102 lines
3.9 KiB
Plaintext
102 lines
3.9 KiB
Plaintext
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////////////////////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: DirAclCoreSupport.sg
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//
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// Note:
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//
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using System;
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using System.Text;
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using System.Threading;
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using Microsoft.Singularity.Channels;
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using Microsoft.Singularity.Security;
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using Microsoft.Singularity.Directory;
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namespace Microsoft.Singularity.Directory
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{
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public class DirAclCoreSupport : IAclCoreSupport
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{
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private UTF8Encoding! encoder = new UTF8Encoding();
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private TRef<DirectoryServiceContract.Imp:Ready> cachedRootNS = null;
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public string Expand(string! path)
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{
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// read the file size
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if (cachedRootNS == null)
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cachedRootNS = new TRef<DirectoryServiceContract.Imp:Ready>(
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DirectoryService.NewClientEndpoint());
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DirectoryServiceContract.Imp:Ready! ns = cachedRootNS.Acquire();
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byte[] result = ReadFromFile(path, ns);
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cachedRootNS.Release(ns);
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if (result == null)
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return null;
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string! subexpression = (!)encoder.GetString(result);
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return subexpression;
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}
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private byte[] ReadFromFile(string!path, DirectoryServiceContract.Imp:Ready! ns)
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{
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ErrorCode errCode;
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byte[] result;
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long size = 0;
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int readSize = 4096;
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NodeType nodeType;
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try {
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bool temp = SdsUtils.GetAttributes(path, ns, out size, out nodeType, out errCode);
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if (! temp)
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// element does not exist or an error has occurred
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throw new Exception("Cannot get attributes - " + SdsUtils.ErrorCodeToString(errCode));
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result = new byte[size];
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byte[] in ExHeap buf = new[ExHeap] byte[readSize];
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if (result == null || buf == null)
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throw new Exception("Cannot allocate memory");
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FileContract.Imp! fileImp;
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FileContract.Exp! fileExp;
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FileContract.NewChannel(out fileImp, out fileExp);
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bool bindOk = SdsUtils.Bind(path, ns, fileExp, out errCode);
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if (!bindOk) {
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delete fileImp;
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throw new Exception("Can't read group - " + SdsUtils.ErrorCodeToString(errCode));
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}
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fileImp.RecvSuccess();
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long readOffset = 0;
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while (true) {
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fileImp.SendRead(buf, 0, readOffset, readSize);
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switch receive {
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case fileImp.AckRead(localbuf, bytesRead, error) :
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// move the memory
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Bitter.ToByteArray(localbuf, 0, (int)bytesRead, result, (int)readOffset);
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if (bytesRead == readSize) {
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// see if there is more
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readOffset += bytesRead;
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buf = localbuf;
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continue;
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}
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delete localbuf;
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break;
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case fileImp.ChannelClosed() :
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break;
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case unsatisfiable :
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break;
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}
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break;
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}
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delete fileImp;
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} catch (Exception e) {
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DebugStub.Print("An exception occurred while reading group definition: {0}\n",
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__arglist(path));
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DebugStub.Print("Message: {0}\n", __arglist(e.Message));
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return null;
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}
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return result;
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}
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}
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}
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