gzip.h

   1 /* gzip.h -- common declarations for all gzip modules
   2
   3    Copyright (C) 1997, 1998, 1999, 2001, 2006, 2007 Free Software
   4    Foundation, Inc.
   5
   6    Copyright (C) 1992-1993 Jean-loup Gailly.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3, or (at your option)
  11    any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software Foundation,
  20    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  21
  22 #if defined(__STDC__) || defined(PROTO)
  23 #  define OF(args)  args
  24 #else
  25 #  define OF(args)  ()
  26 #endif
  27
  28 #ifdef __STDC__
  29    typedef void *voidp;
  30 #else
  31    typedef char *voidp;
  32 #endif
  33
  34 #ifndef __attribute__
  35 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
  36 #  define __attribute__(x)
  37 # endif
  38 #endif
  39
  40 #ifndef ATTRIBUTE_NORETURN
  41 # define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
  42 #endif
  43
  44 /* I don't like nested includes, but the following headers are used
  45  * too often
  46  */
  47 #include <stdio.h>
  48 #include <sys/types.h> /* for off_t */
  49 #include <time.h>
  50 #if defined HAVE_STRING_H || defined STDC_HEADERS
  51 #  include <string.h>
  52 #  if !defined STDC_HEADERS && defined HAVE_MEMORY_H && !defined __GNUC__
  53 #    include <memory.h>
  54 #  endif
  55 #  define memzero(s, n)     memset ((voidp)(s), 0, (n))
  56 #else
  57 #  include <strings.h>
  58 #  define strchr            index
  59 #  define strrchr           rindex
  60 #  define memcpy(d, s, n)   bcopy((s), (d), (n))
  61 #  define memcmp(s1, s2, n) bcmp((s1), (s2), (n))
  62 #  define memzero(s, n)     bzero((s), (n))
  63 #endif
  64
  65 #ifndef RETSIGTYPE
  66 #  define RETSIGTYPE void
  67 #endif
  68
  69 #define local static
  70
  71 typedef unsigned char  uch;
  72 typedef unsigned short ush;
  73 typedef unsigned long  ulg;
  74
  75 /* Return codes from gzip */
  76 #define OK      0
  77 #define ERROR   1
  78 #define WARNING 2
  79
  80 /* Compression methods (see algorithm.doc) */
  81 #define STORED      0
  82 #define COMPRESSED  1
  83 #define PACKED      2
  84 #define LZHED       3
  85 /* methods 4 to 7 reserved */
  86 #define DEFLATED    8
  87 #define MAX_METHODS 9
  88 extern int method;         /* compression method */
  89
  90 /* To save memory for 16 bit systems, some arrays are overlaid between
  91  * the various modules:
  92  * deflate:  prev+head   window      d_buf  l_buf  outbuf
  93  * unlzw:    tab_prefix  tab_suffix  stack  inbuf  outbuf
  94  * inflate:              window             inbuf
  95  * unpack:               window             inbuf  prefix_len
  96  * unlzh:    left+right  window      c_table inbuf c_len
  97  * For compression, input is done in window[]. For decompression, output
  98  * is done in window except for unlzw.
  99  */
 100
 101 #ifndef INBUFSIZ
 102 #  ifdef SMALL_MEM
 103 #    define INBUFSIZ  0x2000  /* input buffer size */
 104 #  else
 105 #    define INBUFSIZ  0x8000  /* input buffer size */
 106 #  endif
 107 #endif
 108 #define INBUF_EXTRA  64     /* required by unlzw() */
 109
 110 #ifndef OUTBUFSIZ
 111 #  ifdef SMALL_MEM
 112 #    define OUTBUFSIZ   8192  /* output buffer size */
 113 #  else
 114 #    define OUTBUFSIZ  16384  /* output buffer size */
 115 #  endif
 116 #endif
 117 #define OUTBUF_EXTRA 2048   /* required by unlzw() */
 118
 119 #ifndef DIST_BUFSIZE
 120 #  ifdef SMALL_MEM
 121 #    define DIST_BUFSIZE 0x2000 /* buffer for distances, see trees.c */
 122 #  else
 123 #    define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
 124 #  endif
 125 #endif
 126
 127 #ifdef DYN_ALLOC
 128 #  define EXTERN(type, array)  extern type * near array
 129 #  define DECLARE(type, array, size)  type * near array
 130 #  define ALLOC(type, array, size) { \
 131       array = (type*)fcalloc((size_t)(((size)+1L)/2), 2*sizeof(type)); \
 132       if (!array) xalloc_die (); \
 133    }
 134 #  define FREE(array) {if (array != NULL) fcfree(array), array=NULL;}
 135 #else
 136 #  define EXTERN(type, array)  extern type array[]
 137 #  define DECLARE(type, array, size)  type array[size]
 138 #  define ALLOC(type, array, size)
 139 #  define FREE(array)
 140 #endif
 141
 142 EXTERN(uch, inbuf);          /* input buffer */
 143 EXTERN(uch, outbuf);         /* output buffer */
 144 EXTERN(ush, d_buf);          /* buffer for distances, see trees.c */
 145 EXTERN(uch, window);         /* Sliding window and suffix table (unlzw) */
 146 #define tab_suffix window
 147 #ifndef MAXSEG_64K
 148 #  define tab_prefix prev    /* hash link (see deflate.c) */
 149 #  define head (prev+WSIZE)  /* hash head (see deflate.c) */
 150    EXTERN(ush, tab_prefix);  /* prefix code (see unlzw.c) */
 151 #else
 152 #  define tab_prefix0 prev
 153 #  define head tab_prefix1
 154    EXTERN(ush, tab_prefix0); /* prefix for even codes */
 155    EXTERN(ush, tab_prefix1); /* prefix for odd  codes */
 156 #endif
 157
 158 extern unsigned insize; /* valid bytes in inbuf */
 159 extern unsigned inptr;  /* index of next byte to be processed in inbuf */
 160 extern unsigned outcnt; /* bytes in output buffer */
 161
 162 extern off_t bytes_in;   /* number of input bytes */
 163 extern off_t bytes_out;  /* number of output bytes */
 164 extern off_t header_bytes;/* number of bytes in gzip header */
 165
 166 extern int  ifd;        /* input file descriptor */
 167 extern int  ofd;        /* output file descriptor */
 168 extern char ifname[];   /* input file name or "stdin" */
 169 extern char ofname[];   /* output file name or "stdout" */
 170 extern char *program_name;  /* program name */
 171
 172 extern struct timespec time_stamp; /* original time stamp (modification time) */
 173 extern off_t ifile_size; /* input file size, -1 for devices (debug only) */
 174
 175 typedef int file_t;     /* Do not use stdio */
 176 #define NO_FILE  (-1)   /* in memory compression */
 177
 178
 179 #define PACK_MAGIC     "\037\036" /* Magic header for packed files */
 180 #define GZIP_MAGIC     "\037\213" /* Magic header for gzip files, 1F 8B */
 181 #define OLD_GZIP_MAGIC "\037\236" /* Magic header for gzip 0.5 = freeze 1.x */
 182 #define LZH_MAGIC      "\037\240" /* Magic header for SCO LZH Compress files*/
 183 #define PKZIP_MAGIC    "\120\113\003\004" /* Magic header for pkzip files */
 184
 185 /* gzip flag byte */
 186 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
 187 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
 188 #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 189 #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 190 #define COMMENT      0x10 /* bit 4 set: file comment present */
 191 #define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 192 #define RESERVED     0xC0 /* bit 6,7:   reserved */
 193
 194 /* internal file attribute */
 195 #define UNKNOWN 0xffff
 196 #define BINARY  0
 197 #define ASCII   1
 198
 199 #ifndef WSIZE
 200 #  define WSIZE 0x8000     /* window size--must be a power of two, and */
 201 #endif                     /*  at least 32K for zip's deflate method */
 202
 203 #define MIN_MATCH  3
 204 #define MAX_MATCH  258
 205 /* The minimum and maximum match lengths */
 206
 207 #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
 208 /* Minimum amount of lookahead, except at the end of the input file.
 209  * See deflate.c for comments about the MIN_MATCH+1.
 210  */
 211
 212 #define MAX_DIST  (WSIZE-MIN_LOOKAHEAD)
 213 /* In order to simplify the code, particularly on 16 bit machines, match
 214  * distances are limited to MAX_DIST instead of WSIZE.
 215  */
 216
 217 extern int decrypt;        /* flag to turn on decryption */
 218 extern int exit_code;      /* program exit code */
 219 extern int verbose;        /* be verbose (-v) */
 220 extern int quiet;          /* be quiet (-q) */
 221 extern int level;          /* compression level */
 222 extern int test;           /* check .z file integrity */
 223 extern int to_stdout;      /* output to stdout (-c) */
 224 extern int save_orig_name; /* set if original name must be saved */
 225
 226 #define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf(0))
 227 #define try_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf(1))
 228
 229 /* put_byte is used for the compressed output, put_ubyte for the
 230  * uncompressed output. However unlzw() uses window for its
 231  * suffix table instead of its output buffer, so it does not use put_ubyte
 232  * (to be cleaned up).
 233  */
 234 #define put_byte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==OUTBUFSIZ)\
 235    flush_outbuf();}
 236 #define put_ubyte(c) {window[outcnt++]=(uch)(c); if (outcnt==WSIZE)\
 237    flush_window();}
 238
 239 /* Output a 16 bit value, lsb first */
 240 #define put_short(w) \
 241 { if (outcnt < OUTBUFSIZ-2) { \
 242     outbuf[outcnt++] = (uch) ((w) & 0xff); \
 243     outbuf[outcnt++] = (uch) ((ush)(w) >> 8); \
 244   } else { \
 245     put_byte((uch)((w) & 0xff)); \
 246     put_byte((uch)((ush)(w) >> 8)); \
 247   } \
 248 }
 249
 250 /* Output a 32 bit value to the bit stream, lsb first */
 251 #define put_long(n) { \
 252     put_short((n) & 0xffff); \
 253     put_short(((ulg)(n)) >> 16); \
 254 }
 255
 256 #define seekable()    0  /* force sequential output */
 257 #define translate_eol 0  /* no option -a yet */
 258
 259 #define tolow(c)  (isupper (c) ? tolower (c) : (c))  /* force to lower case */
 260
 261 /* Macros for getting two-byte and four-byte header values */
 262 #define SH(p) ((ush)(uch)((p)[0]) | ((ush)(uch)((p)[1]) << 8))
 263 #define LG(p) ((ulg)(SH(p)) | ((ulg)(SH((p)+2)) << 16))
 264
 265 /* Diagnostic functions */
 266 #ifdef DEBUG
 267 #  define Assert(cond,msg) {if (!(cond)) gzip_error (msg);}
 268 #  define Trace(x) fprintf x
 269 #  define Tracev(x) {if (verbose) fprintf x ;}
 270 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
 271 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
 272 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
 273 #else
 274 #  define Assert(cond,msg)
 275 #  define Trace(x)
 276 #  define Tracev(x)
 277 #  define Tracevv(x)
 278 #  define Tracec(c,x)
 279 #  define Tracecv(c,x)
 280 #endif
 281
 282 #define WARN(msg) {if (!quiet) fprintf msg ; \
 283                    if (exit_code == OK) exit_code = WARNING;}
 284
 285         /* in zip.c: */
 286 extern int zip        OF((int in, int out));
 287 extern int file_read  OF((char *buf,  unsigned size));
 288
 289         /* in unzip.c */
 290 extern int unzip      OF((int in, int out));
 291 extern int check_zipfile OF((int in));
 292
 293         /* in unpack.c */
 294 extern int unpack     OF((int in, int out));
 295
 296         /* in unlzh.c */
 297 extern int unlzh      OF((int in, int out));
 298
 299         /* in gzip.c */
 300 void abort_gzip OF((void)) ATTRIBUTE_NORETURN;
 301
 302         /* in deflate.c */
 303 void lm_init OF((int pack_level, ush *flags));
 304 off_t deflate OF((void));
 305
 306         /* in trees.c */
 307 void ct_init     OF((ush *attr, int *method));
 308 int  ct_tally    OF((int dist, int lc));
 309 off_t flush_block OF((char *buf, ulg stored_len, int eof));
 310
 311         /* in bits.c */
 312 void     bi_init    OF((file_t zipfile));
 313 void     send_bits  OF((int value, int length));
 314 unsigned bi_reverse OF((unsigned value, int length));
 315 void     bi_windup  OF((void));
 316 void     copy_block OF((char *buf, unsigned len, int header));
 317 extern   int (*read_buf) OF((char *buf, unsigned size));
 318
 319         /* in util.c: */
 320 extern int copy           OF((int in, int out));
 321 extern ulg  updcrc        OF((uch *s, unsigned n));
 322 extern void clear_bufs    OF((void));
 323 extern int  fill_inbuf    OF((int eof_ok));
 324 extern void flush_outbuf  OF((void));
 325 extern void flush_window  OF((void));
 326 extern void write_buf     OF((int fd, voidp buf, unsigned cnt));
 327 extern int read_buffer    OF((int fd, voidp buf, unsigned int cnt));
 328 extern char *strlwr       OF((char *s));
 329 extern char *gzip_base_name OF((char *fname));
 330 extern int xunlink        OF((char *fname));
 331 extern void make_simple_name OF((char *name));
 332 extern char *add_envopt   OF((int *argcp, char ***argvp, char *env));
 333 extern void gzip_error    OF((char *m));
 334 extern void xalloc_die    OF((void)) ATTRIBUTE_NORETURN;
 335 extern void warning       OF((char *m));
 336 extern void read_error    OF((void));
 337 extern void write_error   OF((void));
 338 extern void display_ratio OF((off_t num, off_t den, FILE *file));
 339 extern void fprint_off    OF((FILE *, off_t, int));
 340
 341         /* in inflate.c */
 342 extern int inflate OF((void));
 343
 344         /* in yesno.c */
 345 extern int yesno OF((void));