Returns the contents of a #GMappedFile.
Note that the contents may not be zero-terminated, even if the #GMappedFile is backed by a text file.
If the file is empty then null is returned.
the contents of file, or null.
Returns the contents of a #GMappedFile.
Note that the contents may not be zero-terminated, even if the #GMappedFile is backed by a text file.
If the file is empty then null is returned.