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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.
- */
-
- /*
- * Ported to EPOC by Sander van der Wal
- *
- * $Id: gzip.h 1.1 2000-09-17 13:39:38+02 svdwal Exp svdwal $
- */
-
- typedef void *voidp;
-
- /* I don't like nested includes, but the string and io functions are used
- * too often
- */
- #include <stdio.h>
- #include <string.h>
- #define memzero(s, n) memset ((voidp)(s), 0, (n))
-
- 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
-
-
- /* 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
-
-
- #define tab_suffix window
- #define tab_prefix prev /* hash link (see deflate.c) */
- #define head (prev+WSIZE) /* hash head (see deflate.c) */
-
-
- #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.
- */
-
- #define try_byte(ifd) (inptr < insize ? inbuf[inptr++] : fill_inbuf(ifd, 1, inbuf, &insize))
-
- /* 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
-
- #ifdef __cplusplus
- extern "C" {
- #endif
-
-
- #ifdef __cplusplus
- };
- #endif