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By storing the blocks in a tree, the de-duplication can lookup
existing blocks in logartihmic instead of linear time.
The linked list is still maintained, because we need to iterate
over the blocks in creation order during serialization.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Instead of dereferencing the NULL pointer and crashing.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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If an xattr value is stored OOL, the value actually holds an 8 byte
reference to another, previously stored value. This reference points
to the header that we need to read to know the actual size of the
value before reading it, not the value itself, so after reading the
reference and seeking to it, the xattr reader needs to read the actual
header.
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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It does not make any changes to the writer itself, so mark it as
const. This also requires some similar changes to the string table.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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After finding a match, reducing the reference count of the matched
elements and increasing them afterwards leaves the reference count
identical, because they refere to the same entries.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This commit moves the libsquashfs xattr related code into a sub
directory and splits the xattr writer code up into several files.
No actual code is changed.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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