public static DiskCopyImage ReadFrom(byte[] dataFork)
{
if (null == dataFork)
{
throw new ArgumentNullException(nameof(dataFork));
}
// Based on: https://www.bigmessowires.com/2013/12/16/macintosh-diskcopy-4-2-floppy-image-converter/
// Process header
byte[] header = new byte[HeaderLength];
Array.Copy(dataFork, header, HeaderLength);
if (header[0x52] != 0x01)
{
throw new Exception("The input does not appear to have a DiskCopy 4.2 header. Missing one byte at offset 0x52.");
}
if (header[0x53] != 0x00)
{
throw new Exception("The input does not appear to have a DiskCopy 4.2 header. Missing zero byte at offset 0x53.");
}
int dataLength = ByteListExtensions.ReadInt32(header, DataLengthOffset);
// Extract embedded data
byte[] data = new byte[dataLength];
Array.Copy(dataFork, HeaderLength, data, 0, dataLength);
return(new DiskCopyImage()
{
Header = header,
Data = data,
});
}
public static MacBinaryFile ReadFrom(Stream inputStream)
{
if (null == inputStream)
{
throw new ArgumentNullException(nameof(inputStream));
}
// Based on spec: https://github.com/mietek/theunarchiver/wiki/MacBinarySpecs
using BinaryReader binaryReader = new BinaryReader(inputStream);
byte[] header = binaryReader.ReadBytes(HeaderLength);
if (header[0x00] != 0)
{
throw new Exception("The input does not appear to have a MacBinary header. Missing zero byte at offset 0x00.");
}
int filenameLength = header[FileNameLengthOffset];
if (filenameLength < MinFileNameLength || filenameLength > MaxFileNameLength)
{
throw new Exception("The input does not appear to have a MacBinary header. Filename length is out of range.");
}
string fileName = ByteListExtensions.ReadString(header, FileNameOffset, filenameLength);
string fileType = ByteListExtensions.ReadString(header, FileTypeOffest, FileTypeLength);
string fileCreator = ByteListExtensions.ReadString(header, FileCreatorOffest, FileCreatorLength);
ushort finderFlags = (ushort)((header[FinderFlagsHighOffset] << 8) + header[FinderFlagsLowOffset]);
if (header[0x4A] != 0)
{
throw new Exception("The input does not appear to have a MacBinary header. Missing zero byte at offset 0x4A.");
}
if (header[0x52] != 0)
{
throw new Exception("The input does not appear to have a MacBinary header. Missing zero byte at offset 0x52.");
}
int dataForkLength = ByteListExtensions.ReadInt32(header, DataForkLengthOffset);
if (dataForkLength < MinForkLength || dataForkLength > MaxForkLength)
{
throw new Exception("The input does not appear to have a MacBinary header. Data fork length is out of range.");
}
int resourceForkLength = ByteListExtensions.ReadInt32(header, ResourceForkLengthOffset);
if (resourceForkLength < MinForkLength || resourceForkLength > MaxForkLength)
{
throw new Exception("The input does not appear to have a MacBinary header. Resource fork length is out of range.");
}
byte[] dataFork = dataForkLength > 0 ? binaryReader.ReadBytes(dataForkLength) : new byte[0];
binaryReader.ReadBytes(dataForkLength % 128);
byte[] resourceFork = resourceForkLength > 0 ? binaryReader.ReadBytes(resourceForkLength) : new byte[0];
return(new MacBinaryFile()
{
FileName = fileName,
FileType = fileType,
FileCreator = fileCreator,
FinderFlags = finderFlags,
DataFork = dataFork,
ResourceFork = resourceFork,
});
}