public void Load(Stream inStream)
{
if (!inStream.CanRead)
{
return;
}
if (!inStream.CanSeek)
{
return;
}
if (inStream.Length < TagGroupHeader.Size)
{
return;
}
resources.Clear();
TagGroup = null;
using (BinaryReader reader = new BinaryReader(inStream))
{
TagGroupHeader header = reader.Read <TagGroupHeader>();
inStream.Seek(TagGroupHeader.Size, SeekOrigin.Begin);
if ((TagGroup = TagLookup.CreateTagGroup(header.GroupTag)) != null)
{
TagGroup.Read(reader);
}
if (header.TagResourceCount > 0)
{
int[] rawOffsets = new int[header.TagResourceCount];
inStream.Seek(header.RawOffsetsOffset, SeekOrigin.Begin);
for (int i = 0; i < header.TagResourceCount; i++)
{
rawOffsets[i] = reader.ReadInt32();
}
int[] lengths = new int[header.TagResourceCount];
inStream.Seek(header.RawLengthsOffset, SeekOrigin.Begin);
for (int i = 0; i < header.TagResourceCount; i++)
{
lengths[i] = reader.ReadInt32();
}
inStream.Seek(header.RawDataOffset, SeekOrigin.Begin);
for (int i = 0; i < header.TagResourceCount; i++)
{
if (!resources.ContainsKey(rawOffsets[i]))
{
resources.Add(rawOffsets[i], reader.ReadBytes(lengths[i]));
}
}
}
}
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(TagGroup)));
}
public void Save(Stream outStream)
{
TagGroupHeader header = new TagGroupHeader
{
AbideTag = "atag",
GroupTag = TagGroup.Tag,
TagResourceCount = (uint)resources.Count,
};
using (BinaryWriter writer = new BinaryWriter(outStream))
using (BinaryReader reader = new BinaryReader(outStream))
{
outStream.Seek(TagGroupHeader.Size, SeekOrigin.Current); // skip header
TagGroup.Write(writer);
if (resources.Count > 0)
{
header.RawOffsetsOffset = (uint)outStream.Align(512);
foreach (int offset in resources.Keys)
{
writer.Write(offset);
}
header.RawLengthsOffset = (uint)outStream.Align(512);
foreach (byte[] resource in resources.Values)
{
writer.Write(resource.Length);
}
header.RawDataOffset = (uint)outStream.Align(512);
foreach (byte[] datum in resources.Values)
{
writer.Write(datum);
}
}
int count = (int)(outStream.Align(16) - TagGroupHeader.Size) / 4;
outStream.Seek(TagGroupHeader.Size, SeekOrigin.Begin);
for (int i = 0; i < count; i++)
{
header.Checksum ^= reader.ReadUInt32();
}
outStream.Seek(0, SeekOrigin.Begin);
writer.Write(header);
}
}
