sin/samba-mirror
1
0
Fork 0
mirror of https://github.com/samba-team/samba.git synced 2025-02-03 13:47:25 +03:00
Code
samba-mirror/lib/compression/mszip.c

677 lines
21 KiB
C
Raw Normal View History

drsuapi: add all code required for our drsuapi rpc client. Guenther (This used to be commit 7c93190843e77764be4d0f6d4f0b93061c192c98)
2008-05-23 23:56:21 +02:00
/* mszip decompression - based on cabextract.c code from
* Stuart Caie
*
* adapted for Samba by Andrew Tridgell and Stefan Metzmacher 2005
*
* (C) 2000-2001 Stuart Caie <kyzer@4u.net>
* reaktivate-specifics by Malte Starostik <malte@kde.org>
*
* 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 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
Use single copy of compression library in Samba3,4.
2008-09-16 19:07:02 +02:00
#include "../compression/mszip.h"
drsuapi: add all code required for our drsuapi rpc client. Guenther (This used to be commit 7c93190843e77764be4d0f6d4f0b93061c192c98)
2008-05-23 23:56:21 +02:00
/*--------------------------------------------------------------------------*/
/* our archiver information / state */
/* MSZIP stuff */
#define ZIPWSIZE 0x8000 /* window size */
#define ZIPLBITS 9 /* bits in base literal/length lookup table */
#define ZIPDBITS 6 /* bits in base distance lookup table */
#define ZIPBMAX 16 /* maximum bit length of any code */
#define ZIPN_MAX 288 /* maximum number of codes in any set */
struct Ziphuft {
uint8_t e; /* number of extra bits or operation */
uint8_t b; /* number of bits in this code or subcode */
union {
uint16_t n; /* literal, length base, or distance base */
struct Ziphuft *t; /* pointer to next level of table */
} v;
};
struct ZIPstate {
uint32_t window_posn; /* current offset within the window */
uint32_t bb; /* bit buffer */
uint32_t bk; /* bits in bit buffer */
uint32_t ll[288+32]; /* literal/length and distance code lengths */
uint32_t c[ZIPBMAX+1]; /* bit length count table */
int32_t lx[ZIPBMAX+1]; /* memory for l[-1..ZIPBMAX-1] */
struct Ziphuft *u[ZIPBMAX]; /* table stack */
uint32_t v[ZIPN_MAX]; /* values in order of bit length */
uint32_t x[ZIPBMAX+1]; /* bit offsets, then code stack */
uint8_t *inpos;
};
/* generic stuff */
#define CAB(x) (decomp_state->x)
#define ZIP(x) (decomp_state->methods.zip.x)
/* CAB data blocks are <= 32768 bytes in uncompressed form. Uncompressed
* blocks have zero growth. MSZIP guarantees that it won't grow above
* uncompressed size by more than 12 bytes. LZX guarantees it won't grow
* more than 6144 bytes.
*/
#define CAB_BLOCKMAX (32768)
#define CAB_INPUTMAX (CAB_BLOCKMAX+6144)
struct decomp_state {
struct folder *current; /* current folder we're extracting from */
uint32_t offset; /* uncompressed offset within folder */
uint8_t *outpos; /* (high level) start of data to use up */
uint16_t outlen; /* (high level) amount of data to use up */
uint16_t split; /* at which split in current folder? */
int (*decompress)(int, int); /* the chosen compression func */
uint8_t inbuf[CAB_INPUTMAX+2]; /* +2 for lzx bitbuffer overflows! */
uint8_t outbuf[CAB_BLOCKMAX];
union {
struct ZIPstate zip;
} methods;
};
/* MSZIP decruncher */
/* Dirk Stoecker wrote the ZIP decoder, based on the InfoZip deflate code */
/* Tables for deflate from PKZIP's appnote.txt. */
static const uint8_t Zipborder[] = /* 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};
static const uint16_t Zipcplens[] = /* 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};
static const uint16_t Zipcplext[] = /* 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 uint16_t Zipcpdist[] = /* 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 uint16_t Zipcpdext[] = /* 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};
/* And'ing with Zipmask[n] masks the lower n bits */
static const uint16_t Zipmask[17] = {
0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
};
#define ZIPNEEDBITS(n) {while(k<(n)){int32_t c=*(ZIP(inpos)++);\
b|=((uint32_t)c)<<k;k+=8;}}
#define ZIPDUMPBITS(n) {b>>=(n);k-=(n);}
static void Ziphuft_free(struct Ziphuft *t)
{
register struct Ziphuft *p, *q;
/* Go through linked list, freeing from the allocated (t[-1]) address. */
p = t;
while (p != (struct Ziphuft *)NULL)
{
q = (--p)->v.t;
free(p);
p = q;
}
}
static int32_t Ziphuft_build(struct decomp_state *decomp_state,
uint32_t *b, uint32_t n, uint32_t s, const uint16_t *d, const uint16_t *e,
struct Ziphuft **t, int32_t *m)
{
uint32_t a; /* counter for codes of length k */
uint32_t el; /* length of EOB code (value 256) */
uint32_t f; /* i repeats in table every f entries */
int32_t g; /* maximum code length */
int32_t h; /* table level */
register uint32_t i; /* counter, current code */
register uint32_t j; /* counter */
register int32_t k; /* number of bits in current code */
int32_t *l; /* stack of bits per table */
register uint32_t *p; /* pointer into ZIP(c)[],ZIP(b)[],ZIP(v)[] */
register struct Ziphuft *q; /* points to current table */
struct Ziphuft r; /* table entry for structure assignment */
register int32_t w; /* bits before this table == (l * h) */
uint32_t *xp; /* pointer into x */
int32_t y; /* number of dummy codes added */
uint32_t z; /* number of entries in current table */
l = ZIP(lx)+1;
/* Generate counts for each bit length */
el = n > 256 ? b[256] : ZIPBMAX; /* set length of EOB code, if any */
for(i = 0; i < ZIPBMAX+1; ++i)
ZIP(c)[i] = 0;
p = b; i = n;
do
{
ZIP(c)[*p]++; p++; /* assume all entries <= ZIPBMAX */
} while (--i);
if (ZIP(c)[0] == n) /* null input--all zero length codes */
{
*t = (struct Ziphuft *)NULL;
*m = 0;
return 0;
}
/* Find minimum and maximum length, bound *m by those */
for (j = 1; j <= ZIPBMAX; j++)
if (ZIP(c)[j])
break;
k = j; /* minimum code length */
if ((uint32_t)*m < j)
*m = j;
for (i = ZIPBMAX; i; i--)
if (ZIP(c)[i])
break;
g = i; /* maximum code length */
if ((uint32_t)*m > i)
*m = i;
/* Adjust last length count to fill out codes, if needed */
for (y = 1 << j; j < i; j++, y <<= 1)
if ((y -= ZIP(c)[j]) < 0)
return 2; /* bad input: more codes than bits */
if ((y -= ZIP(c)[i]) < 0)
return 2;
ZIP(c)[i] += y;
/* Generate starting offsets int32_to the value table for each length */
ZIP(x)[1] = j = 0;
p = ZIP(c) + 1; xp = ZIP(x) + 2;
while (--i)
{ /* note that i == g from above */
*xp++ = (j += *p++);
}
/* Make a table of values in order of bit lengths */
p = b; i = 0;
do{
if ((j = *p++) != 0)
ZIP(v)[ZIP(x)[j]++] = i;
} while (++i < n);
/* Generate the Huffman codes and for each, make the table entries */
ZIP(x)[0] = i = 0; /* first Huffman code is zero */
p = ZIP(v); /* grab values in bit order */
h = -1; /* no tables yet--level -1 */
w = l[-1] = 0; /* no bits decoded yet */
ZIP(u)[0] = (struct Ziphuft *)NULL; /* just to keep compilers happy */
q = (struct Ziphuft *)NULL; /* ditto */
z = 0; /* ditto */
/* go through the bit lengths (k already is bits in shortest code) */
for (; k <= g; k++)
{
a = ZIP(c)[k];
while (a--)
{
/* here i is the Huffman code of length k bits for value *p */
/* make tables up to required level */
while (k > w + l[h])
{
w += l[h++]; /* add bits already decoded */
/* compute minimum size table less than or equal to *m bits */
z = (z = g - w) > (uint32_t)*m ? *m : z; /* upper limit */
if ((f = 1 << (j = k - w)) > a + 1) /* try a k-w bit table */
{ /* too few codes for k-w bit table */
f -= a + 1; /* deduct codes from patterns left */
xp = ZIP(c) + k;
while (++j < z) /* try smaller tables up to z bits */
{
if ((f <<= 1) <= *++xp)
break; /* enough codes to use up j bits */
f -= *xp; /* else deduct codes from patterns */
}
}
if ((uint32_t)w + j > el && (uint32_t)w < el)
j = el - w; /* make EOB code end at table */
z = 1 << j; /* table entries for j-bit table */
l[h] = j; /* set table size in stack */
/* allocate and link in new table */
if (!(q = (struct Ziphuft *)SMB_MALLOC((z + 1)*sizeof(struct Ziphuft))))
{
if(h)
Ziphuft_free(ZIP(u)[0]);
return 3; /* not enough memory */
}
*t = q + 1; /* link to list for Ziphuft_free() */
*(t = &(q->v.t)) = (struct Ziphuft *)NULL;
ZIP(u)[h] = ++q; /* table starts after link */
/* connect to last table, if there is one */
if (h)
{
ZIP(x)[h] = i; /* save pattern for backing up */
r.b = (uint8_t)l[h-1]; /* bits to dump before this table */
r.e = (uint8_t)(16 + j); /* bits in this table */
r.v.t = q; /* pointer to this table */
j = (i & ((1 << w) - 1)) >> (w - l[h-1]);
ZIP(u)[h-1][j] = r; /* connect to last table */
}
}
/* set up table entry in r */
r.b = (uint8_t)(k - w);
if (p >= ZIP(v) + n)
r.e = 99; /* out of values--invalid code */
else if (*p < s)
{
r.e = (uint8_t)(*p < 256 ? 16 : 15); /* 256 is end-of-block code */
r.v.n = *p++; /* simple code is just the value */
}
else
{
r.e = (uint8_t)e[*p - s]; /* non-simple--look up in lists */
r.v.n = d[*p++ - s];
}
/* fill code-like entries with r */
f = 1 << (k - w);
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)
i ^= j;
i ^= j;
/* backup over finished tables */
while ((i & ((1 << w) - 1)) != ZIP(x)[h])
w -= l[--h]; /* don't need to update q */
}
}
/* return actual size of base table */
*m = l[0];
/* Return true (1) if we were given an incomplete table */
return y != 0 && g != 1;
}
static int32_t Zipinflate_codes(struct decomp_state *decomp_state,
struct Ziphuft *tl, struct Ziphuft *td,
int32_t bl, int32_t bd)
{
register uint32_t e; /* table entry flag/number of extra bits */
uint32_t n, d; /* length and index for copy */
uint32_t w; /* current window position */
struct Ziphuft *t; /* pointer to table entry */
uint32_t ml, md; /* masks for bl and bd bits */
register uint32_t b; /* bit buffer */
register uint32_t k; /* number of bits in bit buffer */
DEBUG(10,("Zipinflate_codes\n"));
/* make local copies of globals */
b = ZIP(bb); /* initialize bit buffer */
k = ZIP(bk);
w = ZIP(window_posn); /* initialize window position */
/* inflate the coded data */
ml = Zipmask[bl]; /* precompute masks for speed */
md = Zipmask[bd];
for(;;)
{
ZIPNEEDBITS((uint32_t)bl)
if((e = (t = tl + ((uint32_t)b & ml))->e) > 16)
do
{
if (e == 99)
return 1;
ZIPDUMPBITS(t->b)
e -= 16;
ZIPNEEDBITS(e)
} while ((e = (t = t->v.t + ((uint32_t)b & Zipmask[e]))->e) > 16);
ZIPDUMPBITS(t->b)
if (w >= CAB_BLOCKMAX) break;
if (e == 16) /* then it's a literal */
CAB(outbuf)[w++] = (uint8_t)t->v.n;
else /* it's an EOB or a length */
{
/* exit if end of block */
if(e == 15)
break;
/* get length of block to copy */
ZIPNEEDBITS(e)
n = t->v.n + ((uint32_t)b & Zipmask[e]);
ZIPDUMPBITS(e);
/* decode distance of block to copy */
ZIPNEEDBITS((uint32_t)bd)
if ((e = (t = td + ((uint32_t)b & md))->e) > 16)
do {
if (e == 99)
return 1;
ZIPDUMPBITS(t->b)
e -= 16;
ZIPNEEDBITS(e)
} while ((e = (t = t->v.t + ((uint32_t)b & Zipmask[e]))->e) > 16);
ZIPDUMPBITS(t->b)
ZIPNEEDBITS(e)
d = w - t->v.n - ((uint32_t)b & Zipmask[e]);
ZIPDUMPBITS(e)
do
{
n -= (e = (e = ZIPWSIZE - ((d &= ZIPWSIZE-1) > w ? d : w)) > n ?n:e);
do
{
CAB(outbuf)[w++] = CAB(outbuf)[d++];
} while (--e);
} while (n);
}
}
/* restore the globals from the locals */
ZIP(window_posn) = w; /* restore global window pointer */
ZIP(bb) = b; /* restore global bit buffer */
ZIP(bk) = k;
/* done */
return 0;
}
/* "decompress" an inflated type 0 (stored) block. */
static int32_t Zipinflate_stored(struct decomp_state *decomp_state)
{
uint32_t n; /* number of bytes in block */
uint32_t w; /* current window position */
register uint32_t b; /* bit buffer */
register uint32_t k; /* number of bits in bit buffer */
/* make local copies of globals */
b = ZIP(bb); /* initialize bit buffer */
k = ZIP(bk);
w = ZIP(window_posn); /* initialize window position */
/* go to byte boundary */
n = k & 7;
ZIPDUMPBITS(n);
/* get the length and its complement */
ZIPNEEDBITS(16)
n = ((uint32_t)b & 0xffff);
ZIPDUMPBITS(16)
ZIPNEEDBITS(16)
if (n != (uint32_t)((~b) & 0xffff))
return 1; /* error in compressed data */
ZIPDUMPBITS(16)
/* read and output the compressed data */
while(n--)
{
ZIPNEEDBITS(8)
CAB(outbuf)[w++] = (uint8_t)b;
ZIPDUMPBITS(8)
}
/* restore the globals from the locals */
ZIP(window_posn) = w; /* restore global window pointer */
ZIP(bb) = b; /* restore global bit buffer */
ZIP(bk) = k;
return 0;
}
static int32_t Zipinflate_fixed(struct decomp_state *decomp_state)
{
struct Ziphuft *fixed_tl;
struct Ziphuft *fixed_td;
int32_t fixed_bl, fixed_bd;
int32_t i; /* temporary variable */
uint32_t *l;
l = ZIP(ll);
/* 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;
fixed_bl = 7;
if((i = Ziphuft_build(decomp_state, l, 288, 257, Zipcplens, Zipcplext, &fixed_tl, &fixed_bl)))
return i;
/* distance table */
for(i = 0; i < 30; i++) /* make an incomplete code set */
l[i] = 5;
fixed_bd = 5;
if((i = Ziphuft_build(decomp_state, l, 30, 0, Zipcpdist, Zipcpdext, &fixed_td, &fixed_bd)) > 1)
{
Ziphuft_free(fixed_tl);
return i;
}
/* decompress until an end-of-block code */
i = Zipinflate_codes(decomp_state, fixed_tl, fixed_td, fixed_bl, fixed_bd);
Ziphuft_free(fixed_td);
Ziphuft_free(fixed_tl);
return i;
}
/* decompress an inflated type 2 (dynamic Huffman codes) block. */
static int32_t Zipinflate_dynamic(struct decomp_state *decomp_state)
{
int32_t i; /* temporary variables */
uint32_t j;
uint32_t *ll;
uint32_t l; /* last length */
uint32_t m; /* mask for bit lengths table */
uint32_t n; /* number of lengths to get */
struct Ziphuft *tl; /* literal/length code table */
struct Ziphuft *td; /* distance code table */
int32_t bl; /* lookup bits for tl */
int32_t bd; /* lookup bits for td */
uint32_t nb; /* number of bit length codes */
uint32_t nl; /* number of literal/length codes */
uint32_t nd; /* number of distance codes */
register uint32_t b; /* bit buffer */
register uint32_t k; /* number of bits in bit buffer */
/* make local bit buffer */
b = ZIP(bb);
k = ZIP(bk);
ll = ZIP(ll);
/* read in table lengths */
ZIPNEEDBITS(5)
nl = 257 + ((uint32_t)b & 0x1f); /* number of literal/length codes */
ZIPDUMPBITS(5)
ZIPNEEDBITS(5)
nd = 1 + ((uint32_t)b & 0x1f); /* number of distance codes */
ZIPDUMPBITS(5)
ZIPNEEDBITS(4)
nb = 4 + ((uint32_t)b & 0xf); /* number of bit length codes */
ZIPDUMPBITS(4)
if(nl > 288 || nd > 32)
return 1; /* bad lengths */
/* read in bit-length-code lengths */
for(j = 0; j < nb; j++)
{
ZIPNEEDBITS(3)
ll[Zipborder[j]] = (uint32_t)b & 7;
ZIPDUMPBITS(3)
}
for(; j < 19; j++)
ll[Zipborder[j]] = 0;
/* build decoding table for trees--single level, 7 bit lookup */
bl = 7;
if((i = Ziphuft_build(decomp_state, ll, 19, 19, NULL, NULL, &tl, &bl)) != 0)
{
if(i == 1)
Ziphuft_free(tl);
return i; /* incomplete code set */
}
/* read in literal and distance code lengths */
n = nl + nd;
m = Zipmask[bl];
i = l = 0;
while((uint32_t)i < n)
{
ZIPNEEDBITS((uint32_t)bl)
j = (td = tl + ((uint32_t)b & m))->b;
ZIPDUMPBITS(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 */
{
ZIPNEEDBITS(2)
j = 3 + ((uint32_t)b & 3);
ZIPDUMPBITS(2)
if((uint32_t)i + j > n)
return 1;
while (j--)
ll[i++] = l;
}
else if (j == 17) /* 3 to 10 zero length codes */
{
ZIPNEEDBITS(3)
j = 3 + ((uint32_t)b & 7);
ZIPDUMPBITS(3)
if ((uint32_t)i + j > n)
return 1;
while (j--)
ll[i++] = 0;
l = 0;
}
else /* j == 18: 11 to 138 zero length codes */
{
ZIPNEEDBITS(7)
j = 11 + ((uint32_t)b & 0x7f);
ZIPDUMPBITS(7)
if ((uint32_t)i + j > n)
return 1;
while (j--)
ll[i++] = 0;
l = 0;
}
}
/* free decoding table for trees */
Ziphuft_free(tl);
/* restore the global bit buffer */
ZIP(bb) = b;
ZIP(bk) = k;
/* build the decoding tables for literal/length and distance codes */
bl = ZIPLBITS;
if((i = Ziphuft_build(decomp_state, ll, nl, 257, Zipcplens, Zipcplext, &tl, &bl)) != 0)
{
if(i == 1)
Ziphuft_free(tl);
return i; /* incomplete code set */
}
bd = ZIPDBITS;
Ziphuft_build(decomp_state, ll + nl, nd, 0, Zipcpdist, Zipcpdext, &td, &bd);
/* decompress until an end-of-block code */
if(Zipinflate_codes(decomp_state, tl, td, bl, bd))
return 1;
/* free the decoding tables, return */
Ziphuft_free(tl);
Ziphuft_free(td);
return 0;
}
/* e == last block flag */
static int32_t Zipinflate_block(struct decomp_state *decomp_state, int32_t *e)
{ /* decompress an inflated block */
uint32_t t; /* block type */
register uint32_t b; /* bit buffer */
register uint32_t k; /* number of bits in bit buffer */
DEBUG(10,("Zipinflate_block\n"));
/* make local bit buffer */
b = ZIP(bb);
k = ZIP(bk);
/* read in last block bit */
ZIPNEEDBITS(1)
*e = (int32_t)b & 1;
ZIPDUMPBITS(1)
/* read in block type */
ZIPNEEDBITS(2)
t = (uint32_t)b & 3;
ZIPDUMPBITS(2)
/* restore the global bit buffer */
ZIP(bb) = b;
ZIP(bk) = k;
DEBUG(10,("inflate type %d\n", t));
/* inflate that block type */
if(t == 2)
return Zipinflate_dynamic(decomp_state);
if(t == 0)
return Zipinflate_stored(decomp_state);
if(t == 1)
return Zipinflate_fixed(decomp_state);
/* bad block type */
return 2;
}
_PUBLIC_ struct decomp_state *ZIPdecomp_state(TALLOC_CTX *mem_ctx)
{
return talloc_zero(mem_ctx, struct decomp_state);
}
int ZIPdecompress(struct decomp_state *decomp_state, DATA_BLOB *inbuf, DATA_BLOB *outbuf)
{
int32_t e = 0;/* last block flag */
ZIP(inpos) = CAB(inbuf);
ZIP(bb) = ZIP(bk) = ZIP(window_posn) = 0;
if (inbuf->length > sizeof(decomp_state->inbuf)) return DECR_INPUT;
if (outbuf->length > sizeof(decomp_state->outbuf)) return DECR_OUTPUT;
if (outbuf->length > ZIPWSIZE) return DECR_DATAFORMAT;
memcpy(decomp_state->inbuf, inbuf->data, inbuf->length);
/* CK = Chris Kirmse, official Microsoft purloiner */
if (ZIP(inpos)[0] != 'C' || ZIP(inpos)[1] != 'K') return DECR_ILLEGALDATA;
ZIP(inpos) += 2;
while (!e) {
if (Zipinflate_block(decomp_state, &e)) {
return DECR_ILLEGALDATA;
}
}
memcpy(outbuf->data, decomp_state->outbuf, outbuf->length);
return DECR_OK;
}
Copy Permalink