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Implement ISO9660 read.

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This commit is contained in:
Natalia Portillo
2019-07-20 00:38:59 +01:00
parent 7c5d0e3341
commit ea8411f641
1 changed files with 36 additions and 1 deletions
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37
DiscImageChef.Filesystems/ISO9660/File.cs
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@@ -1,8 +1,10 @@
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using DiscImageChef.CommonTypes.Structs;
using FileAttributes = DiscImageChef.CommonTypes.Structs.FileAttributes;
namespace DiscImageChef.Filesystems.ISO9660
{
@@ -37,7 +39,40 @@ namespace DiscImageChef.Filesystems.ISO9660
return Errno.NoError;
}
public Errno Read(string path, long offset, long size, ref byte[] buf) => throw new NotImplementedException();
public Errno Read(string path, long offset, long size, ref byte[] buf)
{
buf = null;
if(!mounted) return Errno.AccessDenied;
Errno err = GetFileEntry(path, out DecodedDirectoryEntry entry);
if(err != Errno.NoError) return err;
if(entry.Flags.HasFlag(FileFlags.Directory) && !debug) return Errno.IsDirectory;
if(offset >= entry.Size) return Errno.InvalidArgument;
if(size + offset >= entry.Size) size = entry.Size - offset;
if(entry.Size == 0)
{
buf = new byte[0];
return Errno.NoError;
}
// TODO: XA
long firstSector = offset / 2048;
long offsetInSector = offset % 2048;
long sizeInSectors = (size + offsetInSector) / 2048;
if((size + offsetInSector) % 2048 > 0) sizeInSectors++;
MemoryStream ms = new MemoryStream();
byte[] buffer = image.ReadSectors((ulong)(entry.Extent + firstSector), (uint)sizeInSectors);
buf = new byte[size];
Array.Copy(buffer, offsetInSector, buf, 0, size);
return Errno.NoError;
}
public Errno Stat(string path, out FileEntryInfo stat)
{