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Full Discussion: Insert string in binary file at top
Top Forums UNIX for Advanced & Expert Users Insert string in binary file at top Post 302526307 by kumaran_5555 on Tuesday 31st of May 2011 06:15:00 AM
Old 05-31-2011
Code:
How can i append a EBCDIC string of 100 bytes to 0th position of a binary file in UNIX.

If you are attempting to insert 100 bytes at the end , then it isn't appedning at all. As far as I know, it the File system has to rearrange the blocks to accomadate the new 100 bytes.

So if you are inserting 100 bytes at the head of 60GB file, ideally i think the performance would be appending 60GB data onto a 100bytes file. I guess so.
 

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LEARN ABOUT PHP

xdiff_string_rabdiff

XDIFF_STRING_RABDIFF(3) 						 1						   XDIFF_STRING_RABDIFF(3)

xdiff_string_rabdiff - Make binary diff of two strings using the Rabin's polynomial fingerprinting algorithm

SYNOPSIS

       string xdiff_string_bdiff (string  $old_data, string  $new_data)

DESCRIPTION

	Makes  a  binary  diff	of two strings and returns the result. The difference between this function and xdiff_string_bdiff(3) is different
       algorithm used which should result in faster execution and smaller diff produced. This function works  with  both  text	and  binary  data.
       Resulting patch can be later applied using xdiff_string_bpatch(3)/xdiff_file_bpatch(3).

	For more details about differences between algorithm used please check libxdiff website.

PARAMETERS

	      o $old_data
		- First string with binary data. It acts as "old" data.

	      o $new_data
		- Second string with binary data. It acts as "new" data.

RETURN VALUES

	Returns string with binary diff containing differences between "old" and "new" data or FALSE if an internal error occurred.

SEE ALSO

       xdiff_string_bpatch(3).

PHP Documentation Group 												   XDIFF_STRING_RABDIFF(3)
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