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58a0f0d00c
Merge the latest file(1) in.
Relevent Changelog:
- extend the support for ${x?:} expansions for magic descriptions
- add support for ${x?:} in mime types to handle pie binaries.
- add support for negative offsets (offsets from the end of file)
- close the file on error when writing magic
Relnotes: yes
50 lines
2.0 KiB
Plaintext
50 lines
2.0 KiB
Plaintext
Most TODOs live in the TODO section of doc/file.man (i.e. file(1)).
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They are more visible there, so please add any further TODOs to that
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file, not here. More speculative material can live here.
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(This change was made when Reuben Thomas noticed that all the bugs
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listed in the BUGS section of the man page had been fixed!)
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---
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It would be nice to simplify file considerably. For example,
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reimplement the apprentice and non-pattern magic methods in Python,
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and compile the magic patterns to a giant regex (or something similar;
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maybe using Ragel (http://www.complang.org/ragel/)) so that only a
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small amount of C is needed (because fast execution is typically only
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required for soft magic, not the more detailed information given by
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hard-wired routines). In this regard, note that hplip, which is
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BSD-licensed, has a magic reimplementation in Python.
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---
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Read the kerberos magic entry for more ideas.
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---
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Write a string merger to make magic entry sizes dynamic.
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Strings will be converted to offsets from the string table.
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---
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Programming language support, we can introduce the concept of a group
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of rules where n rules need to match before the rule is positive. This
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could require structural changes to the matching code :-(
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0 group 2 # require 2 matches
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# rule 1
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>0 ....
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...
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# rule 2
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>0 ....
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...
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---
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- Merge the stat code dance in one place and keep it in one place
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(perhaps struct buffer).
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- Enable seeking around if offset > nbytes if possible (the fd
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is seekable).
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- We could use file_pipe2file more (for EOF offsets, CDF documents),
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but that is expensive; perhaps we should provide a way to disable it
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- The implementation of struct buffer needs re-thinking and more work.
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For example we don't always pass the fd in the child. This is not
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important yet as we don't have yet cases where use/indirect magic
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needs negative offsets.
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- Really the whole thing just needs here's an (offset, buffer, size)
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you have (filebuffer, filebuffersize &&|| fd), fill the buffer with
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data from offset. The buffer API should be changed to just do that.
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christos
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