Gets a Buffer containing data from this starting at
offset.
The size of the returned chunk is unspecified. You can iterate through the entire body by first calling get_chunk with an offset of 0, and then on each successive call, increment the offset by the length of the previously-returned chunk.
If offset is greater than or equal to the total length of this, then the return value
depends on whether or not complete has been called or not; if it has, then
get_chunk will return a 0-length chunk (indicating the end of this). If it
has not, then get_chunk will return null (indicating that this
may still potentially have more data, but that data is not currently available).
| this | |
| offset |
an offset |
|
a Buffer, or |