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[REBOL] Re: skip on direct mode file port

From: gscottjones:mchsi at: 12-Aug-2002 7:49

Hi, Anton, From: "Anton"
> I want to read the last 128 bytes of > mpeg audio files. > I have fixed up and am fixing up mp3tool.r > from the script library, which reads id3v1 tags. > Currently, it is reading the whole > file into memory, which is wasteful. > > Is there a way to get the file pointer > to the end without reading the whole file? > > I have a half-solution: > Do a buffered read, with the buffer > set to 128 bytes, such that the last > buffer contents falls over the last > 128 bytes. Or could use a larger buffer > until the last 128 bytes. > Mmm. I don't like it. It's just for fun, > so I can wait, too.
This is not the most efficient method, but it does allow skipping within an unbuffered access: my-blk: copy [] fs: size? %license.html fr: open/direct/binary %license.html loop (fs - 178) [copy/part fr 1] loop 178 [append my-blk copy/part fr 1] close fr Hope this helps until skip is repaired for direct/binary. --Scott Jones