bzip2: port bzip2 1.0.4 to busybox. note: bzip2 code resides

in separate directory (archival/bz/*)
and is covered by BSD-style license.
code size: 13k

10 files changed, 3041 insertions, 0 deletions

diff --git a/archival/bz/LICENSE b/archival/bz/LICENSE
new file mode 100644
index 000000000..f01f08022
--- /dev/null
+++ b/archival/bz/LICENSE
@@ -0,0 +1,44 @@
+bzip2 applet in busybox is based on lightly-modified source
+of bzip2 version 1.0.4. bzip2 source is distributed
+under the following conditions (copied verbatim from LICENSE file)
+===========================================================
+
+
+This program, "bzip2", the associated library "libbzip2", and all
+documentation, are copyright (C) 1996-2006 Julian R Seward.  All
+rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. The origin of this software must not be misrepresented; you must 
+   not claim that you wrote the original software.  If you use this 
+   software in a product, an acknowledgment in the product 
+   documentation would be appreciated but is not required.
+
+3. Altered source versions must be plainly marked as such, and must
+   not be misrepresented as being the original software.
+
+4. The name of the author may not be used to endorse or promote 
+   products derived from this software without specific prior written 
+   permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Julian Seward, Cambridge, UK.
+jseward@bzip.org
+bzip2/libbzip2 version 1.0.4 of 20 December 2006
diff --git a/archival/bz/README b/archival/bz/README
new file mode 100644
index 000000000..ef06d67da
--- /dev/null
+++ b/archival/bz/README
@@ -0,0 +1,90 @@
+This file is an abridged version of README from bizp2 1.0.4
+Build instructions (which are not relevant to busyboxed bzip2)
+are removed.
+===========================================================
+
+
+This is the README for bzip2/libzip2.
+This version is fully compatible with the previous public releases.
+
+------------------------------------------------------------------
+This file is part of bzip2/libbzip2, a program and library for
+lossless, block-sorting data compression.
+
+bzip2/libbzip2 version 1.0.4 of 20 December 2006
+Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
+
+Please read the WARNING, DISCLAIMER and PATENTS sections in this file.
+
+This program is released under the terms of the license contained
+in the file LICENSE.
+------------------------------------------------------------------
+
+Please read and be aware of the following:
+
+
+WARNING:
+
+   This program and library (attempts to) compress data by 
+   performing several non-trivial transformations on it.  
+   Unless you are 100% familiar with *all* the algorithms 
+   contained herein, and with the consequences of modifying them, 
+   you should NOT meddle with the compression or decompression 
+   machinery.  Incorrect changes can and very likely *will* 
+   lead to disastrous loss of data.
+
+
+DISCLAIMER:
+
+   I TAKE NO RESPONSIBILITY FOR ANY LOSS OF DATA ARISING FROM THE
+   USE OF THIS PROGRAM/LIBRARY, HOWSOEVER CAUSED.
+
+   Every compression of a file implies an assumption that the
+   compressed file can be decompressed to reproduce the original.
+   Great efforts in design, coding and testing have been made to
+   ensure that this program works correctly.  However, the complexity
+   of the algorithms, and, in particular, the presence of various
+   special cases in the code which occur with very low but non-zero
+   probability make it impossible to rule out the possibility of bugs
+   remaining in the program.  DO NOT COMPRESS ANY DATA WITH THIS
+   PROGRAM UNLESS YOU ARE PREPARED TO ACCEPT THE POSSIBILITY, HOWEVER
+   SMALL, THAT THE DATA WILL NOT BE RECOVERABLE.
+
+   That is not to say this program is inherently unreliable.  
+   Indeed, I very much hope the opposite is true.  bzip2/libbzip2 
+   has been carefully constructed and extensively tested.
+
+
+PATENTS:
+
+   To the best of my knowledge, bzip2/libbzip2 does not use any 
+   patented algorithms.  However, I do not have the resources 
+   to carry out a patent search.  Therefore I cannot give any 
+   guarantee of the above statement.
+
+
+I hope you find bzip2 useful.  Feel free to contact me at
+   jseward@bzip.org
+if you have any suggestions or queries.  Many people mailed me with
+comments, suggestions and patches after the releases of bzip-0.15,
+bzip-0.21, and bzip2 versions 0.1pl2, 0.9.0, 0.9.5, 1.0.0, 1.0.1,
+1.0.2 and 1.0.3, and the changes in bzip2 are largely a result of this
+feedback.  I thank you for your comments.
+
+bzip2's "home" is http://www.bzip.org/
+
+Julian Seward
+jseward@bzip.org
+Cambridge, UK.
+
+18     July 1996 (version 0.15)
+25   August 1996 (version 0.21)
+ 7   August 1997 (bzip2, version 0.1)
+29   August 1997 (bzip2, version 0.1pl2)
+23   August 1998 (bzip2, version 0.9.0)
+ 8     June 1999 (bzip2, version 0.9.5)
+ 4     Sept 1999 (bzip2, version 0.9.5d)
+ 5      May 2000 (bzip2, version 1.0pre8)
+30 December 2001 (bzip2, version 1.0.2pre1)
+15 February 2005 (bzip2, version 1.0.3)
+20 December 2006 (bzip2, version 1.0.4)
diff --git a/archival/bz/blocksort.c b/archival/bz/blocksort.c
new file mode 100644
index 000000000..7d2856ba7
--- /dev/null
+++ b/archival/bz/blocksort.c
@@ -0,0 +1,1128 @@
+/*
+ * bzip2 is written by Julian Seward <jseward@bzip.org>.
+ * Adapted for busybox by Denys Vlasenko <vda.linux@googlemail.com>.
+ * See README and LICENSE files in this directory for more information.
+ */
+
+/*-------------------------------------------------------------*/
+/*--- Block sorting machinery                               ---*/
+/*---                                           blocksort.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+This file is part of bzip2/libbzip2, a program and library for
+lossless, block-sorting data compression.
+
+bzip2/libbzip2 version 1.0.4 of 20 December 2006
+Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
+
+Please read the WARNING, DISCLAIMER and PATENTS sections in the
+README file.
+
+This program is released under the terms of the license contained
+in the file LICENSE.
+------------------------------------------------------------------ */
+
+/* #include "bzlib_private.h" */
+
+/*---------------------------------------------*/
+/*--- Fallback O(N log(N)^2) sorting        ---*/
+/*--- algorithm, for repetitive blocks      ---*/
+/*---------------------------------------------*/
+
+/*---------------------------------------------*/
+static
+inline
+void fallbackSimpleSort(uint32_t* fmap,
+		uint32_t* eclass,
+		int32_t   lo,
+		int32_t   hi)
+{
+	int32_t i, j, tmp;
+	uint32_t ec_tmp;
+
+	if (lo == hi) return;
+
+	if (hi - lo > 3) {
+		for (i = hi-4; i >= lo; i--) {
+			tmp = fmap[i];
+			ec_tmp = eclass[tmp];
+			for (j = i+4; j <= hi && ec_tmp > eclass[fmap[j]]; j += 4)
+				fmap[j-4] = fmap[j];
+			fmap[j-4] = tmp;
+		}
+	}
+
+	for (i = hi-1; i >= lo; i--) {
+		tmp = fmap[i];
+		ec_tmp = eclass[tmp];
+		for (j = i+1; j <= hi && ec_tmp > eclass[fmap[j]]; j++)
+			fmap[j-1] = fmap[j];
+		fmap[j-1] = tmp;
+	}
+}
+
+
+/*---------------------------------------------*/
+#define fswap(zz1, zz2) \
+{ \
+	int32_t zztmp = zz1; \
+	zz1 = zz2; \
+	zz2 = zztmp; \
+}
+
+#define fvswap(zzp1, zzp2, zzn) \
+{ \
+	int32_t yyp1 = (zzp1); \
+	int32_t yyp2 = (zzp2); \
+	int32_t yyn  = (zzn); \
+	while (yyn > 0) { \
+		fswap(fmap[yyp1], fmap[yyp2]); \
+		yyp1++; \
+		yyp2++; \
+		yyn--; \
+	} \
+}
+
+
+#define fmin(a,b) ((a) < (b)) ? (a) : (b)
+
+#define fpush(lz,hz) { \
+	stackLo[sp] = lz; \
+	stackHi[sp] = hz; \
+	sp++; \
+}
+
+#define fpop(lz,hz) { \
+	sp--; \
+	lz = stackLo[sp]; \
+	hz = stackHi[sp]; \
+}
+
+#define FALLBACK_QSORT_SMALL_THRESH 10
+#define FALLBACK_QSORT_STACK_SIZE   100
+
+
+static
+void fallbackQSort3(uint32_t* fmap,
+		uint32_t* eclass,
+		int32_t   loSt,
+		int32_t   hiSt)
+{
+	int32_t unLo, unHi, ltLo, gtHi, n, m;
+	int32_t sp, lo, hi;
+	uint32_t med, r, r3;
+	int32_t stackLo[FALLBACK_QSORT_STACK_SIZE];
+	int32_t stackHi[FALLBACK_QSORT_STACK_SIZE];
+
+	r = 0;
+
+	sp = 0;
+	fpush(loSt, hiSt);
+
+	while (sp > 0) {
+		AssertH(sp < FALLBACK_QSORT_STACK_SIZE - 1, 1004);
+
+		fpop(lo, hi);
+		if (hi - lo < FALLBACK_QSORT_SMALL_THRESH) {
+			fallbackSimpleSort(fmap, eclass, lo, hi);
+			continue;
+		}
+
+		/* Random partitioning.  Median of 3 sometimes fails to
+		 * avoid bad cases.  Median of 9 seems to help but
+		 * looks rather expensive.  This too seems to work but
+		 * is cheaper.  Guidance for the magic constants
+		 * 7621 and 32768 is taken from Sedgewick's algorithms
+		 * book, chapter 35.
+		 */
+		r = ((r * 7621) + 1) % 32768;
+		r3 = r % 3;
+		if (r3 == 0)
+			med = eclass[fmap[lo]];
+		else if (r3 == 1)
+			med = eclass[fmap[(lo+hi)>>1]];
+		else
+			med = eclass[fmap[hi]];
+
+		unLo = ltLo = lo;
+		unHi = gtHi = hi;
+
+		while (1) {
+			while (1) {
+				if (unLo > unHi) break;
+				n = (int32_t)eclass[fmap[unLo]] - (int32_t)med;
+				if (n == 0) {
+					fswap(fmap[unLo], fmap[ltLo]);
+					ltLo++;
+					unLo++;
+					continue;
+				};
+				if (n > 0) break;
+				unLo++;
+			}
+			while (1) {
+				if (unLo > unHi) break;
+				n = (int32_t)eclass[fmap[unHi]] - (int32_t)med;
+				if (n == 0) {
+					fswap(fmap[unHi], fmap[gtHi]);
+					gtHi--; unHi--;
+					continue;
+				};
+				if (n < 0) break;
+				unHi--;
+			}
+			if (unLo > unHi) break;
+			fswap(fmap[unLo], fmap[unHi]); unLo++; unHi--;
+		}
+
+		AssertD(unHi == unLo-1, "fallbackQSort3(2)");
+
+		if (gtHi < ltLo) continue;
+
+		n = fmin(ltLo-lo, unLo-ltLo); fvswap(lo, unLo-n, n);
+		m = fmin(hi-gtHi, gtHi-unHi); fvswap(unLo, hi-m+1, m);
+
+		n = lo + unLo - ltLo - 1;
+		m = hi - (gtHi - unHi) + 1;
+
+		if (n - lo > hi - m) {
+			fpush(lo, n);
+			fpush(m, hi);
+		} else {
+			fpush(m, hi);
+			fpush(lo, n);
+		}
+	}
+}
+
+#undef fmin
+#undef fpush
+#undef fpop
+#undef fswap
+#undef fvswap
+#undef FALLBACK_QSORT_SMALL_THRESH
+#undef FALLBACK_QSORT_STACK_SIZE
+
+
+/*---------------------------------------------*/
+/* Pre:
+ *	nblock > 0
+ *	eclass exists for [0 .. nblock-1]
+ *	((UChar*)eclass) [0 .. nblock-1] holds block
+ *	ptr exists for [0 .. nblock-1]
+ *
+ * Post:
+ *	((UChar*)eclass) [0 .. nblock-1] holds block
+ *	All other areas of eclass destroyed
+ *	fmap [0 .. nblock-1] holds sorted order
+ *	bhtab[0 .. 2+(nblock/32)] destroyed
+*/
+
+#define       SET_BH(zz)  bhtab[(zz) >> 5] |= (1 << ((zz) & 31))
+#define     CLEAR_BH(zz)  bhtab[(zz) >> 5] &= ~(1 << ((zz) & 31))
+#define     ISSET_BH(zz)  (bhtab[(zz) >> 5] & (1 << ((zz) & 31)))
+#define      WORD_BH(zz)  bhtab[(zz) >> 5]
+#define UNALIGNED_BH(zz)  ((zz) & 0x01f)
+
+static
+void fallbackSort(uint32_t* fmap,
+		uint32_t* eclass,
+		uint32_t* bhtab,
+		int32_t   nblock)
+{
+	int32_t ftab[257];
+	int32_t ftabCopy[256];
+	int32_t H, i, j, k, l, r, cc, cc1;
+	int32_t nNotDone;
+	int32_t nBhtab;
+	UChar* eclass8 = (UChar*)eclass;
+
+	/*
+	 * Initial 1-char radix sort to generate
+	 * initial fmap and initial BH bits.
+	 */
+	for (i = 0; i < 257;    i++) ftab[i] = 0;
+	for (i = 0; i < nblock; i++) ftab[eclass8[i]]++;
+	for (i = 0; i < 256;    i++) ftabCopy[i] = ftab[i];
+	for (i = 1; i < 257;    i++) ftab[i] += ftab[i-1];
+
+	for (i = 0; i < nblock; i++) {
+		j = eclass8[i];
+		k = ftab[j] - 1;
+		ftab[j] = k;
+		fmap[k] = i;
+	}
+
+	nBhtab = 2 + (nblock / 32);
+	for (i = 0; i < nBhtab; i++) bhtab[i] = 0;
+	for (i = 0; i < 256; i++) SET_BH(ftab[i]);
+
+	/*
+	 * Inductively refine the buckets.  Kind-of an
+	 * "exponential radix sort" (!), inspired by the
+	 * Manber-Myers suffix array construction algorithm.
+	 */
+
+	/*-- set sentinel bits for block-end detection --*/
+	for (i = 0; i < 32; i++) {
+		SET_BH(nblock + 2*i);
+		CLEAR_BH(nblock + 2*i + 1);
+	}
+
+	/*-- the log(N) loop --*/
+	H = 1;
+	while (1) {
+		j = 0;
+		for (i = 0; i < nblock; i++) {
+			if (ISSET_BH(i))
+				j = i;
+			k = fmap[i] - H;
+			if (k < 0)
+				k += nblock;
+			eclass[k] = j;
+		}
+
+		nNotDone = 0;
+		r = -1;
+		while (1) {
+
+	 /*-- find the next non-singleton bucket --*/
+			k = r + 1;
+			while (ISSET_BH(k) && UNALIGNED_BH(k))
+				k++;
+			if (ISSET_BH(k)) {
+				while (WORD_BH(k) == 0xffffffff) k += 32;
+				while (ISSET_BH(k)) k++;
+			}
+			l = k - 1;
+			if (l >= nblock)
+				break;
+			while (!ISSET_BH(k) && UNALIGNED_BH(k))
+				k++;
+			if (!ISSET_BH(k)) {
+				while (WORD_BH(k) == 0x00000000) k += 32;
+				while (!ISSET_BH(k)) k++;
+			}
+			r = k - 1;
+			if (r >= nblock)
+				break;
+
+			/*-- now [l, r] bracket current bucket --*/
+			if (r > l) {
+				nNotDone += (r - l + 1);
+				fallbackQSort3(fmap, eclass, l, r);
+
+				/*-- scan bucket and generate header bits-- */
+				cc = -1;
+				for (i = l; i <= r; i++) {
+					cc1 = eclass[fmap[i]];
+					if (cc != cc1) {
+						SET_BH(i);
+						cc = cc1;
+					};
+				}
+			}
+		}
+
+		H *= 2;
+		if (H > nblock || nNotDone == 0)
+			break;
+	}
+
+	/*
+	 * Reconstruct the original block in
+	 * eclass8 [0 .. nblock-1], since the
+	 * previous phase destroyed it.
+	 */
+	j = 0;
+	for (i = 0; i < nblock; i++) {
+		while (ftabCopy[j] == 0)
+			j++;
+		ftabCopy[j]--;
+		eclass8[fmap[i]] = (UChar)j;
+	}
+	AssertH(j < 256, 1005);
+}
+
+#undef       SET_BH
+#undef     CLEAR_BH
+#undef     ISSET_BH
+#undef      WORD_BH
+#undef UNALIGNED_BH
+
+
+/*---------------------------------------------*/
+/*--- The main, O(N^2 log(N)) sorting       ---*/
+/*--- algorithm.  Faster for "normal"       ---*/
+/*--- non-repetitive blocks.                ---*/
+/*---------------------------------------------*/
+
+/*---------------------------------------------*/
+static
+inline
+Bool mainGtU(
+		uint32_t  i1,
+		uint32_t  i2,
+		UChar*    block,
+		uint16_t* quadrant,
+		uint32_t  nblock,
+		int32_t*  budget)
+{
+	int32_t  k;
+	UChar  c1, c2;
+	uint16_t s1, s2;
+
+///unrolling
+	AssertD(i1 != i2, "mainGtU");
+	/* 1 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+	/* 2 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+	/* 3 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+	/* 4 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+	/* 5 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+	/* 6 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+	/* 7 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+	/* 8 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+	/* 9 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+	/* 10 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+	/* 11 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+	/* 12 */
+	c1 = block[i1]; c2 = block[i2];
+	if (c1 != c2) return (c1 > c2);
+	i1++; i2++;
+
+	k = nblock + 8;
+
+///unrolling
+	do {
+		/* 1 */
+		c1 = block[i1]; c2 = block[i2];
+		if (c1 != c2) return (c1 > c2);
+		s1 = quadrant[i1]; s2 = quadrant[i2];
+		if (s1 != s2) return (s1 > s2);
+		i1++; i2++;
+		/* 2 */
+		c1 = block[i1]; c2 = block[i2];
+		if (c1 != c2) return (c1 > c2);
+		s1 = quadrant[i1]; s2 = quadrant[i2];
+		if (s1 != s2) return (s1 > s2);
+		i1++; i2++;
+		/* 3 */
+		c1 = block[i1]; c2 = block[i2];
+		if (c1 != c2) return (c1 > c2);
+		s1 = quadrant[i1]; s2 = quadrant[i2];
+		if (s1 != s2) return (s1 > s2);
+		i1++; i2++;
+		/* 4 */
+		c1 = block[i1]; c2 = block[i2];
+		if (c1 != c2) return (c1 > c2);
+		s1 = quadrant[i1]; s2 = quadrant[i2];
+		if (s1 != s2) return (s1 > s2);
+		i1++; i2++;
+		/* 5 */
+		c1 = block[i1]; c2 = block[i2];
+		if (c1 != c2) return (c1 > c2);
+		s1 = quadrant[i1]; s2 = quadrant[i2];
+		if (s1 != s2) return (s1 > s2);
+		i1++; i2++;
+		/* 6 */
+		c1 = block[i1]; c2 = block[i2];
+		if (c1 != c2) return (c1 > c2);
+		s1 = quadrant[i1]; s2 = quadrant[i2];
+		if (s1 != s2) return (s1 > s2);
+		i1++; i2++;
+		/* 7 */
+		c1 = block[i1]; c2 = block[i2];
+		if (c1 != c2) return (c1 > c2);
+		s1 = quadrant[i1]; s2 = quadrant[i2];
+		if (s1 != s2) return (s1 > s2);
+		i1++; i2++;
+		/* 8 */
+		c1 = block[i1]; c2 = block[i2];
+		if (c1 != c2) return (c1 > c2);
+		s1 = quadrant[i1]; s2 = quadrant[i2];
+		if (s1 != s2) return (s1 > s2);
+		i1++; i2++;
+
+		if (i1 >= nblock) i1 -= nblock;
+		if (i2 >= nblock) i2 -= nblock;
+
+		k -= 8;
+		(*budget)--;
+	} while (k >= 0);
+
+	return False;
+}
+
+
+/*---------------------------------------------*/
+/*
+ * Knuth's increments seem to work better
+ * than Incerpi-Sedgewick here.  Possibly
+ * because the number of elems to sort is
+ * usually small, typically <= 20.
+ */
+static
+const int32_t incs[14] = {
+	1, 4, 13, 40, 121, 364, 1093, 3280,
+	9841, 29524, 88573, 265720,
+	797161, 2391484
+};
+
+static
+void mainSimpleSort(uint32_t* ptr,
+		UChar*  block,
+		uint16_t* quadrant,
+		int32_t   nblock,
+		int32_t   lo,
+		int32_t   hi,
+		int32_t   d,
+		int32_t*  budget)
+{
+	int32_t i, j, h, bigN, hp;
+	uint32_t v;
+
+	bigN = hi - lo + 1;
+	if (bigN < 2) return;
+
+	hp = 0;
+	while (incs[hp] < bigN) hp++;
+	hp--;
+
+	for (; hp >= 0; hp--) {
+		h = incs[hp];
+
+		i = lo + h;
+		while (1) {
+
+///unrolling
+			/*-- copy 1 --*/
+			if (i > hi) break;
+			v = ptr[i];
+			j = i;
+			while (mainGtU(ptr[j-h]+d, v+d, block, quadrant, nblock, budget)) {
+				ptr[j] = ptr[j-h];
+				j = j - h;
+				if (j <= (lo + h - 1)) break;
+			}
+			ptr[j] = v;
+			i++;
+
+			/*-- copy 2 --*/
+			if (i > hi) break;
+			v = ptr[i];
+			j = i;
+			while (mainGtU(ptr[j-h]+d, v+d, block, quadrant, nblock, budget)) {
+				ptr[j] = ptr[j-h];
+				j = j - h;
+				if (j <= (lo + h - 1)) break;
+			}
+			ptr[j] = v;
+			i++;
+
+			/*-- copy 3 --*/
+			if (i > hi) break;
+			v = ptr[i];
+			j = i;
+			while (mainGtU (ptr[j-h]+d, v+d, block, quadrant, nblock, budget)) {
+				ptr[j] = ptr[j-h];
+				j = j - h;
+				if (j <= (lo + h - 1)) break;
+			}
+			ptr[j] = v;
+			i++;
+
+			if (*budget < 0) return;
+		}
+	}
+}
+
+
+/*---------------------------------------------*/
+/*
+ * The following is an implementation of
+ * an elegant 3-way quicksort for strings,
+ * described in a paper "Fast Algorithms for
+ * Sorting and Searching Strings", by Robert
+ * Sedgewick and Jon L. Bentley.
+ */
+
+#define mswap(zz1, zz2) \
+{ \
+	int32_t zztmp = zz1; \
+	zz1 = zz2; \
+	zz2 = zztmp; \
+}
+
+#define mvswap(zzp1, zzp2, zzn) \
+{ \
+	int32_t yyp1 = (zzp1); \
+	int32_t yyp2 = (zzp2); \
+	int32_t yyn  = (zzn); \
+	while (yyn > 0) { \
+		mswap(ptr[yyp1], ptr[yyp2]); \
+		yyp1++; \
+		yyp2++; \
+		yyn--; \
+	} \
+}
+
+static
+inline
+UChar mmed3(UChar a, UChar b, UChar c)
+{
+	UChar t;
+	if (a > b) {
+		t = a;
+		a = b;
+		b = t;
+	};
+	if (b > c) {
+		b = c;
+		if (a > b)
+			b = a;
+	}
+	return b;
+}
+
+#define mmin(a,b) ((a) < (b)) ? (a) : (b)
+
+#define mpush(lz,hz,dz) \
+{ \
+	stackLo[sp] = lz; \
+	stackHi[sp] = hz; \
+	stackD [sp] = dz; \
+	sp++; \
+}
+
+#define mpop(lz,hz,dz) \
+{ \
+	sp--; \
+	lz = stackLo[sp]; \
+	hz = stackHi[sp]; \
+	dz = stackD [sp]; \
+}
+
+
+#define mnextsize(az) (nextHi[az]-nextLo[az])
+
+#define mnextswap(az,bz) \
+{ \
+	int32_t tz; \
+	tz = nextLo[az]; nextLo[az] = nextLo[bz]; nextLo[bz] = tz; \
+	tz = nextHi[az]; nextHi[az] = nextHi[bz]; nextHi[bz] = tz; \
+	tz = nextD [az]; nextD [az] = nextD [bz]; nextD [bz] = tz; \
+}
+
+#define MAIN_QSORT_SMALL_THRESH 20
+#define MAIN_QSORT_DEPTH_THRESH (BZ_N_RADIX + BZ_N_QSORT)
+#define MAIN_QSORT_STACK_SIZE   100
+
+static
+void mainQSort3(uint32_t* ptr,
+		UChar*    block,
+		uint16_t* quadrant,
+		int32_t   nblock,
+		int32_t   loSt,
+		int32_t   hiSt,
+		int32_t   dSt,
+		int32_t*  budget)
+{
+	int32_t unLo, unHi, ltLo, gtHi, n, m, med;
+	int32_t sp, lo, hi, d;
+
+	int32_t stackLo[MAIN_QSORT_STACK_SIZE];
+	int32_t stackHi[MAIN_QSORT_STACK_SIZE];
+	int32_t stackD [MAIN_QSORT_STACK_SIZE];
+
+	int32_t nextLo[3];
+	int32_t nextHi[3];
+	int32_t nextD [3];
+
+	sp = 0;
+	mpush(loSt, hiSt, dSt);
+
+	while (sp > 0) {
+		AssertH(sp < MAIN_QSORT_STACK_SIZE - 2, 1001);
+
+		mpop(lo, hi, d);
+		if (hi - lo < MAIN_QSORT_SMALL_THRESH
+		 || d > MAIN_QSORT_DEPTH_THRESH
+		) {
+			mainSimpleSort(ptr, block, quadrant, nblock, lo, hi, d, budget);
+			if (*budget < 0)
+				return;
+			continue;
+		}
+
+		med = (int32_t)	mmed3(block[ptr[lo          ] + d],
+		                      block[ptr[hi          ] + d],
+		                      block[ptr[(lo+hi) >> 1] + d]);
+
+		unLo = ltLo = lo;
+		unHi = gtHi = hi;
+
+		while (1) {
+			while (1) {
+				if (unLo > unHi)
+					break;
+				n = ((int32_t)block[ptr[unLo]+d]) - med;
+				if (n == 0) {
+					mswap(ptr[unLo], ptr[ltLo]);
+					ltLo++;
+					unLo++;
+					continue;
+				};
+				if (n >  0) break;
+				unLo++;
+			}
+			while (1) {
+				if (unLo > unHi)
+					break;
+				n = ((int32_t)block[ptr[unHi]+d]) - med;
+				if (n == 0) {
+					mswap(ptr[unHi], ptr[gtHi]);
+					gtHi--;
+					unHi--;
+					continue;
+				};
+				if (n <  0) break;
+				unHi--;
+			}
+			if (unLo > unHi)
+				break;
+			mswap(ptr[unLo], ptr[unHi]);
+			unLo++;
+			unHi--;
+		}
+
+		AssertD(unHi == unLo-1, "mainQSort3(2)");
+
+		if (gtHi < ltLo) {
+			mpush(lo, hi, d + 1);
+			continue;
+		}
+
+		n = mmin(ltLo-lo, unLo-ltLo); mvswap(lo, unLo-n, n);
+		m = mmin(hi-gtHi, gtHi-unHi); mvswap(unLo, hi-m+1, m);
+
+		n = lo + unLo - ltLo - 1;
+		m = hi - (gtHi - unHi) + 1;
+
+		nextLo[0] = lo;  nextHi[0] = n;   nextD[0] = d;
+		nextLo[1] = m;   nextHi[1] = hi;  nextD[1] = d;
+		nextLo[2] = n+1; nextHi[2] = m-1; nextD[2] = d+1;
+
+		if (mnextsize(0) < mnextsize(1)) mnextswap(0,1);
+		if (mnextsize(1) < mnextsize(2)) mnextswap(1,2);
+		if (mnextsize(0) < mnextsize(1)) mnextswap(0,1);
+
+		AssertD (mnextsize(0) >= mnextsize(1), "mainQSort3(8)");
+		AssertD (mnextsize(1) >= mnextsize(2), "mainQSort3(9)");
+
+		mpush (nextLo[0], nextHi[0], nextD[0]);
+		mpush (nextLo[1], nextHi[1], nextD[1]);
+		mpush (nextLo[2], nextHi[2], nextD[2]);
+	}
+}
+
+#undef mswap
+#undef mvswap
+#undef mpush
+#undef mpop
+#undef mmin
+#undef mnextsize
+#undef mnextswap
+#undef MAIN_QSORT_SMALL_THRESH
+#undef MAIN_QSORT_DEPTH_THRESH
+#undef MAIN_QSORT_STACK_SIZE
+
+
+/*---------------------------------------------*/
+/* Pre:
+ * 	nblock > N_OVERSHOOT
+ * 	block32 exists for [0 .. nblock-1 +N_OVERSHOOT]
+ * 	((UChar*)block32) [0 .. nblock-1] holds block
+ * 	ptr exists for [0 .. nblock-1]
+ *
+ * Post:
+ * 	((UChar*)block32) [0 .. nblock-1] holds block
+ * 	All other areas of block32 destroyed
+ * 	ftab[0 .. 65536] destroyed
+ * 	ptr [0 .. nblock-1] holds sorted order
+ * 	if (*budget < 0), sorting was abandoned
+ */
+
+#define BIGFREQ(b) (ftab[((b)+1) << 8] - ftab[(b) << 8])
+#define SETMASK (1 << 21)
+#define CLEARMASK (~(SETMASK))
+
+static NOINLINE
+void mainSort(uint32_t*   ptr,
+		UChar*    block,
+		uint16_t* quadrant,
+		uint32_t* ftab,
+		int32_t   nblock,
+		int32_t*  budget)
+{
+	int32_t  i, j, k, ss, sb;
+	int32_t  runningOrder[256];
+	Bool   bigDone[256];
+	int32_t  copyStart[256];
+	int32_t  copyEnd  [256];
+	UChar  c1;
+	int32_t  numQSorted;
+	uint16_t s;
+
+	/*-- set up the 2-byte frequency table --*/
+	/* was: for (i = 65536; i >= 0; i--) ftab[i] = 0; */
+	memset(ftab, 0, 65537 * sizeof(ftab[0]));
+
+	j = block[0] << 8;
+	i = nblock-1;
+#if 0
+	for (; i >= 3; i -= 4) {
+		quadrant[i] = 0;
+		j = (j >> 8) |(((uint16_t)block[i]) << 8);
+		ftab[j]++;
+		quadrant[i-1] = 0;
+		j = (j >> 8) |(((uint16_t)block[i-1]) << 8);
+		ftab[j]++;
+		quadrant[i-2] = 0;
+		j = (j >> 8) |(((uint16_t)block[i-2]) << 8);
+		ftab[j]++;
+		quadrant[i-3] = 0;
+		j = (j >> 8) |(((uint16_t)block[i-3]) << 8);
+		ftab[j]++;
+	}
+#endif
+	for (; i >= 0; i--) {
+		quadrant[i] = 0;
+		j = (j >> 8) |(((uint16_t)block[i]) << 8);
+		ftab[j]++;
+	}
+
+	/*-- (emphasises close relationship of block & quadrant) --*/
+	for (i = 0; i < BZ_N_OVERSHOOT; i++) {
+		block   [nblock+i] = block[i];
+		quadrant[nblock+i] = 0;
+	}
+
+	/*-- Complete the initial radix sort --*/
+	for (i = 1; i <= 65536; i++) ftab[i] += ftab[i-1];
+
+	s = block[0] << 8;
+	i = nblock-1;
+#if 0
+	for (; i >= 3; i -= 4) {
+		s = (s >> 8) | (block[i] << 8);
+		j = ftab[s] -1;
+		ftab[s] = j;
+		ptr[j] = i;
+		s = (s >> 8) | (block[i-1] << 8);
+		j = ftab[s] -1;
+		ftab[s] = j;
+		ptr[j] = i-1;
+		s = (s >> 8) | (block[i-2] << 8);
+		j = ftab[s] -1;
+		ftab[s] = j;
+		ptr[j] = i-2;
+		s = (s >> 8) | (block[i-3] << 8);
+		j = ftab[s] -1;
+		ftab[s] = j;
+		ptr[j] = i-3;
+	}
+#endif
+	for (; i >= 0; i--) {
+		s = (s >> 8) | (block[i] << 8);
+		j = ftab[s] -1;
+		ftab[s] = j;
+		ptr[j] = i;
+	}
+
+	/*
+	 * Now ftab contains the first loc of every small bucket.
+	 * Calculate the running order, from smallest to largest
+	 * big bucket.
+	 */
+	for (i = 0; i <= 255; i++) {
+		bigDone     [i] = False;
+		runningOrder[i] = i;
+	}
+
+	{
+		int32_t vv;
+		/* was: int32_t h = 1; */
+		/* do h = 3 * h + 1; while (h <= 256); */
+		int32_t h = 364;
+
+		do {
+			h = h / 3;
+			for (i = h; i <= 255; i++) {
+				vv = runningOrder[i];
+				j = i;
+				while (BIGFREQ(runningOrder[j-h]) > BIGFREQ(vv)) {
+					runningOrder[j] = runningOrder[j-h];
+					j = j - h;
+					if (j <= (h - 1)) goto zero;
+				}
+				zero:
+				runningOrder[j] = vv;
+			}
+		} while (h != 1);
+	}
+
+	/*
+	 * The main sorting loop.
+	 */
+
+	numQSorted = 0;
+
+	for (i = 0; i <= 255; i++) {
+
+		/*
+		 * Process big buckets, starting with the least full.
+		 * Basically this is a 3-step process in which we call
+		 * mainQSort3 to sort the small buckets [ss, j], but
+		 * also make a big effort to avoid the calls if we can.
+		 */
+		ss = runningOrder[i];
+
+		/*
+		 * Step 1:
+		 * Complete the big bucket [ss] by quicksorting
+		 * any unsorted small buckets [ss, j], for j != ss.
+		 * Hopefully previous pointer-scanning phases have already
+		 * completed many of the small buckets [ss, j], so
+		 * we don't have to sort them at all.
+		 */
+		for (j = 0; j <= 255; j++) {
+			if (j != ss) {
+				sb = (ss << 8) + j;
+				if (!(ftab[sb] & SETMASK)) {
+					int32_t lo = ftab[sb]   & CLEARMASK;
+					int32_t hi = (ftab[sb+1] & CLEARMASK) - 1;
+					if (hi > lo) {
+						mainQSort3 (
+							ptr, block, quadrant, nblock,
+							lo, hi, BZ_N_RADIX, budget
+						);
+						numQSorted += (hi - lo + 1);
+						if (*budget < 0) return;
+					}
+				}
+				ftab[sb] |= SETMASK;
+			}
+		}
+
+		AssertH(!bigDone[ss], 1006);
+
+		/*
+		 * Step 2:
+		 * Now scan this big bucket [ss] so as to synthesise the
+		 * sorted order for small buckets [t, ss] for all t,
+		 * including, magically, the bucket [ss,ss] too.
+		 * This will avoid doing Real Work in subsequent Step 1's.
+		 */
+		{
+			for (j = 0; j <= 255; j++) {
+				copyStart[j] =  ftab[(j << 8) + ss]     & CLEARMASK;
+				copyEnd  [j] = (ftab[(j << 8) + ss + 1] & CLEARMASK) - 1;
+			}
+			for (j = ftab[ss << 8] & CLEARMASK; j < copyStart[ss]; j++) {
+				k = ptr[j] - 1;
+				if (k < 0)
+					k += nblock;
+				c1 = block[k];
+				if (!bigDone[c1])
+					ptr[copyStart[c1]++] = k;
+			}
+			for (j = (ftab[(ss+1) << 8] & CLEARMASK) - 1; j > copyEnd[ss]; j--) {
+				k = ptr[j]-1;
+				if (k < 0)
+					k += nblock;
+				c1 = block[k];
+				if (!bigDone[c1])
+					ptr[copyEnd[c1]--] = k;
+			}
+		}
+
+		AssertH((copyStart[ss]-1 == copyEnd[ss])
+					 ||
+					/* Extremely rare case missing in bzip2-1.0.0 and 1.0.1.
+					 * Necessity for this case is demonstrated by compressing
+					 * a sequence of approximately 48.5 million of character
+					 * 251; 1.0.0/1.0.1 will then die here. */
+					(copyStart[ss] == 0 && copyEnd[ss] == nblock-1),
+					1007)
+
+		for (j = 0; j <= 255; j++)
+			ftab[(j << 8) + ss] |= SETMASK;
+
+		/*
+		 * Step 3:
+		 * The [ss] big bucket is now done.  Record this fact,
+		 * and update the quadrant descriptors.  Remember to
+		 * update quadrants in the overshoot area too, if
+		 * necessary.  The "if (i < 255)" test merely skips
+		 * this updating for the last bucket processed, since
+		 * updating for the last bucket is pointless.
+		 *
+		 * The quadrant array provides a way to incrementally
+		 * cache sort orderings, as they appear, so as to
+		 * make subsequent comparisons in fullGtU() complete
+		 * faster.  For repetitive blocks this makes a big
+		 * difference (but not big enough to be able to avoid
+		 * the fallback sorting mechanism, exponential radix sort).
+		 *
+		 * The precise meaning is: at all times:
+		 *
+		 *	for 0 <= i < nblock and 0 <= j <= nblock
+		 *
+		 *	if block[i] != block[j],
+		 *
+		 *		then the relative values of quadrant[i] and
+		 *			  quadrant[j] are meaningless.
+		 *
+		 *		else {
+		 *			if quadrant[i] < quadrant[j]
+		 *				then the string starting at i lexicographically
+		 *				precedes the string starting at j
+		 *
+		 *			else if quadrant[i] > quadrant[j]
+		 *				then the string starting at j lexicographically
+		 *				precedes the string starting at i
+		 *
+		 *			else
+		 *				the relative ordering of the strings starting
+		 *				at i and j has not yet been determined.
+		 *		}
+		 */
+		bigDone[ss] = True;
+
+		if (i < 255) {
+			int32_t bbStart = ftab[ss << 8] & CLEARMASK;
+			int32_t bbSize  = (ftab[(ss+1) << 8] & CLEARMASK) - bbStart;
+			int32_t shifts  = 0;
+
+			while ((bbSize >> shifts) > 65534) shifts++;
+
+			for (j = bbSize-1; j >= 0; j--) {
+				int32_t a2update     = ptr[bbStart + j];
+				uint16_t qVal        = (uint16_t)(j >> shifts);
+				quadrant[a2update] = qVal;
+				if (a2update < BZ_N_OVERSHOOT)
+					quadrant[a2update + nblock] = qVal;
+			}
+			AssertH(((bbSize-1) >> shifts) <= 65535, 1002);
+		}
+
+	}
+}
+
+#undef BIGFREQ
+#undef SETMASK
+#undef CLEARMASK
+
+
+/*---------------------------------------------*/
+/* Pre:
+ *	nblock > 0
+ *	arr2 exists for [0 .. nblock-1 +N_OVERSHOOT]
+ *	  ((UChar*)arr2)[0 .. nblock-1] holds block
+ *	arr1 exists for [0 .. nblock-1]
+ *
+ * Post:
+ *	((UChar*)arr2) [0 .. nblock-1] holds block
+ *	All other areas of block destroyed
+ *	ftab[0 .. 65536] destroyed
+ *	arr1[0 .. nblock-1] holds sorted order
+ */
+static NOINLINE
+void BZ2_blockSort(EState* s)
+{
+	/* In original bzip2 1.0.4, it's a parameter, but 30
+	 * should work ok. */
+	enum { wfact = 30 };
+
+	uint32_t* ptr    = s->ptr;
+	UChar*    block  = s->block;
+	uint32_t* ftab   = s->ftab;
+	int32_t   nblock = s->nblock;
+	uint16_t* quadrant;
+	int32_t   budget;
+	int32_t   i;
+
+	if (nblock < 10000) {
+		fallbackSort(s->arr1, s->arr2, ftab, nblock);
+	} else {
+		/* Calculate the location for quadrant, remembering to get
+		 * the alignment right.  Assumes that &(block[0]) is at least
+		 * 2-byte aligned -- this should be ok since block is really
+		 * the first section of arr2.
+		 */
+		i = nblock + BZ_N_OVERSHOOT;
+		if (i & 1) i++;
+		quadrant = (uint16_t*)(&(block[i]));
+
+		/* (wfact-1) / 3 puts the default-factor-30
+		 * transition point at very roughly the same place as
+		 * with v0.1 and v0.9.0.
+		 * Not that it particularly matters any more, since the
+		 * resulting compressed stream is now the same regardless
+		 * of whether or not we use the main sort or fallback sort.
+		 */
+		budget = nblock * ((wfact-1) / 3);
+
+		mainSort(ptr, block, quadrant, ftab, nblock, &budget);
+		if (budget < 0) {
+			fallbackSort(s->arr1, s->arr2, ftab, nblock);
+		}
+	}
+
+	s->origPtr = -1;
+	for (i = 0; i < s->nblock; i++)
+		if (ptr[i] == 0) {
+			s->origPtr = i; break;
+		};
+
+	AssertH(s->origPtr != -1, 1003);
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                       blocksort.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/archival/bz/bzlib.c b/archival/bz/bzlib.c
new file mode 100644
index 000000000..3125bb0bf
--- /dev/null
+++ b/archival/bz/bzlib.c
@@ -0,0 +1,433 @@
+/*
+ * bzip2 is written by Julian Seward <jseward@bzip.org>.
+ * Adapted for busybox by Denys Vlasenko <vda.linux@googlemail.com>.
+ * See README and LICENSE files in this directory for more information.
+ */
+
+/*-------------------------------------------------------------*/
+/*--- Library top-level functions.                          ---*/
+/*---                                               bzlib.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+This file is part of bzip2/libbzip2, a program and library for
+lossless, block-sorting data compression.
+
+bzip2/libbzip2 version 1.0.4 of 20 December 2006
+Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
+
+Please read the WARNING, DISCLAIMER and PATENTS sections in the
+README file.
+
+This program is released under the terms of the license contained
+in the file LICENSE.
+------------------------------------------------------------------ */
+
+/* CHANGES
+ * 0.9.0    -- original version.
+ * 0.9.0a/b -- no changes in this file.
+ * 0.9.0c   -- made zero-length BZ_FLUSH work correctly in bzCompress().
+ *             fixed bzWrite/bzRead to ignore zero-length requests.
+ *	       fixed bzread to correctly handle read requests after EOF.
+ *             wrong parameter order in call to bzDecompressInit in
+ *             bzBuffToBuffDecompress.  Fixed.
+ */
+
+/* #include "bzlib_private.h" */
+
+/*---------------------------------------------------*/
+/*--- Compression stuff                           ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+#ifndef BZ_NO_STDIO
+static void bz_assert_fail(int errcode)
+{
+	/* if (errcode == 1007) bb_error_msg_and_die("probably bad RAM"); */
+	bb_error_msg_and_die("bzip2 internal error %d", errcode);
+}
+#endif
+
+
+/*---------------------------------------------------*/
+static
+void prepare_new_block(EState* s)
+{
+	int32_t i;
+	s->nblock = 0;
+	s->numZ = 0;
+	s->state_out_pos = 0;
+	BZ_INITIALISE_CRC(s->blockCRC);
+	for (i = 0; i < 256; i++) s->inUse[i] = False;
+	s->blockNo++;
+}
+
+
+/*---------------------------------------------------*/
+static
+ALWAYS_INLINE
+void init_RL(EState* s)
+{
+	s->state_in_ch = 256;
+	s->state_in_len = 0;
+}
+
+
+static
+Bool isempty_RL(EState* s)
+{
+	if (s->state_in_ch < 256 && s->state_in_len > 0)
+		return False;
+	return True;
+}
+
+
+/*---------------------------------------------------*/
+static
+void BZ2_bzCompressInit(bz_stream *strm, int blockSize100k)
+{
+	int32_t n;
+	EState* s;
+
+	s = xzalloc(sizeof(EState));
+	s->strm = strm;
+
+	n        = 100000 * blockSize100k;
+	s->arr1  = xmalloc(n                    * sizeof(uint32_t));
+	s->mtfv  = (uint16_t*)s->arr1;
+	s->ptr   = (uint32_t*)s->arr1;
+	s->arr2  = xmalloc((n + BZ_N_OVERSHOOT) * sizeof(uint32_t));
+	s->block = (UChar*)s->arr2;
+	s->ftab  = xmalloc(65537                * sizeof(uint32_t));
+
+	s->state             = BZ_S_INPUT;
+	s->mode              = BZ_M_RUNNING;
+	s->blockSize100k     = blockSize100k;
+	s->nblockMAX         = n - 19;
+
+	strm->state          = s;
+	/*strm->total_in     = 0;*/
+	strm->total_out = 0;
+	init_RL(s);
+	prepare_new_block(s);
+}
+
+
+/*---------------------------------------------------*/
+static
+void add_pair_to_block(EState* s)
+{
+	int32_t i;
+	UChar ch = (UChar)(s->state_in_ch);
+	for (i = 0; i < s->state_in_len; i++) {
+		BZ_UPDATE_CRC(s->blockCRC, ch);
+	}
+	s->inUse[s->state_in_ch] = True;
+	switch (s->state_in_len) {
+		case 1:
+			s->block[s->nblock] = (UChar)ch; s->nblock++;
+			break;
+		case 2:
+			s->block[s->nblock] = (UChar)ch; s->nblock++;
+			s->block[s->nblock] = (UChar)ch; s->nblock++;
+			break;
+		case 3:
+			s->block[s->nblock] = (UChar)ch; s->nblock++;
+			s->block[s->nblock] = (UChar)ch; s->nblock++;
+			s->block[s->nblock] = (UChar)ch; s->nblock++;
+			break;
+		default:
+			s->inUse[s->state_in_len-4] = True;
+			s->block[s->nblock] = (UChar)ch; s->nblock++;
+			s->block[s->nblock] = (UChar)ch; s->nblock++;
+			s->block[s->nblock] = (UChar)ch; s->nblock++;
+			s->block[s->nblock] = (UChar)ch; s->nblock++;
+			s->block[s->nblock] = ((UChar)(s->state_in_len-4));
+			s->nblock++;
+			break;
+	}
+}
+
+
+/*---------------------------------------------------*/
+static
+void flush_RL(EState* s)
+{
+	if (s->state_in_ch < 256) add_pair_to_block(s);
+	init_RL(s);
+}
+
+
+/*---------------------------------------------------*/
+#define ADD_CHAR_TO_BLOCK(zs, zchh0) \
+{ \
+	uint32_t zchh = (uint32_t)(zchh0); \
+	/*-- fast track the common case --*/ \
+	if (zchh != zs->state_in_ch && zs->state_in_len == 1) { \
+		UChar ch = (UChar)(zs->state_in_ch); \
+		BZ_UPDATE_CRC(zs->blockCRC, ch); \
+		zs->inUse[zs->state_in_ch] = True; \
+		zs->block[zs->nblock] = (UChar)ch; \
+		zs->nblock++; \
+		zs->state_in_ch = zchh; \
+	} \
+	else \
+	/*-- general, uncommon cases --*/ \
+	if (zchh != zs->state_in_ch || \
+		zs->state_in_len == 255) { \
+		if (zs->state_in_ch < 256) \
+			add_pair_to_block(zs); \
+		zs->state_in_ch = zchh; \
+		zs->state_in_len = 1; \
+	} else { \
+		zs->state_in_len++; \
+	} \
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool copy_input_until_stop(EState* s)
+{
+	Bool progress_in = False;
+
+//vda: cannot simplify this until avail_in_expect is removed
+	if (s->mode == BZ_M_RUNNING) {
+		/*-- fast track the common case --*/
+		while (1) {
+			/*-- block full? --*/
+			if (s->nblock >= s->nblockMAX) break;
+			/*-- no input? --*/
+			if (s->strm->avail_in == 0) break;
+			progress_in = True;
+			ADD_CHAR_TO_BLOCK(s, (uint32_t)(*((UChar*)(s->strm->next_in))));
+			s->strm->next_in++;
+			s->strm->avail_in--;
+			/*s->strm->total_in++;*/
+		}
+	} else {
+		/*-- general, uncommon case --*/
+		while (1) {
+			/*-- block full? --*/
+			if (s->nblock >= s->nblockMAX) break;
+			/*-- no input? --*/
+			if (s->strm->avail_in == 0) break;
+			/*-- flush/finish end? --*/
+			if (s->avail_in_expect == 0) break;
+			progress_in = True;
+			ADD_CHAR_TO_BLOCK(s, (uint32_t)(*((UChar*)(s->strm->next_in))));
+			s->strm->next_in++;
+			s->strm->avail_in--;
+			/*s->strm->total_in++;*/
+			s->avail_in_expect--;
+		}
+	}
+	return progress_in;
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool copy_output_until_stop(EState* s)
+{
+	Bool progress_out = False;
+
+	while (1) {
+
+		/*-- no output space? --*/
+		if (s->strm->avail_out == 0) break;
+
+		/*-- block done? --*/
+		if (s->state_out_pos >= s->numZ) break;
+
+		progress_out = True;
+		*(s->strm->next_out) = s->zbits[s->state_out_pos];
+		s->state_out_pos++;
+		s->strm->avail_out--;
+		s->strm->next_out++;
+		s->strm->total_out++;
+	}
+
+	return progress_out;
+}
+
+
+/*---------------------------------------------------*/
+static
+Bool handle_compress(bz_stream *strm)
+{
+	Bool progress_in  = False;
+	Bool progress_out = False;
+	EState* s = strm->state;
+	
+	while (1) {
+		if (s->state == BZ_S_OUTPUT) {
+			progress_out |= copy_output_until_stop(s);
+			if (s->state_out_pos < s->numZ) break;
+			if (s->mode == BZ_M_FINISHING
+			 && s->avail_in_expect == 0
+			 && isempty_RL(s))
+				break;
+			prepare_new_block(s);
+			s->state = BZ_S_INPUT;
+			if (s->mode == BZ_M_FLUSHING
+			 && s->avail_in_expect == 0
+			 && isempty_RL(s))
+				break;
+		}
+
+		if (s->state == BZ_S_INPUT) {
+			progress_in |= copy_input_until_stop(s);
+			if (s->mode != BZ_M_RUNNING && s->avail_in_expect == 0) {
+				flush_RL(s);
+				BZ2_compressBlock(s, (Bool)(s->mode == BZ_M_FINISHING));
+				s->state = BZ_S_OUTPUT;
+			} else
+			if (s->nblock >= s->nblockMAX) {
+				BZ2_compressBlock(s, False);
+				s->state = BZ_S_OUTPUT;
+			} else
+			if (s->strm->avail_in == 0) {
+				break;
+			}
+		}
+
+	}
+
+	return progress_in || progress_out;
+}
+
+
+/*---------------------------------------------------*/
+static
+int BZ2_bzCompress(bz_stream *strm, int action)
+{
+	Bool progress;
+	EState* s;
+	if (strm == NULL) return BZ_PARAM_ERROR;
+	s = strm->state;
+	if (s == NULL) return BZ_PARAM_ERROR;
+	if (s->strm != strm) return BZ_PARAM_ERROR;
+
+	preswitch:
+	switch (s->mode) {
+
+		case BZ_M_IDLE:
+			return BZ_SEQUENCE_ERROR;
+
+		case BZ_M_RUNNING:
+			if (action == BZ_RUN) {
+				progress = handle_compress(strm);
+				return progress ? BZ_RUN_OK : BZ_PARAM_ERROR;
+			}
+			else
+			if (action == BZ_FLUSH) {
+				s->avail_in_expect = strm->avail_in;
+				s->mode = BZ_M_FLUSHING;
+				goto preswitch;
+			}
+			else
+			if (action == BZ_FINISH) {
+				s->avail_in_expect = strm->avail_in;
+				s->mode = BZ_M_FINISHING;
+				goto preswitch;
+			}
+			else
+				return BZ_PARAM_ERROR;
+
+		case BZ_M_FLUSHING:
+			if (action != BZ_FLUSH) return BZ_SEQUENCE_ERROR;
+			if (s->avail_in_expect != s->strm->avail_in)
+				return BZ_SEQUENCE_ERROR;
+			progress = handle_compress(strm);
+			if (s->avail_in_expect > 0 || !isempty_RL(s) || s->state_out_pos < s->numZ)
+				return BZ_FLUSH_OK;
+			s->mode = BZ_M_RUNNING;
+			return BZ_RUN_OK;
+
+		case BZ_M_FINISHING:
+			if (action != BZ_FINISH) return BZ_SEQUENCE_ERROR;
+			if (s->avail_in_expect != s->strm->avail_in)
+				return BZ_SEQUENCE_ERROR;
+			progress = handle_compress(strm);
+			if (!progress) return BZ_SEQUENCE_ERROR;
+			if (s->avail_in_expect > 0 || !isempty_RL(s) || s->state_out_pos < s->numZ)
+				return BZ_FINISH_OK;
+			s->mode = BZ_M_IDLE;
+			return BZ_STREAM_END;
+	}
+	return BZ_OK; /*--not reached--*/
+}
+
+
+/*---------------------------------------------------*/
+static
+int BZ2_bzCompressEnd(bz_stream *strm)
+{
+	EState* s;
+	if (strm == NULL) return BZ_PARAM_ERROR;
+	s = strm->state;
+	if (s == NULL) return BZ_PARAM_ERROR;
+	if (s->strm != strm) return BZ_PARAM_ERROR;
+
+	if (s->arr1 != NULL) free(s->arr1);
+	if (s->arr2 != NULL) free(s->arr2);
+	if (s->ftab != NULL) free(s->ftab);
+	free(strm->state);
+
+	strm->state = NULL;
+
+	return BZ_OK;
+}
+
+
+/*---------------------------------------------------*/
+/*--- Misc convenience stuff                      ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+#ifdef EXAMPLE_CODE_FOR_MEM_TO_MEM_COMPRESSION
+static
+int BZ2_bzBuffToBuffCompress(char* dest,
+		unsigned int* destLen,
+		char*         source,
+		unsigned int  sourceLen,
+		int           blockSize100k)
+{
+	bz_stream strm;
+	int ret;
+
+	if (dest == NULL || destLen == NULL ||
+		 source == NULL ||
+		 blockSize100k < 1 || blockSize100k > 9)
+		return BZ_PARAM_ERROR;
+
+	BZ2_bzCompressInit(&strm, blockSize100k);
+
+	strm.next_in = source;
+	strm.next_out = dest;
+	strm.avail_in = sourceLen;
+	strm.avail_out = *destLen;
+
+	ret = BZ2_bzCompress(&strm, BZ_FINISH);
+	if (ret == BZ_FINISH_OK) goto output_overflow;
+	if (ret != BZ_STREAM_END) goto errhandler;
+
+	/* normal termination */
+	*destLen -= strm.avail_out;
+	BZ2_bzCompressEnd(&strm);
+	return BZ_OK;
+
+	output_overflow:
+	BZ2_bzCompressEnd(&strm);
+	return BZ_OUTBUFF_FULL;
+
+	errhandler:
+	BZ2_bzCompressEnd(&strm);
+	return ret;
+}
+#endif
+
+/*-------------------------------------------------------------*/
+/*--- end                                           bzlib.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/archival/bz/bzlib.h b/archival/bz/bzlib.h
new file mode 100644
index 000000000..805e9b328
--- /dev/null
+++ b/archival/bz/bzlib.h
@@ -0,0 +1,63 @@
+/*
+ * bzip2 is written by Julian Seward <jseward@bzip.org>.
+ * Adapted for busybox by Denys Vlasenko <vda.linux@googlemail.com>.
+ * See README and LICENSE files in this directory for more information.
+ */
+
+/*-------------------------------------------------------------*/
+/*--- Public header file for the library.                   ---*/
+/*---                                               bzlib.h ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+This file is part of bzip2/libbzip2, a program and library for
+lossless, block-sorting data compression.
+
+bzip2/libbzip2 version 1.0.4 of 20 December 2006
+Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
+
+Please read the WARNING, DISCLAIMER and PATENTS sections in the
+README file.
+
+This program is released under the terms of the license contained
+in the file LICENSE.
+------------------------------------------------------------------ */
+
+#define BZ_RUN               0
+#define BZ_FLUSH             1
+#define BZ_FINISH            2
+
+#define BZ_OK                0
+#define BZ_RUN_OK            1
+#define BZ_FLUSH_OK          2
+#define BZ_FINISH_OK         3
+#define BZ_STREAM_END        4
+#define BZ_SEQUENCE_ERROR    (-1)
+#define BZ_PARAM_ERROR       (-2)
+#define BZ_MEM_ERROR         (-3)
+#define BZ_DATA_ERROR        (-4)
+#define BZ_DATA_ERROR_MAGIC  (-5)
+#define BZ_IO_ERROR          (-6)
+#define BZ_UNEXPECTED_EOF    (-7)
+#define BZ_OUTBUFF_FULL      (-8)
+#define BZ_CONFIG_ERROR      (-9)
+
+typedef struct bz_stream {
+	char *next_in;
+	char *next_out;
+	unsigned avail_in;
+	unsigned avail_out;
+	/*unsigned long long total_in;*/
+	unsigned long long total_out;
+	void *state;
+} bz_stream;
+
+/*-- Core (low-level) library functions --*/
+
+static void BZ2_bzCompressInit(bz_stream *strm, int blockSize100k);
+static int BZ2_bzCompress(bz_stream *strm, int action);
+static int BZ2_bzCompressEnd(bz_stream *strm);
+
+/*-------------------------------------------------------------*/
+/*--- end                                           bzlib.h ---*/
+/*-------------------------------------------------------------*/
diff --git a/archival/bz/bzlib_private.h b/archival/bz/bzlib_private.h
new file mode 100644
index 000000000..24ffbee9c
--- /dev/null
+++ b/archival/bz/bzlib_private.h
@@ -0,0 +1,234 @@
+/*
+ * bzip2 is written by Julian Seward <jseward@bzip.org>.
+ * Adapted for busybox by Denys Vlasenko <vda.linux@googlemail.com>.
+ * See README and LICENSE files in this directory for more information.
+ */
+
+/*-------------------------------------------------------------*/
+/*--- Private header file for the library.                  ---*/
+/*---                                       bzlib_private.h ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+This file is part of bzip2/libbzip2, a program and library for
+lossless, block-sorting data compression.
+
+bzip2/libbzip2 version 1.0.4 of 20 December 2006
+Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
+
+Please read the WARNING, DISCLAIMER and PATENTS sections in the
+README file.
+
+This program is released under the terms of the license contained
+in the file LICENSE.
+------------------------------------------------------------------ */
+
+/* #include "bzlib.h" */
+
+#define BZ_DEBUG 0
+//#define BZ_NO_STDIO 1 - does not work
+
+
+/*-- General stuff. --*/
+
+typedef unsigned char Bool;
+typedef unsigned char UChar;
+
+#define True  ((Bool)1)
+#define False ((Bool)0)
+
+static void bz_assert_fail(int errcode) ATTRIBUTE_NORETURN;
+#define AssertH(cond, errcode) \
+{ \
+	if (!(cond)) \
+		bz_assert_fail(errcode); \
+}
+
+#if BZ_DEBUG
+#define AssertD(cond, msg) \
+{ \
+	if (!(cond)) \
+		bb_error_msg_and_die("(debug build): internal error %s", msg); \
+}
+#else
+#define AssertD(cond, msg) do { } while (0)
+#endif
+
+
+/*-- Header bytes. --*/
+
+#define BZ_HDR_B 0x42   /* 'B' */
+#define BZ_HDR_Z 0x5a   /* 'Z' */
+#define BZ_HDR_h 0x68   /* 'h' */
+#define BZ_HDR_0 0x30   /* '0' */
+
+#define BZ_HDR_BZh0 0x425a6830
+
+/*-- Constants for the back end. --*/
+
+#define BZ_MAX_ALPHA_SIZE 258
+#define BZ_MAX_CODE_LEN    23
+
+#define BZ_RUNA 0
+#define BZ_RUNB 1
+
+#define BZ_N_GROUPS 6
+#define BZ_G_SIZE   50
+#define BZ_N_ITERS  4
+
+#define BZ_MAX_SELECTORS (2 + (900000 / BZ_G_SIZE))
+
+
+/*-- Stuff for randomising repetitive blocks. --*/
+
+static const int32_t BZ2_rNums[512];
+
+#define BZ_RAND_DECLS \
+	int32_t rNToGo; \
+	int32_t rTPos \
+
+#define BZ_RAND_INIT_MASK \
+	s->rNToGo = 0; \
+	s->rTPos  = 0 \
+
+#define BZ_RAND_MASK ((s->rNToGo == 1) ? 1 : 0)
+
+#define BZ_RAND_UPD_MASK \
+{ \
+	if (s->rNToGo == 0) { \
+		s->rNToGo = BZ2_rNums[s->rTPos]; \
+		s->rTPos++; \
+		if (s->rTPos == 512) s->rTPos = 0; \
+	} \
+	s->rNToGo--; \
+}
+
+
+/*-- Stuff for doing CRCs. --*/
+
+static const uint32_t BZ2_crc32Table[256];
+
+#define BZ_INITIALISE_CRC(crcVar) \
+{ \
+	crcVar = 0xffffffffL; \
+}
+
+#define BZ_FINALISE_CRC(crcVar) \
+{ \
+	crcVar = ~(crcVar); \
+}
+
+#define BZ_UPDATE_CRC(crcVar,cha) \
+{ \
+	crcVar = (crcVar << 8) ^ BZ2_crc32Table[(crcVar >> 24) ^ ((UChar)cha)]; \
+}
+
+
+/*-- States and modes for compression. --*/
+
+#define BZ_M_IDLE      1
+#define BZ_M_RUNNING   2
+#define BZ_M_FLUSHING  3
+#define BZ_M_FINISHING 4
+
+#define BZ_S_OUTPUT    1
+#define BZ_S_INPUT     2
+
+#define BZ_N_RADIX 2
+#define BZ_N_QSORT 12
+#define BZ_N_SHELL 18
+#define BZ_N_OVERSHOOT (BZ_N_RADIX + BZ_N_QSORT + BZ_N_SHELL + 2)
+
+
+/*-- Structure holding all the compression-side stuff. --*/
+
+typedef struct EState {
+	/* pointer back to the struct bz_stream */
+	bz_stream *strm;
+
+	/* mode this stream is in, and whether inputting */
+	/* or outputting data */
+	int32_t  mode;
+	int32_t  state;
+
+	/* remembers avail_in when flush/finish requested */
+	uint32_t avail_in_expect; //vda: do we need this?
+
+	/* for doing the block sorting */
+	uint32_t *arr1;
+	uint32_t *arr2;
+	uint32_t *ftab;
+	int32_t  origPtr;
+
+	/* aliases for arr1 and arr2 */
+	uint32_t *ptr;
+	UChar    *block;
+	uint16_t *mtfv;
+	UChar    *zbits;
+
+	/* run-length-encoding of the input */
+	uint32_t state_in_ch;
+	int32_t  state_in_len;
+	BZ_RAND_DECLS;
+
+	/* input and output limits and current posns */
+	int32_t  nblock;
+	int32_t  nblockMAX;
+	int32_t  numZ;
+	int32_t  state_out_pos;
+
+	/* the buffer for bit stream creation */
+	uint32_t bsBuff;
+	int32_t  bsLive;
+
+	/* block and combined CRCs */
+	uint32_t blockCRC;
+	uint32_t combinedCRC;
+
+	/* misc administratium */
+	int32_t  blockNo;
+	int32_t  blockSize100k;
+
+	/* stuff for coding the MTF values */
+	int32_t  nMTF;
+
+	/* map of bytes used in block */
+	int32_t  nInUse;
+	Bool     inUse[256];
+	UChar    unseqToSeq[256];
+
+	/* stuff for coding the MTF values */
+	int32_t  mtfFreq    [BZ_MAX_ALPHA_SIZE];
+	UChar    selector   [BZ_MAX_SELECTORS];
+	UChar    selectorMtf[BZ_MAX_SELECTORS];
+
+	UChar    len     [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+	int32_t  code    [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+	int32_t  rfreq   [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+#ifdef FAST_GROUP6
+	/* second dimension: only 3 needed; 4 makes index calculations faster */
+	uint32_t len_pack[BZ_MAX_ALPHA_SIZE][4];
+#endif
+} EState;
+
+
+/*-- compression. --*/
+
+static void
+BZ2_blockSort(EState*);
+
+static void
+BZ2_compressBlock(EState*, Bool);
+
+static void
+BZ2_bsInitWrite(EState*);
+
+static void
+BZ2_hbAssignCodes(int32_t*, UChar*, int32_t, int32_t, int32_t);
+
+static void
+BZ2_hbMakeCodeLengths(UChar*, int32_t*, int32_t, int32_t);
+
+/*-------------------------------------------------------------*/
+/*--- end                                   bzlib_private.h ---*/
+/*-------------------------------------------------------------*/
diff --git a/archival/bz/compress.c b/archival/bz/compress.c
new file mode 100644
index 000000000..54426dcc7
--- /dev/null
+++ b/archival/bz/compress.c
@@ -0,0 +1,671 @@
+/*
+ * bzip2 is written by Julian Seward <jseward@bzip.org>.
+ * Adapted for busybox by Denys Vlasenko <vda.linux@googlemail.com>.
+ * See README and LICENSE files in this directory for more information.
+ */
+
+/*-------------------------------------------------------------*/
+/*--- Compression machinery (not incl block sorting)        ---*/
+/*---                                            compress.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+This file is part of bzip2/libbzip2, a program and library for
+lossless, block-sorting data compression.
+
+bzip2/libbzip2 version 1.0.4 of 20 December 2006
+Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
+
+Please read the WARNING, DISCLAIMER and PATENTS sections in the
+README file.
+
+This program is released under the terms of the license contained
+in the file LICENSE.
+------------------------------------------------------------------ */
+
+/* CHANGES
+ * 0.9.0    -- original version.
+ * 0.9.0a/b -- no changes in this file.
+ * 0.9.0c   -- changed setting of nGroups in sendMTFValues()
+ *             so as to do a bit better on small files
+*/
+
+/* #include "bzlib_private.h" */
+
+/*---------------------------------------------------*/
+/*--- Bit stream I/O                              ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+static
+void BZ2_bsInitWrite(EState* s)
+{
+	s->bsLive = 0;
+	s->bsBuff = 0;
+}
+
+
+/*---------------------------------------------------*/
+static NOINLINE
+void bsFinishWrite(EState* s)
+{
+	while (s->bsLive > 0) {
+		s->zbits[s->numZ] = (UChar)(s->bsBuff >> 24);
+		s->numZ++;
+		s->bsBuff <<= 8;
+		s->bsLive -= 8;
+	}
+}
+
+
+/*---------------------------------------------------*/
+static
+/* Forced inlining results in +600 bytes code,
+ * 2% faster compression. Not worth it. */
+/*ALWAYS_INLINE*/
+void bsW(EState* s, int32_t n, uint32_t v)
+{
+	while (s->bsLive >= 8) {
+		s->zbits[s->numZ] = (UChar)(s->bsBuff >> 24);
+		s->numZ++;
+		s->bsBuff <<= 8;
+		s->bsLive -= 8;
+	}
+	s->bsBuff |= (v << (32 - s->bsLive - n));
+	s->bsLive += n;
+}
+
+
+/*---------------------------------------------------*/
+static
+void bsPutU32(EState* s, uint32_t u)
+{
+	bsW(s, 8, (u >> 24) & 0xff);
+	bsW(s, 8, (u >> 16) & 0xff);
+	bsW(s, 8, (u >>  8) & 0xff);
+	bsW(s, 8,  u        & 0xff);
+}
+
+
+/*---------------------------------------------------*/
+static
+void bsPutUChar(EState* s, UChar c)
+{
+	bsW(s, 8, (uint32_t)c);
+}
+
+
+/*---------------------------------------------------*/
+/*--- The back end proper                         ---*/
+/*---------------------------------------------------*/
+
+/*---------------------------------------------------*/
+static
+void makeMaps_e(EState* s)
+{
+	int32_t i;
+	s->nInUse = 0;
+	for (i = 0; i < 256; i++) {
+		if (s->inUse[i]) {
+			s->unseqToSeq[i] = s->nInUse;
+			s->nInUse++;
+		}
+	}
+}
+
+
+/*---------------------------------------------------*/
+static NOINLINE
+void generateMTFValues(EState* s)
+{
+	UChar   yy[256];
+	int32_t i, j;
+	int32_t zPend;
+	int32_t wr;
+	int32_t EOB;
+
+	/*
+	 * After sorting (eg, here),
+	 * s->arr1[0 .. s->nblock-1] holds sorted order,
+	 * and
+	 * ((UChar*)s->arr2)[0 .. s->nblock-1]
+	 * holds the original block data.
+	 *
+	 * The first thing to do is generate the MTF values,
+	 * and put them in
+	 *	((uint16_t*)s->arr1)[0 .. s->nblock-1].
+	 * Because there are strictly fewer or equal MTF values
+	 * than block values, ptr values in this area are overwritten
+	 * with MTF values only when they are no longer needed.
+	 *
+	 * The final compressed bitstream is generated into the
+	 * area starting at
+	 *	(UChar*) (&((UChar*)s->arr2)[s->nblock])
+	 *
+	 * These storage aliases are set up in bzCompressInit(),
+	 * except for the last one, which is arranged in
+	 * compressBlock().
+	 */
+	uint32_t* ptr   = s->ptr;
+	UChar*    block = s->block;
+	uint16_t* mtfv  = s->mtfv;
+
+	makeMaps_e(s);
+	EOB = s->nInUse+1;
+
+	for (i = 0; i <= EOB; i++)
+		s->mtfFreq[i] = 0;
+
+	wr = 0;
+	zPend = 0;
+	for (i = 0; i < s->nInUse; i++)
+		yy[i] = (UChar) i;
+
+	for (i = 0; i < s->nblock; i++) {
+		UChar ll_i;
+		AssertD(wr <= i, "generateMTFValues(1)");
+		j = ptr[i]-1;
+		if (j < 0)
+			j += s->nblock;
+		ll_i = s->unseqToSeq[block[j]];
+		AssertD(ll_i < s->nInUse, "generateMTFValues(2a)");
+
+		if (yy[0] == ll_i) {
+			zPend++;
+		} else {
+			if (zPend > 0) {
+				zPend--;
+				while (1) {
+					if (zPend & 1) {
+						mtfv[wr] = BZ_RUNB; wr++;
+						s->mtfFreq[BZ_RUNB]++;
+					} else {
+						mtfv[wr] = BZ_RUNA; wr++;
+						s->mtfFreq[BZ_RUNA]++;
+					}
+					if (zPend < 2) break;
+					zPend = (zPend - 2) / 2;
+				};
+				zPend = 0;
+			}
+			{
+				register UChar  rtmp;
+				register UChar* ryy_j;
+				register UChar  rll_i;
+				rtmp  = yy[1];
+				yy[1] = yy[0];
+				ryy_j = &(yy[1]);
+				rll_i = ll_i;
+				while (rll_i != rtmp) {
+					register UChar rtmp2;
+					ryy_j++;
+					rtmp2  = rtmp;
+					rtmp   = *ryy_j;
+					*ryy_j = rtmp2;
+				};
+				yy[0] = rtmp;
+				j = ryy_j - &(yy[0]);
+				mtfv[wr] = j+1;
+				wr++;
+				s->mtfFreq[j+1]++;
+			}
+
+		}
+	}
+
+	if (zPend > 0) {
+		zPend--;
+		while (1) {
+			if (zPend & 1) {
+				mtfv[wr] = BZ_RUNB; wr++;
+				s->mtfFreq[BZ_RUNB]++;
+			} else {
+				mtfv[wr] = BZ_RUNA; wr++;
+				s->mtfFreq[BZ_RUNA]++;
+			}
+			if (zPend < 2)
+				break;
+			zPend = (zPend - 2) / 2;
+		};
+		zPend = 0;
+	}
+
+	mtfv[wr] = EOB;
+	wr++;
+	s->mtfFreq[EOB]++;
+
+	s->nMTF = wr;
+}
+
+
+/*---------------------------------------------------*/
+#define BZ_LESSER_ICOST  0
+#define BZ_GREATER_ICOST 15
+
+static NOINLINE
+void sendMTFValues(EState* s)
+{
+	int32_t v, t, i, j, gs, ge, totc, bt, bc, iter;
+	int32_t nSelectors, alphaSize, minLen, maxLen, selCtr;
+	int32_t nGroups, nBytes;
+
+	/*
+	 * UChar  len [BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+	 * is a global since the decoder also needs it.
+	 *
+	 * int32_t  code[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+	 * int32_t  rfreq[BZ_N_GROUPS][BZ_MAX_ALPHA_SIZE];
+	 * are also globals only used in this proc.
+	 * Made global to keep stack frame size small.
+	 */
+
+	uint16_t cost[BZ_N_GROUPS];
+	int32_t  fave[BZ_N_GROUPS];
+
+	uint16_t* mtfv = s->mtfv;
+
+	alphaSize = s->nInUse+2;
+	for (t = 0; t < BZ_N_GROUPS; t++)
+		for (v = 0; v < alphaSize; v++)
+			s->len[t][v] = BZ_GREATER_ICOST;
+
+	/*--- Decide how many coding tables to use ---*/
+	AssertH(s->nMTF > 0, 3001);
+	if (s->nMTF < 200)  nGroups = 2; else
+	if (s->nMTF < 600)  nGroups = 3; else
+	if (s->nMTF < 1200) nGroups = 4; else
+	if (s->nMTF < 2400) nGroups = 5; else
+	nGroups = 6;
+
+	/*--- Generate an initial set of coding tables ---*/
+	{
+		int32_t nPart, remF, tFreq, aFreq;
+
+		nPart = nGroups;
+		remF  = s->nMTF;
+		gs = 0;
+		while (nPart > 0) {
+			tFreq = remF / nPart;
+			ge = gs-1;
+			aFreq = 0;
+			while (aFreq < tFreq && ge < alphaSize-1) {
+				ge++;
+				aFreq += s->mtfFreq[ge];
+			}
+
+			if (ge > gs
+			 && nPart != nGroups && nPart != 1
+			 && ((nGroups-nPart) % 2 == 1)
+			) {
+				aFreq -= s->mtfFreq[ge];
+				ge--;
+			}
+
+			for (v = 0; v < alphaSize; v++)
+				if (v >= gs && v <= ge)
+					s->len[nPart-1][v] = BZ_LESSER_ICOST;
+				else
+					s->len[nPart-1][v] = BZ_GREATER_ICOST;
+
+			nPart--;
+			gs = ge+1;
+			remF -= aFreq;
+		}
+	}
+
+	/*
+	 * Iterate up to BZ_N_ITERS times to improve the tables.
+	 */
+	for (iter = 0; iter < BZ_N_ITERS; iter++) {
+		for (t = 0; t < nGroups; t++)
+			fave[t] = 0;
+
+		for (t = 0; t < nGroups; t++)
+			for (v = 0; v < alphaSize; v++)
+				s->rfreq[t][v] = 0;
+
+#ifdef FAST_GROUP6
+		/*
+		 * Set up an auxiliary length table which is used to fast-track
+		 * the common case (nGroups == 6).
+		 */
+		if (nGroups == 6) {
+			for (v = 0; v < alphaSize; v++) {
+				s->len_pack[v][0] = (s->len[1][v] << 16) | s->len[0][v];
+				s->len_pack[v][1] = (s->len[3][v] << 16) | s->len[2][v];
+				s->len_pack[v][2] = (s->len[5][v] << 16) | s->len[4][v];
+			}
+		}
+#endif
+
+		nSelectors = 0;
+		totc = 0;
+		gs = 0;
+		while (1) {
+			/*--- Set group start & end marks. --*/
+			if (gs >= s->nMTF)
+				break;
+			ge = gs + BZ_G_SIZE - 1;
+			if (ge >= s->nMTF)
+				ge = s->nMTF-1;
+
+			/*
+			 * Calculate the cost of this group as coded
+			 * by each of the coding tables.
+			 */
+			for (t = 0; t < nGroups; t++)
+				cost[t] = 0;
+#ifdef FAST_GROUP6
+			if (nGroups == 6 && 50 == ge-gs+1) {
+				/*--- fast track the common case ---*/
+				register uint32_t cost01, cost23, cost45;
+				register uint16_t icv;
+				cost01 = cost23 = cost45 = 0;
+#define BZ_ITER(nn) \
+	icv = mtfv[gs+(nn)]; \
+	cost01 += s->len_pack[icv][0]; \
+	cost23 += s->len_pack[icv][1]; \
+	cost45 += s->len_pack[icv][2];
+				BZ_ITER(0);  BZ_ITER(1);  BZ_ITER(2);  BZ_ITER(3);  BZ_ITER(4);
+				BZ_ITER(5);  BZ_ITER(6);  BZ_ITER(7);  BZ_ITER(8);  BZ_ITER(9);
+				BZ_ITER(10); BZ_ITER(11); BZ_ITER(12); BZ_ITER(13); BZ_ITER(14);
+				BZ_ITER(15); BZ_ITER(16); BZ_ITER(17); BZ_ITER(18); BZ_ITER(19);
+				BZ_ITER(20); BZ_ITER(21); BZ_ITER(22); BZ_ITER(23); BZ_ITER(24);
+				BZ_ITER(25); BZ_ITER(26); BZ_ITER(27); BZ_ITER(28); BZ_ITER(29);
+				BZ_ITER(30); BZ_ITER(31); BZ_ITER(32); BZ_ITER(33); BZ_ITER(34);
+				BZ_ITER(35); BZ_ITER(36); BZ_ITER(37); BZ_ITER(38); BZ_ITER(39);
+				BZ_ITER(40); BZ_ITER(41); BZ_ITER(42); BZ_ITER(43); BZ_ITER(44);
+				BZ_ITER(45); BZ_ITER(46); BZ_ITER(47); BZ_ITER(48); BZ_ITER(49);
+#undef BZ_ITER
+				cost[0] = cost01 & 0xffff; cost[1] = cost01 >> 16;
+				cost[2] = cost23 & 0xffff; cost[3] = cost23 >> 16;
+				cost[4] = cost45 & 0xffff; cost[5] = cost45 >> 16;
+
+			} else
+#endif
+			{
+				/*--- slow version which correctly handles all situations ---*/
+				for (i = gs; i <= ge; i++) {
+					uint16_t icv = mtfv[i];
+					for (t = 0; t < nGroups; t++)
+						cost[t] += s->len[t][icv];
+				}
+			}
+			/*
+			 * Find the coding table which is best for this group,
+			 * and record its identity in the selector table.
+			 */
+			bc = 999999999;
+			bt = -1;
+			//bc = cost[0];
+			//bt = 0;
+			for (t = 0; t < nGroups; t++) {
+				if (cost[t] < bc) {
+					bc = cost[t];
+					bt = t;
+				}
+			}
+			totc += bc;
+			fave[bt]++;
+			s->selector[nSelectors] = bt;
+			nSelectors++;
+
+			/*
+			 * Increment the symbol frequencies for the selected table.
+			 */
+/* ~0.5% faster compress. +800 bytes */ 
+#if 0
+			if (nGroups == 6 && 50 == ge-gs+1) {
+				/*--- fast track the common case ---*/
+#define BZ_ITUR(nn) s->rfreq[bt][mtfv[gs + (nn)]]++
+				BZ_ITUR(0);  BZ_ITUR(1);  BZ_ITUR(2);  BZ_ITUR(3);  BZ_ITUR(4);
+				BZ_ITUR(5);  BZ_ITUR(6);  BZ_ITUR(7);  BZ_ITUR(8);  BZ_ITUR(9);
+				BZ_ITUR(10); BZ_ITUR(11); BZ_ITUR(12); BZ_ITUR(13); BZ_ITUR(14);
+				BZ_ITUR(15); BZ_ITUR(16); BZ_ITUR(17); BZ_ITUR(18); BZ_ITUR(19);
+				BZ_ITUR(20); BZ_ITUR(21); BZ_ITUR(22); BZ_ITUR(23); BZ_ITUR(24);
+				BZ_ITUR(25); BZ_ITUR(26); BZ_ITUR(27); BZ_ITUR(28); BZ_ITUR(29);
+				BZ_ITUR(30); BZ_ITUR(31); BZ_ITUR(32); BZ_ITUR(33); BZ_ITUR(34);
+				BZ_ITUR(35); BZ_ITUR(36); BZ_ITUR(37); BZ_ITUR(38); BZ_ITUR(39);
+				BZ_ITUR(40); BZ_ITUR(41); BZ_ITUR(42); BZ_ITUR(43); BZ_ITUR(44);
+				BZ_ITUR(45); BZ_ITUR(46); BZ_ITUR(47); BZ_ITUR(48); BZ_ITUR(49);
+#undef BZ_ITUR
+				gs = ge+1;
+			} else
+#endif
+			{
+				/*--- slow version which correctly handles all situations ---*/
+				while (gs <= ge) {
+					s->rfreq[bt][mtfv[gs]]++;
+					gs++;
+				}
+				/* already is: gs = ge+1; */
+			}
+		}
+
+		/*
+		 * Recompute the tables based on the accumulated frequencies.
+		 */
+		/* maxLen was changed from 20 to 17 in bzip2-1.0.3.  See
+		 * comment in huffman.c for details. */
+		for (t = 0; t < nGroups; t++)
+			BZ2_hbMakeCodeLengths(&(s->len[t][0]), &(s->rfreq[t][0]), alphaSize, 17 /*20*/);
+	}
+
+	AssertH(nGroups < 8, 3002);
+	AssertH(nSelectors < 32768 && nSelectors <= (2 + (900000 / BZ_G_SIZE)),	3003);
+
+	/*--- Compute MTF values for the selectors. ---*/
+	{
+		UChar pos[BZ_N_GROUPS], ll_i, tmp2, tmp;
+
+		for (i = 0; i < nGroups; i++)
+			pos[i] = i;
+		for (i = 0; i < nSelectors; i++) {
+			ll_i = s->selector[i];
+			j = 0;
+			tmp = pos[j];
+			while (ll_i != tmp) {
+				j++;
+				tmp2 = tmp;
+				tmp = pos[j];
+				pos[j] = tmp2;
+			};
+			pos[0] = tmp;
+			s->selectorMtf[i] = j;
+		}
+	};
+
+	/*--- Assign actual codes for the tables. --*/
+	for (t = 0; t < nGroups; t++) {
+		minLen = 32;
+		maxLen = 0;
+		for (i = 0; i < alphaSize; i++) {
+			if (s->len[t][i] > maxLen) maxLen = s->len[t][i];
+			if (s->len[t][i] < minLen) minLen = s->len[t][i];
+		}
+		AssertH(!(maxLen > 17 /*20*/), 3004);
+		AssertH(!(minLen < 1), 3005);
+		BZ2_hbAssignCodes(&(s->code[t][0]), &(s->len[t][0]), minLen, maxLen, alphaSize);
+	}
+
+	/*--- Transmit the mapping table. ---*/
+	{
+		Bool inUse16[16];
+		for (i = 0; i < 16; i++) {
+			inUse16[i] = False;
+			for (j = 0; j < 16; j++)
+				if (s->inUse[i * 16 + j])
+					inUse16[i] = True;
+		}
+	
+		nBytes = s->numZ;
+		for (i = 0; i < 16; i++) {
+			if (inUse16[i])
+				bsW(s, 1, 1);
+			else
+				bsW(s, 1, 0);
+		}
+
+		for (i = 0; i < 16; i++) {
+			if (inUse16[i]) {
+				for (j = 0; j < 16; j++) {
+					if (s->inUse[i * 16 + j])
+						bsW(s, 1, 1);
+					else
+						bsW(s, 1, 0);
+				}
+			}
+		}
+	}
+
+	/*--- Now the selectors. ---*/
+	nBytes = s->numZ;
+	bsW(s, 3, nGroups);
+	bsW(s, 15, nSelectors);
+	for (i = 0; i < nSelectors; i++) {
+		for (j = 0; j < s->selectorMtf[i]; j++)
+			bsW(s, 1, 1);
+		bsW(s, 1, 0);
+	}
+
+	/*--- Now the coding tables. ---*/
+	nBytes = s->numZ;
+
+	for (t = 0; t < nGroups; t++) {
+		int32_t curr = s->len[t][0];
+		bsW(s, 5, curr);
+		for (i = 0; i < alphaSize; i++) {
+			while (curr < s->len[t][i]) { bsW(s, 2, 2); curr++; /* 10 */ };
+			while (curr > s->len[t][i]) { bsW(s, 2, 3); curr--; /* 11 */ };
+			bsW(s, 1, 0);
+		}
+	}
+
+	/*--- And finally, the block data proper ---*/
+	nBytes = s->numZ;
+	selCtr = 0;
+	gs = 0;
+	while (1) {
+		if (gs >= s->nMTF)
+			break;
+		ge = gs + BZ_G_SIZE - 1;
+		if (ge >= s->nMTF)
+			ge = s->nMTF-1;
+		AssertH(s->selector[selCtr] < nGroups, 3006);
+
+/* Costs 1300 bytes and is _slower_ (on Intel Core 2) */
+#if 0
+		if (nGroups == 6 && 50 == ge-gs+1) {
+			/*--- fast track the common case ---*/
+			uint16_t mtfv_i;
+			UChar* s_len_sel_selCtr	= &(s->len[s->selector[selCtr]][0]);
+			int32_t* s_code_sel_selCtr = &(s->code[s->selector[selCtr]][0]);
+#define BZ_ITAH(nn) \
+	mtfv_i = mtfv[gs+(nn)]; \
+	bsW(s, s_len_sel_selCtr[mtfv_i], s_code_sel_selCtr[mtfv_i])
+			BZ_ITAH(0);  BZ_ITAH(1);  BZ_ITAH(2);  BZ_ITAH(3);  BZ_ITAH(4);
+			BZ_ITAH(5);  BZ_ITAH(6);  BZ_ITAH(7);  BZ_ITAH(8);  BZ_ITAH(9);
+			BZ_ITAH(10); BZ_ITAH(11); BZ_ITAH(12); BZ_ITAH(13); BZ_ITAH(14);
+			BZ_ITAH(15); BZ_ITAH(16); BZ_ITAH(17); BZ_ITAH(18); BZ_ITAH(19);
+			BZ_ITAH(20); BZ_ITAH(21); BZ_ITAH(22); BZ_ITAH(23); BZ_ITAH(24);
+			BZ_ITAH(25); BZ_ITAH(26); BZ_ITAH(27); BZ_ITAH(28); BZ_ITAH(29);
+			BZ_ITAH(30); BZ_ITAH(31); BZ_ITAH(32); BZ_ITAH(33); BZ_ITAH(34);
+			BZ_ITAH(35); BZ_ITAH(36); BZ_ITAH(37); BZ_ITAH(38); BZ_ITAH(39);
+			BZ_ITAH(40); BZ_ITAH(41); BZ_ITAH(42); BZ_ITAH(43); BZ_ITAH(44);
+			BZ_ITAH(45); BZ_ITAH(46); BZ_ITAH(47); BZ_ITAH(48); BZ_ITAH(49);
+#undef BZ_ITAH
+			gs = ge+1;
+		} else
+#endif
+		{
+			/*--- slow version which correctly handles all situations ---*/
+			/* code is bit bigger, but moves multiply out of the loop */
+			UChar*   s_len_sel_selCtr  = &(s->len [s->selector[selCtr]][0]);
+			int32_t* s_code_sel_selCtr = &(s->code[s->selector[selCtr]][0]);
+			while (gs <= ge) {
+				bsW(s,
+					s_len_sel_selCtr[mtfv[gs]],
+					s_code_sel_selCtr[mtfv[gs]]
+				);
+				gs++;
+			}
+			/* already is: gs = ge+1; */
+		}
+		selCtr++;
+	}
+	AssertH(selCtr == nSelectors, 3007);
+}
+
+
+/*---------------------------------------------------*/
+static
+void BZ2_compressBlock(EState* s, Bool is_last_block)
+{
+	if (s->nblock > 0) {
+		BZ_FINALISE_CRC(s->blockCRC);
+		s->combinedCRC = (s->combinedCRC << 1) | (s->combinedCRC >> 31);
+		s->combinedCRC ^= s->blockCRC;
+		if (s->blockNo > 1)
+			s->numZ = 0;
+
+		BZ2_blockSort(s);
+	}
+
+	s->zbits = (UChar*) (&((UChar*)s->arr2)[s->nblock]);
+
+	/*-- If this is the first block, create the stream header. --*/
+	if (s->blockNo == 1) {
+		BZ2_bsInitWrite(s);
+		/*bsPutUChar(s, BZ_HDR_B);*/
+		/*bsPutUChar(s, BZ_HDR_Z);*/
+		/*bsPutUChar(s, BZ_HDR_h);*/
+		/*bsPutUChar(s, (UChar)(BZ_HDR_0 + s->blockSize100k));*/
+		bsPutU32(s, BZ_HDR_BZh0 + s->blockSize100k);
+	}
+
+	if (s->nblock > 0) {
+		/*bsPutUChar(s, 0x31);*/
+		/*bsPutUChar(s, 0x41);*/
+		/*bsPutUChar(s, 0x59);*/
+		/*bsPutUChar(s, 0x26);*/
+		bsPutU32(s, 0x31415926);
+		bsPutUChar(s, 0x53);
+		bsPutUChar(s, 0x59);
+
+		/*-- Now the block's CRC, so it is in a known place. --*/
+		bsPutU32(s, s->blockCRC);
+
+		/*
+		 * Now a single bit indicating (non-)randomisation.
+		 * As of version 0.9.5, we use a better sorting algorithm
+		 * which makes randomisation unnecessary.  So always set
+		 * the randomised bit to 'no'.  Of course, the decoder
+		 * still needs to be able to handle randomised blocks
+		 * so as to maintain backwards compatibility with
+		 * older versions of bzip2.
+		 */
+		bsW(s, 1, 0);
+
+		bsW(s, 24, s->origPtr);
+		generateMTFValues(s);
+		sendMTFValues(s);
+	}
+
+	/*-- If this is the last block, add the stream trailer. --*/
+	if (is_last_block) {
+		/*bsPutUChar(s, 0x17);*/
+		/*bsPutUChar(s, 0x72);*/
+		/*bsPutUChar(s, 0x45);*/
+		/*bsPutUChar(s, 0x38);*/
+		bsPutU32(s, 0x17724538);
+		bsPutUChar(s, 0x50);
+		bsPutUChar(s, 0x90);
+		bsPutU32(s, s->combinedCRC);
+		bsFinishWrite(s);
+	}
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                        compress.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/archival/bz/crctable.c b/archival/bz/crctable.c
new file mode 100644
index 000000000..dadd372d3
--- /dev/null
+++ b/archival/bz/crctable.c
@@ -0,0 +1,105 @@
+/*
+ * bzip2 is written by Julian Seward <jseward@bzip.org>.
+ * Adapted for busybox by Denys Vlasenko <vda.linux@googlemail.com>.
+ * See README and LICENSE files in this directory for more information.
+ */
+
+/*-------------------------------------------------------------*/
+/*--- Table for doing CRCs                                  ---*/
+/*---                                            crctable.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+This file is part of bzip2/libbzip2, a program and library for
+lossless, block-sorting data compression.
+
+bzip2/libbzip2 version 1.0.4 of 20 December 2006
+Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
+
+Please read the WARNING, DISCLAIMER and PATENTS sections in the
+README file.
+
+This program is released under the terms of the license contained
+in the file LICENSE.
+------------------------------------------------------------------ */
+
+/* #include "bzlib_private.h" */
+
+/*
+ * I think this is an implementation of the AUTODIN-II,
+ * Ethernet & FDDI 32-bit CRC standard.  Vaguely derived
+ * from code by Rob Warnock, in Section 51 of the
+ * comp.compression FAQ.
+ */
+
+static const uint32_t BZ2_crc32Table[256] = {
+	0x00000000L, 0x04c11db7L, 0x09823b6eL, 0x0d4326d9L,
+	0x130476dcL, 0x17c56b6bL, 0x1a864db2L, 0x1e475005L,
+	0x2608edb8L, 0x22c9f00fL, 0x2f8ad6d6L, 0x2b4bcb61L,
+	0x350c9b64L, 0x31cd86d3L, 0x3c8ea00aL, 0x384fbdbdL,
+	0x4c11db70L, 0x48d0c6c7L, 0x4593e01eL, 0x4152fda9L,
+	0x5f15adacL, 0x5bd4b01bL, 0x569796c2L, 0x52568b75L,
+	0x6a1936c8L, 0x6ed82b7fL, 0x639b0da6L, 0x675a1011L,
+	0x791d4014L, 0x7ddc5da3L, 0x709f7b7aL, 0x745e66cdL,
+	0x9823b6e0L, 0x9ce2ab57L, 0x91a18d8eL, 0x95609039L,
+	0x8b27c03cL, 0x8fe6dd8bL, 0x82a5fb52L, 0x8664e6e5L,
+	0xbe2b5b58L, 0xbaea46efL, 0xb7a96036L, 0xb3687d81L,
+	0xad2f2d84L, 0xa9ee3033L, 0xa4ad16eaL, 0xa06c0b5dL,
+	0xd4326d90L, 0xd0f37027L, 0xddb056feL, 0xd9714b49L,
+	0xc7361b4cL, 0xc3f706fbL, 0xceb42022L, 0xca753d95L,
+	0xf23a8028L, 0xf6fb9d9fL, 0xfbb8bb46L, 0xff79a6f1L,
+	0xe13ef6f4L, 0xe5ffeb43L, 0xe8bccd9aL, 0xec7dd02dL,
+	0x34867077L, 0x30476dc0L, 0x3d044b19L, 0x39c556aeL,
+	0x278206abL, 0x23431b1cL, 0x2e003dc5L, 0x2ac12072L,
+	0x128e9dcfL, 0x164f8078L, 0x1b0ca6a1L, 0x1fcdbb16L,
+	0x018aeb13L, 0x054bf6a4L, 0x0808d07dL, 0x0cc9cdcaL,
+	0x7897ab07L, 0x7c56b6b0L, 0x71159069L, 0x75d48ddeL,
+	0x6b93dddbL, 0x6f52c06cL, 0x6211e6b5L, 0x66d0fb02L,
+	0x5e9f46bfL, 0x5a5e5b08L, 0x571d7dd1L, 0x53dc6066L,
+	0x4d9b3063L, 0x495a2dd4L, 0x44190b0dL, 0x40d816baL,
+	0xaca5c697L, 0xa864db20L, 0xa527fdf9L, 0xa1e6e04eL,
+	0xbfa1b04bL, 0xbb60adfcL, 0xb6238b25L, 0xb2e29692L,
+	0x8aad2b2fL, 0x8e6c3698L, 0x832f1041L, 0x87ee0df6L,
+	0x99a95df3L, 0x9d684044L, 0x902b669dL, 0x94ea7b2aL,
+	0xe0b41de7L, 0xe4750050L, 0xe9362689L, 0xedf73b3eL,
+	0xf3b06b3bL, 0xf771768cL, 0xfa325055L, 0xfef34de2L,
+	0xc6bcf05fL, 0xc27dede8L, 0xcf3ecb31L, 0xcbffd686L,
+	0xd5b88683L, 0xd1799b34L, 0xdc3abdedL, 0xd8fba05aL,
+	0x690ce0eeL, 0x6dcdfd59L, 0x608edb80L, 0x644fc637L,
+	0x7a089632L, 0x7ec98b85L, 0x738aad5cL, 0x774bb0ebL,
+	0x4f040d56L, 0x4bc510e1L, 0x46863638L, 0x42472b8fL,
+	0x5c007b8aL, 0x58c1663dL, 0x558240e4L, 0x51435d53L,
+	0x251d3b9eL, 0x21dc2629L, 0x2c9f00f0L, 0x285e1d47L,
+	0x36194d42L, 0x32d850f5L, 0x3f9b762cL, 0x3b5a6b9bL,
+	0x0315d626L, 0x07d4cb91L, 0x0a97ed48L, 0x0e56f0ffL,
+	0x1011a0faL, 0x14d0bd4dL, 0x19939b94L, 0x1d528623L,
+	0xf12f560eL, 0xf5ee4bb9L, 0xf8ad6d60L, 0xfc6c70d7L,
+	0xe22b20d2L, 0xe6ea3d65L, 0xeba91bbcL, 0xef68060bL,
+	0xd727bbb6L, 0xd3e6a601L, 0xdea580d8L, 0xda649d6fL,
+	0xc423cd6aL, 0xc0e2d0ddL, 0xcda1f604L, 0xc960ebb3L,
+	0xbd3e8d7eL, 0xb9ff90c9L, 0xb4bcb610L, 0xb07daba7L,
+	0xae3afba2L, 0xaafbe615L, 0xa7b8c0ccL, 0xa379dd7bL,
+	0x9b3660c6L, 0x9ff77d71L, 0x92b45ba8L, 0x9675461fL,
+	0x8832161aL, 0x8cf30badL, 0x81b02d74L, 0x857130c3L,
+	0x5d8a9099L, 0x594b8d2eL, 0x5408abf7L, 0x50c9b640L,
+	0x4e8ee645L, 0x4a4ffbf2L, 0x470cdd2bL, 0x43cdc09cL,
+	0x7b827d21L, 0x7f436096L, 0x7200464fL, 0x76c15bf8L,
+	0x68860bfdL, 0x6c47164aL, 0x61043093L, 0x65c52d24L,
+	0x119b4be9L, 0x155a565eL, 0x18197087L, 0x1cd86d30L,
+	0x029f3d35L, 0x065e2082L, 0x0b1d065bL, 0x0fdc1becL,
+	0x3793a651L, 0x3352bbe6L, 0x3e119d3fL, 0x3ad08088L,
+	0x2497d08dL, 0x2056cd3aL, 0x2d15ebe3L, 0x29d4f654L,
+	0xc5a92679L, 0xc1683bceL, 0xcc2b1d17L, 0xc8ea00a0L,
+	0xd6ad50a5L, 0xd26c4d12L, 0xdf2f6bcbL, 0xdbee767cL,
+	0xe3a1cbc1L, 0xe760d676L, 0xea23f0afL, 0xeee2ed18L,
+	0xf0a5bd1dL, 0xf464a0aaL, 0xf9278673L, 0xfde69bc4L,
+	0x89b8fd09L, 0x8d79e0beL, 0x803ac667L, 0x84fbdbd0L,
+	0x9abc8bd5L, 0x9e7d9662L, 0x933eb0bbL, 0x97ffad0cL,
+	0xafb010b1L, 0xab710d06L, 0xa6322bdfL, 0xa2f33668L,
+	0xbcb4666dL, 0xb8757bdaL, 0xb5365d03L, 0xb1f740b4L
+};
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                        crctable.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/archival/bz/huffman.c b/archival/bz/huffman.c
new file mode 100644
index 000000000..d01af11c2
--- /dev/null
+++ b/archival/bz/huffman.c
@@ -0,0 +1,188 @@
+/*
+ * bzip2 is written by Julian Seward <jseward@bzip.org>.
+ * Adapted for busybox by Denys Vlasenko <vda.linux@googlemail.com>.
+ * See README and LICENSE files in this directory for more information.
+ */
+
+/*-------------------------------------------------------------*/
+/*--- Huffman coding low-level stuff                        ---*/
+/*---                                             huffman.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+This file is part of bzip2/libbzip2, a program and library for
+lossless, block-sorting data compression.
+
+bzip2/libbzip2 version 1.0.4 of 20 December 2006
+Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
+
+Please read the WARNING, DISCLAIMER and PATENTS sections in the
+README file.
+
+This program is released under the terms of the license contained
+in the file LICENSE.
+------------------------------------------------------------------ */
+
+/* #include "bzlib_private.h" */
+
+/*---------------------------------------------------*/
+#define WEIGHTOF(zz0)  ((zz0) & 0xffffff00)
+#define DEPTHOF(zz1)   ((zz1) & 0x000000ff)
+#define MYMAX(zz2,zz3) ((zz2) > (zz3) ? (zz2) : (zz3))
+
+#define ADDWEIGHTS(zw1,zw2) \
+	(WEIGHTOF(zw1)+WEIGHTOF(zw2)) | \
+	(1 + MYMAX(DEPTHOF(zw1),DEPTHOF(zw2)))
+
+#define UPHEAP(z) \
+{ \
+	int32_t zz, tmp; \
+	zz = z; \
+	tmp = heap[zz]; \
+	while (weight[tmp] < weight[heap[zz >> 1]]) { \
+		heap[zz] = heap[zz >> 1]; \
+		zz >>= 1; \
+	} \
+	heap[zz] = tmp; \
+}
+
+#define DOWNHEAP(z) \
+{ \
+	int32_t zz, yy, tmp; \
+	zz = z; tmp = heap[zz]; \
+	while (1) { \
+		yy = zz << 1; \
+		if (yy > nHeap) \
+			break; \
+		if (yy < nHeap \
+		 && weight[heap[yy+1]] < weight[heap[yy]]) \
+			yy++; \
+		if (weight[tmp] < weight[heap[yy]]) \
+			break; \
+		heap[zz] = heap[yy]; \
+		zz = yy; \
+	} \
+	heap[zz] = tmp; \
+}
+
+
+/*---------------------------------------------------*/
+static
+void BZ2_hbMakeCodeLengths(UChar *len,
+		int32_t *freq,
+		int32_t alphaSize,
+		int32_t maxLen)
+{
+	/*
+	 * Nodes and heap entries run from 1.  Entry 0
+	 * for both the heap and nodes is a sentinel.
+	 */
+	int32_t nNodes, nHeap, n1, n2, i, j, k;
+	Bool  tooLong;
+
+	int32_t heap  [BZ_MAX_ALPHA_SIZE + 2];
+	int32_t weight[BZ_MAX_ALPHA_SIZE * 2];
+	int32_t parent[BZ_MAX_ALPHA_SIZE * 2];
+
+	for (i = 0; i < alphaSize; i++)
+		weight[i+1] = (freq[i] == 0 ? 1 : freq[i]) << 8;
+
+	while (1) {
+		nNodes = alphaSize;
+		nHeap = 0;
+
+		heap[0] = 0;
+		weight[0] = 0;
+		parent[0] = -2;
+
+		for (i = 1; i <= alphaSize; i++) {
+			parent[i] = -1;
+			nHeap++;
+			heap[nHeap] = i;
+			UPHEAP(nHeap);
+		}
+
+		AssertH(nHeap < (BZ_MAX_ALPHA_SIZE+2), 2001);
+	
+		while (nHeap > 1) {
+			n1 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1);
+			n2 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1);
+			nNodes++;
+			parent[n1] = parent[n2] = nNodes;
+			weight[nNodes] = ADDWEIGHTS(weight[n1], weight[n2]);
+			parent[nNodes] = -1;
+			nHeap++;
+			heap[nHeap] = nNodes;
+			UPHEAP(nHeap);
+		}
+
+		AssertH(nNodes < (BZ_MAX_ALPHA_SIZE * 2), 2002);
+
+		tooLong = False;
+		for (i = 1; i <= alphaSize; i++) {
+			j = 0;
+			k = i;
+			while (parent[k] >= 0) {
+				k = parent[k];
+				j++;
+			}
+			len[i-1] = j;
+			if (j > maxLen)
+				tooLong = True;
+		}
+		
+		if (!tooLong)
+			break;
+
+		/* 17 Oct 04: keep-going condition for the following loop used
+		to be 'i < alphaSize', which missed the last element,
+		theoretically leading to the possibility of the compressor
+		looping.  However, this count-scaling step is only needed if
+		one of the generated Huffman code words is longer than
+		maxLen, which up to and including version 1.0.2 was 20 bits,
+		which is extremely unlikely.  In version 1.0.3 maxLen was
+		changed to 17 bits, which has minimal effect on compression
+		ratio, but does mean this scaling step is used from time to
+		time, enough to verify that it works.
+
+		This means that bzip2-1.0.3 and later will only produce
+		Huffman codes with a maximum length of 17 bits.  However, in
+		order to preserve backwards compatibility with bitstreams
+		produced by versions pre-1.0.3, the decompressor must still
+		handle lengths of up to 20. */
+
+		for (i = 1; i <= alphaSize; i++) {
+			j = weight[i] >> 8;
+			j = 1 + (j / 2);
+			weight[i] = j << 8;
+		}
+	}
+}
+
+
+/*---------------------------------------------------*/
+static
+void BZ2_hbAssignCodes(int32_t *code,
+		UChar *length,
+		int32_t minLen,
+		int32_t maxLen,
+		int32_t alphaSize)
+{
+	int32_t n, vec, i;
+
+	vec = 0;
+	for (n = minLen; n <= maxLen; n++) {
+		for (i = 0; i < alphaSize; i++) {
+			if (length[i] == n) {
+				code[i] = vec;
+				vec++;
+			};
+		}
+		vec <<= 1;
+	}
+}
+
+
+/*-------------------------------------------------------------*/
+/*--- end                                         huffman.c ---*/
+/*-------------------------------------------------------------*/
diff --git a/archival/bz/randtable.c b/archival/bz/randtable.c
new file mode 100644
index 000000000..8a3c562da
--- /dev/null
+++ b/archival/bz/randtable.c
@@ -0,0 +1,85 @@
+/*
+ * bzip2 is written by Julian Seward <jseward@bzip.org>.
+ * Adapted for busybox by Denys Vlasenko <vda.linux@googlemail.com>.
+ * See README and LICENSE files in this directory for more information.
+ */
+
+/*-------------------------------------------------------------*/
+/*--- Table for randomising repetitive blocks               ---*/
+/*---                                           randtable.c ---*/
+/*-------------------------------------------------------------*/
+
+/* ------------------------------------------------------------------
+This file is part of bzip2/libbzip2, a program and library for
+lossless, block-sorting data compression.
+
+bzip2/libbzip2 version 1.0.4 of 20 December 2006
+Copyright (C) 1996-2006 Julian Seward <jseward@bzip.org>
+
+Please read the WARNING, DISCLAIMER and PATENTS sections in the
+README file.
+
+This program is released under the terms of the license contained
+in the file LICENSE.
+------------------------------------------------------------------ */
+
+/* #include "bzlib_private.h" */
+
+static const int32_t BZ2_rNums[512] = {
+	619, 720, 127, 481, 931, 816, 813, 233, 566, 247,
+	985, 724, 205, 454, 863, 491, 741, 242, 949, 214,
+	733, 859, 335, 708, 621, 574, 73, 654, 730, 472,
+	419, 436, 278, 496, 867, 210, 399, 680, 480, 51,
+	878, 465, 811, 169, 869, 675, 611, 697, 867, 561,
+	862, 687, 507, 283, 482, 129, 807, 591, 733, 623,
+	150, 238, 59, 379, 684, 877, 625, 169, 643, 105,
+	170, 607, 520, 932, 727, 476, 693, 425, 174, 647,
+	73, 122, 335, 530, 442, 853, 695, 249, 445, 515,
+	909, 545, 703, 919, 874, 474, 882, 500, 594, 612,
+	641, 801, 220, 162, 819, 984, 589, 513, 495, 799,
+	161, 604, 958, 533, 221, 400, 386, 867, 600, 782,
+	382, 596, 414, 171, 516, 375, 682, 485, 911, 276,
+	98, 553, 163, 354, 666, 933, 424, 341, 533, 870,
+	227, 730, 475, 186, 263, 647, 537, 686, 600, 224,
+	469, 68, 770, 919, 190, 373, 294, 822, 808, 206,
+	184, 943, 795, 384, 383, 461, 404, 758, 839, 887,
+	715, 67, 618, 276, 204, 918, 873, 777, 604, 560,
+	951, 160, 578, 722, 79, 804, 96, 409, 713, 940,
+	652, 934, 970, 447, 318, 353, 859, 672, 112, 785,
+	645, 863, 803, 350, 139, 93, 354, 99, 820, 908,
+	609, 772, 154, 274, 580, 184, 79, 626, 630, 742,
+	653, 282, 762, 623, 680, 81, 927, 626, 789, 125,
+	411, 521, 938, 300, 821, 78, 343, 175, 128, 250,
+	170, 774, 972, 275, 999, 639, 495, 78, 352, 126,
+	857, 956, 358, 619, 580, 124, 737, 594, 701, 612,
+	669, 112, 134, 694, 363, 992, 809, 743, 168, 974,
+	944, 375, 748, 52, 600, 747, 642, 182, 862, 81,
+	344, 805, 988, 739, 511, 655, 814, 334, 249, 515,
+	897, 955, 664, 981, 649, 113, 974, 459, 893, 228,
+	433, 837, 553, 268, 926, 240, 102, 654, 459, 51,
+	686, 754, 806, 760, 493, 403, 415, 394, 687, 700,
+	946, 670, 656, 610, 738, 392, 760, 799, 887, 653,
+	978, 321, 576, 617, 626, 502, 894, 679, 243, 440,
+	680, 879, 194, 572, 640, 724, 926, 56, 204, 700,
+	707, 151, 457, 449, 797, 195, 791, 558, 945, 679,
+	297, 59, 87, 824, 713, 663, 412, 693, 342, 606,
+	134, 108, 571, 364, 631, 212, 174, 643, 304, 329,
+	343, 97, 430, 751, 497, 314, 983, 374, 822, 928,
+	140, 206, 73, 263, 980, 736, 876, 478, 430, 305,
+	170, 514, 364, 692, 829, 82, 855, 953, 676, 246,
+	369, 970, 294, 750, 807, 827, 150, 790, 288, 923,
+	804, 378, 215, 828, 592, 281, 565, 555, 710, 82,
+	896, 831, 547, 261, 524, 462, 293, 465, 502, 56,
+	661, 821, 976, 991, 658, 869, 905, 758, 745, 193,
+	768, 550, 608, 933, 378, 286, 215, 979, 792, 961,
+	61, 688, 793, 644, 986, 403, 106, 366, 905, 644,
+	372, 567, 466, 434, 645, 210, 389, 550, 919, 135,
+	780, 773, 635, 389, 707, 100, 626, 958, 165, 504,
+	920, 176, 193, 713, 857, 265, 203, 50, 668, 108,
+	645, 990, 626, 197, 510, 357, 358, 850, 858, 364,
+	936, 638
+};
+
+/*-------------------------------------------------------------*/
+/*--- end                                       randtable.c ---*/
+/*-------------------------------------------------------------*/