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Implement Read() in FAT.

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Natalia Portillo
2019-04-27 00:56:49 +01:00
parent dfb96d13a5
commit 3b29d25f24
1 changed files with 37 additions and 1 deletions
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38
DiscImageChef.Filesystems/FAT/File.cs
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@@ -32,8 +32,10 @@
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using DiscImageChef.CommonTypes.Structs;
using FileAttributes = DiscImageChef.CommonTypes.Structs.FileAttributes;
namespace DiscImageChef.Filesystems.FAT
{
@@ -77,7 +79,41 @@ namespace DiscImageChef.Filesystems.FAT
{
if(!mounted) return Errno.AccessDenied;
throw new NotImplementedException();
Errno err = Stat(path, out FileEntryInfo stat);
if(err != Errno.NoError) return err;
if(stat.Attributes.HasFlag(FileAttributes.Directory) && !debug) return Errno.IsDirectory;
if(offset >= stat.Length) return Errno.InvalidArgument;
if(size + offset >= stat.Length) size = stat.Length - offset;
uint[] clusters = GetClusters((uint)stat.Inode);
long firstCluster = offset / bytesPerCluster;
long offsetInCluster = offset % bytesPerCluster;
long sizeInClusters = (size + offsetInCluster) / bytesPerCluster;
if((size + offsetInCluster) % bytesPerCluster > 0) sizeInClusters++;
MemoryStream ms = new MemoryStream();
for(int i = 0; i < sizeInClusters; i++)
{
if(i + firstCluster >= clusters.Length) return Errno.InvalidArgument;
byte[] buffer =
image.ReadSectors(firstClusterSector + (clusters[i + firstCluster] - 2) * sectorsPerCluster,
sectorsPerCluster);
ms.Write(buffer, 0, buffer.Length);
}
ms.Position = offsetInCluster;
buf = new byte[size];
ms.Read(buf, 0, (int)size);
return Errno.NoError;
}
public Errno Stat(string path, out FileEntryInfo stat)