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23 #ifndef INCLUDED_GR_FILE_DESCRIPTOR_SOURCE_H
24 #define INCLUDED_GR_FILE_DESCRIPTOR_SOURCE_H
40 virtual int read_items(
char *buf,
int nitems) = 0;
41 virtual int handle_residue(
char *buf,
int nbytes_read) = 0;
42 virtual void flush_residue() = 0;