How to replicate Ruby�s binary file reading with Java? Post: 302926116

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Top Forums Programming How to replicate Ruby�s binary file reading with Java? Post 302926116 by achenle on Friday 21st of November 2014 09:24:02 AM

11-21-2014

Registered User

Quote:

Originally Posted by bakunin

I am no expert in Java, but i don't think this is possible. You probably have to do it yourself, like in good old C. You open a file (fopen()) and use fseek(), fread() and ftell() to find what you search for. The functions are part of the standard library, so they should work the same way in C and Java.

I hope this helps.

bakunin

AFAIK there's no way to use the stdio-based family of library calls (fopen(), etc.) and have them treat the binary sequence "FF47" as a "line" separator.

Even if you could set your LOCALE envvals to use a character set that uses "FF47" as a 16-bit character newline character (if one even exists), the fact that it's a binary file could break things - the "newline" character might not always be in a 16-bit boundary.

The only way to do what the OP asked is to read the file as a binary file, and search for the "FF47" bits. And hope that the way the file was written wasn't in a way that's endian-dependent. Especially when using Java on a little-endian machine (x86, most ARM OS's) as Java tends to read/write data in network byte order - big endian - for portability.

achenle

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LEARN ABOUT HPUX

_encodebinary128

_encodebinary64(3M)													       _encodebinary64(3M)

NAME

       _encodebinary64(), _encodebinary128(), _encodebinary32() - encode binary-encoded decimal data

SYNOPSIS

DESCRIPTION

       There  are  two	standard  bit-encodings  for decimal floating-point data: binary and decimal.  Both encoding provide exactly the same data
       (analogous to big endian and little endian encodings).  The HP-UX decimal floating-point types use the binary encoding.

       The function encodes x as a binary-encoded 64-bit decimal datum.

       is a version of it takes a argument and returns a result.

       is a version of it takes a argument and returns a result.

       These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward.

USAGE

       To use any of these functions, compile with the option.

       Make sure your program defines and then includes

       Link in the math library by specifying or on the linking command line.

       For more information, see the at the following site:

RETURN VALUE

       returns x in the binary encoding.

       raises no exceptions.

ERRORS

       No errors are defined.

SEE ALSO

       _decodebinary64(3M), _decodedecimal64(3M), _encodedecimal64(3M), math(5).

STANDARDS CONFORMANCE

       These functions are not specified in any standard.

							     HP Integrity Server Only					       _encodebinary64(3M)