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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
//===-- Decompressor.h ------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===/
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#ifndef LLVM_OBJECT_DECOMPRESSOR_H
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#define LLVM_OBJECT_DECOMPRESSOR_H
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Object/ObjectFile.h"
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namespace llvm {
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namespace object {
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/// Decompressor helps to handle decompression of compressed sections.
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class Decompressor {
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public:
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/// Create decompressor object.
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/// @param Name Section name.
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/// @param Data Section content.
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/// @param IsLE Flag determines if Data is in little endian form.
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/// @param Is64Bit Flag determines if object is 64 bit.
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static Expected<Decompressor> create(StringRef Name, StringRef Data,
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bool IsLE, bool Is64Bit);
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/// Resize the buffer and uncompress section data into it.
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/// @param Out Destination buffer.
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template <class T> Error resizeAndDecompress(T &Out) {
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Out.resize(DecompressedSize);
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return decompress({Out.data(), (size_t)DecompressedSize});
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}
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/// Uncompress section data to raw buffer provided.
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/// @param Buffer Destination buffer.
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Error decompress(MutableArrayRef<char> Buffer);
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/// Return memory buffer size required for decompression.
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uint64_t getDecompressedSize() { return DecompressedSize; }
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/// Return true if section is compressed, including gnu-styled case.
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static bool isCompressed(const object::SectionRef &Section);
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/// Return true if section is a ELF compressed one.
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static bool isCompressedELFSection(uint64_t Flags, StringRef Name);
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/// Return true if section name matches gnu style compressed one.
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static bool isGnuStyle(StringRef Name);
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private:
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Decompressor(StringRef Data);
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Error consumeCompressedGnuHeader();
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Error consumeCompressedZLibHeader(bool Is64Bit, bool IsLittleEndian);
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StringRef SectionData;
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uint64_t DecompressedSize;
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};
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} // end namespace object
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} // end namespace llvm
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#endif // LLVM_OBJECT_DECOMPRESSOR_H
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