/* 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 statictypedef 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 9extern 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 */#    define INBUFSIZ  0x2000  /* 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 */#    define DIST_BUFSIZE 0x2000 /* 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");return -1}\   }#  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)#endifEXTERN(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 */#endifextern 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 level;          /* compression level */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 Assert(cond,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;}	/* 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 */int lm_init OF((int pack_level, ush *flags));ulg  gzip_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 *basename     OF((char *fname));extern void make_simple_name OF((char *name));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 gzip_inflate OF((void));