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103 lines
3.7 KiB
C#
103 lines
3.7 KiB
C#
using System;
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using LessIO;
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using System.Runtime.InteropServices;
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namespace LibMSPackN
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{
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/// <summary>
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/// Represents a file contained inside of a cab. Returned from <see cref="MSCabinet.GetFiles()"/>.
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/// </summary>
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public sealed class MSCompressedFile
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{
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private readonly MSCabinet _parentCabinet;
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private readonly NativeMethods.mscabd_file _nativeFile;
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private readonly IntPtr _pNativeFile;
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internal MSCompressedFile(MSCabinet parentCabinet, IntPtr pNativeFile)
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{
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//NOTE: we don't need to explicitly clean the nativeFile up. It is cleaned up by the parent cabinet.
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_parentCabinet = parentCabinet;
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_pNativeFile = pNativeFile;
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_nativeFile = (NativeMethods.mscabd_file)Marshal.PtrToStructure(_pNativeFile, typeof (NativeMethods.mscabd_file));
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}
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private void ThrowOnInvalidState()
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{
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if (_parentCabinet.IsInvalidState)
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throw new InvalidOperationException("Parent cabinet is no longer in a valid state. Ensure it was not disposed.");
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if (_pNativeFile == IntPtr.Zero)
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throw new InvalidOperationException("Native file is not initialized.");
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}
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public string Filename
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{
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get
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{
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ThrowOnInvalidState();
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return _nativeFile.filename;
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}
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}
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public uint LengthInBytes
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{
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get
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{
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ThrowOnInvalidState();
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return _nativeFile.length;
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}
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}
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public MSCompressedFile Next
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{
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get
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{
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MSCompressedFile next;
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if (_nativeFile.next != IntPtr.Zero)
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next = new MSCompressedFile(_parentCabinet, _nativeFile.next);
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else
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next = null;
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return next;
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}
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}
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public void ExtractTo(string destinationFilename)
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{
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ThrowOnInvalidState();
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IntPtr pDestinationFilename = IntPtr.Zero;
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//TODO: Delete the file if it exists. If there are any issues ovewriting the dest file (e.g. it's readonly) MSPACK gives essentialy no error information.
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string longDestinationFilename = new Path(destinationFilename).WithWin32LongPathPrefix();
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try
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{
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pDestinationFilename = Marshal.StringToCoTaskMemAnsi(longDestinationFilename);
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var result = NativeMethods.mspack_invoke_mscab_decompressor_extract(_parentCabinet.Decompressor, _pNativeFile, pDestinationFilename);
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if (result != NativeMethods.MSPACK_ERR.MSPACK_ERR_OK)
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throw new Exception(string.Format("Error '{0}' extracting file to {1}.", result, longDestinationFilename));
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FileSystem.SetLastWriteTime(new LessIO.Path(longDestinationFilename), GetModifiedTime());
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var theAttributes = FileSystem.GetAttributes(new LessIO.Path(longDestinationFilename));
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if ((_nativeFile.attribs & NativeMethods.mscabd_file_attribs.MSCAB_ATTRIB_ARCH) == NativeMethods.mscabd_file_attribs.MSCAB_ATTRIB_ARCH)
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theAttributes |= FileAttributes.Archive;
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if ((_nativeFile.attribs & NativeMethods.mscabd_file_attribs.MSCAB_ATTRIB_HIDDEN) == NativeMethods.mscabd_file_attribs.MSCAB_ATTRIB_HIDDEN)
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theAttributes |= FileAttributes.Hidden;
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if ((_nativeFile.attribs & NativeMethods.mscabd_file_attribs.MSCAB_ATTRIB_RDONLY) == NativeMethods.mscabd_file_attribs.MSCAB_ATTRIB_RDONLY)
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theAttributes |= FileAttributes.ReadOnly;
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if ((_nativeFile.attribs & NativeMethods.mscabd_file_attribs.MSCAB_ATTRIB_SYSTEM) == NativeMethods.mscabd_file_attribs.MSCAB_ATTRIB_SYSTEM)
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theAttributes |= FileAttributes.System;
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FileSystem.SetAttributes(new LessIO.Path(longDestinationFilename), theAttributes);
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}
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finally
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{
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if (pDestinationFilename != IntPtr.Zero)
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Marshal.FreeCoTaskMem(pDestinationFilename);
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}
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}
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private DateTime GetModifiedTime()
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{
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return new DateTime(_nativeFile.date_y, _nativeFile.date_m, _nativeFile.date_d, _nativeFile.time_h, _nativeFile.time_m, _nativeFile.time_s);
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}
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}
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} |