private static MemoryStream ReadFileData(
HogFile hog, Hog.FileEntry entry, Stream input)
{
var data = new MemoryStream();
ReadFileData(hog, entry, input, data);
data.Position = 0;
return(data);
}
private static void ReadFileData(
HogFile hog,
Hog.FileEntry entry,
Stream input,
Stream output)
{
if (hog.Files.Contains(entry) == false)
{
throw new ArgumentException("bad entry", "entry");
}
if (entry.Size == -1)
{
throw new ArgumentException("cannot read file with size of -1", "entry");
}
if (entry.Unknown5 != -2 || entry.AttributeId == -1)
{
throw new ArgumentException("strange entry");
}
if (entry.AttributeId < 0 || entry.AttributeId >= hog.Attributes.Count)
{
throw new ArgumentException("entry pointing to invalid metadata", "entry");
}
if ((hog.Attributes[entry.AttributeId].Flags & 1) == 1) // entry is unused
{
throw new ArgumentException("entry referencing unused attribute", "entry");
}
input.Seek(entry.Offset, SeekOrigin.Begin);
var attribute = hog.Attributes[entry.AttributeId];
if (attribute.UncompressedSize != 0)
{
using (var temp = input.ReadToMemoryStream(entry.Size))
{
var zlib = new InflaterInputStream(temp);
output.WriteFromStream(zlib, attribute.UncompressedSize);
}
}
else
{
output.WriteFromStream(input, entry.Size);
}
}
public void Deserialize(Stream input)
{
var magic = input.ReadValueU32(Endian.Little);
if (magic != Signature &&
magic.Swap() != Signature)
{
throw new FormatException("bad hog magic");
}
var endian = magic == Signature ? Endian.Little : Endian.Big;
var version = input.ReadValueU16(endian);
if (version < 10 || version > 11)
{
throw new FormatException("unsupported hog version");
}
var operationJournalSize = input.ReadValueU16(endian);
var fileListSize = input.ReadValueU32(endian);
var attributeListSize = input.ReadValueU32(endian);
var dataListFileNumber = input.ReadValueU32(endian);
var dataListJournalSize = input.ReadValueU32(endian);
if (operationJournalSize > 1024)
{
throw new FormatException("bad hog operation journal size");
}
this.OperationJournal = input.ReadBytes(operationJournalSize);
this.DataListJournal = input.ReadBytes((int)dataListJournalSize);
this.Files.Clear();
using (var data = input.ReadToMemoryStream((int)fileListSize))
{
while (data.Position < data.Length)
{
// ReSharper disable UseObjectOrCollectionInitializer
var entry = new Hog.FileEntry();
// ReSharper restore UseObjectOrCollectionInitializer
entry.Offset = data.ReadValueS64(endian);
entry.Size = data.ReadValueS32(endian);
entry.Timestamp = data.ReadValueU32(endian);
entry.Checksum = data.ReadValueU32(endian);
entry.Unknown4 = data.ReadValueU32(endian);
entry.Unknown5 = data.ReadValueS16(endian);
entry.Unknown6 = data.ReadValueS16(endian);
entry.AttributeId = data.ReadValueS32(endian);
this.Files.Add(entry);
}
}
this.Attributes.Clear();
using (var data = input.ReadToMemoryStream((int)attributeListSize))
{
while (data.Position < data.Length)
{
// ReSharper disable UseObjectOrCollectionInitializer
var entry = new Hog.AttributeEntry();
// ReSharper restore UseObjectOrCollectionInitializer
entry.NameId = data.ReadValueS32(endian);
entry.HeaderDataId = data.ReadValueS32(endian);
entry.UncompressedSize = data.ReadValueU32(endian);
entry.Flags = data.ReadValueU32(endian);
this.Attributes.Add(entry);
}
}
this.Endian = endian;
this.Version = version;
}