/*
* Query if given packed file can be deccoded.
* Is not entirely reliable because it only reads the header and checks if a
* type definition is available for the given GUID and/or type name and version.
* The actual decode tries out all available type infos for that type name
* but that is less efficient because it has to read the whole file at least once
* if successful.
*/
public static bool CanDecode(PackedFile packedFile, out string display)
{
bool result = true;
string key = DBFile.Typename(packedFile.FullPath);
if (DBTypeMap.Instance.IsSupported(key))
{
try {
DBFileHeader header = PackedFileDbCodec.readHeader(packedFile);
int maxVersion = DBTypeMap.Instance.MaxVersion(key);
if (maxVersion != 0 && header.Version > maxVersion)
{
display = string.Format("{0}: needs {1}, has {2}", key, header.Version, DBTypeMap.Instance.MaxVersion(key));
result = false;
}
else
{
display = string.Format("Version: {0}", header.Version);
}
} catch (Exception x) {
display = string.Format("{0}: {1}", key, x.Message);
}
}
else
{
display = string.Format("{0}: no definition available", key);
result = false;
}
return(result);
}
private void AddFromPacked(PackedFile packed)
{
if (packed.Size != 0)
{
string type = DBFile.Typename(packed.FullPath);
DBFileHeader header = PackedFileDbCodec.readHeader(packed);
int currentMaxVersion;
if (!maxVersion.TryGetValue(type, out currentMaxVersion))
{
currentMaxVersion = header.Version;
}
else
{
currentMaxVersion = Math.Max(header.Version, currentMaxVersion);
}
maxVersion[type] = currentMaxVersion;
}
}
// this could do with an update; since the transition to schema.xml,
// we also know obsolete fields and can remove them,
// and we can add fields in the middle instead of assuming they got appended.
public void UpdatePackedFile(PackedFile packedFile)
{
string key = DBFile.Typename(packedFile.FullPath);
if (DBTypeMap.Instance.IsSupported(key))
{
PackedFileDbCodec codec = PackedFileDbCodec.FromFilename(packedFile.FullPath);
int maxVersion = DBTypeMap.Instance.MaxVersion(key);
DBFileHeader header = PackedFileDbCodec.readHeader(packedFile);
if (header.Version < maxVersion)
{
// found a more recent db definition; read data from db file
DBFile updatedFile = PackedFileDbCodec.Decode(packedFile);
TypeInfo dbFileInfo = updatedFile.CurrentType;
TypeInfo targetInfo = GetTargetTypeInfo(key, maxVersion);
if (targetInfo == null)
{
throw new Exception(string.Format("Can't decide new structure for {0} version {1}.", key, maxVersion));
}
// identify FieldInstances missing in db file
for (int i = 0; i < targetInfo.Fields.Count; i++)
{
FieldInfo oldField = dbFileInfo[targetInfo.Fields[i].Name];
if (oldField == null)
{
foreach (List <FieldInstance> entry in updatedFile.Entries)
{
entry.Insert(i, targetInfo.Fields[i].CreateInstance());
}
}
}
//updatedFile.Header.GUID = guid;
updatedFile.Header.Version = maxVersion;
packedFile.Data = codec.Encode(updatedFile);
}
}
}