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Implements verification on all currently supported disk

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images.
	Implements DC42 CRC calculation.
	Calculates TeleDisk CRC for disk sectors.
	Resolves #2 and bumps version to 2.1.
This commit is contained in:
Natalia Portillo
2014-08-25 05:00:25 +01:00
parent fd60149c37
commit 3a03e3121e
13 changed files with 721 additions and 107 deletions
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96
DiscImageChef/ImagePlugins/DiskCopy42.cs
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@@ -373,6 +373,83 @@ namespace DiscImageChef.ImagePlugins
return true;
}
public override bool? VerifySector(UInt64 sectorAddress)
{
return null;
}
public override bool? VerifySector(UInt64 sectorAddress, UInt32 track)
{
return null;
}
public override bool? VerifySectors(UInt64 sectorAddress, UInt32 length, out List<UInt64> FailingLBAs, out List<UInt64> UnknownLBAs)
{
FailingLBAs = new List<UInt64>();
UnknownLBAs = new List<UInt64>();
for (UInt64 i = sectorAddress; i < sectorAddress + length; i++)
UnknownLBAs.Add(i);
return null;
}
public override bool? VerifySectors(UInt64 sectorAddress, UInt32 length, UInt32 track, out List<UInt64> FailingLBAs, out List<UInt64> UnknownLBAs)
{
FailingLBAs = new List<UInt64>();
UnknownLBAs = new List<UInt64>();
for (UInt64 i = sectorAddress; i < sectorAddress + length; i++)
UnknownLBAs.Add(i);
return null;
}
public override bool? VerifyDiskImage()
{
byte[] data = new byte[header.dataSize];
byte[] tags = new byte[header.tagSize];
UInt32 dataChk;
UInt32 tagsChk = 0;
if (MainClass.isDebug)
Console.WriteLine("DEBUG (DC42 plugin): Reading data");
FileStream datastream = new FileStream(dc42ImagePath, FileMode.Open, FileAccess.Read);
datastream.Seek((long)(dataOffset), SeekOrigin.Begin);
datastream.Read(data, 0, (int)header.dataSize);
datastream.Close();
if (MainClass.isDebug)
Console.WriteLine("DEBUG (DC42 plugin): Calculating data checksum");
dataChk = DC42CheckSum(data);
if (MainClass.isDebug)
{
Console.WriteLine("DEBUG (DC42 plugin): Calculated data checksum = 0x{0:X8}", dataChk);
Console.WriteLine("DEBUG (DC42 plugin): Stored data checksum = 0x{0:X8}", header.dataChecksum);
}
if (header.tagSize > 0)
{
if (MainClass.isDebug)
Console.WriteLine("DEBUG (DC42 plugin): Reading tags");
FileStream tagstream = new FileStream(dc42ImagePath, FileMode.Open, FileAccess.Read);
tagstream.Seek((long)(tagOffset), SeekOrigin.Begin);
tagstream.Read(tags, 0, (int)header.tagSize);
tagstream.Close();
if (MainClass.isDebug)
Console.WriteLine("DEBUG (DC42 plugin): Calculating data checksum");
tagsChk = DC42CheckSum(data);
if (MainClass.isDebug)
{
Console.WriteLine("DEBUG (DC42 plugin): Calculated data checksum = 0x{0:X8}", tagsChk);
Console.WriteLine("DEBUG (DC42 plugin): Stored data checksum = 0x{0:X8}", header.tagChecksum);
}
}
return dataChk == header.dataChecksum && tagsChk == header.tagChecksum;
}
public override bool ImageHasPartitions()
{
return _imageInfo.imageHasPartitions;
@@ -640,6 +717,25 @@ namespace DiscImageChef.ImagePlugins
}
#endregion Unsupported features
#region Private methods
private static UInt32 DC42CheckSum(byte[] buffer)
{
UInt32 dc42chk = 0;
if ((buffer.Length & 0x01) == 0x01)
return 0xFFFFFFFF;
for (UInt32 i = 0; i < buffer.Length; i += 2)
{
dc42chk += (uint)(buffer[i] << 8);
dc42chk += buffer[i + 1];
dc42chk = (dc42chk >> 1) | (dc42chk << 31);
}
return dc42chk;
}
#endregion
}
}