// internal for testing
internal static unsafe ImmutableArray<byte> DecodeEmbeddedPortablePdbDebugDirectoryData(AbstractMemoryBlock block)
{
byte[] decompressed;
const int headerSize = 2 * sizeof(int);
var headerReader = new BlobReader(block.Pointer, headerSize);
if (headerReader.ReadUInt32() != PortablePdbVersions.DebugDirectoryEmbeddedSignature)
{
throw new BadImageFormatException(SR.UnexpectedEmbeddedPortablePdbDataSignature);
}
int decompressedSize = headerReader.ReadInt32();
try
{
decompressed = new byte[decompressedSize];
}
catch
{
throw new BadImageFormatException(SR.DataTooBig);
}
var compressed = new ReadOnlyUnmanagedMemoryStream(block.Pointer + headerSize, block.Size - headerSize);
var deflate = new DeflateStream(compressed, CompressionMode.Decompress, leaveOpen: true);
if (decompressedSize > 0)
{
int actualLength;
try
{
actualLength = deflate.TryReadAll(decompressed, 0, decompressed.Length);
}
catch (InvalidDataException e)
{
throw new BadImageFormatException(e.Message, e.InnerException);
}
if (actualLength != decompressed.Length)
{
throw new BadImageFormatException(SR.SizeMismatch);
}
}
// Check that there is no more compressed data left,
// in case the decompressed size specified in the header is smaller
// than the actual decompressed size of the data.
if (deflate.ReadByte() != -1)
{
throw new BadImageFormatException(SR.SizeMismatch);
}
return ImmutableByteArrayInterop.DangerousCreateFromUnderlyingArray(ref decompressed);
}
