/* 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>

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.
 */


#define INBUFSIZ  0x8000  /* input buffer size */          //edit by lzj

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


#define OUTBUFSIZ   8192  /* output buffer size */
#define OUTBUF_EXTRA 2048   /* required by unlzw() */


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

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) */

#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_char() get_byte()
#define put_char(c) put_byte(c)

#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))



        /* 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));

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 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 unsigned char inbuf[];
extern unsigned char outbuf[];
extern unsigned char window[];
extern int SDRAM;
extern unsigned char fin[];
extern unsigned char fout[];
extern int fout_index;
extern int fin_left;
extern int fin_index;

	/* in inflate.c */
extern int inflate OF((void));