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ahmed
2025-09-04 19:13:14 +03:00
parent 47c3f9f926
commit a2a7ff445c
14 changed files with 603 additions and 524 deletions
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123
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 static (ulong, 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 (1, new ParsedTDU()
{
Identifier = (TDUIdentifier)h,
Data = data,
Offset = offset,
Class = cls,
Exponent = (byte)exp,
Index = (byte)h & 0x7,
ContentLength = 0,
TotalLength = 1,
});
ulong cl = (ulong)(1 << (exp - 1));
if (ends - offset < cl)
return (cl - (ends - offset), null);
//offset += (uint)cl;
return (1 + cl, new ParsedTDU()
{
Identifier = (TDUIdentifier)h,
Data = data,
Offset = offset,
Class = cls,
ContentLength = cl,
TotalLength = 1 + cl,
Exponent = (byte)exp,
Index = (byte)h & 0x7,
});
}
else if (cls == TDUClass.Typed)
{
ulong cll = (ulong)(h >> 3) & 0x7;
if (ends - offset < cll)
return (cll - (ends - offset), null);
ulong cl = 0;
for (uint i = 0; i < cll; i++)
cl = cl << 8 | data[offset++];
if (ends - offset < cl)
return (cl - (ends - offset), null);
var metaData = DC.Clip(data, offset + 1, data[offset]);
offset += data[offset];
return (1 + cl + cll, new ParsedTDU()
{
Identifier = (TDUIdentifier)(h & 0xC7),
Data = data,
Offset = offset,
Class = cls,
ContentLength = cl,
TotalLength = 1 + cl + cll,
Index = (byte)h & 0x7,
Metadata = metaData,
});
}
else
{
ulong cll = (ulong)(h >> 3) & 0x7;
if (ends - offset < cll)
return (cll - (ends - offset), null);
ulong cl = 0;
for (uint i = 0; i < cll; i++)
cl = cl << 8 | data[offset++];
if (ends - offset < cl)
return (cl - (ends - offset), null);
return (1 + cl + cll,
new ParsedTDU()
{
Identifier = (TDUIdentifier)(h & 0xC7),
Data = data,
Offset = offset,
Class = cls,
ContentLength = cl,
TotalLength = 1 + cl + cll,
Index = (byte)h & 0x7
});
}
}
}
}