mirror of https://github.com/dahall/Vanara.git
Included RdcStreamReader implementation of IRdcFileReader in base assembly since it is very reusable.
parent
232b0e88cd
commit
912bc9a3cc
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@ -1,4 +1,5 @@
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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Security.Permissions;
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using Vanara.InteropServices;
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@ -667,8 +668,8 @@ namespace Vanara.PInvoke
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/// initialized on return. Callers must release the interface.
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/// </returns>
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/// <remarks>The caller must create a separate signature comparator for each level of recursion.</remarks>
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// https://docs.microsoft.com/en-us/windows/win32/api/msrdc/nf-msrdc-irdclibrary-createcomparator
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// HRESULT CreateComparator( [in] IRdcFileReader *iSeedSignaturesFile, [in] ULONG comparatorBufferSize, [out] IRdcComparator **iComparator );
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// https://docs.microsoft.com/en-us/windows/win32/api/msrdc/nf-msrdc-irdclibrary-createcomparator HRESULT CreateComparator( [in]
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// IRdcFileReader *iSeedSignaturesFile, [in] ULONG comparatorBufferSize, [out] IRdcComparator **iComparator );
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[return: MarshalAs(UnmanagedType.Interface)]
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IRdcComparator CreateComparator([In, MarshalAs(UnmanagedType.Interface)] IRdcFileReader iSeedSignaturesFile, [Optional] uint comparatorBufferSize);
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@ -1595,6 +1596,53 @@ namespace Vanara.PInvoke
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[SecurityPermission(SecurityAction.Demand, UnmanagedCode = true)]
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public class RdcSimilarityGenerator { }
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/// <summary>An implementation of <see cref="IRdcFileReader"/> on top of a <see cref="Stream"/>.</summary>
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/// <seealso cref="IRdcFileReader"/>
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[ComVisible(true), Guid("01EED492-3E92-4DF1-AC94-A7CDD0F23699"), ClassInterface(ClassInterfaceType.None)]
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[SecurityPermission(SecurityAction.Demand, UnmanagedCode = true)]
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public class RdcStreamReader : IRdcFileReader
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{
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private readonly Stream stream;
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/// <summary>Initializes a new instance of the <see cref="RdcStreamReader"/> class with stream to read.</summary>
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/// <param name="stream">The stream to read from.</param>
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public RdcStreamReader(Stream stream) => this.stream = stream;
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private RdcStreamReader() { }
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HRESULT IRdcFileReader.GetFilePosition(out ulong offsetFromStart)
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{
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offsetFromStart = (uint)stream.Position;
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return HRESULT.S_OK;
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}
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HRESULT IRdcFileReader.GetFileSize(out ulong fileSize)
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{
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fileSize = (ulong)stream.Length;
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return HRESULT.S_OK;
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}
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HRESULT IRdcFileReader.Read(ulong offsetFileStart, uint bytesToRead, out uint bytesActuallyRead, byte[] buffer, out bool eof)
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{
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if (stream.Position != (long)offsetFileStart)
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{
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stream.Seek((long)offsetFileStart, SeekOrigin.Begin);
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}
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var intBuff = new byte[bytesToRead];
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int read = 0, lastRead;
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do
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{
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lastRead = stream.Read(intBuff, read, ((int)bytesToRead - read));
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read += lastRead;
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} while (lastRead != 0 && read < bytesToRead);
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bytesActuallyRead = (uint)read;
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Array.Copy(intBuff, buffer, (int)bytesToRead);
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eof = read < bytesToRead;
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return HRESULT.S_OK;
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}
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}
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/// <summary>CLSID_Similarity</summary>
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[ComImport, Guid("96236A91-9DBC-11DA-9E3F-0011114AE311"), ClassInterface(ClassInterfaceType.None)]
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[SecurityPermission(SecurityAction.Demand, UnmanagedCode = true)]
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@ -36,7 +36,7 @@ public class MsRdcTests
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var gParamsCopy = gen.GetGeneratorParameters(MSRDC_MINIMUM_DEPTH);
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Assert.That(gParams.GetSerializeSize(), Is.EqualTo(gParamsCopy.GetSerializeSize()));
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IRdcFileReader reader = new RdcFileReader(File.OpenRead(TestCaseSources.WordDoc));
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IRdcFileReader reader = new RdcStreamReader(File.OpenRead(TestCaseSources.WordDoc));
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//var comp = lib.CreateComparator(reader, maxdepth);
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var sigRead = lib.CreateSignatureReader(reader);
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//TestContext.WriteLine($"SigHdrRes={sigRead.ReadHeader()}");
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@ -53,48 +53,3 @@ public class MsRdcTests
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{
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}
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}
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[ClassInterface(ClassInterfaceType.None)]
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[SecurityPermission(SecurityAction.Demand, UnmanagedCode = true)]
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[ComVisible(true)]
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[Guid("01EED492-3E92-4DF1-AC94-A7CDD0F23699")]
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public class RdcFileReader : IRdcFileReader
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{
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private readonly Stream stream;
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private RdcFileReader() { }
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public RdcFileReader(Stream stream) => this.stream = stream;
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HRESULT IRdcFileReader.GetFileSize(out ulong fileSize)
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{
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fileSize = (ulong)stream.Length;
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return HRESULT.S_OK;
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}
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HRESULT IRdcFileReader.Read(ulong offsetFileStart, uint bytesToRead, out uint bytesActuallyRead, byte[] buffer, out bool eof)
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{
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if (stream.Position != (long)offsetFileStart)
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{
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stream.Seek((long)offsetFileStart, SeekOrigin.Begin);
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}
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var intBuff = new byte[bytesToRead];
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int read = 0, lastRead;
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do
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{
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lastRead = stream.Read(intBuff, read, ((int)bytesToRead - read));
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read += lastRead;
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} while (lastRead != 0 && read < bytesToRead);
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bytesActuallyRead = (uint)read;
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Array.Copy(intBuff, buffer, (int)bytesToRead);
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eof = read < bytesToRead;
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return HRESULT.S_OK;
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}
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HRESULT IRdcFileReader.GetFilePosition(out ulong offsetFromStart)
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{
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offsetFromStart = (uint)stream.Position;
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return HRESULT.S_OK;
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}
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}
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