/////////////////////////////////////////////////////////////////////////////////
//
// Photoshop PSD FileType Plugin for Paint.NET
// http://psdplugin.codeplex.com/
//
// This software is provided under the MIT License:
//   Copyright (c) 2006-2007 Frank Blumenberg
//   Copyright (c) 2010-2014 Tao Yue
//
// See LICENSE.txt for complete licensing and attribution information.
//
/////////////////////////////////////////////////////////////////////////////////

using System;
using System.Collections.Generic;

namespace PhotoshopFile
{
    /// <summary>
    /// The names of the alpha channels.
    /// </summary>
    internal class UnicodeAlphaNames : ImageResource
    {
        public override ResourceID ID
        {
            get { return ResourceID.UnicodeAlphaNames; }
        }

        private List<string> channelNames = new List<string>();
        public List<string> ChannelNames
        {
            get { return channelNames; }
        }

        public UnicodeAlphaNames()
            : base(String.Empty)
        {
        }

        public UnicodeAlphaNames(PsdBinaryReader reader, string name, int resourceDataLength)
            : base(name)
        {
            var endPosition = reader.BaseStream.Position + resourceDataLength;

            while (reader.BaseStream.Position < endPosition)
            {
                var channelName = reader.ReadUnicodeString();

                // Photoshop writes out a null terminator for Unicode alpha names.
                // There is no null terminator on other Unicode strings in PSD files.
                if (channelName.EndsWith("\0"))
                {
                    channelName = channelName.Substring(0, channelName.Length - 1);
                }
                ChannelNames.Add(channelName);
            }
        }
    }
}