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- // Copyright (C) 2020 The Syncthing Authors.
- //
- // This Source Code Form is subject to the terms of the Mozilla Public
- // License, v. 2.0. If a copy of the MPL was not distributed with this file,
- // You can obtain one at https://mozilla.org/MPL/2.0/.
- package fs
- import (
- "syscall"
- )
- type copyRangeImplementationBasicFile func(src, dst basicFile, srcOffset, dstOffset, size int64) error
- func copyRangeImplementationForBasicFile(impl copyRangeImplementationBasicFile) copyRangeImplementation {
- return func(src, dst File, srcOffset, dstOffset, size int64) error {
- src = unwrap(src)
- dst = unwrap(dst)
- // Then see if it's basic files
- srcFile, srcOk := src.(basicFile)
- dstFile, dstOk := dst.(basicFile)
- if !srcOk || !dstOk {
- return syscall.ENOTSUP
- }
- return impl(srcFile, dstFile, srcOffset, dstOffset, size)
- }
- }
- func withFileDescriptors(first, second basicFile, fn func(first, second uintptr) (int, error)) (int, error) {
- fc, err := first.SyscallConn()
- if err != nil {
- return 0, err
- }
- sc, err := second.SyscallConn()
- if err != nil {
- return 0, err
- }
- var n int
- var ferr, serr, fnerr error
- ferr = fc.Control(func(first uintptr) {
- serr = sc.Control(func(second uintptr) {
- n, fnerr = fn(first, second)
- })
- })
- if ferr != nil {
- return n, ferr
- }
- if serr != nil {
- return n, serr
- }
- return n, fnerr
- }
- func unwrap(f File) File {
- for {
- if wrapped, ok := f.(interface{ unwrap() File }); ok {
- f = wrapped.unwrap()
- } else {
- return f
- }
- }
- }
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