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2022-06-01Fix: libsqfs: do not report out of bounds positions from meta readerDavid Oberhollenzer
When asking the meta data reader for its current position and we *just* read to the end of a block, report the start of the next block as the current location. Otherwise, trying to *seek* to the resulting position immediately after reporting throws an out-of-bounds error. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2022-04-10Remove builtin copy of zlibDavid Oberhollenzer
On GNU/Linux, *BSD or MacOS we can simply use the system default library. The copy was primarily only there for the Windows build. The build script for Windows has now been adapted to download and compile a shared library from a tarball. This removes a huge chunk of code from the git tree as well as the release tarballs. Additionally it gets rid of iffy things like removing the Zlib copyright/version strings, so the libsquashfs DLL doesn't export it. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2022-04-09Add support for '.' and '..' entries in sqfs_dir_reader_tDavid Oberhollenzer
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>
2022-04-05libsqfs: move dir reader code to sub directory, add internal headerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2022-03-30sqfs_dir_tree_destroy/sqfs_destroy: allow NULL inputLuca Boccassi
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>
2022-03-10Fix: guard against potential overflow in file size calculationDavid Oberhollenzer
The block_count is a size_t, so on 32 bit platforms the multiplication might be truncated before the comparison with filesz. On 64 bit platforms, it could potentially also overflow the 64 bit bounds of the data type. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-12-05Fix: consistently use the widechar file API on WindowsDavid Oberhollenzer
When opening files on windows, use the widechar versions and convert from (assumed) UTF-8 to UTF-16 as needed. Since the broken, code-page-random API may acutall be intended in some use cases, leave that option in through an additional flag. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-08-22Tighten bounds checks in sqfs_dir_reader_readerDavid Oberhollenzer
Use the same size check as sqfs_dir_reader_open_dir and report EOF, even if it is possible to read the header itself, but nothing beyond that. Also check if it should be possible to read an entry header before attempting and report EOF if not. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-08-22Fix half done initialization of sqfs_dir_reader_open_dirDavid Oberhollenzer
The sqfs_dir_reader_open_dir function tried to take a short-cut by returning early if the target directory is empty. However, this left some field unchanged from the previous directory. If iterating over a directory and then deciding to enter a sub-directory that happens to be empty, the directory reader will keep the settings for the current directory. After calling sqfs_dir_reader_rewind, the sub-directory will suddenly report the contents of the parent. A similar check is added to the rewind function to not track back on the meta data reader in that case. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-07-21Fix libsquashfs directory writer size accountingDavid Oberhollenzer
The squashfs readdir() implementation in the Linux kernel returns non-existing "." and ".." entries for offsets 0 and 1, and after that reads from disk. For convenience, it was decided to store an off-by-3 value on disk instead of doing complex primary school math to adjust for this. This didn't show up until now, because the kernel implementation trusts the value from the directory header more than the actual size in the inode and happily reads 3 more than the inode would allow it to. This only showed up with 7-zip which subtracts 3 from the size and expects the result to be exact and bails if the directory headers suggest otherwise. And yes, I did consider making a "Holy Hand Granade of Antioch" reference, but consciously decided not to. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-06-25Add default cases for every switch blockDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-06-25Remove casual un-const casting in various placesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-06-25libsquashfs: get rid of potentially unaligned access and VLAsDavid Oberhollenzer
The same problem with the meta data header again, 16 bit read from a buffer: copy the buffer data into a 16 bit variable instead of casting to something potentially unaligned. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-06-07libsquashfs: fix: also preserve alignment flag in block processorDavid Oberhollenzer
Currently, when the block processor aggreagtes fragments into a fragment block, it applies the "don't compress" flag if any of the original framgnets has it set, but the "align to device block" flag is lost. This commit ensures that both flags get applied to the fragment block if set. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-06-07libsquashfs: fix block alignment if requestedDavid Oberhollenzer
1) If the block alignment flag is set, the padding bytes must be inserted _before_ recording the start position, otherwise the resulting image is not readable. 2) Also perform alignment if the flag is set on a fragment block. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-04-08Fix: libsquashfs: add sqfs_free() functionDavid Oberhollenzer
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>
2021-03-30libsqfs: block processor: Fix account for manually submitted blocksDavid Oberhollenzer
This was already in the original block processor but got dropped by accident when restructuring it. The problem manifests itself when manually submitting fragment blocks. They no longer get correct I/O queue tickets, clog up the queue and the processor eventually throws an internal error. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-25Fix fail branch in block processor fragment backendDavid Oberhollenzer
Only clean up the fragment if it hasn't been re-assigned to the fragment block. The NULL check is definitely wrong, because we no longer re-assign it as NULL. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-24Fix block processor queue accountingDavid Oberhollenzer
Dequeuing won't work if we have a backlog of 1 or 2 and the blocks are used for internal buffering. Take that into account, similar to the sync code. Also bump the minimum backlog to 3, just to make absolutely sure we cannot run into a dequeue loop trying to allocate a block. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-23Fix windows build of the thread pool in libsquashfsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-23block processor: Re-implement exact fragment matchingDavid Oberhollenzer
In the hash-table equals callback, if the hash and size match, do an exact, byte-for-byte comparison of the fragment in question. The fragment can either be in a fragment block that is in-flight (for which we have the in-flight list), in the current, unfinished fragment block, or it can be on disk. In the later case, the fragment block is resolved through the fragment table and read back from disk into a scratch buffer and decompressed. After that, the fragment is checked for byte-for-byte equality with the one we resolved through the hash table. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-23block processor: keep duplicate copies of in-flight fragment blocksDavid Oberhollenzer
If we want full, byte-for byte, verification of fragments during de-duplication we need to check back with the blocks already written to disk, or with the ones that are in flight. The previous, extremely hacky approach simply locked up the thread pool and investigated the queues. For the new approach, we treat the thread pool as completely opaque and don't try to touch it. This commit modifies the block processor to keep duplicate copies of each submitted fragment block around, that are cleaned up once the block is dequeued and written to disk. So instead of touching the thread pool, we can simply investigate the in-fligth-block list and the current block, before resorting to reading back fragment blocks from the file. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-22block processor: simplify backlog accountingDavid Oberhollenzer
Simply count the number of blocks we hand out (malloc'ed or recycled) and decrease the counter when we put blocks back for recycling. The sync() part becomes a little more complicated, because we can get stuck with a backlog of 1 or 2 because we have a fragment or current block buffer in use. We also need to accout for this when creating the processor, because we need to be able to request at least 2 blocks without stalling. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-22Cleanup the block processor file structureDavid Oberhollenzer
A cleaner separation between common code, frontend code and backend code is made. The "is this byte blob zero" function is moved out to libutil (with test case and everything) with a more optimized implementation. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-21Fix missing error code initializationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-21Cleanup: Rewrite block processor to use the libutil thread_pool_tDavid Oberhollenzer
Throw out the messy thread pool implementation and temporarily also remove the exact fragment matching for simplicity. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-07Optionally use a pool allocator for rb-tree nodesDavid Oberhollenzer
This commit restructures the rbtree code to optionally use a pool allocator for the nodes. The option is made depenend on the presence of a pre-processor flag. To the configure script is added an option to enable/disable the use of custom allocators. It makes sense to still allow the malloc/free based routes for better ASAN based instrumentation. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-07Rewrite the str_table to internally use the more opimized hash_tableDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Fix: meta reader behaviour if accessing block at location 0David Oberhollenzer
Technically, this should *never* **ever** happen, because a SquashFS file always starts with a super block, which isn't wrapped in a meta data block, so a valid SquashFS file will never have a reason to read from offset 0. However, this does bite us when doing unit tests where the meta reader and writer are used on an otherwise empty file. When trying to read from offset 0, the caching code assumes that we already have that block, since tha block_offset got initialized to 0. This commit changes the initialization to set the current block location to the maximum 64 bit integer, a location we are never going to read from, since it will always be after the limit. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Cleanup: replace ad-hoc dynamic array in sqfs_xattr_writer_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Cleanup: repalce ad-hoc dynamic array used for export tableDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Cleanup: replace ad-hoc dynamic array in sqfs_id_table_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Cleanup: replace ad-hoc dynamic array in sqfs_frag_table_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Store xattr writer block description in a red-black treeDavid Oberhollenzer
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>
2021-02-28added shared read access when opening sqfs image with read-only flags (win32)Thomas Lang
2021-02-10Always use the correct data type for realloc return valueDavid Oberhollenzer
This commit mainly serves the static analysis tooling. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-19libsqfs: Implement exact matching of fragmentsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-19Add a user pointer to the hash table implementationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-19libsqfs: Add a sqfs_block_processor_create_ex functionDavid Oberhollenzer
This function creates a block processor from a structure describing it. A stub implementation for the old sqfs_block_processor_create is added that simply sets up such a struct and forwards the call. The current version of the description struct only contains the exact same parameters and a size field at the beginning. This approach is supposed to make extending the range of parameters easier without breaking ABI compatibillity. Currently already planned are: - Adding a sqfs_file_t pointer to double-check when deduplicating fragments. - When the scanning code reaches a usable state, add the abillity to pass scanned fragment data, so the block processor can be used for appending to an existing image. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-19libsqfs: block processor: removed unused chunk next pointerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-19Fix: Move fragment consolidation back to block processor serial partDavid Oberhollenzer
Keeping a list of fragments stored away in the current fragment block and consolidating them in the thread pool takes them out of circulation. If we have a lot of tiny fragments, this can lead to a situation where all the limit is reached, but we cannot do anything, because we are waiting for a block to complete, but they are all attached to the current fragment block and the queue is empty. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-15Fix more normalization of slashes in filenames.Scott Moser
It looks like the last commit missed a couple more occurences where '\' was treated incorrectly. Fixes were still needed in sqfs_dir_reader_find_by_path and sqfs_dir_reader_get_full_hierarchy. This path is used in extras/browse.c.
2020-12-06libsqfs: implement exact matching in the default block writer.David Oberhollenzer
Instead of comparing (compresed, disk-size, checksum) tuples to find block matches, do an exact, byte-for-byte comparison of the data stored on disk to avoid the possibility of a spurious colision. Since this is the desired behaviour, make it the default, optionally overrideable through a flag. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-11-07Fix: libsquashfs: xattr_writer: return NULL if calloc failsDavid Oberhollenzer
Instead of dereferencing the NULL pointer and crashing. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-08-12Fix block processor single block with don't fragment flag bugDavid Oberhollenzer
This commit fixes a bug where the block processor state machine would not add the "last block" flag if there is only one not entirely filled block and the "don't fragment" flag is set. If the flag isn't set, the inode start block position is not updated and points to the beginning of the image instead. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-08-04Cleanup: move zlib/lz4 code from lib/sqfs/comp/ to lib/David Oberhollenzer
The source code of a modified liblz4 and zlib are included with the option to compile them into libsquashfs if they are not available on the system. So far, the source code was included directly in the compressor sub directory within libsqsuashfs. This commit moves the libraries out into the lib directory. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-07-29Fix: xattr reader: read the header after seaking to an OOL valueDavid Oberhollenzer
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>
2020-06-20Fix block bounds checking in libsquashfs data readerDavid Oberhollenzer
Instead of doing the fragile size comparison in both loops, simply bail from the function if offset is out of bounds, clamp the size to the available range of the file and abail if it is zero. As a result, a lot of checks can be removed and the function will not return data beyond EOF. This problem occoured with files that have a short last block instead of a fragment. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-13Fix: don't include alloca.h on systems that don't provide this headerv1.0.0David Oberhollenzer
This commit fixes a build issue on BSD based systems, where alloca is defined in stdlib.h and there is no such thing as "alloca.h". Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-13Bump the so version number for libsquashfsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>