/*
NAME
  amf_headers.go

DESCRIPTION
  See Readme.md

AUTHORS
  Saxon Nelson-Milton <saxon@ausocean.org>

LICENSE
  amf_headers.go is Copyright (C) 2017 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  under the terms of the GNU General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your
  option) any later version.

  It 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 General Public License
  for more details.

  You should have received a copy of the GNU General Public License
  along with revid in gpl.txt.  If not, see http://www.gnu.org/licenses.

	Derived from librtmp under the GNU Lesser General Public License 2.1
	Copyright (C) 2005-2008 Team XBMC http://www.xbmc.org
	Copyright (C) 2008-2009 Andrej Stepanchuk
	Copyright (C) 2009-2010 Howard Chu
*/
package rtmp

import (
	"unsafe"
)

const (
	AMF_NUMBER = iota
	AMF_BOOLEAN
	AMF_STRING
	AMF_OBJECT
	AMF_MOVIECLIP /* reserved, not used */
	AMF_NULL
	AMF_UNDEFINED
	AMF_REFERENCE
	AMF_ECMA_ARRAY
	AMF_OBJECT_END
	AMF_STRICT_ARRAY
	AMF_DATE
	AMF_LONG_STRING
	AMF_UNSUPPORTED
	AMF_RECORDSET /* reserved, not used */
	AMF_XML_DOC
	AMF_TYPED_OBJECT
	AMF_AVMPLUS /* switch to AMF3 */
	AMF_INVALID = 0xff
)

// typedef enum
// amf.h +40
type C_AMFDataType int32

// typedef struct C_AVal
// amf.h +57
type C_AVal struct {
	av_val *byte
	av_len int32
}

// C_AVal is in amf.h
// amf.h +62
func AVC(str string) C_AVal {
	var aval C_AVal
	if len(str) != 0 {
		aval.av_val = &([]byte(str)[0])
	} else {
		aval.av_val = nil
	}
	aval.av_len = int32(len(str))
	return aval
}

func CAV(av *C_AVal) string {
	return string((*[_Gi]byte)(unsafe.Pointer(av.av_val))[:av.av_len])
}

// #define AVMATCH(a1,a2)
// amf.h +63
func C_AVMATCH(a1, a2 *C_AVal) int32 {
	if a1.av_len == a2.av_len && memcmp(unsafe.Pointer(a1.av_val),
		unsafe.Pointer(a2.av_val), int(a1.av_len)) == 0 {
		return 1
	} else {
		return 0
	}
}

// typedef struct AMF_Object
// amf.h +67
type C_AMFObject struct {
	o_num   int32
	o_props *C_AMFObjectProperty
}

// typedef struct P_vu
// amf.h +73
type P_vu struct {
	p_number float64
	p_aval   C_AVal
	p_object C_AMFObject
}

// typedef struct AMFObjectProperty
// amf.h +79
type C_AMFObjectProperty struct {
	p_name      C_AVal
	p_type      C_AMFDataType
	p_vu        P_vu
	p_UTCoffset int16
}