/// <summary>
/// Create a <see cref="MetadataBase"/> instance
/// </summary>
/// <param name="peImage">The PE image</param>
/// <param name="verify"><c>true</c> if we should verify that it's a .NET PE file</param>
/// <returns>A new <see cref="MetadataBase"/> instance</returns>
static MetadataBase Create(IPEImage peImage, bool verify)
{
MetadataBase md = null;
try {
var dotNetDir = peImage.ImageNTHeaders.OptionalHeader.DataDirectories[14];
// Mono doesn't check that the Size field is >= 0x48
if (dotNetDir.VirtualAddress == 0)
{
throw new BadImageFormatException(".NET data directory RVA is 0");
}
var cor20HeaderReader = peImage.CreateReader(dotNetDir.VirtualAddress, 0x48);
var cor20Header = new ImageCor20Header(ref cor20HeaderReader, verify);
if (cor20Header.Metadata.VirtualAddress == 0)
{
throw new BadImageFormatException(".NET metadata RVA is 0");
}
var mdRva = cor20Header.Metadata.VirtualAddress;
// Don't use the size field, Mono ignores it. Create a reader that can read to EOF.
var mdHeaderReader = peImage.CreateReader(mdRva);
var mdHeader = new MetadataHeader(ref mdHeaderReader, verify);
if (verify)
{
foreach (var sh in mdHeader.StreamHeaders)
{
if ((ulong)sh.Offset + sh.StreamSize > mdHeaderReader.EndOffset)
{
throw new BadImageFormatException("Invalid stream header");
}
}
}
switch (GetMetadataType(mdHeader.StreamHeaders))
{
case MetadataType.Compressed:
md = new CompressedMetadata(peImage, cor20Header, mdHeader);
break;
case MetadataType.ENC:
md = new ENCMetadata(peImage, cor20Header, mdHeader);
break;
default:
throw new BadImageFormatException("No #~ or #- stream found");
}
md.Initialize(null);
return(md);
}
catch {
if (md != null)
{
md.Dispose();
}
throw;
}
}
/// <summary>
/// Create a standalone portable PDB <see cref="MetadataBase"/> instance
/// </summary>
/// <param name="mdReaderFactory">Metadata stream</param>
/// <param name="verify"><c>true</c> if we should verify that it's a .NET PE file</param>
/// <returns>A new <see cref="MetadataBase"/> instance</returns>
internal static MetadataBase CreateStandalonePortablePDB(DataReaderFactory mdReaderFactory, bool verify)
{
MetadataBase md = null;
try {
var reader = mdReaderFactory.CreateReader();
var mdHeader = new MetadataHeader(ref reader, verify);
if (verify)
{
foreach (var sh in mdHeader.StreamHeaders)
{
if (sh.Offset + sh.StreamSize < sh.Offset || sh.Offset + sh.StreamSize > reader.Length)
{
throw new BadImageFormatException("Invalid stream header");
}
}
}
switch (GetMetadataType(mdHeader.StreamHeaders))
{
case MetadataType.Compressed:
md = new CompressedMetadata(mdHeader, true);
break;
case MetadataType.ENC:
md = new ENCMetadata(mdHeader, true);
break;
default:
throw new BadImageFormatException("No #~ or #- stream found");
}
md.Initialize(mdReaderFactory);
return(md);
}
catch {
md?.Dispose();
throw;
}
}