Fix assertion when sparse files don't end on a block boundary #51
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op_read() can fail an assertion if the last block of a file is sparse and the file length does not divide evenly by the block size. Test case:
The log reports:
The sha1sum command (and further operations on the filesystem) fail with ENOTCONN.
This filesystem uses 4kB blocks. Offsets 0x20220 - 0x103084 of the file are all zeroes; therefore only blocks 0-32 are present on disk:
hexdump -C confirmationui.b04
ends with:Change op_read() so that it takes the remaining transfer bytes into account instead of always returning |BLOCK_SIZE| zeroes when reading a sparse block.
I also added a new check to test case 0014 to catch this error.