contrib/file-4.12/src/file.h

   1 /*
   2  * Copyright (c) Ian F. Darwin 1986-1995.
   3  * Software written by Ian F. Darwin and others;
   4  * maintained 1995-present by Christos Zoulas and others.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice immediately at the beginning of the file, without modification,
  11  *    this list of conditions, and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28 /*
  29  * file.h - definitions for file(1) program
  30  * @(#)$Id: file.h,v 1.64 2004/11/20 23:50:12 christos Exp $
  31  */
  32
  33 #ifndef __file_h__
  34 #define __file_h__
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include <config.h>
  38 #endif
  39
  40 #include <stdio.h>      /* Include that here, to make sure __P gets defined */
  41 #include <errno.h>
  42 #ifdef HAVE_STDINT_H
  43 #include <stdint.h>
  44 #endif
  45 #ifdef HAVE_INTTYPES_H
  46 #include <inttypes.h>
  47 #endif
  48 /* Do this here and now, because struct stat gets re-defined on solaris */
  49 #include <sys/stat.h>
  50
  51 #ifndef MAGIC
  52 #define MAGIC "/etc/magic"
  53 #endif
  54
  55 #ifdef __EMX__
  56 #define PATHSEP ';'
  57 #else
  58 #define PATHSEP ':'
  59 #endif
  60
  61 #define private static
  62 #ifndef protected
  63 #define protected
  64 #endif
  65 #define public
  66
  67 #ifndef HOWMANY
  68 # define HOWMANY 65536          /* how much of the file to look at */
  69 #endif
  70 #define MAXMAGIS 4096           /* max entries in /etc/magic */
  71 #define MAXDESC 64              /* max leng of text description */
  72 #define MAXstring 32            /* max leng of "string" types */
  73
  74 #define MAGICNO         0xF11E041C
  75 #define VERSIONNO       2
  76 #define FILE_MAGICSIZE  (32 * 4)
  77
  78 #define FILE_LOAD       0
  79 #define FILE_CHECK      1
  80 #define FILE_COMPILE    2
  81
  82 struct magic {
  83         /* Word 1 */
  84         uint16_t cont_level;    /* level of ">" */
  85         uint8_t nospflag;       /* supress space character */
  86         uint8_t flag;
  87 #define INDIR   1               /* if '>(...)' appears,  */
  88 #define UNSIGNED 2              /* comparison is unsigned */
  89 #define OFFADD  4               /* if '>&' appears,  */
  90         /* Word 2 */
  91         uint8_t reln;           /* relation (0=eq, '>'=gt, etc) */
  92         uint8_t vallen;         /* length of string value, if any */
  93         uint8_t type;           /* int, short, long or string. */
  94         uint8_t in_type;        /* type of indirrection */
  95 #define                         FILE_BYTE       1
  96 #define                         FILE_SHORT      2
  97 #define                         FILE_LONG       4
  98 #define                         FILE_STRING     5
  99 #define                         FILE_DATE       6
 100 #define                         FILE_BESHORT    7
 101 #define                         FILE_BELONG     8
 102 #define                         FILE_BEDATE     9
 103 #define                         FILE_LESHORT    10
 104 #define                         FILE_LELONG     11
 105 #define                         FILE_LEDATE     12
 106 #define                         FILE_PSTRING    13
 107 #define                         FILE_LDATE      14
 108 #define                         FILE_BELDATE    15
 109 #define                         FILE_LELDATE    16
 110 #define                         FILE_REGEX      17
 111 #define                         FILE_BESTRING16 18
 112 #define                         FILE_LESTRING16 19
 113
 114 #define                         FILE_FORMAT_NAME        \
 115 /* 0 */                         "invalid 0",            \
 116 /* 1 */                         "byte",                 \
 117 /* 2 */                         "short",                \
 118 /* 3 */                         "invalid 3",            \
 119 /* 4 */                         "long",                 \
 120 /* 5 */                         "string",               \
 121 /* 6 */                         "date",                 \
 122 /* 7 */                         "beshort",              \
 123 /* 8 */                         "belong",               \
 124 /* 9 */                         "bedate"                \
 125 /* 10 */                        "leshort",              \
 126 /* 11 */                        "lelong",               \
 127 /* 12 */                        "ledate",               \
 128 /* 13 */                        "pstring",              \
 129 /* 14 */                        "ldate",                \
 130 /* 15 */                        "beldate",              \
 131 /* 16 */                        "leldate",              \
 132 /* 17 */                        "regex",                \
 133 /* 18 */                        "bestring16",           \
 134 /* 19 */                        "lestring16",
 135
 136 #define FILE_FMT_NUM    "cduxXi"
 137 #define FILE_FMT_STR    "s"
 138
 139 #define                         FILE_FORMAT_STRING      \
 140 /* 0 */                         NULL,                   \
 141 /* 1 */                         FILE_FMT_NUM,           \
 142 /* 2 */                         FILE_FMT_NUM,           \
 143 /* 3 */                         NULL,                   \
 144 /* 4 */                         FILE_FMT_NUM,           \
 145 /* 5 */                         FILE_FMT_STR,           \
 146 /* 6 */                         FILE_FMT_STR,           \
 147 /* 7 */                         FILE_FMT_NUM,           \
 148 /* 8 */                         FILE_FMT_NUM,           \
 149 /* 9 */                         FILE_FMT_STR,           \
 150 /* 10 */                        FILE_FMT_NUM,           \
 151 /* 11 */                        FILE_FMT_NUM,           \
 152 /* 12 */                        FILE_FMT_STR,           \
 153 /* 13 */                        FILE_FMT_STR,           \
 154 /* 14 */                        FILE_FMT_STR,           \
 155 /* 15 */                        FILE_FMT_STR,           \
 156 /* 16 */                        FILE_FMT_STR,           \
 157 /* 17 */                        FILE_FMT_STR,           \
 158 /* 18 */                        FILE_FMT_STR,           \
 159 /* 19 */                        FILE_FMT_STR,
 160
 161         /* Word 3 */
 162         uint8_t in_op;          /* operator for indirection */
 163         uint8_t mask_op;        /* operator for mask */
 164         uint8_t dummy1;
 165         uint8_t dummy2;
 166 #define                         FILE_OPS        "&|^+-*/%"
 167 #define                         FILE_OPAND      0
 168 #define                         FILE_OPOR       1
 169 #define                         FILE_OPXOR      2
 170 #define                         FILE_OPADD      3
 171 #define                         FILE_OPMINUS    4
 172 #define                         FILE_OPMULTIPLY 5
 173 #define                         FILE_OPDIVIDE   6
 174 #define                         FILE_OPMODULO   7
 175 #define                         FILE_OPINVERSE  0x80
 176         /* Word 4 */
 177         uint32_t offset;        /* offset to magic number */
 178         /* Word 5 */
 179         uint32_t in_offset;     /* offset from indirection */
 180         /* Word 6 */
 181         uint32_t mask;  /* mask before comparison with value */
 182         /* Word 7 */
 183         uint32_t dummy3;
 184         /* Word 8 */
 185         uint32_t dummp4;
 186         /* Words 9-16 */
 187         union VALUETYPE {
 188                 uint8_t b;
 189                 uint16_t h;
 190                 uint32_t l;
 191                 char s[MAXstring];
 192                 char *buf;
 193                 uint8_t hs[2];  /* 2 bytes of a fixed-endian "short" */
 194                 uint8_t hl[4];  /* 4 bytes of a fixed-endian "long" */
 195         } value;                /* either number or string */
 196         /* Words 17..31 */
 197         char desc[MAXDESC];     /* description */
 198 };
 199
 200 #define BIT(A)   (1 << (A))
 201 #define STRING_IGNORE_LOWERCASE         BIT(0)
 202 #define STRING_COMPACT_BLANK            BIT(1)
 203 #define STRING_COMPACT_OPTIONAL_BLANK   BIT(2)
 204 #define CHAR_IGNORE_LOWERCASE           'c'
 205 #define CHAR_COMPACT_BLANK              'B'
 206 #define CHAR_COMPACT_OPTIONAL_BLANK     'b'
 207
 208
 209 /* list of magic entries */
 210 struct mlist {
 211         struct magic *magic;            /* array of magic entries */
 212         uint32_t nmagic;                        /* number of entries in array */
 213         int mapped;  /* allocation type: 0 => apprentice_file
 214                       *                  1 => apprentice_map + malloc
 215                       *                  2 => apprentice_map + mmap */
 216         struct mlist *next, *prev;
 217 };
 218
 219 struct magic_set {
 220     struct mlist *mlist;
 221     struct cont {
 222         size_t len;
 223         int32_t *off;
 224     } c;
 225     struct out {
 226         /* Accumulation buffer */
 227         char *buf;
 228         char *ptr;
 229         size_t len;
 230         size_t size;
 231         /* Printable buffer */
 232         char *pbuf;
 233         size_t psize;
 234     } o;
 235     int error;
 236     int flags;
 237     int haderr;
 238     const char *file;
 239     size_t line;
 240 };
 241
 242 struct stat;
 243 protected char *file_fmttime(uint32_t, int);
 244 protected int file_buffer(struct magic_set *, const void *, size_t);
 245 protected int file_fsmagic(struct magic_set *, const char *, struct stat *);
 246 protected int file_pipe2file(struct magic_set *, int, const void *, size_t);
 247 protected int file_printf(struct magic_set *, const char *, ...);
 248 protected int file_reset(struct magic_set *);
 249 protected int file_tryelf(struct magic_set *, int, const unsigned char *, size_t);
 250 protected int file_zmagic(struct magic_set *, const unsigned char *, size_t);
 251 protected int file_ascmagic(struct magic_set *, const unsigned char *, size_t);
 252 protected int file_is_tar(struct magic_set *, const unsigned char *, size_t);
 253 protected int file_softmagic(struct magic_set *, const unsigned char *, size_t);
 254 protected struct mlist *file_apprentice(struct magic_set *, const char *, int);
 255 protected uint32_t file_signextend(struct magic_set *, struct magic *, uint32_t);
 256 protected void file_delmagic(struct magic *, int type, size_t entries);
 257 protected void file_badread(struct magic_set *);
 258 protected void file_badseek(struct magic_set *);
 259 protected void file_oomem(struct magic_set *);
 260 protected void file_error(struct magic_set *, int, const char *, ...);
 261 protected void file_magwarn(struct magic_set *, const char *, ...);
 262 protected void file_mdump(struct magic *);
 263 protected void file_showstr(FILE *, const char *, size_t);
 264 protected size_t file_mbswidth(const char *);
 265 protected const char *file_getbuffer(struct magic_set *);
 266
 267 #ifndef HAVE_STRERROR
 268 extern int sys_nerr;
 269 extern char *sys_errlist[];
 270 #define strerror(e) \
 271         (((e) >= 0 && (e) < sys_nerr) ? sys_errlist[(e)] : "Unknown error")
 272 #endif
 273
 274 #ifndef HAVE_STRTOUL
 275 #define strtoul(a, b, c)        strtol(a, b, c)
 276 #endif
 277
 278 #if defined(HAVE_MMAP) && defined(HAVE_SYS_MMAN_H) && !defined(QUICK)
 279 #define QUICK
 280 #endif
 281
 282 #define FILE_RCSID(id) \
 283 static const char *rcsid(const char *p) { \
 284         return rcsid(p = id); \
 285 }
 286 #else
 287
 288 #endif /* __file_h__ */