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Top Forums Programming searching files for hex or oct values Post 302441100 by daflore on Thursday 29th of July 2010 09:39:48 AM
Old 07-29-2010
searching files for hex or oct values

I have a set of files without extensions. How can I programatically tell if a file is in gzip format? The gzip file format spec

RFC 1952 GZIP File Format Specification version 4.3

states that gzip files have certain hex/oct values at the beginning of the file.

1st byte = 0x1f in hex, \037 in octal
2nd byte = 0x8b in hex, \213 in octal

How can I search for these values to determine if a file is truly gzip format?

Thanks.
 

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GZFORCE(1)						      General Commands Manual							GZFORCE(1)

NAME
gzforce - force a '.gz' extension on all gzip files SYNOPSIS
gzforce [ name ... ] DESCRIPTION
gzforce forces a .gz extension on all gzip files so that gzip will not compress them twice. This can be useful for files with names trun- cated after a file transfer. On systems with a 14 char limitation on file names, the original name is truncated to make room for the .gz suffix. For example, 12345678901234 is renamed to 12345678901.gz. A file name such as foo.tgz is left intact. SEE ALSO
gzip(1), gznew(1), gzmore(1), gzgrep(1), gzdiff(1), gzexe(1) ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgzip | +--------------------+-----------------+ |Interface Stability | External | +--------------------+-----------------+ NOTES
Source for gzip is available in the SUNWgzipS package. GZFORCE(1)
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