0b140d0910
llvm::object::Decompressor is used by many DWARF consumers like llvm-dwarfdump, llvm-dwp, llvm-symbolizer. Add tests to them. The lldb test can be left to D133530. Reviewed By: dblaikie Differential Revision: https://reviews.llvm.org/D134116
70 lines
2.5 KiB
C++
70 lines
2.5 KiB
C++
//===-- Decompressor.cpp --------------------------------------------------===//
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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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#include "llvm/Object/Decompressor.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Compression.h"
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#include "llvm/Support/DataExtractor.h"
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#include "llvm/Support/Endian.h"
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using namespace llvm;
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using namespace llvm::support::endian;
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using namespace object;
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Expected<Decompressor> Decompressor::create(StringRef Name, StringRef Data,
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bool IsLE, bool Is64Bit) {
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Decompressor D(Data);
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if (Error Err = D.consumeCompressedHeader(Is64Bit, IsLE))
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return std::move(Err);
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return D;
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}
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Decompressor::Decompressor(StringRef Data)
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: SectionData(Data), DecompressedSize(0) {}
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Error Decompressor::consumeCompressedHeader(bool Is64Bit, bool IsLittleEndian) {
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using namespace ELF;
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uint64_t HdrSize = Is64Bit ? sizeof(Elf64_Chdr) : sizeof(Elf32_Chdr);
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if (SectionData.size() < HdrSize)
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return createError("corrupted compressed section header");
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DataExtractor Extractor(SectionData, IsLittleEndian, 0);
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uint64_t Offset = 0;
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auto ChType = Extractor.getUnsigned(&Offset, Is64Bit ? sizeof(Elf64_Word)
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: sizeof(Elf32_Word));
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switch (ChType) {
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case ELFCOMPRESS_ZLIB:
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CompressionType = DebugCompressionType::Zlib;
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break;
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case ELFCOMPRESS_ZSTD:
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CompressionType = DebugCompressionType::Zstd;
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break;
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default:
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return createError("unsupported compression type (" + Twine(ChType) + ")");
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}
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if (const char *Reason = llvm::compression::getReasonIfUnsupported(
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compression::formatFor(CompressionType)))
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return createError(Reason);
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// Skip Elf64_Chdr::ch_reserved field.
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if (Is64Bit)
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Offset += sizeof(Elf64_Word);
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DecompressedSize = Extractor.getUnsigned(
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&Offset, Is64Bit ? sizeof(Elf64_Xword) : sizeof(Elf32_Word));
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SectionData = SectionData.substr(HdrSize);
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return Error::success();
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}
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Error Decompressor::decompress(MutableArrayRef<uint8_t> Output) {
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return compression::decompress(CompressionType,
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arrayRefFromStringRef(SectionData),
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Output.data(), Output.size());
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}
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