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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 net

import (
        "io"
        "os"
        "syscall"
)

type sendfileOp struct {
        anOp
        src syscall.Handle // source
        n   uint32
}

func (o *sendfileOp) Submit() (err error) {
        return syscall.TransmitFile(o.fd.sysfd, o.src, o.n, 0, &o.o, nil, syscall.TF_WRITE_BEHIND)
}

func (o *sendfileOp) Name() string {
        return "TransmitFile"
}

// sendFile copies the contents of r to c using the TransmitFile
// system call to minimize copies.
//
// if handled == true, sendFile returns the number of bytes copied and any
// non-EOF error.
//
// if handled == false, sendFile performed no work.
//
// Note that sendfile for windows does not suppport >2GB file.
func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
        var n int64 = 0 // by default, copy until EOF

        lr, ok := r.(*io.LimitedReader)
        if ok {
                n, r = lr.N, lr.R
                if n <= 0 {
                        return 0, nil, true
                }
        }
        f, ok := r.(*os.File)
        if !ok {
                return 0, nil, false
        }

        c.wio.Lock()
        defer c.wio.Unlock()
        c.incref()
        defer c.decref()

        var o sendfileOp
        o.Init(c, 'w')
        o.n = uint32(n)
        o.src = f.Fd()
        done, err := iosrv.ExecIO(&o, 0)
        if err != nil {
                return 0, err, false
        }
        if lr != nil {
                lr.N -= int64(done)
        }
        return int64(done), nil, true
}