1 //===-- Decompressor.h ------------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===/ 9 10 #ifndef LLVM_OBJECT_DECOMPRESSOR_H 11 #define LLVM_OBJECT_DECOMPRESSOR_H 12 13 #include "llvm/ADT/StringRef.h" 14 #include "llvm/ADT/SmallString.h" 15 #include "llvm/Object/ObjectFile.h" 16 17 namespace llvm { 18 namespace object { 19 20 /// @brief Decompressor helps to handle decompression of compressed sections. 21 class Decompressor { 22 public: 23 /// @brief Create decompressor object. 24 /// @param Name Section name. 25 /// @param Data Section content. 26 /// @param IsLE Flag determines if Data is in little endian form. 27 /// @param Is64Bit Flag determines if object is 64 bit. 28 static Expected<Decompressor> create(StringRef Name, StringRef Data, 29 bool IsLE, bool Is64Bit); 30 31 /// @brief Resize the buffer and uncompress section data into it. 32 /// @param Out Destination buffer. 33 Error decompress(SmallString<32> &Out); 34 35 /// @brief Uncompress section data to raw buffer provided. 36 /// @param Buffer Destination buffer. 37 Error decompress(MutableArrayRef<char> Buffer); 38 39 /// @brief Return memory buffer size required for decompression. 40 uint64_t getDecompressedSize() { return DecompressedSize; } 41 42 /// @brief Return true if section is compressed, including gnu-styled case. 43 static bool isCompressed(const object::SectionRef &Section); 44 45 /// @brief Return true if section is a ELF compressed one. 46 static bool isCompressedELFSection(uint64_t Flags, StringRef Name); 47 48 /// @brief Return true if section name matches gnu style compressed one. 49 static bool isGnuStyle(StringRef Name); 50 51 private: 52 Decompressor(StringRef Data); 53 54 Error consumeCompressedGnuHeader(); 55 Error consumeCompressedZLibHeader(bool Is64Bit, bool IsLittleEndian); 56 57 StringRef SectionData; 58 uint64_t DecompressedSize; 59 }; 60 61 } // end namespace object 62 } // end namespace llvm 63 64 #endif // LLVM_OBJECT_DECOMPRESSOR_H 65
