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Add option to generate subchannels for undumped ones.

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This commit is contained in:
Natalia Portillo
2020-07-13 22:32:40 +01:00
parent 5227412e69
commit 55e420a423
2 changed files with 94 additions and 11 deletions
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80
CD/Subchannel.cs
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@@ -1,3 +1,4 @@
using System;
using Aaru.Checksums;
namespace Aaru.Decoders.CD
@@ -482,5 +483,84 @@ namespace Aaru.Decoders.CD
default: return 0x00;
}
}
public static byte[] Generate(int sector, uint trackSequence, int pregap, int trackStart, byte flags,
byte index)
{
bool isPregap = sector < 0 || sector <= trackStart + pregap;
if(index == 0)
index = (byte)(isPregap ? 0 : 1);
byte[] sub = new byte[96];
// P
if(isPregap)
{
sub[0] = 0xFF;
sub[1] = 0xFF;
sub[2] = 0xFF;
sub[3] = 0xFF;
sub[4] = 0xFF;
sub[5] = 0xFF;
sub[6] = 0xFF;
sub[7] = 0xFF;
sub[8] = 0xFF;
sub[9] = 0xFF;
sub[10] = 0xFF;
sub[11] = 0xFF;
}
// Q
byte[] q = new byte[12];
q[0] = (byte)((flags << 4) + 1);
q[1] = (byte)trackSequence;
q[2] = index;
int relative;
if(isPregap)
relative = (pregap + trackStart) - sector;
else
relative = sector - trackStart;
sector += 150;
int min = relative / 60 / 75;
int sec = (relative / 75) - (min * 60);
int frame = relative - (min * 60 * 75) - (sec * 75);
int amin = sector / 60 / 75;
int asec = (sector / 75) - (amin * 60);
int aframe = sector - (amin * 60 * 75) - (asec * 75);
q[3] = (byte)min;
q[4] = (byte)sec;
q[5] = (byte)frame;
q[7] = (byte)amin;
q[8] = (byte)asec;
q[9] = (byte)aframe;
q[1] = (byte)(((q[1] / 10) << 4) + (q[1] % 10));
q[2] = (byte)(((q[2] / 10) << 4) + (q[2] % 10));
q[3] = (byte)(((q[3] / 10) << 4) + (q[3] % 10));
q[4] = (byte)(((q[4] / 10) << 4) + (q[4] % 10));
q[5] = (byte)(((q[5] / 10) << 4) + (q[5] % 10));
q[6] = (byte)(((q[6] / 10) << 4) + (q[6] % 10));
q[7] = (byte)(((q[7] / 10) << 4) + (q[7] % 10));
q[8] = (byte)(((q[8] / 10) << 4) + (q[8] % 10));
q[9] = (byte)(((q[9] / 10) << 4) + (q[9] % 10));
CRC16CCITTContext.Data(q, 10, out byte[] qCrc);
q[10] = qCrc[0];
q[11] = qCrc[1];
Array.Copy(q, 0, sub, 12, 12);
return Interleave(sub);
}
}
}