/// <summary>
/// Decodes a sector tag. Not tested with 24-byte tags.
/// </summary>
/// <returns>Error number.</returns>
/// <param name="tag">Sector tag.</param>
/// <param name="decoded">Decoded sector tag.</param>
static Errno DecodeTag(byte[] tag, out LisaTag.PriamTag decoded)
{
decoded = new LisaTag.PriamTag();
LisaTag.PriamTag?pmTag = LisaTag.DecodeTag(tag);
if (!pmTag.HasValue)
{
return(Errno.InvalidArgument);
}
decoded = pmTag.Value;
return(Errno.NoError);
}
public bool WriteSectorsLong(byte[] data, ulong sectorAddress, uint length)
{
if (!IsWriting)
{
ErrorMessage = "Tried to write on a non-writable image";
return(false);
}
if (sectorAddress + length > imageInfo.Sectors)
{
ErrorMessage = "Tried to write past image size";
return(false);
}
int longSectorSize = imageInfo.MediaType == MediaType.PriamDataTower ? 536 : 532;
long givenSectorSize = data.Length / length;
switch (givenSectorSize)
{
case 536:
case 532:
case 524:
case 512: break;
default:
ErrorMessage = "Incorrect data size";
return(false);
}
for (uint i = 0; i < length; i++)
{
byte[] oldTag;
byte[] newTag;
switch (givenSectorSize - 512)
{
// Sony tag, convert to Profile
case 12 when longSectorSize == 532:
oldTag = new byte[12];
Array.Copy(data, givenSectorSize * i + 512, oldTag, 0, 12);
newTag = LisaTag.DecodeSonyTag(oldTag)?.ToProfile().GetBytes();
break;
// Sony tag, convert to Priam
case 12 when longSectorSize == 536:
oldTag = new byte[12];
Array.Copy(data, givenSectorSize * i + 512, oldTag, 0, 12);
newTag = LisaTag.DecodeSonyTag(oldTag)?.ToPriam().GetBytes();
break;
// Profile tag, copy to Profile
case 20 when longSectorSize == 532:
newTag = new byte[20];
Array.Copy(data, givenSectorSize * i + 512, newTag, 0, 20);
break;
// Profile tag, convert to Priam
case 20 when longSectorSize == 536:
oldTag = new byte[20];
Array.Copy(data, givenSectorSize * i + 512, oldTag, 0, 20);
newTag = LisaTag.DecodeProfileTag(oldTag)?.ToPriam().GetBytes();
break;
// Priam tag, convert to Profile
case 24 when longSectorSize == 532:
oldTag = new byte[24];
Array.Copy(data, givenSectorSize * i + 512, oldTag, 0, 24);
newTag = LisaTag.DecodePriamTag(oldTag)?.ToProfile().GetBytes();
break;
// Priam tag, copy to Priam
case 12 when longSectorSize == 536:
newTag = new byte[24];
Array.Copy(data, givenSectorSize * i + 512, newTag, 0, 24);
break;
case 0:
newTag = null;
break;
default:
ErrorMessage = "Incorrect data size";
return(false);
}
if (newTag == null)
{
newTag = new byte[longSectorSize - 512];
}
writingStream.Seek(longSectorSize + (long)sectorAddress * longSectorSize, SeekOrigin.Begin);
writingStream.Write(data, (int)(givenSectorSize * i), 512);
writingStream.Write(newTag, 0, newTag.Length);
}
ErrorMessage = "";
return(true);
}
public bool WriteSectorLong(byte[] data, ulong sectorAddress)
{
if (!IsWriting)
{
ErrorMessage = "Tried to write on a non-writable image";
return(false);
}
if (sectorAddress >= _imageInfo.Sectors)
{
ErrorMessage = "Tried to write past image size";
return(false);
}
int longSectorSize = _imageInfo.MediaType == MediaType.PriamDataTower ? 536 : 532;
byte[] oldTag;
byte[] newTag;
switch (data.Length - 512)
{
// Sony tag, convert to Profile
case 12 when longSectorSize == 532:
oldTag = new byte[12];
Array.Copy(data, 512, oldTag, 0, 12);
newTag = LisaTag.DecodeSonyTag(oldTag)?.ToProfile().GetBytes();
break;
// Sony tag, convert to Priam
case 12:
oldTag = new byte[12];
Array.Copy(data, 512, oldTag, 0, 12);
newTag = LisaTag.DecodeSonyTag(oldTag)?.ToPriam().GetBytes();
break;
// Profile tag, copy to Profile
case 20 when longSectorSize == 532:
newTag = new byte[20];
Array.Copy(data, 512, newTag, 0, 20);
break;
// Profile tag, convert to Priam
case 20:
oldTag = new byte[20];
Array.Copy(data, 512, oldTag, 0, 20);
newTag = LisaTag.DecodeProfileTag(oldTag)?.ToPriam().GetBytes();
break;
// Priam tag, convert to Profile
case 24 when longSectorSize == 532:
oldTag = new byte[24];
Array.Copy(data, 512, oldTag, 0, 24);
newTag = LisaTag.DecodePriamTag(oldTag)?.ToProfile().GetBytes();
break;
// Priam tag, copy to Priam
case 24:
newTag = new byte[24];
Array.Copy(data, 512, newTag, 0, 24);
break;
case 0:
newTag = null;
break;
default:
ErrorMessage = "Incorrect data size";
return(false);
}
newTag ??= new byte[longSectorSize - 512];
_writingStream.Seek(longSectorSize + ((long)sectorAddress * longSectorSize), SeekOrigin.Begin);
_writingStream.Write(data, 0, 512);
_writingStream.Write(newTag, 0, newTag.Length);
ErrorMessage = "";
return(true);
}
