1 files changed, 57 insertions, 0 deletions
diff --git a/contrib/llvm/lib/DebugInfo/MSF/MSFCommon.cpp b/contrib/llvm/lib/DebugInfo/MSF/MSFCommon.cpp
new file mode 100644
index 0000000..fdab788
--- /dev/null
+++ b/contrib/llvm/lib/DebugInfo/MSF/MSFCommon.cpp
@@ -0,0 +1,57 @@
+//===- MSFCommon.cpp - Common types and functions for MSF files -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/DebugInfo/MSF/MSFCommon.h"
+#include "llvm/DebugInfo/MSF/MSFError.h"
+
+using namespace llvm;
+using namespace llvm::msf;
+
+Error llvm::msf::validateSuperBlock(const SuperBlock &SB) {
+  // Check the magic bytes.
+  if (std::memcmp(SB.MagicBytes, Magic, sizeof(Magic)) != 0)
+    return make_error<MSFError>(msf_error_code::invalid_format,
+                                "MSF magic header doesn't match");
+
+  if (!isValidBlockSize(SB.BlockSize))
+    return make_error<MSFError>(msf_error_code::invalid_format,
+                                "Unsupported block size.");
+
+  // We don't support directories whose sizes aren't a multiple of four bytes.
+  if (SB.NumDirectoryBytes % sizeof(support::ulittle32_t) != 0)
+    return make_error<MSFError>(msf_error_code::invalid_format,
+                                "Directory size is not multiple of 4.");
+
+  // The number of blocks which comprise the directory is a simple function of
+  // the number of bytes it contains.
+  uint64_t NumDirectoryBlocks =
+      bytesToBlocks(SB.NumDirectoryBytes, SB.BlockSize);
+
+  // The directory, as we understand it, is a block which consists of a list of
+  // block numbers.  It is unclear what would happen if the number of blocks
+  // couldn't fit on a single block.
+  if (NumDirectoryBlocks > SB.BlockSize / sizeof(support::ulittle32_t))
+    return make_error<MSFError>(msf_error_code::invalid_format,
+                                "Too many directory blocks.");
+
+  if (SB.BlockMapAddr == 0)
+    return make_error<MSFError>(msf_error_code::invalid_format,
+                                "Block 0 is reserved");
+
+  if (SB.BlockMapAddr >= SB.NumBlocks)
+    return make_error<MSFError>(msf_error_code::invalid_format,
+                                "Block map address is invalid.");
+
+  if (SB.FreeBlockMapBlock != 1 && SB.FreeBlockMapBlock != 2)
+    return make_error<MSFError>(
+        msf_error_code::invalid_format,
+        "The free block map isn't at block 1 or block 2.");
+
+  return Error::success();
+}