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Use MemoryMarshal on VirtualBox disk images.

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This commit is contained in:
Natalia Portillo
2019-03-15 01:21:05 +00:00
parent 6d629bacd0
commit b7e98859b0
2 changed files with 11 additions and 6 deletions
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12
DiscImageChef.DiscImages/VDI/Read.cs
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@@ -33,12 +33,13 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using DiscImageChef.CommonTypes;
using DiscImageChef.CommonTypes.Enums;
using DiscImageChef.CommonTypes.Exceptions;
using DiscImageChef.CommonTypes.Interfaces;
using DiscImageChef.Console;
using DiscImageChef.Helpers;
using Marshal = DiscImageChef.Helpers.Marshal;
namespace DiscImageChef.DiscImages
{
@@ -83,12 +84,15 @@ namespace DiscImageChef.DiscImages
throw new
FeatureSupportedButNotImplementedImageException($"Support for image type {vHdr.imageType} not yet implemented");
DateTime start = DateTime.UtcNow;
DicConsole.DebugWriteLine("VirtualBox plugin", "Reading Image Block Map");
stream.Seek(vHdr.offsetBlocks, SeekOrigin.Begin);
ibm = new uint[vHdr.blocks];
byte[] ibmB = new byte[vHdr.blocks * 4];
stream.Read(ibmB, 0, ibmB.Length);
for(int i = 0; i < ibm.Length; i++) ibm[i] = BitConverter.ToUInt32(ibmB, i * 4);
ibm = MemoryMarshal.Cast<byte, uint>(ibmB).ToArray();
DateTime end = DateTime.UtcNow;
DicConsole.DebugWriteLine("VirtualBox plugin", "Reading Image Block Map took {0} ms",
(end - start).TotalMilliseconds);
sectorCache = new Dictionary<ulong, byte[]>();
@@ -146,7 +150,7 @@ namespace DiscImageChef.DiscImages
ulong index = sectorAddress * vHdr.sectorSize / vHdr.blockSize;
ulong secOff = sectorAddress * vHdr.sectorSize % vHdr.blockSize;
uint ibmOff = ibm[index];
uint ibmOff = ibm[(int)index];
if(ibmOff == VDI_EMPTY) return new byte[vHdr.sectorSize];