1 files changed, 66 insertions, 0 deletions
diff --git a/third_party/llvm-project/include/llvm/Object/Decompressor.h b/third_party/llvm-project/include/llvm/Object/Decompressor.h
new file mode 100644
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--- /dev/null
+++ b/third_party/llvm-project/include/llvm/Object/Decompressor.h
@@ -0,0 +1,66 @@
+//===-- Decompressor.h ------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===/
+
+#ifndef LLVM_OBJECT_DECOMPRESSOR_H
+#define LLVM_OBJECT_DECOMPRESSOR_H
+
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Object/ObjectFile.h"
+
+namespace llvm {
+namespace object {
+
+/// Decompressor helps to handle decompression of compressed sections.
+class Decompressor {
+public:
+  /// Create decompressor object.
+  /// @param Name        Section name.
+  /// @param Data        Section content.
+  /// @param IsLE        Flag determines if Data is in little endian form.
+  /// @param Is64Bit     Flag determines if object is 64 bit.
+  static Expected<Decompressor> create(StringRef Name, StringRef Data,
+                                       bool IsLE, bool Is64Bit);
+
+  /// Resize the buffer and uncompress section data into it.
+  /// @param Out         Destination buffer.
+  template <class T> Error resizeAndDecompress(T &Out) {
+    Out.resize(DecompressedSize);
+    return decompress({Out.data(), (size_t)DecompressedSize});
+  }
+
+  /// Uncompress section data to raw buffer provided.
+  /// @param Buffer      Destination buffer.
+  Error decompress(MutableArrayRef<char> Buffer);
+
+  /// Return memory buffer size required for decompression.
+  uint64_t getDecompressedSize() { return DecompressedSize; }
+
+  /// Return true if section is compressed, including gnu-styled case.
+  static bool isCompressed(const object::SectionRef &Section);
+
+  /// Return true if section is a ELF compressed one.
+  static bool isCompressedELFSection(uint64_t Flags, StringRef Name);
+
+  /// Return true if section name matches gnu style compressed one.
+  static bool isGnuStyle(StringRef Name);
+
+private:
+  Decompressor(StringRef Data);
+
+  Error consumeCompressedGnuHeader();
+  Error consumeCompressedZLibHeader(bool Is64Bit, bool IsLittleEndian);
+
+  StringRef SectionData;
+  uint64_t DecompressedSize;
+};
+
+} // end namespace object
+} // end namespace llvm
+
+#endif // LLVM_OBJECT_DECOMPRESSOR_H