BGZFStreams.BGZFStream
— TypeBGZFStream(io::IO[, mode::AbstractString="r"])
BGZFStream(filename::AbstractString[, mode::AbstractString="r"])
Create an I/O stream for the BGZF compression format.
The first argument is either an IO
object or a filename. If mode
is "r"
(read) the BGZF stream will be in read mode and decompress the underlying BGZF blocks while reading. In read mode, BGZFStream
supports the seek
operation using a virtual file offset (see VirtualOffset
). If mode
is "w"
(write) or "a"
(append) the BGZF stream will be in write mode and compress written data to BGZF blocks.
BGZFStreams.VirtualOffset
— MethodVirtualOffset(block_offset::Integer, inblock_offset::Integer)
Create a virtual file offset from block_offset
and inblock_offset
.
block_offset
is an offset pointing to the beggining position of a BGZF block in a BGZF file and inblock_offset
is an offset pointing to the begining position of a binary data within a uncompressed BGZF block. These values are zero-based and their valid ranges are [0, 1 << 48) and [0, 1 << 16), respectively.
BGZFStreams.virtualoffset
— Methodvirtualoffset(stream::BGZFStream)
Return the current virtual file offset of stream
.