private IEnumerable <(DocumentHandle DocumentHandle, SourceTextInfo SourceTextInfo)> GetSourceTextInfoCore()
{
var encoding = GetEncoding();
var sourceFileCount = GetSourceFileCount();
foreach (var documentHandle in PdbReader.Documents.Take(sourceFileCount))
{
var document = PdbReader.GetDocument(documentHandle);
var name = PdbReader.GetString(document.Name);
var hashAlgorithmGuid = PdbReader.GetGuid(document.HashAlgorithm);
var hashAlgorithm =
hashAlgorithmGuid == HashAlgorithmSha1
? SourceHashAlgorithm.Sha1
: hashAlgorithmGuid == HashAlgorithmSha256
? SourceHashAlgorithm.Sha256
: SourceHashAlgorithm.None;
var hash = PdbReader.GetBlobBytes(document.Hash);
var sourceTextInfo = new SourceTextInfo(
name,
hashAlgorithm,
hash.ToImmutableArray(),
encoding
);
yield return(documentHandle, sourceTextInfo);
}
}
private EmbeddedSourceTextInfo?ResolveEmbeddedSource(
DocumentHandle document,
SourceTextInfo sourceTextInfo
)
{
byte[] bytes = (
from handle in PdbReader.GetCustomDebugInformation(document)
let cdi = PdbReader.GetCustomDebugInformation(handle)
where PdbReader.GetGuid(cdi.Kind) == EmbeddedSourceGuid
select PdbReader.GetBlobBytes(cdi.Value)
).SingleOrDefault();
if (bytes is null)
{
return(null);
}
int uncompressedSize = BitConverter.ToInt32(bytes, 0);
var stream = new MemoryStream(bytes, sizeof(int), bytes.Length - sizeof(int));
byte[]? compressedHash = null;
if (uncompressedSize != 0)
{
using var algorithm =
CryptographicHashProvider.TryGetAlgorithm(sourceTextInfo.HashAlgorithm)
?? throw new InvalidOperationException();
compressedHash = algorithm.ComputeHash(bytes);
var decompressed = new MemoryStream(uncompressedSize);
using (var deflater = new DeflateStream(stream, CompressionMode.Decompress))
{
deflater.CopyTo(decompressed);
}
if (decompressed.Length != uncompressedSize)
{
throw new InvalidDataException();
}
stream = decompressed;
}
using (stream)
{
// todo: IVT and EncodedStringText.Create?
var embeddedText = SourceText.From(
stream,
encoding: sourceTextInfo.SourceTextEncoding,
checksumAlgorithm: sourceTextInfo.HashAlgorithm,
canBeEmbedded: true
);
return(new EmbeddedSourceTextInfo(
sourceTextInfo,
embeddedText,
compressedHash?.ToImmutableArray() ?? ImmutableArray <byte> .Empty
));
}
}
private (SourceText?embeddedText, byte[]? compressedHash) ResolveEmbeddedSource(DocumentHandle document, SourceHashAlgorithm hashAlgorithm, Encoding encoding)
{
byte[] bytes = (from handle in PdbReader.GetCustomDebugInformation(document)
let cdi = PdbReader.GetCustomDebugInformation(handle)
where PdbReader.GetGuid(cdi.Kind) == EmbeddedSourceGuid
select PdbReader.GetBlobBytes(cdi.Value)).SingleOrDefault();
if (bytes == null)
{
return(default);