public DBFile ReadFile(BinaryReader reader, DBFileHeader header, TypeInfo info)
{
reader.BaseStream.Position = header.Length;
DBFile file = new DBFile(header, info);
int i = 0;
while (reader.BaseStream.Position < reader.BaseStream.Length)
{
try
{
file.Entries.Add(ReadFields(reader, info));
i++;
}
catch (Exception x)
{
string message = string.Format("{2} at entry {0}, db version {1}", i, file.Header.Version, x.Message);
throw new DBFileNotSupportedException(message, x);
}
}
if (file.Entries.Count != header.EntryCount)
{
throw new DBFileNotSupportedException(string.Format("Expected {0} entries, got {1}", header.EntryCount, file.Entries.Count));
}
else if (reader.BaseStream.Position != reader.BaseStream.Length)
{
throw new DBFileNotSupportedException(string.Format("Expected {0} bytes, read {1}", header.Length, reader.BaseStream.Position));
}
return(file);
}
/*
* Reads a db file from stream, using the version information
* contained in the header read from it.
*/
public DBFile Decode(Stream stream)
{
BinaryReader reader = new BinaryReader(stream);
reader.BaseStream.Position = 0;
DBFileHeader header = readHeader(reader);
List <TypeInfo> infos = DBTypeMap.GetVersionedInfos(typeName, header.Version);
if (infos.Count == 0)
{
infos.AddRange(DBTypeMap.GetAllInfos(typeName));
}
foreach (TypeInfo realInfo in infos)
{
try
{
#if DEBUG
Console.WriteLine("Parsing version {1} with info {0}", string.Join(",", realInfo.Fields), header.Version);
#endif
DBFile result = ReadFile(reader, header, realInfo);
return(result);
}
catch (Exception) { }
}
return(null);
// throw new DBFileNotSupportedException(string.Format("No applicable type definition found"));
}
/*
* Query if given packed file can be decoded.
* 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.IsSupported(key))
{
try
{
DBFileHeader header = PackedFileDbCodec.readHeader(packedFile);
int maxVersion = DBTypeMap.MaxVersion(key);
if (maxVersion != 0 && header.Version > maxVersion)
{
display = string.Format("{0}: needs {1}, has {2}", key, header.Version, DBTypeMap.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);
}
public override bool Equals(object other)
{
bool result = false;
if (other is DBFileHeader)
{
DBFileHeader header2 = (DBFileHeader)other;
result = GUID.Equals(header2.GUID);
result &= Version.Equals(header2.Version);
result &= EntryCount.Equals(header2.EntryCount);
}
return(result);
}
public static void WriteHeader(BinaryWriter writer, DBFileHeader header)
{
if (header.GUID != "")
{
writer.Write(GUID_MARKER);
IOFunctions.WriteCAString(writer, header.GUID, Encoding.Unicode);
}
if (header.Version != 0)
{
writer.Write(VERSION_MARKER);
writer.Write(header.Version);
}
writer.Write((byte)1);
writer.Write(header.EntryCount);
}
public static DBFileHeader readHeader(BinaryReader reader)
{
byte index = reader.ReadByte();
int version = 0;
string guid = "";
bool hasMarker = false;
uint entryCount = 0;
try
{
if (index != 1)
{
// I don't think those can actually occur more than once per file
while (index == 0xFC || index == 0xFD)
{
var bytes = new List <byte>(4);
bytes.Add(index);
bytes.AddRange(reader.ReadBytes(3));
UInt32 marker = BitConverter.ToUInt32(bytes.ToArray(), 0);
if (marker == GUID_MARKER)
{
guid = IOFunctions.ReadCAString(reader, Encoding.Unicode);
index = reader.ReadByte();
}
else if (marker == VERSION_MARKER)
{
hasMarker = true;
version = reader.ReadInt32();
index = reader.ReadByte();
// break;
}
else
{
throw new DBFileNotSupportedException(string.Format("could not interpret {0}", marker));
}
}
}
entryCount = reader.ReadUInt32();
}
catch
{
}
DBFileHeader header = new DBFileHeader(guid, version, entryCount, hasMarker);
return(header);
}
/*
* Add data contained in the given db file to this one.
*/
public void Import(DBFile file)
{
if (CurrentType.Name != file.CurrentType.Name)
{
throw new DBFileNotSupportedException
("File type of imported DB doesn't match that of the currently opened one", this);
}
// check field type compatibility
for (int i = 0; i < file.CurrentType.Fields.Count; i++)
{
if (file.CurrentType.Fields [i].TypeCode != CurrentType.Fields [i].TypeCode)
{
throw new DBFileNotSupportedException
("Data structure of imported DB doesn't match that of currently opened one at field " + i, this);
}
}
DBFileHeader h = file.Header;
Header = new DBFileHeader(h.GUID, h.Version, h.EntryCount, h.HasVersionMarker);
CurrentType = file.CurrentType;
// this.entries = new List<List<FieldInstance>> ();
entries.AddRange(file.entries);
Header.EntryCount = (uint)entries.Count;
}
/*
* Create copy of given header.
*/
public DBFileHeader(DBFileHeader toCopy) : this(toCopy.GUID, toCopy.Version, 0, toCopy.HasVersionMarker)
{
}
/*
* Create copy of the given db file.
*/
public DBFile(DBFile toCopy) : this(toCopy.Header, toCopy.CurrentType)
{
Header = new DBFileHeader(toCopy.Header.GUID, toCopy.Header.Version, toCopy.Header.EntryCount, toCopy.Header.HasVersionMarker);
// we need to create a new instance for every field so we don't write through to the old data
toCopy.entries.ForEach(entry => entries.Add(new DBRow(toCopy.CurrentType, entry)));
}
/*
* Create db file with the given header and the given type.
*/
public DBFile(DBFileHeader h, TypeInfo info)
{
Header = h;
CurrentType = info;
}
