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5ef47e6205
This teaches obj2yaml to dump valid regular (not thin) archives. This also teaches yaml2obj to recognize archives YAML descriptions, what allows to craft all different kinds of archives (valid and broken ones). Differential revision: https://reviews.llvm.org/D89949
115 lines
3.7 KiB
C++
115 lines
3.7 KiB
C++
//===------ utils/archive2yaml.cpp - obj2yaml conversion tool ---*- 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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#include "obj2yaml.h"
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#include "llvm/BinaryFormat/Magic.h"
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#include "llvm/ObjectYAML/ArchiveYAML.h"
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using namespace llvm;
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namespace {
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class ArchiveDumper {
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public:
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Expected<ArchYAML::Archive *> dump(MemoryBufferRef Source) {
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StringRef Buffer = Source.getBuffer();
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assert(file_magic::archive == identify_magic(Buffer));
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std::unique_ptr<ArchYAML::Archive> Obj =
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std::make_unique<ArchYAML::Archive>();
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StringRef Magic = "!<arch>\n";
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if (!Buffer.startswith(Magic))
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return createStringError(std::errc::not_supported,
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"only regular archives are supported");
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Obj->Magic = Magic;
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Buffer = Buffer.drop_front(Magic.size());
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Obj->Members.emplace();
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while (!Buffer.empty()) {
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uint64_t Offset = Buffer.data() - Source.getBuffer().data();
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if (Buffer.size() < sizeof(ArchiveHeader))
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return createStringError(
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std::errc::illegal_byte_sequence,
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"unable to read the header of a child at offset 0x%" PRIx64,
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Offset);
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const ArchiveHeader &Hdr =
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*reinterpret_cast<const ArchiveHeader *>(Buffer.data());
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Buffer = Buffer.drop_front(sizeof(ArchiveHeader));
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auto ToString = [](ArrayRef<char> V) {
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// We don't want to dump excessive spaces.
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return StringRef(V.data(), V.size()).rtrim(' ');
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};
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ArchYAML::Archive::Child C;
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C.Fields["Name"].Value = ToString(Hdr.Name);
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C.Fields["LastModified"].Value = ToString(Hdr.LastModified);
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C.Fields["UID"].Value = ToString(Hdr.UID);
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C.Fields["GID"].Value = ToString(Hdr.GID);
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C.Fields["AccessMode"].Value = ToString(Hdr.AccessMode);
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StringRef SizeStr = ToString(Hdr.Size);
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C.Fields["Size"].Value = SizeStr;
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C.Fields["Terminator"].Value = ToString(Hdr.Terminator);
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uint64_t Size;
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if (SizeStr.getAsInteger(10, Size))
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return createStringError(
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std::errc::illegal_byte_sequence,
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"unable to read the size of a child at offset 0x%" PRIx64
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" as integer: \"%s\"",
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Offset, SizeStr.str().c_str());
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if (Buffer.size() < Size)
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return createStringError(
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std::errc::illegal_byte_sequence,
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"unable to read the data of a child at offset 0x%" PRIx64
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" of size %" PRId64 ": the remaining archive size is %zu",
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Offset, Size, Buffer.size());
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if (!Buffer.empty())
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C.Content = arrayRefFromStringRef(Buffer.take_front(Size));
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const bool HasPaddingByte = (Size & 1) && Buffer.size() > Size;
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if (HasPaddingByte)
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C.PaddingByte = Buffer[Size];
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Obj->Members->push_back(C);
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// If the size is odd, consume a padding byte.
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Buffer = Buffer.drop_front(HasPaddingByte ? Size + 1 : Size);
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}
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return Obj.release();
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}
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private:
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struct ArchiveHeader {
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char Name[16];
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char LastModified[12];
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char UID[6];
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char GID[6];
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char AccessMode[8];
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char Size[10];
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char Terminator[2];
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};
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};
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} // namespace
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Error archive2yaml(raw_ostream &Out, MemoryBufferRef Source) {
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ArchiveDumper Dumper;
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Expected<ArchYAML::Archive *> YAMLOrErr = Dumper.dump(Source);
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if (!YAMLOrErr)
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return YAMLOrErr.takeError();
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std::unique_ptr<ArchYAML::Archive> YAML(YAMLOrErr.get());
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yaml::Output Yout(Out);
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Yout << *YAML;
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return Error::success();
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}
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