public void Write(ByteBufferRef buf, int offset)
{
Contract.Assert(offset >= 0 && offset + Size <= buf.Length);
Deserializer.WriteInt(fd, buf, offset);
Deserializer.WriteShort(events, buf, offset + sizeof(int));
Deserializer.WriteShort(revents, buf, offset + sizeof(int) + sizeof(short));
}
internal void WriteInt32(int v)
{
// Fail sliently
if (cursor + sizeof(int) > Buffer.Length)
{
return;
}
var r = new ByteBufferRef(Buffer);
Deserializer.WriteInt(v, r, cursor);
cursor += sizeof(int);
}
private int PrepareBuffer(ByteBufferRef buf, CachePage[] sealed_page)
{
var cursor = 0;
// Metadata
for (var i = 0; i < DataPageOffset; ++i)
{
Deserializer.WriteInt(i, buf, cursor);
cursor += sizeof(int);
}
for (var i = 0; i < sealed_page.Length; ++i)
{
var pgoffset = sealed_page[i].Location;
Deserializer.WriteInt(pgoffset + DataPageOffset, buf, cursor);
cursor += sizeof(int);
if (pgoffset > MaximumPageOffset())
{
Arch.Console.WriteLine("SecureFSINode::FlushAndCloseAsync, file too big");
Utils.Panic();
return(-1);
}
}
var metadata_cursor = cursor;
cursor += DataPageOffset * Arch.ArchDefinition.PageSize;
// Copy data
var sha1 = new SHA1Managed();
for (var i = 0; i < sealed_page.Length; ++i)
{
var page = sealed_page[i];
buf.CopyFrom(cursor, page.Buffer);
sha1.Reset();
sha1.Input(page.Buffer);
var r = sha1.GetResult();
for (var j = 0; j < r.Length; ++j)
{
Signatures[page.Location * HMACSize + j] = r[j];
}
page.Dispose();
cursor += Arch.ArchDefinition.PageSize;
}
SerializeMetadata(buf, metadata_cursor);
return(0);
}
private void SerializeMetadata(ByteBufferRef buf, int cursor)
{
Deserializer.WriteULong(HeaderMagic, buf, cursor);
cursor += sizeof(ulong);
var hmac = CalculateHMAC(DataPageOffset, FileSize, Signatures);
buf.CopyFrom(cursor, hmac);
cursor += HMACSize;
Deserializer.WriteInt(DataPageOffset, buf, cursor);
cursor += sizeof(int);
Deserializer.WriteUInt(FileSize, buf, cursor);
cursor += sizeof(uint);
Deserializer.WriteInt(Signatures.Length, buf, cursor);
cursor += sizeof(int);
buf.CopyFrom(cursor, Signatures);
}
private int AppendPatchTable()
{
// Skip the field storing the number of the patch
PatchTableOffset = WriteCursor + sizeof(int);
if (WriteCursor + (CurrentPatchEntry + 1) * sizeof(int) > buf.Length)
{
return(-1);
}
Deserializer.WriteInt(CurrentPatchEntry, buf, WriteCursor);
WriteCursor += sizeof(int);
for (var i = 0; i < CurrentPatchEntry; i++)
{
Deserializer.WriteInt(patchTable[i], buf, WriteCursor);
WriteCursor += sizeof(int);
}
return(0);
}