public static ContentDatabaseSession OpenDatabase(string path)
{
//Open file
DatabaseFile file = DatabaseFile.LoadFile(path);
//Open DB
var db = new ContentDatabaseSession(file);
//Read TOC
if (db.tocPage != -1)
{
//Read blob
byte[] tocBytes = file.ReadBlob(db.tocPage);
int count = tocBytes.Length / TOC_ENTRY_LENGTH;
BufferBinaryTool reader = new BufferBinaryTool(tocBytes);
//Add all
for (int i = 0; i < count; i++)
{
int offset = TOC_ENTRY_LENGTH * i;
DatabaseObjectHeader entry = new DatabaseObjectHeader();
entry.object_id = reader.ReadUInt64(offset + 0);
entry.page_id = reader.ReadUInt64(offset + 8);
entry.commit_id = reader.ReadUInt64(offset + 16);
entry.group_id = reader.ReadInt32(offset + 24);
entry.commit_type = tocBytes[offset + 28];
entry.flags = tocBytes[offset + 29];
entry.reserved = reader.ReadUInt16(offset + 30);
db.objects.Add(entry);
}
}
//Read Name Table
if (db.nameTablePage != -1)
{
//Read blob
byte[] ntBytes = file.ReadBlob(db.nameTablePage);
BufferBinaryTool reader = new BufferBinaryTool(ntBytes);
//Begin reading
int index = 0;
while (index < ntBytes.Length)
{
//Read length
int length = reader.ReadInt32(index);
//Read string
db.nameTable.Add(Encoding.ASCII.GetString(ntBytes, index + 4, length));
//Update
index += length + 4;
}
}
return(db);
}
/* File store */
private void LowLevelUpsertObject(ulong id, ulong commit_id, int group_id, byte commit_type, byte[] payload)
{
//Look for an existing entry with this ID
DatabaseObjectHeader entry = null;
foreach (var e in objects)
{
if (e.object_id == id)
{
entry = e;
}
}
//Update or add the payload data
long payloadPage;
if (entry == null)
{
payloadPage = file.WriteNewBlob(PAGE_TYPE_OBJECT, payload); //Make a new blob
}
else
{
payloadPage = file.UpdateBlob((long)entry.page_id, PAGE_TYPE_OBJECT, payload); //Update existing blob
}
//Update or create entry
if (entry == null)
{
entry = new DatabaseObjectHeader
{
object_id = id,
page_id = (ulong)payloadPage,
commit_id = commit_id,
group_id = group_id,
commit_type = commit_type,
flags = 0,
reserved = 0
};
objects.Add(entry);
}
else
{
entry.page_id = (ulong)payloadPage;
entry.commit_id = commit_id;
entry.group_id = group_id;
entry.commit_type = commit_type;
entry.flags = 0;
entry.reserved = 0;
}
//Note that we do NOT update the TOC. That will be done when this is fully commited
}
