102 lines
2.2 KiB
C#
102 lines
2.2 KiB
C#
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// dnlib: See LICENSE.txt for more info
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using dnlib.IO;
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namespace dnlib.DotNet.Pdb.Managed {
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static class NumericReader {
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public static bool TryReadNumeric(ref DataReader reader, ulong end, out object value) {
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value = null;
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ulong position = reader.Position;
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if (position + 2 > end)
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return false;
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var numLeaf = (NumericLeaf)reader.ReadUInt16();
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if (numLeaf < NumericLeaf.LF_NUMERIC) {
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value = (short)numLeaf;
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return true;
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}
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switch (numLeaf) {
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case NumericLeaf.LF_CHAR:
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if (position > end)
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return false;
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value = reader.ReadSByte();
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return true;
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case NumericLeaf.LF_SHORT:
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if (position + 2 > end)
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return false;
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value = reader.ReadInt16();
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return true;
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case NumericLeaf.LF_USHORT:
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if (position + 2 > end)
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return false;
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value = reader.ReadUInt16();
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return true;
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case NumericLeaf.LF_LONG:
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if (position + 4 > end)
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return false;
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value = reader.ReadInt32();
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return true;
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case NumericLeaf.LF_ULONG:
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if (position + 4 > end)
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return false;
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value = reader.ReadUInt32();
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return true;
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case NumericLeaf.LF_REAL32:
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if (position + 4 > end)
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return false;
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value = reader.ReadSingle();
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return true;
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case NumericLeaf.LF_REAL64:
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if (position + 8 > end)
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return false;
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value = reader.ReadDouble();
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return true;
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case NumericLeaf.LF_QUADWORD:
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if (position + 8 > end)
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return false;
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value = reader.ReadInt64();
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return true;
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case NumericLeaf.LF_UQUADWORD:
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if (position + 8 > end)
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return false;
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value = reader.ReadUInt64();
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return true;
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case NumericLeaf.LF_VARSTRING:
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if (position + 2 > end)
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return false;
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int varStrLen = reader.ReadUInt16();
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if (position + (uint)varStrLen > end)
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return false;
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value = reader.ReadUtf8String(varStrLen);
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return true;
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case NumericLeaf.LF_VARIANT:
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if (position + 0x10 > end)
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return false;
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int v0 = reader.ReadInt32();
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int v1 = reader.ReadInt32();
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int v2 = reader.ReadInt32();
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int v3 = reader.ReadInt32();
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byte scale = (byte)(v0 >> 16);
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if (scale <= 28)
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value = new decimal(v2, v3, v1, v0 < 0, scale);
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else
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value = null;
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return true;
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default:
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return false;
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}
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}
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}
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}
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