Write a loose blob to the Object Database from a provider of chunks of data.

Provided the hintpath parameter is filled, its value will help to determine what git filters should be applied to the object before it can be placed to the object database.

The implementation of the callback has to respect the following rules:

• content will have to be filled by the consumer. The maximum number of bytes that the buffer can accept per call is defined by the max_length parameter. Allocation and freeing of the buffer will be taken care of by the function.

• The callback is expected to return the number of bytes that content have been filled with.

• When there is no more data to stream, the callback should return 0. This will prevent it from being invoked anymore.

• When an error occurs, the callback should return -1.