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Annotation of coherent/g/usr/bin/gzip/gzip.h, revision 1.1

1.1     ! root        1: /* gzip.h -- common declarations for all gzip modules
        !             2:  * Copyright (C) 1992-1993 Jean-loup Gailly.
        !             3:  * This is free software; you can redistribute it and/or modify it under the
        !             4:  * terms of the GNU General Public License, see the file COPYING.
        !             5:  */
        !             6: 
        !             7: #if defined(__STDC__) || defined(PROTO)
        !             8: #  define OF(args)  args
        !             9: #else
        !            10: #  define OF(args)  ()
        !            11: #endif
        !            12: 
        !            13: #ifdef __STDC__
        !            14:    typedef void *voidp;
        !            15: #else
        !            16:    typedef char *voidp;
        !            17: #endif
        !            18: 
        !            19: /* I don't like nested includes, but the string functions are used too often */
        !            20: #if !defined(NO_STRING_H) || defined(STDC_HEADERS)
        !            21: #  include <string.h>
        !            22: #  define memzero(s, n)     memset ((s), 0, (n))
        !            23: #else
        !            24: #  include <strings.h>
        !            25: #  define strchr            index 
        !            26: #  define strrchr           rindex
        !            27: #  define memcpy(d, s, n)   bcopy((s), (d), (n)) 
        !            28: #  define memcmp(s1, s2, n) bcmp((s1), (s2), (n)) 
        !            29: #  define memzero(s, n)     bzero((s), (n))
        !            30: #endif
        !            31: 
        !            32: #if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H)
        !            33: #  include <memory.h>
        !            34: #endif
        !            35: 
        !            36: #ifndef RETSIGTYPE
        !            37: #  define RETSIGTYPE void
        !            38: #endif
        !            39: 
        !            40: #define local static
        !            41: 
        !            42: typedef unsigned char  uch;
        !            43: typedef unsigned short ush;
        !            44: typedef unsigned long  ulg;
        !            45: 
        !            46: /* Return codes from gzip */
        !            47: #define OK      0
        !            48: #define ERROR   1
        !            49: #define WARNING 2
        !            50: 
        !            51: /* Compression methods (see algorithm.doc) */
        !            52: #define STORED     0
        !            53: #define COMPRESSED 1
        !            54: #define PACKED     2
        !            55: /* methods 3 to 7 reserved */
        !            56: #define DEFLATED   8
        !            57: extern int method;         /* compression method */
        !            58: 
        !            59: /* To save memory for 16 bit systems, some arrays are overlayed between
        !            60:  * the various modules:
        !            61:  * deflate:  prev+head   window      d_buf  l_buf  outbuf
        !            62:  * unlzw:    tab_prefix  tab_suffix  stack  inbuf  outbuf
        !            63:  * inflate:              window             inbuf
        !            64:  * unpack:               window             inbuf
        !            65:  * For compression, input is done in window[]. For decompression, output
        !            66:  * is done in window except for unlzw.
        !            67:  */
        !            68: 
        !            69: #ifndef        INBUFSIZ
        !            70: #  define INBUFSIZ  0x8000  /* input buffer size */
        !            71: #endif
        !            72: #define INBUF_EXTRA  64     /* required by unlzw() */
        !            73: 
        !            74: #ifndef        OUTBUFSIZ
        !            75: #  define OUTBUFSIZ  16384  /* output buffer size */
        !            76: #endif
        !            77: #define OUTBUF_EXTRA 2048   /* required by unlzw() */
        !            78: 
        !            79: #define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
        !            80: 
        !            81: #ifdef DYN_ALLOC
        !            82: #  define EXTERN(type, array)  extern type * near array
        !            83: #  define DECLARE(type, array, size)  type * near array
        !            84: #  define ALLOC(type, array, size) { \
        !            85:       array = (type*)fcalloc((unsigned)(((size)+1L)/2), 2*sizeof(type)); \
        !            86:       if (array == NULL) error("insufficient memory"); \
        !            87:    }
        !            88: #  define FREE(array) {if (array != NULL) fcfree(array), array=NULL;}
        !            89: #else
        !            90: #  define EXTERN(type, array)  extern type array[]
        !            91: #  define DECLARE(type, array, size)  type array[size]
        !            92: #  define ALLOC(type, array, size)
        !            93: #  define FREE(array)
        !            94: #endif
        !            95: 
        !            96: EXTERN(uch, inbuf);          /* input buffer */
        !            97: EXTERN(uch, outbuf);         /* output buffer */
        !            98: EXTERN(ush, d_buf);          /* buffer for distances, see trees.c */
        !            99: EXTERN(uch, window);         /* Sliding window and suffix table (unlzw) */
        !           100: #define tab_suffix window
        !           101: #ifndef MAXSEG_64K
        !           102: #  define tab_prefix prev    /* hash link (see deflate.c) */
        !           103: #  define head (prev+WSIZE)  /* hash head (see deflate.c) */
        !           104:    EXTERN(ush, tab_prefix);  /* prefix code (see unlzw.c) */
        !           105: #else
        !           106: #  define tab_prefix0 prev
        !           107: #  define head tab_prefix1
        !           108:    EXTERN(ush, tab_prefix0); /* prefix for even codes */
        !           109:    EXTERN(ush, tab_prefix1); /* prefix for odd  codes */
        !           110: #endif
        !           111: 
        !           112: extern unsigned insize; /* valid bytes in inbuf */
        !           113: extern unsigned inptr;  /* index of next byte to be processed in inbuf */
        !           114: extern unsigned outcnt; /* bytes in output buffer */
        !           115: 
        !           116: extern long bytes_in;   /* number of input bytes */
        !           117: extern long bytes_out;  /* number of output bytes */
        !           118: extern long overhead;   /* number of bytes in gzip header */
        !           119: 
        !           120: #define isize bytes_in
        !           121: /* for compatibility with old zip sources (to be cleaned) */
        !           122: 
        !           123: extern int  ifd;        /* input file descriptor */
        !           124: extern int  ofd;        /* output file descriptor */
        !           125: extern char ifname[];   /* input filename or "stdin" */
        !           126: extern char ofname[];   /* output filename or "stdout" */
        !           127: 
        !           128: extern ulg time_stamp;  /* original time stamp (modification time) */
        !           129: extern long ifile_size; /* input file size, -1 for devices (debug only) */
        !           130: 
        !           131: typedef int file_t;     /* Do not use stdio */
        !           132: #define NO_FILE  (-1)   /* in memory compression */
        !           133: 
        !           134: 
        !           135: #define        GZIP_MAGIC     "\037\213" /* Magic header for gzip files, 1F 8B */
        !           136: #define        OLD_GZIP_MAGIC "\037\236" /* Magic header for gzip 0.5 = freeze 1.x */
        !           137: #define        PKZIP_MAGIC  "PK\003\004" /* Magic header for pkzip files */
        !           138: #define        PACK_MAGIC     "\037\036" /* Magic header for packed files */
        !           139: 
        !           140: /* gzip flag byte */
        !           141: #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
        !           142: #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
        !           143: #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
        !           144: #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
        !           145: #define COMMENT      0x10 /* bit 4 set: file comment present */
        !           146: #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
        !           147: #define RESERVED     0xC0 /* bit 6,7:   reserved */
        !           148: 
        !           149: /* internal file attribute */
        !           150: #define UNKNOWN (-1)
        !           151: #define BINARY  0
        !           152: #define ASCII   1
        !           153: 
        !           154: #ifndef WSIZE
        !           155: #  define WSIZE 0x8000     /* window size--must be a power of two, and */
        !           156: #endif                     /*  at least 32K for zip's deflate method */
        !           157: 
        !           158: #define MIN_MATCH  3
        !           159: #define MAX_MATCH  258
        !           160: /* The minimum and maximum match lengths */
        !           161: 
        !           162: #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
        !           163: /* Minimum amount of lookahead, except at the end of the input file.
        !           164:  * See deflate.c for comments about the MIN_MATCH+1.
        !           165:  */
        !           166: 
        !           167: #define MAX_DIST  (WSIZE-MIN_LOOKAHEAD)
        !           168: /* In order to simplify the code, particularly on 16 bit machines, match
        !           169:  * distances are limited to MAX_DIST instead of WSIZE.
        !           170:  */
        !           171: 
        !           172: extern int decrypt;        /* flag to turn on decryption */
        !           173: extern int exit_code;      /* program exit code */
        !           174: extern int verbose;        /* be verbose (-v) */
        !           175: extern int quiet;          /* be quiet (-q) */
        !           176: extern int level;          /* compression level */
        !           177: extern int test;           /* check .z file integrity */
        !           178: extern int to_stdout;      /* output to stdout (-c) */
        !           179: extern int save_orig_name; /* set if original name must be saved */
        !           180: extern int text_mode;      /* set if original file is a text file (in variable
        !           181:                           record format for VMS). Must stay 0 if unknown. */
        !           182: 
        !           183: #define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
        !           184: 
        !           185: /* put_byte is used for the compressed output, put_char for the
        !           186:  * uncompressed output. However unlzw() uses window for its
        !           187:  * suffix table instead of its output buffer, so it does not use put_char.
        !           188:  * (to be cleaned up).
        !           189:  */
        !           190: #define put_byte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==OUTBUFSIZ)\
        !           191:    flush_outbuf();}
        !           192: #define put_char(c) {window[outcnt++]=(uch)(c); if (outcnt==WSIZE)\
        !           193:    flush_window();}
        !           194: 
        !           195: /* Output a 16 bit value, lsb first */
        !           196: #define put_short(w) \
        !           197: { if (outcnt < OUTBUFSIZ-2) { \
        !           198:     outbuf[outcnt++] = (uch) ((w) & 0xff); \
        !           199:     outbuf[outcnt++] = (uch) ((ush)(w) >> 8); \
        !           200:   } else { \
        !           201:     put_byte((uch)((w) & 0xff)); \
        !           202:     put_byte((uch)((ush)(w) >> 8)); \
        !           203:   } \
        !           204: }
        !           205: 
        !           206: /* Output a 32 bit value to the bit stream, lsb first */
        !           207: #define put_long(n) { \
        !           208:     put_short((n) & 0xffff); \
        !           209:     put_short(((ulg)(n)) >> 16); \
        !           210: }
        !           211: 
        !           212: #define seekable()    0  /* force sequential output */
        !           213: #define translate_eol 0  /* no option -a yet */
        !           214: 
        !           215: #define tolow(c)  (isupper(c) ? (c)-'A'+'a' : (c))    /* force to lower case */
        !           216: 
        !           217: /* Macros for getting two-byte and four-byte header values */
        !           218: #define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
        !           219: #define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
        !           220: 
        !           221: /* Diagnostic functions */
        !           222: #ifdef DEBUG
        !           223: #  define Assert(cond,msg) {if(!(cond)) error(msg);}
        !           224: #  define Trace(x) fprintf x
        !           225: #  define Tracev(x) {if (verbose) fprintf x ;}
        !           226: #  define Tracevv(x) {if (verbose>1) fprintf x ;}
        !           227: #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
        !           228: #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
        !           229: #else
        !           230: #  define Assert(cond,msg)
        !           231: #  define Trace(x)
        !           232: #  define Tracev(x)
        !           233: #  define Tracevv(x)
        !           234: #  define Tracec(c,x)
        !           235: #  define Tracecv(c,x)
        !           236: #endif
        !           237: 
        !           238: #define WARN(msg) {if (!quiet) fprintf msg ; \
        !           239:                   if (exit_code == OK) exit_code = WARNING;}
        !           240: 
        !           241:        /* in zip.c: */
        !           242: extern void zip    OF((int in, int out));
        !           243: extern int file_read  OF((char *buf,  unsigned size));
        !           244: 
        !           245:        /* in unzip.c */
        !           246: extern void unzip        OF((int in, int out));
        !           247: extern int check_zipfile OF((int in));
        !           248: 
        !           249:        /* in unpack.c */
        !           250: extern void unpack        OF((int in, int out));
        !           251: 
        !           252:        /* in gzip.c */
        !           253: RETSIGTYPE abort_gzip   OF((void));
        !           254: 
        !           255:         /* in deflate.c */
        !           256: void lm_init OF((int pack_level, ush *flags));
        !           257: ulg  deflate OF((void));
        !           258: 
        !           259:         /* in trees.c */
        !           260: void ct_init     OF((ush *attr, int *method));
        !           261: int  ct_tally    OF((int dist, int lc));
        !           262: ulg  flush_block OF((char *buf, ulg stored_len, int eof));
        !           263: 
        !           264:         /* in bits.c */
        !           265: void     bi_init    OF((file_t zipfile));
        !           266: void     send_bits  OF((int value, int length));
        !           267: unsigned bi_reverse OF((unsigned value, int length));
        !           268: void     bi_windup  OF((void));
        !           269: void     copy_block OF((char *buf, unsigned len, int header));
        !           270: extern   int (*read_buf) OF((char *buf, unsigned size));
        !           271: 
        !           272:        /* in util.c: */
        !           273: extern ulg  updcrc        OF((uch *s, unsigned n));
        !           274: extern void clear_bufs    OF((void));
        !           275: extern int  fill_inbuf    OF((void));
        !           276: extern void flush_outbuf  OF((void));
        !           277: extern void flush_window  OF((void));
        !           278: extern char *strlwr       OF((char *s));
        !           279: extern char *basename     OF((char *fname));
        !           280: extern char *add_envopt   OF((int *argcp, char ***argvp, char *env));
        !           281: extern void error         OF((char *m));
        !           282: extern void warn          OF((char *a, char *b));
        !           283: extern void read_error    OF((void));
        !           284: extern void write_error   OF((void));
        !           285: extern void display_ratio OF((long num, long den));
        !           286: extern voidp xmalloc      OF((unsigned int size));
        !           287: 
        !           288:        /* in inflate.c */
        !           289: extern int inflate OF((void));

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