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// Copyright 2011 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package mmap import ( "fmt" "os" "syscall" "unsafe" "internal/syscall/windows" ) func mmapFile(f *os.File) (Data, error) { st, err := f.Stat() if err != nil { return Data{}, err } size := st.Size() if size == 0 { return Data{f, nil}, nil } h, err := syscall.CreateFileMapping(syscall.Handle(f.Fd()), nil, syscall.PAGE_READONLY, 0, 0, nil) if err != nil { return Data{}, fmt.Errorf("CreateFileMapping %s: %w", f.Name(), err) } addr, err := syscall.MapViewOfFile(h, syscall.FILE_MAP_READ, 0, 0, 0) if err != nil { return Data{}, fmt.Errorf("MapViewOfFile %s: %w", f.Name(), err) } var info windows.MemoryBasicInformation err = windows.VirtualQuery(addr, &info, unsafe.Sizeof(info)) if err != nil { return Data{}, fmt.Errorf("VirtualQuery %s: %w", f.Name(), err) } data := unsafe.Slice((*byte)(unsafe.Pointer(addr)), int(info.RegionSize)) return Data{f, data}, nil }
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