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/*
* file.h - definitions for file(1) program
* @(#)Id: file.h,v 1.43 2002/07/03 18:57:52 christos Exp
*
* Copyright (c) Ian F. Darwin, 1987.
* Written by Ian F. Darwin.
*
* This software is not subject to any license of the American Telephone
* and Telegraph Company or of the Regents of the University of California.
*
* Permission is granted to anyone to use this software for any purpose on
* any computer system, and to alter it and redistribute it freely, subject
* to the following restrictions:
*
* 1. The author is not responsible for the consequences of use of this
* software, no matter how awful, even if they arise from flaws in it.
*
* 2. The origin of this software must not be misrepresented, either by
* explicit claim or by omission. Since few users ever read sources,
* credits must appear in the documentation.
*
* 3. Altered versions must be plainly marked as such, and must not be
* misrepresented as being the original software. Since few users
* ever read sources, credits must appear in the documentation.
*
* 4. This notice may not be removed or altered.
*/
#ifndef __file_h__
#define __file_h__
#ifndef HOWMANY
# define HOWMANY 65536 /* how much of the file to look at */
#endif
#define MAXMAGIS 4096 /* max entries in /etc/magic */
#define MAXDESC 50 /* max leng of text description */
#define MAXstring 32 /* max leng of "string" types */
#define MAGICNO 0xF11E041C
#define VERSIONNO 1
#define CHECK 1
#define COMPILE 2
struct magic {
uint16_t cont_level; /* level of ">" */
uint8_t nospflag; /* supress space character */
uint8_t flag;
#define INDIR 1 /* if '>(...)' appears, */
#define UNSIGNED 2 /* comparison is unsigned */
#define OFFADD 4 /* if '>&' appears, */
uint8_t reln; /* relation (0=eq, '>'=gt, etc) */
uint8_t vallen; /* length of string value, if any */
uint8_t type; /* int, short, long or string. */
uint8_t in_type; /* type of indirrection */
#define BYTE 1
#define SHORT 2
#define LONG 4
#define STRING 5
#define DATE 6
#define BESHORT 7
#define BELONG 8
#define BEDATE 9
#define LESHORT 10
#define LELONG 11
#define LEDATE 12
#define PSTRING 13
#define LDATE 14
#define BELDATE 15
#define LELDATE 16
#define REGEX 17
uint8_t in_op; /* operator for indirection */
uint8_t mask_op; /* operator for mask */
#define OPAND 1
#define OPOR 2
#define OPXOR 3
#define OPADD 4
#define OPMINUS 5
#define OPMULTIPLY 6
#define OPDIVIDE 7
#define OPMODULO 8
#define OPINVERSE 0x80
int32_t offset; /* offset to magic number */
int32_t in_offset; /* offset from indirection */
union VALUETYPE {
uint8_t b;
uint16_t h;
uint32_t l;
char s[MAXstring];
const char * buf;
uint8_t hs[2]; /* 2 bytes of a fixed-endian "short" */
uint8_t hl[4]; /* 4 bytes of a fixed-endian "long" */
} value; /* either number or string */
uint32_t mask; /* mask before comparison with value */
char desc[MAXDESC]; /* description */
} __attribute__((__packed__));
#define BIT(A) (1 << (A))
#define STRING_IGNORE_LOWERCASE BIT(0)
#define STRING_COMPACT_BLANK BIT(1)
#define STRING_COMPACT_OPTIONAL_BLANK BIT(2)
#define CHAR_IGNORE_LOWERCASE 'c'
#define CHAR_COMPACT_BLANK 'B'
#define CHAR_COMPACT_OPTIONAL_BLANK 'b'
/* list of magic entries */
struct mlist {
struct magic *magic; /* array of magic entries */
uint32_t nmagic; /* number of entries in array */
/*@relnull@*/
struct mlist *next;
/*@relnull@*/
struct mlist *prev;
};
enum fmagicFlags_e {
/*@-enummemuse@*/
FMAGIC_FLAGS_NONE = 0,
/*@=enummemuse@*/
FMAGIC_FLAGS_DEBUG = (1 << 0),
FMAGIC_FLAGS_BRIEF = (1 << 1), /*!< brief output format */
FMAGIC_FLAGS_MIME = (1 << 2), /*!< output as mime-types */
FMAGIC_FLAGS_CONTINUE = (1 << 3), /*!< continue after 1st match */
FMAGIC_FLAGS_FOLLOW = (1 << 4), /*!< follow symlinks? */
FMAGIC_FLAGS_SPECIAL = (1 << 5), /*!< analyze block devices? */
FMAGIC_FLAGS_UNCOMPRESS = (1 << 6) /*!< uncompress files? */
};
struct fmagic_s {
int flags; /*!< bit(s) to control fmagic behavior. */
/*@dependent@*/ /*@observer@*/ /*@relnull@*/
const char *magicfile; /*!< name of the magic file */
int lineno; /*!< current line number in magic file */
/*@relnull@*/
struct mlist * mlist; /*!< list of arrays of magic entries */
/*@relnull@*/
struct mlist * ml; /*!< current magic array item */
/*@observer@*/
const char * fn; /*!< current file name */
int fd; /*!< current file descriptor */
struct stat sb; /*!< current file stat(2) buffer */
/*@relnull@*/
unsigned char * buf; /*!< current file buffer */
int nb; /*!< current no. bytes in file buffer */
union VALUETYPE val; /*!< current magic expression value */
int cls; /*!< Elf class */
int swap; /*!< Elf swap bytes? */
/*@dependent@*/
char * obp; /*!< current output buffer pointer */
size_t nob; /*!< bytes remaining in output buffer */
char obuf[512]; /*!< output buffer */
};
typedef /*@abstract@*/ struct fmagic_s * fmagic;
/*unchecked@*/
extern fmagic global_fmagic;
/*@unchecked@*//*@observer@*/
extern const char * default_magicfile;
#ifdef __cplusplus
extern "C" {
#endif
/*@mayexit@*/
extern int fmagicSetup(fmagic fm, const char *fn, int action)
/*@globals fileSystem, internalState @*/
/*@modifies fm, fileSystem, internalState @*/;
extern int fmagicProcess(fmagic fm, const char *fn, int wid)
/*@globals fileSystem, internalState @*/
/*@modifies fm, fileSystem, internalState @*/;
extern int fmagicA(fmagic fm)
/*@modifies fm @*/;
extern int fmagicD(fmagic fm)
/*@globals fileSystem, internalState @*/
/*@modifies fm, fileSystem, internalState @*/;
extern void fmagicE(fmagic fm)
/*@globals fileSystem, internalState @*/
/*@modifies fm, fileSystem, internalState @*/;
extern int fmagicF(fmagic fm, int zfl)
/*@globals fileSystem, internalState @*/
/*@modifies fm, fileSystem, internalState @*/;
extern int fmagicS(fmagic fm)
/*@globals fileSystem @*/
/*@modifies fm, fileSystem @*/;
extern int fmagicZ(fmagic fm)
/*@globals fileSystem, internalState @*/
/*@modifies fm, fileSystem, internalState @*/;
extern void fmagicPrintf(const fmagic fm, const char *f, ...)
/*@modifies fm @*/;
/*@observer@*/
extern char *fmttime(long v, int local)
/*@*/;
extern void magwarn(const char *f, ...)
/*@globals fileSystem @*/
/*@modifies fileSystem @*/;
extern void mdump(struct magic *m)
/*@globals fileSystem @*/
/*@modifies fileSystem @*/;
extern void showstr(FILE *fp, const char *s, int len)
/*@globals fileSystem @*/
/*@modifies fp, fileSystem @*/;
extern uint32_t signextend(struct magic *m, uint32_t v)
/*@globals fileSystem @*/
/*@modifies fileSystem @*/;
extern int pipe2file(int fd, void *startbuf, size_t nbytes)
/*@globals errno, fileSystem, internalState @*/
/*@modifies errno, fileSystem, internalState @*/;
#ifdef __cplusplus
}
#endif
#endif /* __file_h__ */
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