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2023-06-15Overhaul sqfs_istream_t/sqfs_ostream_t error handlingDavid Oberhollenzer
Report an error number from the implementations, change the users to forward that error number (which also means libtar write header/link now returns an error code) and all subsequent binaries to use sqfs_perror() instead of relying on the function to print an error internally. Also, make sure to preserve errno/GetLastError() in the implementations and print out a stringified error in sqfs_perror() if the error code indicates an I/O error. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-06-15Move sqfs_istream_t & sqfs_ostream_t into libsquashfsDavid Oberhollenzer
For now, only the interfaces and helper functions are moved, the concrete implementations remain in libio. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-06-15Mass rename istream_t/ostream_t with sqfs_ prefixDavid Oberhollenzer
istream_t becomes sqfs_istream_t and ostream_t becomes sqfs_ostream_t Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-06-15libio: remove ostream_append_sparse and fallback implementationDavid Oberhollenzer
Instead of a separate append-sparse function, simply accept NULL as an input for append. For both Unix and Win32, a fallback needs to be implemented. For XFRM, we can just memset the input buffer to zero, same for the libsquashfs data writer. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-06-15libio: remove single line wrapper functionsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-06-11libio: move istream buffer logic into interall callbacksDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-06-11libio: remove precache from istream_advance_bufferDavid Oberhollenzer
Since the user has to call istream_get_buffered_data afterwards anyway, we can do the precache lazily. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-06-10libio: add desired read size to istream_get_buffered_dataDavid Oberhollenzer
This properly maps to all of our use cases and makes istream_precache obsolete. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-06-09libio: remove eof flag from istream_t interfaceDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-06-09libio: eliminate direct access of the interal bufferDavid Oberhollenzer
Instead, go through helper functions, which in a next step can be moved inside the implementation. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-06-05libio: remove buffer_offset from istream_tDavid Oberhollenzer
Instead, make the buffer const, let the user adjust the pointer and size. The offset can then be inferred in precache. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-06-04libio: Move istream_t precache logic into backend implementationDavid Oberhollenzer
The end goal is to remove direct buffer access from the istream_t interfaces and make that opaque. For the tar implementation, this already safes us needless buffer copying, as we essentially allow the user to read-through from the underlying stream. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2023-01-31Move library source into src sub-directoryDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>