private void TryParseFileTimestamp(Stream stream)
{
var markerByte = this._stream.ReadByte();
if (markerByte == -1)
{
throw new FormatException("Cannot read further to the o5m-file!");
}
var marker = (O5MFileByteMarker)markerByte;
if (marker != O5MFileByteMarker.FileTimestamp)
{
stream.Position -= 1;
return;
}
var length = VarInt.ParseUInt64(stream);
var buffer = new byte[length];
var readBytes = this._stream.Read(buffer, 0, buffer.Length);
if (readBytes != buffer.Length)
{
throw new FormatException("The .o5m-file has an invalid timestamp-length!");
}
var timestamp = VarInt.ParseInt64(buffer);
this._fileTimestamp = UNIX_START.AddSeconds(timestamp);
}
private void ParseVersionData(
byte[] data,
OSMElement element,
ref int bufferOffset
#if DEBUG
, ElementDebugInfos debugInfos
#endif
)
{
#if DEBUG
var versionPosition = (uint)bufferOffset + 1;
#endif
element.Version = VarInt.ParseUInt64(data, ref bufferOffset);
#if DEBUG
debugInfos.Add(versionPosition, "start of 'version' (" + element.Version + ").");
#endif
if (element.Version == 0)
{
return;
}
#if DEBUG
var timestampOffset = (uint)bufferOffset + 1;
#endif
var timestampDiff = VarInt.ParseInt64(data, ref bufferOffset);
#if DEBUG
debugInfos.Add(timestampOffset, "start of 'timestamp' (diff: " + timestampDiff + ").");
#endif
var unixTimestamp = timestampDiff + this._lastTimestamp;
this._lastTimestamp = unixTimestamp;
element.Timestamp = UNIX_START.AddSeconds(unixTimestamp);
if (unixTimestamp == 0)
{
return;
}
#if DEBUG
var changesetPosition = (uint)bufferOffset + 1;
#endif
element.Changeset = (ulong)(VarInt.ParseInt64(data, ref bufferOffset) + this._lastChangeset);
#if DEBUG
debugInfos.Add(changesetPosition, "start of 'changeset' (" + element.Changeset + ").");
#endif
this._lastChangeset = (long)element.Changeset;
KeyValuePair <byte[], byte[]>?keyValuePair;
if (data[bufferOffset] == 0)
{
#if DEBUG
debugInfos.Add((uint)bufferOffset + 1, "start of 'uid/user'-pair (raw).");
#endif
keyValuePair = StringPair.ParseToByteArrayPair(data, ref bufferOffset);
if (keyValuePair.HasValue)
{
var keyValuePairValue = keyValuePair.Value;
element.UserId = VarInt.ParseUInt64(keyValuePairValue.Key);
element.UserName = Encoding.UTF8.GetString(keyValuePairValue.Value);
if (element.UserId != 0)
{
if (keyValuePairValue.Key.Length + keyValuePairValue.Value.Length <= 250)
{
this._storedStringPairs.Insert(0, keyValuePairValue);
}
}
}
else
{
this._storedStringPairs.Insert(0, new KeyValuePair <byte[], byte[]>(new byte[0], new byte[0]));
}
}
else
{
#if DEBUG
debugInfos.Add((uint)bufferOffset + 1, "start of 'uid/user'-pair (stored).");
#endif
var storedPosition = VarInt.ParseUInt32(data, ref bufferOffset);
if (this._storedStringPairs.ElementExistsAtPosition((int)storedPosition))
{
keyValuePair = this._storedStringPairs[(int)storedPosition - 1];
element.UserId = VarInt.ParseUInt64(keyValuePair?.Key);
element.UserName = Encoding.UTF8.GetString(keyValuePair?.Value);
}
}
}