1 files changed, 89 insertions, 0 deletions
diff --git a/llvm/include/llvm/DebugInfo/MSF/MsfCommon.h b/llvm/include/llvm/DebugInfo/MSF/MsfCommon.h
new file mode 100644
index 00000000000..58e6a1af426
--- /dev/null
+++ b/llvm/include/llvm/DebugInfo/MSF/MsfCommon.h
@@ -0,0 +1,89 @@
+//===- MSFCommon.h - 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.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_MSF_MSFCOMMON_H
+#define LLVM_DEBUGINFO_MSF_MSFCOMMON_H
+
+#include "llvm/ADT/ArrayRef.h"
+
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MathExtras.h"
+
+#include <vector>
+
+namespace llvm {
+namespace msf {
+static const char Magic[] = {'M',  'i',  'c',    'r', 'o', 's',  'o',  'f',
+                             't',  ' ',  'C',    '/', 'C', '+',  '+',  ' ',
+                             'M',  'S',  'F',    ' ', '7', '.',  '0',  '0',
+                             '\r', '\n', '\x1a', 'D', 'S', '\0', '\0', '\0'};
+
+// The superblock is overlaid at the beginning of the file (offset 0).
+// It starts with a magic header and is followed by information which
+// describes the layout of the file system.
+struct SuperBlock {
+  char MagicBytes[sizeof(Magic)];
+  // The file system is split into a variable number of fixed size elements.
+  // These elements are referred to as blocks.  The size of a block may vary
+  // from system to system.
+  support::ulittle32_t BlockSize;
+  // The index of the free block map.
+  support::ulittle32_t FreeBlockMapBlock;
+  // This contains the number of blocks resident in the file system.  In
+  // practice, NumBlocks * BlockSize is equivalent to the size of the MSF
+  // file.
+  support::ulittle32_t NumBlocks;
+  // This contains the number of bytes which make up the directory.
+  support::ulittle32_t NumDirectoryBytes;
+  // This field's purpose is not yet known.
+  support::ulittle32_t Unknown1;
+  // This contains the block # of the block map.
+  support::ulittle32_t BlockMapAddr;
+};
+
+struct MSFLayout {
+  MSFLayout() : SB(nullptr) {}
+  const SuperBlock *SB;
+  ArrayRef<support::ulittle32_t> DirectoryBlocks;
+  ArrayRef<support::ulittle32_t> StreamSizes;
+  std::vector<ArrayRef<support::ulittle32_t>> StreamMap;
+};
+
+inline bool isValidBlockSize(uint32_t Size) {
+  switch (Size) {
+  case 512:
+  case 1024:
+  case 2048:
+  case 4096:
+    return true;
+  }
+  return false;
+}
+
+// Super Block, Fpm0, Fpm1, and Block Map
+inline uint32_t getMinimumBlockCount() { return 4; }
+
+// Super Block, Fpm0, and Fpm1 are reserved.  The Block Map, although required
+// need not be at block 3.
+inline uint32_t getFirstUnreservedBlock() { return 3; }
+
+inline uint64_t bytesToBlocks(uint64_t NumBytes, uint64_t BlockSize) {
+  return alignTo(NumBytes, BlockSize) / BlockSize;
+}
+
+inline uint64_t blockToOffset(uint64_t BlockNumber, uint64_t BlockSize) {
+  return BlockNumber * BlockSize;
+}
+
+Error validateSuperBlock(const SuperBlock &SB);
+} // namespace msf
+} // namespace llvm
+
+#endif // LLVM_DEBUGINFO_MSF_MSFCOMMON_H