From 3ecd3c8e3d6643986960d6266d71643df8f7c22e Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Fri, 18 Sep 2015 17:45:34 -0400
Subject: Massive documentation and copyright clean-up.

---
 src/nslcd/proto/io.go | 172 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 src/nslcd/proto/io.go

(limited to 'src/nslcd/proto/io.go')

diff --git a/src/nslcd/proto/io.go b/src/nslcd/proto/io.go
new file mode 100644
index 0000000..3c0c5be
--- /dev/null
+++ b/src/nslcd/proto/io.go
@@ -0,0 +1,172 @@
+// Copyright (C) 2015 Luke Shumaker <lukeshu@sbcglobal.net>
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+// 02110-1301 USA
+
+package nslcd_proto
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+	"net"
+	"reflect"
+	"syscall"
+)
+
+type NslcdError string
+
+func (o NslcdError) Error() string {
+	return string(o)
+}
+
+type nslcdObject interface {
+	nslcdWrite(fd io.Writer)
+}
+
+type nslcdObjectPtr interface {
+	nslcdRead(fd io.Reader)
+}
+
+// Write an object to a stream.  In the event of an error, this
+// function may panic!  Handle it!
+func Write(fd io.Writer, data interface{}) {
+	switch data := data.(type) {
+	// basic data types
+	case nslcdObject:
+		data.nslcdWrite(fd)
+	case []byte:
+		_, err := fd.Write(data)
+		if err != nil {
+			panic(err)
+		}
+	case int32:
+		err := binary.Write(fd, binary.BigEndian, data)
+		if err != nil {
+			panic(err)
+		}
+	// composite datatypes
+	case string:
+		Write(fd, int32(len(data)))
+		Write(fd, []byte(data))
+	case []string:
+		Write(fd, int32(len(data)))
+		for _, item := range data {
+			Write(fd, item)
+		}
+	case net.IP:
+		var af int32 = -1
+		switch len(data) {
+		case net.IPv4len:
+			af = syscall.AF_INET
+		case net.IPv6len:
+			af = syscall.AF_INET6
+		}
+		var bytes []byte
+		if af < 0 {
+			bytes = make([]byte, 0)
+		} else {
+			bytes = data
+		}
+		Write(fd, af)
+		Write(fd, int32(len(bytes)))
+		Write(fd, bytes)
+	case []net.IP:
+		Write(fd, int32(len(data)))
+		for _, item := range data {
+			Write(fd, item)
+		}
+	default:
+		v := reflect.ValueOf(data)
+		switch v.Kind() {
+		case reflect.Struct:
+			for i, n := 0, v.NumField(); i < n; i++ {
+				Write(fd, v.Field(i).Interface())
+			}
+		default:
+			panic(fmt.Sprintf("Invalid structure to write NSLCD protocol data from: %T ( %#v )", data, data))
+		}
+	}
+}
+
+// Read an object from a stream.  In the event of an error, this
+// function may panic!  Handle it!
+func Read(fd io.Reader, data interface{}) {
+	switch data := data.(type) {
+	// basic data types
+	case nslcdObjectPtr:
+		data.nslcdRead(fd)
+	case *[]byte:
+		_, err := fd.Read(*data)
+		if err != nil {
+			panic(err)
+		}
+	case *int32:
+		err := binary.Read(fd, binary.BigEndian, data)
+		if err != nil {
+			panic(err)
+		}
+	// composite datatypes
+	case *string:
+		var len int32
+		Read(fd, &len)
+		buf := make([]byte, len)
+		Read(fd, &buf)
+		*data = string(buf)
+	case *[]string:
+		var num int32
+		Read(fd, &num)
+		*data = make([]string, num)
+		for i := 0; i < int(num); i++ {
+			Read(fd, &((*data)[i]))
+		}
+	case *net.IP:
+		var af int32
+		Read(fd, &af)
+		var _len int32
+		switch af {
+		case syscall.AF_INET:
+			_len = net.IPv4len
+		case syscall.AF_INET6:
+			_len = net.IPv6len
+		default:
+			panic(NslcdError(fmt.Sprintf("incorrect address family specified: %d", af)))
+		}
+		var len int32
+		Read(fd, &len)
+		if len != _len {
+			panic(NslcdError(fmt.Sprintf("address length incorrect: %d", len)))
+		}
+		buf := make([]byte, len)
+		Read(fd, &buf)
+		*data = buf
+	case *[]net.IP:
+		var num int32
+		Read(fd, &num)
+		*data = make([]net.IP, num)
+		for i := 0; i < int(num); i++ {
+			Read(fd, &((*data)[i]))
+		}
+	default:
+		p := reflect.ValueOf(data)
+		v := reflect.Indirect(p)
+		if p == v || v.Kind() != reflect.Struct {
+			panic(fmt.Sprintf("The argument to nslcd_proto/internal.Read() must be a pointer: %T ( %#v )", data, data))
+		}
+		for i, n := 0, v.NumField(); i < n; i++ {
+			Read(fd, v.Field(i).Addr().Interface())
+		}
+	}
+}
-- 
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