9 Slice::Slice(Seekable &b, SeekOffset s, SeekOffset l):
17 throw invalid_argument("Slice");
19 Base::Synchronize sync(below);
20 mode = below.get_mode()&M_RDWR;
21 below.signal_flush_required.connect(sigc::mem_fun(this, &Slice::flush));
24 void Slice::set_block(bool)
26 throw logic_error("Slice::set_block");
34 unsigned Slice::prepare_op(unsigned size, Mode m)
40 SeekOffset pos = below.seek(start_offset+position, S_BEG)-start_offset;
42 throw runtime_error("failed to restore position");
43 sync_position = false;
46 SeekOffset remaining = length-position;
49 if(!size && m==M_READ)
55 unsigned Slice::do_write(const char *data, unsigned size)
57 Base::Synchronize sync(below);
58 size = prepare_op(size, M_WRITE);
62 unsigned len = below.write(data, size);
67 unsigned Slice::do_read(char *data, unsigned size)
69 Base::Synchronize sync(below);
70 size = prepare_op(size, M_READ);
74 unsigned len = below.read(data, size);
75 if(!len && below.eof())
81 unsigned Slice::put(char c)
83 Base::Synchronize sync(below);
84 if(!prepare_op(1, M_WRITE))
87 unsigned len = below.put(c);
94 Base::Synchronize sync(below);
95 if(!prepare_op(1, M_READ))
99 if(c==-1 && below.eof())
106 const Handle &Slice::get_handle(Mode)
108 throw logic_error("Slice::get_handle");
111 SeekOffset Slice::seek(SeekOffset off, SeekType type)
113 Base::Synchronize sync(below);
120 throw invalid_argument("Slice::seek");
122 if(off<start_offset || off>start_offset+length)
123 throw bad_seek(off, type);
125 signal_flush_required.emit();
127 position = below.seek(off, S_BEG)-start_offset;
128 sync_position = false;