Hello , how could i insert some content into a large file?

hello , how could i insert some content in a large file? ----just like a txt editor do.
assume that i have a 6G file(i think it large enough), then i wann insert one ascii character at the begining of the file,does that means:
1> i need create one 6G+1byte new file, then copy all content of the original file following by that addition character?
2> not creat new file,just set original file length to 6G+1byte,then offset all 6G byte by one byte,after all adding my one character?(it seems not some kind of optimization ...)
what should i do?
Edited by: littleJohnny on Jan 16, 2008 2:03 AM

could some means can set the read hint of 6Gbyte content after my character first read out? ----just let my addition point to the begining of 6G original content ,then the addition character take the place of the file header? ----the inster may be the same....
i just think the already used txt editor seem so fast to process insert, replace .... 2M 10M maybe.... does they doing those operation use Java Type ---String? ------read all contet into memory,then it is easy to regular expression ,relinking read order....-----does it mean large file couldn't against with pattern?
does all ctrl+s shortcut-----rewrite original file with memory relinked order? then large file could not easily manipulate its structure but all structured file is large than plain format...
just teach me some "already used txt editor " trick,thanks very much.

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