/// <summary>
/// Loads the specified stream in the CSV-like UTF8 format it was written by the <see cref="Save(Stream)"/> method.
/// </summary>
/// <param name="stream">The stream.</param>
/// <returns>The loaded index from the specified stream.</returns>
public static VideoSeekIndex Load(Stream stream)
{
var separator = new[] { ',' };
var trimQuotes = new[] { '"' };
var result = new VideoSeekIndex(null, -1);
using (var reader = new StreamReader(stream, Encoding.UTF8, true))
{
var state = 0;
while (reader.EndOfStream == false)
{
var line = reader.ReadLine()?.Trim() ?? string.Empty;
if (state == 0 && line == SectionHeaderText)
{
state = 1;
continue;
}
if (state == 1 && line == SectionHeaderFields)
{
state = 2;
continue;
}
if (state == 2 && !string.IsNullOrWhiteSpace(line))
{
var parts = line.Split(separator, 2);
if (parts.Length >= 2)
{
if (int.TryParse(parts[0], out var index))
{
result.StreamIndex = index;
}
result.MediaSource = parts[1]
.Trim(trimQuotes)
.ReplaceOrdinal("\"\"", "\"");
}
state = 3;
}
if (state == 3 && line == SectionDataText)
{
state = 4;
continue;
}
if (state == 4 && line == SectionDataFields)
{
state = 5;
continue;
}
if (state == 5 && !string.IsNullOrWhiteSpace(line))
{
if (VideoSeekIndexEntry.FromCsvString(line) is VideoSeekIndexEntry entry)
{
result.Entries.Add(entry);
}
}
}
}
return(result);
}