/// <summary>
/// Find the child value with the specified index.
/// </summary>
/// <param name="nIndex">
/// Index of the child value to find.
/// </param>
/// <param name="ofStart">
/// Offset within the parent buffer to start search from.
/// </param>
/// <param name="iStart">
/// Index of the child value to start search from.
/// </param>
/// <returns>
/// The child value.
/// </returns>
protected override IPofValue FindChildInternal(int nIndex, int ofStart, int iStart)
{
BinaryMemoryStream buf = (BinaryMemoryStream)BinaryValue.GetStream();
buf.Position = ofStart;
DataReader reader = new DataReader(buf);
// skip children until we either find the one we are looking for,
// or reach the end of the sparse array (index == -1)
int ofLastIndex = ofStart;
int iProp = reader.ReadPackedInt32();
while (iProp < nIndex && iProp >= 0)
{
SkipChild(reader);
ofLastIndex = (int)buf.Position;
iProp = reader.ReadPackedInt32();
}
// child found. extract it from the parent buffer
if (iProp == nIndex)
{
int of = (int)buf.Position;
SkipChild(reader);
int cb = (int)(buf.Position - of);
return(ExtractChild(of, cb));
}
// child not found
return(InstantiateNullValue(ofLastIndex, nIndex));
}
/// <summary>
/// Find the child value with the specified index.
/// </summary>
/// <param name="nIndex">
/// Index of the child value to find.
/// </param>
/// <param name="ofStart">
/// Offset within the parent buffer to start search from.
/// </param>
/// <param name="iStart">
/// Index of the child value to start search from.
/// </param>
/// <returns>
/// The child value.
/// </returns>
protected override IPofValue FindChildInternal(int nIndex, int ofStart, int iStart)
{
BinaryMemoryStream buf = (BinaryMemoryStream)BinaryValue.GetStream();
buf.Position = ofStart;
DataReader reader = new DataReader(buf);
// check array bounds
if (nIndex < 0 || nIndex >= Length)
{
throw new IndexOutOfRangeException(
"Element index " + nIndex + " must be in the range [0 .. "
+ Length + ").");
}
// skip children until we find the one we are looking for
int iProp = iStart;
while (iProp < nIndex)
{
SkipChild(reader);
iProp++;
}
// child found. parse it and return it
int of = (int)buf.Position;
SkipChild(reader);
int cb = (int)(buf.Position - of);
return(ExtractChild(of, cb));
}