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-rw-r--r--libbb/unzip.c747
1 files changed, 291 insertions, 456 deletions
diff --git a/libbb/unzip.c b/libbb/unzip.c
index d840670..20bf88f 100644
--- a/libbb/unzip.c
+++ b/libbb/unzip.c
@@ -65,114 +65,126 @@ static char *license_msg[] = {
#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
-
-static FILE *in_file, *out_file;
+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;
-/* these are freed by gz_close */
-static unsigned char *window;
-static unsigned long *crc_table;
+static int gunzip_src_fd;
+static int gunzip_dst_fd;
+unsigned int gunzip_bytes_out; /* number of output bytes */
+static unsigned int gunzip_outbuf_count; /* bytes in output buffer */
-static unsigned long crc; /* shift register contents */
+/* 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;
-/* Return codes from gzip */
-#define ERROR 1
+/* gunzip_window size--must be a power of two, and
+ * at least 32K for zip's deflate method */
+static const int gunzip_wsize = 0x8000;
-/*
- * 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_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,
+ 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
+};
+
+/* Tables for deflate from PKZIP's appnote.txt. */
+/* Order of the bit length code lengths */
+static const unsigned char border[] = {
+ 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
+};
+
+static unsigned int fill_bitbuffer(unsigned int bitbuffer, unsigned int *current, const unsigned int required)
+{
+ while (*current < required) {
+ bitbuffer |= ((unsigned int) xread_char(gunzip_src_fd)) << *current;
+ *current += 8;
+ }
+
+ return(bitbuffer);
+}
static void abort_gzip(void)
{
error_msg("gzip aborted\n");
- exit(ERROR);
+ exit(-1);
}
-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;
}
/*
@@ -183,7 +195,8 @@ static void flush_window(void)
*/
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;
@@ -195,8 +208,6 @@ static int huft_free(huft_t * 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
@@ -213,7 +224,7 @@ typedef unsigned char extra_bits_t;
*/
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 */
@@ -251,26 +262,35 @@ static int huft_build(unsigned int *b, const unsigned int n,
/* 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 */
@@ -285,8 +305,9 @@ static int huft_build(unsigned int *b, const unsigned int n,
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 */
@@ -314,8 +335,9 @@ static int huft_build(unsigned int *b, const unsigned int n,
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 */
}
}
@@ -324,7 +346,7 @@ static int huft_build(unsigned int *b, const unsigned int n,
/* allocate and link in new table */
q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t));
- hufts += z + 1; /* track memory usage */
+ gunzip_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 */
@@ -342,9 +364,9 @@ static int huft_build(unsigned int *b, const unsigned int n,
/* 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++ */
@@ -355,12 +377,14 @@ static int huft_build(unsigned int *b, const unsigned int n,
/* 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 */
@@ -374,6 +398,25 @@ static int huft_build(unsigned int *b, const unsigned int n,
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 (write(gunzip_dst_fd, gunzip_window, gunzip_outbuf_count) != gunzip_outbuf_count) {
+ error_msg_and_die("Couldnt write");
+ }
+ gunzip_bytes_out += gunzip_outbuf_count;
+ gunzip_outbuf_count = 0;
+}
+
/*
* inflate (decompress) the codes in a deflated (compressed) block.
* Return an error code or zero if it all goes ok.
@@ -381,32 +424,26 @@ static int huft_build(unsigned int *b, const unsigned int n,
* 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 * tl, huft_t * td, const unsigned int bl, const unsigned int bd)
{
- register unsigned long e; /* table entry flag/number of extra bits */
- unsigned long n, d; /* length and index for copy */
- unsigned long w; /* current window position */
+ 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 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;
+ unsigned int ml, md; /* masks for bl and bd bits */
+ unsigned int b; /* bit buffer */
+ unsigned int k; /* number of bits in bit buffer */
/* make local copies of globals */
- b = bb; /* initialize bit buffer */
- k = bk;
- w = outcnt; /* initialize window position */
+ 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];
- 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;
- }
+ 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) {
@@ -415,20 +452,16 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
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;
}
} else { /* it's an EOB or a length */
@@ -439,24 +472,13 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
}
/* 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)
@@ -464,23 +486,13 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
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;
@@ -489,60 +501,38 @@ static int inflate_codes(huft_t * tl, huft_t * td, int bl, int bd)
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);
+ flush_gunzip_window();
w = 0;
}
+
} while (n);
}
}
/* restore the globals from the locals */
- outcnt = w; /* restore global window pointer */
- bb = b; /* restore global bit buffer */
- bk = k;
+ gunzip_outbuf_count = w; /* restore global gunzip_window pointer */
+ gunzip_bb = b; /* restore global bit buffer */
+ gunzip_bk = k;
/* 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
-};
-
-/* 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
-};
-
/*
* decompress an inflated block
* e: last block flag
@@ -552,53 +542,43 @@ static const extra_bits_t border[] = { /* Order of the bit length code lengths *
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 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 = bb; /* initialize bit buffer */
- k_stored = bk;
- w = outcnt; /* initialize window position */
+ 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;
@@ -606,21 +586,12 @@ static int inflate_block(int *e)
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 */
}
@@ -629,15 +600,11 @@ static int inflate_block(int *e)
/* 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();
+ 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;
@@ -645,9 +612,9 @@ static int inflate_block(int *e)
}
/* restore the globals from the locals */
- outcnt = w; /* restore global window pointer */
- bb = b_stored; /* restore global bit buffer */
- bk = k_stored;
+ gunzip_outbuf_count = w; /* restore global gunzip_window pointer */
+ gunzip_bb = b_stored; /* restore global bit buffer */
+ gunzip_bk = k_stored;
return 0;
}
case 1: /* Inflate fixed
@@ -659,8 +626,8 @@ static int inflate_block(int *e)
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 */
@@ -692,8 +659,9 @@ static int inflate_block(int *e)
}
/* decompress until an end-of-block code */
- if (inflate_codes(tl, td, bl, bd))
+ if (inflate_codes(tl, td, bl, bd)) {
return 1;
+ }
/* free the decoding tables, return */
huft_free(tl);
@@ -705,53 +673,41 @@ static int inflate_block(int *e)
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) {
@@ -760,13 +716,8 @@ static int inflate_block(int *e)
/* 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;
}
@@ -776,7 +727,8 @@ static int inflate_block(int *e)
/* 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);
}
@@ -787,46 +739,31 @@ static int inflate_block(int *e)
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--) {
@@ -834,16 +771,11 @@ static int inflate_block(int *e)
}
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--) {
@@ -857,22 +789,24 @@ static int inflate_block(int *e)
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);
@@ -880,8 +814,9 @@ static int inflate_block(int *e)
}
/* decompress until an end-of-block code */
- if (inflate_codes(tl, td, bl, bd))
+ if (inflate_codes(tl, td, bl, bd)) {
return 1;
+ }
/* free the decoding tables, return */
huft_free(tl);
@@ -890,6 +825,7 @@ static int inflate_block(int *e)
}
default:
/* bad block type */
+ error_msg("bad block type %d\n", t);
return 2;
}
}
@@ -897,72 +833,24 @@ static int inflate_block(int *e)
/*
* decompress an inflated entry
*
- * GLOBAL VARIABLES: outcnt, bk, bb, hufts, inptr
+ * GLOBAL VARIABLES: gunzip_outbuf_count, bk, gunzip_bb, hufts, inptr
*/
-extern int inflate(FILE * in, FILE * out)
+extern int inflate(int in, int out)
{
+ typedef void (*sig_type) (int);
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;
+ gunzip_window = xmalloc(0x8000);
+ gunzip_outbuf_count = 0;
+ gunzip_bytes_out = 0;
- /* Create the crc table */
- make_crc_table();
+ gunzip_src_fd = in;
+ gunzip_dst_fd = out;
- /* decompress until the last block */
- do {
- hufts = 0;
- if ((r = inflate_block(&e)) != 0) {
- return r;
- }
- if (hufts > h) {
- h = hufts;
- }
- } 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;
-}
-
-/* ===========================================================================
- * Unzip in to out. This routine works on gzip files only.
- *
- * IN assertions: the buffer inbuf contains already the beginning of
- * the compressed data, from offsets inptr to insize-1 included.
- * The magic header has already been checked. The output buffer is cleared.
- * in, out: input and output file descriptors
- */
-extern int unzip(FILE * l_in_file, FILE * l_out_file)
-{
- unsigned char buf[8]; /* extended local header */
- unsigned char flags; /* compression flags */
- typedef void (*sig_type) (int);
- unsigned short i;
- unsigned char magic[2];
+ gunzip_in_buffer = malloc(8);
if (signal(SIGINT, SIG_IGN) != SIG_IGN) {
(void) signal(SIGINT, (sig_type) abort_gzip);
@@ -973,97 +861,44 @@ extern int unzip(FILE * l_in_file, FILE * l_out_file)
}
#endif
- magic[0] = fgetc(l_in_file);
- magic[1] = fgetc(l_in_file);
-
-#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
-
- /* Magic header for gzip files, 1F 8B = \037\213 */
- if ((magic[0] != 0x1F) || (magic[1] != 0x8b)) {
- error_msg("Invalid gzip magic");
- return EXIT_FAILURE;
- }
-
- /* Check the compression method */
- if (fgetc(l_in_file) != 8) /* also catches EOF */ {
- error_msg("Unknown compression method");
- return (-1);
- }
-
- flags = (unsigned char) fgetc(l_in_file);
-
- /* Ignore time stamp(4), extra flags(1), OS type(1) */
- for (i = 0; i < 6; i++) {
- fgetc(l_in_file);
- }
+ /* initialize gunzip_window, bit buffer */
+ gunzip_bk = 0;
+ gunzip_bb = 0;
- 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);
- }
- }
-
- /* 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 */
- }
+ /* Create the crc table */
+ make_gunzip_crc_table();
- /* 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 until the last block */
+ do {
+ gunzip_hufts = 0;
+ r = inflate_block(&e);
+ if (r != 0) {
+ error_msg_and_die("inflate error %d", r);
+ return r;
}
-
- /* Decompress */
- if (inflate(l_in_file, l_out_file) != 0) {
- error_msg("invalid compressed data--format violated");
+ if (gunzip_hufts > h) {
+ h = gunzip_hufts;
}
+ } while (!e);
- /* 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");
+ /* write any buffered uncompressed data */
+ flush_gunzip_window();
+ free(gunzip_window);
+
+ /* Cleanup */
+ 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;
}
+ /* return success */
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)
-{
- if (kill(gunzip_pid, SIGTERM) == -1) {
- error_msg_and_die
- ("*** Couldnt kill old gunzip process *** aborting");
- }
-
- if (waitpid(gunzip_pid, NULL, 0) == -1) {
- printf("Couldnt wait ?");
- }
-
- free(window);
- free(crc_table);
-}
generated by cgit v1.1 at 2024-11-15 07:15:50 +0000