/*
* internal UInt32 ReadEncodedInt()
* {
* byte first = B.ReadByte();
* if ((first & 0x80) == 0)
* return first;
* byte second = B.ReadByte();
* if ((first & 0xC0) == 0x80)
* return ((uint)(first & 0x7F)) << 8 | second;
* else if ((first & 0xE0) == 0xC0)
* {
* byte third = B.ReadByte();
* byte fourth = B.ReadByte();
* return ((uint)(first & 0x1F) << 24) | ((uint)second) << 16 | ((uint)third) << 8 | (uint)fourth;
* }
* else
* throw new BadImageFormatException(Res.InvalidCompressedInt);
* }
*/
internal MetadataToken ReadMetadataToken(Encodings E)
{
UInt32 Code = (MetadataTokenSize(E) == 2) ? B.ReadUInt16() : B.ReadUInt32();
MetadataToken Result;
EncodingDesc Desc = EncodingDescs[(Int32)E];
Tables[] Ts = Desc.WhichTables;
UInt32 Mask = (1U << Desc.TagBits) - 1;
Result.Table = Ts[Code & Mask];
Result.Index = Code >> Desc.TagBits;
if (Result.Table == Tables.Invalid)
{
throw new BadImageFormatException(Res.InvalidMetadataTokenNilTable);
}
return(Result);
}
UInt32 MetadataTokenSize(Encodings Which)
{
EncodingDesc E = EncodingDescs[(int)Which];
int TagBits = E.TagBits;
UInt32 MaxRows = 0;
foreach (Tables Table in E.WhichTables)
{
if (Table == Tables.Invalid)
{
continue;
}
UInt32 N = NRows[(int)Table];
if (N > MaxRows)
{
MaxRows = N;
}
}
return((MaxRows < (1 << (16 - TagBits))) ? 2U : 4U);
}
