Message-Id: <20181109190304.8573-14-kilobyte@angband.pl>
Date:   Fri,  9 Nov 2018 20:03:01 +0100
From:   Adam Borowski <kilobyte@...band.pl>
To:     linux-kernel@...r.kernel.org, Nick Terrell <terrelln@...com>,
        Russell King <linux@...linux.org.uk>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k@...ts.linux-m68k.org,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>, linux-mips@...ux-mips.org,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Stafford Horne <shorne@...il.com>,
        openrisc@...ts.librecores.org,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>, linux-parisc@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-s390@...r.kernel.org,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        linux-xtensa@...ux-xtensa.org
Cc:     Adam Borowski <kilobyte@...band.pl>
Subject: [PATCH 14/17] lib: Completely purge now-unused bzip2 code from the kernel

All remaining references are userspace code to build tarballs, packages
or such.

Signed-off-by: Adam Borowski <kilobyte@...band.pl>
---
 lib/Kconfig              |   3 -
 lib/Makefile             |   1 -
 lib/decompress.c         |   4 -
 lib/decompress_bunzip2.c | 756 ---------------------------------------
 scripts/Makefile.lib     |  12 +-
 5 files changed, 2 insertions(+), 774 deletions(-)
 delete mode 100644 lib/decompress_bunzip2.c

diff --git a/lib/Kconfig b/lib/Kconfig
index e7ab43fd5461..83a548b8c504 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -286,9 +286,6 @@ config DECOMPRESS_GZIP
 	select ZLIB_INFLATE
 	tristate
 
-config DECOMPRESS_BZIP2
-	tristate
-
 config DECOMPRESS_LZMA
 	tristate
 
diff --git a/lib/Makefile b/lib/Makefile
index 58b48993f48a..4c1905e6d3a7 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -134,7 +134,6 @@ obj-$(CONFIG_XZ_DEC) += xz/
 obj-$(CONFIG_RAID6_PQ) += raid6/
 
 lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
-lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
 lib-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
 lib-$(CONFIG_DECOMPRESS_XZ) += decompress_unxz.o
 lib-$(CONFIG_DECOMPRESS_LZO) += decompress_unlzo.o
diff --git a/lib/decompress.c b/lib/decompress.c
index ab3fc90ffc64..60f05122b9da 100644
--- a/lib/decompress.c
+++ b/lib/decompress.c
@@ -23,9 +23,6 @@
 #ifndef CONFIG_DECOMPRESS_GZIP
 # define gunzip NULL
 #endif
-#ifndef CONFIG_DECOMPRESS_BZIP2
-# define bunzip2 NULL
-#endif
 #ifndef CONFIG_DECOMPRESS_LZMA
 # define unlzma NULL
 #endif
@@ -51,7 +48,6 @@ struct compress_format {
 static const struct compress_format compressed_formats[] __initconst = {
 	{ {0x1f, 0x8b}, "gzip", gunzip },
 	{ {0x1f, 0x9e}, "gzip", gunzip },
-	{ {0x42, 0x5a}, "bzip2", bunzip2 },
 	{ {0x5d, 0x00}, "lzma", unlzma },
 	{ {0xfd, 0x37}, "xz", unxz },
 	{ {0x89, 0x4c}, "lzo", unlzo },
diff --git a/lib/decompress_bunzip2.c b/lib/decompress_bunzip2.c
deleted file mode 100644
index 7c4932eed748..000000000000
--- a/lib/decompress_bunzip2.c
+++ /dev/null
@@ -1,756 +0,0 @@
-/*	Small bzip2 deflate implementation, by Rob Landley (rob@...dley.net).
-
-	Based on bzip2 decompression code by Julian R Seward (jseward@....org),
-	which also acknowledges contributions by Mike Burrows, David Wheeler,
-	Peter Fenwick, Alistair Moffat, Radford Neal, Ian H. Witten,
-	Robert Sedgewick, and Jon L. Bentley.
-
-	This code is licensed under the LGPLv2:
-		LGPL (http://www.gnu.org/copyleft/lgpl.html
-*/
-
-/*
-	Size and speed optimizations by Manuel Novoa III  (mjn3@...epoet.org).
-
-	More efficient reading of Huffman codes, a streamlined read_bunzip()
-	function, and various other tweaks.  In (limited) tests, approximately
-	20% faster than bzcat on x86 and about 10% faster on arm.
-
-	Note that about 2/3 of the time is spent in read_unzip() reversing
-	the Burrows-Wheeler transformation.  Much of that time is delay
-	resulting from cache misses.
-
-	I would ask that anyone benefiting from this work, especially those
-	using it in commercial products, consider making a donation to my local
-	non-profit hospice organization in the name of the woman I loved, who
-	passed away Feb. 12, 2003.
-
-		In memory of Toni W. Hagan
-
-		Hospice of Acadiana, Inc.
-		2600 Johnston St., Suite 200
-		Lafayette, LA 70503-3240
-
-		Phone (337) 232-1234 or 1-800-738-2226
-		Fax   (337) 232-1297
-
-		http://www.hospiceacadiana.com/
-
-	Manuel
- */
-
-/*
-	Made it fit for running in Linux Kernel by Alain Knaff (alain@...ff.lu)
-*/
-
-
-#ifdef STATIC
-#define PREBOOT
-#else
-#include <linux/decompress/bunzip2.h>
-#endif /* STATIC */
-
-#include <linux/decompress/mm.h>
-#include <linux/crc32poly.h>
-
-#ifndef INT_MAX
-#define INT_MAX 0x7fffffff
-#endif
-
-/* Constants for Huffman coding */
-#define MAX_GROUPS		6
-#define GROUP_SIZE   		50	/* 64 would have been more efficient */
-#define MAX_HUFCODE_BITS 	20	/* Longest Huffman code allowed */
-#define MAX_SYMBOLS 		258	/* 256 literals + RUNA + RUNB */
-#define SYMBOL_RUNA		0
-#define SYMBOL_RUNB		1
-
-/* Status return values */
-#define RETVAL_OK			0
-#define RETVAL_LAST_BLOCK		(-1)
-#define RETVAL_NOT_BZIP_DATA		(-2)
-#define RETVAL_UNEXPECTED_INPUT_EOF	(-3)
-#define RETVAL_UNEXPECTED_OUTPUT_EOF	(-4)
-#define RETVAL_DATA_ERROR		(-5)
-#define RETVAL_OUT_OF_MEMORY		(-6)
-#define RETVAL_OBSOLETE_INPUT		(-7)
-
-/* Other housekeeping constants */
-#define BZIP2_IOBUF_SIZE		4096
-
-/* This is what we know about each Huffman coding group */
-struct group_data {
-	/* We have an extra slot at the end of limit[] for a sentinal value. */
-	int limit[MAX_HUFCODE_BITS+1];
-	int base[MAX_HUFCODE_BITS];
-	int permute[MAX_SYMBOLS];
-	int minLen, maxLen;
-};
-
-/* Structure holding all the housekeeping data, including IO buffers and
-   memory that persists between calls to bunzip */
-struct bunzip_data {
-	/* State for interrupting output loop */
-	int writeCopies, writePos, writeRunCountdown, writeCount, writeCurrent;
-	/* I/O tracking data (file handles, buffers, positions, etc.) */
-	long (*fill)(void*, unsigned long);
-	long inbufCount, inbufPos /*, outbufPos*/;
-	unsigned char *inbuf /*,*outbuf*/;
-	unsigned int inbufBitCount, inbufBits;
-	/* The CRC values stored in the block header and calculated from the
-	data */
-	unsigned int crc32Table[256], headerCRC, totalCRC, writeCRC;
-	/* Intermediate buffer and its size (in bytes) */
-	unsigned int *dbuf, dbufSize;
-	/* These things are a bit too big to go on the stack */
-	unsigned char selectors[32768];		/* nSelectors = 15 bits */
-	struct group_data groups[MAX_GROUPS];	/* Huffman coding tables */
-	int io_error;			/* non-zero if we have IO error */
-	int byteCount[256];
-	unsigned char symToByte[256], mtfSymbol[256];
-};
-
-
-/* Return the next nnn bits of input.  All reads from the compressed input
-   are done through this function.  All reads are big endian */
-static unsigned int INIT get_bits(struct bunzip_data *bd, char bits_wanted)
-{
-	unsigned int bits = 0;
-
-	/* If we need to get more data from the byte buffer, do so.
-	   (Loop getting one byte at a time to enforce endianness and avoid
-	   unaligned access.) */
-	while (bd->inbufBitCount < bits_wanted) {
-		/* If we need to read more data from file into byte buffer, do
-		   so */
-		if (bd->inbufPos == bd->inbufCount) {
-			if (bd->io_error)
-				return 0;
-			bd->inbufCount = bd->fill(bd->inbuf, BZIP2_IOBUF_SIZE);
-			if (bd->inbufCount <= 0) {
-				bd->io_error = RETVAL_UNEXPECTED_INPUT_EOF;
-				return 0;
-			}
-			bd->inbufPos = 0;
-		}
-		/* Avoid 32-bit overflow (dump bit buffer to top of output) */
-		if (bd->inbufBitCount >= 24) {
-			bits = bd->inbufBits&((1 << bd->inbufBitCount)-1);
-			bits_wanted -= bd->inbufBitCount;
-			bits <<= bits_wanted;
-			bd->inbufBitCount = 0;
-		}
-		/* Grab next 8 bits of input from buffer. */
-		bd->inbufBits = (bd->inbufBits << 8)|bd->inbuf[bd->inbufPos++];
-		bd->inbufBitCount += 8;
-	}
-	/* Calculate result */
-	bd->inbufBitCount -= bits_wanted;
-	bits |= (bd->inbufBits >> bd->inbufBitCount)&((1 << bits_wanted)-1);
-
-	return bits;
-}
-
-/* Unpacks the next block and sets up for the inverse burrows-wheeler step. */
-
-static int INIT get_next_block(struct bunzip_data *bd)
-{
-	struct group_data *hufGroup = NULL;
-	int *base = NULL;
-	int *limit = NULL;
-	int dbufCount, nextSym, dbufSize, groupCount, selector,
-		i, j, k, t, runPos, symCount, symTotal, nSelectors, *byteCount;
-	unsigned char uc, *symToByte, *mtfSymbol, *selectors;
-	unsigned int *dbuf, origPtr;
-
-	dbuf = bd->dbuf;
-	dbufSize = bd->dbufSize;
-	selectors = bd->selectors;
-	byteCount = bd->byteCount;
-	symToByte = bd->symToByte;
-	mtfSymbol = bd->mtfSymbol;
-
-	/* Read in header signature and CRC, then validate signature.
-	   (last block signature means CRC is for whole file, return now) */
-	i = get_bits(bd, 24);
-	j = get_bits(bd, 24);
-	bd->headerCRC = get_bits(bd, 32);
-	if ((i == 0x177245) && (j == 0x385090))
-		return RETVAL_LAST_BLOCK;
-	if ((i != 0x314159) || (j != 0x265359))
-		return RETVAL_NOT_BZIP_DATA;
-	/* We can add support for blockRandomised if anybody complains.
-	   There was some code for this in busybox 1.0.0-pre3, but nobody ever
-	   noticed that it didn't actually work. */
-	if (get_bits(bd, 1))
-		return RETVAL_OBSOLETE_INPUT;
-	origPtr = get_bits(bd, 24);
-	if (origPtr >= dbufSize)
-		return RETVAL_DATA_ERROR;
-	/* mapping table: if some byte values are never used (encoding things
-	   like ascii text), the compression code removes the gaps to have fewer
-	   symbols to deal with, and writes a sparse bitfield indicating which
-	   values were present.  We make a translation table to convert the
-	   symbols back to the corresponding bytes. */
-	t = get_bits(bd, 16);
-	symTotal = 0;
-	for (i = 0; i < 16; i++) {
-		if (t&(1 << (15-i))) {
-			k = get_bits(bd, 16);
-			for (j = 0; j < 16; j++)
-				if (k&(1 << (15-j)))
-					symToByte[symTotal++] = (16*i)+j;
-		}
-	}
-	/* How many different Huffman coding groups does this block use? */
-	groupCount = get_bits(bd, 3);
-	if (groupCount < 2 || groupCount > MAX_GROUPS)
-		return RETVAL_DATA_ERROR;
-	/* nSelectors: Every GROUP_SIZE many symbols we select a new
-	   Huffman coding group.  Read in the group selector list,
-	   which is stored as MTF encoded bit runs.  (MTF = Move To
-	   Front, as each value is used it's moved to the start of the
-	   list.) */
-	nSelectors = get_bits(bd, 15);
-	if (!nSelectors)
-		return RETVAL_DATA_ERROR;
-	for (i = 0; i < groupCount; i++)
-		mtfSymbol[i] = i;
-	for (i = 0; i < nSelectors; i++) {
-		/* Get next value */
-		for (j = 0; get_bits(bd, 1); j++)
-			if (j >= groupCount)
-				return RETVAL_DATA_ERROR;
-		/* Decode MTF to get the next selector */
-		uc = mtfSymbol[j];
-		for (; j; j--)
-			mtfSymbol[j] = mtfSymbol[j-1];
-		mtfSymbol[0] = selectors[i] = uc;
-	}
-	/* Read the Huffman coding tables for each group, which code
-	   for symTotal literal symbols, plus two run symbols (RUNA,
-	   RUNB) */
-	symCount = symTotal+2;
-	for (j = 0; j < groupCount; j++) {
-		unsigned char length[MAX_SYMBOLS], temp[MAX_HUFCODE_BITS+1];
-		int	minLen,	maxLen, pp;
-		/* Read Huffman code lengths for each symbol.  They're
-		   stored in a way similar to mtf; record a starting
-		   value for the first symbol, and an offset from the
-		   previous value for everys symbol after that.
-		   (Subtracting 1 before the loop and then adding it
-		   back at the end is an optimization that makes the
-		   test inside the loop simpler: symbol length 0
-		   becomes negative, so an unsigned inequality catches
-		   it.) */
-		t = get_bits(bd, 5)-1;
-		for (i = 0; i < symCount; i++) {
-			for (;;) {
-				if (((unsigned)t) > (MAX_HUFCODE_BITS-1))
-					return RETVAL_DATA_ERROR;
-
-				/* If first bit is 0, stop.  Else
-				   second bit indicates whether to
-				   increment or decrement the value.
-				   Optimization: grab 2 bits and unget
-				   the second if the first was 0. */
-
-				k = get_bits(bd, 2);
-				if (k < 2) {
-					bd->inbufBitCount++;
-					break;
-				}
-				/* Add one if second bit 1, else
-				 * subtract 1.  Avoids if/else */
-				t += (((k+1)&2)-1);
-			}
-			/* Correct for the initial -1, to get the
-			 * final symbol length */
-			length[i] = t+1;
-		}
-		/* Find largest and smallest lengths in this group */
-		minLen = maxLen = length[0];
-
-		for (i = 1; i < symCount; i++) {
-			if (length[i] > maxLen)
-				maxLen = length[i];
-			else if (length[i] < minLen)
-				minLen = length[i];
-		}
-
-		/* Calculate permute[], base[], and limit[] tables from
-		 * length[].
-		 *
-		 * permute[] is the lookup table for converting
-		 * Huffman coded symbols into decoded symbols.  base[]
-		 * is the amount to subtract from the value of a
-		 * Huffman symbol of a given length when using
-		 * permute[].
-		 *
-		 * limit[] indicates the largest numerical value a
-		 * symbol with a given number of bits can have.  This
-		 * is how the Huffman codes can vary in length: each
-		 * code with a value > limit[length] needs another
-		 * bit.
-		 */
-		hufGroup = bd->groups+j;
-		hufGroup->minLen = minLen;
-		hufGroup->maxLen = maxLen;
-		/* Note that minLen can't be smaller than 1, so we
-		   adjust the base and limit array pointers so we're
-		   not always wasting the first entry.  We do this
-		   again when using them (during symbol decoding).*/
-		base = hufGroup->base-1;
-		limit = hufGroup->limit-1;
-		/* Calculate permute[].  Concurrently, initialize
-		 * temp[] and limit[]. */
-		pp = 0;
-		for (i = minLen; i <= maxLen; i++) {
-			temp[i] = limit[i] = 0;
-			for (t = 0; t < symCount; t++)
-				if (length[t] == i)
-					hufGroup->permute[pp++] = t;
-		}
-		/* Count symbols coded for at each bit length */
-		for (i = 0; i < symCount; i++)
-			temp[length[i]]++;
-		/* Calculate limit[] (the largest symbol-coding value
-		 *at each bit length, which is (previous limit <<
-		 *1)+symbols at this level), and base[] (number of
-		 *symbols to ignore at each bit length, which is limit
-		 *minus the cumulative count of symbols coded for
-		 *already). */
-		pp = t = 0;
-		for (i = minLen; i < maxLen; i++) {
-			pp += temp[i];
-			/* We read the largest possible symbol size
-			   and then unget bits after determining how
-			   many we need, and those extra bits could be
-			   set to anything.  (They're noise from
-			   future symbols.)  At each level we're
-			   really only interested in the first few
-			   bits, so here we set all the trailing
-			   to-be-ignored bits to 1 so they don't
-			   affect the value > limit[length]
-			   comparison. */
-			limit[i] = (pp << (maxLen - i)) - 1;
-			pp <<= 1;
-			base[i+1] = pp-(t += temp[i]);
-		}
-		limit[maxLen+1] = INT_MAX; /* Sentinal value for
-					    * reading next sym. */
-		limit[maxLen] = pp+temp[maxLen]-1;
-		base[minLen] = 0;
-	}
-	/* We've finished reading and digesting the block header.  Now
-	   read this block's Huffman coded symbols from the file and
-	   undo the Huffman coding and run length encoding, saving the
-	   result into dbuf[dbufCount++] = uc */
-
-	/* Initialize symbol occurrence counters and symbol Move To
-	 * Front table */
-	for (i = 0; i < 256; i++) {
-		byteCount[i] = 0;
-		mtfSymbol[i] = (unsigned char)i;
-	}
-	/* Loop through compressed symbols. */
-	runPos = dbufCount = symCount = selector = 0;
-	for (;;) {
-		/* Determine which Huffman coding group to use. */
-		if (!(symCount--)) {
-			symCount = GROUP_SIZE-1;
-			if (selector >= nSelectors)
-				return RETVAL_DATA_ERROR;
-			hufGroup = bd->groups+selectors[selector++];
-			base = hufGroup->base-1;
-			limit = hufGroup->limit-1;
-		}
-		/* Read next Huffman-coded symbol. */
-		/* Note: It is far cheaper to read maxLen bits and
-		   back up than it is to read minLen bits and then an
-		   additional bit at a time, testing as we go.
-		   Because there is a trailing last block (with file
-		   CRC), there is no danger of the overread causing an
-		   unexpected EOF for a valid compressed file.  As a
-		   further optimization, we do the read inline
-		   (falling back to a call to get_bits if the buffer
-		   runs dry).  The following (up to got_huff_bits:) is
-		   equivalent to j = get_bits(bd, hufGroup->maxLen);
-		 */
-		while (bd->inbufBitCount < hufGroup->maxLen) {
-			if (bd->inbufPos == bd->inbufCount) {
-				j = get_bits(bd, hufGroup->maxLen);
-				goto got_huff_bits;
-			}
-			bd->inbufBits =
-				(bd->inbufBits << 8)|bd->inbuf[bd->inbufPos++];
-			bd->inbufBitCount += 8;
-		};
-		bd->inbufBitCount -= hufGroup->maxLen;
-		j = (bd->inbufBits >> bd->inbufBitCount)&
-			((1 << hufGroup->maxLen)-1);
-got_huff_bits:
-		/* Figure how how many bits are in next symbol and
-		 * unget extras */
-		i = hufGroup->minLen;
-		while (j > limit[i])
-			++i;
-		bd->inbufBitCount += (hufGroup->maxLen - i);
-		/* Huffman decode value to get nextSym (with bounds checking) */
-		if ((i > hufGroup->maxLen)
-			|| (((unsigned)(j = (j>>(hufGroup->maxLen-i))-base[i]))
-				>= MAX_SYMBOLS))
-			return RETVAL_DATA_ERROR;
-		nextSym = hufGroup->permute[j];
-		/* We have now decoded the symbol, which indicates
-		   either a new literal byte, or a repeated run of the
-		   most recent literal byte.  First, check if nextSym
-		   indicates a repeated run, and if so loop collecting
-		   how many times to repeat the last literal. */
-		if (((unsigned)nextSym) <= SYMBOL_RUNB) { /* RUNA or RUNB */
-			/* If this is the start of a new run, zero out
-			 * counter */
-			if (!runPos) {
-				runPos = 1;
-				t = 0;
-			}
-			/* Neat trick that saves 1 symbol: instead of
-			   or-ing 0 or 1 at each bit position, add 1
-			   or 2 instead.  For example, 1011 is 1 << 0
-			   + 1 << 1 + 2 << 2.  1010 is 2 << 0 + 2 << 1
-			   + 1 << 2.  You can make any bit pattern
-			   that way using 1 less symbol than the basic
-			   or 0/1 method (except all bits 0, which
-			   would use no symbols, but a run of length 0
-			   doesn't mean anything in this context).
-			   Thus space is saved. */
-			t += (runPos << nextSym);
-			/* +runPos if RUNA; +2*runPos if RUNB */
-
-			runPos <<= 1;
-			continue;
-		}
-		/* When we hit the first non-run symbol after a run,
-		   we now know how many times to repeat the last
-		   literal, so append that many copies to our buffer
-		   of decoded symbols (dbuf) now.  (The last literal
-		   used is the one at the head of the mtfSymbol
-		   array.) */
-		if (runPos) {
-			runPos = 0;
-			if (dbufCount+t >= dbufSize)
-				return RETVAL_DATA_ERROR;
-
-			uc = symToByte[mtfSymbol[0]];
-			byteCount[uc] += t;
-			while (t--)
-				dbuf[dbufCount++] = uc;
-		}
-		/* Is this the terminating symbol? */
-		if (nextSym > symTotal)
-			break;
-		/* At this point, nextSym indicates a new literal
-		   character.  Subtract one to get the position in the
-		   MTF array at which this literal is currently to be
-		   found.  (Note that the result can't be -1 or 0,
-		   because 0 and 1 are RUNA and RUNB.  But another
-		   instance of the first symbol in the mtf array,
-		   position 0, would have been handled as part of a
-		   run above.  Therefore 1 unused mtf position minus 2
-		   non-literal nextSym values equals -1.) */
-		if (dbufCount >= dbufSize)
-			return RETVAL_DATA_ERROR;
-		i = nextSym - 1;
-		uc = mtfSymbol[i];
-		/* Adjust the MTF array.  Since we typically expect to
-		 *move only a small number of symbols, and are bound
-		 *by 256 in any case, using memmove here would
-		 *typically be bigger and slower due to function call
-		 *overhead and other assorted setup costs. */
-		do {
-			mtfSymbol[i] = mtfSymbol[i-1];
-		} while (--i);
-		mtfSymbol[0] = uc;
-		uc = symToByte[uc];
-		/* We have our literal byte.  Save it into dbuf. */
-		byteCount[uc]++;
-		dbuf[dbufCount++] = (unsigned int)uc;
-	}
-	/* At this point, we've read all the Huffman-coded symbols
-	   (and repeated runs) for this block from the input stream,
-	   and decoded them into the intermediate buffer.  There are
-	   dbufCount many decoded bytes in dbuf[].  Now undo the
-	   Burrows-Wheeler transform on dbuf.  See
-	   http://dogma.net/markn/articles/bwt/bwt.htm
-	 */
-	/* Turn byteCount into cumulative occurrence counts of 0 to n-1. */
-	j = 0;
-	for (i = 0; i < 256; i++) {
-		k = j+byteCount[i];
-		byteCount[i] = j;
-		j = k;
-	}
-	/* Figure out what order dbuf would be in if we sorted it. */
-	for (i = 0; i < dbufCount; i++) {
-		uc = (unsigned char)(dbuf[i] & 0xff);
-		dbuf[byteCount[uc]] |= (i << 8);
-		byteCount[uc]++;
-	}
-	/* Decode first byte by hand to initialize "previous" byte.
-	   Note that it doesn't get output, and if the first three
-	   characters are identical it doesn't qualify as a run (hence
-	   writeRunCountdown = 5). */
-	if (dbufCount) {
-		if (origPtr >= dbufCount)
-			return RETVAL_DATA_ERROR;
-		bd->writePos = dbuf[origPtr];
-		bd->writeCurrent = (unsigned char)(bd->writePos&0xff);
-		bd->writePos >>= 8;
-		bd->writeRunCountdown = 5;
-	}
-	bd->writeCount = dbufCount;
-
-	return RETVAL_OK;
-}
-
-/* Undo burrows-wheeler transform on intermediate buffer to produce output.
-   If start_bunzip was initialized with out_fd =-1, then up to len bytes of
-   data are written to outbuf.  Return value is number of bytes written or
-   error (all errors are negative numbers).  If out_fd!=-1, outbuf and len
-   are ignored, data is written to out_fd and return is RETVAL_OK or error.
-*/
-
-static int INIT read_bunzip(struct bunzip_data *bd, char *outbuf, int len)
-{
-	const unsigned int *dbuf;
-	int pos, xcurrent, previous, gotcount;
-
-	/* If last read was short due to end of file, return last block now */
-	if (bd->writeCount < 0)
-		return bd->writeCount;
-
-	gotcount = 0;
-	dbuf = bd->dbuf;
-	pos = bd->writePos;
-	xcurrent = bd->writeCurrent;
-
-	/* We will always have pending decoded data to write into the output
-	   buffer unless this is the very first call (in which case we haven't
-	   Huffman-decoded a block into the intermediate buffer yet). */
-
-	if (bd->writeCopies) {
-		/* Inside the loop, writeCopies means extra copies (beyond 1) */
-		--bd->writeCopies;
-		/* Loop outputting bytes */
-		for (;;) {
-			/* If the output buffer is full, snapshot
-			 * state and return */
-			if (gotcount >= len) {
-				bd->writePos = pos;
-				bd->writeCurrent = xcurrent;
-				bd->writeCopies++;
-				return len;
-			}
-			/* Write next byte into output buffer, updating CRC */
-			outbuf[gotcount++] = xcurrent;
-			bd->writeCRC = (((bd->writeCRC) << 8)
-				^bd->crc32Table[((bd->writeCRC) >> 24)
-				^xcurrent]);
-			/* Loop now if we're outputting multiple
-			 * copies of this byte */
-			if (bd->writeCopies) {
-				--bd->writeCopies;
-				continue;
-			}
-decode_next_byte:
-			if (!bd->writeCount--)
-				break;
-			/* Follow sequence vector to undo
-			 * Burrows-Wheeler transform */
-			previous = xcurrent;
-			pos = dbuf[pos];
-			xcurrent = pos&0xff;
-			pos >>= 8;
-			/* After 3 consecutive copies of the same
-			   byte, the 4th is a repeat count.  We count
-			   down from 4 instead *of counting up because
-			   testing for non-zero is faster */
-			if (--bd->writeRunCountdown) {
-				if (xcurrent != previous)
-					bd->writeRunCountdown = 4;
-			} else {
-				/* We have a repeated run, this byte
-				 * indicates the count */
-				bd->writeCopies = xcurrent;
-				xcurrent = previous;
-				bd->writeRunCountdown = 5;
-				/* Sometimes there are just 3 bytes
-				 * (run length 0) */
-				if (!bd->writeCopies)
-					goto decode_next_byte;
-				/* Subtract the 1 copy we'd output
-				 * anyway to get extras */
-				--bd->writeCopies;
-			}
-		}
-		/* Decompression of this block completed successfully */
-		bd->writeCRC = ~bd->writeCRC;
-		bd->totalCRC = ((bd->totalCRC << 1) |
-				(bd->totalCRC >> 31)) ^ bd->writeCRC;
-		/* If this block had a CRC error, force file level CRC error. */
-		if (bd->writeCRC != bd->headerCRC) {
-			bd->totalCRC = bd->headerCRC+1;
-			return RETVAL_LAST_BLOCK;
-		}
-	}
-
-	/* Refill the intermediate buffer by Huffman-decoding next
-	 * block of input */
-	/* (previous is just a convenient unused temp variable here) */
-	previous = get_next_block(bd);
-	if (previous) {
-		bd->writeCount = previous;
-		return (previous != RETVAL_LAST_BLOCK) ? previous : gotcount;
-	}
-	bd->writeCRC = 0xffffffffUL;
-	pos = bd->writePos;
-	xcurrent = bd->writeCurrent;
-	goto decode_next_byte;
-}
-
-static long INIT nofill(void *buf, unsigned long len)
-{
-	return -1;
-}
-
-/* Allocate the structure, read file header.  If in_fd ==-1, inbuf must contain
-   a complete bunzip file (len bytes long).  If in_fd!=-1, inbuf and len are
-   ignored, and data is read from file handle into temporary buffer. */
-static int INIT start_bunzip(struct bunzip_data **bdp, void *inbuf, long len,
-			     long (*fill)(void*, unsigned long))
-{
-	struct bunzip_data *bd;
-	unsigned int i, j, c;
-	const unsigned int BZh0 =
-		(((unsigned int)'B') << 24)+(((unsigned int)'Z') << 16)
-		+(((unsigned int)'h') << 8)+(unsigned int)'0';
-
-	/* Figure out how much data to allocate */
-	i = sizeof(struct bunzip_data);
-
-	/* Allocate bunzip_data.  Most fields initialize to zero. */
-	bd = *bdp = malloc(i);
-	if (!bd)
-		return RETVAL_OUT_OF_MEMORY;
-	memset(bd, 0, sizeof(struct bunzip_data));
-	/* Setup input buffer */
-	bd->inbuf = inbuf;
-	bd->inbufCount = len;
-	if (fill != NULL)
-		bd->fill = fill;
-	else
-		bd->fill = nofill;
-
-	/* Init the CRC32 table (big endian) */
-	for (i = 0; i < 256; i++) {
-		c = i << 24;
-		for (j = 8; j; j--)
-			c = c&0x80000000 ? (c << 1)^(CRC32_POLY_BE) : (c << 1);
-		bd->crc32Table[i] = c;
-	}
-
-	/* Ensure that file starts with "BZh['1'-'9']." */
-	i = get_bits(bd, 32);
-	if (((unsigned int)(i-BZh0-1)) >= 9)
-		return RETVAL_NOT_BZIP_DATA;
-
-	/* Fourth byte (ascii '1'-'9'), indicates block size in units of 100k of
-	   uncompressed data.  Allocate intermediate buffer for block. */
-	bd->dbufSize = 100000*(i-BZh0);
-
-	bd->dbuf = large_malloc(bd->dbufSize * sizeof(int));
-	if (!bd->dbuf)
-		return RETVAL_OUT_OF_MEMORY;
-	return RETVAL_OK;
-}
-
-/* Example usage: decompress src_fd to dst_fd.  (Stops at end of bzip2 data,
-   not end of file.) */
-STATIC int INIT bunzip2(unsigned char *buf, long len,
-			long (*fill)(void*, unsigned long),
-			long (*flush)(void*, unsigned long),
-			unsigned char *outbuf,
-			long *pos,
-			void(*error)(char *x))
-{
-	struct bunzip_data *bd;
-	int i = -1;
-	unsigned char *inbuf;
-
-	if (flush)
-		outbuf = malloc(BZIP2_IOBUF_SIZE);
-
-	if (!outbuf) {
-		error("Could not allocate output buffer");
-		return RETVAL_OUT_OF_MEMORY;
-	}
-	if (buf)
-		inbuf = buf;
-	else
-		inbuf = malloc(BZIP2_IOBUF_SIZE);
-	if (!inbuf) {
-		error("Could not allocate input buffer");
-		i = RETVAL_OUT_OF_MEMORY;
-		goto exit_0;
-	}
-	i = start_bunzip(&bd, inbuf, len, fill);
-	if (!i) {
-		for (;;) {
-			i = read_bunzip(bd, outbuf, BZIP2_IOBUF_SIZE);
-			if (i <= 0)
-				break;
-			if (!flush)
-				outbuf += i;
-			else
-				if (i != flush(outbuf, i)) {
-					i = RETVAL_UNEXPECTED_OUTPUT_EOF;
-					break;
-				}
-		}
-	}
-	/* Check CRC and release memory */
-	if (i == RETVAL_LAST_BLOCK) {
-		if (bd->headerCRC != bd->totalCRC)
-			error("Data integrity error when decompressing.");
-		else
-			i = RETVAL_OK;
-	} else if (i == RETVAL_UNEXPECTED_OUTPUT_EOF) {
-		error("Compressed file ends unexpectedly");
-	}
-	if (!bd)
-		goto exit_1;
-	if (bd->dbuf)
-		large_free(bd->dbuf);
-	if (pos)
-		*pos = bd->inbufPos;
-	free(bd);
-exit_1:
-	if (!buf)
-		free(inbuf);
-exit_0:
-	if (flush)
-		free(outbuf);
-	return i;
-}
-
-#ifdef PREBOOT
-STATIC int INIT __decompress(unsigned char *buf, long len,
-			long (*fill)(void*, unsigned long),
-			long (*flush)(void*, unsigned long),
-			unsigned char *outbuf, long olen,
-			long *pos,
-			void (*error)(char *x))
-{
-	return bunzip2(buf, len - 4, fill, flush, outbuf, pos, error);
-}
-#endif
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index e79bb1444b29..b7b55cc4d743 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -294,10 +294,10 @@ $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
 
 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 
-# Bzip2
+# Lzma
 # ---------------------------------------------------------------------------
 
-# Bzip2 and LZMA do not include size in file... so we have to fake that;
+# LZMA does not include size in file... so we have to fake that;
 # append the size as a 32-bit littleendian number as gzip does.
 size_append = printf $(shell						\
 dec_size=0;								\
@@ -314,14 +314,6 @@ printf "%08x\n" $$dec_size |						\
 	}								\
 )
 
-quiet_cmd_bzip2 = BZIP2   $@
-cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
-	bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
-	(rm -f $@ ; false)
-
-# Lzma
-# ---------------------------------------------------------------------------
-
 quiet_cmd_lzma = LZMA    $@
 cmd_lzma = (cat $(filter-out FORCE,$^) | \
 	lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
-- 
2.19.1

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