v.t + ((unsigned) bb & mask_bits[e]);
+ e = t->e;
+ } while (e > 16);
+ bb >>= t->b;
k -= t->b;
- b = fill_bitbuffer(b, &k, e);
- d = w - t->v.n - ((unsigned) b & mask_bits[e]);
- b >>= e;
+ bb = fill_bitbuffer(PASS_STATE bb, &k, e);
+ dd = w - t->v.n - ((unsigned) bb & mask_bits[e]);
+ bb >>= 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);
+ do_copy:
+ do {
+ /* Was: nn -= (e = (e = GUNZIP_WSIZE - ((dd &= GUNZIP_WSIZE - 1) > w ? dd : w)) > nn ? nn : e); */
+ /* Who wrote THAT?? rewritten as: */
+ dd &= GUNZIP_WSIZE - 1;
+ e = GUNZIP_WSIZE - (dd > w ? dd : w);
+ if (e > nn) e = nn;
+ nn -= e;
+
+ /* copy to new buffer to prevent possible overwrite */
+ if (w - dd >= e) { /* (this test assumes unsigned comparison) */
+ memcpy(gunzip_window + w, gunzip_window + dd, e);
w += e;
- d += e;
+ dd += e;
} else {
- /* do it slow to avoid memcpy() overlap */
- /* !NOMEMCPY */
+ /* do it slow to avoid memcpy() overlap */
+ /* !NOMEMCPY */
do {
- gunzip_window[w++] = gunzip_window[d++];
+ gunzip_window[w++] = gunzip_window[dd++];
} while (--e);
}
- if (w == gunzip_wsize) {
- gunzip_outbuf_count = (w);
- if (n) resumeCopy = 1;
- else resumeCopy = 0;
+ if (w == GUNZIP_WSIZE) {
+ gunzip_outbuf_count = w;
+ resume_copy = (nn != 0);
//flush_gunzip_window();
w = 0;
- return -1;
+ return 1;
}
- } while (n);
- resumeCopy = 0;
+ } while (nn);
+ resume_copy = 0;
}
}
/* restore the globals from the locals */
- gunzip_outbuf_count = w; /* restore global gunzip_window pointer */
- gunzip_bb = b; /* restore global bit buffer */
+ gunzip_outbuf_count = w; /* restore global gunzip_window pointer */
+ gunzip_bb = bb; /* 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;
}
-
-int inflate_stored(int my_n, int my_b_stored, int my_k_stored, int setup)
+#undef ml
+#undef md
+#undef bb
+#undef k
+#undef w
+#undef tl
+#undef td
+#undef bl
+#undef bd
+#undef nn
+#undef dd
+
+
+/* called once from inflate_block */
+static void inflate_stored_setup(STATE_PARAM int my_n, int my_b, int my_k)
+{
+ inflate_stored_n = my_n;
+ inflate_stored_b = my_b;
+ inflate_stored_k = my_k;
+ /* initialize gunzip_window position */
+ inflate_stored_w = gunzip_outbuf_count;
+}
+/* called once from inflate_get_next_window */
+static int inflate_stored(STATE_PARAM_ONLY)
{
- 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);
+ while (inflate_stored_n--) {
+ inflate_stored_b = fill_bitbuffer(PASS_STATE inflate_stored_b, &inflate_stored_k, 8);
+ gunzip_window[inflate_stored_w++] = (unsigned char) inflate_stored_b;
+ if (inflate_stored_w == GUNZIP_WSIZE) {
+ gunzip_outbuf_count = inflate_stored_w;
//flush_gunzip_window();
- w = 0;
- b_stored >>= 8;
- k_stored -= 8;
- return -1; // Means more stuff 2do
+ inflate_stored_w = 0;
+ inflate_stored_b >>= 8;
+ inflate_stored_k -= 8;
+ return 1; // We have a block
}
- b_stored >>= 8;
- k_stored -= 8;
+ inflate_stored_b >>= 8;
+ inflate_stored_k -= 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;
+ gunzip_outbuf_count = inflate_stored_w; /* restore global gunzip_window pointer */
+ gunzip_bb = inflate_stored_b; /* restore global bit buffer */
+ gunzip_bk = inflate_stored_k;
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)
+/* Return values: -1 = inflate_stored, -2 = inflate_codes */
+/* One callsite in inflate_get_next_window */
+static int inflate_block(STATE_PARAM smallint *e)
{
unsigned t; /* block type */
- register unsigned int b; /* bit buffer */
- unsigned int k; /* number of bits in bit buffer */
+ unsigned b; /* bit buffer */
+ unsigned k; /* number of bits in bit buffer */
/* make local bit buffer */
k = gunzip_bk;
/* read in last block bit */
- b = fill_bitbuffer(b, &k, 1);
- *e = (int) b & 1;
+ b = fill_bitbuffer(PASS_STATE b, &k, 1);
+ *e = b & 1;
b >>= 1;
k -= 1;
/* read in block type */
- b = fill_bitbuffer(b, &k, 2);
+ b = fill_bitbuffer(PASS_STATE b, &k, 2);
t = (unsigned) b & 3;
b >>= 2;
k -= 2;
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 */
+ unsigned n; /* number of bytes in block */
+ unsigned b_stored; /* bit buffer */
+ unsigned k_stored; /* number of bits in bit buffer */
/* make local copies of globals */
b_stored = gunzip_bb; /* initialize bit buffer */
k_stored -= n;
/* get the length and its complement */
- b_stored = fill_bitbuffer(b_stored, &k_stored, 16);
+ b_stored = fill_bitbuffer(PASS_STATE 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);
+ b_stored = fill_bitbuffer(PASS_STATE 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
+ inflate_stored_setup(PASS_STATE n, b_stored, k_stored); // 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.
- */
+ 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 */
+ unsigned bl; /* lookup bits for tl */
+ unsigned bd; /* lookup bits for td */
+ unsigned l[288]; /* length list for huft_build */
/* set up literal table */
for (i = 0; i < 144; i++) {
l[i] = 8;
}
bl = 7;
- if ((i = huft_build(l, 288, 257, cplens, cplext, &tl, &bl)) != 0) {
+ i = huft_build(l, 288, 257, cplens, cplext, &tl, &bl);
+ if (i != 0) {
return i;
}
l[i] = 5;
}
bd = 5;
- if ((i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd)) > 1) {
+ i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd);
+ if (i > 1) {
huft_free(tl);
return i;
}
/* decompress until an end-of-block code */
- inflate_codes(tl, td, bl, bd, 1); // Setup inflate_codes
-
+ inflate_codes_setup(PASS_STATE tl, td, bl, bd); // Setup inflate_codes
+
/* huft_free code moved into inflate_codes */
-
+
return -2;
}
case 2: /* Inflate dynamic */
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 */
+ unsigned i; /* temporary variables */
+ unsigned j;
+ unsigned l; /* last length */
+ unsigned m; /* mask for bit lengths table */
+ unsigned n; /* number of lengths to get */
+ unsigned bl; /* lookup bits for tl */
+ unsigned bd; /* lookup bits for td */
+ unsigned nb; /* number of bit length codes */
+ unsigned nl; /* number of literal/length codes */
+ unsigned nd; /* number of distance codes */
+
+ unsigned ll[286 + 30]; /* literal/length and distance code lengths */
+ unsigned b_dynamic; /* bit buffer */
+ unsigned 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 = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 5);
+ nl = 257 + ((unsigned) 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 = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 5);
+ nd = 1 + ((unsigned) 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 = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 4);
+ nb = 4 + ((unsigned) b_dynamic & 0xf); /* number of bit length codes */
b_dynamic >>= 4;
k_dynamic -= 4;
/* 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 = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 3);
+ ll[border[j]] = (unsigned) b_dynamic & 7;
b_dynamic >>= 3;
k_dynamic -= 3;
}
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;
+ while ((unsigned) i < n) {
+ b_dynamic = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, (unsigned)bl);
+ 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 */
- b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 2);
- j = 3 + ((unsigned int) b_dynamic & 3);
+ b_dynamic = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 2);
+ j = 3 + ((unsigned) b_dynamic & 3);
b_dynamic >>= 2;
k_dynamic -= 2;
- if ((unsigned int) i + j > n) {
+ if ((unsigned) 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 = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 3);
+ j = 3 + ((unsigned) b_dynamic & 7);
b_dynamic >>= 3;
k_dynamic -= 3;
- if ((unsigned int) i + j > n) {
+ if ((unsigned) i + j > n) {
return 1;
}
while (j--) {
}
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 = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 7);
+ j = 11 + ((unsigned) b_dynamic & 0x7f);
b_dynamic >>= 7;
k_dynamic -= 7;
- if ((unsigned int) i + j > n) {
+ if ((unsigned) i + j > n) {
return 1;
}
while (j--) {
/* build the decoding tables for literal/length and distance codes */
bl = lbits;
- if ((i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl)) != 0) {
+ i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl);
+ if (i != 0) {
if (i == 1) {
- error_msg_and_die("Incomplete literal tree");
- huft_free(tl);
+//shouldn't we propagate error?
+ 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) {
+ i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd);
+ if (i != 0) {
if (i == 1) {
- error_msg_and_die("incomplete distance tree");
- huft_free(td);
+//shouldn't we propagate error?
+ 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
+ inflate_codes_setup(PASS_STATE tl, td, bl, bd); // Setup inflate_codes
/* huft_free code moved into inflate_codes */
-
+
return -2;
}
default:
/* bad block type */
- error_msg("bad block type %d\n", t);
- return 2;
+//shouldn't we propagate error?
+ bb_error_msg_and_die("bad block type %d", t);
}
}
-/*
- * decompress an inflated entry
- *
- * GLOBAL VARIABLES: gunzip_outbuf_count, bk, gunzip_bb, hufts, inptr
- */
+/* Two callsites, both in inflate_get_next_window */
+static void calculate_gunzip_crc(STATE_PARAM_ONLY)
+{
+ 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)
+/* One callsite in inflate_unzip_internal */
+static int inflate_get_next_window(STATE_PARAM_ONLY)
{
- 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 == -1) { // Call inflate_stored while returning -1
- while(inflate_stored(0,0,0,0) == -1) flush_gunzip_window();
- } else if (r == -2) { // Call inflate_codes while returning -1
- while(inflate_codes(0,0,0,0,0) == -1) flush_gunzip_window();
- } else {
- error_msg_and_die("inflate error %d", r);
- return -1;
+ gunzip_outbuf_count = 0;
+
+ while (1) {
+ int ret;
+
+ if (need_another_block) {
+ if (end_reached) {
+ calculate_gunzip_crc(PASS_STATE_ONLY);
+ end_reached = 0;
+ need_another_block = 1;
+ return 0; /* Last block */
+ }
+ method = inflate_block(PASS_STATE &end_reached);
+ need_another_block = 0;
}
- if (gunzip_hufts > h) {
- h = gunzip_hufts;
+
+ switch (method) {
+ case -1:
+ ret = inflate_stored(PASS_STATE_ONLY);
+ break;
+ case -2:
+ ret = inflate_codes(PASS_STATE_ONLY);
+ break;
+ default:
+//shouldn't we propagate error?
+ bb_error_msg_and_die("inflate error %d", method);
}
- if (e) { // Ok finished uncompressing, get any buffered uncompressed data
- flush_gunzip_window();
+
+ if (ret == 1) {
+ calculate_gunzip_crc(PASS_STATE_ONLY);
+ return 1; // More data left
}
- output_buffer_ptr = output_buffer;
+ need_another_block = 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;
-
- return written;
+ /* Doesnt get here */
}
-extern void GZ_gzReadOpen(int fd, void *unused, int nUnused)
+
+/* Called from inflate_gunzip() and inflate_unzip() */
+/* NB: bytebuffer is allocated here but freeing it is left to the caller! */
+static USE_DESKTOP(long long) int
+inflate_unzip_internal(STATE_PARAM int in, int out)
{
- typedef void (*sig_type) (int);
+ USE_DESKTOP(long long) int n = 0;
+ ssize_t nwrote;
/* Allocate all global buffers (for DYN_ALLOC option) */
- gunzip_window = xmalloc(gunzip_wsize);
- output_buffer = xmalloc(gunzip_wsize);
+ gunzip_window = xmalloc(GUNZIP_WSIZE);
gunzip_outbuf_count = 0;
gunzip_bytes_out = 0;
- gunzip_src_fd = fd;
-
- gunzip_in_buffer = malloc(8);
+ gunzip_src_fd = in;
/* initialize gunzip_window, bit buffer */
gunzip_bk = 0;
gunzip_bb = 0;
/* Create the crc table */
- make_gunzip_crc_table();
-}
-
-extern void GZ_gzReadClose(void)
-{
- /* Cleanup */
- free(gunzip_window);
- free(output_buffer);
- free(gunzip_crc_table);
+ gunzip_crc_table = crc32_filltable(0);
+ gunzip_crc = ~0;
+
+ /* Allocate space for buffer */
+ bytebuffer = xmalloc(bytebuffer_max);
+
+ while (1) {
+ int r = inflate_get_next_window(PASS_STATE_ONLY);
+ nwrote = full_write(out, gunzip_window, gunzip_outbuf_count);
+ if (nwrote != gunzip_outbuf_count) {
+ bb_perror_msg("write");
+ n = -1;
+ goto ret;
+ }
+ USE_DESKTOP(n += nwrote;)
+ if (r == 0) break;
+ }
/* 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;
}
+ ret:
+ /* Cleanup */
+ free(gunzip_window);
+ free(gunzip_crc_table);
+ return n;
}
-extern int inflate(int in, int out)
+
+USE_DESKTOP(long long) int
+inflate_unzip(inflate_unzip_result *res, unsigned bufsize, 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;
+ USE_DESKTOP(long long) int n;
+ DECLARE_STATE;
+
+ ALLOC_STATE;
+
+ bytebuffer_max = bufsize + 8;
+ bytebuffer_offset = 4;
+ n = inflate_unzip_internal(PASS_STATE in, out);
+
+ res->crc = gunzip_crc;
+ res->bytes_out = gunzip_bytes_out;
+ free(bytebuffer);
+ DEALLOC_STATE;
+ return n;
+}
+
+
+USE_DESKTOP(long long) int
+inflate_gunzip(int in, int out)
+{
+ uint32_t stored_crc = 0;
+ unsigned count;
+ USE_DESKTOP(long long) int n;
+ DECLARE_STATE;
+
+ ALLOC_STATE;
+
+ bytebuffer_max = 0x8000;
+ n = inflate_unzip_internal(PASS_STATE in, out);
+
+ if (n < 0) goto ret;
+
+ /* 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);
+//shouldn't we propagate error?
+ 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");
+ n = -1;
+ goto ret;
+ }
+
+ /* 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");
+ n = -1;
+ }
+ ret:
+ free(bytebuffer);
+ DEALLOC_STATE;
+ return n;
}
projects / oweals / busybox.git / blobdiff