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ahmed
2026-04-04 04:31:30 +03:00
parent 1339604bc5
commit 5f73cf7af7
298 changed files with 100 additions and 501 deletions
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149
Libraries/Esiur/Data/ParsedTdu.cs Normal file
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using System;
using System.Collections.Generic;
using System.Text;
namespace Esiur.Data
{
public struct ParsedTdu
{
public TduIdentifier Identifier;
public int Index;
public TduClass Class;
public uint Offset;
public ulong ContentLength;
public byte[] Data;
public byte Exponent;
public ulong TotalLength;
public byte[] Metadata;
public uint Ends;
public static ParsedTdu Parse(byte[] data, uint offset, uint ends)
{
var h = data[offset++];
var cls = (TduClass)(h >> 6);
if (cls == TduClass.Fixed)
{
var exp = (h & 0x38) >> 3;
if (exp == 0)
return new ParsedTdu()
{
Identifier = (TduIdentifier)h,
Data = data,
Offset = offset,
Class = cls,
Exponent = (byte)exp,
Index = (byte)h & 0x7,
ContentLength = 0,
TotalLength = 1,
Ends = ends
};
ulong cl = (ulong)(1 << (exp - 1));
if (ends - offset < cl)
return new ParsedTdu()
{
Class = TduClass.Invalid,
TotalLength = (cl - (ends - offset))
};
//offset += (uint)cl;
return new ParsedTdu()
{
Identifier = (TduIdentifier)h,
Data = data,
Offset = offset,
Class = cls,
ContentLength = cl,
TotalLength = 1 + cl,
Exponent = (byte)exp,
Index = (byte)h & 0x7,
Ends = ends
};
}
else if (cls == TduClass.Typed)
{
ulong cll = (ulong)(h >> 3) & 0x7;
if (ends - offset < cll)
return new ParsedTdu()
{
Class = TduClass.Invalid,
TotalLength = (cll - (ends - offset))
};
ulong cl = 0;
for (uint i = 0; i < cll; i++)
cl = cl << 8 | data[offset++];
if (ends - offset < cl)
return new ParsedTdu()
{
TotalLength = (cl - (ends - offset)),
Class = TduClass.Invalid,
};
var metaData = DC.Clip(data, offset + 1, data[offset]);
offset += data[offset] + (uint)1;
return new ParsedTdu()
{
Identifier = (TduIdentifier)(h & 0xC7),
Data = data,
Offset = offset,
Class = cls,
ContentLength = cl - 1 - (uint)metaData.Length,
TotalLength = 1 + cl + cll,
Index = (byte)h & 0x7,
Metadata = metaData,
Ends = ends
};
}
else
{
ulong cll = (ulong)(h >> 3) & 0x7;
if (ends - offset < cll)
return new ParsedTdu()
{
Class = TduClass.Invalid,
TotalLength = (cll - (ends - offset))
};
ulong cl = 0;
for (uint i = 0; i < cll; i++)
cl = cl << 8 | data[offset++];
if (ends - offset < cl)
return new ParsedTdu()
{
Class = TduClass.Invalid,
TotalLength = (cl - (ends - offset))
};
return
new ParsedTdu()
{
Identifier = (TduIdentifier)(h & 0xC7),
Data = data,
Offset = offset,
Class = cls,
ContentLength = cl,
TotalLength = 1 + cl + cll,
Index = (byte)h & 0x7,
Ends = ends
};
}
}
}
}