/src/file/src/apprentice.c

Source (jump to first uncovered line)
/*
 * Copyright (c) Ian F. Darwin 1986-1995.
 * Software written by Ian F. Darwin and others;
 * maintained 1995-present by Christos Zoulas and others.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice immediately at the beginning of the file, without modification,
 *    this list of conditions, and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/*
 * apprentice - make one pass through /etc/magic, learning its secrets.
 */

#include "file.h"

#ifndef lint
FILE_RCSID("@(#)$File: apprentice.c,v 1.342 2023/07/17 14:38:35 christos Exp $")
#endif  /* lint */

#include "magic.h"
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stddef.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#ifdef QUICK
#include <sys/mman.h>
#endif
#include <dirent.h>
#include <limits.h>
#ifdef HAVE_BYTESWAP_H
#include <byteswap.h>
#endif
#ifdef HAVE_SYS_BSWAP_H
#include <sys/bswap.h>
#endif


#define EATAB {while (isascii(CAST(unsigned char, *l)) && \
          isspace(CAST(unsigned char, *l)))  ++l;}
#define LOWCASE(l) (isupper(CAST(unsigned char, l)) ? \
      tolower(CAST(unsigned char, l)) : (l))
/*
 * Work around a bug in headers on Digital Unix.
 * At least confirmed for: OSF1 V4.0 878
 */
#if defined(__osf__) && defined(__DECC)
#ifdef MAP_FAILED
#undef MAP_FAILED
#endif
#endif

#ifndef MAP_FAILED
#define MAP_FAILED (void *) -1
#endif

#ifndef MAP_FILE
#define MAP_FILE 0
#endif

#define ALLOC_CHUNK CAST(size_t, 10)
#define ALLOC_INCR  CAST(size_t, 200)

#define MAP_TYPE_USER 0
#define MAP_TYPE_MALLOC 1
#define MAP_TYPE_MMAP 2

struct magic_entry {
  struct magic *mp;
  uint32_t cont_count;
  uint32_t max_count;
};

struct magic_entry_set {
  struct magic_entry *me;
  uint32_t count;
  uint32_t max;
};

struct magic_map {
  void *p;
  size_t len;
  int type;
  struct magic *magic[MAGIC_SETS];
  uint32_t nmagic[MAGIC_SETS];
};

int file_formats[FILE_NAMES_SIZE];
const size_t file_nformats = FILE_NAMES_SIZE;
const char *file_names[FILE_NAMES_SIZE];
const size_t file_nnames = FILE_NAMES_SIZE;

file_private int getvalue(struct magic_set *ms, struct magic *, const char **, int);
file_private int hextoint(int);
file_private const char *getstr(struct magic_set *, struct magic *, const char *,
    int);
file_private int parse(struct magic_set *, struct magic_entry *, const char *,
    size_t, int);
file_private void eatsize(const char **);
file_private int apprentice_1(struct magic_set *, const char *, int);
file_private ssize_t apprentice_magic_strength_1(const struct magic *);
file_private int apprentice_sort(const void *, const void *);
file_private void apprentice_list(struct mlist *, int );
file_private struct magic_map *apprentice_load(struct magic_set *,
    const char *, int);
file_private struct mlist *mlist_alloc(void);
file_private void mlist_free_all(struct magic_set *);
file_private void mlist_free(struct mlist *);
file_private void byteswap(struct magic *, uint32_t);
file_private void bs1(struct magic *);

#if defined(HAVE_BYTESWAP_H)
#define swap2(x)  bswap_16(x)
#define swap4(x)  bswap_32(x)
#define swap8(x)  bswap_64(x)
#elif defined(HAVE_SYS_BSWAP_H)
#define swap2(x)  bswap16(x)
#define swap4(x)  bswap32(x)
#define swap8(x)  bswap64(x)
#else
file_private uint16_t swap2(uint16_t);
file_private uint32_t swap4(uint32_t);
file_private uint64_t swap8(uint64_t);
#endif

file_private char *mkdbname(struct magic_set *, const char *, int);
file_private struct magic_map *apprentice_buf(struct magic_set *, struct magic *,
    size_t);
file_private struct magic_map *apprentice_map(struct magic_set *, const char *);
file_private int check_buffer(struct magic_set *, struct magic_map *, const char *);
file_private void apprentice_unmap(struct magic_map *);
file_private int apprentice_compile(struct magic_set *, struct magic_map *,
    const char *);
file_private int check_format_type(const char *, int, const char **);
file_private int check_format(struct magic_set *, struct magic *);
file_private int get_op(char);
file_private int parse_mime(struct magic_set *, struct magic_entry *, const char *,
    size_t);
file_private int parse_strength(struct magic_set *, struct magic_entry *,
    const char *, size_t);
file_private int parse_apple(struct magic_set *, struct magic_entry *, const char *,
    size_t);
file_private int parse_ext(struct magic_set *, struct magic_entry *, const char *,
    size_t);


file_private size_t magicsize = sizeof(struct magic);

file_private const char usg_hdr[] = "cont\toffset\ttype\topcode\tmask\tvalue\tdesc";

file_private struct {
  const char *name;
  size_t len;
  int (*fun)(struct magic_set *, struct magic_entry *, const char *,
      size_t);
} bang[] = {
#define DECLARE_FIELD(name) { # name, sizeof(# name) - 1, parse_ ## name }
  DECLARE_FIELD(mime),
  DECLARE_FIELD(apple),
  DECLARE_FIELD(ext),
  DECLARE_FIELD(strength),
#undef  DECLARE_FIELD
  { NULL, 0, NULL }
};

#ifdef COMPILE_ONLY

int main(int, char *[]);

int
main(int argc, char *argv[])
{
  int ret;
  struct magic_set *ms;
  char *progname;

  if ((progname = strrchr(argv[0], '/')) != NULL)
    progname++;
  else
    progname = argv[0];

  if (argc != 2) {
    (void)fprintf(stderr, "Usage: %s file\n", progname);
    return 1;
  }

  if ((ms = magic_open(MAGIC_CHECK)) == NULL) {
    (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno));
    return 1;
  }
  ret = magic_compile(ms, argv[1]) == -1 ? 1 : 0;
  if (ret == 1)
    (void)fprintf(stderr, "%s: %s\n", progname, magic_error(ms));
  magic_close(ms);
  return ret;
}
#endif /* COMPILE_ONLY */

struct type_tbl_s {
  const char name[16];
  const size_t len;
  const int type;
  const int format;
};

/*
 * XXX - the actual Single UNIX Specification says that "long" means "long",
 * as in the C data type, but we treat it as meaning "4-byte integer".
 * Given that the OS X version of file 5.04 did the same, I guess that passes
 * the actual test; having "long" be dependent on how big a "long" is on
 * the machine running "file" is silly.
 */
static const struct type_tbl_s type_tbl[] = {
# define XX(s)    s, (sizeof(s) - 1)
# define XX_NULL  "", 0
  { XX("invalid"),  FILE_INVALID,   FILE_FMT_NONE },
  { XX("byte"),   FILE_BYTE,    FILE_FMT_NUM },
  { XX("short"),    FILE_SHORT,   FILE_FMT_NUM },
  { XX("default"),  FILE_DEFAULT,   FILE_FMT_NONE },
  { XX("long"),   FILE_LONG,    FILE_FMT_NUM },
  { XX("string"),   FILE_STRING,    FILE_FMT_STR },
  { XX("date"),   FILE_DATE,    FILE_FMT_STR },
  { XX("beshort"),  FILE_BESHORT,   FILE_FMT_NUM },
  { XX("belong"),   FILE_BELONG,    FILE_FMT_NUM },
  { XX("bedate"),   FILE_BEDATE,    FILE_FMT_STR },
  { XX("leshort"),  FILE_LESHORT,   FILE_FMT_NUM },
  { XX("lelong"),   FILE_LELONG,    FILE_FMT_NUM },
  { XX("ledate"),   FILE_LEDATE,    FILE_FMT_STR },
  { XX("pstring"),  FILE_PSTRING,   FILE_FMT_STR },
  { XX("ldate"),    FILE_LDATE,   FILE_FMT_STR },
  { XX("beldate"),  FILE_BELDATE,   FILE_FMT_STR },
  { XX("leldate"),  FILE_LELDATE,   FILE_FMT_STR },
  { XX("regex"),    FILE_REGEX,   FILE_FMT_STR },
  { XX("bestring16"), FILE_BESTRING16,  FILE_FMT_STR },
  { XX("lestring16"), FILE_LESTRING16,  FILE_FMT_STR },
  { XX("search"),   FILE_SEARCH,    FILE_FMT_STR },
  { XX("medate"),   FILE_MEDATE,    FILE_FMT_STR },
  { XX("meldate"),  FILE_MELDATE,   FILE_FMT_STR },
  { XX("melong"),   FILE_MELONG,    FILE_FMT_NUM },
  { XX("quad"),   FILE_QUAD,    FILE_FMT_QUAD },
  { XX("lequad"),   FILE_LEQUAD,    FILE_FMT_QUAD },
  { XX("bequad"),   FILE_BEQUAD,    FILE_FMT_QUAD },
  { XX("qdate"),    FILE_QDATE,   FILE_FMT_STR },
  { XX("leqdate"),  FILE_LEQDATE,   FILE_FMT_STR },
  { XX("beqdate"),  FILE_BEQDATE,   FILE_FMT_STR },
  { XX("qldate"),   FILE_QLDATE,    FILE_FMT_STR },
  { XX("leqldate"), FILE_LEQLDATE,    FILE_FMT_STR },
  { XX("beqldate"), FILE_BEQLDATE,    FILE_FMT_STR },
  { XX("float"),    FILE_FLOAT,   FILE_FMT_FLOAT },
  { XX("befloat"),  FILE_BEFLOAT,   FILE_FMT_FLOAT },
  { XX("lefloat"),  FILE_LEFLOAT,   FILE_FMT_FLOAT },
  { XX("double"),   FILE_DOUBLE,    FILE_FMT_DOUBLE },
  { XX("bedouble"), FILE_BEDOUBLE,    FILE_FMT_DOUBLE },
  { XX("ledouble"), FILE_LEDOUBLE,    FILE_FMT_DOUBLE },
  { XX("leid3"),    FILE_LEID3,   FILE_FMT_NUM },
  { XX("beid3"),    FILE_BEID3,   FILE_FMT_NUM },
  { XX("indirect"), FILE_INDIRECT,    FILE_FMT_NUM },
  { XX("qwdate"),   FILE_QWDATE,    FILE_FMT_STR },
  { XX("leqwdate"), FILE_LEQWDATE,    FILE_FMT_STR },
  { XX("beqwdate"), FILE_BEQWDATE,    FILE_FMT_STR },
  { XX("name"),   FILE_NAME,    FILE_FMT_NONE },
  { XX("use"),    FILE_USE,   FILE_FMT_NONE },
  { XX("clear"),    FILE_CLEAR,   FILE_FMT_NONE },
  { XX("der"),    FILE_DER,   FILE_FMT_STR },
  { XX("guid"),   FILE_GUID,    FILE_FMT_STR },
  { XX("offset"),   FILE_OFFSET,    FILE_FMT_QUAD },
  { XX("bevarint"), FILE_BEVARINT,    FILE_FMT_STR },
  { XX("levarint"), FILE_LEVARINT,    FILE_FMT_STR },
  { XX("msdosdate"),  FILE_MSDOSDATE,   FILE_FMT_STR },
  { XX("lemsdosdate"),  FILE_LEMSDOSDATE, FILE_FMT_STR },
  { XX("bemsdosdate"),  FILE_BEMSDOSDATE, FILE_FMT_STR },
  { XX("msdostime"),  FILE_MSDOSTIME,   FILE_FMT_STR },
  { XX("lemsdostime"),  FILE_LEMSDOSTIME, FILE_FMT_STR },
  { XX("bemsdostime"),  FILE_BEMSDOSTIME, FILE_FMT_STR },
  { XX("octal"),    FILE_OCTAL,   FILE_FMT_STR },
  { XX_NULL,    FILE_INVALID,   FILE_FMT_NONE },
};

/*
 * These are not types, and cannot be preceded by "u" to make them
 * unsigned.
 */
static const struct type_tbl_s special_tbl[] = {
  { XX("der"),    FILE_DER,   FILE_FMT_STR },
  { XX("name"),   FILE_NAME,    FILE_FMT_STR },
  { XX("use"),    FILE_USE,   FILE_FMT_STR },
  { XX("octal"),    FILE_OCTAL,   FILE_FMT_STR },
  { XX_NULL,    FILE_INVALID,   FILE_FMT_NONE },
};
# undef XX
# undef XX_NULL

file_private int
get_type(const struct type_tbl_s *tbl, const char *l, const char **t)
{
  const struct type_tbl_s *p;

  for (p = tbl; p->len; p++) {
    if (strncmp(l, p->name, p->len) == 0) {
      if (t)
        *t = l + p->len;
      break;
    }
  }
  return p->type;
}

file_private off_t
maxoff_t(void) {
  if (/*CONSTCOND*/sizeof(off_t) == sizeof(int))
    return CAST(off_t, INT_MAX);
  if (/*CONSTCOND*/sizeof(off_t) == sizeof(long))
    return CAST(off_t, LONG_MAX);
  return 0x7fffffff;
}

file_private int
get_standard_integer_type(const char *l, const char **t)
{
  int type;

  if (isalpha(CAST(unsigned char, l[1]))) {
    switch (l[1]) {
    case 'C':
      /* "dC" and "uC" */
      type = FILE_BYTE;
      break;
    case 'S':
      /* "dS" and "uS" */
      type = FILE_SHORT;
      break;
    case 'I':
    case 'L':
      /*
       * "dI", "dL", "uI", and "uL".
       *
       * XXX - the actual Single UNIX Specification says
       * that "L" means "long", as in the C data type,
       * but we treat it as meaning "4-byte integer".
       * Given that the OS X version of file 5.04 did
       * the same, I guess that passes the actual SUS
       * validation suite; having "dL" be dependent on
       * how big a "long" is on the machine running
       * "file" is silly.
       */
      type = FILE_LONG;
      break;
    case 'Q':
      /* "dQ" and "uQ" */
      type = FILE_QUAD;
      break;
    default:
      /* "d{anything else}", "u{anything else}" */
      return FILE_INVALID;
    }
    l += 2;
  } else if (isdigit(CAST(unsigned char, l[1]))) {
    /*
     * "d{num}" and "u{num}"; we only support {num} values
     * of 1, 2, 4, and 8 - the Single UNIX Specification
     * doesn't say anything about whether arbitrary
     * values should be supported, but both the Solaris 10
     * and OS X Mountain Lion versions of file passed the
     * Single UNIX Specification validation suite, and
     * neither of them support values bigger than 8 or
     * non-power-of-2 values.
     */
    if (isdigit(CAST(unsigned char, l[2]))) {
      /* Multi-digit, so > 9 */
      return FILE_INVALID;
    }
    switch (l[1]) {
    case '1':
      type = FILE_BYTE;
      break;
    case '2':
      type = FILE_SHORT;
      break;
    case '4':
      type = FILE_LONG;
      break;
    case '8':
      type = FILE_QUAD;
      break;
    default:
      /* XXX - what about 3, 5, 6, or 7? */
      return FILE_INVALID;
    }
    l += 2;
  } else {
    /*
     * "d" or "u" by itself.
     */
    type = FILE_LONG;
    ++l;
  }
  if (t)
    *t = l;
  return type;
}

file_private void
init_file_tables(void)
{
  static int done = 0;
  const struct type_tbl_s *p;

  if (done)
    return;
  done++;

  for (p = type_tbl; p->len; p++) {
    assert(p->type < FILE_NAMES_SIZE);
    file_names[p->type] = p->name;
    file_formats[p->type] = p->format;
  }
  assert(p - type_tbl == FILE_NAMES_SIZE);
}

file_private int
add_mlist(struct mlist *mlp, struct magic_map *map, size_t idx)
{
  struct mlist *ml;

  mlp->map = NULL;
  if ((ml = CAST(struct mlist *, malloc(sizeof(*ml)))) == NULL)
    return -1;

  ml->map = idx == 0 ? map : NULL;
  ml->magic = map->magic[idx];
  ml->nmagic = map->nmagic[idx];
  if (ml->nmagic) {
    ml->magic_rxcomp = CAST(file_regex_t **,
        calloc(ml->nmagic, sizeof(*ml->magic_rxcomp)));
    if (ml->magic_rxcomp == NULL) {
      free(ml);
      return -1;
    }
  } else
    ml->magic_rxcomp = NULL;
  mlp->prev->next = ml;
  ml->prev = mlp->prev;
  ml->next = mlp;
  mlp->prev = ml;
  return 0;
}

/*
 * Handle one file or directory.
 */
file_private int
apprentice_1(struct magic_set *ms, const char *fn, int action)
{
  struct magic_map *map;
#ifndef COMPILE_ONLY
  size_t i;
#endif

  if (magicsize != FILE_MAGICSIZE) {
    file_error(ms, 0, "magic element size %lu != %lu",
        CAST(unsigned long, sizeof(*map->magic[0])),
        CAST(unsigned long, FILE_MAGICSIZE));
    return -1;
  }

  if (action == FILE_COMPILE) {
    map = apprentice_load(ms, fn, action);
    if (map == NULL)
      return -1;
    return apprentice_compile(ms, map, fn);
  }

#ifndef COMPILE_ONLY
  map = apprentice_map(ms, fn);
  if (map == NULL) {
    if (ms->flags & MAGIC_CHECK)
      file_magwarn(NULL, "using regular magic file `%s'", fn);
    map = apprentice_load(ms, fn, action);
    if (map == NULL)
      return -1;
  }

  for (i = 0; i < MAGIC_SETS; i++) {
    if (add_mlist(ms->mlist[i], map, i) == -1) {
      /* failed to add to any list, free explicitly */
      if (i == 0)
        apprentice_unmap(map);
      else
        mlist_free_all(ms);
      file_oomem(ms, sizeof(*ms->mlist[0]));
      return -1;
    }
  }

  if (action == FILE_LIST) {
    for (i = 0; i < MAGIC_SETS; i++) {
      printf("Set %" SIZE_T_FORMAT "u:\nBinary patterns:\n",
          i);
      apprentice_list(ms->mlist[i], BINTEST);
      printf("Text patterns:\n");
      apprentice_list(ms->mlist[i], TEXTTEST);
    }
  }
  return 0;
#else
  return 0;
#endif /* COMPILE_ONLY */
}

file_protected void
file_ms_free(struct magic_set *ms)
{
  size_t i;
  if (ms == NULL)
    return;
  for (i = 0; i < MAGIC_SETS; i++)
    mlist_free(ms->mlist[i]);
  free(ms->o.pbuf);
  free(ms->o.buf);
  free(ms->c.li);
#ifdef USE_C_LOCALE
  freelocale(ms->c_lc_ctype);
#endif
  free(ms);
}

file_protected struct magic_set *
file_ms_alloc(int flags)
{
  struct magic_set *ms;
  size_t i, len;

  if ((ms = CAST(struct magic_set *, calloc(CAST(size_t, 1u),
      sizeof(*ms)))) == NULL)
    return NULL;

  if (magic_setflags(ms, flags) == -1) {
    errno = EINVAL;
    goto free;
  }

  ms->o.buf = ms->o.pbuf = NULL;
  ms->o.blen = 0;
  len = (ms->c.len = 10) * sizeof(*ms->c.li);

  if ((ms->c.li = CAST(struct level_info *, malloc(len))) == NULL)
    goto free;

  ms->event_flags = 0;
  ms->error = -1;
  for (i = 0; i < MAGIC_SETS; i++)
    ms->mlist[i] = NULL;
  ms->file = "unknown";
  ms->line = 0;
  ms->indir_max = FILE_INDIR_MAX;
  ms->name_max = FILE_NAME_MAX;
  ms->elf_shnum_max = FILE_ELF_SHNUM_MAX;
  ms->elf_shsize_max = FILE_ELF_SHSIZE_MAX;
  ms->elf_phnum_max = FILE_ELF_PHNUM_MAX;
  ms->elf_notes_max = FILE_ELF_NOTES_MAX;
  ms->regex_max = FILE_REGEX_MAX;
  ms->bytes_max = FILE_BYTES_MAX;
  ms->encoding_max = FILE_ENCODING_MAX;
#ifdef USE_C_LOCALE
  ms->c_lc_ctype = newlocale(LC_CTYPE_MASK, "C", 0);
  assert(ms->c_lc_ctype != NULL);
#endif
  return ms;
free:
  free(ms);
  return NULL;
}

file_private void
apprentice_unmap(struct magic_map *map)
{
  size_t i;
  char *p;
  if (map == NULL)
    return;

  switch (map->type) {
  case MAP_TYPE_USER:
    break;
  case MAP_TYPE_MALLOC:
    p = CAST(char *, map->p);
    for (i = 0; i < MAGIC_SETS; i++) {
      char *b = RCAST(char *, map->magic[i]);
      if (p != NULL && b >= p && b <= p + map->len)
        continue;
      free(b);
    }
    free(p);
    break;
#ifdef QUICK
  case MAP_TYPE_MMAP:
    if (map->p && map->p != MAP_FAILED)
      (void)munmap(map->p, map->len);
    break;
#endif
  default:
    fprintf(stderr, "Bad map type %d", map->type);
    abort();
  }
  free(map);
}

file_private struct mlist *
mlist_alloc(void)
{
  struct mlist *mlist;
  if ((mlist = CAST(struct mlist *, calloc(1, sizeof(*mlist)))) == NULL) {
    return NULL;
  }
  mlist->next = mlist->prev = mlist;
  return mlist;
}

file_private void
mlist_free_all(struct magic_set *ms)
{
  size_t i;

  for (i = 0; i < MAGIC_SETS; i++) {
    mlist_free(ms->mlist[i]);
    ms->mlist[i] = NULL;
  }
}

file_private void
mlist_free_one(struct mlist *ml)
{
  size_t i;

  if (ml->map)
    apprentice_unmap(CAST(struct magic_map *, ml->map));

  for (i = 0; i < ml->nmagic; ++i) {
    if (ml->magic_rxcomp[i]) {
      file_regfree(ml->magic_rxcomp[i]);
      free(ml->magic_rxcomp[i]);
      ml->magic_rxcomp[i] = NULL;
    }
  }
  free(ml->magic_rxcomp);
  ml->magic_rxcomp = NULL;
  free(ml);
}

file_private void
mlist_free(struct mlist *mlist)
{
  struct mlist *ml, *next;

  if (mlist == NULL)
    return;

  for (ml = mlist->next; ml != mlist;) {
    next = ml->next;
    mlist_free_one(ml);
    ml = next;
  }
  mlist_free_one(mlist);
}

#ifndef COMPILE_ONLY
/* void **bufs: an array of compiled magic files */
file_protected int
buffer_apprentice(struct magic_set *ms, struct magic **bufs,
    size_t *sizes, size_t nbufs)
{
  size_t i, j;
  struct magic_map *map;

  if (nbufs == 0)
    return -1;

  (void)file_reset(ms, 0);

  init_file_tables();

  for (i = 0; i < MAGIC_SETS; i++) {
    mlist_free(ms->mlist[i]);
    if ((ms->mlist[i] = mlist_alloc()) == NULL) {
      file_oomem(ms, sizeof(*ms->mlist[0]));
      goto fail;
    }
  }

  for (i = 0; i < nbufs; i++) {
    map = apprentice_buf(ms, bufs[i], sizes[i]);
    if (map == NULL)
      goto fail;

    for (j = 0; j < MAGIC_SETS; j++) {
      if (add_mlist(ms->mlist[j], map, j) == -1) {
        file_oomem(ms, sizeof(*ms->mlist[0]));
        goto fail;
      }
    }
  }

  return 0;
fail:
  mlist_free_all(ms);
  return -1;
}
#endif

/* const char *fn: list of magic files and directories */
file_protected int
file_apprentice(struct magic_set *ms, const char *fn, int action)
{
  char *p, *mfn;
  int fileerr, errs = -1;
  size_t i, j;

  (void)file_reset(ms, 0);

  if ((fn = magic_getpath(fn, action)) == NULL)
    return -1;

  init_file_tables();

  if ((mfn = strdup(fn)) == NULL) {
    file_oomem(ms, strlen(fn));
    return -1;
  }

  for (i = 0; i < MAGIC_SETS; i++) {
    mlist_free(ms->mlist[i]);
    if ((ms->mlist[i] = mlist_alloc()) == NULL) {
      file_oomem(ms, sizeof(*ms->mlist[0]));
      for (j = 0; j < i; j++) {
        mlist_free(ms->mlist[j]);
        ms->mlist[j] = NULL;
      }
      free(mfn);
      return -1;
    }
  }
  fn = mfn;

  while (fn) {
    p = CCAST(char *, strchr(fn, PATHSEP));
    if (p)
      *p++ = '\0';
    if (*fn == '\0')
      break;
    fileerr = apprentice_1(ms, fn, action);
    errs = MAX(errs, fileerr);
    fn = p;
  }

  free(mfn);

  if (errs == -1) {
    for (i = 0; i < MAGIC_SETS; i++) {
      mlist_free(ms->mlist[i]);
      ms->mlist[i] = NULL;
    }
    file_error(ms, 0, "could not find any valid magic files!");
    return -1;
  }

#if 0
  /*
   * Always leave the database loaded
   */
  if (action == FILE_LOAD)
    return 0;

  for (i = 0; i < MAGIC_SETS; i++) {
    mlist_free(ms->mlist[i]);
    ms->mlist[i] = NULL;
  }
#endif

  switch (action) {
  case FILE_LOAD:
  case FILE_COMPILE:
  case FILE_CHECK:
  case FILE_LIST:
    return 0;
  default:
    file_error(ms, 0, "Invalid action %d", action);
    return -1;
  }
}

/*
 * Compute the real length of a magic expression, for the purposes
 * of determining how "strong" a magic expression is (approximating
 * how specific its matches are):
 *  - magic characters count 0 unless escaped.
 *  - [] expressions count 1
 *  - {} expressions count 0
 *  - regular characters or escaped magic characters count 1
 *  - 0 length expressions count as one
 */
file_private size_t
nonmagic(const char *str)
{
  const char *p;
  size_t rv = 0;

  for (p = str; *p; p++)
    switch (*p) {
    case '\\':  /* Escaped anything counts 1 */
      if (!*++p)
        p--;
      rv++;
      continue;
    case '?': /* Magic characters count 0 */
    case '*':
    case '.':
    case '+':
    case '^':
    case '$':
      continue;
    case '[': /* Bracketed expressions count 1 the ']' */
      while (*p && *p != ']')
        p++;
      p--;
      continue;
    case '{': /* Braced expressions count 0 */
      while (*p && *p != '}')
        p++;
      if (!*p)
        p--;
      continue;
    default:  /* Anything else counts 1 */
      rv++;
      continue;
    }

  return rv == 0 ? 1 : rv; /* Return at least 1 */
}


file_private size_t
typesize(int type)
{
  switch (type) {
  case FILE_BYTE:
    return 1;

  case FILE_SHORT:
  case FILE_LESHORT:
  case FILE_BESHORT:
  case FILE_MSDOSDATE:
  case FILE_BEMSDOSDATE:
  case FILE_LEMSDOSDATE:
  case FILE_MSDOSTIME:
  case FILE_BEMSDOSTIME:
  case FILE_LEMSDOSTIME:
    return 2;

  case FILE_LONG:
  case FILE_LELONG:
  case FILE_BELONG:
  case FILE_MELONG:
    return 4;

  case FILE_DATE:
  case FILE_LEDATE:
  case FILE_BEDATE:
  case FILE_MEDATE:
  case FILE_LDATE:
  case FILE_LELDATE:
  case FILE_BELDATE:
  case FILE_MELDATE:
  case FILE_FLOAT:
  case FILE_BEFLOAT:
  case FILE_LEFLOAT:
  case FILE_BEID3:
  case FILE_LEID3:
    return 4;

  case FILE_QUAD:
  case FILE_BEQUAD:
  case FILE_LEQUAD:
  case FILE_QDATE:
  case FILE_LEQDATE:
  case FILE_BEQDATE:
  case FILE_QLDATE:
  case FILE_LEQLDATE:
  case FILE_BEQLDATE:
  case FILE_QWDATE:
  case FILE_LEQWDATE:
  case FILE_BEQWDATE:
  case FILE_DOUBLE:
  case FILE_BEDOUBLE:
  case FILE_LEDOUBLE:
  case FILE_OFFSET:
  case FILE_BEVARINT:
  case FILE_LEVARINT:
    return 8;

  case FILE_GUID:
    return 16;

  default:
    return FILE_BADSIZE;
  }
}

/*
 * Get weight of this magic entry, for sorting purposes.
 */
file_private ssize_t
apprentice_magic_strength_1(const struct magic *m)
{
#define MULT 10U
  size_t ts, v;
  ssize_t val = 2 * MULT; /* baseline strength */

  switch (m->type) {
  case FILE_DEFAULT: /* make sure this sorts last */
    if (m->factor_op != FILE_FACTOR_OP_NONE) {
      file_magwarn(NULL, "Usupported factor_op in default %d",
          m->factor_op);
    }
    return 0;

  case FILE_BYTE:
  case FILE_SHORT:
  case FILE_LESHORT:
  case FILE_BESHORT:
  case FILE_LONG:
  case FILE_LELONG:
  case FILE_BELONG:
  case FILE_MELONG:
  case FILE_DATE:
  case FILE_LEDATE:
  case FILE_BEDATE:
  case FILE_MEDATE:
  case FILE_LDATE:
  case FILE_LELDATE:
  case FILE_BELDATE:
  case FILE_MELDATE:
  case FILE_FLOAT:
  case FILE_BEFLOAT:
  case FILE_LEFLOAT:
  case FILE_QUAD:
  case FILE_BEQUAD:
  case FILE_LEQUAD:
  case FILE_QDATE:
  case FILE_LEQDATE:
  case FILE_BEQDATE:
  case FILE_QLDATE:
  case FILE_LEQLDATE:
  case FILE_BEQLDATE:
  case FILE_QWDATE:
  case FILE_LEQWDATE:
  case FILE_BEQWDATE:
  case FILE_DOUBLE:
  case FILE_BEDOUBLE:
  case FILE_LEDOUBLE:
  case FILE_BEVARINT:
  case FILE_LEVARINT:
  case FILE_GUID:
  case FILE_BEID3:
  case FILE_LEID3:
  case FILE_OFFSET:
  case FILE_MSDOSDATE:
  case FILE_BEMSDOSDATE:
  case FILE_LEMSDOSDATE:
  case FILE_MSDOSTIME:
  case FILE_BEMSDOSTIME:
  case FILE_LEMSDOSTIME:
    ts = typesize(m->type);
    if (ts == FILE_BADSIZE) {
      (void)fprintf(stderr, "Bad size for type %d\n",
          m->type);
      abort();
    }
    val += ts * MULT;
    break;

  case FILE_PSTRING:
  case FILE_STRING:
  case FILE_OCTAL:
    val += m->vallen * MULT;
    break;

  case FILE_BESTRING16:
  case FILE_LESTRING16:
    val += m->vallen * MULT / 2;
    break;

  case FILE_SEARCH:
    if (m->vallen == 0)
      break;
    val += m->vallen * MAX(MULT / m->vallen, 1);
    break;

  case FILE_REGEX:
    v = nonmagic(m->value.s);
    val += v * MAX(MULT / v, 1);
    break;

  case FILE_INDIRECT:
  case FILE_NAME:
  case FILE_USE:
  case FILE_CLEAR:
    break;

  case FILE_DER:
    val += MULT;
    break;

  default:
    (void)fprintf(stderr, "Bad type %d\n", m->type);
    abort();
  }

  switch (m->reln) {
  case 'x': /* matches anything penalize */
  case '!':       /* matches almost anything penalize */
    val = 0;
    break;

  case '=': /* Exact match, prefer */
    val += MULT;
    break;

  case '>':
  case '<': /* comparison match reduce strength */
    val -= 2 * MULT;
    break;

  case '^':
  case '&': /* masking bits, we could count them too */
    val -= MULT;
    break;

  default:
    (void)fprintf(stderr, "Bad relation %c\n", m->reln);
    abort();
  }

  return val;
}


/*ARGSUSED*/
file_protected size_t
file_magic_strength(const struct magic *m,
    size_t nmagic __attribute__((__unused__)))
{
  ssize_t val = apprentice_magic_strength_1(m);

#ifdef notyet
  if (m->desc[0] == '\0') {
    size_t i;
    /*
     * Magic entries with no description get their continuations
     * added
     */
    for (i = 1; m[i].cont_level != 0 && i < MIN(nmagic, 3); i++) {
      ssize_t v = apprentice_magic_strength_1(&m[i]) >>
          (i + 1);
      val += v;
      if (m[i].desc[0] != '\0')
        break;
    }
  }
#endif

  switch (m->factor_op) {
  case FILE_FACTOR_OP_NONE:
    break;
  case FILE_FACTOR_OP_PLUS:
    val += m->factor;
    break;
  case FILE_FACTOR_OP_MINUS:
    val -= m->factor;
    break;
  case FILE_FACTOR_OP_TIMES:
    val *= m->factor;
    break;
  case FILE_FACTOR_OP_DIV:
    val /= m->factor;
    break;
  default:
    (void)fprintf(stderr, "Bad factor_op %u\n", m->factor_op);
    abort();
  }

  if (val <= 0) /* ensure we only return 0 for FILE_DEFAULT */
    val = 1;

#ifndef notyet
  /*
   * Magic entries with no description get a bonus because they depend
   * on subsequent magic entries to print something.
   */
  if (m->desc[0] == '\0')
    val++;
#endif

  return val;
}

/*
 * Sort callback for sorting entries by "strength" (basically length)
 */
file_private int
apprentice_sort(const void *a, const void *b)
{
  const struct magic_entry *ma = CAST(const struct magic_entry *, a);
  const struct magic_entry *mb = CAST(const struct magic_entry *, b);
  size_t sa = file_magic_strength(ma->mp, ma->cont_count);
  size_t sb = file_magic_strength(mb->mp, mb->cont_count);
  if (sa == sb)
    return 0;
  else if (sa > sb)
    return -1;
  else
    return 1;
}

/*
 * Shows sorted patterns list in the order which is used for the matching
 */
file_private void
apprentice_list(struct mlist *mlist, int mode)
{
  uint32_t magindex, descindex, mimeindex, lineindex;
  struct mlist *ml;
  for (ml = mlist->next; ml != mlist; ml = ml->next) {
    for (magindex = 0; magindex < ml->nmagic; magindex++) {
      struct magic *m = &ml->magic[magindex];
      if ((m->flag & mode) != mode) {
        /* Skip sub-tests */
        while (magindex + 1 < ml->nmagic &&
               ml->magic[magindex + 1].cont_level != 0)
          ++magindex;
        continue; /* Skip to next top-level test*/
      }

      /*
       * Try to iterate over the tree until we find item with
       * description/mimetype.
       */
      lineindex = descindex = mimeindex = magindex;
      for (; magindex + 1 < ml->nmagic &&
         ml->magic[magindex + 1].cont_level != 0;
         magindex++) {
        uint32_t mi = magindex + 1;
        if (*ml->magic[descindex].desc == '\0'
            && *ml->magic[mi].desc)
          descindex = mi;
        if (*ml->magic[mimeindex].mimetype == '\0'
            && *ml->magic[mi].mimetype)
          mimeindex = mi;
      }

      printf("Strength = %3" SIZE_T_FORMAT "u@%u: %s [%s]\n",
          file_magic_strength(m, ml->nmagic - magindex),
          ml->magic[lineindex].lineno,
          ml->magic[descindex].desc,
          ml->magic[mimeindex].mimetype);
    }
  }
}

file_private void
set_test_type(struct magic *mstart, struct magic *m)
{
  switch (m->type) {
  case FILE_BYTE:
  case FILE_SHORT:
  case FILE_LONG:
  case FILE_DATE:
  case FILE_BESHORT:
  case FILE_BELONG:
  case FILE_BEDATE:
  case FILE_LESHORT:
  case FILE_LELONG:
  case FILE_LEDATE:
  case FILE_LDATE:
  case FILE_BELDATE:
  case FILE_LELDATE:
  case FILE_MEDATE:
  case FILE_MELDATE:
  case FILE_MELONG:
  case FILE_QUAD:
  case FILE_LEQUAD:
  case FILE_BEQUAD:
  case FILE_QDATE:
  case FILE_LEQDATE:
  case FILE_BEQDATE:
  case FILE_QLDATE:
  case FILE_LEQLDATE:
  case FILE_BEQLDATE:
  case FILE_QWDATE:
  case FILE_LEQWDATE:
  case FILE_BEQWDATE:
  case FILE_FLOAT:
  case FILE_BEFLOAT:
  case FILE_LEFLOAT:
  case FILE_DOUBLE:
  case FILE_BEDOUBLE:
  case FILE_LEDOUBLE:
  case FILE_BEVARINT:
  case FILE_LEVARINT:
  case FILE_DER:
  case FILE_GUID:
  case FILE_OFFSET:
  case FILE_MSDOSDATE:
  case FILE_BEMSDOSDATE:
  case FILE_LEMSDOSDATE:
  case FILE_MSDOSTIME:
  case FILE_BEMSDOSTIME:
  case FILE_LEMSDOSTIME:
  case FILE_OCTAL:
    mstart->flag |= BINTEST;
    break;
  case FILE_STRING:
  case FILE_PSTRING:
  case FILE_BESTRING16:
  case FILE_LESTRING16:
    /* Allow text overrides */
    if (mstart->str_flags & STRING_TEXTTEST)
      mstart->flag |= TEXTTEST;
    else
      mstart->flag |= BINTEST;
    break;
  case FILE_REGEX:
  case FILE_SEARCH:
    /* Check for override */
    if (mstart->str_flags & STRING_BINTEST)
      mstart->flag |= BINTEST;
    if (mstart->str_flags & STRING_TEXTTEST)
      mstart->flag |= TEXTTEST;

    if (mstart->flag & (TEXTTEST|BINTEST))
      break;

    /* binary test if pattern is not text */
    if (file_looks_utf8(m->value.us, CAST(size_t, m->vallen), NULL,
        NULL) <= 0)
      mstart->flag |= BINTEST;
    else
      mstart->flag |= TEXTTEST;
    break;
  case FILE_DEFAULT:
    /* can't deduce anything; we shouldn't see this at the
       top level anyway */
    break;
  case FILE_INVALID:
  default:
    /* invalid search type, but no need to complain here */
    break;
  }
}

file_private int
addentry(struct magic_set *ms, struct magic_entry *me,
   struct magic_entry_set *mset)
{
  size_t i = me->mp->type == FILE_NAME ? 1 : 0;
  if (mset[i].me == NULL || mset[i].count == mset[i].max) {
    struct magic_entry *mp;

    size_t incr = mset[i].max + ALLOC_INCR;
    if ((mp = CAST(struct magic_entry *,
        realloc(mset[i].me, sizeof(*mp) * incr))) ==
        NULL) {
      file_oomem(ms, sizeof(*mp) * incr);
      return -1;
    }
    (void)memset(&mp[mset[i].count], 0, sizeof(*mp) *
        ALLOC_INCR);
    mset[i].me = mp;
    mset[i].max = CAST(uint32_t, incr);
    assert(mset[i].max == incr);
  }
  mset[i].me[mset[i].count++] = *me;
  memset(me, 0, sizeof(*me));
  return 0;
}

/*
 * Load and parse one file.
 */
file_private void
load_1(struct magic_set *ms, int action, const char *fn, int *errs,
   struct magic_entry_set *mset)
{
  size_t lineno = 0, llen = 0;
  char *line = NULL;
  ssize_t len;
  struct magic_entry me;

  FILE *f = fopen(ms->file = fn, "r");
  if (f == NULL) {
    if (errno != ENOENT)
      file_error(ms, errno, "cannot read magic file `%s'",
           fn);
    (*errs)++;
    return;
  }

  memset(&me, 0, sizeof(me));
  /* read and parse this file */
  for (ms->line = 1; (len = getline(&line, &llen, f)) != -1;
      ms->line++) {
    if (len == 0) /* null line, garbage, etc */
      continue;
    if (line[len - 1] == '\n') {
      lineno++;
      line[len - 1] = '\0'; /* delete newline */
    }
    switch (line[0]) {
    case '\0':  /* empty, do not parse */
    case '#': /* comment, do not parse */
      continue;
    case '!':
      if (line[1] == ':') {
        size_t i;

        for (i = 0; bang[i].name != NULL; i++) {
          if (CAST(size_t, len - 2) > bang[i].len &&
              memcmp(bang[i].name, line + 2,
              bang[i].len) == 0)
            break;
        }
        if (bang[i].name == NULL) {
          file_error(ms, 0,
              "Unknown !: entry `%s'", line);
          (*errs)++;
          continue;
        }
        if (me.mp == NULL) {
          file_error(ms, 0,
              "No current entry for :!%s type",
            bang[i].name);
          (*errs)++;
          continue;
        }
        if ((*bang[i].fun)(ms, &me,
            line + bang[i].len + 2, 
            len - bang[i].len - 2) != 0) {
          (*errs)++;
          continue;
        }
        continue;
      }
      /*FALLTHROUGH*/
    default:
    again:
      switch (parse(ms, &me, line, lineno, action)) {
      case 0:
        continue;
      case 1:
        (void)addentry(ms, &me, mset);
        goto again;
      default:
        (*errs)++;
        break;
      }
    }
  }
  if (me.mp)
    (void)addentry(ms, &me, mset);
  free(line);
  (void)fclose(f);
}

/*
 * parse a file or directory of files
 * const char *fn: name of magic file or directory
 */
file_private int
cmpstrp(const void *p1, const void *p2)
{
        return strcmp(*RCAST(char *const *, p1), *RCAST(char *const *, p2));
}


file_private uint32_t
set_text_binary(struct magic_set *ms, struct magic_entry *me, uint32_t nme,
    uint32_t starttest)
{
  static const char text[] = "text";
  static const char binary[] = "binary";
  static const size_t len = sizeof(text);

  uint32_t i = starttest;

  do {
    set_test_type(me[starttest].mp, me[i].mp);
    if ((ms->flags & MAGIC_DEBUG) == 0)
      continue;
    (void)fprintf(stderr, "%s%s%s: %s\n",
        me[i].mp->mimetype,
        me[i].mp->mimetype[0] == '\0' ? "" : "; ",
        me[i].mp->desc[0] ? me[i].mp->desc : "(no description)",
        me[i].mp->flag & BINTEST ? binary : text);
    if (me[i].mp->flag & BINTEST) {
      char *p = strstr(me[i].mp->desc, text);
      if (p && (p == me[i].mp->desc ||
          isspace(CAST(unsigned char, p[-1]))) &&
          (p + len - me[i].mp->desc == MAXstring
          || (p[len] == '\0' ||
          isspace(CAST(unsigned char, p[len])))))
        (void)fprintf(stderr, "*** Possible "
            "binary test for text type\n");
    }
  } while (++i < nme && me[i].mp->cont_level != 0);
  return i;
}

file_private void
set_last_default(struct magic_set *ms, struct magic_entry *me, uint32_t nme)
{
  uint32_t i;
  for (i = 0; i < nme; i++) {
    if (me[i].mp->cont_level == 0 &&
        me[i].mp->type == FILE_DEFAULT) {
      while (++i < nme)
        if (me[i].mp->cont_level == 0)
          break;
      if (i != nme) {
        /* XXX - Ugh! */
        ms->line = me[i].mp->lineno;
        file_magwarn(ms,
            "level 0 \"default\" did not sort last");
      }
      return;
    }
  }
}

file_private int
coalesce_entries(struct magic_set *ms, struct magic_entry *me, uint32_t nme,
    struct magic **ma, uint32_t *nma)
{
  uint32_t i, mentrycount = 0;
  size_t slen;

  for (i = 0; i < nme; i++)
    mentrycount += me[i].cont_count;

  if (mentrycount == 0) {
    *ma = NULL;
    *nma = 0;
    return 0;
  }

  slen = sizeof(**ma) * mentrycount;
  if ((*ma = CAST(struct magic *, malloc(slen))) == NULL) {
    file_oomem(ms, slen);
    return -1;
  }

  mentrycount = 0;
  for (i = 0; i < nme; i++) {
    (void)memcpy(*ma + mentrycount, me[i].mp,
        me[i].cont_count * sizeof(**ma));
    mentrycount += me[i].cont_count;
  }
  *nma = mentrycount;
  return 0;
}

file_private void
magic_entry_free(struct magic_entry *me, uint32_t nme)
{
  uint32_t i;
  if (me == NULL)
    return;
  for (i = 0; i < nme; i++)
    free(me[i].mp);
  free(me);
}

file_private struct magic_map *
apprentice_load(struct magic_set *ms, const char *fn, int action)
{
  int errs = 0;
  uint32_t i, j;
  size_t files = 0, maxfiles = 0;
  char **filearr = NULL, *mfn;
  struct stat st;
  struct magic_map *map;
  struct magic_entry_set mset[MAGIC_SETS];
  DIR *dir;
  struct dirent *d;

  memset(mset, 0, sizeof(mset));
  ms->flags |= MAGIC_CHECK; /* Enable checks for parsed files */


  if ((map = CAST(struct magic_map *, calloc(1, sizeof(*map)))) == NULL)
  {
    file_oomem(ms, sizeof(*map));
    return NULL;
  }
  map->type = MAP_TYPE_MALLOC;

  /* print silly verbose header for USG compat. */
  if (action == FILE_CHECK)
    (void)fprintf(stderr, "%s\n", usg_hdr);

  /* load directory or file */
  if (stat(fn, &st) == 0 && S_ISDIR(st.st_mode)) {
    dir = opendir(fn);
    if (!dir) {
      errs++;
      goto out;
    }
    while ((d = readdir(dir)) != NULL) {
      if (d->d_name[0] == '.')
        continue;
      if (asprintf(&mfn, "%s/%s", fn, d->d_name) < 0) {
        file_oomem(ms,
            strlen(fn) + strlen(d->d_name) + 2);
        errs++;
        closedir(dir);
        goto out;
      }
      if (stat(mfn, &st) == -1 || !S_ISREG(st.st_mode)) {
        free(mfn);
        continue;
      }
      if (files >= maxfiles) {
        size_t mlen;
        char **nfilearr;
        maxfiles = (maxfiles + 1) * 2;
        mlen = maxfiles * sizeof(*filearr);
        if ((nfilearr = CAST(char **,
            realloc(filearr, mlen))) == NULL) {
          file_oomem(ms, mlen);
          free(mfn);
          closedir(dir);
          errs++;
          goto out;
        }
        filearr = nfilearr;
      }
      filearr[files++] = mfn;
    }
    closedir(dir);
    if (filearr) {
      qsort(filearr, files, sizeof(*filearr), cmpstrp);
      for (i = 0; i < files; i++) {
        load_1(ms, action, filearr[i], &errs, mset);
        free(filearr[i]);
      }
      free(filearr);
      filearr = NULL;
    }
  } else
    load_1(ms, action, fn, &errs, mset);
  if (errs)
    goto out;

  for (j = 0; j < MAGIC_SETS; j++) {
    /* Set types of tests */
    for (i = 0; i < mset[j].count; ) {
      if (mset[j].me[i].mp->cont_level != 0) {
        i++;
        continue;
      }
      i = set_text_binary(ms, mset[j].me, mset[j].count, i);
    }
    if (mset[j].me)
      qsort(mset[j].me, mset[j].count, sizeof(*mset[0].me),
          apprentice_sort);

    /*
     * Make sure that any level 0 "default" line is last
     * (if one exists).
     */
    set_last_default(ms, mset[j].me, mset[j].count);

    /* coalesce per file arrays into a single one, if needed */
    if (mset[j].count == 0)
      continue;

    if (coalesce_entries(ms, mset[j].me, mset[j].count,
        &map->magic[j], &map->nmagic[j]) == -1) {
      errs++;
      goto out;
    }
  }

out:
  free(filearr);
  for (j = 0; j < MAGIC_SETS; j++)
    magic_entry_free(mset[j].me, mset[j].count);

  if (errs) {
    apprentice_unmap(map);
    return NULL;
  }
  return map;
}

/*
 * extend the sign bit if the comparison is to be signed
 */
file_protected uint64_t
file_signextend(struct magic_set *ms, struct magic *m, uint64_t v)
{
  if (!(m->flag & UNSIGNED)) {
    switch(m->type) {
    /*
     * Do not remove the casts below.  They are
     * vital.  When later compared with the data,
     * the sign extension must have happened.
     */
    case FILE_BYTE:
      v = CAST(signed char,  v);
      break;
    case FILE_SHORT:
    case FILE_BESHORT:
    case FILE_LESHORT:
      v = CAST(short, v);
      break;
    case FILE_DATE:
    case FILE_BEDATE:
    case FILE_LEDATE:
    case FILE_MEDATE:
    case FILE_LDATE:
    case FILE_BELDATE:
    case FILE_LELDATE:
    case FILE_MELDATE:
    case FILE_LONG:
    case FILE_BELONG:
    case FILE_LELONG:
    case FILE_MELONG:
    case FILE_FLOAT:
    case FILE_BEFLOAT:
    case FILE_LEFLOAT:
    case FILE_MSDOSDATE:
    case FILE_BEMSDOSDATE:
    case FILE_LEMSDOSDATE:
    case FILE_MSDOSTIME:
    case FILE_BEMSDOSTIME:
    case FILE_LEMSDOSTIME:
      v = CAST(int32_t, v);
      break;
    case FILE_QUAD:
    case FILE_BEQUAD:
    case FILE_LEQUAD:
    case FILE_QDATE:
    case FILE_QLDATE:
    case FILE_QWDATE:
    case FILE_BEQDATE:
    case FILE_BEQLDATE:
    case FILE_BEQWDATE:
    case FILE_LEQDATE:
    case FILE_LEQLDATE:
    case FILE_LEQWDATE:
    case FILE_DOUBLE:
    case FILE_BEDOUBLE:
    case FILE_LEDOUBLE:
    case FILE_OFFSET:
    case FILE_BEVARINT:
    case FILE_LEVARINT:
      v = CAST(int64_t, v);
      break;
    case FILE_STRING:
    case FILE_PSTRING:
    case FILE_BESTRING16:
    case FILE_LESTRING16:
    case FILE_REGEX:
    case FILE_SEARCH:
    case FILE_DEFAULT:
    case FILE_INDIRECT:
    case FILE_NAME:
    case FILE_USE:
    case FILE_CLEAR:
    case FILE_DER:
    case FILE_GUID:
    case FILE_OCTAL:
      break;
    default:
      if (ms->flags & MAGIC_CHECK)
          file_magwarn(ms, "cannot happen: m->type=%d\n",
            m->type);
      return FILE_BADSIZE;
    }
  }
  return v;
}

file_private int
string_modifier_check(struct magic_set *ms, struct magic *m)
{
  if ((ms->flags & MAGIC_CHECK) == 0)
    return 0;

  if ((m->type != FILE_REGEX || (m->str_flags & REGEX_LINE_COUNT) == 0) &&
      (m->type != FILE_PSTRING && (m->str_flags & PSTRING_LEN) != 0)) {
    file_magwarn(ms,
        "'/BHhLl' modifiers are only allowed for pascal strings\n");
    return -1;
  }
  switch (m->type) {
  case FILE_BESTRING16:
  case FILE_LESTRING16:
    if (m->str_flags != 0) {
      file_magwarn(ms,
          "no modifiers allowed for 16-bit strings\n");
      return -1;
    }
    break;
  case FILE_STRING:
  case FILE_PSTRING:
    if ((m->str_flags & REGEX_OFFSET_START) != 0) {
      file_magwarn(ms,
          "'/%c' only allowed on regex and search\n",
          CHAR_REGEX_OFFSET_START);
      return -1;
    }
    break;
  case FILE_SEARCH:
    if (m->str_range == 0) {
      file_magwarn(ms,
          "missing range; defaulting to %d\n",
                            STRING_DEFAULT_RANGE);
      m->str_range = STRING_DEFAULT_RANGE;
      return -1;
    }
    break;
  case FILE_REGEX:
    if ((m->str_flags & STRING_COMPACT_WHITESPACE) != 0) {
      file_magwarn(ms, "'/%c' not allowed on regex\n",
          CHAR_COMPACT_WHITESPACE);
      return -1;
    }
    if ((m->str_flags & STRING_COMPACT_OPTIONAL_WHITESPACE) != 0) {
      file_magwarn(ms, "'/%c' not allowed on regex\n",
          CHAR_COMPACT_OPTIONAL_WHITESPACE);
      return -1;
    }
    break;
  default:
    file_magwarn(ms, "coding error: m->type=%d\n",
        m->type);
    return -1;
  }
  return 0;
}

file_private int
get_op(char c)
{
  switch (c) {
  case '&':
    return FILE_OPAND;
  case '|':
    return FILE_OPOR;
  case '^':
    return FILE_OPXOR;
  case '+':
    return FILE_OPADD;
  case '-':
    return FILE_OPMINUS;
  case '*':
    return FILE_OPMULTIPLY;
  case '/':
    return FILE_OPDIVIDE;
  case '%':
    return FILE_OPMODULO;
  default:
    return -1;
  }
}

#ifdef ENABLE_CONDITIONALS
file_private int
get_cond(const char *l, const char **t)
{
  static const struct cond_tbl_s {
    char name[8];
    size_t len;
    int cond;
  } cond_tbl[] = {
    { "if",   2,  COND_IF },
    { "elif", 4,  COND_ELIF },
    { "else", 4,  COND_ELSE },
    { "",   0,  COND_NONE },
  };
  const struct cond_tbl_s *p;

  for (p = cond_tbl; p->len; p++) {
    if (strncmp(l, p->name, p->len) == 0 &&
        isspace(CAST(unsigned char, l[p->len]))) {
      if (t)
        *t = l + p->len;
      break;
    }
  }
  return p->cond;
}

file_private int
check_cond(struct magic_set *ms, int cond, uint32_t cont_level)
{
  int last_cond;
  last_cond = ms->c.li[cont_level].last_cond;

  switch (cond) {
  case COND_IF:
    if (last_cond != COND_NONE && last_cond != COND_ELIF) {
      if (ms->flags & MAGIC_CHECK)
        file_magwarn(ms, "syntax error: `if'");
      return -1;
    }
    last_cond = COND_IF;
    break;

  case COND_ELIF:
    if (last_cond != COND_IF && last_cond != COND_ELIF) {
      if (ms->flags & MAGIC_CHECK)
        file_magwarn(ms, "syntax error: `elif'");
      return -1;
    }
    last_cond = COND_ELIF;
    break;

  case COND_ELSE:
    if (last_cond != COND_IF && last_cond != COND_ELIF) {
      if (ms->flags & MAGIC_CHECK)
        file_magwarn(ms, "syntax error: `else'");
      return -1;
    }
    last_cond = COND_NONE;
    break;

  case COND_NONE:
    last_cond = COND_NONE;
    break;
  }

  ms->c.li[cont_level].last_cond = last_cond;
  return 0;
}
#endif /* ENABLE_CONDITIONALS */

file_private int
parse_indirect_modifier(struct magic_set *ms, struct magic *m, const char **lp)
{
  const char *l = *lp;

  while (!isspace(CAST(unsigned char, *++l)))
    switch (*l) {
    case CHAR_INDIRECT_RELATIVE:
      m->str_flags |= INDIRECT_RELATIVE;
      break;
    default:
      if (ms->flags & MAGIC_CHECK)
        file_magwarn(ms, "indirect modifier `%c' "
          "invalid", *l);
      *lp = l;
      return -1;
    }
  *lp = l;
  return 0;
}

file_private void
parse_op_modifier(struct magic_set *ms, struct magic *m, const char **lp,
    int op)
{
  const char *l = *lp;
  char *t;
  uint64_t val;

  ++l;
  m->mask_op |= op;
  val = CAST(uint64_t, strtoull(l, &t, 0));
  l = t;
  m->num_mask = file_signextend(ms, m, val);
  eatsize(&l);
  *lp = l;
}

file_private int
parse_string_modifier(struct magic_set *ms, struct magic *m, const char **lp)
{
  const char *l = *lp;
  char *t;
  int have_range = 0;

  while (!isspace(CAST(unsigned char, *++l))) {
    switch (*l) {
    case '0':  case '1':  case '2':
    case '3':  case '4':  case '5':
    case '6':  case '7':  case '8':
    case '9':
      if (have_range && (ms->flags & MAGIC_CHECK))
        file_magwarn(ms, "multiple ranges");
      have_range = 1;
      m->str_range = CAST(uint32_t, strtoul(l, &t, 0));
      if (m->str_range == 0)
        file_magwarn(ms, "zero range");
      l = t - 1;
      break;
    case CHAR_COMPACT_WHITESPACE:
      m->str_flags |= STRING_COMPACT_WHITESPACE;
      break;
    case CHAR_COMPACT_OPTIONAL_WHITESPACE:
      m->str_flags |= STRING_COMPACT_OPTIONAL_WHITESPACE;
      break;
    case CHAR_IGNORE_LOWERCASE:
      m->str_flags |= STRING_IGNORE_LOWERCASE;
      break;
    case CHAR_IGNORE_UPPERCASE:
      m->str_flags |= STRING_IGNORE_UPPERCASE;
      break;
    case CHAR_REGEX_OFFSET_START:
      m->str_flags |= REGEX_OFFSET_START;
      break;
    case CHAR_BINTEST:
      m->str_flags |= STRING_BINTEST;
      break;
    case CHAR_TEXTTEST:
      m->str_flags |= STRING_TEXTTEST;
      break;
    case CHAR_TRIM:
      m->str_flags |= STRING_TRIM;
      break;
    case CHAR_FULL_WORD:
      m->str_flags |= STRING_FULL_WORD;
      break;
    case CHAR_PSTRING_1_LE:
#define SET_LENGTH(a) m->str_flags = (m->str_flags & ~PSTRING_LEN) | (a)
      if (m->type != FILE_PSTRING)
        goto bad;
      SET_LENGTH(PSTRING_1_LE);
      break;
    case CHAR_PSTRING_2_BE:
      if (m->type != FILE_PSTRING)
        goto bad;
      SET_LENGTH(PSTRING_2_BE);
      break;
    case CHAR_PSTRING_2_LE:
      if (m->type != FILE_PSTRING)
        goto bad;
      SET_LENGTH(PSTRING_2_LE);
      break;
    case CHAR_PSTRING_4_BE:
      if (m->type != FILE_PSTRING)
        goto bad;
      SET_LENGTH(PSTRING_4_BE);
      break;
    case CHAR_PSTRING_4_LE:
      switch (m->type) {
      case FILE_PSTRING:
      case FILE_REGEX:
        break;
      default:
        goto bad;
      }
      SET_LENGTH(PSTRING_4_LE);
      break;
    case CHAR_PSTRING_LENGTH_INCLUDES_ITSELF:
      if (m->type != FILE_PSTRING)
        goto bad;
      m->str_flags |= PSTRING_LENGTH_INCLUDES_ITSELF;
      break;
    default:
    bad:
      if (ms->flags & MAGIC_CHECK)
        file_magwarn(ms, "string modifier `%c' "
          "invalid", *l);
      goto out;
    }
    /* allow multiple '/' for readability */
    if (l[1] == '/' && !isspace(CAST(unsigned char, l[2])))
      l++;
  }
  if (string_modifier_check(ms, m) == -1)
    goto out;
  *lp = l;
  return 0;
out:
  *lp = l;
  return -1;
}

/*
 * parse one line from magic file, put into magic[index++] if valid
 */
file_private int
parse(struct magic_set *ms, struct magic_entry *me, const char *line,
    size_t lineno, int action)
{
#ifdef ENABLE_CONDITIONALS
  static uint32_t last_cont_level = 0;
#endif
  size_t i;
  struct magic *m;
  const char *l = line;
  char *t;
  int op;
  uint32_t cont_level;
  int32_t diff;

  cont_level = 0;

  /*
   * Parse the offset.
   */
  while (*l == '>') {
    ++l;    /* step over */
    cont_level++;
  }
#ifdef ENABLE_CONDITIONALS
  if (cont_level == 0 || cont_level > last_cont_level)
    if (file_check_mem(ms, cont_level) == -1)
      return -1;
  last_cont_level = cont_level;
#endif
  if (cont_level != 0) {
    if (me->mp == NULL) {
      file_magerror(ms, "No current entry for continuation");
      return -1;
    }
    if (me->cont_count == 0) {
      file_magerror(ms, "Continuations present with 0 count");
      return -1;
    }
    m = &me->mp[me->cont_count - 1];
    diff = CAST(int32_t, cont_level) - CAST(int32_t, m->cont_level);
    if (diff > 1)
      file_magwarn(ms, "New continuation level %u is more "
          "than one larger than current level %u", cont_level,
          m->cont_level);
    if (me->cont_count == me->max_count) {
      struct magic *nm;
      size_t cnt = me->max_count + ALLOC_CHUNK;
      if ((nm = CAST(struct magic *, realloc(me->mp,
          sizeof(*nm) * cnt))) == NULL) {
        file_oomem(ms, sizeof(*nm) * cnt);
        return -1;
      }
      me->mp = nm;
      me->max_count = CAST(uint32_t, cnt);
    }
    m = &me->mp[me->cont_count++];
    (void)memset(m, 0, sizeof(*m));
    m->cont_level = cont_level;
  } else {
    static const size_t len = sizeof(*m) * ALLOC_CHUNK;
    if (me->mp != NULL)
      return 1;
    if ((m = CAST(struct magic *, malloc(len))) == NULL) {
      file_oomem(ms, len);
      return -1;
    }
    me->mp = m;
    me->max_count = ALLOC_CHUNK;
    (void)memset(m, 0, sizeof(*m));
    m->factor_op = FILE_FACTOR_OP_NONE;
    m->cont_level = 0;
    me->cont_count = 1;
  }
  m->lineno = CAST(uint32_t, lineno);

  if (*l == '&') {  /* m->cont_level == 0 checked below. */
                ++l;            /* step over */
                m->flag |= OFFADD;
        }
  if (*l == '(') {
    ++l;    /* step over */
    m->flag |= INDIR;
    if (m->flag & OFFADD)
      m->flag = (m->flag & ~OFFADD) | INDIROFFADD;

    if (*l == '&') {  /* m->cont_level == 0 checked below */
      ++l;            /* step over */
      m->flag |= OFFADD;
    }
  }
  /* Indirect offsets are not valid at level 0. */
  if (m->cont_level == 0 && (m->flag & (OFFADD | INDIROFFADD))) {
    if (ms->flags & MAGIC_CHECK)
      file_magwarn(ms, "relative offset at level 0");
    return -1;
  }

  /* get offset, then skip over it */
  if (*l == '-') {
    ++l;            /* step over */
    m->flag |= OFFNEGATIVE;
  }
  m->offset = CAST(int32_t, strtol(l, &t, 0));
        if (l == t) {
    if (ms->flags & MAGIC_CHECK)
      file_magwarn(ms, "offset `%s' invalid", l);
    return -1;
  }

        l = t;

  if (m->flag & INDIR) {
    m->in_type = FILE_LONG;
    m->in_offset = 0;
    m->in_op = 0;
    /*
     * read [.,lbs][+-]nnnnn)
     */
    if (*l == '.' || *l == ',') {
      if (*l == ',')
        m->in_op |= FILE_OPSIGNED;
      l++;
      switch (*l) {
      case 'l':
        m->in_type = FILE_LELONG;
        break;
      case 'L':
        m->in_type = FILE_BELONG;
        break;
      case 'm':
        m->in_type = FILE_MELONG;
        break;
      case 'h':
      case 's':
        m->in_type = FILE_LESHORT;
        break;
      case 'H':
      case 'S':
        m->in_type = FILE_BESHORT;
        break;
      case 'c':
      case 'b':
      case 'C':
      case 'B':
        m->in_type = FILE_BYTE;
        break;
      case 'e':
      case 'f':
      case 'g':
        m->in_type = FILE_LEDOUBLE;
        break;
      case 'E':
      case 'F':
      case 'G':
        m->in_type = FILE_BEDOUBLE;
        break;
      case 'i':
        m->in_type = FILE_LEID3;
        break;
      case 'I':
        m->in_type = FILE_BEID3;
        break;
      case 'o':
        m->in_type = FILE_OCTAL;
        break;
      case 'q':
        m->in_type = FILE_LEQUAD;
        break;
      case 'Q':
        m->in_type = FILE_BEQUAD;
        break;
      default:
        if (ms->flags & MAGIC_CHECK)
          file_magwarn(ms,
              "indirect offset type `%c' invalid",
              *l);
        return -1;
      }
      l++;
    }

    if (*l == '~') {
      m->in_op |= FILE_OPINVERSE;
      l++;
    }
    if ((op = get_op(*l)) != -1) {
      m->in_op |= op;
      l++;
    }
    if (*l == '(') {
      m->in_op |= FILE_OPINDIRECT;
      l++;
    }
    if (isdigit(CAST(unsigned char, *l)) || *l == '-') {
      m->in_offset = CAST(int32_t, strtol(l, &t, 0));
      if (l == t) {
        if (ms->flags & MAGIC_CHECK)
          file_magwarn(ms,
              "in_offset `%s' invalid", l);
        return -1;
      }
      l = t;
    }
    if (*l++ != ')' ||
        ((m->in_op & FILE_OPINDIRECT) && *l++ != ')')) {
      if (ms->flags & MAGIC_CHECK)
        file_magwarn(ms,
            "missing ')' in indirect offset");
      return -1;
    }
  }
  EATAB;

#ifdef ENABLE_CONDITIONALS
  m->cond = get_cond(l, &l);
  if (check_cond(ms, m->cond, cont_level) == -1)
    return -1;

  EATAB;
#endif

  /*
   * Parse the type.
   */
  if (*l == 'u') {
    /*
     * Try it as a keyword type prefixed by "u"; match what
     * follows the "u".  If that fails, try it as an SUS
     * integer type.
     */
    m->type = get_type(type_tbl, l + 1, &l);
    if (m->type == FILE_INVALID) {
      /*
       * Not a keyword type; parse it as an SUS type,
       * 'u' possibly followed by a number or C/S/L.
       */
      m->type = get_standard_integer_type(l, &l);
    }
    /* It's unsigned. */
    if (m->type != FILE_INVALID)
      m->flag |= UNSIGNED;
  } else {
    /*
     * Try it as a keyword type.  If that fails, try it as
     * an SUS integer type if it begins with "d" or as an
     * SUS string type if it begins with "s".  In any case,
     * it's not unsigned.
     */
    m->type = get_type(type_tbl, l, &l);
    if (m->type == FILE_INVALID) {
      /*
       * Not a keyword type; parse it as an SUS type,
       * either 'd' possibly followed by a number or
       * C/S/L, or just 's'.
       */
      if (*l == 'd')
        m->type = get_standard_integer_type(l, &l);
      else if (*l == 's'
          && !isalpha(CAST(unsigned char, l[1]))) {
        m->type = FILE_STRING;
        ++l;
      }
    }
  }

  if (m->type == FILE_INVALID) {
    /* Not found - try it as a special keyword. */
    m->type = get_type(special_tbl, l, &l);
  }

  if (m->type == FILE_INVALID) {
    if (ms->flags & MAGIC_CHECK)
      file_magwarn(ms, "type `%s' invalid", l);
    return -1;
  }

  if (m->type == FILE_NAME && cont_level != 0) {
    if (ms->flags & MAGIC_CHECK)
      file_magwarn(ms, "`name%s' entries can only be "
          "declared at top level", l);
    return -1;
  }

  /* New-style anding: "0 byte&0x80 =0x80 dynamically linked" */
  /* New and improved: ~ & | ^ + - * / % -- exciting, isn't it? */

  m->mask_op = 0;
  if (*l == '~') {
    if (!IS_STRING(m->type))
      m->mask_op |= FILE_OPINVERSE;
    else if (ms->flags & MAGIC_CHECK)
      file_magwarn(ms, "'~' invalid for string types");
    ++l;
  }
  m->str_range = 0;
  m->str_flags = m->type == FILE_PSTRING ? PSTRING_1_LE : 0;
  if ((op = get_op(*l)) != -1) {
    if (IS_STRING(m->type)) {
      int r;

      if (op != FILE_OPDIVIDE) {
        if (ms->flags & MAGIC_CHECK)
          file_magwarn(ms,
              "invalid string/indirect op: "
              "`%c'", *t);
        return -1;
      }

      if (m->type == FILE_INDIRECT)
        r = parse_indirect_modifier(ms, m, &l);
      else
        r = parse_string_modifier(ms, m, &l);
      if (r == -1)
        return -1;
    } else
      parse_op_modifier(ms, m, &l, op);
  }

  /*
   * We used to set mask to all 1's here, instead let's just not do
   * anything if mask = 0 (unless you have a better idea)
   */
  EATAB;

  switch (*l) {
  case '>':
  case '<':
      m->reln = *l;
      ++l;
    if (*l == '=') {
      if (ms->flags & MAGIC_CHECK) {
        file_magwarn(ms, "%c= not supported",
            m->reln);
        return -1;
      }
       ++l;
    }
    break;
  /* Old-style anding: "0 byte &0x80 dynamically linked" */
  case '&':
  case '^':
  case '=':
      m->reln = *l;
      ++l;
    if (*l == '=') {
       /* HP compat: ignore &= etc. */
       ++l;
    }
    break;
  case '!':
    m->reln = *l;
    ++l;
    break;
  default:
      m->reln = '=';  /* the default relation */
    if (*l == 'x' && ((isascii(CAST(unsigned char, l[1])) &&
        isspace(CAST(unsigned char, l[1]))) || !l[1])) {
      m->reln = *l;
      ++l;
    }
    break;
  }
  /*
   * Grab the value part, except for an 'x' reln.
   */
  if (m->reln != 'x' && getvalue(ms, m, &l, action))
    return -1;

  /*
   * TODO finish this macro and start using it!
   * #define offsetcheck {if (offset > ms->bytes_max -1)
   *  magwarn("offset too big"); }
   */

  /*
   * Now get last part - the description
   */
  EATAB;
  if (l[0] == '\b') {
    ++l;
    m->flag |= NOSPACE;
  } else if ((l[0] == '\\') && (l[1] == 'b')) {
    ++l;
    ++l;
    m->flag |= NOSPACE;
  }
  for (i = 0; (m->desc[i++] = *l++) != '\0' && i < sizeof(m->desc); )
    continue;
  if (i == sizeof(m->desc)) {
    m->desc[sizeof(m->desc) - 1] = '\0';
    if (ms->flags & MAGIC_CHECK)
      file_magwarn(ms, "description `%s' truncated", m->desc);
  }

        /*
   * We only do this check while compiling, or if any of the magic
   * files were not compiled.
         */
        if (ms->flags & MAGIC_CHECK) {
    if (check_format(ms, m) == -1)
      return -1;
  }
#ifndef COMPILE_ONLY
  if (action == FILE_CHECK) {
    file_mdump(m);
  }
#endif
  m->mimetype[0] = '\0';    /* initialise MIME type to none */
  return 0;
}

/*
 * parse a STRENGTH annotation line from magic file, put into magic[index - 1]
 * if valid
 */
/*ARGSUSED*/
file_private int
parse_strength(struct magic_set *ms, struct magic_entry *me, const char *line,
    size_t len __attribute__((__unused__)))
{
  const char *l = line;
  char *el;
  unsigned long factor;
  char sbuf[512];
  struct magic *m = &me->mp[0];

  if (m->factor_op != FILE_FACTOR_OP_NONE) {
    file_magwarn(ms,
        "Current entry already has a strength type: %c %d",
        m->factor_op, m->factor);
    return -1;
  }
  if (m->type == FILE_NAME) {
    file_magwarn(ms, "%s: Strength setting is not supported in "
        "\"name\" magic entries",
        file_printable(ms, sbuf, sizeof(sbuf), m->value.s,
        sizeof(m->value.s)));
    return -1;
  }
  EATAB;
  switch (*l) {
  case FILE_FACTOR_OP_NONE:
    break;
  case FILE_FACTOR_OP_PLUS:
  case FILE_FACTOR_OP_MINUS:
  case FILE_FACTOR_OP_TIMES:
  case FILE_FACTOR_OP_DIV:
    m->factor_op = *l++;
    break;
  default:
    file_magwarn(ms, "Unknown factor op `%c'", *l);
    return -1;
  }
  EATAB;
  factor = strtoul(l, &el, 0);
  if (factor > 255) {
    file_magwarn(ms, "Too large factor `%lu'", factor);
    goto out;
  }
  if (*el && !isspace(CAST(unsigned char, *el))) {
    file_magwarn(ms, "Bad factor `%s'", l);
    goto out;
  }
  m->factor = CAST(uint8_t, factor);
  if (m->factor == 0 && m->factor_op == FILE_FACTOR_OP_DIV) {
    file_magwarn(ms, "Cannot have factor op `%c' and factor %u",
        m->factor_op, m->factor);
    goto out;
  }
  return 0;
out:
  m->factor_op = FILE_FACTOR_OP_NONE;
  m->factor = 0;
  return -1;
}

file_private int
goodchar(unsigned char x, const char *extra)
{
  return (isascii(x) && isalnum(x)) || strchr(extra, x);
}

file_private int
parse_extra(struct magic_set *ms, struct magic_entry *me, const char *line,
    size_t llen, off_t off, size_t len, const char *name, const char *extra,
    int nt)
{
  size_t i;
  const char *l = line;
  struct magic *m = &me->mp[me->cont_count == 0 ? 0 : me->cont_count - 1];
  char *buf = CAST(char *, CAST(void *, m)) + off;

  if (buf[0] != '\0') {
    len = nt ? strlen(buf) : len;
    file_magwarn(ms, "Current entry already has a %s type "
        "`%.*s', new type `%s'", name, CAST(int, len), buf, l);
    return -1;
  }

  if (*m->desc == '\0') {
    file_magwarn(ms, "Current entry does not yet have a "
        "description for adding a %s type", name);
    return -1;
  }

  EATAB;
  for (i = 0; *l && i < llen && i < len && goodchar(*l, extra);
      buf[i++] = *l++)
    continue;

  if (i == len && *l) {
    if (nt)
      buf[len - 1] = '\0';
    if (ms->flags & MAGIC_CHECK)
      file_magwarn(ms, "%s type `%s' truncated %"
          SIZE_T_FORMAT "u", name, line, i);
  } else {
    if (!isspace(CAST(unsigned char, *l)) && !goodchar(*l, extra))
      file_magwarn(ms, "%s type `%s' has bad char '%c'",
          name, line, *l);
    if (nt)
      buf[i] = '\0';
  }

  if (i > 0)
    return 0;

  file_magerror(ms, "Bad magic entry '%s'", line);
  return -1;
}

/*
 * Parse an Apple CREATOR/TYPE annotation from magic file and put it into
 * magic[index - 1]
 */
file_private int
parse_apple(struct magic_set *ms, struct magic_entry *me, const char *line,
    size_t len)
{
  return parse_extra(ms, me, line, len,
      CAST(off_t, offsetof(struct magic, apple)),
      sizeof(me->mp[0].apple), "APPLE", "!+-./?", 0);
}

/*
 * Parse a comma-separated list of extensions
 */
file_private int
parse_ext(struct magic_set *ms, struct magic_entry *me, const char *line,
    size_t len)
{
  return parse_extra(ms, me, line, len,
      CAST(off_t, offsetof(struct magic, ext)),
      sizeof(me->mp[0].ext), "EXTENSION", ",!+-/@?_$&~", 0);
      /* & for b&w */
      /* ~ for journal~ */
}

/*
 * parse a MIME annotation line from magic file, put into magic[index - 1]
 * if valid
 */
file_private int
parse_mime(struct magic_set *ms, struct magic_entry *me, const char *line,
    size_t len)
{
  return parse_extra(ms, me, line, len,
      CAST(off_t, offsetof(struct magic, mimetype)),
      sizeof(me->mp[0].mimetype), "MIME", "+-/.$?:{}", 1);
}

file_private int
check_format_type(const char *ptr, int type, const char **estr)
{
  int quad = 0, h;
  size_t len, cnt;
  if (*ptr == '\0') {
    /* Missing format string; bad */
    *estr = "missing format spec";
    return -1;
  }

  switch (file_formats[type]) {
  case FILE_FMT_QUAD:
    quad = 1;
    /*FALLTHROUGH*/
  case FILE_FMT_NUM:
    if (quad == 0) {
      switch (type) {
      case FILE_BYTE:
        h = 2;
        break;
      case FILE_SHORT:
      case FILE_BESHORT:
      case FILE_LESHORT:
        h = 1;
        break;
      case FILE_LONG:
      case FILE_BELONG:
      case FILE_LELONG:
      case FILE_MELONG:
      case FILE_LEID3:
      case FILE_BEID3:
      case FILE_INDIRECT:
        h = 0;
        break;
      default:
        fprintf(stderr, "Bad number format %d", type);
        abort();
      }
    } else
      h = 0;
    while (*ptr && strchr("-.#", *ptr) != NULL)
      ptr++;
#define CHECKLEN() do { \
  for (len = cnt = 0; isdigit(CAST(unsigned char, *ptr)); ptr++, cnt++) \
    len = len * 10 + (*ptr - '0'); \
  if (cnt > 5 || len > 1024) \
    goto toolong; \
} while (/*CONSTCOND*/0)

    CHECKLEN();
    if (*ptr == '.')
      ptr++;
    CHECKLEN();
    if (quad) {
      if (*ptr++ != 'l')
        goto invalid;
      if (*ptr++ != 'l')
        goto invalid;
    }

    switch (*ptr++) {
#ifdef STRICT_FORMAT  /* "long" formats are int formats for us */
    /* so don't accept the 'l' modifier */
    case 'l':
      switch (*ptr++) {
      case 'i':
      case 'd':
      case 'u':
      case 'o':
      case 'x':
      case 'X':
        if (h == 0)
          return 0;
        /*FALLTHROUGH*/
      default:
        goto invalid;
      }

    /*
     * Don't accept h and hh modifiers. They make writing
     * magic entries more complicated, for very little benefit
     */
    case 'h':
      if (h-- <= 0)
        goto invalid;
      switch (*ptr++) {
      case 'h':
        if (h-- <= 0)
          goto invalid;
        switch (*ptr++) {
        case 'i':
        case 'd':
        case 'u':
        case 'o':
        case 'x':
        case 'X':
          return 0;
        default:
          goto invalid;
        }
      case 'i':
      case 'd':
      case 'u':
      case 'o':
      case 'x':
      case 'X':
        if (h == 0)
          return 0;
        /*FALLTHROUGH*/
      default:
        goto invalid;
      }
#endif
    case 'c':
      if (h == 2)
        return 0;
      goto invalid;
    case 'i':
    case 'd':
    case 'u':
    case 'o':
    case 'x':
    case 'X':
#ifdef STRICT_FORMAT
      if (h == 0)
        return 0;
      /*FALLTHROUGH*/
#else
      return 0;
#endif
    default:
      goto invalid;
    }

  case FILE_FMT_FLOAT:
  case FILE_FMT_DOUBLE:
    if (*ptr == '-')
      ptr++;
    if (*ptr == '.')
      ptr++;
    CHECKLEN();
    if (*ptr == '.')
      ptr++;
    CHECKLEN();
    switch (*ptr++) {
    case 'e':
    case 'E':
    case 'f':
    case 'F':
    case 'g':
    case 'G':
      return 0;

    default:
      goto invalid;
    }


  case FILE_FMT_STR:
    if (*ptr == '-')
      ptr++;
    while (isdigit(CAST(unsigned char, *ptr)))
      ptr++;
    if (*ptr == '.') {
      ptr++;
      while (isdigit(CAST(unsigned char , *ptr)))
        ptr++;
    }

    switch (*ptr++) {
    case 's':
      return 0;
    default:
      goto invalid;
    }

  default:
    /* internal error */
    fprintf(stderr, "Bad file format %d", type);
    abort();
  }
invalid:
  *estr = "not valid";
  return -1;
toolong:
  *estr = "too long";
  return -1;
}

/*
 * Check that the optional printf format in description matches
 * the type of the magic.
 */
file_private int
check_format(struct magic_set *ms, struct magic *m)
{
  char *ptr;
  const char *estr;

  for (ptr = m->desc; *ptr; ptr++)
    if (*ptr == '%')
      break;
  if (*ptr == '\0') {
    /* No format string; ok */
    return 1;
  }

  assert(file_nformats == file_nnames);

  if (m->type >= file_nformats) {
    file_magwarn(ms, "Internal error inconsistency between "
        "m->type and format strings");
    return -1;
  }
  if (file_formats[m->type] == FILE_FMT_NONE) {
    file_magwarn(ms, "No format string for `%s' with description "
        "`%s'", m->desc, file_names[m->type]);
    return -1;
  }

  ptr++;
  if (check_format_type(ptr, m->type, &estr) == -1) {
    /*
     * TODO: this error message is unhelpful if the format
     * string is not one character long
     */
    file_magwarn(ms, "Printf format is %s for type "
        "`%s' in description `%s'", estr,
        file_names[m->type], m->desc);
    return -1;
  }

  for (; *ptr; ptr++) {
    if (*ptr == '%') {
      file_magwarn(ms,
          "Too many format strings (should have at most one) "
          "for `%s' with description `%s'",
          file_names[m->type], m->desc);
      return -1;
    }
  }
  return 0;
}

/*
 * Read a numeric value from a pointer, into the value union of a magic
 * pointer, according to the magic type.  Update the string pointer to point
 * just after the number read.  Return 0 for success, non-zero for failure.
 */
file_private int
getvalue(struct magic_set *ms, struct magic *m, const char **p, int action)
{
  char *ep;
  uint64_t ull;
  int y;

  switch (m->type) {
  case FILE_BESTRING16:
  case FILE_LESTRING16:
  case FILE_STRING:
  case FILE_PSTRING:
  case FILE_REGEX:
  case FILE_SEARCH:
  case FILE_NAME:
  case FILE_USE:
  case FILE_DER:
  case FILE_OCTAL:
    *p = getstr(ms, m, *p, action == FILE_COMPILE);
    if (*p == NULL) {
      if (ms->flags & MAGIC_CHECK)
        file_magwarn(ms, "cannot get string from `%s'",
            m->value.s);
      return -1;
    }
    if (m->type == FILE_REGEX) {
      file_regex_t rx;
      int rc =
          file_regcomp(ms, &rx, m->value.s, REG_EXTENDED);
      if (rc == 0) {
        file_regfree(&rx);
      }
      return rc ? -1 : 0;
    }
    return 0;
  default:
    if (m->reln == 'x')
      return 0;
    break;
  }

  switch (m->type) {
  case FILE_FLOAT:
  case FILE_BEFLOAT:
  case FILE_LEFLOAT:
    errno = 0;
#ifdef HAVE_STRTOF
    m->value.f = strtof(*p, &ep);
#else
    m->value.f = (float)strtod(*p, &ep);
#endif
    if (errno == 0)
      *p = ep;
    return 0;
  case FILE_DOUBLE:
  case FILE_BEDOUBLE:
  case FILE_LEDOUBLE:
    errno = 0;
    m->value.d = strtod(*p, &ep);
    if (errno == 0)
      *p = ep;
    return 0;
  case FILE_GUID:
    if (file_parse_guid(*p, m->value.guid) == -1)
      return -1;
    *p += FILE_GUID_SIZE - 1;
    return 0;
  default:
    errno = 0;
    ull = CAST(uint64_t, strtoull(*p, &ep, 0));
    m->value.q = file_signextend(ms, m, ull);
    if (*p == ep) {
      file_magwarn(ms, "Unparsable number `%s'", *p);
      return -1;
    } else {
      size_t ts = typesize(m->type);
      uint64_t x;
      const char *q;

      if (ts == FILE_BADSIZE) {
        file_magwarn(ms,
            "Expected numeric type got `%s'",
            type_tbl[m->type].name);
        return -1;
      }
      for (q = *p; isspace(CAST(unsigned char, *q)); q++)
        continue;
      if (*q == '-' && ull != UINT64_MAX)
        ull = -CAST(int64_t, ull);
      switch (ts) {
      case 1:
        x = CAST(uint64_t, ull & ~0xffULL);
        y = (x & ~0xffULL) != ~0xffULL;
        break;
      case 2:
        x = CAST(uint64_t, ull & ~0xffffULL);
        y = (x & ~0xffffULL) != ~0xffffULL;
        break;
      case 4:
        x = CAST(uint64_t, ull & ~0xffffffffULL);
        y = (x & ~0xffffffffULL) != ~0xffffffffULL;
        break;
      case 8:
        x = 0;
        y = 0;
        break;
      default:
        fprintf(stderr, "Bad width %zu", ts);
        abort();
      }
      if (x && y) {
        file_magwarn(ms, "Overflow for numeric"
            " type `%s' value %#" PRIx64,
            type_tbl[m->type].name, ull);
        return -1;
      }
    }
    if (errno == 0) {
      *p = ep;
      eatsize(p);
    }
    return 0;
  }
}

/*
 * Convert a string containing C character escapes.  Stop at an unescaped
 * space or tab.
 * Copy the converted version to "m->value.s", and the length in m->vallen.
 * Return updated scan pointer as function result. Warn if set.
 */
file_private const char *
getstr(struct magic_set *ms, struct magic *m, const char *s, int warn)
{
  const char *origs = s;
  char  *p = m->value.s;
  size_t  plen = sizeof(m->value.s);
  char  *origp = p;
  char  *pmax = p + plen - 1;
  int c;
  int val;
  size_t  bracket_nesting = 0;

  while ((c = *s++) != '\0') {
    if (isspace(CAST(unsigned char, c)))
      break;
    if (p >= pmax) {
      file_error(ms, 0, "string too long: `%s'", origs);
      return NULL;
    }
    if (c != '\\') {
        if (c == '[') {
          bracket_nesting++;
        }
        if (c == ']' && bracket_nesting > 0) {
          bracket_nesting--;
        }
        *p++ = CAST(char, c);
        continue;
    }
    switch(c = *s++) {

    case '\0':
      if (warn)
        file_magwarn(ms, "incomplete escape");
      s--;
      goto out;
    case '.':
      if (m->type == FILE_REGEX &&
          bracket_nesting == 0 && warn) {
        file_magwarn(ms, "escaped dot ('.') found, "
            "use \\\\. instead");
      }
      warn = 0; /* already did */
      /*FALLTHROUGH*/
    case '\t':
      if (warn) {
        file_magwarn(ms,
            "escaped tab found, use \\\\t instead");
        warn = 0; /* already did */
      }
      /*FALLTHROUGH*/
    default:
      if (warn) {
        if (isprint(CAST(unsigned char, c))) {
          /* Allow escaping of
           * ``relations'' */
          if (strchr("<>&^=!", c) == NULL
              && (m->type != FILE_REGEX ||
              strchr("[]().*?^$|{}", c)
              == NULL)) {
            file_magwarn(ms, "no "
                "need to escape "
                "`%c'", c);
          }
        } else {
          file_magwarn(ms,
              "unknown escape sequence: "
              "\\%03o", c);
        }
      }
      /*FALLTHROUGH*/
    /* space, perhaps force people to use \040? */
    case ' ':
#if 0
    /*
     * Other things people escape, but shouldn't need to,
     * so we disallow them
     */
    case '\'':
    case '"':
    case '?':
#endif
    /* Relations */
    case '>':
    case '<':
    case '&':
    case '^':
    case '=':
    case '!':
    /* and backslash itself */
    case '\\':
      *p++ = CAST(char, c);
      break;

    case 'a':
      *p++ = '\a';
      break;

    case 'b':
      *p++ = '\b';
      break;

    case 'f':
      *p++ = '\f';
      break;

    case 'n':
      *p++ = '\n';
      break;

    case 'r':
      *p++ = '\r';
      break;

    case 't':
      *p++ = '\t';
      break;

    case 'v':
      *p++ = '\v';
      break;

    /* \ and up to 3 octal digits */
    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
      val = c - '0';
      c = *s++;  /* try for 2 */
      if (c >= '0' && c <= '7') {
        val = (val << 3) | (c - '0');
        c = *s++;  /* try for 3 */
        if (c >= '0' && c <= '7')
          val = (val << 3) | (c-'0');
        else
          --s;
      }
      else
        --s;
      *p++ = CAST(char, val);
      break;

    /* \x and up to 2 hex digits */
    case 'x':
      val = 'x';  /* Default if no digits */
      c = hextoint(*s++); /* Get next char */
      if (c >= 0) {
        val = c;
        c = hextoint(*s++);
        if (c >= 0)
          val = (val << 4) + c;
        else
          --s;
      } else
        --s;
      *p++ = CAST(char, val);
      break;
    }
  }
  --s;
out:
  *p = '\0';
  m->vallen = CAST(unsigned char, (p - origp));
  if (m->type == FILE_PSTRING) {
    size_t l =  file_pstring_length_size(ms, m);
    if (l == FILE_BADSIZE)
      return NULL;
    m->vallen += CAST(unsigned char, l);
  }
  return s;
}


/* Single hex char to int; -1 if not a hex char. */
file_private int
hextoint(int c)
{
  if (!isascii(CAST(unsigned char, c)))
    return -1;
  if (isdigit(CAST(unsigned char, c)))
    return c - '0';
  if ((c >= 'a') && (c <= 'f'))
    return c + 10 - 'a';
  if (( c>= 'A') && (c <= 'F'))
    return c + 10 - 'A';
  return -1;
}


/*
 * Print a string containing C character escapes.
 */
file_protected void
file_showstr(FILE *fp, const char *s, size_t len)
{
  char  c;

  for (;;) {
    if (len == FILE_BADSIZE) {
      c = *s++;
      if (c == '\0')
        break;
    }
    else  {
      if (len-- == 0)
        break;
      c = *s++;
    }
    if (c >= 040 && c <= 0176) /* TODO isprint && !iscntrl */
      (void) fputc(c, fp);
    else {
      (void) fputc('\\', fp);
      switch (c) {
      case '\a':
        (void) fputc('a', fp);
        break;

      case '\b':
        (void) fputc('b', fp);
        break;

      case '\f':
        (void) fputc('f', fp);
        break;

      case '\n':
        (void) fputc('n', fp);
        break;

      case '\r':
        (void) fputc('r', fp);
        break;

      case '\t':
        (void) fputc('t', fp);
        break;

      case '\v':
        (void) fputc('v', fp);
        break;

      default:
        (void) fprintf(fp, "%.3o", c & 0377);
        break;
      }
    }
  }
}

/*
 * eatsize(): Eat the size spec from a number [eg. 10UL]
 */
file_private void
eatsize(const char **p)
{
  const char *l = *p;

  if (LOWCASE(*l) == 'u')
    l++;

  switch (LOWCASE(*l)) {
  case 'l':    /* long */
  case 's':    /* short */
  case 'h':    /* short */
  case 'b':    /* char/byte */
  case 'c':    /* char/byte */
    l++;
    /*FALLTHROUGH*/
  default:
    break;
  }

  *p = l;
}

/*
 * handle a buffer containing a compiled file.
 */
file_private struct magic_map *
apprentice_buf(struct magic_set *ms, struct magic *buf, size_t len)
{
  struct magic_map *map;

  if ((map = CAST(struct magic_map *, calloc(1, sizeof(*map)))) == NULL) {
    file_oomem(ms, sizeof(*map));
    return NULL;
  }
  map->len = len;
  map->p = buf;
  map->type = MAP_TYPE_USER;
  if (check_buffer(ms, map, "buffer") != 0) {
    apprentice_unmap(map);
    return NULL;
  }
  return map;
}

/*
 * handle a compiled file.
 */

file_private struct magic_map *
apprentice_map(struct magic_set *ms, const char *fn)
{
  int fd;
  struct stat st;
  char *dbname = NULL;
  struct magic_map *map;
  struct magic_map *rv = NULL;

  fd = -1;
  if ((map = CAST(struct magic_map *, calloc(1, sizeof(*map)))) == NULL) {
    file_oomem(ms, sizeof(*map));
    goto error;
  }
  map->type = MAP_TYPE_USER; /* unspecified */

  dbname = mkdbname(ms, fn, 0);
  if (dbname == NULL)
    goto error;

  if ((fd = open(dbname, O_RDONLY|O_BINARY)) == -1)
    goto error;

  if (fstat(fd, &st) == -1) {
    file_error(ms, errno, "cannot stat `%s'", dbname);
    goto error;
  }
  if (st.st_size < 8 || st.st_size > maxoff_t()) {
    file_error(ms, 0, "file `%s' is too %s", dbname,
        st.st_size < 8 ? "small" : "large");
    goto error;
  }

  map->len = CAST(size_t, st.st_size);
#ifdef QUICK
  map->type = MAP_TYPE_MMAP;
  if ((map->p = mmap(0, CAST(size_t, st.st_size), PROT_READ|PROT_WRITE,
      MAP_PRIVATE|MAP_FILE, fd, CAST(off_t, 0))) == MAP_FAILED) {
    file_error(ms, errno, "cannot map `%s'", dbname);
    goto error;
  }
#else
  map->type = MAP_TYPE_MALLOC;
  if ((map->p = CAST(void *, malloc(map->len))) == NULL) {
    file_oomem(ms, map->len);
    goto error;
  }
  if (read(fd, map->p, map->len) != (ssize_t)map->len) {
    file_badread(ms);
    goto error;
  }
#endif
  (void)close(fd);
  fd = -1;

  if (check_buffer(ms, map, dbname) != 0) {
    goto error;
  }
#ifdef QUICK
  if (mprotect(map->p, CAST(size_t, st.st_size), PROT_READ) == -1) {
    file_error(ms, errno, "cannot mprotect `%s'", dbname);
    goto error;
  }
#endif

  free(dbname);
  return map;

error:
  if (fd != -1)
    (void)close(fd);
  apprentice_unmap(map);
  free(dbname);
  return rv;
}

file_private int
check_buffer(struct magic_set *ms, struct magic_map *map, const char *dbname)
{
  uint32_t *ptr;
  uint32_t entries, nentries;
  uint32_t version;
  int i, needsbyteswap;

  ptr = CAST(uint32_t *, map->p);
  if (*ptr != MAGICNO) {
    if (swap4(*ptr) != MAGICNO) {
      file_error(ms, 0, "bad magic in `%s'", dbname);
      return -1;
    }
    needsbyteswap = 1;
  } else
    needsbyteswap = 0;
  if (needsbyteswap)
    version = swap4(ptr[1]);
  else
    version = ptr[1];
  if (version != VERSIONNO) {
    file_error(ms, 0, "File %s supports only version %d magic "
        "files. `%s' is version %d", VERSION,
        VERSIONNO, dbname, version);
    return -1;
  }
  entries = CAST(uint32_t, map->len / sizeof(struct magic));
  if ((entries * sizeof(struct magic)) != map->len) {
    file_error(ms, 0, "Size of `%s' %" SIZE_T_FORMAT "u is not "
        "a multiple of %" SIZE_T_FORMAT "u",
        dbname, map->len, sizeof(struct magic));
    return -1;
  }
  map->magic[0] = CAST(struct magic *, map->p) + 1;
  nentries = 0;
  for (i = 0; i < MAGIC_SETS; i++) {
    if (needsbyteswap)
      map->nmagic[i] = swap4(ptr[i + 2]);
    else
      map->nmagic[i] = ptr[i + 2];
    if (i != MAGIC_SETS - 1)
      map->magic[i + 1] = map->magic[i] + map->nmagic[i];
    nentries += map->nmagic[i];
  }
  if (entries != nentries + 1) {
    file_error(ms, 0, "Inconsistent entries in `%s' %u != %u",
        dbname, entries, nentries + 1);
    return -1;
  }
  if (needsbyteswap)
    for (i = 0; i < MAGIC_SETS; i++)
      byteswap(map->magic[i], map->nmagic[i]);
  return 0;
}

/*
 * handle an mmaped file.
 */
file_private int
apprentice_compile(struct magic_set *ms, struct magic_map *map, const char *fn)
{
  static const size_t nm = sizeof(*map->nmagic) * MAGIC_SETS;
  static const size_t m = sizeof(**map->magic);
  int fd = -1;
  size_t len;
  char *dbname;
  int rv = -1;
  uint32_t i;
  union {
    struct magic m;
    uint32_t h[2 + MAGIC_SETS];
  } hdr;

  dbname = mkdbname(ms, fn, 1);

  if (dbname == NULL)
    goto out;

  if ((fd = open(dbname, O_WRONLY|O_CREAT|O_TRUNC|O_BINARY, 0644)) == -1)
  {
    file_error(ms, errno, "cannot open `%s'", dbname);
    goto out;
  }
  memset(&hdr, 0, sizeof(hdr));
  hdr.h[0] = MAGICNO;
  hdr.h[1] = VERSIONNO;
  memcpy(hdr.h + 2, map->nmagic, nm);

  if (write(fd, &hdr, sizeof(hdr)) != CAST(ssize_t, sizeof(hdr))) {
    file_error(ms, errno, "error writing `%s'", dbname);
    goto out2;
  }

  for (i = 0; i < MAGIC_SETS; i++) {
    len = m * map->nmagic[i];
    if (write(fd, map->magic[i], len) != CAST(ssize_t, len)) {
      file_error(ms, errno, "error writing `%s'", dbname);
      goto out2;
    }
  }

  rv = 0;
out2:
  if (fd != -1)
    (void)close(fd);
out:
  apprentice_unmap(map);
  free(dbname);
  return rv;
}

file_private const char ext[] = ".mgc";
/*
 * make a dbname
 */
file_private char *
mkdbname(struct magic_set *ms, const char *fn, int strip)
{
  const char *p, *q;
  char *buf;

  if (strip) {
    if ((p = strrchr(fn, '/')) != NULL)
      fn = ++p;
  }

  for (q = fn; *q; q++)
    continue;
  /* Look for .mgc */
  for (p = ext + sizeof(ext) - 1; p >= ext && q >= fn; p--, q--)
    if (*p != *q)
      break;

  /* Did not find .mgc, restore q */
  if (p >= ext)
    while (*q)
      q++;

  q++;
  /* Compatibility with old code that looked in .mime */
  if (ms->flags & MAGIC_MIME) {
    if (asprintf(&buf, "%.*s.mime%s", CAST(int, q - fn), fn, ext)
        < 0)
      return NULL;
    if (access(buf, R_OK) != -1) {
      ms->flags &= MAGIC_MIME_TYPE;
      return buf;
    }
    free(buf);
  }
  if (asprintf(&buf, "%.*s%s", CAST(int, q - fn), fn, ext) < 0)
    return NULL;

  /* Compatibility with old code that looked in .mime */
  if (strstr(fn, ".mime") != NULL)
    ms->flags &= MAGIC_MIME_TYPE;
  return buf;
}

/*
 * Byteswap an mmap'ed file if needed
 */
file_private void
byteswap(struct magic *magic, uint32_t nmagic)
{
  uint32_t i;
  for (i = 0; i < nmagic; i++)
    bs1(&magic[i]);
}

#if !defined(HAVE_BYTESWAP_H) && !defined(HAVE_SYS_BSWAP_H)
/*
 * swap a short
 */
file_private uint16_t
swap2(uint16_t sv)
{
  uint16_t rv;
  uint8_t *s = RCAST(uint8_t *, RCAST(void *, &sv));
  uint8_t *d = RCAST(uint8_t *, RCAST(void *, &rv));
  d[0] = s[1];
  d[1] = s[0];
  return rv;
}

/*
 * swap an int
 */
file_private uint32_t
swap4(uint32_t sv)
{
  uint32_t rv;
  uint8_t *s = RCAST(uint8_t *, RCAST(void *, &sv));
  uint8_t *d = RCAST(uint8_t *, RCAST(void *, &rv));
  d[0] = s[3];
  d[1] = s[2];
  d[2] = s[1];
  d[3] = s[0];
  return rv;
}

/*
 * swap a quad
 */
file_private uint64_t
swap8(uint64_t sv)
{
  uint64_t rv;
  uint8_t *s = RCAST(uint8_t *, RCAST(void *, &sv));
  uint8_t *d = RCAST(uint8_t *, RCAST(void *, &rv));
# if 0
  d[0] = s[3];
  d[1] = s[2];
  d[2] = s[1];
  d[3] = s[0];
  d[4] = s[7];
  d[5] = s[6];
  d[6] = s[5];
  d[7] = s[4];
# else
  d[0] = s[7];
  d[1] = s[6];
  d[2] = s[5];
  d[3] = s[4];
  d[4] = s[3];
  d[5] = s[2];
  d[6] = s[1];
  d[7] = s[0];
# endif
  return rv;
}
#endif

file_protected uintmax_t 
file_varint2uintmax_t(const unsigned char *us, int t, size_t *l)
{
        uintmax_t x = 0;
        const unsigned char *c;
        if (t == FILE_LEVARINT) {
                for (c = us; *c; c++) {
                        if ((*c & 0x80) == 0)
                                break;
                }
    if (l)
      *l = c - us + 1;
                for (; c >= us; c--) {
                        x |= *c & 0x7f;
                        x <<= 7;
                }
        } else {
                for (c = us; *c; c++) {
      x |= *c & 0x7f;
      if ((*c & 0x80) == 0)
        break;
      x <<= 7;
                }
    if (l)
      *l = c - us + 1;
        }
  return x;
}


/*
 * byteswap a single magic entry
 */
file_private void
bs1(struct magic *m)
{
  m->cont_level = swap2(m->cont_level);
  m->offset = swap4(CAST(uint32_t, m->offset));
  m->in_offset = swap4(CAST(uint32_t, m->in_offset));
  m->lineno = swap4(CAST(uint32_t, m->lineno));
  if (IS_STRING(m->type)) {
    m->str_range = swap4(m->str_range);
    m->str_flags = swap4(m->str_flags);
  }
  else {
    m->value.q = swap8(m->value.q);
    m->num_mask = swap8(m->num_mask);
  }
}

file_protected size_t
file_pstring_length_size(struct magic_set *ms, const struct magic *m)
{
  switch (m->str_flags & PSTRING_LEN) {
  case PSTRING_1_LE:
    return 1;
  case PSTRING_2_LE:
  case PSTRING_2_BE:
    return 2;
  case PSTRING_4_LE:
  case PSTRING_4_BE:
    return 4;
  default:
    file_error(ms, 0, "corrupt magic file "
        "(bad pascal string length %d)",
        m->str_flags & PSTRING_LEN);
    return FILE_BADSIZE;
  }
}
file_protected size_t
file_pstring_get_length(struct magic_set *ms, const struct magic *m,
    const char *ss)
{
  size_t len = 0;
  const unsigned char *s = RCAST(const unsigned char *, ss);
  unsigned int s3, s2, s1, s0;

  switch (m->str_flags & PSTRING_LEN) {
  case PSTRING_1_LE:
    len = *s;
    break;
  case PSTRING_2_LE:
    s0 = s[0];
    s1 = s[1];
    len = (s1 << 8) | s0;
    break;
  case PSTRING_2_BE:
    s0 = s[0];
    s1 = s[1];
    len = (s0 << 8) | s1;
    break;
  case PSTRING_4_LE:
    s0 = s[0];
    s1 = s[1];
    s2 = s[2];
    s3 = s[3];
    len = (s3 << 24) | (s2 << 16) | (s1 << 8) | s0;
    break;
  case PSTRING_4_BE:
    s0 = s[0];
    s1 = s[1];
    s2 = s[2];
    s3 = s[3];
    len = (s0 << 24) | (s1 << 16) | (s2 << 8) | s3;
    break;
  default:
    file_error(ms, 0, "corrupt magic file "
        "(bad pascal string length %d)",
        m->str_flags & PSTRING_LEN);
    return FILE_BADSIZE;
  }

  if (m->str_flags & PSTRING_LENGTH_INCLUDES_ITSELF) {
    size_t l = file_pstring_length_size(ms, m);
    if (l == FILE_BADSIZE)
      return l;
    len -= l;
  }

  return len;
}

file_protected int
file_magicfind(struct magic_set *ms, const char *name, struct mlist *v)
{
  uint32_t i, j;
  struct mlist *mlist, *ml;

  mlist = ms->mlist[1];

  for (ml = mlist->next; ml != mlist; ml = ml->next) {
    struct magic *ma = ml->magic;
    for (i = 0; i < ml->nmagic; i++) {
      if (ma[i].type != FILE_NAME)
        continue;
      if (strcmp(ma[i].value.s, name) == 0) {
        v->magic = &ma[i];
        v->magic_rxcomp = &(ml->magic_rxcomp[i]);
        for (j = i + 1; j < ml->nmagic; j++)
            if (ma[j].cont_level == 0)
              break;
        v->nmagic = j - i;
        return 0;
      }
    }
  }
  return -1;
}

Coverage Report

Created: 2023-09-25 07:18