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Start to implement OpenImage(), decode comment block.

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Natalia Portillo
2014-04-21 20:27:50 +01:00
parent b9e78615e2
commit 4a35b934e5
2 changed files with 140 additions and 1 deletions
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5
FileSystemIDandChk/ChangeLog
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@@ -1,3 +1,8 @@
2014-04-21 Natalia Portillo <claunia@claunia.com>
* ImagePlugins/TeleDisk.cs:
Start to implement OpenImage(), decode comment block.
2014-04-21 Natalia Portillo <claunia@claunia.com>
* ImagePlugins/TeleDisk.cs:

136
FileSystemIDandChk/ImagePlugins/TeleDisk.cs
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@@ -191,6 +191,8 @@ namespace FileSystemIDandChk.ImagePlugins
TDCommentBlockHeader commentHeader;
byte[] commentBlock;
string comment;
DateTime creationDate;
DateTime modificationDate;
#endregion
@@ -264,7 +266,139 @@ namespace FileSystemIDandChk.ImagePlugins
public override bool OpenImage(string imagePath)
{
throw new NotImplementedException("Not yet implemented.");
header = new TD0Header();
byte[] headerBytes = new byte[12];
FileStream stream = new FileStream(imagePath, FileMode.Open, FileAccess.Read);
stream.Read(headerBytes, 0, 12);
header.signature = BitConverter.ToUInt16(headerBytes, 0);
if (header.signature != tdMagic && header.signature != tdAdvCompMagic)
return false;
header.sequence = headerBytes[2];
header.diskSet = headerBytes[3];
header.version = headerBytes[4];
header.dataRate = headerBytes[5];
header.driveType = headerBytes[6];
header.stepping = headerBytes[7];
header.dosAllocation = headerBytes[8];
header.sides = headerBytes[9];
header.crc = BitConverter.ToUInt16(headerBytes, 10);
byte[] headerBytesForCRC = new byte[10];
Array.Copy(headerBytes, headerBytesForCRC, 10);
UInt16 calculatedHeaderCRC = TeleDiskCRC(0x0000, headerBytesForCRC);
if (MainClass.isDebug)
{
Console.WriteLine("DEBUG (TeleDisk plugin): header.signature = 0x{0:X4}", header.signature);
Console.WriteLine("DEBUG (TeleDisk plugin): header.sequence = 0x{0:X2}", header.sequence);
Console.WriteLine("DEBUG (TeleDisk plugin): header.diskSet = 0x{0:X2}", header.diskSet);
Console.WriteLine("DEBUG (TeleDisk plugin): header.version = 0x{0:X2}", header.version);
Console.WriteLine("DEBUG (TeleDisk plugin): header.dataRate = 0x{0:X2}", header.dataRate);
Console.WriteLine("DEBUG (TeleDisk plugin): header.driveType = 0x{0:X2}", header.driveType);
Console.WriteLine("DEBUG (TeleDisk plugin): header.stepping = 0x{0:X2}", header.stepping);
Console.WriteLine("DEBUG (TeleDisk plugin): header.dosAllocation = 0x{0:X2}", header.dosAllocation);
Console.WriteLine("DEBUG (TeleDisk plugin): header.sides = 0x{0:X2}", header.sides);
Console.WriteLine("DEBUG (TeleDisk plugin): header.crc = 0x{0:X4}", header.crc);
Console.WriteLine("DEBUG (TeleDisk plugin): calculated header crc = 0x{0:X4}", calculatedHeaderCRC);
}
// We need more checks as the magic is too simply.
// This may deny legal images
// That would be much of a coincidence
if (header.crc != calculatedHeaderCRC && MainClass.isDebug)
Console.WriteLine("DEBUG (TeleDisk plugin): Calculated CRC does not coincide with stored one.");
if (header.sequence != 0x00)
return false;
if (header.dataRate != DataRate250kbps && header.dataRate != DataRate300kbps && header.dataRate != DataRate500kbps)
return false;
if (header.driveType != DriveType35DD && header.driveType != DriveType35ED && header.driveType != DriveType35HD && header.driveType != DriveType525DD &&
header.driveType != DriveType525HD && header.driveType != DriveType525HD_DDDisk && header.driveType != DriveType8inch)
return false;
if (header.signature == tdAdvCompMagic)
throw new NotImplementedException("TeleDisk Advanced Compression support not yet implemented");
creationDate = DateTime.MinValue;
if ((header.stepping & CommentBlockPresent) == CommentBlockPresent)
{
commentHeader = new TDCommentBlockHeader();
byte[] commentHeaderBytes = new byte[10];
byte[] commentBlockForCRC;
stream.Read(commentHeaderBytes, 0, 10);
commentHeader.crc = BitConverter.ToUInt16(commentHeaderBytes, 0);
commentHeader.length = BitConverter.ToUInt16(commentHeaderBytes, 2);
commentHeader.year = commentHeaderBytes[4];
commentHeader.month = commentHeaderBytes[5];
commentHeader.day = commentHeaderBytes[6];
commentHeader.hour = commentHeaderBytes[7];
commentHeader.minute = commentHeaderBytes[8];
commentHeader.second = commentHeaderBytes[9];
commentBlock = new byte[commentHeader.length];
stream.Read(commentBlock, 0, commentHeader.length);
commentBlockForCRC = new byte[commentHeader.length + 8];
Array.Copy(commentHeaderBytes, 2, commentBlockForCRC, 0, 8);
Array.Copy(commentBlock, 0, commentBlockForCRC, 8, commentHeader.length);
UInt16 cmtcrc = TeleDiskCRC(0, commentBlockForCRC);
if(MainClass.isDebug)
{
Console.WriteLine("DEBUG (TeleDisk plugin): Comment header");
Console.WriteLine("DEBUG (TeleDisk plugin): \tcommentheader.crc = 0x{0:X4}", commentHeader.crc);
Console.WriteLine("DEBUG (TeleDisk plugin): \tCalculated CRC = 0x{0:X4}", cmtcrc);
Console.WriteLine("DEBUG (TeleDisk plugin): \tcommentheader.length = {0} bytes", commentHeader.length);
Console.WriteLine("DEBUG (TeleDisk plugin): \tcommentheader.year = {0}", commentHeader.year);
Console.WriteLine("DEBUG (TeleDisk plugin): \tcommentheader.month = {0}", commentHeader.month);
Console.WriteLine("DEBUG (TeleDisk plugin): \tcommentheader.day = {0}", commentHeader.day);
Console.WriteLine("DEBUG (TeleDisk plugin): \tcommentheader.hour = {0}", commentHeader.hour);
Console.WriteLine("DEBUG (TeleDisk plugin): \tcommentheader.minute = {0}", commentHeader.minute);
Console.WriteLine("DEBUG (TeleDisk plugin): \tcommentheader.second = {0}", commentHeader.second);
}
for(int i=0;i<commentBlock.Length;i++)
{
// Replace NULLs, used by TeleDisk as newline markers, with UNIX newline marker
if(commentBlock[i]==0x00)
commentBlock[i]=0x0A;
}
comment = System.Text.Encoding.ASCII.GetString(commentBlock);
if(MainClass.isDebug)
{
Console.WriteLine("DEBUG (TeleDisk plugin): Comment");
Console.WriteLine("DEBUG (TeleDisk plugin): {0}", comment);
}
creationDate = new DateTime(commentHeader.year+1900, commentHeader.month+1, commentHeader.day,
commentHeader.hour, commentHeader.minute, commentHeader.second, DateTimeKind.Unspecified);
}
FileInfo fi = new FileInfo(imagePath);
if (creationDate == DateTime.MinValue)
creationDate = fi.CreationTimeUtc;
modificationDate = fi.LastWriteTimeUtc;
if (MainClass.isDebug)
{
Console.WriteLine("DEBUG (TeleDisk plugin): Image created on {0}", creationDate);
Console.WriteLine("DEBUG (TeleDisk plugin): Image modified on {0}", modificationDate);
}
return false;
}
public override bool ImageHasPartitions()