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
We have a lot of "chunk_end - start" invocations, let's switch to bytes/cur_bytes scheme instead. While being here, improve check on block_copy_do_copy parameters to not overflow when calculating nbytes and use int64_t for bytes in block_copy for consistency. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20200311103004.7649-7-vsementsov@virtuozzo.com> Signed-off-by: Max Reitz <mreitz@redhat.com>