Section: File Formats (5)
This manual page documents the format of the magic file as used by the file?(1) command, version 5.22. The file?(1) command identifies the type of a file using, among other tests, a test for whether the file contains certain ``magic patterns'' The file /usr/share/misc/magic specifies what patterns are to be tested for, what message or MIME type to print if a particular pattern is found, and additional information to extract from the file.
Each line of the file specifies a test to be performed. A test compares the data starting at a particular offset in the file with a byte value, a string or a numeric value. If the test succeeds, a message is printed. The line consists of the following fields:
The string is not NUL terminated. ``J is used rather than the more valuable ``I because this type of length is a feature of the JPEG format.
For compatibility with the Single UNIX Standard, the type specifiers dC and d1 are equivalent to byte the type specifiers uC and u1 are equivalent to ubyte the type specifiers dS and d2 are equivalent to short the type specifiers uS and u2 are equivalent to ushort the type specifiers dI dL and d4 are equivalent to long the type specifiers uI uL and u4 are equivalent to ulong the type specifier d8 is equivalent to quad the type specifier u8 is equivalent to uquad and the type specifier s is equivalent to string In addition, the type specifier dQ is equivalent to quad and the type specifier uQ is equivalent to uquad
Each top-level magic pattern (see below for an explanation of levels) is classified as text or binary according to the types used. Types ``regex and ``search are classified as text tests, unless non-printable characters are used in the pattern. All other tests are classified as binary. A top-level pattern is considered to be a test text when all its patterns are text patterns; otherwise, it is considered to be a binary pattern. When matching a file, binary patterns are tried first; if no match is found, and the file looks like text, then its encoding is determined and the text patterns are tried.
The numeric types may optionally be followed by & and a numeric value, to specify that the value is to be AND'ed with the numeric value before any comparisons are done. Prepending a u to the type indicates that ordered comparisons should be unsigned.
Numeric values may be preceded by a character indicating the operation to be performed. It may be = to specify that the value from the file must equal the specified value, < to specify that the value from the file must be less than the specified value, > to specify that the value from the file must be greater than the specified value, & to specify that the value from the file must have set all of the bits that are set in the specified value, to specify that the value from the file must have clear any of the bits that are set in the specified value, or ~ the value specified after is negated before tested. x to specify that any value will match. If the character is omitted, it is assumed to be = Operators & and ~ don't work with floats and doubles. The operator ! specifies that the line matches if the test does not succeed.
Numeric values are specified in C form; e.g. 13 is decimal, 013 is octal, and 0x13 is hexadecimal.
Numeric operations are not performed on date types, instead the numeric value is interpreted as an offset.
For string values, the string from the file must match the specified string. The operators = < and > (but not & can be applied to strings. The length used for matching is that of the string argument in the magic file. This means that a line can match any non-empty string (usually used to then print the string), with >\0 (because all non-empty strings are greater than the empty string).
Dates are treated as numerical values in the respective internal representation.
The special test x always evaluates to true.
An APPLE 4+4 character APPLE creator and type can be specified as:
A MIME type is given on a separate line, which must be the next non-blank or comment line after the magic line that identifies the file type, and has the following format:
i.e. the literal string ``!:mime'' followed by the MIME type.
An optional strength can be supplied on a separate line which refers to the current magic description using the following format:
!:strength OP VALUE</BLOCKQUOTE>
The operand OP can be: + - * or / and VALUE is a constant between 0 and 255. This constant is applied using the specified operand to the currently computed default magic strength.
Some file formats contain additional information which is to be printed along with the file type or need additional tests to determine the true file type. These additional tests are introduced by one or more > characters preceding the offset. The number of > on the line indicates the level of the test; a line with no > at the beginning is considered to be at level 0. Tests are arranged in a tree-like hierarchy: if the test on a line at level n succeeds, all following tests at level n+1 are performed, and the messages printed if the tests succeed, until a line with level n (or less) appears. For more complex files, one can use empty messages to get just the "if/then" effect, in the following way:
0 string MZ >0x18 leshort <0x40 MS-DOS executable >0x18 leshort >0x3f extended PC executable (e.g., MS Windows)</BLOCKQUOTE>
Offsets do not need to be constant, but can also be read from the file being examined. If the first character following the last > is a ( then the string after the parenthesis is interpreted as an indirect offset. That means that the number after the parenthesis is used as an offset in the file. The value at that offset is read, and is used again as an offset in the file. Indirect offsets are of the form: (( x [.[bislBISL]][+-][ y ]) The value of x is used as an offset in the file. A byte, id3 length, short or long is read at that offset depending on the [bislBISLm] type specifier. The capitalized types interpret the number as a big endian value, whereas the small letter versions interpret the number as a little endian value; the m type interprets the number as a middle endian (PDP-11) value. To that number the value of y is added and the result is used as an offset in the file. The default type if one is not specified is long.
That way variable length structures can be examined:
# MS Windows executables are also valid MS-DOS executables 0 string MZ >0x18 leshort <0x40 MZ executable (MS-DOS) # skip the whole block below if it is not an extended executable >0x18 leshort >0x3f >>(0x3c.l) string PE\0\0 PE executable (MS-Windows) >>(0x3c.l) string LX\0\0 LX executable (OS/2)</BLOCKQUOTE>
This strategy of examining has a drawback: You must make sure that you eventually print something, or users may get empty output (like, when there is neither PE\0\0 nor LE\0\0 in the above example)
If this indirect offset cannot be used directly, simple calculations are possible: appending [+-*/%&|^]number inside parentheses allows one to modify the value read from the file before it is used as an offset:
# MS Windows executables are also valid MS-DOS executables 0 string MZ # sometimes, the value at 0x18 is less that 0x40 but there's still an # extended executable, simply appended to the file >0x18 leshort <0x40 >>(4.s*512) leshort 0x014c COFF executable (MS-DOS, DJGPP) >>(4.s*512) leshort !0x014c MZ executable (MS-DOS)</BLOCKQUOTE>
Sometimes you do not know the exact offset as this depends on the length or position (when indirection was used before) of preceding fields. You can specify an offset relative to the end of the last up-level field using `&' as a prefix to the offset:
0 string MZ >0x18 leshort >0x3f >>(0x3c.l) string PE\0\0 PE executable (MS-Windows) # immediately following the PE signature is the CPU type >>>&0 leshort 0x14c for Intel 80386 >>>&0 leshort 0x184 for DEC Alpha</BLOCKQUOTE>
Indirect and relative offsets can be combined:
0 string MZ >0x18 leshort <0x40 >>(4.s*512) leshort !0x014c MZ executable (MS-DOS) # if it's not COFF, go back 512 bytes and add the offset taken # from byte 2/3, which is yet another way of finding the start # of the extended executable >>>&(2.s-514) string LE LE executable (MS Windows VxD driver)</BLOCKQUOTE>
Or the other way around:
0 string MZ >0x18 leshort >0x3f >>(0x3c.l) string LE\0\0 LE executable (MS-Windows) # at offset 0x80 (-4, since relative offsets start at the end # of the up-level match) inside the LE header, we find the absolute # offset to the code area, where we look for a specific signature >>>(&0x7c.l+0x26) string UPX \b, UPX compressed</BLOCKQUOTE>
Or even both!
0 string MZ >0x18 leshort >0x3f >>(0x3c.l) string LE\0\0 LE executable (MS-Windows) # at offset 0x58 inside the LE header, we find the relative offset # to a data area where we look for a specific signature >>>&(&0x54.l-3) string UNACE \b, ACE self-extracting archive</BLOCKQUOTE>
If you have to deal with offset/length pairs in your file, even the second value in a parenthesized expression can be taken from the file itself, using another set of parentheses. Note that this additional indirect offset is always relative to the start of the main indirect offset.
0 string MZ >0x18 leshort >0x3f >>(0x3c.l) string PE\0\0 PE executable (MS-Windows) # search for the PE section called ".idata"... >>>&0xf4 search/0x140 .idata # ...and go to the end of it, calculated from start+length; # these are located 14 and 10 bytes after the section name >>>>(&0xe.l+(-4)) string PK\3\4 \b, ZIP self-extracting archive</BLOCKQUOTE>
If you have a list of known avalues at a particular continuation level, and you want to provide a switch-like default case:
# clear that continuation level match >18 clear >18 lelong 1 one >18 lelong 2 two >18 default x # print default match >>18 lelong x unmatched 0x%x</BLOCKQUOTE>
The formats long belong lelong melong short beshort and leshort do not depend on the length of the C data types short and long on the platform, even though the Single UNIX Specification implies that they do. However, as OS X Mountain Lion has passed the Single UNIX Specification validation suite, and supplies a version of file?(1) in which they do not depend on the sizes of the C data types and that is built for a 64-bit environment in which long is 8 bytes rather than 4 bytes, presumably the validation suite does not test whether, for example long refers to an item with the same size as the C data type long There should probably be type names int8 uint8 int16 uint16 int32 uint32 int64 and uint64 and specified-byte-order variants of them, to make it clearer that those types have specified widths.
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