Added a check for reading a zero length buffer to prevent division by zero when reading gzipped files. readRawAllVolumes was wrongly using swapsize instead of size to calculate buffer length.
Added a check for reading a zero length buffer to prevent division by zero when reading gzipped files.
readRawAllVolumes was wrongly using swapsize instead of size to calculate buffer length.

spinicist/old_QUIT,spinicist/old_QUIT,spinicist/old_QUIT,spinicist/old_QUIT