* 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
#include <signal.h>
#include <stdlib.h>
#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
#include "config.h"
-#include "libbb.h"
+#include "busybox.h"
+#include "unarchive.h"
-#ifdef CONFIG_FEATURE_UNCOMPRESS
-int uncompress(FILE * in, FILE * out);
-#endif
+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 FILE *in_file, *out_file;
+static int gunzip_src_fd;
+unsigned int gunzip_bytes_out; /* number of output bytes */
+static unsigned int gunzip_outbuf_count; /* bytes in output buffer */
-/* these are freed by gz_close */
-static unsigned char *window;
-static unsigned long *crc_table;
+/* 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;
-static unsigned long crc; /* shift register contents */
+/* gunzip_window size--must be a power of two, and
+ * at least 32K for zip's deflate method */
+static const int gunzip_wsize = 0x8000;
-/* Return codes from gzip */
-#define ERROR 1
-
-/*
- * window size--must be a power of two, and
- * at least 32K for zip's deflate method
- */
-#define 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 */
-static long bytes_out; /* number of output bytes */
-static unsigned long outcnt; /* bytes in output buffer */
-
-static unsigned hufts; /* track memory usage */
-static unsigned long bb; /* bit buffer */
-static unsigned bk; /* bits in bit buffer */
-
-typedef struct huft_s {
- unsigned char e; /* number of extra bits or operation */
- unsigned char b; /* number of bits in this code or subcode */
- union {
- unsigned short n; /* literal, length base, or distance base */
- struct huft_s *t; /* pointer to next level of table */
- } v;
-} huft_t;
+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,
+ 0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
};
-/* static int error_number = 0; */
-/* ========================================================================
- * Signal and error handler.
- */
+/* 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
+};
-static void abort_gzip(void)
+/* 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)
{
- error_msg("gzip aborted\n");
- exit(ERROR);
+ while (*current < required) {
+ bitbuffer |= ((unsigned int) xread_char(gunzip_src_fd)) << *current;
+ *current += 8;
+ }
+
+ return(bitbuffer);
}
-static void make_crc_table(void)
+static void make_gunzip_crc_table(void)
{
- const unsigned long poly = 0xedb88320; /* polynomial exclusive-or pattern */
+ const unsigned int poly = 0xedb88320; /* polynomial exclusive-or pattern */
unsigned short i; /* counter for all possible eight bit values */
/* initial shift register value */
- crc = 0xffffffffL;
- crc_table = (unsigned long *) malloc(256 * sizeof(unsigned long));
+ 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 long table_entry; /* crc shift register */
- char k; /* byte being shifted into crc apparatus */
+ 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--) {
- table_entry =
- table_entry & 1 ? (table_entry >> 1) ^ poly : table_entry >>
- 1;
- }
- crc_table[i] = table_entry;
+ if (table_entry & 1) {
+ table_entry = (table_entry >> 1) ^ poly;
+ } else {
+ table_entry >>= 1;
}
-}
-
-/* ===========================================================================
- * Write the output window window[0..outcnt-1] and update crc and bytes_out.
- * (Used for the decompressed data only.)
- */
-static void flush_window(void)
-{
- int n;
-
- if (outcnt == 0)
- return;
-
- for (n = 0; n < outcnt; n++) {
- crc = crc_table[((int) crc ^ (window[n])) & 0xff] ^ (crc >> 8);
}
-
- if (fwrite(window, 1, outcnt, out_file) != outcnt) {
- error_msg_and_die("Couldnt write");
+ gunzip_crc_table[i] = table_entry;
}
- bytes_out += (unsigned long) outcnt;
- outcnt = 0;
}
/*
*/
static int huft_free(huft_t * t)
{
- huft_t *p, *q;
+ huft_t *p;
+ huft_t *q;
/* Go through linked list, freeing from the malloced (t[-1]) address. */
p = t;
return 0;
}
-typedef unsigned char extra_bits_t;
-
/* 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
*/
static int huft_build(unsigned int *b, const unsigned int n,
const unsigned int s, const unsigned short *d,
- const extra_bits_t * e, huft_t ** t, int *m)
+ 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 */
/* Find minimum and maximum length, bound *m by those */
l = *m;
- for (j = 1; j <= BMAX; j++)
- if (c[j])
+ for (j = 1; j <= BMAX; j++) {
+ if (c[j]) {
break;
+ }
+ }
k = j; /* minimum code length */
- if ((unsigned) l < j)
+ if ((unsigned) l < j) {
l = j;
- for (i = BMAX; i; i--)
- if (c[i])
+ }
+ for (i = BMAX; i; i--) {
+ if (c[i]) {
break;
+ }
+ }
g = i; /* maximum code length */
- if ((unsigned) l > i)
+ 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)
+ 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)
+ }
+ }
+ if ((y -= c[i]) < 0) {
return 2;
+ }
c[i] += y;
/* Generate starting offsets into the value table for each length */
p = b;
i = 0;
do {
- if ((j = *p++) != 0)
+ if ((j = *p++) != 0) {
v[x[j]++] = i;
+ }
} while (++i < n);
/* Generate the Huffman codes and for each, make the table entries */
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)
+ if ((f <<= 1) <= *++xp) {
break; /* enough codes to use up j bits */
+ }
f -= *xp; /* else deduct codes from patterns */
}
}
/* allocate and link in new table */
q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t));
- hufts += z + 1; /* track memory usage */
*t = q + 1; /* link to list for huft_free() */
*(t = &(q->v.t)) = NULL;
u[h] = ++q; /* table starts after link */
/* set up table entry in r */
r.b = (unsigned char) (k - w);
- if (p >= v + n)
+ if (p >= v + n) {
r.e = 99; /* out of values--invalid code */
- else if (*p < s) {
+ } 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++ */
/* fill code-like entries with r */
f = 1 << (k - w);
- for (j = i >> w; j < z; j += f)
+ 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)
+ for (j = 1 << (k - 1); i & j; j >>= 1) {
i ^= j;
+ }
i ^= j;
/* backup over finished tables */
* tl, td: literal/length and distance decoder tables
* bl, bd: number of bits decoded by tl[] and td[]
*/
-static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
+static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned int my_bl, const unsigned int my_bd, int setup)
{
- register unsigned long e; /* table entry flag/number of extra bits */
- unsigned long n, d; /* length and index for copy */
- unsigned long w; /* current window position */
- huft_t *t; /* pointer to table entry */
- unsigned ml, md; /* masks for bl and bd bits */
- register unsigned long b; /* bit buffer */
- register unsigned k; /* number of bits in bit buffer */
- register int input_char;
-
- /* make local copies of globals */
- b = bb; /* initialize bit buffer */
- k = bk;
- w = outcnt; /* initialize window position */
-
- /* inflate the coded data */
- ml = mask_bits[bl]; /* precompute masks for speed */
- md = mask_bits[bd];
- for (;;) { /* do until end of block */
- while (k < (unsigned) bl) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b |= ((unsigned long)input_char) << k;
- k += 8;
- }
+ 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) {
- return 1;
+ error_msg_and_die("inflate_codes error 1");;
}
b >>= t->b;
k -= t->b;
e -= 16;
- while (k < e) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b |= ((unsigned long)input_char) << k;
- k += 8;
- }
+ 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 */
- window[w++] = (unsigned char) t->v.n;
- if (w == WSIZE) {
- outcnt = (w), flush_window();
+ 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 */
}
/* get length of block to copy */
- while (k < e) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b |= ((unsigned long)input_char) << k;
- k += 8;
- }
+ 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 */
- while (k < (unsigned) bd) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b |= ((unsigned long)input_char) << k;
- k += 8;
- }
-
+ b = fill_bitbuffer(b, &k, bd);
if ((e = (t = td + ((unsigned) b & md))->e) > 16)
do {
if (e == 99)
- return 1;
+ error_msg_and_die("inflate_codes error 2");;
b >>= t->b;
k -= t->b;
e -= 16;
- while (k < e) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b |= ((unsigned long)input_char) << k;
- k += 8;
- }
+ 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;
- while (k < e) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b |= ((unsigned long)input_char) << k;
- k += 8;
- }
+ b = fill_bitbuffer(b, &k, e);
d = w - t->v.n - ((unsigned) b & mask_bits[e]);
b >>= e;
k -= e;
/* do the copy */
- do {
+do_copy: do {
n -= (e =
(e =
- WSIZE - ((d &= WSIZE - 1) > w ? d : w)) > n ? n : e);
-#if !defined(NOMEMCPY) && !defined(DEBUG)
+ 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(window + w, window + d, e);
+ memcpy(gunzip_window + w, gunzip_window + d, e);
w += e;
d += e;
- } else /* do it slow to avoid memcpy() overlap */
-#endif /* !NOMEMCPY */
+ } else {
+ /* do it slow to avoid memcpy() overlap */
+ /* !NOMEMCPY */
do {
- window[w++] = window[d++];
+ gunzip_window[w++] = gunzip_window[d++];
} while (--e);
- if (w == WSIZE) {
- outcnt = (w), flush_window();
+ }
+ 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 */
- outcnt = w; /* restore global window pointer */
- bb = b; /* restore global bit buffer */
- bk = k;
-
+ 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 const unsigned short cplens[] = { /* Copy lengths for literal codes 257..285 */
- 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
- 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
-};
-
-/* note: see note #13 above about the 258 in this list. */
-static const extra_bits_t cplext[] = { /* Extra bits for literal codes 257..285 */
- 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
- 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 99, 99
-}; /* 99==invalid */
-static const unsigned short cpdist[] = { /* Copy offsets for distance codes 0..29 */
- 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
- 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
- 8193, 12289, 16385, 24577
-};
-static const extra_bits_t cpdext[] = { /* Extra bits for distance codes */
- 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
- 7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
- 12, 12, 13, 13
-};
+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;
+ }
-/* Tables for deflate from PKZIP's appnote.txt. */
-static const extra_bits_t border[] = { /* Order of the bit length code lengths */
- 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
-};
+ /* 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
*
* GLOBAL VARIABLES: bb, kk,
*/
+ // Return values: -1 = inflate_stored, -2 = inflate_codes
static int inflate_block(int *e)
{
unsigned t; /* block type */
- register unsigned long b; /* bit buffer */
- register unsigned k; /* number of bits in bit buffer */
- int input_char;
+ register unsigned int b; /* bit buffer */
+ unsigned int k; /* number of bits in bit buffer */
/* make local bit buffer */
- b = bb;
- k = bk;
+
+ b = gunzip_bb;
+ k = gunzip_bk;
/* read in last block bit */
- while (k < 1) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b |= ((unsigned long)input_char) << k;
- k += 8;
- }
+ b = fill_bitbuffer(b, &k, 1);
*e = (int) b & 1;
b >>= 1;
k -= 1;
/* read in block type */
- while (k < 2) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b |= ((unsigned long)input_char) << k;
- k += 8;
- }
+ b = fill_bitbuffer(b, &k, 2);
t = (unsigned) b & 3;
b >>= 2;
k -= 2;
/* restore the global bit buffer */
- bb = b;
- bk = k;
+ gunzip_bb = b;
+ gunzip_bk = k;
/* inflate that block type */
switch (t) {
case 0: /* Inflate stored */
{
- unsigned long n; /* number of bytes in block */
- unsigned long w; /* current window position */
- register unsigned long b_stored; /* bit buffer */
- register unsigned long k_stored; /* number of bits in bit buffer */
+ 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 = bb; /* initialize bit buffer */
- k_stored = bk;
- w = outcnt; /* initialize window position */
+ b_stored = gunzip_bb; /* initialize bit buffer */
+ k_stored = gunzip_bk;
/* go to byte boundary */
n = k_stored & 7;
k_stored -= n;
/* get the length and its complement */
- while (k_stored < 16) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b_stored |= ((unsigned long)input_char) << k_stored;
- k_stored += 8;
- }
+ b_stored = fill_bitbuffer(b_stored, &k_stored, 16);
n = ((unsigned) b_stored & 0xffff);
b_stored >>= 16;
k_stored -= 16;
- while (k_stored < 16) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b_stored |= ((unsigned long)input_char) << k_stored;
- k_stored += 8;
- }
+
+ 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;
- /* read and output the compressed data */
- while (n--) {
- while (k_stored < 8) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b_stored |= ((unsigned long)input_char) << k_stored;
- k_stored += 8;
- }
- window[w++] = (unsigned char) b_stored;
- if (w == (unsigned long) WSIZE) {
- outcnt = (w), flush_window();
- w = 0;
- }
- b_stored >>= 8;
- k_stored -= 8;
- }
-
- /* restore the globals from the locals */
- outcnt = w; /* restore global window pointer */
- bb = b_stored; /* restore global bit buffer */
- bk = k_stored;
- return 0;
+ 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
int i; /* temporary variable */
huft_t *tl; /* literal/length code table */
huft_t *td; /* distance code table */
- int bl; /* lookup bits for tl */
- int bd; /* lookup bits for td */
+ unsigned int 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 */
}
/* decompress until an end-of-block code */
- if (inflate_codes(tl, td, bl, bd))
- return 1;
-
- /* free the decoding tables, return */
- huft_free(tl);
- huft_free(td);
- return 0;
+ 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 */
- int i; /* temporary variables */
- unsigned j;
- unsigned l; /* last length */
- unsigned m; /* mask for bit lengths table */
- unsigned n; /* number of lengths to get */
huft_t *tl; /* literal/length code table */
huft_t *td; /* distance code table */
- int bl; /* lookup bits for tl */
- int bd; /* lookup bits for td */
- unsigned nb; /* number of bit length codes */
- unsigned nl; /* number of literal/length codes */
- unsigned nd; /* number of distance codes */
-
- unsigned ll[286 + 30]; /* literal/length and distance code lengths */
- register unsigned long b_dynamic; /* bit buffer */
- register unsigned k_dynamic; /* number of bits in bit buffer */
+ 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 = bb;
- k_dynamic = bk;
+ b_dynamic = gunzip_bb;
+ k_dynamic = gunzip_bk;
/* read in table lengths */
- while (k_dynamic < 5) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b_dynamic |= ((unsigned long)input_char) << k_dynamic;
- k_dynamic += 8;
- }
- nl = 257 + ((unsigned) b_dynamic & 0x1f); /* number of literal/length codes */
+ 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;
- while (k_dynamic < 5) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b_dynamic |= ((unsigned long)input_char) << k_dynamic;
- k_dynamic += 8;
- }
- nd = 1 + ((unsigned) b_dynamic & 0x1f); /* number of distance codes */
+ 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;
- while (k_dynamic < 4) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b_dynamic |= ((unsigned long)input_char) << k_dynamic;
- k_dynamic += 8;
- }
- nb = 4 + ((unsigned) b_dynamic & 0xf); /* number of bit length codes */
+ 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) {
/* read in bit-length-code lengths */
for (j = 0; j < nb; j++) {
- while (k_dynamic < 3) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b_dynamic |= ((unsigned long)input_char) << k_dynamic;
- k_dynamic += 8;
- }
- ll[border[j]] = (unsigned) b_dynamic & 7;
+ b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 3);
+ ll[border[j]] = (unsigned int) b_dynamic & 7;
b_dynamic >>= 3;
k_dynamic -= 3;
}
/* build decoding table for trees--single level, 7 bit lookup */
bl = 7;
- if ((i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl)) != 0) {
+ i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl);
+ if (i != 0) {
if (i == 1) {
huft_free(tl);
}
n = nl + nd;
m = mask_bits[bl];
i = l = 0;
- while ((unsigned) i < n) {
- while (k_dynamic < (unsigned) bl) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b_dynamic |= ((unsigned long)input_char) << k_dynamic;
- k_dynamic += 8;
- }
- j = (td = tl + ((unsigned) b_dynamic & m))->b;
+ 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 */
- while (k_dynamic < 2) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b_dynamic |= ((unsigned long)input_char) << k_dynamic;
- k_dynamic += 8;
- }
- j = 3 + ((unsigned) b_dynamic & 3);
+ b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 2);
+ j = 3 + ((unsigned int) b_dynamic & 3);
b_dynamic >>= 2;
k_dynamic -= 2;
- if ((unsigned) i + j > n) {
+ if ((unsigned int) i + j > n) {
return 1;
}
while (j--) {
ll[i++] = l;
}
} else if (j == 17) { /* 3 to 10 zero length codes */
- while (k_dynamic < 3) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b_dynamic |= ((unsigned long)input_char) << k_dynamic;
- k_dynamic += 8;
- }
- j = 3 + ((unsigned) b_dynamic & 7);
+ b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 3);
+ j = 3 + ((unsigned int) b_dynamic & 7);
b_dynamic >>= 3;
k_dynamic -= 3;
- if ((unsigned) i + j > n) {
+ if ((unsigned int) i + j > n) {
return 1;
}
while (j--) {
}
l = 0;
} else { /* j == 18: 11 to 138 zero length codes */
- while (k_dynamic < 7) {
- input_char = fgetc(in_file);
- if (input_char == EOF) return 1;
- b_dynamic |= ((unsigned long)input_char) << k_dynamic;
- k_dynamic += 8;
- }
- j = 11 + ((unsigned) b_dynamic & 0x7f);
+ b_dynamic = fill_bitbuffer(b_dynamic, &k_dynamic, 7);
+ j = 11 + ((unsigned int) b_dynamic & 0x7f);
b_dynamic >>= 7;
k_dynamic -= 7;
- if ((unsigned) i + j > n) {
+ if ((unsigned int) i + j > n) {
return 1;
}
while (j--) {
huft_free(tl);
/* restore the global bit buffer */
- bb = b_dynamic;
- bk = k_dynamic;
+ 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) {
- error_msg("Incomplete literal tree");
+ 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("incomplete distance tree");
+ 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 */
- return 2;
+ error_msg_and_die("bad block type %d\n", t);
}
}
-/*
- * decompress an inflated entry
- *
- * GLOBAL VARIABLES: outcnt, bk, bb, hufts, inptr
- */
-extern int inflate(FILE * in, FILE * out)
+static void calculate_gunzip_crc(void)
{
- int e; /* last block flag */
- int r; /* result code */
- unsigned h = 0; /* maximum struct huft's malloc'ed */
-
- /* initialize window, bit buffer */
- outcnt = 0;
- bk = 0;
- bb = 0;
-
- in_file = in;
- out_file = out;
-
- /* Allocate all global buffers (for DYN_ALLOC option) */
- window = xmalloc((size_t) (((2L * WSIZE) + 1L) * sizeof(unsigned char)));
- bytes_out = 0L;
-
- /* Create the crc table */
- make_crc_table();
+ 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;
+}
- /* decompress until the last block */
- do {
- hufts = 0;
- if ((r = inflate_block(&e)) != 0) {
- return r;
+static int inflate_get_next_window(void)
+{
+ static int needAnotherBlock = 1;
+ static int method = -1; // Method == -1 for stored, -2 for codes
+ static int e = 0;
+
+ gunzip_outbuf_count = 0;
+
+ while(1) {
+ int ret;
+
+ if (needAnotherBlock) {
+ if(e) { calculate_gunzip_crc(); return 0; } // Last block
+ method = inflate_block(&e);
+ needAnotherBlock = 0;
}
- if (hufts > h) {
- h = hufts;
+
+ switch (method) {
+ case -1: ret = inflate_stored(0,0,0,0);
+ break;
+ case -2: ret = inflate_codes(0,0,0,0,0);
+ break;
+ default: error_msg_and_die("inflate error %d", method);
}
- } while (!e);
-
- /* Undo too much lookahead. The next read will be byte aligned so we
- * can discard unused bits in the last meaningful byte.
- */
- while (bk >= 8) {
- bk -= 8;
- ungetc((bb << bk), in_file);
- }
- /* flush out window */
- flush_window();
- free(window);
- free(crc_table);
-
- /* return success */
- return 0;
+ if (ret == 1) {
+ calculate_gunzip_crc();
+ return 1; // More data left
+ } else needAnotherBlock = 1; // End of that block
+ }
}
-/* ===========================================================================
- * Unzip in to out. This routine works on gzip files only.
+/*
+ * User functions
*
- * IN assertions: the buffer inbuf contains already the beginning of
- * the compressed data, from offsets inptr to insize-1 included.
- * The magic header has already been checked. The output buffer is cleared.
- * in, out: input and output file descriptors
+ * read_gz, GZ_gzReadOpen, GZ_gzReadClose, inflate
*/
-extern int unzip(FILE * l_in_file, FILE * l_out_file)
-{
- unsigned char buf[8]; /* extended local header */
- unsigned char flags; /* compression flags */
- typedef void (*sig_type) (int);
- unsigned short i;
- unsigned char magic[2];
- 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);
+extern ssize_t read_gz(int fd, void *buf, size_t count)
+{
+ static int morebytes = 0, finished = 0;
+
+ if (morebytes) {
+ int bytesRead = morebytes > count ? count : morebytes;
+ memcpy(buf, gunzip_window + (gunzip_outbuf_count - morebytes), bytesRead);
+ morebytes -= bytesRead;
+ return bytesRead;
+ } else if (finished) {
+ return 0;
+ } else if (count >= 0x8000) { // We can decompress direcly to the buffer, 32k at a time
+ // Could decompress to larger buffer, but it must be a power of 2, and calculating that is probably more expensive than the benefit
+ unsigned char *old_gunzip_window = gunzip_window; // Save old window
+ gunzip_window = buf;
+ if (inflate_get_next_window() == 0) finished = 1;
+ gunzip_window = old_gunzip_window; // Restore old window
+ return gunzip_outbuf_count;
+ } else { // Oh well, need to split up the gunzip_window
+ int bytesRead;
+ if (inflate_get_next_window() == 0) finished = 1;
+ morebytes = gunzip_outbuf_count;
+ bytesRead = morebytes > count ? count : morebytes;
+ memcpy(buf, gunzip_window, bytesRead);
+ morebytes -= bytesRead;
+ return bytesRead;
}
-#endif
+
+}
- magic[0] = fgetc(l_in_file);
- magic[1] = fgetc(l_in_file);
+extern void GZ_gzReadOpen(int fd, void *unused, int nUnused)
+{
+ typedef void (*sig_type) (int);
-#ifdef CONFIG_FEATURE_UNCOMPRESS
- /* Magic header for compress files, 1F 9d = \037\235 */
- if ((magic[0] == 0x1F) && (magic[1] == 0x9d)) {
- return uncompress(l_in_file, l_out_file);
- }
-#endif
+ /* Allocate all global buffers (for DYN_ALLOC option) */
+ gunzip_window = xmalloc(gunzip_wsize);
+ gunzip_outbuf_count = 0;
+ gunzip_bytes_out = 0;
+ gunzip_src_fd = fd;
- /* Magic header for gzip files, 1F 8B = \037\213 */
- if ((magic[0] != 0x1F) || (magic[1] != 0x8b)) {
- error_msg("Invalid gzip magic");
- return EXIT_FAILURE;
- }
+ gunzip_in_buffer = malloc(8);
- /* Check the compression method */
- if (fgetc(l_in_file) != 8) /* also catches EOF */ {
- error_msg("Unknown compression method");
- return (-1);
- }
+ /* initialize gunzip_window, bit buffer */
+ gunzip_bk = 0;
+ gunzip_bb = 0;
- flags = (unsigned char) fgetc(l_in_file);
+ /* Create the crc table */
+ make_gunzip_crc_table();
+}
- /* Ignore time stamp(4), extra flags(1), OS type(1) */
- for (i = 0; i < 6; i++) {
- fgetc(l_in_file);
+extern void GZ_gzReadClose(void)
+{
+ /* Cleanup */
+ free(gunzip_window);
+ 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++;
+ gunzip_bb >>= 8;
+ gunzip_bk -= 8;
}
+}
- if (flags & 0x04) {
- /* bit 2 set: extra field present */
- const unsigned short extra =
- fgetc(l_in_file) + (fgetc(l_in_file) << 8);
- if (feof(in_file)) return 1;
- for (i = 0; i < extra; i++) {
- fgetc(l_in_file);
+/*extern int inflate(int in, int out) // Useful for testing read_gz
+{
+ char buf[8192];
+ ssize_t nread, nwrote;
+
+ 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;
}
}
-
- /* Discard original name if any */
- if (flags & 0x08) {
- /* bit 3 set: original file name present */
- while (fgetc(l_in_file) != 0 && !feof(l_in_file)); /* null */
- }
-
- /* Discard file comment if any */
- if (flags & 0x10) {
- /* bit 4 set: file comment present */
- while (fgetc(l_in_file) != 0 && !feof(l_in_file)); /* null */
- }
-
- /* Decompress */
- if (inflate(l_in_file, l_out_file) != 0) {
- error_msg("invalid compressed data--format violated");
- }
-
- /* Get the crc and original length
- * crc32 (see algorithm.doc)
- * uncompressed input size modulo 2^32
- */
- fread(buf, 1, 8, l_in_file);
-
- /* Validate decompression - crc */
- if ((unsigned int) ((buf[0] | (buf[1] << 8)) |
- ((buf[2] | (buf[3] << 8)) << 16)) !=
- (crc ^ 0xffffffffL)) {
- error_msg("invalid compressed data--crc error");
- }
- /* Validate decompression - size */
- if (((buf[4] | (buf[5] << 8)) | ((buf[6] | (buf[7] << 8)) << 16)) !=
- (unsigned long) bytes_out) {
- error_msg("invalid compressed data--length error");
- }
-
+ GZ_gzReadClose();
return 0;
-}
+}*/
-/*
- * This needs access to global variables window and crc_table, so its not in its own file.
- */
-extern void gz_close(int gunzip_pid)
+extern int inflate(int in, int out)
{
- if (kill(gunzip_pid, SIGTERM) == -1) {
- error_msg_and_die
- ("*** Couldnt kill old gunzip process *** aborting");
- }
-
- if (waitpid(gunzip_pid, NULL, 0) == -1) {
- printf("Couldnt wait ?");
+ ssize_t nwrote;
+ GZ_gzReadOpen(in, 0, 0);
+ while(1) {
+ int ret = inflate_get_next_window();
+ nwrote = full_write(out, gunzip_window, gunzip_outbuf_count);
+ if (nwrote == -1) {
+ perror_msg("write");
+ return -1;
+ }
+ if (ret == 0) break;
}
-
- free(window);
- free(crc_table);
+ GZ_gzReadClose();
+ return 0;
}
projects / oweals / busybox.git / blobdiff