internal override List<BuilderExtent> FixExtents(out long totalLength)
{
List<BuilderExtent> extents = new List<BuilderExtent>();
MemoryStream descriptorStream = new MemoryStream();
_descriptor.Write(descriptorStream);
// Figure out grain size and number of grain tables, and adjust actual extent size to be a multiple
// of grain size
const int GtesPerGt = 512;
long grainSize = 128;
int numGrainTables = (int)Utilities.Ceil(_content.Length, grainSize * GtesPerGt * Sizes.Sector);
long descriptorLength = 10 * Sizes.OneKiB; // Utilities.RoundUp(descriptorStream.Length, Sizes.Sector);
long descriptorStart = 0;
if (descriptorLength != 0)
{
descriptorStart = 1;
}
long redundantGrainDirStart = Math.Max(descriptorStart, 1) + Utilities.Ceil(descriptorLength, Sizes.Sector);
long redundantGrainDirLength = numGrainTables * 4;
long redundantGrainTablesStart = redundantGrainDirStart + Utilities.Ceil(redundantGrainDirLength, Sizes.Sector);
long redundantGrainTablesLength = numGrainTables * Utilities.RoundUp(GtesPerGt * 4, Sizes.Sector);
long grainDirStart = redundantGrainTablesStart + Utilities.Ceil(redundantGrainTablesLength, Sizes.Sector);
long grainDirLength = numGrainTables * 4;
long grainTablesStart = grainDirStart + Utilities.Ceil(grainDirLength, Sizes.Sector);
long grainTablesLength = numGrainTables * Utilities.RoundUp(GtesPerGt * 4, Sizes.Sector);
long dataStart = Utilities.RoundUp(grainTablesStart + Utilities.Ceil(grainTablesLength, Sizes.Sector), grainSize);
// Generate the header, and write it
HostedSparseExtentHeader header = new HostedSparseExtentHeader();
header.Flags = HostedSparseExtentFlags.ValidLineDetectionTest | HostedSparseExtentFlags.RedundantGrainTable;
header.Capacity = Utilities.RoundUp(_content.Length, grainSize * Sizes.Sector) / Sizes.Sector;
header.GrainSize = grainSize;
header.DescriptorOffset = descriptorStart;
header.DescriptorSize = descriptorLength / Sizes.Sector;
header.NumGTEsPerGT = GtesPerGt;
header.RgdOffset = redundantGrainDirStart;
header.GdOffset = grainDirStart;
header.Overhead = dataStart;
extents.Add(new BuilderBytesExtent(0, header.GetBytes()));
// The descriptor extent
if (descriptorLength > 0)
{
extents.Add(new BuilderStreamExtent(descriptorStart * Sizes.Sector, descriptorStream));
}
// The grain directory extents
extents.Add(new GrainDirectoryExtent(redundantGrainDirStart * Sizes.Sector, redundantGrainTablesStart, numGrainTables, GtesPerGt));
extents.Add(new GrainDirectoryExtent(grainDirStart * Sizes.Sector, grainTablesStart, numGrainTables, GtesPerGt));
// For each graintable span that's present...
long dataSectorsUsed = 0;
long gtSpan = GtesPerGt * grainSize * Sizes.Sector;
foreach (var gtRange in StreamExtent.Blocks(_content.Extents, grainSize * GtesPerGt * Sizes.Sector))
{
for (long i = 0; i < gtRange.Count; ++i)
{
int gt = (int)(gtRange.Offset + i);
SubStream gtStream = new SubStream(_content, gt * gtSpan, Math.Min(gtSpan, _content.Length - (gt * gtSpan)));
GrainTableDataExtent dataExtent = new GrainTableDataExtent((dataStart + dataSectorsUsed) * Sizes.Sector, gtStream, grainSize);
extents.Add(dataExtent);
extents.Add(new GrainTableExtent(GrainTablePosition(redundantGrainTablesStart, gt, GtesPerGt), gtStream, dataStart + dataSectorsUsed, GtesPerGt, grainSize));
extents.Add(new GrainTableExtent(GrainTablePosition(grainTablesStart, gt, GtesPerGt), gtStream, dataStart + dataSectorsUsed, GtesPerGt, grainSize));
dataSectorsUsed += dataExtent.Length / Sizes.Sector;
}
}
totalLength = (dataStart + dataSectorsUsed) * Sizes.Sector;
return extents;
}
internal override List <BuilderExtent> FixExtents(out long totalLength)
{
List <BuilderExtent> extents = new List <BuilderExtent>();
MemoryStream descriptorStream = new MemoryStream();
_descriptor.Write(descriptorStream);
// Figure out grain size and number of grain tables, and adjust actual extent size to be a multiple
// of grain size
const int GtesPerGt = 512;
long grainSize = 128;
int numGrainTables = (int)Utilities.Ceil(_content.Length, grainSize * GtesPerGt * Sizes.Sector);
long descriptorLength = 10 * Sizes.OneKiB; // Utilities.RoundUp(descriptorStream.Length, Sizes.Sector);
long descriptorStart = 0;
if (descriptorLength != 0)
{
descriptorStart = 1;
}
long redundantGrainDirStart = Math.Max(descriptorStart, 1) + Utilities.Ceil(descriptorLength, Sizes.Sector);
long redundantGrainDirLength = numGrainTables * 4;
long redundantGrainTablesStart = redundantGrainDirStart +
Utilities.Ceil(redundantGrainDirLength, Sizes.Sector);
long redundantGrainTablesLength = numGrainTables * Utilities.RoundUp(GtesPerGt * 4, Sizes.Sector);
long grainDirStart = redundantGrainTablesStart + Utilities.Ceil(redundantGrainTablesLength, Sizes.Sector);
long grainDirLength = numGrainTables * 4;
long grainTablesStart = grainDirStart + Utilities.Ceil(grainDirLength, Sizes.Sector);
long grainTablesLength = numGrainTables * Utilities.RoundUp(GtesPerGt * 4, Sizes.Sector);
long dataStart = Utilities.RoundUp(grainTablesStart + Utilities.Ceil(grainTablesLength, Sizes.Sector),
grainSize);
// Generate the header, and write it
HostedSparseExtentHeader header = new HostedSparseExtentHeader();
header.Flags = HostedSparseExtentFlags.ValidLineDetectionTest | HostedSparseExtentFlags.RedundantGrainTable;
header.Capacity = Utilities.RoundUp(_content.Length, grainSize * Sizes.Sector) / Sizes.Sector;
header.GrainSize = grainSize;
header.DescriptorOffset = descriptorStart;
header.DescriptorSize = descriptorLength / Sizes.Sector;
header.NumGTEsPerGT = GtesPerGt;
header.RgdOffset = redundantGrainDirStart;
header.GdOffset = grainDirStart;
header.Overhead = dataStart;
extents.Add(new BuilderBytesExtent(0, header.GetBytes()));
// The descriptor extent
if (descriptorLength > 0)
{
extents.Add(new BuilderStreamExtent(descriptorStart * Sizes.Sector, descriptorStream));
}
// The grain directory extents
extents.Add(new GrainDirectoryExtent(redundantGrainDirStart * Sizes.Sector, redundantGrainTablesStart,
numGrainTables, GtesPerGt));
extents.Add(new GrainDirectoryExtent(grainDirStart * Sizes.Sector, grainTablesStart, numGrainTables, GtesPerGt));
// For each graintable span that's present...
long dataSectorsUsed = 0;
long gtSpan = GtesPerGt * grainSize * Sizes.Sector;
foreach (Range <long, long> gtRange in StreamExtent.Blocks(_content.Extents, grainSize * GtesPerGt * Sizes.Sector))
{
for (long i = 0; i < gtRange.Count; ++i)
{
int gt = (int)(gtRange.Offset + i);
SubStream gtStream = new SubStream(_content, gt * gtSpan,
Math.Min(gtSpan, _content.Length - gt * gtSpan));
GrainTableDataExtent dataExtent =
new GrainTableDataExtent((dataStart + dataSectorsUsed) * Sizes.Sector, gtStream, grainSize);
extents.Add(dataExtent);
extents.Add(new GrainTableExtent(GrainTablePosition(redundantGrainTablesStart, gt, GtesPerGt),
gtStream, dataStart + dataSectorsUsed, GtesPerGt, grainSize));
extents.Add(new GrainTableExtent(GrainTablePosition(grainTablesStart, gt, GtesPerGt), gtStream,
dataStart + dataSectorsUsed, GtesPerGt, grainSize));
dataSectorsUsed += dataExtent.Length / Sizes.Sector;
}
}
totalLength = (dataStart + dataSectorsUsed) * Sizes.Sector;
return(extents);
}
