1 /** 2 * ae.sys.datamm 3 * 4 * License: 5 * This Source Code Form is subject to the terms of 6 * the Mozilla Public License, v. 2.0. If a copy of 7 * the MPL was not distributed with this file, You 8 * can obtain one at http://mozilla.org/MPL/2.0/. 9 * 10 * Authors: 11 * Vladimir Panteleev <vladimir@thecybershadow.net> 12 */ 13 14 module ae.sys.datamm; 15 16 import std.mmfile; 17 import std.typecons; 18 debug import std.stdio; 19 20 import ae.sys.data; 21 22 alias MmMode = MmFile.Mode; 23 24 // ************************************************************************ 25 26 class MappedDataWrapper : DataWrapper 27 { 28 typeof(scoped!MmFile(null)) mmFile; 29 void[] mappedData; 30 31 this(string name, MmMode mode, size_t from, size_t to) 32 { 33 mmFile = scoped!MmFile(name, mode, 0, null); 34 mappedData = (from || to) ? mmFile.Scoped_payload[from..(to ? to : mmFile.length)] : mmFile.Scoped_payload[]; 35 36 debug(DATA_REFCOUNT) writefln("? -> %s: Created MappedDataWrapper", cast(void*)this); 37 } 38 39 debug(DATA_REFCOUNT) 40 ~this() 41 { 42 writefln("? -> %s: Deleted MappedDataWrapper", cast(void*)this); 43 } 44 45 override @property inout(void)[] contents() inout { return mappedData; } 46 override @property size_t size() const { return mappedData.length; } 47 override void setSize(size_t newSize) { assert(false, "Can't resize MappedDataWrapper"); } 48 override @property size_t capacity() const { return mappedData.length; } 49 } 50 51 auto mapFile(string name, MmMode mode, size_t from = 0, size_t to = 0) 52 { 53 auto wrapper = unmanagedNew!MappedDataWrapper(name, mode, from, to); 54 return Data(wrapper, mode != MmMode.read); 55 }