gzip.h

   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 and io functions are used
  20  * too often
  21  */
  22 #include <stdio.h>
  23 #if !defined(NO_STRING_H) || defined(STDC_HEADERS)
  24 #  include <string.h>
  25 #  if !defined(STDC_HEADERS) && !defined(NO_MEMORY_H) && !defined(__GNUC__)
  26 #    include <memory.h>
  27 #  endif
  28 #  define memzero(s, n)     memset ((voidp)(s), 0, (n))
  29 #else
  30 #  include <strings.h>
  31 #  define strchr            index
  32 #  define strrchr           rindex
  33 #  define memcpy(d, s, n)   bcopy((s), (d), (n))
  34 #  define memcmp(s1, s2, n) bcmp((s1), (s2), (n))
  35 #  define memzero(s, n)     bzero((s), (n))
  36 #endif
  37
  38 #ifndef RETSIGTYPE
  39 #  define RETSIGTYPE void
  40 #endif
  41
  42 #define local static
  43
  44 typedef unsigned char  uch;
  45 typedef unsigned short ush;
  46 typedef unsigned long  ulg;
  47
  48 /* Return codes from gzip */
  49 #define OK      0
  50 #define ERROR   1
  51 #define WARNING 2
  52
  53 /* Compression methods (see algorithm.doc) */
  54 #define STORED      0
  55 #define COMPRESSED  1
  56 #define PACKED      2
  57 #define LZHED       3
  58 /* methods 4 to 7 reserved */
  59 #define DEFLATED    8
  60 #define MAX_METHODS 9
  61 extern int method;         /* compression method */
  62
  63 /* To save memory for 16 bit systems, some arrays are overlaid between
  64  * the various modules:
  65  * deflate:  prev+head   window      d_buf  l_buf  outbuf
  66  * unlzw:    tab_prefix  tab_suffix  stack  inbuf  outbuf
  67  * inflate:              window             inbuf
  68  * unpack:               window             inbuf  prefix_len
  69  * unlzh:    left+right  window      c_table inbuf c_len
  70  * For compression, input is done in window[]. For decompression, output
  71  * is done in window except for unlzw.
  72  */
  73
  74 #ifndef INBUFSIZ
  75 #  ifdef SMALL_MEM
  76 #    define INBUFSIZ  0x2000  /* input buffer size */
  77 #  else
  78 #    define INBUFSIZ  0x8000  /* input buffer size */
  79 #  endif
  80 #endif
  81 #define INBUF_EXTRA  64     /* required by unlzw() */
  82
  83 #ifndef OUTBUFSIZ
  84 #  ifdef SMALL_MEM
  85 #    define OUTBUFSIZ   8192  /* output buffer size */
  86 #  else
  87 #    define OUTBUFSIZ  16384  /* output buffer size */
  88 #  endif
  89 #endif
  90 #define OUTBUF_EXTRA 2048   /* required by unlzw() */
  91
  92 #ifndef DIST_BUFSIZE
  93 #  ifdef SMALL_MEM
  94 #    define DIST_BUFSIZE 0x2000 /* buffer for distances, see trees.c */
  95 #  else
  96 #    define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
  97 #  endif
  98 #endif
  99
 100 #ifdef DYN_ALLOC
 101 #  define EXTERN(type, array)  extern type * near array
 102 #  define DECLARE(type, array, size)  type * near array
 103 #  define ALLOC(type, array, size) { \
 104       array = (type*)fcalloc((size_t)(((size)+1L)/2), 2*sizeof(type)); \
 105       if (array == NULL) error("insufficient memory"); \
 106    }
 107 #  define FREE(array) {if (array != NULL) fcfree(array), array=NULL;}
 108 #else
 109 #  define EXTERN(type, array)  extern type array[]
 110 #  define DECLARE(type, array, size)  type array[size]
 111 #  define ALLOC(type, array, size)
 112 #  define FREE(array)
 113 #endif
 114
 115 EXTERN(uch, inbuf);          /* input buffer */
 116 /*EXTERN(uch, outbuf);         /* output buffer */
 117 extern uch *outbuf;
 118 EXTERN(ush, d_buf);          /* buffer for distances, see trees.c */
 119 EXTERN(uch, window);         /* Sliding window and suffix table (unlzw) */
 120 #define tab_suffix window
 121 #ifndef MAXSEG_64K
 122 #  define tab_prefix prev    /* hash link (see deflate.c) */
 123 #  define head (prev+WSIZE)  /* hash head (see deflate.c) */
 124    EXTERN(ush, tab_prefix);  /* prefix code (see unlzw.c) */
 125 #else
 126 #  define tab_prefix0 prev
 127 #  define head tab_prefix1
 128    EXTERN(ush, tab_prefix0); /* prefix for even codes */
 129    EXTERN(ush, tab_prefix1); /* prefix for odd  codes */
 130 #endif
 131
 132 extern unsigned insize; /* valid bytes in inbuf */
 133 extern unsigned inptr;  /* index of next byte to be processed in inbuf */
 134 extern unsigned outcnt; /* bytes in output buffer , used for both window
 135                            and outbuf?????*/
 136 extern unsigned outbuflen;  /* length of output buffer */
 137 extern unsigned outbufptr;  /* bytes in  output buffer */
 138
 139 extern long bytes_in;   /* number of input bytes */
 140 extern long bytes_out;  /* number of output bytes */
 141 extern long header_bytes;/* number of bytes in gzip header */
 142
 143 #define isize bytes_in
 144 /* for compatibility with old zip sources (to be cleaned) */
 145
 146 extern int  ifd;        /* input file descriptor */
 147 extern int  ofd;        /* output file descriptor */
 148 extern char ifname[];   /* input file name or "stdin" */
 149 extern char ofname[];   /* output file name or "stdout" */
 150 extern char progname[];  /* program name */
 151
 152 extern long time_stamp; /* original time stamp (modification time) */
 153 extern long ifile_size; /* input file size, -1 for devices (debug only) */
 154
 155 typedef int file_t;     /* Do not use stdio */
 156 #define NO_FILE  (-1)   /* in memory compression */
 157
 158
 159 #define PACK_MAGIC     "\037\036" /* Magic header for packed files */
 160 #define GZIP_MAGIC     "\037\213" /* Magic header for gzip files, 1F 8B */
 161 #define OLD_GZIP_MAGIC "\037\236" /* Magic header for gzip 0.5 = freeze 1.x */
 162 #define LZH_MAGIC      "\037\240" /* Magic header for SCO LZH Compress files*/
 163 #define PKZIP_MAGIC    "\120\113\003\004" /* Magic header for pkzip files */
 164
 165 /* gzip flag byte */
 166 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
 167 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
 168 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 169 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 170 #define COMMENT      0x10 /* bit 4 set: file comment present */
 171 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 172 #define RESERVED     0xC0 /* bit 6,7:   reserved */
 173
 174 /* internal file attribute */
 175 #define UNKNOWN 0xffff
 176 #define BINARY  0
 177 #define ASCII   1
 178
 179 #ifndef WSIZE
 180 #  define WSIZE 0x8000     /* window size--must be a power of two, and */
 181 #endif                     /*  at least 32K for zip's deflate method */
 182
 183 #define MIN_MATCH  3
 184 #define MAX_MATCH  258
 185 /* The minimum and maximum match lengths */
 186
 187 #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
 188 /* Minimum amount of lookahead, except at the end of the input file.
 189  * See deflate.c for comments about the MIN_MATCH+1.
 190  */
 191
 192 #define MAX_DIST  (WSIZE-MIN_LOOKAHEAD)
 193 /* In order to simplify the code, particularly on 16 bit machines, match
 194  * distances are limited to MAX_DIST instead of WSIZE.
 195  */
 196
 197 extern int decrypt;        /* flag to turn on decryption */
 198 extern int exit_code;      /* program exit code */
 199 extern int verbose;        /* be verbose (-v) */
 200 extern int quiet;          /* be quiet (-q) */
 201 extern int level;          /* compression level */
 202 extern int test;           /* check .z file integrity */
 203 extern int to_stdout;      /* output to stdout (-c) */
 204 extern int save_orig_name; /* set if original name must be saved */
 205
 206 #define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf(0))
 207 #define try_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf(1))
 208
 209 /* put_byte is used for the compressed output, put_ubyte for the
 210  * uncompressed output. However unlzw() uses window for its
 211  * suffix table instead of its output buffer, so it does not use put_ubyte
 212  * (to be cleaned up).
 213  */
 214 #define put_byte(c) {outbuf[outbufptr++]=(uch)(c); if (outbufptr>=outbuflen)\
 215    {fprintf(stderr, "Error: Chamber overflow \n"); outbufptr=0;}}
 216 #define put_ubyte(c) {window[outcnt++]=(uch)(c); if (outcnt==WSIZE)\
 217    flush_window();}
 218
 219 /* Output a 16 bit value, lsb first */
 220 #define put_short(w) \
 221 {  put_byte((uch)((w) & 0xff)); \
 222     put_byte((uch)((ush)(w) >> 8)); \
 223 }
 224
 225 /* Output a 32 bit value to the bit stream, lsb first */
 226 #define put_long(n) { \
 227     put_short((n) & 0xffff); \
 228     put_short(((ulg)(n)) >> 16); \
 229 }
 230
 231 #define seekable()    0  /* force sequential output */
 232 #define translate_eol 0  /* no option -a yet */
 233
 234 #define tolow(c)  (isupper(c) ? (c)-'A'+'a' : (c))    /* force to lower case */
 235
 236 /* Macros for getting two-byte and four-byte header values */
 237 #define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
 238 #define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
 239
 240 /* Diagnostic functions */
 241 #ifdef DEBUG
 242 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
 243 #  define Trace(x) fprintf x
 244 #  define Tracev(x) {if (verbose) fprintf x ;}
 245 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
 246 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
 247 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
 248 #else
 249 #  define Assert(cond,msg)
 250 #  define Trace(x)
 251 #  define Tracev(x)
 252 #  define Tracevv(x)
 253 #  define Tracec(c,x)
 254 #  define Tracecv(c,x)
 255 #endif
 256
 257 #define WARN(msg) {if (!quiet) fprintf msg ; \
 258                    if (exit_code == OK) exit_code = WARNING;}
 259
 260         /* in zip.c: */
 261 extern int zip        OF((int in, int out));
 262 extern int file_read  OF((char *buf,  unsigned size));
 263
 264         /* in unzip.c */
 265 extern int unzip      OF((int in, int out));
 266 extern int check_zipfile OF((int in));
 267
 268         /* in unpack.c */
 269 extern int unpack     OF((int in, int out));
 270
 271         /* in unlzh.c */
 272 extern int unlzh      OF((int in, int out));
 273
 274         /* in gzip.c */
 275 RETSIGTYPE abort_gzip OF((void));
 276
 277         /* in deflate.c */
 278 void lm_init OF((int pack_level, ush *flags));
 279 ulg  deflate OF((void));
 280
 281         /* in trees.c */
 282 void ct_init     OF((ush *attr, int *method));
 283 int  ct_tally    OF((int dist, int lc));
 284 ulg  flush_block OF((char *buf, ulg stored_len, int eof));
 285
 286         /* in bits.c */
 287 void     bi_init    OF((file_t zipfile));
 288 void     send_bits  OF((int value, int length));
 289 unsigned bi_reverse OF((unsigned value, int length));
 290 void     bi_windup  OF((void));
 291 void     copy_block OF((char *buf, unsigned len, int header));
 292 extern   int (*read_buf) OF((char *buf, unsigned size));
 293
 294         /* in util.c: */
 295 extern int copy           OF((int in, int out));
 296 extern ulg  updcrc        OF((uch *s, unsigned n));
 297 extern void clear_bufs    OF((void));
 298 extern int  fill_inbuf    OF((int eof_ok));
 299 extern void flush_outbuf  OF((void));
 300 extern void flush_window  OF((void));
 301 extern void write_buf     OF((int fd, voidp buf, unsigned cnt));
 302 extern char *strlwr       OF((char *s));
 303 extern char *basename     OF((char *fname));
 304 extern void make_simple_name OF((char *name));
 305 extern char *add_envopt   OF((int *argcp, char ***argvp, char *env));
 306 extern void error         OF((char *m));
 307 extern void warn          OF((char *a, char *b));
 308 extern void read_error    OF((void));
 309 extern void write_error   OF((void));
 310 extern void display_ratio OF((long num, long den, FILE *file));
 311 extern voidp xmalloc      OF((unsigned int size));
 312
 313         /* in inflate.c */
 314 extern int inflate OF((void));