internal void Read(Stream stream)
{
stream.Seek(0, SeekOrigin.Begin);
using (var binReader = new BinaryReader(stream, Encoding, true)) {
updateTS = new DateTime(binReader.ReadInt64());
persistTS = new DateTime(binReader.ReadInt64());
Status = (CatalogStatus)binReader.ReadByte();
format = (CatalogFormat)binReader.ReadByte();
pageCount = binReader.ReadInt32();
if (pageCount > 0)
{
binReader.BaseStream.Seek(-pageCount, SeekOrigin.End);
// reading in reverse order
var revContent = binReader.ReadBytes(pageCount);
PageContent = revContent
.Reverse()
.Select(b => (PageType)b);
}
}
if (updateTS > persistTS)
{
Status |= CatalogStatus.Dirty;
}
}
internal static Stream BuilderHeaderBuffer(CatalogStatus status, CatalogFormat format, DateTime update, DateTime persist, params Page[] pages)
{
var mStream = new MemoryStream(new byte[MaxHeaderSize]);
using (var binWriter = new BinaryWriter(mStream, Encoding, true)) {
binWriter.Write(update.Ticks);
binWriter.Write(persist.Ticks);
binWriter.Write((byte)status);
binWriter.Write((byte)format);
binWriter.Write(pages.Length);
if (pages != null && pages.Length > 0)
{
// with pages (Type) in reverse order create PageDescriptor array
var pageTypes = pages.Reverse()
.SelectMany(p => {
var pgDescr = PageDescriptor.Create(new byte[] { 1 });
pgDescr.Write(0, () => (byte)p.Type);
return((byte[])pgDescr);
})
.ToArray();
binWriter.Seek(-pageTypes.Length, SeekOrigin.End);
binWriter.Write(pageTypes, 0, pageTypes.Length);
}
}
return(mStream);
}
internal static FileInfo MakeCatalogFile(string name, CatalogStatus status, CatalogFormat format, DateTime update, DateTime persist, params PageType[] pageContent)
{
var dbPath = new DirectoryInfo(Path.Combine(DataDirectory.FullName, name));
dbPath.Create();
var length = MaxHeaderSize;
var pages = new Page[pageContent.Length];
var i = 0;
foreach (var pc in pageContent)
{
pages[i] = new Page(pc);
length += pages[i].MaxSize;
++i;
}
var headerStream = BuilderHeaderBuffer(status, format, update, persist, pages);
headerStream.Position = 0;
var filePath = Path.Combine(dbPath.FullName, $"{name}.db");
var file = default(FileInfo);
using (var fStream = (file = new FileInfo(filePath)).Create()) {
headerStream.CopyTo(fStream);
foreach (var p in pages)
{
fStream.SetLength(fStream.Length + p.MaxSize);
}
}
return(file);
}
