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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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There is no need to keep a copy of the state data internally. If the
external user wants to reset/rewind, they can simply keep a copy of
the old state, now that it is completely transparent.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Instead of holding the state internally, move it outside and let the
user pass it in. This allows processing multiple directories and going
back and forth between them, while also simplifying the dir reader
internals.
The sqfs_dir_reader_get_inode function can also be made more generic
to accept a reference instead of being fully state dependent.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Those functions are only used in the example code, we remove them for
now to make restructuring easier and fix the examples later.
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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The only user in the code base is sqfs_dir_reader_find_by_path.
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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Exact operation performed:
git ls-files -z | \
xargs -0 sed -i -e 's/sqfs_dir_entry_t/sqfs_dir_node_t/g'
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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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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Test against various invariants:
- Every non-root node must have a name
- The root node muts not have a name
- The name must not be ".." or "."
- The name must not contain '/'
- The loop that chases parent pointers must terminate, i.e. we must
never reach the starting state again (link loop).
Furthermore, make sure the sum of all path components plus separators
does not overflow.
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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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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Many library destructor functions (like free()) allow a NULL
pointer as input, and do nothing in that case.
This allows easier cleanup patterns: initialize pointers to NULL
and then always pass them to the destroyer functions, no need for
verbose goto/if-else patterns.
Signed-off-by: Luca Boccassi <luca.boccassi@microsoft.com>
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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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Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Avoid namespace polution. Make sure all exportet symbols are prefixed
with either sqfs_ or SQFS_.
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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It optionally allows code that does tree traversal to start at an
inode that it obtained previously and makes it easier to keep state
externally.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Signed-off-by: Benjamin Drung <benjamin.drung@cloud.ionos.com>
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Instead of using int or unsigned int for generic function flag
arguments, consistently use an unsigned, fixed size type.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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- Padd the compressor config union
- 128 bytes aught to be enough for everyone, i.e. future compressors.
- Insist that the padding space is initialized to 0. If a field gets
added to an existing compressor, it can test for 0 as a sentinel
value.
- Add a size field to the hook structure, aka "the Microsoft way".
- The explanation is in the comment.
- Don't make the Microsoft mistake of checking for >=, insist on *exact*
size match. Future users will need a fallback if their hooks are
rejected. But at least they will be rejected instead of silently not
being used.
- Add an unsupported flag check to the dir tree reader.
- Add a basic abi unit test that, for now, checks the size of the compressor
config struct fields.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is a fully automated search and replace, i.e. I ran this:
git grep -l uint8_t | xargs sed -i 's/uint8_t/sqfs_u8/g'
git grep -l uint16_t | xargs sed -i 's/uint16_t/sqfs_u16/g'
git grep -l uint32_t | xargs sed -i 's/uint32_t/sqfs_u32/g'
git grep -l uint64_t | xargs sed -i 's/uint64_t/sqfs_u64/g'
git grep -l int8_t | xargs sed -i 's/int8_t/sqfs_s8/g'
git grep -l int16_t | xargs sed -i 's/int16_t/sqfs_s16/g'
git grep -l int32_t | xargs sed -i 's/int32_t/sqfs_s32/g'
git grep -l int64_t | xargs sed -i 's/int64_t/sqfs_s64/g'
and than added the appropriate definitions to sqfs/predef.h
The whole point being better compatibillity with platforms that may
not have an stdint.h with the propper definitions.
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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