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- /* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
- /* zread.h -- common declarations for djtarx with decompression support
- * This is free software; you can redistribute it and/or modify it under the
- * terms of the GNU General Public License, see the file COPYING.
- */
-
- #ifndef __zread_h_
- #define __zread_h_
-
- #include <stdio.h>
- #include <stddef.h>
- #include <string.h>
- #define memzero(s, n) memset ((void *)(s), 0, (n))
-
- #define local static
-
- typedef unsigned char uch;
- typedef unsigned short ush;
- typedef unsigned long ulg;
-
- /* Return codes from djtarx */
- #define OK 0
- #define ERROR 1
- #define WARNING 2
-
- /* Compression methods */
- #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 */
-
- extern FILE *log_out; /* the stream to output messages */
-
- /* 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
- #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() */
-
- #ifndef DIST_BUFSIZE
- #define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
- #endif
-
- extern uch inbuf[];
- 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
- #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) */
-
- 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_out; /* number of bytes after decompression */
- extern long header_bytes; /* number of bytes in gzip header */
- extern int part_nb;
-
- extern void *ifd; /* input file/diskette descriptor */
- extern char *ifname; /* input file name or "-" */
- extern char *progname; /* program name */
- extern int pkzip; /* set for a pkzip file */
-
- #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 v_switch; /* be verbose (-v) */
- extern int test;
- extern int exit_code; /* program exit code */
- extern int z_switch;
-
- #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(0))
- #define try_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(1))
-
- #define put_ubyte(c) {window[outcnt++]=(uch)(c); if (outcnt==WSIZE)\
- flush_window();}
-
- /* 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 (v_switch) fprintf x ;}
- # define Tracevv(x) {if (v_switch) fprintf x ;}
- # define Tracec(c,x) {if (v_switch && (c)) fprintf x ;}
- # define Tracecv(c,x) {if (v_switch && (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 (v_switch) fprintf msg ; \
- if (exit_code == OK) exit_code = WARNING;}
-
- int (*decompressor)(void *);
-
- /* in djtarx.c */
- extern int tarread (char *, long);
-
- /* in zmethod.c */
- extern int get_method (void *);
-
- /* in unzip.c */
- extern int unzip (void *);
- extern int check_zipfile (void);
-
- /* in unpack.c */
- extern int unpack (void *);
-
- /* in unlzh.c */
- extern int unlzh (void *);
-
- /* in trees.c */
- void ct_init (ush *_attr, int *_method);
- int ct_tally (int _dist, int _lc);
- ulg flush_block (char *_buf, ulg _stored_len, int _eof);
-
- /* in bits.c */
- void bi_init (void);
- void send_bits (int value, int length);
- unsigned bi_reverse (unsigned value, int length);
- void bi_windup (void);
- void copy_block (char *buf, unsigned len, int header);
- extern int (*read_buf) (char *buf, unsigned size);
-
- /* in util.c: */
- extern int copy (void *);
- extern ulg updcrc (uch *s, unsigned n);
- extern void clear_bufs (void);
- extern int fill_inbuf (int eof_ok);
- extern void flush_outbuf (void);
- extern void flush_window (void);
- extern char *basename (char *fname);
- extern void error (const char *m);
- extern void warn (char *a, char *b);
- extern void read_error (void);
- extern void *xmalloc (unsigned int size);
-
- /* in inflate.c */
- extern int inflate (void);
-
- #endif /* __zread_h_ */
-