} // Size of DMG when expanded, in sectors
private DmgHeader(
uint version,
uint flags,
ulong runningDataForkOffset,
ulong dataForkOffset,
ulong dataForkLength,
ulong rsrcForkOffset,
ulong rsrcForkLength,
uint segmentNumber,
uint segmentCount,
IReadOnlyList <byte> segmentID,
UdifChecksum dataChecksum,
ulong xMLOffset,
ulong xMLLength,
UdifChecksum checksum,
uint imageVariant,
ulong sectorCount)
{
Version = version;
Flags = flags;
RunningDataForkOffset = runningDataForkOffset;
DataForkOffset = dataForkOffset;
DataForkLength = dataForkLength;
RsrcForkOffset = rsrcForkOffset;
RsrcForkLength = rsrcForkLength;
SegmentNumber = segmentNumber;
SegmentCount = segmentCount;
SegmentID = segmentID;
DataChecksum = dataChecksum;
XMLOffset = xMLOffset;
XMLLength = xMLLength;
Checksum = checksum;
ImageVariant = imageVariant;
SectorCount = sectorCount;
}
private BlkxTable(
uint version,
ulong sectorNumber,
ulong sectorCount,
ulong dataOffset,
uint buffersNeeded,
uint blockDescriptors,
UdifChecksum checksum,
IReadOnlyList <BlkxChunk> chunks)
{
Version = version;
SectorNumber = sectorNumber;
SectorCount = sectorCount;
DataOffset = dataOffset;
BuffersNeeded = buffersNeeded;
BlockDescriptors = blockDescriptors;
Checksum = checksum;
Chunks = chunks;
}
internal static bool TryRead(Stream input, out DmgHeader?header)
{
header = null;
var buffer = new byte[HeaderSize];
int count = input.Read(buffer, 0, HeaderSize);
if (count != HeaderSize)
{
return(false);
}
ReadOnlySpan <byte> data = buffer.AsSpan();
uint sig = ReadUInt32(ref data);
if (sig != Signature)
{
return(false);
}
uint version = ReadUInt32(ref data);
uint size = ReadUInt32(ref data);
if (size != (uint)HeaderSize)
{
return(false);
}
uint flags = ReadUInt32(ref data);
ulong runningDataForkOffset = ReadUInt64(ref data);
ulong dataForkOffset = ReadUInt64(ref data);
ulong dataForkLength = ReadUInt64(ref data);
ulong rsrcForkOffset = ReadUInt64(ref data);
ulong rsrcForkLength = ReadUInt64(ref data);
uint segmentNumber = ReadUInt32(ref data);
uint segmentCount = ReadUInt32(ref data);
var segmentID = new byte[UuidSize];
ReadUuid(ref data, segmentID);
var dataChecksum = UdifChecksum.Read(ref data);
ulong xmlOffset = ReadUInt64(ref data);
ulong xmlLength = ReadUInt64(ref data);
data = data.Slice(120); // Reserved bytes
var checksum = UdifChecksum.Read(ref data);
uint imageVariant = ReadUInt32(ref data);
ulong sectorCount = ReadUInt64(ref data);
header = new DmgHeader(
version,
flags,
runningDataForkOffset,
dataForkOffset,
dataForkLength,
rsrcForkOffset,
rsrcForkLength,
segmentNumber,
segmentCount,
segmentID,
dataChecksum,
xmlOffset,
xmlLength,
checksum,
imageVariant,
sectorCount);
return(true);
}
