From: Tulsi Das <tulsidas@...>
Date: 2006-11-27T23:48:33+09:00
Subject: Appending to file in arbitrary position

Hi, I'm implementing the server side of a file upload with resume option
part of a web app.

The client sends the last position so I have to append to the existing
file from that position.

Current code is:

@uploadfile = @params["uploadfile"]
content_range = @request.env['HTTP_CONTENT_RANGE']
filename = @uploadfile.original_filename
data = @uploadfile.read

# position to append from
pos = content_range[/\d+/].to_i

f = File.open("#{filename}", "a")
#f.pos = pos
f.seek(pos)
f.write(data)
f.close

I've tried opening the file with a and a+ modes. I've tried doing
rewing, setting pos (like the commented line) and seek, and none of them
works, the new data is always appended at the end of the file.

Any clues?

Thanks

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