1 files changed, 2473 insertions, 0 deletions

diff --git a/archival/gzip.c b/archival/gzip.c
new file mode 100644
index 000000000..c9b67538e
--- /dev/null
+++ b/archival/gzip.c
@@ -0,0 +1,2473 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Gzip implementation for busybox
+ *
+ * Based on GNU gzip Copyright (C) 1992-1993 Jean-loup Gailly.
+ *
+ * Originally adjusted for busybox by Charles P. Wright <cpw@unix.asb.com>
+ *              "this is a stripped down version of gzip I put into busybox, it does
+ *              only standard in to standard out with -9 compression.  It also requires
+ *              the zcat module for some important functions."
+ *
+ * Adjusted further by Erik Andersen <andersen@codepoet.org> to support
+ * files as well as stdin/stdout, and to generally behave itself wrt
+ * command line handling.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+/* TODO: full support for -v for DESKTOP
+/usr/bin/gzip -v a bogus aa
+a:       85.1% -- replaced with a.gz
+gzip: bogus: No such file or directory
+aa:      85.1% -- replaced with aa.gz
+*/
+
+#define SMALL_MEM
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <utime.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <time.h>
+#include "busybox.h"
+
+typedef unsigned char uch;
+typedef unsigned short ush;
+typedef unsigned long ulg;
+
+/* Return codes from gzip */
+#define OK      0
+#define ERROR   1
+#define WARNING 2
+
+/* Compression methods (see algorithm.doc) */
+/* Only STORED and DEFLATED are supported by this BusyBox module */
+#define STORED      0
+/* methods 4 to 7 reserved */
+#define DEFLATED    8
+
+/* To save memory for 16 bit systems, some arrays are overlaid between
+ * the various modules:
+ * deflate:  prev+head   window      d_buf  l_buf  outbuf
+ * unlzw:    tab_prefix  tab_suffix  stack  inbuf  outbuf
+ * For compression, input is done in window[]. For decompression, output
+ * is done in window except for unlzw.
+ */
+
+#ifndef INBUFSIZ
+#  ifdef SMALL_MEM
+#    define INBUFSIZ  0x2000    /* input buffer size */
+#  else
+#    define INBUFSIZ  0x8000    /* input buffer size */
+#  endif
+#endif
+#define INBUF_EXTRA  64 /* required by unlzw() */
+
+#ifndef OUTBUFSIZ
+#  ifdef SMALL_MEM
+#    define OUTBUFSIZ   8192    /* output buffer size */
+#  else
+#    define OUTBUFSIZ  16384    /* output buffer size */
+#  endif
+#endif
+#define OUTBUF_EXTRA 2048       /* required by unlzw() */
+
+#ifndef DIST_BUFSIZE
+#  ifdef SMALL_MEM
+#    define DIST_BUFSIZE 0x2000 /* buffer for distances, see trees.c */
+#  else
+#    define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
+#  endif
+#endif
+
+#  define DECLARE(type, array, size)  static type * array
+#  define ALLOC(type, array, size) { \
+      array = (type*)xzalloc((size_t)(((size)+1L)/2) * 2*sizeof(type)); \
+   }
+#  define FREE(array) {free(array), array=NULL;}
+
+#define tab_suffix window
+#define tab_prefix prev /* hash link (see deflate.c) */
+#define head (prev+WSIZE)       /* hash head (see deflate.c) */
+
+static long bytes_in;   /* number of input bytes */
+
+#define isize bytes_in
+/* for compatibility with old zip sources (to be cleaned) */
+
+typedef int file_t;             /* Do not use stdio */
+
+#define NO_FILE  (-1)   /* in memory compression */
+
+
+#define PACK_MAGIC     "\037\036"       /* Magic header for packed files */
+#define GZIP_MAGIC     "\037\213"       /* Magic header for gzip files, 1F 8B */
+#define OLD_GZIP_MAGIC "\037\236"       /* Magic header for gzip 0.5 = freeze 1.x */
+#define LZH_MAGIC      "\037\240"       /* Magic header for SCO LZH Compress files */
+#define PKZIP_MAGIC    "\120\113\003\004"       /* Magic header for pkzip files */
+
+/* gzip flag byte */
+#define ASCII_FLAG   0x01       /* bit 0 set: file probably ascii text */
+#define CONTINUATION 0x02       /* bit 1 set: continuation of multi-part gzip file */
+#define EXTRA_FIELD  0x04       /* bit 2 set: extra field present */
+#define ORIG_NAME    0x08       /* bit 3 set: original file name present */
+#define COMMENT      0x10       /* bit 4 set: file comment present */
+#define RESERVED     0xC0       /* bit 6,7:   reserved */
+
+/* internal file attribute */
+#define UNKNOWN 0xffff
+#define BINARY  0
+#define ASCII   1
+
+#ifndef WSIZE
+#  define WSIZE 0x8000  /* window size--must be a power of two, and */
+#endif                  /*  at least 32K for zip's deflate method */
+
+#define MIN_MATCH  3
+#define MAX_MATCH  258
+/* The minimum and maximum match lengths */
+
+#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
+/* Minimum amount of lookahead, except at the end of the input file.
+ * See deflate.c for comments about the MIN_MATCH+1.
+ */
+
+#define MAX_DIST  (WSIZE-MIN_LOOKAHEAD)
+/* In order to simplify the code, particularly on 16 bit machines, match
+ * distances are limited to MAX_DIST instead of WSIZE.
+ */
+
+/* put_byte is used for the compressed output */
+#define put_byte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==OUTBUFSIZ)\
+   flush_outbuf();}
+
+#define seekable()    0 /* force sequential output */
+#define translate_eol 0 /* no option -a yet */
+
+/* Diagnostic functions */
+#ifdef DEBUG
+#  define Assert(cond,msg) {if(!(cond)) bb_error_msg(msg);}
+#  define Trace(x) fprintf x
+#  define Tracev(x) {if (verbose) fprintf x ;}
+#  define Tracevv(x) {if (verbose>1) fprintf x ;}
+#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
+#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
+#else
+#  define Assert(cond,msg)
+#  define Trace(x)
+#  define Tracev(x)
+#  define Tracevv(x)
+#  define Tracec(c,x)
+#  define Tracecv(c,x)
+#endif
+
+#define WARN(msg) {if (!quiet) fprintf msg ; \
+                   if (exit_code == OK) exit_code = WARNING;}
+
+#ifndef MAX_PATH_LEN
+#  define MAX_PATH_LEN   1024   /* max pathname length */
+#endif
+
+
+        /* from zip.c: */
+static int zip(int in, int out);
+static int file_read(char *buf, unsigned size);
+
+                /* from deflate.c */
+static void lm_init(ush * flags);
+static ulg deflate(void);
+
+                /* from trees.c */
+static void ct_init(ush * attr, int *methodp);
+static int ct_tally(int dist, int lc);
+static ulg flush_block(char *buf, ulg stored_len, int eof);
+
+                /* from bits.c */
+static void bi_init(file_t zipfile);
+static void send_bits(int value, int length);
+static unsigned bi_reverse(unsigned value, int length);
+static void bi_windup(void);
+static void copy_block(char *buf, unsigned len, int header);
+static int (*read_buf) (char *buf, unsigned size);
+
+        /* from util.c: */
+static void flush_outbuf(void);
+
+/* lzw.h -- define the lzw functions.
+ * Copyright (C) 1992-1993 Jean-loup Gailly.
+ * This is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License, see the file COPYING.
+ */
+
+#ifndef BITS
+#  define BITS 16
+#endif
+#define INIT_BITS 9             /* Initial number of bits per code */
+
+#define BIT_MASK    0x1f        /* Mask for 'number of compression bits' */
+/* Mask 0x20 is reserved to mean a fourth header byte, and 0x40 is free.
+ * It's a pity that old uncompress does not check bit 0x20. That makes
+ * extension of the format actually undesirable because old compress
+ * would just crash on the new format instead of giving a meaningful
+ * error message. It does check the number of bits, but it's more
+ * helpful to say "unsupported format, get a new version" than
+ * "can only handle 16 bits".
+ */
+
+/* tailor.h -- target dependent definitions
+ * Copyright (C) 1992-1993 Jean-loup Gailly.
+ * This is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License, see the file COPYING.
+ */
+
+/* The target dependent definitions should be defined here only.
+ * The target dependent functions should be defined in tailor.c.
+ */
+
+
+        /* Common defaults */
+
+#ifndef OS_CODE
+#  define OS_CODE  0x03 /* assume Unix */
+#endif
+
+#ifndef PATH_SEP
+#  define PATH_SEP '/'
+#endif
+
+#ifndef OPTIONS_VAR
+#  define OPTIONS_VAR "GZIP"
+#endif
+
+#ifndef Z_SUFFIX
+#  define Z_SUFFIX ".gz"
+#endif
+
+#ifdef MAX_EXT_CHARS
+#  define MAX_SUFFIX  MAX_EXT_CHARS
+#else
+#  define MAX_SUFFIX  30
+#endif
+
+                /* global buffers */
+
+DECLARE(uch, inbuf, INBUFSIZ + INBUF_EXTRA);
+DECLARE(uch, outbuf, OUTBUFSIZ + OUTBUF_EXTRA);
+DECLARE(ush, d_buf, DIST_BUFSIZE);
+DECLARE(uch, window, 2L * WSIZE);
+DECLARE(ush, tab_prefix, 1L << BITS);
+
+static int foreground;  /* set if program run in foreground */
+static int method = DEFLATED;   /* compression method */
+static int exit_code = OK;      /* program exit code */
+static long time_stamp; /* original time stamp (modification time) */
+static char z_suffix[MAX_SUFFIX + 1];   /* default suffix (can be set with --suffix) */
+
+static int ifd;                 /* input file descriptor */
+static int ofd;                 /* output file descriptor */
+#ifdef DEBUG
+static unsigned insize; /* valid bytes in inbuf */
+#endif
+static unsigned outcnt; /* bytes in output buffer */
+
+static uint32_t *crc_32_tab;
+
+/* Output a 16 bit value, lsb first */
+static void put_short(ush w)
+{
+        if (outcnt < OUTBUFSIZ - 2) {
+                outbuf[outcnt++] = (uch) ((w) & 0xff);
+                outbuf[outcnt++] = (uch) ((ush) (w) >> 8);
+        } else {
+                put_byte((uch) ((w) & 0xff));
+                put_byte((uch) ((ush) (w) >> 8));
+        }
+}
+
+/* ========================================================================
+ * Signal and error handler.
+ */
+static void abort_gzip(int ATTRIBUTE_UNUSED ignored)
+{
+        exit(ERROR);
+}
+
+/* ===========================================================================
+ * Clear input and output buffers
+ */
+static void clear_bufs(void)
+{
+        outcnt = 0;
+#ifdef DEBUG
+        insize = 0;
+#endif
+        bytes_in = 0L;
+}
+
+/* ===========================================================================
+ * Does the same as write(), but also handles partial pipe writes and checks
+ * for error return.
+ */
+static void write_buf(int fd, void *buf, unsigned cnt)
+{
+        unsigned n;
+
+        while ((n = write(fd, buf, cnt)) != cnt) {
+                if (n == (unsigned) (-1)) bb_error_msg_and_die(bb_msg_write_error);
+                cnt -= n;
+                buf = (void *) ((char *) buf + n);
+        }
+}
+
+/* ===========================================================================
+ * Run a set of bytes through the crc shift register.  If s is a NULL
+ * pointer, then initialize the crc shift register contents instead.
+ * Return the current crc in either case.
+ */
+static uint32_t updcrc(uch * s, unsigned n)
+{
+        static uint32_t crc = ~0;       /* shift register contents */
+        uint32_t c;             /* temporary variable */
+
+        if (s == NULL) {
+                c = ~0;
+        } else {
+                c = crc;
+                if (n)
+                        do {
+                                c = crc_32_tab[((int) c ^ (*s++)) & 0xff] ^ (c >> 8);
+                        } while (--n);
+        }
+        crc = c;
+        return ~c;
+}
+
+/* bits.c -- output variable-length bit strings
+ * Copyright (C) 1992-1993 Jean-loup Gailly
+ * This is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License, see the file COPYING.
+ */
+
+
+/*
+ *  PURPOSE
+ *
+ *      Output variable-length bit strings. Compression can be done
+ *      to a file or to memory. (The latter is not supported in this version.)
+ *
+ *  DISCUSSION
+ *
+ *      The PKZIP "deflate" file format interprets compressed file data
+ *      as a sequence of bits.  Multi-bit strings in the file may cross
+ *      byte boundaries without restriction.
+ *
+ *      The first bit of each byte is the low-order bit.
+ *
+ *      The routines in this file allow a variable-length bit value to
+ *      be output right-to-left (useful for literal values). For
+ *      left-to-right output (useful for code strings from the tree routines),
+ *      the bits must have been reversed first with bi_reverse().
+ *
+ *      For in-memory compression, the compressed bit stream goes directly
+ *      into the requested output buffer. The input data is read in blocks
+ *      by the mem_read() function. The buffer is limited to 64K on 16 bit
+ *      machines.
+ *
+ *  INTERFACE
+ *
+ *      void bi_init (FILE *zipfile)
+ *          Initialize the bit string routines.
+ *
+ *      void send_bits (int value, int length)
+ *          Write out a bit string, taking the source bits right to
+ *          left.
+ *
+ *      int bi_reverse (int value, int length)
+ *          Reverse the bits of a bit string, taking the source bits left to
+ *          right and emitting them right to left.
+ *
+ *      void bi_windup (void)
+ *          Write out any remaining bits in an incomplete byte.
+ *
+ *      void copy_block(char *buf, unsigned len, int header)
+ *          Copy a stored block to the zip file, storing first the length and
+ *          its one's complement if requested.
+ *
+ */
+
+/* ===========================================================================
+ * Local data used by the "bit string" routines.
+ */
+
+static file_t zfile;    /* output gzip file */
+
+static unsigned short bi_buf;
+
+/* Output buffer. bits are inserted starting at the bottom (least significant
+ * bits).
+ */
+
+#define Buf_size (8 * 2*sizeof(char))
+/* Number of bits used within bi_buf. (bi_buf might be implemented on
+ * more than 16 bits on some systems.)
+ */
+
+static int bi_valid;
+
+/* Current input function. Set to mem_read for in-memory compression */
+
+#ifdef DEBUG
+ulg bits_sent;                  /* bit length of the compressed data */
+#endif
+
+/* ===========================================================================
+ * Initialize the bit string routines.
+ */
+static void bi_init(file_t zipfile)
+{
+        zfile = zipfile;
+        bi_buf = 0;
+        bi_valid = 0;
+#ifdef DEBUG
+        bits_sent = 0L;
+#endif
+
+        /* Set the defaults for file compression. They are set by memcompress
+         * for in-memory compression.
+         */
+        if (zfile != NO_FILE) {
+                read_buf = file_read;
+        }
+}
+
+/* ===========================================================================
+ * Send a value on a given number of bits.
+ * IN assertion: length <= 16 and value fits in length bits.
+ */
+static void send_bits(int value, int length)
+{
+#ifdef DEBUG
+        Tracev((stderr, " l %2d v %4x ", length, value));
+        Assert(length > 0 && length <= 15, "invalid length");
+        bits_sent += (ulg) length;
+#endif
+        /* If not enough room in bi_buf, use (valid) bits from bi_buf and
+         * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
+         * unused bits in value.
+         */
+        if (bi_valid > (int) Buf_size - length) {
+                bi_buf |= (value << bi_valid);
+                put_short(bi_buf);
+                bi_buf = (ush) value >> (Buf_size - bi_valid);
+                bi_valid += length - Buf_size;
+        } else {
+                bi_buf |= value << bi_valid;
+                bi_valid += length;
+        }
+}
+
+/* ===========================================================================
+ * Reverse the first len bits of a code, using straightforward code (a faster
+ * method would use a table)
+ * IN assertion: 1 <= len <= 15
+ */
+static unsigned bi_reverse(unsigned code, int len)
+{
+        unsigned res = 0;
+
+        do {
+                res |= code & 1;
+                code >>= 1, res <<= 1;
+        } while (--len > 0);
+        return res >> 1;
+}
+
+/* ===========================================================================
+ * Write out any remaining bits in an incomplete byte.
+ */
+static void bi_windup(void)
+{
+        if (bi_valid > 8) {
+                put_short(bi_buf);
+        } else if (bi_valid > 0) {
+                put_byte(bi_buf);
+        }
+        bi_buf = 0;
+        bi_valid = 0;
+#ifdef DEBUG
+        bits_sent = (bits_sent + 7) & ~7;
+#endif
+}
+
+/* ===========================================================================
+ * Copy a stored block to the zip file, storing first the length and its
+ * one's complement if requested.
+ */
+static void copy_block(char *buf, unsigned len, int header)
+{
+        bi_windup();            /* align on byte boundary */
+
+        if (header) {
+                put_short((ush) len);
+                put_short((ush) ~ len);
+#ifdef DEBUG
+                bits_sent += 2 * 16;
+#endif
+        }
+#ifdef DEBUG
+        bits_sent += (ulg) len << 3;
+#endif
+        while (len--) {
+                put_byte(*buf++);
+        }
+}
+
+/* deflate.c -- compress data using the deflation algorithm
+ * Copyright (C) 1992-1993 Jean-loup Gailly
+ * This is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License, see the file COPYING.
+ */
+
+/*
+ *  PURPOSE
+ *
+ *      Identify new text as repetitions of old text within a fixed-
+ *      length sliding window trailing behind the new text.
+ *
+ *  DISCUSSION
+ *
+ *      The "deflation" process depends on being able to identify portions
+ *      of the input text which are identical to earlier input (within a
+ *      sliding window trailing behind the input currently being processed).
+ *
+ *      The most straightforward technique turns out to be the fastest for
+ *      most input files: try all possible matches and select the longest.
+ *      The key feature of this algorithm is that insertions into the string
+ *      dictionary are very simple and thus fast, and deletions are avoided
+ *      completely. Insertions are performed at each input character, whereas
+ *      string matches are performed only when the previous match ends. So it
+ *      is preferable to spend more time in matches to allow very fast string
+ *      insertions and avoid deletions. The matching algorithm for small
+ *      strings is inspired from that of Rabin & Karp. A brute force approach
+ *      is used to find longer strings when a small match has been found.
+ *      A similar algorithm is used in comic (by Jan-Mark Wams) and freeze
+ *      (by Leonid Broukhis).
+ *         A previous version of this file used a more sophisticated algorithm
+ *      (by Fiala and Greene) which is guaranteed to run in linear amortized
+ *      time, but has a larger average cost, uses more memory and is patented.
+ *      However the F&G algorithm may be faster for some highly redundant
+ *      files if the parameter max_chain_length (described below) is too large.
+ *
+ *  ACKNOWLEDGMENTS
+ *
+ *      The idea of lazy evaluation of matches is due to Jan-Mark Wams, and
+ *      I found it in 'freeze' written by Leonid Broukhis.
+ *      Thanks to many info-zippers for bug reports and testing.
+ *
+ *  REFERENCES
+ *
+ *      APPNOTE.TXT documentation file in PKZIP 1.93a distribution.
+ *
+ *      A description of the Rabin and Karp algorithm is given in the book
+ *         "Algorithms" by R. Sedgewick, Addison-Wesley, p252.
+ *
+ *      Fiala,E.R., and Greene,D.H.
+ *         Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595
+ *
+ *  INTERFACE
+ *
+ *      void lm_init (int pack_level, ush *flags)
+ *          Initialize the "longest match" routines for a new file
+ *
+ *      ulg deflate (void)
+ *          Processes a new input file and return its compressed length. Sets
+ *          the compressed length, crc, deflate flags and internal file
+ *          attributes.
+ */
+
+
+/* ===========================================================================
+ * Configuration parameters
+ */
+
+/* Compile with MEDIUM_MEM to reduce the memory requirements or
+ * with SMALL_MEM to use as little memory as possible. Use BIG_MEM if the
+ * entire input file can be held in memory (not possible on 16 bit systems).
+ * Warning: defining these symbols affects HASH_BITS (see below) and thus
+ * affects the compression ratio. The compressed output
+ * is still correct, and might even be smaller in some cases.
+ */
+
+#ifdef SMALL_MEM
+#   define HASH_BITS  13        /* Number of bits used to hash strings */
+#endif
+#ifdef MEDIUM_MEM
+#   define HASH_BITS  14
+#endif
+#ifndef HASH_BITS
+#   define HASH_BITS  15
+   /* For portability to 16 bit machines, do not use values above 15. */
+#endif
+
+/* To save space (see unlzw.c), we overlay prev+head with tab_prefix and
+ * window with tab_suffix. Check that we can do this:
+ */
+#if (WSIZE<<1) > (1<<BITS)
+#  error cannot overlay window with tab_suffix and prev with tab_prefix0
+#endif
+#if HASH_BITS > BITS-1
+#  error cannot overlay head with tab_prefix1
+#endif
+#define HASH_SIZE (unsigned)(1<<HASH_BITS)
+#define HASH_MASK (HASH_SIZE-1)
+#define WMASK     (WSIZE-1)
+/* HASH_SIZE and WSIZE must be powers of two */
+#define NIL 0
+/* Tail of hash chains */
+#define FAST 4
+#define SLOW 2
+/* speed options for the general purpose bit flag */
+#ifndef TOO_FAR
+#  define TOO_FAR 4096
+#endif
+/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */
+/* ===========================================================================
+ * Local data used by the "longest match" routines.
+ */
+typedef ush Pos;
+typedef unsigned IPos;
+
+/* A Pos is an index in the character window. We use short instead of int to
+ * save space in the various tables. IPos is used only for parameter passing.
+ */
+
+/* DECLARE(uch, window, 2L*WSIZE); */
+/* Sliding window. Input bytes are read into the second half of the window,
+ * and move to the first half later to keep a dictionary of at least WSIZE
+ * bytes. With this organization, matches are limited to a distance of
+ * WSIZE-MAX_MATCH bytes, but this ensures that IO is always
+ * performed with a length multiple of the block size. Also, it limits
+ * the window size to 64K, which is quite useful on MSDOS.
+ * To do: limit the window size to WSIZE+BSZ if SMALL_MEM (the code would
+ * be less efficient).
+ */
+
+/* DECLARE(Pos, prev, WSIZE); */
+/* Link to older string with same hash index. To limit the size of this
+ * array to 64K, this link is maintained only for the last 32K strings.
+ * An index in this array is thus a window index modulo 32K.
+ */
+
+/* DECLARE(Pos, head, 1<<HASH_BITS); */
+/* Heads of the hash chains or NIL. */
+
+static const ulg window_size = (ulg) 2 * WSIZE;
+
+/* window size, 2*WSIZE except for MMAP or BIG_MEM, where it is the
+ * input file length plus MIN_LOOKAHEAD.
+ */
+
+static long block_start;
+
+/* window position at the beginning of the current output block. Gets
+ * negative when the window is moved backwards.
+ */
+
+static unsigned ins_h;  /* hash index of string to be inserted */
+
+#define H_SHIFT  ((HASH_BITS+MIN_MATCH-1)/MIN_MATCH)
+/* Number of bits by which ins_h and del_h must be shifted at each
+ * input step. It must be such that after MIN_MATCH steps, the oldest
+ * byte no longer takes part in the hash key, that is:
+ *   H_SHIFT * MIN_MATCH >= HASH_BITS
+ */
+
+static unsigned int prev_length;
+
+/* Length of the best match at previous step. Matches not greater than this
+ * are discarded. This is used in the lazy match evaluation.
+ */
+
+static unsigned strstart;       /* start of string to insert */
+static unsigned match_start;    /* start of matching string */
+static int eofile;              /* flag set at end of input file */
+static unsigned lookahead;      /* number of valid bytes ahead in window */
+
+enum {
+        max_chain_length = 4096,
+
+/* To speed up deflation, hash chains are never searched beyond this length.
+ * A higher limit improves compression ratio but degrades the speed.
+ */
+
+        max_lazy_match = 258,
+
+/* Attempt to find a better match only when the current match is strictly
+ * smaller than this value. This mechanism is used only for compression
+ * levels >= 4.
+ */
+        max_insert_length = max_lazy_match,
+/* Insert new strings in the hash table only if the match length
+ * is not greater than this length. This saves time but degrades compression.
+ * max_insert_length is used only for compression levels <= 3.
+ */
+
+        good_match = 32,
+
+/* Use a faster search when the previous match is longer than this */
+
+
+/* Values for max_lazy_match, good_match and max_chain_length, depending on
+ * the desired pack level (0..9). The values given below have been tuned to
+ * exclude worst case performance for pathological files. Better values may be
+ * found for specific files.
+ */
+
+        nice_match = 258        /* Stop searching when current match exceeds this */
+
+/* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4
+ * For deflate_fast() (levels <= 3) good is ignored and lazy has a different
+ * meaning.
+ */
+};
+
+#define EQUAL 0
+/* result of memcmp for equal strings */
+
+/* ===========================================================================
+ *  Prototypes for local functions.
+ */
+static void fill_window(void);
+
+static int longest_match(IPos cur_match);
+
+#ifdef DEBUG
+static void check_match(IPos start, IPos match, int length);
+#endif
+
+/* ===========================================================================
+ * Update a hash value with the given input byte
+ * IN  assertion: all calls to to UPDATE_HASH are made with consecutive
+ *    input characters, so that a running hash key can be computed from the
+ *    previous key instead of complete recalculation each time.
+ */
+#define UPDATE_HASH(h,c) (h = (((h)<<H_SHIFT) ^ (c)) & HASH_MASK)
+
+/* ===========================================================================
+ * Insert string s in the dictionary and set match_head to the previous head
+ * of the hash chain (the most recent string with same hash key). Return
+ * the previous length of the hash chain.
+ * IN  assertion: all calls to to INSERT_STRING are made with consecutive
+ *    input characters and the first MIN_MATCH bytes of s are valid
+ *    (except for the last MIN_MATCH-1 bytes of the input file).
+ */
+#define INSERT_STRING(s, match_head) \
+   (UPDATE_HASH(ins_h, window[(s) + MIN_MATCH-1]), \
+    prev[(s) & WMASK] = match_head = head[ins_h], \
+    head[ins_h] = (s))
+
+/* ===========================================================================
+ * Initialize the "longest match" routines for a new file
+ */
+static void lm_init(ush * flags)
+{
+        unsigned j;
+
+        /* Initialize the hash table. */
+        memset(head, 0, HASH_SIZE * sizeof(*head));
+        /* prev will be initialized on the fly */
+
+        *flags |= SLOW;
+        /* ??? reduce max_chain_length for binary files */
+
+        strstart = 0;
+        block_start = 0L;
+
+        lookahead = read_buf((char *) window,
+                                                 sizeof(int) <= 2 ? (unsigned) WSIZE : 2 * WSIZE);
+
+        if (lookahead == 0 || lookahead == (unsigned) EOF) {
+                eofile = 1, lookahead = 0;
+                return;
+        }
+        eofile = 0;
+        /* Make sure that we always have enough lookahead. This is important
+         * if input comes from a device such as a tty.
+         */
+        while (lookahead < MIN_LOOKAHEAD && !eofile)
+                fill_window();
+
+        ins_h = 0;
+        for (j = 0; j < MIN_MATCH - 1; j++)
+                UPDATE_HASH(ins_h, window[j]);
+        /* If lookahead < MIN_MATCH, ins_h is garbage, but this is
+         * not important since only literal bytes will be emitted.
+         */
+}
+
+/* ===========================================================================
+ * Set match_start to the longest match starting at the given string and
+ * return its length. Matches shorter or equal to prev_length are discarded,
+ * in which case the result is equal to prev_length and match_start is
+ * garbage.
+ * IN assertions: cur_match is the head of the hash chain for the current
+ *   string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
+ */
+
+/* For MSDOS, OS/2 and 386 Unix, an optimized version is in match.asm or
+ * match.s. The code is functionally equivalent, so you can use the C version
+ * if desired.
+ */
+static int longest_match(IPos cur_match)
+{
+        unsigned chain_length = max_chain_length;       /* max hash chain length */
+        uch *scan = window + strstart;  /* current string */
+        uch *match;     /* matched string */
+        int len;        /* length of current match */
+        int best_len = prev_length;     /* best match length so far */
+        IPos limit =
+                strstart > (IPos) MAX_DIST ? strstart - (IPos) MAX_DIST : NIL;
+        /* Stop when cur_match becomes <= limit. To simplify the code,
+         * we prevent matches with the string of window index 0.
+         */
+
+/* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
+ * It is easy to get rid of this optimization if necessary.
+ */
+#if HASH_BITS < 8 || MAX_MATCH != 258
+#  error Code too clever
+#endif
+        uch *strend = window + strstart + MAX_MATCH;
+        uch scan_end1 = scan[best_len - 1];
+        uch scan_end = scan[best_len];
+
+        /* Do not waste too much time if we already have a good match: */
+        if (prev_length >= good_match) {
+                chain_length >>= 2;
+        }
+        Assert(strstart <= window_size - MIN_LOOKAHEAD, "insufficient lookahead");
+
+        do {
+                Assert(cur_match < strstart, "no future");
+                match = window + cur_match;
+
+                /* Skip to next match if the match length cannot increase
+                 * or if the match length is less than 2:
+                 */
+                if (match[best_len] != scan_end ||
+                        match[best_len - 1] != scan_end1 ||
+                        *match != *scan || *++match != scan[1])
+                        continue;
+
+                /* The check at best_len-1 can be removed because it will be made
+                 * again later. (This heuristic is not always a win.)
+                 * It is not necessary to compare scan[2] and match[2] since they
+                 * are always equal when the other bytes match, given that
+                 * the hash keys are equal and that HASH_BITS >= 8.
+                 */
+                scan += 2, match++;
+
+                /* We check for insufficient lookahead only every 8th comparison;
+                 * the 256th check will be made at strstart+258.
+                 */
+                do {
+                } while (*++scan == *++match && *++scan == *++match &&
+                                 *++scan == *++match && *++scan == *++match &&
+                                 *++scan == *++match && *++scan == *++match &&
+                                 *++scan == *++match && *++scan == *++match && scan < strend);
+
+                len = MAX_MATCH - (int) (strend - scan);
+                scan = strend - MAX_MATCH;
+
+                if (len > best_len) {
+                        match_start = cur_match;
+                        best_len = len;
+                        if (len >= nice_match)
+                                break;
+                        scan_end1 = scan[best_len - 1];
+                        scan_end = scan[best_len];
+                }
+        } while ((cur_match = prev[cur_match & WMASK]) > limit
+                         && --chain_length != 0);
+
+        return best_len;
+}
+
+#ifdef DEBUG
+/* ===========================================================================
+ * Check that the match at match_start is indeed a match.
+ */
+static void check_match(IPos start, IPos match, int length)
+{
+        /* check that the match is indeed a match */
+        if (memcmp((char *) window + match,
+                           (char *) window + start, length) != EQUAL) {
+                bb_error_msg(" start %d, match %d, length %d", start, match, length);
+                bb_error_msg("invalid match");
+        }
+        if (verbose > 1) {
+                bb_error_msg("\\[%d,%d]", start - match, length);
+                do {
+                        putc(window[start++], stderr);
+                } while (--length != 0);
+        }
+}
+#else
+#  define check_match(start, match, length)
+#endif
+
+/* ===========================================================================
+ * Fill the window when the lookahead becomes insufficient.
+ * Updates strstart and lookahead, and sets eofile if end of input file.
+ * IN assertion: lookahead < MIN_LOOKAHEAD && strstart + lookahead > 0
+ * OUT assertions: at least one byte has been read, or eofile is set;
+ *    file reads are performed for at least two bytes (required for the
+ *    translate_eol option).
+ */
+static void fill_window(void)
+{
+        unsigned n, m;
+        unsigned more =
+                (unsigned) (window_size - (ulg) lookahead - (ulg) strstart);
+        /* Amount of free space at the end of the window. */
+
+        /* If the window is almost full and there is insufficient lookahead,
+         * move the upper half to the lower one to make room in the upper half.
+         */
+        if (more == (unsigned) EOF) {
+                /* Very unlikely, but possible on 16 bit machine if strstart == 0
+                 * and lookahead == 1 (input done one byte at time)
+                 */
+                more--;
+        } else if (strstart >= WSIZE + MAX_DIST) {
+                /* By the IN assertion, the window is not empty so we can't confuse
+                 * more == 0 with more == 64K on a 16 bit machine.
+                 */
+                Assert(window_size == (ulg) 2 * WSIZE, "no sliding with BIG_MEM");
+
+                memcpy((char *) window, (char *) window + WSIZE, (unsigned) WSIZE);
+                match_start -= WSIZE;
+                strstart -= WSIZE;      /* we now have strstart >= MAX_DIST: */
+
+                block_start -= (long) WSIZE;
+
+                for (n = 0; n < HASH_SIZE; n++) {
+                        m = head[n];
+                        head[n] = (Pos) (m >= WSIZE ? m - WSIZE : NIL);
+                }
+                for (n = 0; n < WSIZE; n++) {
+                        m = prev[n];
+                        prev[n] = (Pos) (m >= WSIZE ? m - WSIZE : NIL);
+                        /* If n is not on any hash chain, prev[n] is garbage but
+                         * its value will never be used.
+                         */
+                }
+                more += WSIZE;
+        }
+        /* At this point, more >= 2 */
+        if (!eofile) {
+                n = read_buf((char *) window + strstart + lookahead, more);
+                if (n == 0 || n == (unsigned) EOF) {
+                        eofile = 1;
+                } else {
+                        lookahead += n;
+                }
+        }
+}
+
+/* ===========================================================================
+ * Flush the current block, with given end-of-file flag.
+ * IN assertion: strstart is set to the end of the current match.
+ */
+#define FLUSH_BLOCK(eof) \
+   flush_block(block_start >= 0L ? (char*)&window[(unsigned)block_start] : \
+                (char*)NULL, (long)strstart - block_start, (eof))
+
+/* ===========================================================================
+ * Same as above, but achieves better compression. We use a lazy
+ * evaluation for matches: a match is finally adopted only if there is
+ * no better match at the next window position.
+ */
+static ulg deflate(void)
+{
+        IPos hash_head;         /* head of hash chain */
+        IPos prev_match;        /* previous match */
+        int flush;                      /* set if current block must be flushed */
+        int match_available = 0;        /* set if previous match exists */
+        unsigned match_length = MIN_MATCH - 1;  /* length of best match */
+
+        /* Process the input block. */
+        while (lookahead != 0) {
+                /* Insert the string window[strstart .. strstart+2] in the
+                 * dictionary, and set hash_head to the head of the hash chain:
+                 */
+                INSERT_STRING(strstart, hash_head);
+
+                /* Find the longest match, discarding those <= prev_length.
+                 */
+                prev_length = match_length, prev_match = match_start;
+                match_length = MIN_MATCH - 1;
+
+                if (hash_head != NIL && prev_length < max_lazy_match &&
+                        strstart - hash_head <= MAX_DIST) {
+                        /* To simplify the code, we prevent matches with the string
+                         * of window index 0 (in particular we have to avoid a match
+                         * of the string with itself at the start of the input file).
+                         */
+                        match_length = longest_match(hash_head);
+                        /* longest_match() sets match_start */
+                        if (match_length > lookahead)
+                                match_length = lookahead;
+
+                        /* Ignore a length 3 match if it is too distant: */
+                        if (match_length == MIN_MATCH && strstart - match_start > TOO_FAR) {
+                                /* If prev_match is also MIN_MATCH, match_start is garbage
+                                 * but we will ignore the current match anyway.
+                                 */
+                                match_length--;
+                        }
+                }
+                /* If there was a match at the previous step and the current
+                 * match is not better, output the previous match:
+                 */
+                if (prev_length >= MIN_MATCH && match_length <= prev_length) {
+
+                        check_match(strstart - 1, prev_match, prev_length);
+
+                        flush =
+                                ct_tally(strstart - 1 - prev_match, prev_length - MIN_MATCH);
+
+                        /* Insert in hash table all strings up to the end of the match.
+                         * strstart-1 and strstart are already inserted.
+                         */
+                        lookahead -= prev_length - 1;
+                        prev_length -= 2;
+                        do {
+                                strstart++;
+                                INSERT_STRING(strstart, hash_head);
+                                /* strstart never exceeds WSIZE-MAX_MATCH, so there are
+                                 * always MIN_MATCH bytes ahead. If lookahead < MIN_MATCH
+                                 * these bytes are garbage, but it does not matter since the
+                                 * next lookahead bytes will always be emitted as literals.
+                                 */
+                        } while (--prev_length != 0);
+                        match_available = 0;
+                        match_length = MIN_MATCH - 1;
+                        strstart++;
+                        if (flush)
+                                FLUSH_BLOCK(0), block_start = strstart;
+
+                } else if (match_available) {
+                        /* If there was no match at the previous position, output a
+                         * single literal. If there was a match but the current match
+                         * is longer, truncate the previous match to a single literal.
+                         */
+                        Tracevv((stderr, "%c", window[strstart - 1]));
+                        if (ct_tally(0, window[strstart - 1])) {
+                                FLUSH_BLOCK(0), block_start = strstart;
+                        }
+                        strstart++;
+                        lookahead--;
+                } else {
+                        /* There is no previous match to compare with, wait for
+                         * the next step to decide.
+                         */
+                        match_available = 1;
+                        strstart++;
+                        lookahead--;
+                }
+                Assert(strstart <= isize && lookahead <= isize, "a bit too far");
+
+                /* Make sure that we always have enough lookahead, except
+                 * at the end of the input file. We need MAX_MATCH bytes
+                 * for the next match, plus MIN_MATCH bytes to insert the
+                 * string following the next match.
+                 */
+                while (lookahead < MIN_LOOKAHEAD && !eofile)
+                        fill_window();
+        }
+        if (match_available)
+                ct_tally(0, window[strstart - 1]);
+
+        return FLUSH_BLOCK(1);  /* eof */
+}
+
+/* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
+ * Copyright (C) 1992-1993 Jean-loup Gailly
+ * The unzip code was written and put in the public domain by Mark Adler.
+ * Portions of the lzw code are derived from the public domain 'compress'
+ * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
+ * Ken Turkowski, Dave Mack and Peter Jannesen.
+ *
+ * See the license_msg below and the file COPYING for the software license.
+ * See the file algorithm.doc for the compression algorithms and file formats.
+ */
+
+/* Compress files with zip algorithm and 'compress' interface.
+ * See usage() and help() functions below for all options.
+ * Outputs:
+ *        file.gz:   compressed file with same mode, owner, and utimes
+ *     or stdout with -c option or if stdin used as input.
+ * If the output file name had to be truncated, the original name is kept
+ * in the compressed file.
+ */
+
+                /* configuration */
+
+typedef struct dirent dir_type;
+
+/* ======================================================================== */
+int gzip_main(int argc, char **argv)
+{
+        enum {
+                OPT_tostdout = 0x1,
+                OPT_force = 0x2,
+        };
+
+        unsigned opt;
+        int result;
+        int inFileNum;
+        int outFileNum;
+        struct stat statBuf;
+        char *delFileName;
+
+        opt = getopt32(argc, argv, "cf123456789qv" USE_GUNZIP("d"));
+        //if (opt & 0x1) // -c
+        //if (opt & 0x2) // -f
+        /* Ignore 1-9 (compression level) options */
+        //if (opt & 0x4) // -1
+        //if (opt & 0x8) // -2
+        //if (opt & 0x10) // -3
+        //if (opt & 0x20) // -4
+        //if (opt & 0x40) // -5
+        //if (opt & 0x80) // -6
+        //if (opt & 0x100) // -7
+        //if (opt & 0x200) // -8
+        //if (opt & 0x400) // -9
+        //if (opt & 0x800) // -q
+        //if (opt & 0x1000) // -v
+        if (ENABLE_GUNZIP && (opt & 0x2000)) { // -d
+                /* FIXME: getopt32 should not depend on optind */
+                optind = 1;
+                return gunzip_main(argc, argv);
+        }
+
+        foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
+        if (foreground) {
+                (void) signal(SIGINT, abort_gzip);
+        }
+#ifdef SIGTERM
+        if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
+                (void) signal(SIGTERM, abort_gzip);
+        }
+#endif
+#ifdef SIGHUP
+        if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
+                (void) signal(SIGHUP, abort_gzip);
+        }
+#endif
+
+        strncpy(z_suffix, Z_SUFFIX, sizeof(z_suffix) - 1);
+
+        /* Allocate all global buffers (for DYN_ALLOC option) */
+        ALLOC(uch, inbuf, INBUFSIZ + INBUF_EXTRA);
+        ALLOC(uch, outbuf, OUTBUFSIZ + OUTBUF_EXTRA);
+        ALLOC(ush, d_buf, DIST_BUFSIZE);
+        ALLOC(uch, window, 2L * WSIZE);
+        ALLOC(ush, tab_prefix, 1L << BITS);
+
+        /* Initialise the CRC32 table */
+        crc_32_tab = crc32_filltable(0);
+
+        clear_bufs();
+
+        if (optind == argc) {
+                time_stamp = 0;
+                zip(STDIN_FILENO, STDOUT_FILENO);
+        } else {
+                int i;
+
+                for (i = optind; i < argc; i++) {
+                        char *path = NULL;
+
+                        clear_bufs();
+                        if (strcmp(argv[i], "-") == 0) {
+                                time_stamp = 0;
+                                inFileNum = STDIN_FILENO;
+                                outFileNum = STDOUT_FILENO;
+                        } else {
+                                inFileNum = xopen(argv[i], O_RDONLY);
+                                if (fstat(inFileNum, &statBuf) < 0)
+                                        bb_perror_msg_and_die("%s", argv[i]);
+                                time_stamp = statBuf.st_ctime;
+
+                                if (!(opt & OPT_tostdout)) {
+                                        path = xasprintf("%s.gz", argv[i]);
+
+                                        /* Open output file */
+#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1) && defined O_NOFOLLOW
+                                        outFileNum =
+                                                open(path, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW);
+#else
+                                        outFileNum = open(path, O_RDWR | O_CREAT | O_EXCL);
+#endif
+                                        if (outFileNum < 0) {
+                                                bb_perror_msg("%s", path);
+                                                free(path);
+                                                continue;
+                                        }
+
+                                        /* Set permissions on the file */
+                                        fchmod(outFileNum, statBuf.st_mode);
+                                } else
+                                        outFileNum = STDOUT_FILENO;
+                        }
+
+                        if (path == NULL && isatty(outFileNum) && !(opt & OPT_force)) {
+                                bb_error_msg
+                                        ("compressed data not written to a terminal. Use -f to force compression.");
+                                free(path);
+                                continue;
+                        }
+
+                        result = zip(inFileNum, outFileNum);
+
+                        if (path != NULL) {
+                                close(inFileNum);
+                                close(outFileNum);
+
+                                /* Delete the original file */
+                                if (result == OK)
+                                        delFileName = argv[i];
+                                else
+                                        delFileName = path;
+
+                                if (unlink(delFileName) < 0)
+                                        bb_perror_msg("%s", delFileName);
+                        }
+
+                        free(path);
+                }
+        }
+
+        return exit_code;
+}
+
+/* trees.c -- output deflated data using Huffman coding
+ * Copyright (C) 1992-1993 Jean-loup Gailly
+ * This is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License, see the file COPYING.
+ */
+
+/*
+ *  PURPOSE
+ *
+ *      Encode various sets of source values using variable-length
+ *      binary code trees.
+ *
+ *  DISCUSSION
+ *
+ *      The PKZIP "deflation" process uses several Huffman trees. The more
+ *      common source values are represented by shorter bit sequences.
+ *
+ *      Each code tree is stored in the ZIP file in a compressed form
+ *      which is itself a Huffman encoding of the lengths of
+ *      all the code strings (in ascending order by source values).
+ *      The actual code strings are reconstructed from the lengths in
+ *      the UNZIP process, as described in the "application note"
+ *      (APPNOTE.TXT) distributed as part of PKWARE's PKZIP program.
+ *
+ *  REFERENCES
+ *
+ *      Lynch, Thomas J.
+ *          Data Compression:  Techniques and Applications, pp. 53-55.
+ *          Lifetime Learning Publications, 1985.  ISBN 0-534-03418-7.
+ *
+ *      Storer, James A.
+ *          Data Compression:  Methods and Theory, pp. 49-50.
+ *          Computer Science Press, 1988.  ISBN 0-7167-8156-5.
+ *
+ *      Sedgewick, R.
+ *          Algorithms, p290.
+ *          Addison-Wesley, 1983. ISBN 0-201-06672-6.
+ *
+ *  INTERFACE
+ *
+ *      void ct_init (ush *attr, int *methodp)
+ *          Allocate the match buffer, initialize the various tables and save
+ *          the location of the internal file attribute (ascii/binary) and
+ *          method (DEFLATE/STORE)
+ *
+ *      void ct_tally (int dist, int lc);
+ *          Save the match info and tally the frequency counts.
+ *
+ *      long flush_block (char *buf, ulg stored_len, int eof)
+ *          Determine the best encoding for the current block: dynamic trees,
+ *          static trees or store, and output the encoded block to the zip
+ *          file. Returns the total compressed length for the file so far.
+ *
+ */
+
+/* ===========================================================================
+ * Constants
+ */
+
+#define MAX_BITS 15
+/* All codes must not exceed MAX_BITS bits */
+
+#define MAX_BL_BITS 7
+/* Bit length codes must not exceed MAX_BL_BITS bits */
+
+#define LENGTH_CODES 29
+/* number of length codes, not counting the special END_BLOCK code */
+
+#define LITERALS  256
+/* number of literal bytes 0..255 */
+
+#define END_BLOCK 256
+/* end of block literal code */
+
+#define L_CODES (LITERALS+1+LENGTH_CODES)
+/* number of Literal or Length codes, including the END_BLOCK code */
+
+#define D_CODES   30
+/* number of distance codes */
+
+#define BL_CODES  19
+/* number of codes used to transfer the bit lengths */
+
+typedef uch extra_bits_t;
+
+/* extra bits for each length code */
+static const extra_bits_t extra_lbits[LENGTH_CODES]
+        = { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4,
+        4, 4, 5, 5, 5, 5, 0
+};
+
+/* extra bits for each distance code */
+static const extra_bits_t extra_dbits[D_CODES]
+        = { 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9,
+        10, 10, 11, 11, 12, 12, 13, 13
+};
+
+/* extra bits for each bit length code */
+static const extra_bits_t extra_blbits[BL_CODES]
+= { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 7 };
+
+#define STORED_BLOCK 0
+#define STATIC_TREES 1
+#define DYN_TREES    2
+/* The three kinds of block type */
+
+#ifndef LIT_BUFSIZE
+#  ifdef SMALL_MEM
+#    define LIT_BUFSIZE  0x2000
+#  else
+#  ifdef MEDIUM_MEM
+#    define LIT_BUFSIZE  0x4000
+#  else
+#    define LIT_BUFSIZE  0x8000
+#  endif
+#  endif
+#endif
+#ifndef DIST_BUFSIZE
+#  define DIST_BUFSIZE  LIT_BUFSIZE
+#endif
+/* Sizes of match buffers for literals/lengths and distances.  There are
+ * 4 reasons for limiting LIT_BUFSIZE to 64K:
+ *   - frequencies can be kept in 16 bit counters
+ *   - if compression is not successful for the first block, all input data is
+ *     still in the window so we can still emit a stored block even when input
+ *     comes from standard input.  (This can also be done for all blocks if
+ *     LIT_BUFSIZE is not greater than 32K.)
+ *   - if compression is not successful for a file smaller than 64K, we can
+ *     even emit a stored file instead of a stored block (saving 5 bytes).
+ *   - creating new Huffman trees less frequently may not provide fast
+ *     adaptation to changes in the input data statistics. (Take for
+ *     example a binary file with poorly compressible code followed by
+ *     a highly compressible string table.) Smaller buffer sizes give
+ *     fast adaptation but have of course the overhead of transmitting trees
+ *     more frequently.
+ *   - I can't count above 4
+ * The current code is general and allows DIST_BUFSIZE < LIT_BUFSIZE (to save
+ * memory at the expense of compression). Some optimizations would be possible
+ * if we rely on DIST_BUFSIZE == LIT_BUFSIZE.
+ */
+#if LIT_BUFSIZE > INBUFSIZ
+#error cannot overlay l_buf and inbuf
+#endif
+#define REP_3_6      16
+/* repeat previous bit length 3-6 times (2 bits of repeat count) */
+#define REPZ_3_10    17
+/* repeat a zero length 3-10 times  (3 bits of repeat count) */
+#define REPZ_11_138  18
+/* repeat a zero length 11-138 times  (7 bits of repeat count) */
+
+/* ===========================================================================
+ * Local data
+ */
+
+/* Data structure describing a single value and its code string. */
+typedef struct ct_data {
+        union {
+                ush freq;               /* frequency count */
+                ush code;               /* bit string */
+        } fc;
+        union {
+                ush dad;                /* father node in Huffman tree */
+                ush len;                /* length of bit string */
+        } dl;
+} ct_data;
+
+#define Freq fc.freq
+#define Code fc.code
+#define Dad  dl.dad
+#define Len  dl.len
+
+#define HEAP_SIZE (2*L_CODES+1)
+/* maximum heap size */
+
+static ct_data dyn_ltree[HEAP_SIZE];    /* literal and length tree */
+static ct_data dyn_dtree[2 * D_CODES + 1];      /* distance tree */
+
+static ct_data static_ltree[L_CODES + 2];
+
+/* The static literal tree. Since the bit lengths are imposed, there is no
+ * need for the L_CODES extra codes used during heap construction. However
+ * The codes 286 and 287 are needed to build a canonical tree (see ct_init
+ * below).
+ */
+
+static ct_data static_dtree[D_CODES];
+
+/* The static distance tree. (Actually a trivial tree since all codes use
+ * 5 bits.)
+ */
+
+static ct_data bl_tree[2 * BL_CODES + 1];
+
+/* Huffman tree for the bit lengths */
+
+typedef struct tree_desc {
+        ct_data *dyn_tree;      /* the dynamic tree */
+        ct_data *static_tree;   /* corresponding static tree or NULL */
+        const extra_bits_t *extra_bits; /* extra bits for each code or NULL */
+        int extra_base;         /* base index for extra_bits */
+        int elems;                      /* max number of elements in the tree */
+        int max_length;         /* max bit length for the codes */
+        int max_code;           /* largest code with non zero frequency */
+} tree_desc;
+
+static tree_desc l_desc =
+        { dyn_ltree, static_ltree, extra_lbits, LITERALS + 1, L_CODES,
+        MAX_BITS, 0
+};
+
+static tree_desc d_desc =
+        { dyn_dtree, static_dtree, extra_dbits, 0, D_CODES, MAX_BITS, 0 };
+
+static tree_desc bl_desc =
+        { bl_tree, (ct_data *) 0, extra_blbits, 0, BL_CODES, MAX_BL_BITS,
+        0
+};
+
+
+static ush bl_count[MAX_BITS + 1];
+
+/* number of codes at each bit length for an optimal tree */
+
+static const uch bl_order[BL_CODES]
+= { 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 };
+
+/* The lengths of the bit length codes are sent in order of decreasing
+ * probability, to avoid transmitting the lengths for unused bit length codes.
+ */
+
+static int heap[2 * L_CODES + 1];       /* heap used to build the Huffman trees */
+static int heap_len;    /* number of elements in the heap */
+static int heap_max;    /* element of largest frequency */
+
+/* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
+ * The same heap array is used to build all trees.
+ */
+
+static uch depth[2 * L_CODES + 1];
+
+/* Depth of each subtree used as tie breaker for trees of equal frequency */
+
+static uch length_code[MAX_MATCH - MIN_MATCH + 1];
+
+/* length code for each normalized match length (0 == MIN_MATCH) */
+
+static uch dist_code[512];
+
+/* distance codes. The first 256 values correspond to the distances
+ * 3 .. 258, the last 256 values correspond to the top 8 bits of
+ * the 15 bit distances.
+ */
+
+static int base_length[LENGTH_CODES];
+
+/* First normalized length for each code (0 = MIN_MATCH) */
+
+static int base_dist[D_CODES];
+
+/* First normalized distance for each code (0 = distance of 1) */
+
+#define l_buf inbuf
+/* DECLARE(uch, l_buf, LIT_BUFSIZE);  buffer for literals or lengths */
+
+/* DECLARE(ush, d_buf, DIST_BUFSIZE); buffer for distances */
+
+static uch flag_buf[(LIT_BUFSIZE / 8)];
+
+/* flag_buf is a bit array distinguishing literals from lengths in
+ * l_buf, thus indicating the presence or absence of a distance.
+ */
+
+static unsigned last_lit;       /* running index in l_buf */
+static unsigned last_dist;      /* running index in d_buf */
+static unsigned last_flags;     /* running index in flag_buf */
+static uch flags;               /* current flags not yet saved in flag_buf */
+static uch flag_bit;    /* current bit used in flags */
+
+/* bits are filled in flags starting at bit 0 (least significant).
+ * Note: these flags are overkill in the current code since we don't
+ * take advantage of DIST_BUFSIZE == LIT_BUFSIZE.
+ */
+
+static ulg opt_len;             /* bit length of current block with optimal trees */
+static ulg static_len;  /* bit length of current block with static trees */
+
+static ulg compressed_len;      /* total bit length of compressed file */
+
+
+static ush *file_type;  /* pointer to UNKNOWN, BINARY or ASCII */
+static int *file_method;        /* pointer to DEFLATE or STORE */
+
+/* ===========================================================================
+ * Local (static) routines in this file.
+ */
+
+static void init_block(void);
+static void pqdownheap(ct_data * tree, int k);
+static void gen_bitlen(tree_desc * desc);
+static void gen_codes(ct_data * tree, int max_code);
+static void build_tree(tree_desc * desc);
+static void scan_tree(ct_data * tree, int max_code);
+static void send_tree(ct_data * tree, int max_code);
+static int build_bl_tree(void);
+static void send_all_trees(int lcodes, int dcodes, int blcodes);
+static void compress_block(ct_data * ltree, ct_data * dtree);
+static void set_file_type(void);
+
+
+#ifndef DEBUG
+#  define send_code(c, tree) send_bits(tree[c].Code, tree[c].Len)
+   /* Send a code of the given tree. c and tree must not have side effects */
+
+#else                                                   /* DEBUG */
+#  define send_code(c, tree) \
+     { if (verbose>1) bb_error_msg("\ncd %3d ",(c)); \
+       send_bits(tree[c].Code, tree[c].Len); }
+#endif
+
+#define d_code(dist) \
+   ((dist) < 256 ? dist_code[dist] : dist_code[256+((dist)>>7)])
+/* Mapping from a distance to a distance code. dist is the distance - 1 and
+ * must not have side effects. dist_code[256] and dist_code[257] are never
+ * used.
+ */
+
+/* the arguments must not have side effects */
+
+/* ===========================================================================
+ * Allocate the match buffer, initialize the various tables and save the
+ * location of the internal file attribute (ascii/binary) and method
+ * (DEFLATE/STORE).
+ */
+static void ct_init(ush * attr, int *methodp)
+{
+        int n;                          /* iterates over tree elements */
+        int bits;                       /* bit counter */
+        int length;                     /* length value */
+        int code;                       /* code value */
+        int dist;                       /* distance index */
+
+        file_type = attr;
+        file_method = methodp;
+        compressed_len = 0L;
+
+        if (static_dtree[0].Len != 0)
+                return;                 /* ct_init already called */
+
+        /* Initialize the mapping length (0..255) -> length code (0..28) */
+        length = 0;
+        for (code = 0; code < LENGTH_CODES - 1; code++) {
+                base_length[code] = length;
+                for (n = 0; n < (1 << extra_lbits[code]); n++) {
+                        length_code[length++] = (uch) code;
+                }
+        }
+        Assert(length == 256, "ct_init: length != 256");
+        /* Note that the length 255 (match length 258) can be represented
+         * in two different ways: code 284 + 5 bits or code 285, so we
+         * overwrite length_code[255] to use the best encoding:
+         */
+        length_code[length - 1] = (uch) code;
+
+        /* Initialize the mapping dist (0..32K) -> dist code (0..29) */
+        dist = 0;
+        for (code = 0; code < 16; code++) {
+                base_dist[code] = dist;
+                for (n = 0; n < (1 << extra_dbits[code]); n++) {
+                        dist_code[dist++] = (uch) code;
+                }
+        }
+        Assert(dist == 256, "ct_init: dist != 256");
+        dist >>= 7;                     /* from now on, all distances are divided by 128 */
+        for (; code < D_CODES; code++) {
+                base_dist[code] = dist << 7;
+                for (n = 0; n < (1 << (extra_dbits[code] - 7)); n++) {
+                        dist_code[256 + dist++] = (uch) code;
+                }
+        }
+        Assert(dist == 256, "ct_init: 256+dist != 512");
+
+        /* Construct the codes of the static literal tree */
+        for (bits = 0; bits <= MAX_BITS; bits++)
+                bl_count[bits] = 0;
+        n = 0;
+        while (n <= 143)
+                static_ltree[n++].Len = 8, bl_count[8]++;
+        while (n <= 255)
+                static_ltree[n++].Len = 9, bl_count[9]++;
+        while (n <= 279)
+                static_ltree[n++].Len = 7, bl_count[7]++;
+        while (n <= 287)
+                static_ltree[n++].Len = 8, bl_count[8]++;
+        /* Codes 286 and 287 do not exist, but we must include them in the
+         * tree construction to get a canonical Huffman tree (longest code
+         * all ones)
+         */
+        gen_codes((ct_data *) static_ltree, L_CODES + 1);
+
+        /* The static distance tree is trivial: */
+        for (n = 0; n < D_CODES; n++) {
+                static_dtree[n].Len = 5;
+                static_dtree[n].Code = bi_reverse(n, 5);
+        }
+
+        /* Initialize the first block of the first file: */
+        init_block();
+}
+
+/* ===========================================================================
+ * Initialize a new block.
+ */
+static void init_block(void)
+{
+        int n;                          /* iterates over tree elements */
+
+        /* Initialize the trees. */
+        for (n = 0; n < L_CODES; n++)
+                dyn_ltree[n].Freq = 0;
+        for (n = 0; n < D_CODES; n++)
+                dyn_dtree[n].Freq = 0;
+        for (n = 0; n < BL_CODES; n++)
+                bl_tree[n].Freq = 0;
+
+        dyn_ltree[END_BLOCK].Freq = 1;
+        opt_len = static_len = 0L;
+        last_lit = last_dist = last_flags = 0;
+        flags = 0;
+        flag_bit = 1;
+}
+
+#define SMALLEST 1
+/* Index within the heap array of least frequent node in the Huffman tree */
+
+
+/* ===========================================================================
+ * Remove the smallest element from the heap and recreate the heap with
+ * one less element. Updates heap and heap_len.
+ */
+#define pqremove(tree, top) \
+{\
+    top = heap[SMALLEST]; \
+    heap[SMALLEST] = heap[heap_len--]; \
+    pqdownheap(tree, SMALLEST); \
+}
+
+/* ===========================================================================
+ * Compares to subtrees, using the tree depth as tie breaker when
+ * the subtrees have equal frequency. This minimizes the worst case length.
+ */
+#define smaller(tree, n, m) \
+   (tree[n].Freq < tree[m].Freq || \
+   (tree[n].Freq == tree[m].Freq && depth[n] <= depth[m]))
+
+/* ===========================================================================
+ * Restore the heap property by moving down the tree starting at node k,
+ * exchanging a node with the smallest of its two sons if necessary, stopping
+ * when the heap property is re-established (each father smaller than its
+ * two sons).
+ */
+static void pqdownheap(ct_data * tree, int k)
+{
+        int v = heap[k];
+        int j = k << 1;         /* left son of k */
+
+        while (j <= heap_len) {
+                /* Set j to the smallest of the two sons: */
+                if (j < heap_len && smaller(tree, heap[j + 1], heap[j]))
+                        j++;
+
+                /* Exit if v is smaller than both sons */
+                if (smaller(tree, v, heap[j]))
+                        break;
+
+                /* Exchange v with the smallest son */
+                heap[k] = heap[j];
+                k = j;
+
+                /* And continue down the tree, setting j to the left son of k */
+                j <<= 1;
+        }
+        heap[k] = v;
+}
+
+/* ===========================================================================
+ * Compute the optimal bit lengths for a tree and update the total bit length
+ * for the current block.
+ * IN assertion: the fields freq and dad are set, heap[heap_max] and
+ *    above are the tree nodes sorted by increasing frequency.
+ * OUT assertions: the field len is set to the optimal bit length, the
+ *     array bl_count contains the frequencies for each bit length.
+ *     The length opt_len is updated; static_len is also updated if stree is
+ *     not null.
+ */
+static void gen_bitlen(tree_desc * desc)
+{
+        ct_data *tree = desc->dyn_tree;
+        const extra_bits_t *extra = desc->extra_bits;
+        int base = desc->extra_base;
+        int max_code = desc->max_code;
+        int max_length = desc->max_length;
+        ct_data *stree = desc->static_tree;
+        int h;                          /* heap index */
+        int n, m;                       /* iterate over the tree elements */
+        int bits;                       /* bit length */
+        int xbits;                      /* extra bits */
+        ush f;                          /* frequency */
+        int overflow = 0;       /* number of elements with bit length too large */
+
+        for (bits = 0; bits <= MAX_BITS; bits++)
+                bl_count[bits] = 0;
+
+        /* In a first pass, compute the optimal bit lengths (which may
+         * overflow in the case of the bit length tree).
+         */
+        tree[heap[heap_max]].Len = 0;   /* root of the heap */
+
+        for (h = heap_max + 1; h < HEAP_SIZE; h++) {
+                n = heap[h];
+                bits = tree[tree[n].Dad].Len + 1;
+                if (bits > max_length)
+                        bits = max_length, overflow++;
+                tree[n].Len = (ush) bits;
+                /* We overwrite tree[n].Dad which is no longer needed */
+
+                if (n > max_code)
+                        continue;       /* not a leaf node */
+
+                bl_count[bits]++;
+                xbits = 0;
+                if (n >= base)
+                        xbits = extra[n - base];
+                f = tree[n].Freq;
+                opt_len += (ulg) f *(bits + xbits);
+
+                if (stree)
+                        static_len += (ulg) f *(stree[n].Len + xbits);
+        }
+        if (overflow == 0)
+                return;
+
+        Trace((stderr, "\nbit length overflow\n"));
+        /* This happens for example on obj2 and pic of the Calgary corpus */
+
+        /* Find the first bit length which could increase: */
+        do {
+                bits = max_length - 1;
+                while (bl_count[bits] == 0)
+                        bits--;
+                bl_count[bits]--;       /* move one leaf down the tree */
+                bl_count[bits + 1] += 2;        /* move one overflow item as its brother */
+                bl_count[max_length]--;
+                /* The brother of the overflow item also moves one step up,
+                 * but this does not affect bl_count[max_length]
+                 */
+                overflow -= 2;
+        } while (overflow > 0);
+
+        /* Now recompute all bit lengths, scanning in increasing frequency.
+         * h is still equal to HEAP_SIZE. (It is simpler to reconstruct all
+         * lengths instead of fixing only the wrong ones. This idea is taken
+         * from 'ar' written by Haruhiko Okumura.)
+         */
+        for (bits = max_length; bits != 0; bits--) {
+                n = bl_count[bits];
+                while (n != 0) {
+                        m = heap[--h];
+                        if (m > max_code)
+                                continue;
+                        if (tree[m].Len != (unsigned) bits) {
+                                Trace((stderr, "code %d bits %d->%d\n", m, tree[m].Len,
+                                           bits));
+                                opt_len +=
+                                        ((long) bits - (long) tree[m].Len) * (long) tree[m].Freq;
+                                tree[m].Len = (ush) bits;
+                        }
+                        n--;
+                }
+        }
+}
+
+/* ===========================================================================
+ * Generate the codes for a given tree and bit counts (which need not be
+ * optimal).
+ * IN assertion: the array bl_count contains the bit length statistics for
+ * the given tree and the field len is set for all tree elements.
+ * OUT assertion: the field code is set for all tree elements of non
+ *     zero code length.
+ */
+static void gen_codes(ct_data * tree, int max_code)
+{
+        ush next_code[MAX_BITS + 1];    /* next code value for each bit length */
+        ush code = 0;           /* running code value */
+        int bits;                       /* bit index */
+        int n;                          /* code index */
+
+        /* The distribution counts are first used to generate the code values
+         * without bit reversal.
+         */
+        for (bits = 1; bits <= MAX_BITS; bits++) {
+                next_code[bits] = code = (code + bl_count[bits - 1]) << 1;
+        }
+        /* Check that the bit counts in bl_count are consistent. The last code
+         * must be all ones.
+         */
+        Assert(code + bl_count[MAX_BITS] - 1 == (1 << MAX_BITS) - 1,
+                   "inconsistent bit counts");
+        Tracev((stderr, "\ngen_codes: max_code %d ", max_code));
+
+        for (n = 0; n <= max_code; n++) {
+                int len = tree[n].Len;
+
+                if (len == 0)
+                        continue;
+                /* Now reverse the bits */
+                tree[n].Code = bi_reverse(next_code[len]++, len);
+
+                Tracec(tree != static_ltree,
+                           (stderr, "\nn %3d %c l %2d c %4x (%x) ", n,
+                                (isgraph(n) ? n : ' '), len, tree[n].Code,
+                                next_code[len] - 1));
+        }
+}
+
+/* ===========================================================================
+ * Construct one Huffman tree and assigns the code bit strings and lengths.
+ * Update the total bit length for the current block.
+ * IN assertion: the field freq is set for all tree elements.
+ * OUT assertions: the fields len and code are set to the optimal bit length
+ *     and corresponding code. The length opt_len is updated; static_len is
+ *     also updated if stree is not null. The field max_code is set.
+ */
+static void build_tree(tree_desc * desc)
+{
+        ct_data *tree = desc->dyn_tree;
+        ct_data *stree = desc->static_tree;
+        int elems = desc->elems;
+        int n, m;                       /* iterate over heap elements */
+        int max_code = -1;      /* largest code with non zero frequency */
+        int node = elems;       /* next internal node of the tree */
+
+        /* Construct the initial heap, with least frequent element in
+         * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
+         * heap[0] is not used.
+         */
+        heap_len = 0, heap_max = HEAP_SIZE;
+
+        for (n = 0; n < elems; n++) {
+                if (tree[n].Freq != 0) {
+                        heap[++heap_len] = max_code = n;
+                        depth[n] = 0;
+                } else {
+                        tree[n].Len = 0;
+                }
+        }
+
+        /* The pkzip format requires that at least one distance code exists,
+         * and that at least one bit should be sent even if there is only one
+         * possible code. So to avoid special checks later on we force at least
+         * two codes of non zero frequency.
+         */
+        while (heap_len < 2) {
+                int new = heap[++heap_len] = (max_code < 2 ? ++max_code : 0);
+
+                tree[new].Freq = 1;
+                depth[new] = 0;
+                opt_len--;
+                if (stree)
+                        static_len -= stree[new].Len;
+                /* new is 0 or 1 so it does not have extra bits */
+        }
+        desc->max_code = max_code;
+
+        /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
+         * establish sub-heaps of increasing lengths:
+         */
+        for (n = heap_len / 2; n >= 1; n--)
+                pqdownheap(tree, n);
+
+        /* Construct the Huffman tree by repeatedly combining the least two
+         * frequent nodes.
+         */
+        do {
+                pqremove(tree, n);      /* n = node of least frequency */
+                m = heap[SMALLEST];     /* m = node of next least frequency */
+
+                heap[--heap_max] = n;   /* keep the nodes sorted by frequency */
+                heap[--heap_max] = m;
+
+                /* Create a new node father of n and m */
+                tree[node].Freq = tree[n].Freq + tree[m].Freq;
+                depth[node] = (uch) (MAX(depth[n], depth[m]) + 1);
+                tree[n].Dad = tree[m].Dad = (ush) node;
+#ifdef DUMP_BL_TREE
+                if (tree == bl_tree) {
+                        bb_error_msg("\nnode %d(%d), sons %d(%d) %d(%d)",
+                                        node, tree[node].Freq, n, tree[n].Freq, m, tree[m].Freq);
+                }
+#endif
+                /* and insert the new node in the heap */
+                heap[SMALLEST] = node++;
+                pqdownheap(tree, SMALLEST);
+
+        } while (heap_len >= 2);
+
+        heap[--heap_max] = heap[SMALLEST];
+
+        /* At this point, the fields freq and dad are set. We can now
+         * generate the bit lengths.
+         */
+        gen_bitlen((tree_desc *) desc);
+
+        /* The field len is now set, we can generate the bit codes */
+        gen_codes((ct_data *) tree, max_code);
+}
+
+/* ===========================================================================
+ * Scan a literal or distance tree to determine the frequencies of the codes
+ * in the bit length tree. Updates opt_len to take into account the repeat
+ * counts. (The contribution of the bit length codes will be added later
+ * during the construction of bl_tree.)
+ */
+static void scan_tree(ct_data * tree, int max_code)
+{
+        int n;                          /* iterates over all tree elements */
+        int prevlen = -1;       /* last emitted length */
+        int curlen;                     /* length of current code */
+        int nextlen = tree[0].Len;      /* length of next code */
+        int count = 0;          /* repeat count of the current code */
+        int max_count = 7;      /* max repeat count */
+        int min_count = 4;      /* min repeat count */
+
+        if (nextlen == 0)
+                max_count = 138, min_count = 3;
+        tree[max_code + 1].Len = (ush) 0xffff;  /* guard */
+
+        for (n = 0; n <= max_code; n++) {
+                curlen = nextlen;
+                nextlen = tree[n + 1].Len;
+                if (++count < max_count && curlen == nextlen) {
+                        continue;
+                } else if (count < min_count) {
+                        bl_tree[curlen].Freq += count;
+                } else if (curlen != 0) {
+                        if (curlen != prevlen)
+                                bl_tree[curlen].Freq++;
+                        bl_tree[REP_3_6].Freq++;
+                } else if (count <= 10) {
+                        bl_tree[REPZ_3_10].Freq++;
+                } else {
+                        bl_tree[REPZ_11_138].Freq++;
+                }
+                count = 0;
+                prevlen = curlen;
+                if (nextlen == 0) {
+                        max_count = 138, min_count = 3;
+                } else if (curlen == nextlen) {
+                        max_count = 6, min_count = 3;
+                } else {
+                        max_count = 7, min_count = 4;
+                }
+        }
+}
+
+/* ===========================================================================
+ * Send a literal or distance tree in compressed form, using the codes in
+ * bl_tree.
+ */
+static void send_tree(ct_data * tree, int max_code)
+{
+        int n;                          /* iterates over all tree elements */
+        int prevlen = -1;       /* last emitted length */
+        int curlen;                     /* length of current code */
+        int nextlen = tree[0].Len;      /* length of next code */
+        int count = 0;          /* repeat count of the current code */
+        int max_count = 7;      /* max repeat count */
+        int min_count = 4;      /* min repeat count */
+
+/* tree[max_code+1].Len = -1; *//* guard already set */
+        if (nextlen == 0)
+                max_count = 138, min_count = 3;
+
+        for (n = 0; n <= max_code; n++) {
+                curlen = nextlen;
+                nextlen = tree[n + 1].Len;
+                if (++count < max_count && curlen == nextlen) {
+                        continue;
+                } else if (count < min_count) {
+                        do {
+                                send_code(curlen, bl_tree);
+                        } while (--count != 0);
+
+                } else if (curlen != 0) {
+                        if (curlen != prevlen) {
+                                send_code(curlen, bl_tree);
+                                count--;
+                        }
+                        Assert(count >= 3 && count <= 6, " 3_6?");
+                        send_code(REP_3_6, bl_tree);
+                        send_bits(count - 3, 2);
+
+                } else if (count <= 10) {
+                        send_code(REPZ_3_10, bl_tree);
+                        send_bits(count - 3, 3);
+
+                } else {
+                        send_code(REPZ_11_138, bl_tree);
+                        send_bits(count - 11, 7);
+                }
+                count = 0;
+                prevlen = curlen;
+                if (nextlen == 0) {
+                        max_count = 138, min_count = 3;
+                } else if (curlen == nextlen) {
+                        max_count = 6, min_count = 3;
+                } else {
+                        max_count = 7, min_count = 4;
+                }
+        }
+}
+
+/* ===========================================================================
+ * Construct the Huffman tree for the bit lengths and return the index in
+ * bl_order of the last bit length code to send.
+ */
+static int build_bl_tree(void)
+{
+        int max_blindex;        /* index of last bit length code of non zero freq */
+
+        /* Determine the bit length frequencies for literal and distance trees */
+        scan_tree((ct_data *) dyn_ltree, l_desc.max_code);
+        scan_tree((ct_data *) dyn_dtree, d_desc.max_code);
+
+        /* Build the bit length tree: */
+        build_tree((tree_desc *) (&bl_desc));
+        /* opt_len now includes the length of the tree representations, except
+         * the lengths of the bit lengths codes and the 5+5+4 bits for the counts.
+         */
+
+        /* Determine the number of bit length codes to send. The pkzip format
+         * requires that at least 4 bit length codes be sent. (appnote.txt says
+         * 3 but the actual value used is 4.)
+         */
+        for (max_blindex = BL_CODES - 1; max_blindex >= 3; max_blindex--) {
+                if (bl_tree[bl_order[max_blindex]].Len != 0)
+                        break;
+        }
+        /* Update opt_len to include the bit length tree and counts */
+        opt_len += 3 * (max_blindex + 1) + 5 + 5 + 4;
+        Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld", opt_len, static_len));
+
+        return max_blindex;
+}
+
+/* ===========================================================================
+ * Send the header for a block using dynamic Huffman trees: the counts, the
+ * lengths of the bit length codes, the literal tree and the distance tree.
+ * IN assertion: lcodes >= 257, dcodes >= 1, blcodes >= 4.
+ */
+static void send_all_trees(int lcodes, int dcodes, int blcodes)
+{
+        int rank;                       /* index in bl_order */
+
+        Assert(lcodes >= 257 && dcodes >= 1 && blcodes >= 4, "not enough codes");
+        Assert(lcodes <= L_CODES && dcodes <= D_CODES
+                   && blcodes <= BL_CODES, "too many codes");
+        Tracev((stderr, "\nbl counts: "));
+        send_bits(lcodes - 257, 5);     /* not +255 as stated in appnote.txt */
+        send_bits(dcodes - 1, 5);
+        send_bits(blcodes - 4, 4);      /* not -3 as stated in appnote.txt */
+        for (rank = 0; rank < blcodes; rank++) {
+                Tracev((stderr, "\nbl code %2d ", bl_order[rank]));
+                send_bits(bl_tree[bl_order[rank]].Len, 3);
+        }
+        Tracev((stderr, "\nbl tree: sent %ld", bits_sent));
+
+        send_tree((ct_data *) dyn_ltree, lcodes - 1);   /* send the literal tree */
+        Tracev((stderr, "\nlit tree: sent %ld", bits_sent));
+
+        send_tree((ct_data *) dyn_dtree, dcodes - 1);   /* send the distance tree */
+        Tracev((stderr, "\ndist tree: sent %ld", bits_sent));
+}
+
+/* ===========================================================================
+ * Determine the best encoding for the current block: dynamic trees, static
+ * trees or store, and output the encoded block to the zip file. This function
+ * returns the total compressed length for the file so far.
+ */
+static ulg flush_block(char *buf, ulg stored_len, int eof)
+{
+        ulg opt_lenb, static_lenb;      /* opt_len and static_len in bytes */
+        int max_blindex;        /* index of last bit length code of non zero freq */
+
+        flag_buf[last_flags] = flags;   /* Save the flags for the last 8 items */
+
+        /* Check if the file is ascii or binary */
+        if (*file_type == (ush) UNKNOWN)
+                set_file_type();
+
+        /* Construct the literal and distance trees */
+        build_tree((tree_desc *) (&l_desc));
+        Tracev((stderr, "\nlit data: dyn %ld, stat %ld", opt_len, static_len));
+
+        build_tree((tree_desc *) (&d_desc));
+        Tracev((stderr, "\ndist data: dyn %ld, stat %ld", opt_len, static_len));
+        /* At this point, opt_len and static_len are the total bit lengths of
+         * the compressed block data, excluding the tree representations.
+         */
+
+        /* Build the bit length tree for the above two trees, and get the index
+         * in bl_order of the last bit length code to send.
+         */
+        max_blindex = build_bl_tree();
+
+        /* Determine the best encoding. Compute first the block length in bytes */
+        opt_lenb = (opt_len + 3 + 7) >> 3;
+        static_lenb = (static_len + 3 + 7) >> 3;
+
+        Trace((stderr,
+                   "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u dist %u ",
+                   opt_lenb, opt_len, static_lenb, static_len, stored_len,
+                   last_lit, last_dist));
+
+        if (static_lenb <= opt_lenb)
+                opt_lenb = static_lenb;
+
+        /* If compression failed and this is the first and last block,
+         * and if the zip file can be seeked (to rewrite the local header),
+         * the whole file is transformed into a stored file:
+         */
+        if (stored_len <= opt_lenb && eof && compressed_len == 0L && seekable()) {
+                /* Since LIT_BUFSIZE <= 2*WSIZE, the input data must be there: */
+                if (buf == (char *) 0)
+                        bb_error_msg("block vanished");
+
+                copy_block(buf, (unsigned) stored_len, 0);      /* without header */
+                compressed_len = stored_len << 3;
+                *file_method = STORED;
+
+        } else if (stored_len + 4 <= opt_lenb && buf != (char *) 0) {
+                /* 4: two words for the lengths */
+                /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE.
+                 * Otherwise we can't have processed more than WSIZE input bytes since
+                 * the last block flush, because compression would have been
+                 * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
+                 * transform a block into a stored block.
+                 */
+                send_bits((STORED_BLOCK << 1) + eof, 3);        /* send block type */
+                compressed_len = (compressed_len + 3 + 7) & ~7L;
+                compressed_len += (stored_len + 4) << 3;
+
+                copy_block(buf, (unsigned) stored_len, 1);      /* with header */
+
+        } else if (static_lenb == opt_lenb) {
+                send_bits((STATIC_TREES << 1) + eof, 3);
+                compress_block((ct_data *) static_ltree, (ct_data *) static_dtree);
+                compressed_len += 3 + static_len;
+        } else {
+                send_bits((DYN_TREES << 1) + eof, 3);
+                send_all_trees(l_desc.max_code + 1, d_desc.max_code + 1,
+                                           max_blindex + 1);
+                compress_block((ct_data *) dyn_ltree, (ct_data *) dyn_dtree);
+                compressed_len += 3 + opt_len;
+        }
+        Assert(compressed_len == bits_sent, "bad compressed size");
+        init_block();
+
+        if (eof) {
+                bi_windup();
+                compressed_len += 7;    /* align on byte boundary */
+        }
+        Tracev((stderr, "\ncomprlen %lu(%lu) ", compressed_len >> 3,
+                        compressed_len - 7 * eof));
+
+        return compressed_len >> 3;
+}
+
+/* ===========================================================================
+ * Save the match info and tally the frequency counts. Return true if
+ * the current block must be flushed.
+ */
+static int ct_tally(int dist, int lc)
+{
+        l_buf[last_lit++] = (uch) lc;
+        if (dist == 0) {
+                /* lc is the unmatched char */
+                dyn_ltree[lc].Freq++;
+        } else {
+                /* Here, lc is the match length - MIN_MATCH */
+                dist--;                 /* dist = match distance - 1 */
+                Assert((ush) dist < (ush) MAX_DIST &&
+                           (ush) lc <= (ush) (MAX_MATCH - MIN_MATCH) &&
+                           (ush) d_code(dist) < (ush) D_CODES, "ct_tally: bad match");
+
+                dyn_ltree[length_code[lc] + LITERALS + 1].Freq++;
+                dyn_dtree[d_code(dist)].Freq++;
+
+                d_buf[last_dist++] = (ush) dist;
+                flags |= flag_bit;
+        }
+        flag_bit <<= 1;
+
+        /* Output the flags if they fill a byte: */
+        if ((last_lit & 7) == 0) {
+                flag_buf[last_flags++] = flags;
+                flags = 0, flag_bit = 1;
+        }
+        /* Try to guess if it is profitable to stop the current block here */
+        if ((last_lit & 0xfff) == 0) {
+                /* Compute an upper bound for the compressed length */
+                ulg out_length = (ulg) last_lit * 8L;
+                ulg in_length = (ulg) strstart - block_start;
+                int dcode;
+
+                for (dcode = 0; dcode < D_CODES; dcode++) {
+                        out_length +=
+                                (ulg) dyn_dtree[dcode].Freq * (5L + extra_dbits[dcode]);
+                }
+                out_length >>= 3;
+                Trace((stderr,
+                           "\nlast_lit %u, last_dist %u, in %ld, out ~%ld(%ld%%) ",
+                           last_lit, last_dist, in_length, out_length,
+                           100L - out_length * 100L / in_length));
+                if (last_dist < last_lit / 2 && out_length < in_length / 2)
+                        return 1;
+        }
+        return (last_lit == LIT_BUFSIZE - 1 || last_dist == DIST_BUFSIZE);
+        /* We avoid equality with LIT_BUFSIZE because of wraparound at 64K
+         * on 16 bit machines and because stored blocks are restricted to
+         * 64K-1 bytes.
+         */
+}
+
+/* ===========================================================================
+ * Send the block data compressed using the given Huffman trees
+ */
+static void compress_block(ct_data * ltree, ct_data * dtree)
+{
+        unsigned dist;          /* distance of matched string */
+        int lc;                         /* match length or unmatched char (if dist == 0) */
+        unsigned lx = 0;        /* running index in l_buf */
+        unsigned dx = 0;        /* running index in d_buf */
+        unsigned fx = 0;        /* running index in flag_buf */
+        uch flag = 0;           /* current flags */
+        unsigned code;          /* the code to send */
+        int extra;                      /* number of extra bits to send */
+
+        if (last_lit != 0)
+                do {
+                        if ((lx & 7) == 0)
+                                flag = flag_buf[fx++];
+                        lc = l_buf[lx++];
+                        if ((flag & 1) == 0) {
+                                send_code(lc, ltree);   /* send a literal byte */
+                                Tracecv(isgraph(lc), (stderr, " '%c' ", lc));
+                        } else {
+                                /* Here, lc is the match length - MIN_MATCH */
+                                code = length_code[lc];
+                                send_code(code + LITERALS + 1, ltree);  /* send the length code */
+                                extra = extra_lbits[code];
+                                if (extra != 0) {
+                                        lc -= base_length[code];
+                                        send_bits(lc, extra);   /* send the extra length bits */
+                                }
+                                dist = d_buf[dx++];
+                                /* Here, dist is the match distance - 1 */
+                                code = d_code(dist);
+                                Assert(code < D_CODES, "bad d_code");
+
+                                send_code(code, dtree); /* send the distance code */
+                                extra = extra_dbits[code];
+                                if (extra != 0) {
+                                        dist -= base_dist[code];
+                                        send_bits(dist, extra); /* send the extra distance bits */
+                                }
+                        }                       /* literal or match pair ? */
+                        flag >>= 1;
+                } while (lx < last_lit);
+
+        send_code(END_BLOCK, ltree);
+}
+
+/* ===========================================================================
+ * Set the file type to ASCII or BINARY, using a crude approximation:
+ * binary if more than 20% of the bytes are <= 6 or >= 128, ascii otherwise.
+ * IN assertion: the fields freq of dyn_ltree are set and the total of all
+ * frequencies does not exceed 64K (to fit in an int on 16 bit machines).
+ */
+static void set_file_type(void)
+{
+        int n = 0;
+        unsigned ascii_freq = 0;
+        unsigned bin_freq = 0;
+
+        while (n < 7)
+                bin_freq += dyn_ltree[n++].Freq;
+        while (n < 128)
+                ascii_freq += dyn_ltree[n++].Freq;
+        while (n < LITERALS)
+                bin_freq += dyn_ltree[n++].Freq;
+        *file_type = bin_freq > (ascii_freq >> 2) ? BINARY : ASCII;
+        if (*file_type == BINARY && translate_eol) {
+                bb_error_msg("-l used on binary file");
+        }
+}
+
+/* zip.c -- compress files to the gzip or pkzip format
+ * Copyright (C) 1992-1993 Jean-loup Gailly
+ * This is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License, see the file COPYING.
+ */
+
+
+static uint32_t crc;                    /* crc on uncompressed file data */
+static long header_bytes;       /* number of bytes in gzip header */
+
+static void put_long(ulg n)
+{
+        put_short((n) & 0xffff);
+        put_short(((ulg) (n)) >> 16);
+}
+
+/* put_header_byte is used for the compressed output
+ * - for the initial 4 bytes that can't overflow the buffer.
+ */
+#define put_header_byte(c) {outbuf[outcnt++]=(uch)(c);}
+
+/* ===========================================================================
+ * Deflate in to out.
+ * IN assertions: the input and output buffers are cleared.
+ *   The variables time_stamp and save_orig_name are initialized.
+ */
+static int zip(int in, int out)
+{
+        uch my_flags = 0;       /* general purpose bit flags */
+        ush attr = 0;           /* ascii/binary flag */
+        ush deflate_flags = 0;  /* pkzip -es, -en or -ex equivalent */
+
+        ifd = in;
+        ofd = out;
+        outcnt = 0;
+
+        /* Write the header to the gzip file. See algorithm.doc for the format */
+
+        method = DEFLATED;
+        put_header_byte(GZIP_MAGIC[0]); /* magic header */
+        put_header_byte(GZIP_MAGIC[1]);
+        put_header_byte(DEFLATED);      /* compression method */
+
+        put_header_byte(my_flags);      /* general flags */
+        put_long(time_stamp);
+
+        /* Write deflated file to zip file */
+        crc = updcrc(0, 0);
+
+        bi_init(out);
+        ct_init(&attr, &method);
+        lm_init(&deflate_flags);
+
+        put_byte((uch) deflate_flags);  /* extra flags */
+        put_byte(OS_CODE);      /* OS identifier */
+
+        header_bytes = (long) outcnt;
+
+        (void) deflate();
+
+        /* Write the crc and uncompressed size */
+        put_long(crc);
+        put_long(isize);
+        header_bytes += 2 * sizeof(long);
+
+        flush_outbuf();
+        return OK;
+}
+
+
+/* ===========================================================================
+ * Read a new buffer from the current input file, perform end-of-line
+ * translation, and update the crc and input file size.
+ * IN assertion: size >= 2 (for end-of-line translation)
+ */
+static int file_read(char *buf, unsigned size)
+{
+        unsigned len;
+
+        Assert(insize == 0, "inbuf not empty");
+
+        len = read(ifd, buf, size);
+        if (len == (unsigned) (-1) || len == 0)
+                return (int) len;
+
+        crc = updcrc((uch *) buf, len);
+        isize += (ulg) len;
+        return (int) len;
+}
+
+/* ===========================================================================
+ * Write the output buffer outbuf[0..outcnt-1] and update bytes_out.
+ * (used for the compressed data only)
+ */
+static void flush_outbuf(void)
+{
+        if (outcnt == 0)
+                return;
+
+        write_buf(ofd, (char *) outbuf, outcnt);
+        outcnt = 0;
+}