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authorEric Andersen1999-10-05 16:24:54 +0000
committerEric Andersen1999-10-05 16:24:54 +0000
commitcc8ed39b240180b58810784f844e253263594ac3 (patch)
tree15feebbb4be9a9168209609f48f0b100f9364420 /gzip.c
downloadbusybox-cc8ed39b240180b58810784f844e253263594ac3.zip
busybox-cc8ed39b240180b58810784f844e253263594ac3.tar.gz
Initial revision0_29alpha2
Diffstat (limited to 'gzip.c')
-rw-r--r--gzip.c3231
1 files changed, 3231 insertions, 0 deletions
diff --git a/gzip.c b/gzip.c
new file mode 100644
index 0000000..6fd2e39
--- /dev/null
+++ b/gzip.c
@@ -0,0 +1,3231 @@
+/* gzip.c -- 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.
+ *
+ * Charles P. Wright <cpw@unix.asb.com>
+ */
+#include "internal.h"
+#ifdef BB_GZIP
+
+#ifndef BB_ZCAT
+error: you need zcat to have gzip support!
+#endif
+
+const char gzip_usage[] = "gzip\nignores all command line arguments\ncompress stdin to stdout with -9 compression\n";
+
+/* gzip.h -- common declarations for all gzip modules
+ * 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.
+ */
+
+#if defined(__STDC__) || defined(PROTO)
+# define OF(args) args
+#else
+# define OF(args) ()
+#endif
+
+#ifdef __STDC__
+ typedef void *voidp;
+#else
+ typedef char *voidp;
+#endif
+
+/* I don't like nested includes, but the string and io functions are used
+ * too often
+ */
+#include <stdio.h>
+#if !defined(NO_STRING_H) || defined(STDC_HEADERS)
+# include <string.h>
+# if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H) && !defined(__GNUC__)
+# include <memory.h>
+# endif
+# define memzero(s, n) memset ((voidp)(s), 0, (n))
+#else
+# include <strings.h>
+# define strchr index
+# define strrchr rindex
+# define memcpy(d, s, n) bcopy((s), (d), (n))
+# define memcmp(s1, s2, n) bcmp((s1), (s2), (n))
+# define memzero(s, n) bzero((s), (n))
+#endif
+
+#ifndef RETSIGTYPE
+# define RETSIGTYPE void
+#endif
+
+#define local static
+
+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) */
+#define STORED 0
+#define COMPRESSED 1
+#define PACKED 2
+#define LZHED 3
+/* methods 4 to 7 reserved */
+#define DEFLATED 8
+#define MAX_METHODS 9
+extern int method; /* compression method */
+
+/* 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
+ * inflate: window inbuf
+ * unpack: window inbuf prefix_len
+ * unlzh: left+right window c_table inbuf c_len
+ * 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
+
+#ifdef DYN_ALLOC
+# define EXTERN(type, array) extern type * near array
+# define DECLARE(type, array, size) type * near array
+# define ALLOC(type, array, size) { \
+ array = (type*)fcalloc((size_t)(((size)+1L)/2), 2*sizeof(type)); \
+ if (array == NULL) error("insufficient memory"); \
+ }
+# define FREE(array) {if (array != NULL) fcfree(array), array=NULL;}
+#else
+# define EXTERN(type, array) extern type array[]
+# define DECLARE(type, array, size) type array[size]
+# define ALLOC(type, array, size)
+# define FREE(array)
+#endif
+
+EXTERN(uch, inbuf); /* input buffer */
+EXTERN(uch, outbuf); /* output buffer */
+EXTERN(ush, d_buf); /* buffer for distances, see trees.c */
+EXTERN(uch, window); /* Sliding window and suffix table (unlzw) */
+#define tab_suffix window
+#ifndef MAXSEG_64K
+# define tab_prefix prev /* hash link (see deflate.c) */
+# define head (prev+WSIZE) /* hash head (see deflate.c) */
+ EXTERN(ush, tab_prefix); /* prefix code (see unlzw.c) */
+#else
+# define tab_prefix0 prev
+# define head tab_prefix1
+ EXTERN(ush, tab_prefix0); /* prefix for even codes */
+ EXTERN(ush, tab_prefix1); /* prefix for odd codes */
+#endif
+
+extern unsigned insize; /* valid bytes in inbuf */
+extern unsigned inptr; /* index of next byte to be processed in inbuf */
+extern unsigned outcnt; /* bytes in output buffer */
+
+extern long bytes_in; /* number of input bytes */
+extern long bytes_out; /* number of output bytes */
+extern long header_bytes;/* number of bytes in gzip header */
+
+#define isize bytes_in
+/* for compatibility with old zip sources (to be cleaned) */
+
+extern int ifd; /* input file descriptor */
+extern int ofd; /* output file descriptor */
+extern char ifname[]; /* input file name or "stdin" */
+extern char ofname[]; /* output file name or "stdout" */
+extern char *progname; /* program name */
+
+extern long time_stamp; /* original time stamp (modification time) */
+extern long ifile_size; /* input file size, -1 for devices (debug only) */
+
+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 ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
+#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.
+ */
+
+extern int decrypt; /* flag to turn on decryption */
+extern int exit_code; /* program exit code */
+extern int verbose; /* be verbose (-v) */
+extern int quiet; /* be quiet (-q) */
+extern int test; /* check .z file integrity */
+extern int to_stdout; /* output to stdout (-c) */
+extern int save_orig_name; /* set if original name must be saved */
+
+#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(0))
+#define try_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(1))
+
+/* put_byte is used for the compressed output, put_ubyte for the
+ * uncompressed output. However unlzw() uses window for its
+ * suffix table instead of its output buffer, so it does not use put_ubyte
+ * (to be cleaned up).
+ */
+#define put_byte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==OUTBUFSIZ)\
+ flush_outbuf();}
+#define put_ubyte(c) {window[outcnt++]=(uch)(c); if (outcnt==WSIZE)\
+ flush_window();}
+
+/* Output a 16 bit value, lsb first */
+#define put_short(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)); \
+ } \
+}
+
+/* Output a 32 bit value to the bit stream, lsb first */
+#define put_long(n) { \
+ put_short((n) & 0xffff); \
+ put_short(((ulg)(n)) >> 16); \
+}
+
+#define seekable() 0 /* force sequential output */
+#define translate_eol 0 /* no option -a yet */
+
+#define tolow(c) (isupper(c) ? (c)-'A'+'a' : (c)) /* force to lower case */
+
+/* Macros for getting two-byte and four-byte header values */
+#define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
+#define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
+
+/* Diagnostic functions */
+#ifdef DEBUG
+# define Assert(cond,msg) {if(!(cond)) error(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;}
+
+local void do_exit(int exitcode);
+
+ /* in zip.c: */
+extern int zip OF((int in, int out));
+extern int file_read OF((char *buf, unsigned size));
+
+ /* in unzip.c */
+extern int unzip OF((int in, int out));
+extern int check_zipfile OF((int in));
+
+ /* in unpack.c */
+extern int unpack OF((int in, int out));
+
+ /* in unlzh.c */
+extern int unlzh OF((int in, int out));
+
+ /* in gzip.c */
+RETSIGTYPE abort_gzip OF((void));
+
+ /* in deflate.c */
+void lm_init OF((ush *flags));
+ulg deflate OF((void));
+
+ /* in trees.c */
+void ct_init OF((ush *attr, int *method));
+int ct_tally OF((int dist, int lc));
+ulg flush_block OF((char *buf, ulg stored_len, int eof));
+
+ /* in bits.c */
+void bi_init OF((file_t zipfile));
+void send_bits OF((int value, int length));
+unsigned bi_reverse OF((unsigned value, int length));
+void bi_windup OF((void));
+void copy_block OF((char *buf, unsigned len, int header));
+extern int (*read_buf) OF((char *buf, unsigned size));
+
+ /* in util.c: */
+extern int copy OF((int in, int out));
+extern ulg updcrc OF((uch *s, unsigned n));
+extern void clear_bufs OF((void));
+extern int fill_inbuf OF((int eof_ok));
+extern void flush_outbuf OF((void));
+extern void flush_window OF((void));
+extern void write_buf OF((int fd, voidp buf, unsigned cnt));
+extern char *strlwr OF((char *s));
+extern char *add_envopt OF((int *argcp, char ***argvp, char *env));
+extern void error OF((char *m));
+extern void warn OF((char *a, char *b));
+extern void read_error OF((void));
+extern void write_error OF((void));
+extern void display_ratio OF((long num, long den, FILE *file));
+extern voidp xmalloc OF((unsigned int size));
+
+ /* in inflate.c */
+extern int inflate OF((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.
+ */
+
+#if !defined(OF) && defined(lint)
+# include "gzip.h"
+#endif
+
+#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".
+ */
+
+#define BLOCK_MODE 0x80
+/* Block compression: if table is full and compression rate is dropping,
+ * clear the dictionary.
+ */
+
+#define LZW_RESERVED 0x60 /* reserved bits */
+
+#define CLEAR 256 /* flush the dictionary */
+#define FIRST (CLEAR+1) /* first free entry */
+
+extern int maxbits; /* max bits per code for LZW */
+extern int block_mode; /* block compress mode -C compatible with 2.0 */
+
+/* revision.h -- define the version number
+ * 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.
+ */
+
+#define VERSION "1.2.4"
+#define PATCHLEVEL 0
+#define REVDATE "18 Aug 93"
+
+/* This version does not support compression into old compress format: */
+#ifdef LZW
+# undef LZW
+#endif
+
+/* $Id: gzip.c,v 1.1 1999/10/05 16:24:56 andersen Exp $ */
+/* 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.
+ */
+
+/* $Id: gzip.c,v 1.1 1999/10/05 16:24:56 andersen Exp $ */
+
+#if defined(__MSDOS__) && !defined(MSDOS)
+# define MSDOS
+#endif
+
+#if defined(__OS2__) && !defined(OS2)
+# define OS2
+#endif
+
+#if defined(OS2) && defined(MSDOS) /* MS C under OS/2 */
+# undef MSDOS
+#endif
+
+#ifdef MSDOS
+# ifdef __GNUC__
+ /* DJGPP version 1.09+ on MS-DOS.
+ * The DJGPP 1.09 stat() function must be upgraded before gzip will
+ * fully work.
+ * No need for DIRENT, since <unistd.h> defines POSIX_SOURCE which
+ * implies DIRENT.
+ */
+# define near
+# else
+# define MAXSEG_64K
+# ifdef __TURBOC__
+# define NO_OFF_T
+# ifdef __BORLANDC__
+# define DIRENT
+# else
+# define NO_UTIME
+# endif
+# else /* MSC */
+# define HAVE_SYS_UTIME_H
+# define NO_UTIME_H
+# endif
+# endif
+# define PATH_SEP2 '\\'
+# define PATH_SEP3 ':'
+# define MAX_PATH_LEN 128
+# define NO_MULTIPLE_DOTS
+# define MAX_EXT_CHARS 3
+# define Z_SUFFIX "z"
+# define NO_CHOWN
+# define PROTO
+# define STDC_HEADERS
+# define NO_SIZE_CHECK
+# define casemap(c) tolow(c) /* Force file names to lower case */
+# include <io.h>
+# define OS_CODE 0x00
+# define SET_BINARY_MODE(fd) setmode(fd, O_BINARY)
+# if !defined(NO_ASM) && !defined(ASMV)
+# define ASMV
+# endif
+#else
+# define near
+#endif
+
+#ifdef OS2
+# define PATH_SEP2 '\\'
+# define PATH_SEP3 ':'
+# define MAX_PATH_LEN 260
+# ifdef OS2FAT
+# define NO_MULTIPLE_DOTS
+# define MAX_EXT_CHARS 3
+# define Z_SUFFIX "z"
+# define casemap(c) tolow(c)
+# endif
+# define NO_CHOWN
+# define PROTO
+# define STDC_HEADERS
+# include <io.h>
+# define OS_CODE 0x06
+# define SET_BINARY_MODE(fd) setmode(fd, O_BINARY)
+# ifdef _MSC_VER
+# define HAVE_SYS_UTIME_H
+# define NO_UTIME_H
+# define MAXSEG_64K
+# undef near
+# define near _near
+# endif
+# ifdef __EMX__
+# define HAVE_SYS_UTIME_H
+# define NO_UTIME_H
+# define DIRENT
+# define EXPAND(argc,argv) \
+ {_response(&argc, &argv); _wildcard(&argc, &argv);}
+# endif
+# ifdef __BORLANDC__
+# define DIRENT
+# endif
+# ifdef __ZTC__
+# define NO_DIR
+# define NO_UTIME_H
+# include <dos.h>
+# define EXPAND(argc,argv) \
+ {response_expand(&argc, &argv);}
+# endif
+#endif
+
+#ifdef WIN32 /* Windows NT */
+# define HAVE_SYS_UTIME_H
+# define NO_UTIME_H
+# define PATH_SEP2 '\\'
+# define PATH_SEP3 ':'
+# define MAX_PATH_LEN 260
+# define NO_CHOWN
+# define PROTO
+# define STDC_HEADERS
+# define SET_BINARY_MODE(fd) setmode(fd, O_BINARY)
+# include <io.h>
+# include <malloc.h>
+# ifdef NTFAT
+# define NO_MULTIPLE_DOTS
+# define MAX_EXT_CHARS 3
+# define Z_SUFFIX "z"
+# define casemap(c) tolow(c) /* Force file names to lower case */
+# endif
+# define OS_CODE 0x0b
+#endif
+
+#ifdef MSDOS
+# ifdef __TURBOC__
+# include <alloc.h>
+# define DYN_ALLOC
+ /* Turbo C 2.0 does not accept static allocations of large arrays */
+ void * fcalloc (unsigned items, unsigned size);
+ void fcfree (void *ptr);
+# else /* MSC */
+# include <malloc.h>
+# define fcalloc(nitems,itemsize) halloc((long)(nitems),(itemsize))
+# define fcfree(ptr) hfree(ptr)
+# endif
+#else
+# ifdef MAXSEG_64K
+# define fcalloc(items,size) calloc((items),(size))
+# else
+# define fcalloc(items,size) malloc((size_t)(items)*(size_t)(size))
+# endif
+# define fcfree(ptr) free(ptr)
+#endif
+
+#if defined(VAXC) || defined(VMS)
+# define PATH_SEP ']'
+# define PATH_SEP2 ':'
+# define SUFFIX_SEP ';'
+# define NO_MULTIPLE_DOTS
+# define Z_SUFFIX "-gz"
+# define RECORD_IO 1
+# define casemap(c) tolow(c)
+# define OS_CODE 0x02
+# define OPTIONS_VAR "GZIP_OPT"
+# define STDC_HEADERS
+# define NO_UTIME
+# define EXPAND(argc,argv) vms_expand_args(&argc,&argv);
+# include <file.h>
+# define unlink delete
+# ifdef VAXC
+# define NO_FCNTL_H
+# include <unixio.h>
+# endif
+#endif
+
+#ifdef AMIGA
+# define PATH_SEP2 ':'
+# define STDC_HEADERS
+# define OS_CODE 0x01
+# define ASMV
+# ifdef __GNUC__
+# define DIRENT
+# define HAVE_UNISTD_H
+# else /* SASC */
+# define NO_STDIN_FSTAT
+# define SYSDIR
+# define NO_SYMLINK
+# define NO_CHOWN
+# define NO_FCNTL_H
+# include <fcntl.h> /* for read() and write() */
+# define direct dirent
+ extern void _expand_args(int *argc, char ***argv);
+# define EXPAND(argc,argv) _expand_args(&argc,&argv);
+# undef O_BINARY /* disable useless --ascii option */
+# endif
+#endif
+
+#if defined(ATARI) || defined(atarist)
+# ifndef STDC_HEADERS
+# define STDC_HEADERS
+# define HAVE_UNISTD_H
+# define DIRENT
+# endif
+# define ASMV
+# define OS_CODE 0x05
+# ifdef TOSFS
+# define PATH_SEP2 '\\'
+# define PATH_SEP3 ':'
+# define MAX_PATH_LEN 128
+# define NO_MULTIPLE_DOTS
+# define MAX_EXT_CHARS 3
+# define Z_SUFFIX "z"
+# define NO_CHOWN
+# define casemap(c) tolow(c) /* Force file names to lower case */
+# define NO_SYMLINK
+# endif
+#endif
+
+#ifdef MACOS
+# define PATH_SEP ':'
+# define DYN_ALLOC
+# define PROTO
+# define NO_STDIN_FSTAT
+# define NO_CHOWN
+# define NO_UTIME
+# define chmod(file, mode) (0)
+# define OPEN(name, flags, mode) open(name, flags)
+# define OS_CODE 0x07
+# ifdef MPW
+# define isatty(fd) ((fd) <= 2)
+# endif
+#endif
+
+#ifdef __50SERIES /* Prime/PRIMOS */
+# define PATH_SEP '>'
+# define STDC_HEADERS
+# define NO_MEMORY_H
+# define NO_UTIME_H
+# define NO_UTIME
+# define NO_CHOWN
+# define NO_STDIN_FSTAT
+# define NO_SIZE_CHECK
+# define NO_SYMLINK
+# define RECORD_IO 1
+# define casemap(c) tolow(c) /* Force file names to lower case */
+# define put_char(c) put_byte((c) & 0x7F)
+# define get_char(c) ascii2pascii(get_byte())
+# define OS_CODE 0x0F /* temporary, subject to change */
+# ifdef SIGTERM
+# undef SIGTERM /* We don't want a signal handler for SIGTERM */
+# endif
+#endif
+
+#if defined(pyr) && !defined(NOMEMCPY) /* Pyramid */
+# define NOMEMCPY /* problem with overlapping copies */
+#endif
+
+#ifdef TOPS20
+# define OS_CODE 0x0a
+#endif
+
+#ifndef unix
+# define NO_ST_INO /* don't rely on inode numbers */
+#endif
+
+
+ /* Common defaults */
+
+#ifndef OS_CODE
+# define OS_CODE 0x03 /* assume Unix */
+#endif
+
+#ifndef PATH_SEP
+# define PATH_SEP '/'
+#endif
+
+#ifndef casemap
+# define casemap(c) (c)
+#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
+
+#ifndef MAKE_LEGAL_NAME
+# ifdef NO_MULTIPLE_DOTS
+# define MAKE_LEGAL_NAME(name) make_simple_name(name)
+# else
+# define MAKE_LEGAL_NAME(name)
+# endif
+#endif
+
+#ifndef MIN_PART
+# define MIN_PART 3
+ /* keep at least MIN_PART chars between dots in a file name. */
+#endif
+
+#ifndef EXPAND
+# define EXPAND(argc,argv)
+#endif
+
+#ifndef RECORD_IO
+# define RECORD_IO 0
+#endif
+
+#ifndef SET_BINARY_MODE
+# define SET_BINARY_MODE(fd)
+#endif
+
+#ifndef OPEN
+# define OPEN(name, flags, mode) open(name, flags, mode)
+#endif
+
+#ifndef get_char
+# define get_char() get_byte()
+#endif
+
+#ifndef put_char
+# define put_char(c) put_byte(c)
+#endif
+/* 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.
+ *
+ */
+
+#ifdef DEBUG
+# include <stdio.h>
+#endif
+
+#ifdef RCSID
+static char rcsid[] = "$Id: gzip.c,v 1.1 1999/10/05 16:24:56 andersen Exp $";
+#endif
+
+/* ===========================================================================
+ * Local data used by the "bit string" routines.
+ */
+
+local file_t zfile; /* output gzip file */
+
+local 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.)
+ */
+
+local int bi_valid;
+/* Number of valid bits in bi_buf. All bits above the last valid bit
+ * are always zero.
+ */
+
+int (*read_buf) OF((char *buf, unsigned size));
+/* 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.
+ */
+void bi_init (zipfile)
+ file_t zipfile; /* output zip file, NO_FILE for in-memory compression */
+{
+ 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.
+ */
+void send_bits(value, length)
+ int value; /* value to send */
+ int length; /* number of bits */
+{
+#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
+ */
+unsigned bi_reverse(code, len)
+ unsigned code; /* the value to invert */
+ int len; /* its bit length */
+{
+ register 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.
+ */
+void bi_windup()
+{
+ 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.
+ */
+void copy_block(buf, len, header)
+ char *buf; /* the input data */
+ unsigned len; /* its length */
+ int header; /* true if block header must be written */
+{
+ 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--) {
+#ifdef CRYPT
+ int t;
+ if (key) zencode(*buf, t);
+#endif
+ 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.
+ *
+ * ACKNOWLEDGEMENTS
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+
+#ifdef RCSID
+static char rcsid[] = "$Id: gzip.c,v 1.1 1999/10/05 16:24:56 andersen Exp $";
+#endif
+
+/* ===========================================================================
+ * 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. */
+
+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.
+ */
+
+long block_start;
+/* window position at the beginning of the current output block. Gets
+ * negative when the window is moved backwards.
+ */
+
+local 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
+ */
+
+unsigned int near 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.
+ */
+
+ unsigned near strstart; /* start of string to insert */
+ unsigned near match_start; /* start of matching string */
+local int eofile; /* flag set at end of input file */
+local unsigned lookahead; /* number of valid bytes ahead in window */
+
+unsigned near max_chain_length;
+/* To speed up deflation, hash chains are never searched beyond this length.
+ * A higher limit improves compression ratio but degrades the speed.
+ */
+
+local unsigned int max_lazy_match;
+/* 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.
+ */
+#define 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.
+ */
+
+unsigned near good_match;
+/* 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.
+ */
+
+typedef struct config {
+ ush good_length; /* reduce lazy search above this match length */
+ ush max_lazy; /* do not perform lazy search above this match length */
+ ush nice_length; /* quit search above this match length */
+ ush max_chain;
+} config;
+
+#ifdef FULL_SEARCH
+# define nice_match MAX_MATCH
+#else
+ int near nice_match; /* Stop searching when current match exceeds this */
+#endif
+
+local config configuration_table =
+/* 9 */ {32, 258, 258, 4096}; /* maximum compression */
+
+/* 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.
+ */
+local void fill_window OF((void));
+
+ int longest_match OF((IPos cur_match));
+#ifdef ASMV
+ void match_init OF((void)); /* asm code initialization */
+#endif
+
+#ifdef DEBUG
+local void check_match OF((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
+ */
+void lm_init (flags)
+ ush *flags; /* general purpose bit flag */
+{
+ register unsigned j;
+
+ /* Initialize the hash table. */
+#if defined(MAXSEG_64K) && HASH_BITS == 15
+ for (j = 0; j < HASH_SIZE; j++) head[j] = NIL;
+#else
+ memzero((char*)head, HASH_SIZE*sizeof(*head));
+#endif
+ /* prev will be initialized on the fly */
+
+ /* Set the default configuration parameters:
+ */
+ max_lazy_match = configuration_table.max_lazy;
+ good_match = configuration_table.good_length;
+#ifndef FULL_SEARCH
+ nice_match = configuration_table.nice_length;
+#endif
+ max_chain_length = configuration_table.max_chain;
+ *flags |= SLOW;
+ /* ??? reduce max_chain_length for binary files */
+
+ strstart = 0;
+ block_start = 0L;
+#ifdef ASMV
+ match_init(); /* initialize the asm code */
+#endif
+
+ 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
+ */
+#ifndef ASMV
+/* 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.
+ */
+int longest_match(cur_match)
+ IPos cur_match; /* current match */
+{
+ unsigned chain_length = max_chain_length; /* max hash chain length */
+ register uch *scan = window + strstart; /* current string */
+ register uch *match; /* matched string */
+ register 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
+
+#ifdef UNALIGNED_OK
+ /* Compare two bytes at a time. Note: this is not always beneficial.
+ * Try with and without -DUNALIGNED_OK to check.
+ */
+ register uch *strend = window + strstart + MAX_MATCH - 1;
+ register ush scan_start = *(ush*)scan;
+ register ush scan_end = *(ush*)(scan+best_len-1);
+#else
+ register uch *strend = window + strstart + MAX_MATCH;
+ register uch scan_end1 = scan[best_len-1];
+ register uch scan_end = scan[best_len];
+#endif
+
+ /* 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 (defined(UNALIGNED_OK) && MAX_MATCH == 258)
+ /* This code assumes sizeof(unsigned short) == 2. Do not use
+ * UNALIGNED_OK if your compiler uses a different size.
+ */
+ if (*(ush*)(match+best_len-1) != scan_end ||
+ *(ush*)match != scan_start) continue;
+
+ /* 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. Compare 2 bytes at a time at
+ * strstart+3, +5, ... up to strstart+257. We check for insufficient
+ * lookahead only every 4th comparison; the 128th check will be made
+ * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is
+ * necessary to put more guard bytes at the end of the window, or
+ * to check more often for insufficient lookahead.
+ */
+ scan++, match++;
+ do {
+ } while (*(ush*)(scan+=2) == *(ush*)(match+=2) &&
+ *(ush*)(scan+=2) == *(ush*)(match+=2) &&
+ *(ush*)(scan+=2) == *(ush*)(match+=2) &&
+ *(ush*)(scan+=2) == *(ush*)(match+=2) &&
+ scan < strend);
+ /* The funny "do {}" generates better code on most compilers */
+
+ /* Here, scan <= window+strstart+257 */
+ Assert(scan <= window+(unsigned)(window_size-1), "wild scan");
+ if (*scan == *match) scan++;
+
+ len = (MAX_MATCH - 1) - (int)(strend-scan);
+ scan = strend - (MAX_MATCH-1);
+
+#else /* UNALIGNED_OK */
+
+ 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;
+
+#endif /* UNALIGNED_OK */
+
+ if (len > best_len) {
+ match_start = cur_match;
+ best_len = len;
+ if (len >= nice_match) break;
+#ifdef UNALIGNED_OK
+ scan_end = *(ush*)(scan+best_len-1);
+#else
+ scan_end1 = scan[best_len-1];
+ scan_end = scan[best_len];
+#endif
+ }
+ } while ((cur_match = prev[cur_match & WMASK]) > limit
+ && --chain_length != 0);
+
+ return best_len;
+}
+#endif /* ASMV */
+
+#ifdef DEBUG
+/* ===========================================================================
+ * Check that the match at match_start is indeed a match.
+ */
+local void check_match(start, match, length)
+ IPos start, match;
+ int length;
+{
+ /* check that the match is indeed a match */
+ if (memcmp((char*)window + match,
+ (char*)window + start, length) != EQUAL) {
+ fprintf(stderr,
+ " start %d, match %d, length %d\n",
+ start, match, length);
+ error("invalid match");
+ }
+ if (verbose > 1) {
+ fprintf(stderr,"\\[%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).
+ */
+local void fill_window()
+{
+ register 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.
+ */
+ulg deflate()
+{
+ 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 */
+ register unsigned match_length = MIN_MATCH-1; /* length of best match */
+#ifdef DEBUG
+ extern long isize; /* byte length of input file, for debug only */
+#endif
+
+ /* 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.
+ * On MSDOS, file.tmp -> file.tmz. On VMS, file.tmp -> file.tmp-gz.
+ *
+ * Using gz on MSDOS would create too many file name conflicts. For
+ * example, foo.txt -> foo.tgz (.tgz must be reserved as shorthand for
+ * tar.gz). Similarly, foo.dir and foo.doc would both be mapped to foo.dgz.
+ * I also considered 12345678.txt -> 12345txt.gz but this truncates the name
+ * too heavily. There is no ideal solution given the MSDOS 8+3 limitation.
+ *
+ * For the meaning of all compilation flags, see comments in Makefile.in.
+ */
+
+#ifdef RCSID
+static char rcsid[] = "$Id: gzip.c,v 1.1 1999/10/05 16:24:56 andersen Exp $";
+#endif
+
+#include <ctype.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+ /* configuration */
+
+#ifdef NO_TIME_H
+# include <sys/time.h>
+#else
+# include <time.h>
+#endif
+
+#ifndef NO_FCNTL_H
+# include <fcntl.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
+# include <stdlib.h>
+#else
+ extern int errno;
+#endif
+
+#if defined(DIRENT)
+# include <dirent.h>
+ typedef struct dirent dir_type;
+# define NLENGTH(dirent) ((int)strlen((dirent)->d_name))
+# define DIR_OPT "DIRENT"
+#else
+# define NLENGTH(dirent) ((dirent)->d_namlen)
+# ifdef SYSDIR
+# include <sys/dir.h>
+ typedef struct direct dir_type;
+# define DIR_OPT "SYSDIR"
+# else
+# ifdef SYSNDIR
+# include <sys/ndir.h>
+ typedef struct direct dir_type;
+# define DIR_OPT "SYSNDIR"
+# else
+# ifdef NDIR
+# include <ndir.h>
+ typedef struct direct dir_type;
+# define DIR_OPT "NDIR"
+# else
+# define NO_DIR
+# define DIR_OPT "NO_DIR"
+# endif
+# endif
+# endif
+#endif
+
+#ifndef NO_UTIME
+# ifndef NO_UTIME_H
+# include <utime.h>
+# define TIME_OPT "UTIME"
+# else
+# ifdef HAVE_SYS_UTIME_H
+# include <sys/utime.h>
+# define TIME_OPT "SYS_UTIME"
+# else
+ struct utimbuf {
+ time_t actime;
+ time_t modtime;
+ };
+# define TIME_OPT ""
+# endif
+# endif
+#else
+# define TIME_OPT "NO_UTIME"
+#endif
+
+#if !defined(S_ISDIR) && defined(S_IFDIR)
+# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#endif
+#if !defined(S_ISREG) && defined(S_IFREG)
+# define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+#endif
+
+typedef RETSIGTYPE (*sig_type) OF((int));
+
+#ifndef O_BINARY
+# define O_BINARY 0 /* creation mode for open() */
+#endif
+
+#ifndef O_CREAT
+ /* Pure BSD system? */
+# include <sys/file.h>
+# ifndef O_CREAT
+# define O_CREAT FCREAT
+# endif
+# ifndef O_EXCL
+# define O_EXCL FEXCL
+# endif
+#endif
+
+#ifndef S_IRUSR
+# define S_IRUSR 0400
+#endif
+#ifndef S_IWUSR
+# define S_IWUSR 0200
+#endif
+#define RW_USER (S_IRUSR | S_IWUSR) /* creation mode for open() */
+
+#ifndef MAX_PATH_LEN
+# define MAX_PATH_LEN 1024 /* max pathname length */
+#endif
+
+#ifndef SEEK_END
+# define SEEK_END 2
+#endif
+
+#ifdef NO_OFF_T
+ typedef long off_t;
+ off_t lseek OF((int fd, off_t offset, int whence));
+#endif
+
+/* Separator for file name parts (see shorten_name()) */
+#ifdef NO_MULTIPLE_DOTS
+# define PART_SEP "-"
+#else
+# define PART_SEP "."
+#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);
+#ifndef MAXSEG_64K
+ DECLARE(ush, tab_prefix, 1L<<BITS);
+#else
+ DECLARE(ush, tab_prefix0, 1L<<(BITS-1));
+ DECLARE(ush, tab_prefix1, 1L<<(BITS-1));
+#endif
+
+ /* local variables */
+
+int ascii = 0; /* convert end-of-lines to local OS conventions */
+int to_stdout = 0; /* output to stdout (-c) */
+int decompress = 0; /* decompress (-d) */
+int no_name = -1; /* don't save or restore the original file name */
+int no_time = -1; /* don't save or restore the original file time */
+int foreground; /* set if program run in foreground */
+char *progname; /* program name */
+static int method = DEFLATED;/* compression method */
+static int exit_code = OK; /* program exit code */
+int save_orig_name; /* set if original name must be saved */
+int last_member; /* set for .zip and .Z files */
+int part_nb; /* number of parts in .gz file */
+long time_stamp; /* original time stamp (modification time) */
+long ifile_size; /* input file size, -1 for devices (debug only) */
+char *env; /* contents of GZIP env variable */
+char **args = NULL; /* argv pointer if GZIP env variable defined */
+char z_suffix[MAX_SUFFIX+1]; /* default suffix (can be set with --suffix) */
+int z_len; /* strlen(z_suffix) */
+
+long bytes_in; /* number of input bytes */
+long bytes_out; /* number of output bytes */
+char ifname[MAX_PATH_LEN]; /* input file name */
+char ofname[MAX_PATH_LEN]; /* output file name */
+int remove_ofname = 0; /* remove output file on error */
+struct stat istat; /* status for input file */
+int ifd; /* input file descriptor */
+int ofd; /* output file descriptor */
+unsigned insize; /* valid bytes in inbuf */
+unsigned inptr; /* index of next byte to be processed in inbuf */
+unsigned outcnt; /* bytes in output buffer */
+
+/* local functions */
+
+local void treat_stdin OF((void));
+static int (*work) OF((int infile, int outfile)) = zip; /* function to call */
+
+#define strequ(s1, s2) (strcmp((s1),(s2)) == 0)
+
+/* ======================================================================== */
+// int main (argc, argv)
+// int argc;
+// char **argv;
+int gzip_main(struct FileInfo * i, int argc, char * * argv)
+{
+ foreground = signal(SIGINT, SIG_IGN) != SIG_IGN;
+ if (foreground) {
+ (void) signal (SIGINT, (sig_type)abort_gzip);
+ }
+#ifdef SIGTERM
+ if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
+ (void) signal(SIGTERM, (sig_type)abort_gzip);
+ }
+#endif
+#ifdef SIGHUP
+ if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
+ (void) signal(SIGHUP, (sig_type)abort_gzip);
+ }
+#endif
+
+ strncpy(z_suffix, Z_SUFFIX, sizeof(z_suffix)-1);
+ z_len = strlen(z_suffix);
+
+ to_stdout = 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);
+#ifndef MAXSEG_64K
+ ALLOC(ush, tab_prefix, 1L<<BITS);
+#else
+ ALLOC(ush, tab_prefix0, 1L<<(BITS-1));
+ ALLOC(ush, tab_prefix1, 1L<<(BITS-1));
+#endif
+
+ /* And get to work */
+ treat_stdin();
+ do_exit(exit_code);
+ return exit_code; /* just to avoid lint warning */
+}
+
+/* ========================================================================
+ * Compress or decompress stdin
+ */
+local void treat_stdin()
+{
+ SET_BINARY_MODE(fileno(stdout));
+ strcpy(ifname, "stdin");
+ strcpy(ofname, "stdout");
+
+ /* Get the time stamp on the input file. */
+ time_stamp = 0; /* time unknown by default */
+
+ ifile_size = -1L; /* convention for unknown size */
+
+ clear_bufs(); /* clear input and output buffers */
+ to_stdout = 1;
+ part_nb = 0;
+
+ /* Actually do the compression/decompression. Loop over zipped members.
+ */
+ if ((*work)(fileno(stdin), fileno(stdout)) != OK) return;
+}
+
+/* ========================================================================
+ * Free all dynamically allocated variables and exit with the given code.
+ */
+local void do_exit(int exitcode)
+{
+ static int in_exit = 0;
+
+ if (in_exit) exit(exitcode);
+ in_exit = 1;
+ if (env != NULL) free(env), env = NULL;
+ if (args != NULL) free((char*)args), args = NULL;
+ FREE(inbuf);
+ FREE(outbuf);
+ FREE(d_buf);
+ FREE(window);
+#ifndef MAXSEG_64K
+ FREE(tab_prefix);
+#else
+ FREE(tab_prefix0);
+ FREE(tab_prefix1);
+#endif
+ exit(exitcode);
+}
+/* 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.
+ *
+ */
+
+#include <ctype.h>
+
+#ifdef RCSID
+static char rcsid[] = "$Id: gzip.c,v 1.1 1999/10/05 16:24:56 andersen Exp $";
+#endif
+
+/* ===========================================================================
+ * 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 */
+
+
+local int near extra_lbits[LENGTH_CODES] /* extra bits for each length code */
+ = {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};
+
+local int near extra_dbits[D_CODES] /* extra bits for each distance code */
+ = {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};
+
+local int near extra_blbits[BL_CODES]/* extra bits for each bit length code */
+ = {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 */
+
+local ct_data near dyn_ltree[HEAP_SIZE]; /* literal and length tree */
+local ct_data near dyn_dtree[2*D_CODES+1]; /* distance tree */
+
+local ct_data near 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).
+ */
+
+local ct_data near static_dtree[D_CODES];
+/* The static distance tree. (Actually a trivial tree since all codes use
+ * 5 bits.)
+ */
+
+local ct_data near bl_tree[2*BL_CODES+1];
+/* Huffman tree for the bit lengths */
+
+typedef struct tree_desc {
+ ct_data near *dyn_tree; /* the dynamic tree */
+ ct_data near *static_tree; /* corresponding static tree or NULL */
+ int near *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;
+
+local tree_desc near l_desc =
+{dyn_ltree, static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS, 0};
+
+local tree_desc near d_desc =
+{dyn_dtree, static_dtree, extra_dbits, 0, D_CODES, MAX_BITS, 0};
+
+local tree_desc near bl_desc =
+{bl_tree, (ct_data near *)0, extra_blbits, 0, BL_CODES, MAX_BL_BITS, 0};
+
+
+local ush near bl_count[MAX_BITS+1];
+/* number of codes at each bit length for an optimal tree */
+
+local uch near 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.
+ */
+
+local int near heap[2*L_CODES+1]; /* heap used to build the Huffman trees */
+local int heap_len; /* number of elements in the heap */
+local 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.
+ */
+
+local uch near depth[2*L_CODES+1];
+/* Depth of each subtree used as tie breaker for trees of equal frequency */
+
+local uch length_code[MAX_MATCH-MIN_MATCH+1];
+/* length code for each normalized match length (0 == MIN_MATCH) */
+
+local 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.
+ */
+
+local int near base_length[LENGTH_CODES];
+/* First normalized length for each code (0 = MIN_MATCH) */
+
+local int near 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 */
+
+local uch near 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.
+ */
+
+local unsigned last_lit; /* running index in l_buf */
+local unsigned last_dist; /* running index in d_buf */
+local unsigned last_flags; /* running index in flag_buf */
+local uch flags; /* current flags not yet saved in flag_buf */
+local 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.
+ */
+
+local ulg opt_len; /* bit length of current block with optimal trees */
+local ulg static_len; /* bit length of current block with static trees */
+
+local ulg compressed_len; /* total bit length of compressed file */
+
+local ulg input_len; /* total byte length of input file */
+/* input_len is for debugging only since we can get it by other means. */
+
+ush *file_type; /* pointer to UNKNOWN, BINARY or ASCII */
+int *file_method; /* pointer to DEFLATE or STORE */
+
+#ifdef DEBUG
+extern ulg bits_sent; /* bit length of the compressed data */
+extern long isize; /* byte length of input file */
+#endif
+
+extern long block_start; /* window offset of current block */
+extern unsigned near strstart; /* window offset of current string */
+
+/* ===========================================================================
+ * Local (static) routines in this file.
+ */
+
+local void init_block OF((void));
+local void pqdownheap OF((ct_data near *tree, int k));
+local void gen_bitlen OF((tree_desc near *desc));
+local void gen_codes OF((ct_data near *tree, int max_code));
+local void build_tree OF((tree_desc near *desc));
+local void scan_tree OF((ct_data near *tree, int max_code));
+local void send_tree OF((ct_data near *tree, int max_code));
+local int build_bl_tree OF((void));
+local void send_all_trees OF((int lcodes, int dcodes, int blcodes));
+local void compress_block OF((ct_data near *ltree, ct_data near *dtree));
+local void set_file_type OF((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) fprintf(stderr,"\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.
+ */
+
+#define MAX(a,b) (a >= b ? a : b)
+/* 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).
+ */
+void ct_init(attr, methodp)
+ ush *attr; /* pointer to internal file attribute */
+ int *methodp; /* pointer to compression method */
+{
+ 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 = input_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 near *)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.
+ */
+local void init_block()
+{
+ 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).
+ */
+local void pqdownheap(tree, k)
+ ct_data near *tree; /* the tree to restore */
+ int k; /* node to move down */
+{
+ 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.
+ */
+local void gen_bitlen(desc)
+ tree_desc near *desc; /* the tree descriptor */
+{
+ ct_data near *tree = desc->dyn_tree;
+ int near *extra = desc->extra_bits;
+ int base = desc->extra_base;
+ int max_code = desc->max_code;
+ int max_length = desc->max_length;
+ ct_data near *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.
+ */
+local void gen_codes (tree, max_code)
+ ct_data near *tree; /* the tree to decorate */
+ int max_code; /* largest code with non zero frequency */
+{
+ 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.
+ */
+local void build_tree(desc)
+ tree_desc near *desc; /* the tree descriptor */
+{
+ ct_data near *tree = desc->dyn_tree;
+ ct_data near *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) {
+ fprintf(stderr,"\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 near *)desc);
+
+ /* The field len is now set, we can generate the bit codes */
+ gen_codes ((ct_data near *)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.)
+ */
+local void scan_tree (tree, max_code)
+ ct_data near *tree; /* the tree to be scanned */
+ int max_code; /* and its largest code of non zero frequency */
+{
+ 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.
+ */
+local void send_tree (tree, max_code)
+ ct_data near *tree; /* the tree to be scanned */
+ int max_code; /* and its largest code of non zero frequency */
+{
+ 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.
+ */
+local int build_bl_tree()
+{
+ 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 near *)dyn_ltree, l_desc.max_code);
+ scan_tree((ct_data near *)dyn_dtree, d_desc.max_code);
+
+ /* Build the bit length tree: */
+ build_tree((tree_desc near *)(&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.
+ */
+local void send_all_trees(lcodes, dcodes, blcodes)
+ int lcodes, dcodes, blcodes; /* number of codes for each tree */
+{
+ 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 near *)dyn_ltree, lcodes-1); /* send the literal tree */
+ Tracev((stderr, "\nlit tree: sent %ld", bits_sent));
+
+ send_tree((ct_data near *)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.
+ */
+ulg flush_block(buf, stored_len, eof)
+ char *buf; /* input block, or NULL if too old */
+ ulg stored_len; /* length of input block */
+ int eof; /* true if this is the last block for a file */
+{
+ 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 near *)(&l_desc));
+ Tracev((stderr, "\nlit data: dyn %ld, stat %ld", opt_len, static_len));
+
+ build_tree((tree_desc near *)(&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;
+ input_len += stored_len; /* for debugging only */
+
+ 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:
+ */
+#ifdef FORCE_METHOD
+#else
+ if (stored_len <= opt_lenb && eof && compressed_len == 0L && seekable()) {
+#endif
+ /* Since LIT_BUFSIZE <= 2*WSIZE, the input data must be there: */
+ if (buf == (char*)0) error ("block vanished");
+
+ copy_block(buf, (unsigned)stored_len, 0); /* without header */
+ compressed_len = stored_len << 3;
+ *file_method = STORED;
+
+#ifdef FORCE_METHOD
+#else
+ } else if (stored_len+4 <= opt_lenb && buf != (char*)0) {
+ /* 4: two words for the lengths */
+#endif
+ /* 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 */
+
+#ifdef FORCE_METHOD
+#else
+ } else if (static_lenb == opt_lenb) {
+#endif
+ send_bits((STATIC_TREES<<1)+eof, 3);
+ compress_block((ct_data near *)static_ltree, (ct_data near *)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 near *)dyn_ltree, (ct_data near *)dyn_dtree);
+ compressed_len += 3 + opt_len;
+ }
+ Assert (compressed_len == bits_sent, "bad compressed size");
+ init_block();
+
+ if (eof) {
+ Assert (input_len == isize, "bad input size");
+ 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.
+ */
+int ct_tally (dist, lc)
+ int dist; /* distance of matched string */
+ int lc; /* match length-MIN_MATCH or unmatched char (if dist==0) */
+{
+ 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
+ */
+local void compress_block(ltree, dtree)
+ ct_data near *ltree; /* literal tree */
+ ct_data near *dtree; /* distance tree */
+{
+ 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).
+ */
+local void set_file_type()
+{
+ 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) {
+ warn("-l used on binary file", "");
+ }
+}
+/* util.c -- utility functions for gzip support
+ * 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.
+ */
+
+#ifdef RCSID
+static char rcsid[] = "$Id: gzip.c,v 1.1 1999/10/05 16:24:56 andersen Exp $";
+#endif
+
+#include <ctype.h>
+#include <errno.h>
+#include <sys/types.h>
+
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+#ifndef NO_FCNTL_H
+# include <fcntl.h>
+#endif
+
+#if defined(STDC_HEADERS) || !defined(NO_STDLIB_H)
+# include <stdlib.h>
+#else
+ extern int errno;
+#endif
+
+extern ulg crc_32_tab[]; /* crc table, defined below */
+
+/* ===========================================================================
+ * Copy input to output unchanged: zcat == cat with --force.
+ * IN assertion: insize bytes have already been read in inbuf.
+ */
+int copy(in, out)
+ int in, out; /* input and output file descriptors */
+{
+ errno = 0;
+ while (insize != 0 && (int)insize != EOF) {
+ write_buf(out, (char*)inbuf, insize);
+ bytes_out += insize;
+ insize = read(in, (char*)inbuf, INBUFSIZ);
+ }
+ if ((int)insize == EOF && errno != 0) {
+ read_error();
+ }
+ bytes_in = bytes_out;
+ return OK;
+}
+
+/* ========================================================================
+ * Put string s in lower case, return s.
+ */
+char *strlwr(s)
+ char *s;
+{
+ char *t;
+ for (t = s; *t; t++) *t = tolow(*t);
+ return s;
+}
+
+#if defined(NO_STRING_H) && !defined(STDC_HEADERS)
+
+/* Provide missing strspn and strcspn functions. */
+
+# ifndef __STDC__
+# define const
+# endif
+
+int strspn OF((const char *s, const char *accept));
+int strcspn OF((const char *s, const char *reject));
+
+/* ========================================================================
+ * Return the length of the maximum initial segment
+ * of s which contains only characters in accept.
+ */
+int strspn(s, accept)
+ const char *s;
+ const char *accept;
+{
+ register const char *p;
+ register const char *a;
+ register int count = 0;
+
+ for (p = s; *p != '\0'; ++p) {
+ for (a = accept; *a != '\0'; ++a) {
+ if (*p == *a) break;
+ }
+ if (*a == '\0') return count;
+ ++count;
+ }
+ return count;
+}
+
+/* ========================================================================
+ * Return the length of the maximum inital segment of s
+ * which contains no characters from reject.
+ */
+int strcspn(s, reject)
+ const char *s;
+ const char *reject;
+{
+ register int count = 0;
+
+ while (*s != '\0') {
+ if (strchr(reject, *s++) != NULL) return count;
+ ++count;
+ }
+ return count;
+}
+
+#endif /* NO_STRING_H */
+
+/* ========================================================================
+ * Add an environment variable (if any) before argv, and update argc.
+ * Return the expanded environment variable to be freed later, or NULL
+ * if no options were added to argv.
+ */
+#define SEPARATOR " \t" /* separators in env variable */
+
+char *add_envopt(argcp, argvp, env)
+ int *argcp; /* pointer to argc */
+ char ***argvp; /* pointer to argv */
+ char *env; /* name of environment variable */
+{
+ char *p; /* running pointer through env variable */
+ char **oargv; /* runs through old argv array */
+ char **nargv; /* runs through new argv array */
+ int oargc = *argcp; /* old argc */
+ int nargc = 0; /* number of arguments in env variable */
+
+ env = (char*)getenv(env);
+ if (env == NULL) return NULL;
+
+ p = (char*)xmalloc(strlen(env)+1);
+ env = strcpy(p, env); /* keep env variable intact */
+
+ for (p = env; *p; nargc++ ) { /* move through env */
+ p += strspn(p, SEPARATOR); /* skip leading separators */
+ if (*p == '\0') break;
+
+ p += strcspn(p, SEPARATOR); /* find end of word */
+ if (*p) *p++ = '\0'; /* mark it */
+ }
+ if (nargc == 0) {
+ free(env);
+ return NULL;
+ }
+ *argcp += nargc;
+ /* Allocate the new argv array, with an extra element just in case
+ * the original arg list did not end with a NULL.
+ */
+ nargv = (char**)calloc(*argcp+1, sizeof(char *));
+ if (nargv == NULL) error("out of memory");
+ oargv = *argvp;
+ *argvp = nargv;
+
+ /* Copy the program name first */
+ if (oargc-- < 0) error("argc<=0");
+ *(nargv++) = *(oargv++);
+
+ /* Then copy the environment args */
+ for (p = env; nargc > 0; nargc--) {
+ p += strspn(p, SEPARATOR); /* skip separators */
+ *(nargv++) = p; /* store start */
+ while (*p++) ; /* skip over word */
+ }
+
+ /* Finally copy the old args and add a NULL (usual convention) */
+ while (oargc--) *(nargv++) = *(oargv++);
+ *nargv = NULL;
+ return env;
+}
+/* ========================================================================
+ * Display compression ratio on the given stream on 6 characters.
+ */
+void display_ratio(num, den, file)
+ long num;
+ long den;
+ FILE *file;
+{
+ long ratio; /* 1000 times the compression ratio */
+
+ if (den == 0) {
+ ratio = 0; /* no compression */
+ } else if (den < 2147483L) { /* (2**31 -1)/1000 */
+ ratio = 1000L*num/den;
+ } else {
+ ratio = num/(den/1000L);
+ }
+ if (ratio < 0) {
+ putc('-', file);
+ ratio = -ratio;
+ } else {
+ putc(' ', file);
+ }
+ fprintf(file, "%2ld.%1ld%%", ratio / 10L, ratio % 10L);
+}
+
+
+/* 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.
+ */
+
+#ifdef RCSID
+static char rcsid[] = "$Id: gzip.c,v 1.1 1999/10/05 16:24:56 andersen Exp $";
+#endif
+
+#include <ctype.h>
+#include <sys/types.h>
+
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+#ifndef NO_FCNTL_H
+# include <fcntl.h>
+#endif
+
+local ulg crc; /* crc on uncompressed file data */
+long header_bytes; /* number of bytes in gzip header */
+
+/* ===========================================================================
+ * Deflate in to out.
+ * IN assertions: the input and output buffers are cleared.
+ * The variables time_stamp and save_orig_name are initialized.
+ */
+int zip(in, out)
+ int in, out; /* input and output file descriptors */
+{
+ uch 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_byte(GZIP_MAGIC[0]); /* magic header */
+ put_byte(GZIP_MAGIC[1]);
+ put_byte(DEFLATED); /* compression method */
+
+ put_byte(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)
+ */
+int file_read(buf, size)
+ 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;
+}
+#endif