/// <summary>
/// Read and preprocess header information
/// </summary>
private void ReadPreprocess()
{
char[] gtag;
#region Endian Switch
ushort us_temp = InputStream.ReadUInt16();
if (us_temp == HeaderEndian)
{
SetEndianState(IO.EndianState.Little);
}
else if (us_temp == HeaderEndianSwap)
{
SetEndianState(IO.EndianState.Big);
}
else
{
throw new Debug.ExceptionLog("File: Invalid switch! {0:X4}", us_temp);
}
#endregion
#region Version
us_temp = InputStream.ReadUInt16();
Debug.Assert.If(us_temp == HeaderVersion,
"File: mismatching file version! [{0}, !{1}",
HeaderVersion, us_temp);
#endregion
#region Signature
gtag = InputStream.ReadTag();
Debug.Assert.If(TagGroup.Test(gtag, (char[])IO.TagGroups.BlamLib),
"File: invalid signature! [{0} !{1}]",
IO.TagGroups.BlamLib.TagToString(), new string(gtag));
#endregion
flags.Reset((uint)(InputStream.ReadUInt16() << 16) | flags);
#region Data Version
us_temp = InputStream.ReadUInt16();
Debug.Assert.If(us_temp == data.Attribute.Version,
"File: mismatching data version! [{0}, !{1}",
data.Attribute.Version, us_temp);
#endregion
#region Data Signature
gtag = InputStream.ReadTag();
Debug.Assert.If(TagGroup.Test(gtag, (char[])data.GroupTag),
"File: invalid data signature! [{0} !{1}]",
data.GroupTag.TagToString(), new string(gtag));
#endregion
#region Data Directories
InputStream.ReadInt32();
InputStream.ReadInt32();
#endregion
#region Data
InputStream.ReadInt32();
int data_offset = InputStream.ReadInt32();
#endregion
Debug.Assert.If(InputStream.Position == HeaderSize,
"File: Update header size! [{0}, !{1}]", HeaderSize, InputStream.Position);
InputStream.Seek(data_offset);
}
/// <summary>
/// Determines the <see cref="BlamVersion"/> from the provided four character code
/// </summary>
/// <param name="group_tag">game four character code</param>
/// <returns></returns>
/// <exception cref="Debug.Exceptions.UnreachableException"><paramref name="group_tag"/> doesn't match any expected groups</exception>
public static BlamVersion VersionFromTag(char[] group_tag)
{
if (TagGroup.Test(group_tag, (char[])blam))
{
return(BlamVersion.Halo1);
}
else if (TagGroup.Test(group_tag, (char[])blam2a))
{
return(BlamVersion.Halo2);
}
else if (TagGroup.Test(group_tag, (char[])blam2b))
{
return(BlamVersion.Halo2);
}
else if (TagGroup.Test(group_tag, (char[])blam2c))
{
return(BlamVersion.Halo2);
}
else if (TagGroup.Test(group_tag, (char[])blam2d))
{
return(BlamVersion.Halo2);
}
else if (TagGroup.Test(group_tag, (char[])blm2))
{
return(BlamVersion.Halo2);
}
else if (TagGroup.Test(group_tag, (char[])blm3))
{
return(BlamVersion.Halo3);
}
else if (TagGroup.Test(group_tag, (char[])stub))
{
return(BlamVersion.Stubbs);
}
else
{
throw new Debug.Exceptions.UnreachableException();
}
}