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path: root/lib/sqfs/data_reader.c
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2019-07-12Add generic support for reading files without fragmentsDavid Oberhollenzer
This commit extends the special case handling for sparse files to generically support reading files that don't have a fragment but instead have a trunkated final block. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-28Add support for unpacking sparse files as sparse filesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-28Add support for packing sparse filesDavid Oberhollenzer
This commit adds support for packing sparse files into squashfs images as follows: - In the data writer: simply detect zero blocks and write a zero to the block size field and don't emit any data. Record the number of bytes saved this way. For fragments, set the fragment offset to invalid. - In the inode writer: write out the number of bytes saved for sparse files. If there should be a fragment but there is none, append a block count of 0. - In the data reader: if the block size is 0, read nothing from disk and emit an empty block. Do the same if the fragment is missing. - In the inode reader: restore the number of bytes saved for sparse files. The sparse files can be packed and unpacked, but the unpacking will not create sparse files for now. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-11Move file extraction code to generic data_reader_t in libsquashfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>