security-and-privacy/pdfparanoia
security-and-privacy/pdfparanoia
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fixing README

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Scott Morrison 2013-05-02 23:27:49 +10:00
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@ -1,15 +1,17 @@
`comparediffs` provides a tools for downloading a PDF from two different sources, running pdfparanoia on the files, comparing the outputs byte-for-byte,
and reporting the results.
`comparediffs` provides a tool which
* downloads a PDF from two different sources,
* runs `pdfparanoia` on both files, and
* compares the outputs byte-for-byte.
Typical usage is to first establish two `ssh` tunnels to hosts with access to the literature, e.g. via
`ssh -D 1080 host1` and `ssh -D 1081 host2`. You can then invoke `comparediffs` via
./comparediffs localhost:1080 localhost:1081 < urls
where urls is a file containing one URL per line (e.g. the example file in this directory).
where `urls` is a file containing one URL per line (e.g. the example file in this directory).
`comparediffs` creates a subdirectory `pdf/`, in which is stores PDFs. It won't try to download the same PDF twice, so if you fix pdfparanoia you'll
need to clean out some or all of this subdirectory.
`comparediffs` creates a subdirectory `pdf/`, in which is stores PDFs. It won't try to download the same PDF twice, so if you make changes to `pdfparanoia` you'll
want to clean out some or all of this subdirectory.
It's easy to see which PDFs pdfparanoia failed on, as it leaves copies of the scrubbed files with suffixes `.1.cleaned.pdf` and `.2.cleaned.pdf`.
When pdfparanoia succeeds (or isn't even needed, because the downloaded files were identical), the scrubbed files are removed.
It's easy to see which PDFs `pdfparanoia` failed on afterwards, as it leaves copies of the scrubbed files with suffixes `.1.cleaned.pdf` and `.2.cleaned.pdf`.
When `pdfparanoia` succeeds (or isn't even needed, because the downloaded files were identical), the scrubbed files are removed.