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2020-02-15Don't set error status on block processor for non-fatal errorsDavid Oberhollenzer
If the API is mis-used or allocation fails, return an appropriate error code, but don't permanently break the block processor. It's easy to recover from that. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-15Add a "sequence error" to libsquashfs error codesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-15Cleanup: block processor: remove delayed thread notificationDavid Oberhollenzer
Under the assumption that block processing is CPU bound and not I/O bound, this is entirely useless. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-12Use a hash table for fragment lookup instead of linear searchDavid Oberhollenzer
Profiling on a sample filesystem determined that fragment deduplication lookups rank third place directly after crc32 and the actual compression. By using a hash table instead of linear search, this time can be reduced drastically. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-12Update CHANGELOG.mdDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-12Implement a more explicit object systemDavid Oberhollenzer
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>
2020-02-12Cleanup: Move sqfs_block_t to block processor internalsDavid Oberhollenzer
It was basically built around the block processor and exposed way too many internals. Removing it from other places was mostly trivial. This commit completely removes it from the public API and even most of the libsquashfs internals. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-12Remove usage of sqfs_block_t from block readerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-12Clenaup: remove useage of sqfs_block_t from block writerDavid Oberhollenzer
The sqfs_block_t structure has been written for the block processor and exposes way too many internals. This commit removes its usage from the block writer, cutting it down to the bare essentials, so the structure can be removed from the public API later on. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-12Fix data reader return codesDavid Oberhollenzer
Return an error number as document instead of throwing -1. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-12Fix iteration over directory children in sqfsdiffDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-11Document the block writer API.David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-10Cleanup: remove block hooks entirely from block processorDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-10Cleanup: remove the fragment store/discard and block discard hooksDavid Oberhollenzer
There is no obvious non-footgun use for those other than tallying statistics, which is now done by the data structures themselves. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-10Cleanup statistics print outDavid Oberhollenzer
- Give a rounded input/output byte count. - Seperate groups by new lines. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-10Cleanup: Use stat structs instead of hooks in tar2sqfs/gensquashfsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-10Add run time statistics to the block writer and processorDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-09block processor: merge left overs of block.c/fragment.c into common.cDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-09Move block writer and fragment table management out of block processorDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-31Split the block writing/deduplication away from the block processorDavid Oberhollenzer
This commit moves the entire block writing and deduplication of data blocks over to a different data type named "block writer". For simplicity, the interfaces of the block processor are left as is and are turned into warppers. Likewise, most of the code in the block writer is just verbatim from the block processor, to be cleaned up in subsequent commits. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-29Rename sqfs_data_writer_t back to sqfs_block_processor_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-29Update sha512sums for corpora testsDavid Oberhollenzer
The fragment table data structure has different policies for setting super block flags which affects the resulting sha512 checksums. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-26Fix memory leak in hard link detection codeDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-26Cleanup: Move fragment deduplication code over to fragment tableDavid Oberhollenzer
This removes further clutter from the data writer. Any future efforts on making fragment by hash lookup faster can focus on that area only and don't clutter the block processor. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-25Add missing headers to installed header listDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-24Cleanup: use fragment table primitive in data writerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-24Cleanup: remove single use helper functions from data writerDavid Oberhollenzer
This commit moves the single use helper functions that are called from worker thread context into the worker thread function. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-24Cleanup: use the frag table data type in the data readerDavid Oberhollenzer
Instead of doing everything by manually. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-24Add a fragment table primitive to libsquashfsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-20Add a flag field to the id table create functionDavid Oberhollenzer
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>
2020-01-20Replace hand curated repo list with external badge linkDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-20An attempt at cleaning sqfsbrowse a little and adding explanationsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-20Add a "cat" command to sqfsbrowse that uses the data readerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-19Cleanup: remove the payload pointers from sqfs_inode_generic_tDavid Oberhollenzer
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>
2020-01-19Minor documentation updateDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-19Update explanation on directory index accountingDavid Oberhollenzer
Tests with the Debian image (which is generated with squashfs-tools, so should be interpreted as ground truth) have showed that the count is not stored off-by-one. The code was already doing the right thing, but the documentation was wrong. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-19Add a helper function to unpack directory index entriesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-19Fix directory index accounting when reading inodesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-13Add readline based sqfsbrowse demoDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-12Add a simple directory listing demoDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-12Implement 42.sqfs demoDavid Oberhollenzer
A play on the famous 42.zip Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-12Port mknastyfs to libsquashfsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-12Add stub for sample programsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-12Add a start anchor parameter to sqfs_dir_reader_find_by_pathDavid Oberhollenzer
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>
2020-01-12Add an inode deep copy helper function to libsquashfsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-11Some clarifications and fixes for the format specificationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-11Update README.md, CHANGELOG.mdDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-08Always append '/' to names of directoriesDavid Oberhollenzer
In the distant past, the first versions of tar did not have any header field to indicate the type of the file being packed. Instead, they used to append a '/' to the filename to indicate that an entry is a actually a directory. GNU tar still does this today, despite having a header field for file type. This commit modifies sqfs2tar to append slashes to directory names for compatibillity and to mimic GNU tar behaviour more closely. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-06Cleanup: use parse_size function to parse compressor optionsDavid Oberhollenzer
The XZ option parser had a similar function to parse_size. This commit removes the other implementation and extends parse_size with the one missing feature, i.e. allowing a '%' suffix for a relative value. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-05Update README.md, CHANGELOG.mdDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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