* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
+#include <setjmp.h>
#include "libbb.h"
#include "unarchive.h"
-typedef struct huft_s {
+typedef struct huft_t {
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 */
+ struct huft_t *t; /* pointer to next level of table */
} v;
} huft_t;
enum {
/* gunzip_window size--must be a power of two, and
- * at least 32K for zip's deflate method */
+ * 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) */
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;
+ /* input (compressed) data */
+ unsigned char *bytebuffer; /* buffer itself */
+ unsigned bytebuffer_max; /* buffer size */
+ unsigned bytebuffer_offset; /* buffer position */
+ unsigned bytebuffer_size; /* how much data is there (size <= max) */
/* private data of inflate_codes() */
unsigned inflate_codes_ml; /* masks for bl and bd bits */
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 method; /* method == -1 for stored, -2 for codes */
smallint need_another_block;
smallint end_reached;
unsigned inflate_stored_b;
unsigned inflate_stored_k;
unsigned inflate_stored_w;
+
+ const char *error_msg;
+ jmp_buf error_jmp;
} state_t;
#define gunzip_bytes_out (S()gunzip_bytes_out )
#define gunzip_crc (S()gunzip_crc )
#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; })
+#define error_msg (S()error_msg )
+#define error_jmp (S()error_jmp )
-
-/* This is generic part */
+/* This is a generic part */
#if STATE_IN_BSS /* Use global data segment */
#define DECLARE_STATE /*nothing*/
-#define ALLOC_STATE (init_state())
+#define ALLOC_STATE /*nothing*/
#define DEALLOC_STATE ((void)0)
#define S() state.
#define PASS_STATE /*nothing*/
#define STATE_PARAM /*nothing*/
#define STATE_PARAM_ONLY void
static state_t state;
-static void init_state(void)
-{
- INIT_STATE;
-}
#endif
#if STATE_IN_MALLOC /* Use malloc space */
#define DECLARE_STATE state_t *state
-#define ALLOC_STATE (state = alloc_state())
+#define ALLOC_STATE (state = xzalloc(sizeof(*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 const unsigned short mask_bits[] ALIGN2 = {
+static const uint16_t mask_bits[] ALIGN2 = {
0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
};
/* Copy lengths for literal codes 257..285 */
-static const unsigned short cplens[] ALIGN2 = {
+static const uint16_t cplens[] ALIGN2 = {
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[] ALIGN1 = {
+static const uint8_t cplext[] ALIGN1 = {
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[] ALIGN2 = {
+static const uint16_t cpdist[] ALIGN2 = {
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[] ALIGN1 = {
+static const uint8_t cpdext[] ALIGN1 = {
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[] ALIGN1 = {
+static const uint8_t border[] ALIGN1 = {
16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
};
-static unsigned fill_bitbuffer(STATE_PARAM unsigned bitbuffer, unsigned *current, const unsigned required)
-{
- while (*current < required) {
- if (bytebuffer_offset >= bytebuffer_size) {
- /* Leave the first 4 bytes empty so we can always unwind the bitbuffer
- * to the front of the bytebuffer, leave 4 bytes free at end of tail
- * so we can easily top up buffer in check_trailer_gzip() */
- bytebuffer_size = 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;
-}
/*
* Free the malloc'ed tables built by huft_build(), which makes a linked
* each table.
* t: table to free
*/
-static void huft_free(huft_t * p)
+static void huft_free(huft_t *p)
{
huft_t *q;
}
}
+static void huft_free_all(STATE_PARAM_ONLY)
+{
+ huft_free(inflate_codes_tl);
+ huft_free(inflate_codes_td);
+ inflate_codes_tl = NULL;
+ inflate_codes_td = NULL;
+}
+
+static void abort_unzip(STATE_PARAM_ONLY) ATTRIBUTE_NORETURN;
+static void abort_unzip(STATE_PARAM_ONLY)
+{
+ huft_free_all(PASS_STATE_ONLY);
+ longjmp(error_jmp, 1);
+}
+
+static unsigned fill_bitbuffer(STATE_PARAM unsigned bitbuffer, unsigned *current, const unsigned required)
+{
+ while (*current < required) {
+ if (bytebuffer_offset >= bytebuffer_size) {
+ /* Leave the first 4 bytes empty so we can always unwind the bitbuffer
+ * to the front of the bytebuffer */
+ bytebuffer_size = safe_read(gunzip_src_fd, &bytebuffer[4], bytebuffer_max - 4);
+ if ((int)bytebuffer_size < 1) {
+ error_msg = "unexpected end of file";
+ abort_unzip(PASS_STATE_ONLY);
+ }
+ bytebuffer_size += 4;
+ bytebuffer_offset = 4;
+ }
+ bitbuffer |= ((unsigned) bytebuffer[bytebuffer_offset]) << *current;
+ bytebuffer_offset++;
+ *current += 8;
+ }
+ return bitbuffer;
+}
+
+
/* Given a list of code lengths and a maximum table size, make a set of
* tables to decode that set of codes. Return zero on success, one if
* the given code set is incomplete (the tables are still built in this
* case), two if the input is invalid (all zero length codes or an
- * oversubscribed set of lengths), and three if not enough memory.
+ * oversubscribed set of lengths) - in this case stores NULL in *t.
*
* b: code lengths in bits (all assumed <= BMAX)
* n: number of codes (assumed <= N_MAX)
* t: result: starting table
* m: maximum lookup bits, returns actual
*/
-static int huft_build(unsigned *b, const unsigned n,
+static int huft_build(const unsigned *b, const unsigned n,
const unsigned s, const unsigned short *d,
- const unsigned char *e, huft_t ** t, unsigned *m)
+ const unsigned char *e, huft_t **t, unsigned *m)
{
- unsigned a; /* counter for codes of length k */
- unsigned c[BMAX + 1]; /* bit length count table */
- 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 a; /* counter for codes of length k */
+ unsigned c[BMAX + 1]; /* bit length count table */
+ 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 */
/* Length of EOB code, if any */
eob_len = n > 256 ? b[256] : BMAX;
+ *t = NULL;
+
/* Generate counts for each bit length */
memset(c, 0, sizeof(c));
- p = b;
+ p = (unsigned *) b; /* cast allows us to reuse p for pointing to b */
i = n;
do {
c[*p]++; /* assume all entries <= BMAX */
- p++; /* Can't combine with above line (Solaris bug) */
+ p++; /* can't combine with above line (Solaris bug) */
} while (--i);
- if (c[0] == n) { /* null input--all zero length codes */
- *t = NULL;
+ if (c[0] == n) { /* null input - all zero length codes */
*m = 0;
- return 2;
+ return 2;
}
/* Find minimum and maximum length, bound *m by those */
- for (j = 1; (c[j] == 0) && (j <= BMAX); j++);
+ for (j = 1; (c[j] == 0) && (j <= BMAX); j++)
+ continue;
k = j; /* minimum code length */
- for (i = BMAX; (c[i] == 0) && i; i--);
+ for (i = BMAX; (c[i] == 0) && i; i--)
+ continue;
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) {
y -= c[j];
- if (y < 0) {
+ if (y < 0)
return 2; /* bad input: more codes than bits */
- }
}
y -= c[i];
- if (y < 0) {
+ if (y < 0)
return 2;
- }
c[i] += y;
/* Generate starting offsets into the value table for each length */
}
/* Make a table of values in order of bit lengths */
- p = b;
+ p = (unsigned *) b;
i = 0;
do {
j = *p++;
} while (++i < n);
/* Generate the Huffman codes and for each, make the table entries */
- x[0] = i = 0; /* first Huffman code is zero */
- p = v; /* grab values in bit order */
- 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 */
+ 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++) {
/* return actual size of base table */
*m = ws[1];
- /* Return true (1) if we were given an incomplete table */
+ /* Return 1 if we were given an incomplete table */
return y != 0 && g != 1;
}
#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 void inflate_codes_setup(STATE_PARAM unsigned my_bl, unsigned my_bd)
{
- tl = my_tl;
- td = my_td;
bl = my_bl;
bd = my_bd;
/* make local copies of globals */
unsigned e; /* table entry flag/number of extra bits */
huft_t *t; /* pointer to table entry */
- if (resume_copy) goto do_copy;
+ if (resume_copy)
+ goto do_copy;
while (1) { /* do until end of block */
bb = fill_bitbuffer(PASS_STATE bb, &k, bl);
e = t->e;
if (e > 16)
do {
- if (e == 99) {
-//shouldn't we propagate error?
- bb_error_msg_and_die("inflate_codes error 1");
- }
+ if (e == 99)
+ abort_unzip(PASS_STATE_ONLY);;
bb >>= t->b;
k -= t->b;
e -= 16;
if (e > 16)
do {
if (e == 99)
-//shouldn't we propagate error?
- bb_error_msg_and_die("inflate_codes error 2");
+ abort_unzip(PASS_STATE_ONLY);
bb >>= t->b;
k -= t->b;
e -= 16;
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);
+ /* free the decoding tables (tl and td), return */
+ huft_free_all(PASS_STATE_ONLY);
/* done */
return 0;
inflate_stored_w = 0;
inflate_stored_b >>= 8;
inflate_stored_k -= 8;
- return 1; // We have a block
+ return 1; /* We have a block */
}
inflate_stored_b >>= 8;
inflate_stored_k -= 8;
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
+ return 0; /* Finished */
}
/* One callsite in inflate_get_next_window */
static int inflate_block(STATE_PARAM smallint *e)
{
- unsigned t; /* block type */
- unsigned b; /* bit buffer */
- unsigned k; /* number of bits in bit buffer */
+ unsigned ll[286 + 30]; /* literal/length and distance code lengths */
+ unsigned t; /* block type */
+ unsigned b; /* bit buffer */
+ unsigned k; /* number of bits in bit buffer */
/* make local bit buffer */
gunzip_bb = b;
gunzip_bk = k;
+ /* Do we see block type 1 often? Yes!
+ * TODO: fix performance problem (see below) */
+ //bb_error_msg("blktype %d", t);
+
/* inflate that block type */
switch (t) {
- case 0: /* Inflate stored */
+ case 0: /* Inflate stored */
{
unsigned n; /* number of bytes in block */
unsigned b_stored; /* bit buffer */
b_stored = fill_bitbuffer(PASS_STATE b_stored, &k_stored, 16);
if (n != (unsigned) ((~b_stored) & 0xffff)) {
- return 1; /* error in compressed data */
+ abort_unzip(PASS_STATE_ONLY); /* error in compressed data */
}
b_stored >>= 16;
k_stored -= 16;
- inflate_stored_setup(PASS_STATE n, b_stored, k_stored); // Setup inflate_stored
+ inflate_stored_setup(PASS_STATE n, b_stored, k_stored);
return -1;
}
case 1:
/* Inflate fixed
- * decompress an inflated type 1 (fixed Huffman codes) block. We should
+ * 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. */
+ * Huffman tables. TODO */
{
- int i; /* temporary variable */
- huft_t *tl; /* literal/length code table */
- huft_t *td; /* distance code table */
- unsigned bl; /* lookup bits for tl */
- unsigned bd; /* lookup bits for td */
- unsigned l[288]; /* length list for huft_build */
+ int i; /* temporary variable */
+ unsigned bl; /* lookup bits for tl */
+ unsigned bd; /* lookup bits for td */
+ /* gcc 4.2.1 is too dumb to reuse stackspace. Moved up... */
+ //unsigned ll[288]; /* length list for huft_build */
/* set up literal table */
- for (i = 0; i < 144; i++) {
- l[i] = 8;
- }
- for (; i < 256; i++) {
- l[i] = 9;
- }
- for (; i < 280; i++) {
- l[i] = 7;
- }
- for (; i < 288; i++) { /* make a complete, but wrong code set */
- l[i] = 8;
- }
+ for (i = 0; i < 144; i++)
+ ll[i] = 8;
+ for (; i < 256; i++)
+ ll[i] = 9;
+ for (; i < 280; i++)
+ ll[i] = 7;
+ for (; i < 288; i++) /* make a complete, but wrong code set */
+ ll[i] = 8;
bl = 7;
- i = huft_build(l, 288, 257, cplens, cplext, &tl, &bl);
- if (i != 0) {
- return i;
- }
+ huft_build(ll, 288, 257, cplens, cplext, &inflate_codes_tl, &bl);
+ /* huft_build() never return nonzero - we use known data */
/* set up distance table */
- for (i = 0; i < 30; i++) { /* make an incomplete code set */
- l[i] = 5;
- }
+ for (i = 0; i < 30; i++) /* make an incomplete code set */
+ ll[i] = 5;
bd = 5;
- i = huft_build(l, 30, 0, cpdist, cpdext, &td, &bd);
- if (i > 1) {
- huft_free(tl);
- return i;
- }
+ huft_build(ll, 30, 0, cpdist, cpdext, &inflate_codes_td, &bd);
- /* decompress until an end-of-block code */
- inflate_codes_setup(PASS_STATE tl, td, bl, bd); // Setup inflate_codes
+ /* set up data for inflate_codes() */
+ inflate_codes_setup(PASS_STATE bl, bd);
/* huft_free code moved into inflate_codes */
return -2;
}
- case 2: /* Inflate dynamic */
+ 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 */
+ enum { dbits = 6 }; /* bits in base distance lookup table */
+ enum { lbits = 9 }; /* bits in base literal/length lookup table */
- huft_t *tl; /* literal/length code table */
- huft_t *td; /* distance code table */
- unsigned i; /* temporary variables */
+ huft_t *td; /* distance code table */
+ 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 */
+ 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;
b_dynamic >>= 4;
k_dynamic -= 4;
- if (nl > 286 || nd > 30) {
- return 1; /* bad lengths */
- }
+ if (nl > 286 || nd > 30)
+ abort_unzip(PASS_STATE_ONLY); /* bad lengths */
/* read in bit-length-code lengths */
for (j = 0; j < nb; j++) {
b_dynamic >>= 3;
k_dynamic -= 3;
}
- for (; j < 19; j++) {
+ for (; j < 19; j++)
ll[border[j]] = 0;
- }
- /* build decoding table for trees--single level, 7 bit lookup */
+ /* build decoding table for trees - single level, 7 bit lookup */
bl = 7;
- i = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl);
+ i = huft_build(ll, 19, 19, NULL, NULL, &inflate_codes_tl, &bl);
if (i != 0) {
- if (i == 1) {
- huft_free(tl);
- }
- return i; /* incomplete code set */
+ abort_unzip(PASS_STATE_ONLY); //return i; /* incomplete code set */
}
/* read in literal and distance code lengths */
i = l = 0;
while ((unsigned) i < n) {
b_dynamic = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, (unsigned)bl);
- j = (td = tl + ((unsigned) b_dynamic & m))->b;
+ td = inflate_codes_tl + ((unsigned) b_dynamic & m);
+ j = td->b;
b_dynamic >>= j;
k_dynamic -= j;
j = td->v.n;
b_dynamic >>= 2;
k_dynamic -= 2;
if ((unsigned) i + j > n) {
- return 1;
+ abort_unzip(PASS_STATE_ONLY); //return 1;
}
while (j--) {
ll[i++] = l;
b_dynamic >>= 3;
k_dynamic -= 3;
if ((unsigned) i + j > n) {
- return 1;
+ abort_unzip(PASS_STATE_ONLY); //return 1;
}
while (j--) {
ll[i++] = 0;
b_dynamic >>= 7;
k_dynamic -= 7;
if ((unsigned) i + j > n) {
- return 1;
+ abort_unzip(PASS_STATE_ONLY); //return 1;
}
while (j--) {
ll[i++] = 0;
}
/* free decoding table for trees */
- huft_free(tl);
+ huft_free(inflate_codes_tl);
/* restore the global bit buffer */
gunzip_bb = b_dynamic;
/* build the decoding tables for literal/length and distance codes */
bl = lbits;
- i = huft_build(ll, nl, 257, cplens, cplext, &tl, &bl);
- if (i != 0) {
- if (i == 1) {
-//shouldn't we propagate error?
- bb_error_msg_and_die("incomplete literal tree");
- /* huft_free(tl); */
- }
- return i; /* incomplete code set */
- }
-
+ i = huft_build(ll, nl, 257, cplens, cplext, &inflate_codes_tl, &bl);
+ if (i != 0)
+ abort_unzip(PASS_STATE_ONLY);
bd = dbits;
- i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &td, &bd);
- if (i != 0) {
- if (i == 1) {
-//shouldn't we propagate error?
- bb_error_msg_and_die("incomplete distance tree");
- /* huft_free(td); */
- }
- huft_free(tl);
- return i; /* incomplete code set */
- }
+ i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &inflate_codes_td, &bd);
+ if (i != 0)
+ abort_unzip(PASS_STATE_ONLY);
- /* decompress until an end-of-block code */
- inflate_codes_setup(PASS_STATE tl, td, bl, bd); // Setup inflate_codes
+ /* set up data for inflate_codes() */
+ inflate_codes_setup(PASS_STATE bl, bd);
/* huft_free code moved into inflate_codes */
return -2;
}
default:
- /* bad block type */
-//shouldn't we propagate error?
- bb_error_msg_and_die("bad block type %d", t);
+ abort_unzip(PASS_STATE_ONLY);
}
}
if (end_reached) {
calculate_gunzip_crc(PASS_STATE_ONLY);
end_reached = 0;
- need_another_block = 1;
+ /* NB: need_another_block is still set */
return 0; /* Last block */
}
method = inflate_block(PASS_STATE &end_reached);
case -2:
ret = inflate_codes(PASS_STATE_ONLY);
break;
- default:
-//shouldn't we propagate error?
- bb_error_msg_and_die("inflate error %d", method);
+ default: /* cannot happen */
+ abort_unzip(PASS_STATE_ONLY);
}
if (ret == 1) {
calculate_gunzip_crc(PASS_STATE_ONLY);
- return 1; // More data left
+ return 1; /* more data left */
}
- need_another_block = 1; // End of that block
+ need_another_block = 1; /* end of that block */
}
/* Doesnt get here */
}
/* Called from unpack_gz_stream() 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)
{
gunzip_bytes_out = 0;
gunzip_src_fd = in;
- /* initialize gunzip_window, bit buffer */
+ /* (re) initialize state */
+ method = -1;
+ need_another_block = 1;
+ resume_copy = 0;
gunzip_bk = 0;
gunzip_bb = 0;
gunzip_crc_table = crc32_filltable(NULL, 0);
gunzip_crc = ~0;
- /* Allocate space for buffer */
- bytebuffer = xmalloc(bytebuffer_max);
+ error_msg = "corrupted data";
+ if (setjmp(error_jmp)) {
+ /* Error from deep inside zip machinery */
+ n = -1;
+ goto ret;
+ }
while (1) {
int r = inflate_get_next_window(PASS_STATE_ONLY);
}
+/* External entry points */
+
+/* For unzip */
+
USE_DESKTOP(long long) int
inflate_unzip(inflate_unzip_result *res, unsigned bufsize, int in, int out)
{
ALLOC_STATE;
- bytebuffer_max = bufsize + 8;
+ bytebuffer_max = bufsize + 4;
bytebuffer_offset = 4;
+ bytebuffer = xmalloc(bytebuffer_max);
n = inflate_unzip_internal(PASS_STATE in, out);
+ free(bytebuffer);
res->crc = gunzip_crc;
res->bytes_out = gunzip_bytes_out;
- free(bytebuffer);
DEALLOC_STATE;
return n;
}
+/* For gunzip */
+
+/* helpers first */
+
+/* Top up the input buffer with at least n bytes. */
+static int top_up(STATE_PARAM unsigned n)
+{
+ int count = bytebuffer_size - bytebuffer_offset;
+
+ if (count < n) {
+ memmove(bytebuffer, &bytebuffer[bytebuffer_offset], count);
+ bytebuffer_offset = 0;
+ bytebuffer_size = full_read(gunzip_src_fd, &bytebuffer[count], bytebuffer_max - count);
+ if ((int)bytebuffer_size < 0) {
+ bb_error_msg("read error");
+ return 0;
+ }
+ bytebuffer_size += count;
+ if (bytebuffer_size < n)
+ return 0;
+ }
+ return 1;
+}
+
+static uint16_t buffer_read_le_u16(STATE_PARAM_ONLY)
+{
+ uint16_t res;
+#if BB_LITTLE_ENDIAN
+ /* gcc 4.2.1 is very clever */
+ memcpy(&res, &bytebuffer[bytebuffer_offset], 2);
+#else
+ res = bytebuffer[bytebuffer_offset];
+ res |= bytebuffer[bytebuffer_offset + 1] << 8;
+#endif
+ bytebuffer_offset += 2;
+ return res;
+}
+
+static uint32_t buffer_read_le_u32(STATE_PARAM_ONLY)
+{
+ uint32_t res;
+#if BB_LITTLE_ENDIAN
+ memcpy(&res, &bytebuffer[bytebuffer_offset], 4);
+#else
+ res = bytebuffer[bytebuffer_offset];
+ res |= bytebuffer[bytebuffer_offset + 1] << 8;
+ res |= bytebuffer[bytebuffer_offset + 2] << 16;
+ res |= bytebuffer[bytebuffer_offset + 3] << 24;
+#endif
+ bytebuffer_offset += 4;
+ return res;
+}
+
+static int check_header_gzip(STATE_PARAM_ONLY)
+{
+ union {
+ unsigned char raw[8];
+ struct {
+ uint8_t gz_method;
+ uint8_t flags;
+ //uint32_t mtime; - unused fields
+ //uint8_t xtra_flags;
+ //uint8_t os_flags;
+ } formatted; /* packed */
+ } header;
+
+ /*
+ * Rewind bytebuffer. We use the beginning because the header has 8
+ * bytes, leaving enough for unwinding afterwards.
+ */
+ bytebuffer_size -= bytebuffer_offset;
+ memmove(bytebuffer, &bytebuffer[bytebuffer_offset], bytebuffer_size);
+ bytebuffer_offset = 0;
+
+ if (!top_up(PASS_STATE 8))
+ return 0;
+ memcpy(header.raw, &bytebuffer[bytebuffer_offset], 8);
+ bytebuffer_offset += 8;
+
+ /* Check the compression method */
+ if (header.formatted.gz_method != 8) {
+ return 0;
+ }
+
+ if (header.formatted.flags & 0x04) {
+ /* bit 2 set: extra field present */
+ unsigned extra_short;
+
+ if (!top_up(PASS_STATE 2))
+ return 0;
+ extra_short = buffer_read_le_u16(PASS_STATE_ONLY);
+ if (!top_up(PASS_STATE extra_short))
+ return 0;
+ /* Ignore extra field */
+ bytebuffer_offset += extra_short;
+ }
+
+ /* Discard original name and file comment if any */
+ /* bit 3 set: original file name present */
+ /* bit 4 set: file comment present */
+ if (header.formatted.flags & 0x18) {
+ while (1) {
+ do {
+ if (!top_up(PASS_STATE 1))
+ return 0;
+ } while (bytebuffer[bytebuffer_offset++] != 0);
+ if ((header.formatted.flags & 0x18) != 0x18)
+ break;
+ header.formatted.flags &= ~0x18;
+ }
+ }
+
+ /* Read the header checksum */
+ if (header.formatted.flags & 0x02) {
+ if (!top_up(PASS_STATE 2))
+ return 0;
+ bytebuffer_offset += 2;
+ }
+ return 1;
+}
+
USE_DESKTOP(long long) int
unpack_gz_stream(int in, int out)
{
- uint32_t stored_crc = 0;
- unsigned count;
+ uint32_t v32;
USE_DESKTOP(long long) int n;
DECLARE_STATE;
- ALLOC_STATE;
+ n = 0;
+ ALLOC_STATE;
bytebuffer_max = 0x8000;
- n = inflate_unzip_internal(PASS_STATE in, out);
-
- if (n < 0) goto ret;
+ bytebuffer = xmalloc(bytebuffer_max);
- /* 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;
+ again:
+ if (!check_header_gzip(PASS_STATE_ONLY)) {
+ bb_error_msg("corrupted data");
+ n = -1;
+ goto ret;
}
- for (count = 0; count != 4; count++) {
- stored_crc |= (bytebuffer[bytebuffer_offset] << (count * 8));
- bytebuffer_offset++;
+ n += inflate_unzip_internal(PASS_STATE in, out);
+ if (n < 0)
+ goto ret;
+
+ if (!top_up(PASS_STATE 8)) {
+ bb_error_msg("corrupted data");
+ n = -1;
+ goto ret;
}
/* Validate decompression - crc */
- if (stored_crc != (~gunzip_crc)) {
+ v32 = buffer_read_le_u32(PASS_STATE_ONLY);
+ if ((~gunzip_crc) != v32) {
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))
- ) {
+ v32 = buffer_read_le_u32(PASS_STATE_ONLY);
+ if ((uint32_t)gunzip_bytes_out != v32) {
bb_error_msg("incorrect length");
n = -1;
}
+
+ if (!top_up(PASS_STATE 2))
+ goto ret; /* EOF */
+
+ if (bytebuffer[bytebuffer_offset] == 0x1f
+ && bytebuffer[bytebuffer_offset + 1] == 0x8b
+ ) {
+ bytebuffer_offset += 2;
+ goto again;
+ }
+ /* GNU gzip says: */
+ /*bb_error_msg("decompression OK, trailing garbage ignored");*/
+
ret:
free(bytebuffer);
DEALLOC_STATE;
projects / oweals / busybox.git / commitdiff