internal static IEnumerable <SubrecordPinFrame> EnumerateSubrecords(ReadOnlyMemorySlice <byte> span, GameConstants meta, int loc, ICollection <RecordType> lengthOverflowTypes)
{
while (loc < span.Length)
{
var subFrame = new SubrecordPinFrame(meta, span.Slice(loc), loc);
if (lengthOverflowTypes.Contains(subFrame.RecordType))
{ // Length overflow record
var nextLen = subFrame.AsUInt32();
loc += subFrame.TotalLength;
var nextSpan = span.Slice(loc, checked ((int)(nextLen + meta.SubConstants.HeaderLength)));
var subHeader = new SubrecordHeader(meta, nextSpan);
yield return(SubrecordPinFrame.FactoryNoTrim(subHeader, nextSpan, loc));
loc += checked ((int)(subHeader.HeaderLength + nextLen));
continue;
}
yield return(subFrame);
loc += subFrame.TotalLength;
}
}
/// <summary>
/// Enumerates locations of the contained subrecords, while considering some specified RecordTypes as special length overflow subrecords.<br/>
/// These length overflow subrecords will be skipped, and simply used to parse the next subrecord properly.<br />
/// Locations are relative to the RecordType of the MajorRecordFrame.
/// </summary>
/// <param name="majorFrame">MajorRecordFrame to iterate</param>
/// <param name="lengthOverflowTypes">Collection of known RecordTypes that signify a length overflow subrecord</param>
public static IEnumerable <SubrecordPinFrame> EnumerateSubrecords(this MajorRecordFrame majorFrame, ICollection <RecordType> lengthOverflowTypes)
{
int loc = majorFrame.HeaderLength;
while (loc < majorFrame.HeaderAndContentData.Length)
{
var subFrame = new SubrecordPinFrame(majorFrame.Meta, majorFrame.HeaderAndContentData.Slice(loc), loc);
if (lengthOverflowTypes.Contains(subFrame.RecordType))
{ // Length overflow record
var nextLen = subFrame.AsUInt32();
loc += subFrame.TotalLength;
var span = majorFrame.HeaderAndContentData.Slice(loc, checked ((int)(nextLen + majorFrame.Meta.SubConstants.HeaderLength)));
var subHeader = new SubrecordHeader(majorFrame.Meta, span);
yield return(SubrecordPinFrame.FactoryNoTrim(subHeader, span, loc));
continue;
}
yield return(subFrame);
loc += subFrame.TotalLength;
}
}
