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diff --git a/archival/bz/bzlib_private.h b/archival/bz/bzlib_private.h
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+/*
+ * 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 ---*/
+/*-------------------------------------------------------------*/