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Implement read for Opera.

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This commit is contained in:
Natalia Portillo
2019-08-02 01:41:42 +01:00
parent ea7b5efa24
commit 1a6baf1b16
1 changed files with 40 additions and 1 deletions
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41
DiscImageChef.Filesystems/Opera/File.cs
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@@ -37,7 +37,46 @@ namespace DiscImageChef.Filesystems
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 DirectoryEntryWithPointers entry);
if(err != Errno.NoError) return err;
if((entry.entry.flags & FLAGS_MASK) == (uint)FileFlags.Directory && !debug) return Errno.IsDirectory;
if(entry.pointers.Length < 1) return Errno.InvalidArgument;
if(entry.entry.byte_count == 0)
{
buf = new byte[0];
return Errno.NoError;
}
if(offset >= entry.entry.byte_count) return Errno.InvalidArgument;
if(size + offset >= entry.entry.byte_count) size = entry.entry.byte_count - offset;
long firstBlock = offset / entry.entry.block_size;
long offsetInBlock = offset % entry.entry.block_size;
long sizeInBlocks = (size + offsetInBlock) / entry.entry.block_size;
if((size + offsetInBlock) % entry.entry.block_size > 0) sizeInBlocks++;
uint fileBlockSizeRatio;
if(image.Info.SectorSize == 2336 || image.Info.SectorSize == 2352 || image.Info.SectorSize == 2448)
fileBlockSizeRatio = entry.entry.block_size / 2048;
else fileBlockSizeRatio = entry.entry.block_size / image.Info.SectorSize;
byte[] buffer = image.ReadSectors((ulong)(entry.pointers[0] + firstBlock * fileBlockSizeRatio),
(uint)(sizeInBlocks * fileBlockSizeRatio));
buf = new byte[size];
Array.Copy(buffer, offsetInBlock, buf, 0, size);
return Errno.NoError;
}
public Errno Stat(string path, out FileEntryInfo stat)
{