internal static BTreePage Parse(ReaderBase reader, uint page)
{
// Read header
reader.SeekPage(page);
if (page == 1)
{
// Skip the first 100 bytes
reader.Skip(DatabaseHeader.HeaderSize);
}
BTreeHeader header = BTreeHeader.Parse(reader);
// Read cells
ushort[] cellOffsets = new ushort[header.CellCount];
for (ushort i = 0; i < header.CellCount; i++)
{
cellOffsets[i] = reader.ReadUInt16();
}
Array.Sort(cellOffsets);
BTreePage res;
switch (header.Type)
{
case BTreeType.InteriorIndexBtreePage:
throw new ArgumentOutOfRangeException();
case BTreeType.InteriorTableBtreePage:
res = new BTreeInteriorTablePage(reader, page, header, cellOffsets);
break;
case BTreeType.LeafIndexBtreePage:
throw new ArgumentOutOfRangeException();
case BTreeType.LeafTableBtreePage:
res = new BTreeLeafTablePage(reader, page, header, cellOffsets);
break;
default:
throw new ArgumentOutOfRangeException();
}
res.ParseInternal();
return(res);
}
internal static DatabaseHeader Parse(ReaderBase reader)
{
// The header is 100 bytes
reader.CheckSize(100);
reader.CheckMagicBytes(_expectedHeader);
// Read header
DatabaseHeader res = new DatabaseHeader();
res.PageSize = reader.ReadUInt16();
res.WriteVersion = (FileWriteVersion)reader.ReadByte();
res.ReadVersion = (FileReadVersion)reader.ReadByte();
res.ReservedSpaceAtEndOfPage = reader.ReadByte();
res.MaximumEmbeddedPayloadFraction = reader.ReadByte();
res.MinimumEmbeddedPayloadFraction = reader.ReadByte();
res.LeafPayloadFraction = reader.ReadByte();
res.ChangeCounter = reader.ReadUInt32();
res.DatabaseSizeInPages = reader.ReadUInt32();
res.FirstFreelistTrunkPage = reader.ReadUInt32();
res.FreeListPages = reader.ReadUInt32();
res.SchemaCookie = reader.ReadUInt32();
res.SchemaFormat = reader.ReadUInt32();
res.DefaultPageCacheSize = reader.ReadUInt32();
res.Value7 = reader.ReadUInt32();
res.TextEncoding = (SqliteEncoding)reader.ReadUInt32();
res.UserVersion = reader.ReadUInt32();
res.IncrementalVacuumMode = reader.ReadUInt32();
res.ApplicationId = reader.ReadUInt32();
reader.Skip(20);
res.VersionValidFor = reader.ReadUInt32();
res.Version = reader.ReadUInt32();
// TODO: Warn/err on mismatch with expected values
return(res);
}
