www.pudn.com > gzip_win.zip > gzip.h
/* 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#if !defined(NO_STRING_H) || defined(STDC_HEADERS) # include # if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H) && !defined(__GNUC__) # include # endif # define memzero(s, n) memset ((voidp)(s), 0, (n)) #else # include # 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 #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 #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. */ #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 #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((size_t)(((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 header_bytes;/* 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 file name or "stdin" */ extern char ofname[]; /* output file name or "stdout" */ extern char *progname; /* program name */ extern long time_stamp; /* original time stamp (modification time) */ extern long ifile_size; /* input file size, -1 for devices (debug only) */ typedef int file_t; /* Do not use stdio */ #define NO_FILE (-1) /* in memory compression */ #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_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)) /* 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 #define WARN(msg) {if (!quiet) fprintf msg ; \ if (exit_code == OK) exit_code = WARNING;} /* in zip.c: */ extern int zip OF((int in, int out)); extern int file_read OF((char *buf, unsigned size)); /* in unzip.c */ extern int unzip OF((int in, int out)); extern int check_zipfile OF((int in)); /* in unpack.c */ extern int unpack OF((int in, int out)); /* in unlzh.c */ extern int unlzh 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 int copy OF((int in, int out)); extern ulg updcrc OF((uch *s, unsigned n)); extern void clear_bufs OF((void)); 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 char *strlwr OF((char *s)); extern char *basename OF((char *fname)); extern void make_simple_name OF((char *name)); 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, FILE *file)); extern voidp xmalloc OF((unsigned int size)); /* in inflate.c */ extern int inflate OF((void));