public SerializedMetadata(
MetadataSizes sizes,
BlobBuilder stringHeap,
ImmutableArray <int> stringMap)
{
Sizes = sizes;
StringHeap = stringHeap;
StringMap = stringMap;
}
internal SerializedMetadata GetSerializedMetadata(ImmutableArray <int> externalRowCounts, int metadataVersionByteCount, bool isStandaloneDebugMetadata)
{
var stringHeapBuilder = new HeapBlobBuilder(_stringHeapCapacity);
var stringMap = SerializeStringHeap(stringHeapBuilder, _strings, _stringHeapStartOffset);
Debug.Assert(HeapIndex.UserString == 0);
Debug.Assert((int)HeapIndex.String == 1);
Debug.Assert((int)HeapIndex.Blob == 2);
Debug.Assert((int)HeapIndex.Guid == 3);
var heapSizes = ImmutableArray.Create(
_userStringBuilder.Count,
stringHeapBuilder.Count,
_blobHeapSize,
_guidBuilder.Count);
var sizes = new MetadataSizes(GetRowCounts(), externalRowCounts, heapSizes, metadataVersionByteCount, isStandaloneDebugMetadata);
return(new SerializedMetadata(sizes, stringHeapBuilder, stringMap));
}
private static void SerializeStreamHeader(ref int offsetFromStartOfMetadata, int alignedStreamSize, string streamName, BlobBuilder builder)
{
// 4 for the first uint (offset), 4 for the second uint (padded size), length of stream name + 1 for null terminator (then padded)
int sizeOfStreamHeader = MetadataSizes.GetMetadataStreamHeaderSize(streamName);
builder.WriteInt32(offsetFromStartOfMetadata);
builder.WriteInt32(alignedStreamSize);
foreach (char ch in streamName)
{
builder.WriteByte((byte)ch);
}
// After offset, size, and stream name, write 0-bytes until we reach our padded size.
for (uint i = 8 + (uint)streamName.Length; i < sizeOfStreamHeader; i++)
{
builder.WriteByte(0);
}
offsetFromStartOfMetadata += alignedStreamSize;
}
internal static void SerializeMetadataHeader(BlobBuilder builder, string metadataVersion, MetadataSizes sizes)
{
int startOffset = builder.Count;
// signature
builder.WriteUInt32(0x424A5342);
// major version
builder.WriteUInt16(1);
// minor version
builder.WriteUInt16(1);
// reserved
builder.WriteUInt32(0);
// Spec (section 24.2.1 Metadata Root):
// Length ... Number of bytes allocated to hold version string (including null terminator), call this x.
// Call the length of the string (including the terminator) m (we require m <= 255);
// the length x is m rounded up to a multiple of four.
builder.WriteInt32(sizes.MetadataVersionPaddedLength);
int metadataVersionStart = builder.Count;
builder.WriteUTF8(metadataVersion);
builder.WriteByte(0);
int metadataVersionEnd = builder.Count;
for (int i = 0; i < sizes.MetadataVersionPaddedLength - (metadataVersionEnd - metadataVersionStart); i++)
{
builder.WriteByte(0);
}
// reserved
builder.WriteUInt16(0);
// number of streams
builder.WriteUInt16((ushort)(5 + (sizes.IsEncDelta ? 1 : 0) + (sizes.IsStandaloneDebugMetadata ? 1 : 0)));
// stream headers
int offsetFromStartOfMetadata = sizes.MetadataHeaderSize;
// emit the #Pdb stream first so that only a single page has to be read in order to find out PDB ID
if (sizes.IsStandaloneDebugMetadata)
{
SerializeStreamHeader(ref offsetFromStartOfMetadata, sizes.StandalonePdbStreamSize, "#Pdb", builder);
}
// Spec: Some compilers store metadata in a #- stream, which holds an uncompressed, or non-optimized, representation of metadata tables;
// this includes extra metadata -Ptr tables. Such PE files do not form part of ECMA-335 standard.
//
// Note: EnC delta is stored as uncompressed metadata stream.
SerializeStreamHeader(ref offsetFromStartOfMetadata, sizes.MetadataTableStreamSize, (sizes.IsCompressed ? "#~" : "#-"), builder);
SerializeStreamHeader(ref offsetFromStartOfMetadata, sizes.GetAlignedHeapSize(HeapIndex.String), "#Strings", builder);
SerializeStreamHeader(ref offsetFromStartOfMetadata, sizes.GetAlignedHeapSize(HeapIndex.UserString), "#US", builder);
SerializeStreamHeader(ref offsetFromStartOfMetadata, sizes.GetAlignedHeapSize(HeapIndex.Guid), "#GUID", builder);
SerializeStreamHeader(ref offsetFromStartOfMetadata, sizes.GetAlignedHeapSize(HeapIndex.Blob), "#Blob", builder);
if (sizes.IsEncDelta)
{
SerializeStreamHeader(ref offsetFromStartOfMetadata, 0, "#JTD", builder);
}
int endOffset = builder.Count;
Debug.Assert(endOffset - startOffset == sizes.MetadataHeaderSize);
}