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/* 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 functions are used too often */

#if defined(HAVE_STRING_H) || defined(STDC_HEADERS)

#  include <string.h>

#  define memzero(s, n)     memset ((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

#if !defined(STDC_HEADERS) && defined(HAVE_MEMORY_H)

#  include <memory.h>

#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

/* methods 3 to 7 reserved */

#define DEFLATED   8

extern int method;         /* compression method */

/* To save memory for 16 bit systems, some arrays are overlayed 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

 * For compression, input is done in window[]. For decompression, output

 * is done in window except for unlzw.

 */

#ifndef INBUFSIZ

#  define INBUFSIZ  0x8000  /* input buffer size */

#endif

#define INBUF_EXTRA  64     /* required by unlzw() */

#ifndef OUTBUFSIZ

#  define OUTBUFSIZ  16384  /* output buffer size */

#endif

#define OUTBUF_EXTRA 2048   /* required by unlzw() */

#define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */

#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((unsigned)(((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 overhead;   /* 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 filename or "stdin" */

extern char ofname[];   /* output filename or "stdout" */

extern ulg time_stamp;  /* original time stamp (modification time) */

extern long ifile_size; /* input file size, -1 for devices (debug only) */

extern int exit_code;   /* program exit code */

typedef int file_t;     /* Do not use stdio */

#define NO_FILE  (-1)   /* in memory compression */

#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 PKZIP_MAGIC  "PK\003\004" /* Magic header for pkzip files */

#define PACK_MAGIC     "\037\036" /* Magic header for packed 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 (-1)

#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 save_orig_name; /* set if original name must be saved */

extern int verbose;        /* be verbose (-v) */

extern int level;          /* compression level */

extern int test;           /* check .z file integrity */

extern int to_stdout;      /* output to stdout (-c) */

#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())

/* put_byte is used for the compressed output, put_char for the

 * uncompressed output. However unlzw() uses window for its

 * suffix table instead of its output buffer, so it does not use put_char.

 * (to be cleaned up).

 */

#define put_byte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==OUTBUFSIZ)\

   flush_outbuf();}

#define put_char(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

        /* in zip.c: */

extern void zip    OF((int in, int out));

extern int file_read  OF((char *buf,  unsigned size));

        /* in unzip.c */

extern void unzip        OF((int in, int out));

extern int check_zipfile OF((int in));

        /* in unpack.c */

extern void unpack        OF((int in, int out));

        /* in gzip.c */

RETSIGTYPE abort_gzip   OF((void));

        /* in deflate.c */

void lm_init OF((int pack_level, 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 ulg  updcrc        OF((uch *s, unsigned n));

extern void clear_bufs    OF((void));

extern int  fill_inbuf    OF((void));

extern void flush_outbuf  OF((void));

extern void flush_window  OF((void));

extern char *strlwr       OF((char *s));

extern char *basename     OF((char *fname));

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));

extern voidp xmalloc      OF((unsigned int size));

        /* in inflate.c */

extern int inflate OF((void));