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Implement grab/drop functions to increase/decrease reference count
and destroy the object if the count drops to 0.
Make sure that all objects that maintain internal references actually
grab that reference, duplicate it in the copy function, drop it in
the destroy handler.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Two flags are added to the dir reader API, one for the create function
that the dir reader should report those entries and one to the open
function to suppress that if it was enabled.
To implement the feature, a mapping of visited directory inodes is
maintained internally, that mapps inode numbers to inode references.
When opening a directory, state is maintained to generate the fake
entries for '.' and '..'. Since all the other functions are based on
the open/read/rewind API, no alterations need to be made. The tree
scan function is modified, to use the suppress flag, so it does not
accidentally catch those entries.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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On systems like Windows, the dynamic library and applications can
easily end up being linked against different runtime libraries, so
applications cannot be expected to be able to free() any malloc'd
pointer that the library returns.
This commit adds an sqfs_free function so the application can pass
pointers back to the library to call the correct free() implementation.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Missed in commit 259a98985b4f (Add flags to functions that might
logically be expanded in the future)
Signed-off-by: Matt Turner <mattst88@gmail.com>
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None of the currently implemented compressors do anything with that data.
They are all at the mercy of the data actually in the image.
This commit removes the code from sqfs2tar and rdsquashfs that decodes
the options, which also has the side effect of increasing compatibillity
with some non-confirming images.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Make sure the function has a way of telling the caller *why* it failed.
This way, the function can convey whether it had an internal error, an
allocation failure, whether the arguments are totaly nonsensical, or
simply that the compressor *or specific configuration* is not supported.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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- Make sure to release the inode returne by the dir reader
- Check the path resolution return code in change_directory
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Instead of having seperate counters for blocks, dir index bytes
and having to fiddle out the link target size, simply use a single
value that stores the number of payload bytes used.
A seperate "payload bytes available" is used for dynamically
growing inodes during processing.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Make every dynamically allocated, opaque data structure inherit from
a common sqfs_object_t structure with common entry points (e.g. destroy).
This removes tons of public API functions and replaces them with a
simple sqfs_destroy instead. If semantics of the (until now implicit)
object system need to be extended, it can be much more conveniantely
done this way.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Just to be safe in case there needs to be an extension
in the future.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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There are 3 types of extra payload:
- Directory index
- File block sizes
- Symlink target
This commit removes the type specific pointers and modifies the code
to use the payload area directly. To simplify the file block case and
mitigate alignment issues, the type of the extra field is changed to
sqfs_u32.
For symlink target, the extra field can simply be cast to a character
pointer (it had to be cast anyway for most uses). For block sizes,
probably the most common usecase, it can be used as is. For directory
indices, there is a helper function anyway.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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