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//===-- Decompressor.h ------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===/
#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
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