1 files changed, 68 insertions, 0 deletions
diff --git a/thirdparty/raw_pdb/src/PDB_SourceFileStream.cpp b/thirdparty/raw_pdb/src/PDB_SourceFileStream.cpp
new file mode 100644
index 000000000..fc860f622
--- /dev/null
+++ b/thirdparty/raw_pdb/src/PDB_SourceFileStream.cpp
@@ -0,0 +1,68 @@
+// Copyright 2011-2022, Molecular Matters GmbH <[email protected]>
+// See LICENSE.txt for licensing details (2-clause BSD License: https://opensource.org/licenses/BSD-2-Clause)
+
+#include "PDB_PCH.h"
+#include "PDB_SourceFileStream.h"
+
+
+// ------------------------------------------------------------------------------------------------
+// ------------------------------------------------------------------------------------------------
+PDB::SourceFileStream::SourceFileStream(void) PDB_NO_EXCEPT
+	: m_stream()
+	, m_moduleCount(0u)
+	, m_moduleIndices(nullptr)
+	, m_moduleFileCounts(nullptr)
+	, m_fileNameOffsets(nullptr)
+	, m_stringTable(nullptr)
+{
+}
+
+
+// ------------------------------------------------------------------------------------------------
+// ------------------------------------------------------------------------------------------------
+PDB::SourceFileStream::SourceFileStream(const DirectMSFStream& directStream, uint32_t size, uint32_t offset) PDB_NO_EXCEPT
+	: m_stream(directStream, size, offset)
+	, m_moduleCount(0u)
+	, m_moduleIndices(nullptr)
+	, m_moduleFileCounts(nullptr)
+	, m_fileNameOffsets(nullptr)
+	, m_stringTable(nullptr)
+{
+	// we are going to consume the whole source info sub-stream, so create a coalesced stream for faster read operations and direct access.
+	// the sub-stream has the following layout:
+	//	struct SourceInfoSubstream
+	//	{
+	//		uint16_t moduleCount;
+	//		uint16_t sourceFileCount;
+	//		uint16_t moduleIndices[moduleCount];
+	//		uint16_t moduleFileCounts[moduleCount];
+	//		uint32_t fileNameOffsets[realSourceFileCount];
+	//		char stringTable[][realSourceFileCount];
+	//	};
+	m_moduleCount = *m_stream.GetDataAtOffset<uint16_t>(0u);
+	size_t readOffset = sizeof(uint16_t);
+
+	// skip number of source files. this would only support 64k unique files and is no longer used.
+	// the number of source files is computed dynamically instead.
+	readOffset += sizeof(uint16_t);
+
+	// grab direct pointers into the stream data
+	m_moduleIndices = m_stream.GetDataAtOffset<uint16_t>(readOffset);
+	readOffset += sizeof(uint16_t) * m_moduleCount;
+
+	m_moduleFileCounts = m_stream.GetDataAtOffset<uint16_t>(readOffset);
+	readOffset += sizeof(uint16_t) * m_moduleCount;
+
+	// count the actual number of source files
+	size_t sourceFileCount = 0u;
+	for (unsigned int i = 0u; i < m_moduleCount; ++i)
+	{
+		sourceFileCount += m_moduleFileCounts[i];
+	}
+
+	m_fileNameOffsets = m_stream.GetDataAtOffset<uint32_t>(readOffset);
+	readOffset += sizeof(uint32_t) * sourceFileCount;
+
+	// grab a pointer into the string table
+	m_stringTable = m_stream.GetDataAtOffset<char>(readOffset);
+}