316 lines
10 KiB
C
316 lines
10 KiB
C
/* gzip.h -- common declarations for all gzip modules
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* Copyright (C) 1992-1993 Jean-loup Gailly.
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* This is free software; you can redistribute it and/or modify it under the
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* terms of the GNU General Public License, see the file COPYING.
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*/
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#if defined(__STDC__) || defined(PROTO)
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# define OF(args) args
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#else
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# define OF(args) ()
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#endif
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#ifdef __STDC__
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typedef void *voidp;
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#else
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typedef char *voidp;
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#endif
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/* I don't like nested includes, but the string and io functions are used
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* too often
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*/
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#include <stdio.h>
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#if !defined(NO_STRING_H) || defined(STDC_HEADERS)
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# include <string.h>
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# if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H) && !defined(__GNUC__)
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# include <memory.h>
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# endif
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# define memzero(s, n) memset ((voidp)(s), 0, (n))
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#else
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# include <strings.h>
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# define strchr index
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# define strrchr rindex
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# define memcpy(d, s, n) bcopy((s), (d), (n))
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# define memcmp(s1, s2, n) bcmp((s1), (s2), (n))
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# define memzero(s, n) bzero((s), (n))
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#endif
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#ifndef RETSIGTYPE
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# define RETSIGTYPE void
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#endif
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#define local static
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typedef unsigned char uch;
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typedef unsigned short ush;
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typedef unsigned long ulg;
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/* Return codes from gzip */
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#define OK 0
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#define ERROR 1
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#define WARNING 2
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/* Compression methods (see algorithm.doc) */
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#define STORED 0
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#define COMPRESSED 1
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#define PACKED 2
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#define LZHED 3
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/* methods 4 to 7 reserved */
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#define DEFLATED 8
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#define MAX_METHODS 9
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extern int method; /* compression method */
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/* To save memory for 16 bit systems, some arrays are overlaid between
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* the various modules:
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* deflate: prev+head window d_buf l_buf outbuf
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* unlzw: tab_prefix tab_suffix stack inbuf outbuf
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* inflate: window inbuf
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* unpack: window inbuf prefix_len
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* unlzh: left+right window c_table inbuf c_len
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* For compression, input is done in window[]. For decompression, output
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* is done in window except for unlzw.
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*/
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#ifndef INBUFSIZ
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# ifdef SMALL_MEM
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# define INBUFSIZ 0x2000 /* input buffer size */
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# else
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# define INBUFSIZ 0x8000 /* input buffer size */
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# endif
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#endif
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#define INBUF_EXTRA 64 /* required by unlzw() */
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#ifndef OUTBUFSIZ
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# ifdef SMALL_MEM
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# define OUTBUFSIZ 8192 /* output buffer size */
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# else
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# define OUTBUFSIZ 16384 /* output buffer size */
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# endif
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#endif
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#define OUTBUF_EXTRA 2048 /* required by unlzw() */
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#ifndef DIST_BUFSIZE
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# ifdef SMALL_MEM
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# define DIST_BUFSIZE 0x2000 /* buffer for distances, see trees.c */
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# else
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# define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
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# endif
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#endif
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#ifdef DYN_ALLOC
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# define EXTERN(type, array) extern type * near array
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# define DECLARE(type, array, size) type * near array
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# define ALLOC(type, array, size) { \
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array = (type*)fcalloc((size_t)(((size)+1L)/2), 2*sizeof(type)); \
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if (array == NULL) error("insufficient memory"); \
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}
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# define FREE(array) {if (array != NULL) fcfree(array), array=NULL;}
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#else
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# define EXTERN(type, array) extern type array[]
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# define DECLARE(type, array, size) type array[size]
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# define ALLOC(type, array, size)
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# define FREE(array)
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#endif
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EXTERN(uch, inbuf); /* input buffer */
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EXTERN(uch, outbuf); /* output buffer */
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EXTERN(ush, d_buf); /* buffer for distances, see trees.c */
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EXTERN(uch, window); /* Sliding window and suffix table (unlzw) */
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#define tab_suffix window
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#ifndef MAXSEG_64K
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# define tab_prefix prev /* hash link (see deflate.c) */
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# define head (prev+WSIZE) /* hash head (see deflate.c) */
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EXTERN(ush, tab_prefix); /* prefix code (see unlzw.c) */
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#else
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# define tab_prefix0 prev
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# define head tab_prefix1
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EXTERN(ush, tab_prefix0); /* prefix for even codes */
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EXTERN(ush, tab_prefix1); /* prefix for odd codes */
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#endif
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extern unsigned insize; /* valid bytes in inbuf */
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extern unsigned inptr; /* index of next byte to be processed in inbuf */
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extern unsigned outcnt; /* bytes in output buffer */
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extern long bytes_in; /* number of input bytes */
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extern long bytes_out; /* number of output bytes */
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extern long header_bytes;/* number of bytes in gzip header */
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#define isize bytes_in
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/* for compatibility with old zip sources (to be cleaned) */
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extern int ifd; /* input file descriptor */
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extern int ofd; /* output file descriptor */
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extern char ifname[]; /* input file name or "stdin" */
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extern char ofname[]; /* output file name or "stdout" */
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extern char *progname; /* program name */
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extern long time_stamp; /* original time stamp (modification time) */
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extern long ifile_size; /* input file size, -1 for devices (debug only) */
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typedef int file_t; /* Do not use stdio */
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#define NO_FILE (-1) /* in memory compression */
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#define PACK_MAGIC "\037\036" /* Magic header for packed files */
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#define GZIP_MAGIC "\037\213" /* Magic header for gzip files, 1F 8B */
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#define OLD_GZIP_MAGIC "\037\236" /* Magic header for gzip 0.5 = freeze 1.x */
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#define LZH_MAGIC "\037\240" /* Magic header for SCO LZH Compress files*/
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#define PKZIP_MAGIC "\120\113\003\004" /* Magic header for pkzip files */
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/* gzip flag byte */
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
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#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
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#define RESERVED 0xC0 /* bit 6,7: reserved */
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/* internal file attribute */
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#define UNKNOWN 0xffff
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#define BINARY 0
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#define ASCII 1
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#ifndef WSIZE
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# define WSIZE 0x8000 /* window size--must be a power of two, and */
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#endif /* at least 32K for zip's deflate method */
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#define MIN_MATCH 3
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#define MAX_MATCH 258
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/* The minimum and maximum match lengths */
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#define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
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/* Minimum amount of lookahead, except at the end of the input file.
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* See deflate.c for comments about the MIN_MATCH+1.
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*/
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#define MAX_DIST (WSIZE-MIN_LOOKAHEAD)
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/* In order to simplify the code, particularly on 16 bit machines, match
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* distances are limited to MAX_DIST instead of WSIZE.
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*/
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extern int decrypt; /* flag to turn on decryption */
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extern int exit_code; /* program exit code */
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extern int verbose; /* be verbose (-v) */
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extern int quiet; /* be quiet (-q) */
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extern int level; /* compression level */
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extern int test; /* check .z file integrity */
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extern int to_stdout; /* output to stdout (-c) */
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extern int save_orig_name; /* set if original name must be saved */
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#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(0))
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#define try_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(1))
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/* put_byte is used for the compressed output, put_ubyte for the
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* uncompressed output. However unlzw() uses window for its
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* suffix table instead of its output buffer, so it does not use put_ubyte
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* (to be cleaned up).
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*/
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#define put_byte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==OUTBUFSIZ)\
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flush_outbuf();}
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#define put_ubyte(c) {window[outcnt++]=(uch)(c); if (outcnt==WSIZE)\
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flush_window();}
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/* Output a 16 bit value, lsb first */
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#define put_short(w) \
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{ if (outcnt < OUTBUFSIZ-2) { \
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outbuf[outcnt++] = (uch) ((w) & 0xff); \
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outbuf[outcnt++] = (uch) ((ush)(w) >> 8); \
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} else { \
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put_byte((uch)((w) & 0xff)); \
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put_byte((uch)((ush)(w) >> 8)); \
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} \
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}
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/* Output a 32 bit value to the bit stream, lsb first */
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#define put_long(n) { \
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put_short((n) & 0xffff); \
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put_short(((ulg)(n)) >> 16); \
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}
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#define seekable() 0 /* force sequential output */
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#define translate_eol 0 /* no option -a yet */
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#define tolow(c) (isupper(c) ? (c)-'A'+'a' : (c)) /* force to lower case */
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/* Macros for getting two-byte and four-byte header values */
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#define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
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#define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
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/* Diagnostic functions */
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#ifdef DEBUG
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# define Assert(cond,msg) {if(!(cond)) error(msg);}
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# define Trace(x) fprintf x
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# define Tracev(x) {if (verbose) fprintf x ;}
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# define Tracevv(x) {if (verbose>1) fprintf x ;}
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# define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
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# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
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#else
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# define Assert(cond,msg)
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# define Trace(x)
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# define Tracev(x)
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# define Tracevv(x)
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# define Tracec(c,x)
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# define Tracecv(c,x)
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#endif
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#define WARN(msg) {if (!quiet) fprintf msg ; \
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if (exit_code == OK) exit_code = WARNING;}
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/* in zip.c: */
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extern int zip OF((int in, int out));
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extern int file_read OF((char *buf, unsigned size));
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/* in unzip.c */
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extern int unzip OF((int in, int out));
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extern int check_zipfile OF((int in));
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/* in unpack.c */
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extern int unpack OF((int in, int out));
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/* in unlzh.c */
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extern int unlzh OF((int in, int out));
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/* in gzip.c */
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RETSIGTYPE abort_gzip OF((void));
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/* in deflate.c */
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void lm_init OF((int pack_level, ush *flags));
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ulg deflate OF((void));
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/* in trees.c */
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void ct_init OF((ush *attr, int *method));
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int ct_tally OF((int dist, int lc));
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ulg flush_block OF((char *buf, ulg stored_len, int eof));
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/* in bits.c */
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void bi_init OF((file_t zipfile));
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void send_bits OF((int value, int length));
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unsigned bi_reverse OF((unsigned value, int length));
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void bi_windup OF((void));
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void copy_block OF((char *buf, unsigned len, int header));
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extern int (*read_buf) OF((char *buf, unsigned size));
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/* in util.c: */
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extern int copy OF((int in, int out));
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extern ulg updcrc OF((uch *s, unsigned n));
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extern void clear_bufs OF((void));
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extern int fill_inbuf OF((int eof_ok));
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extern void flush_outbuf OF((void));
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extern void flush_window OF((void));
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extern void write_buf OF((int fd, voidp buf, unsigned cnt));
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extern char *strlwr OF((char *s));
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extern char *basename OF((char *fname));
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extern void make_simple_name OF((char *name));
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extern char *add_envopt OF((int *argcp, char ***argvp, char *env));
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extern void error OF((char *m));
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extern void warn OF((char *a, char *b));
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extern void read_error OF((void));
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extern void write_error OF((void));
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extern void display_ratio OF((long num, long den, FILE *file));
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extern voidp xmalloc OF((unsigned int size));
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/* in inflate.c */
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extern int inflate OF((void));
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