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//===------ utils/archive2yaml.cpp - obj2yaml conversion tool ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "obj2yaml.h"
#include "llvm/BinaryFormat/Magic.h"
#include "llvm/ObjectYAML/ArchiveYAML.h"
using namespace llvm;
namespace {
class ArchiveDumper {
public:
Expected<ArchYAML::Archive *> dump(MemoryBufferRef Source) {
StringRef Buffer = Source.getBuffer();
assert(file_magic::archive == identify_magic(Buffer));
std::unique_ptr<ArchYAML::Archive> Obj =
std::make_unique<ArchYAML::Archive>();
StringRef Magic = "!<arch>\n";
if (!Buffer.startswith(Magic))
return createStringError(std::errc::not_supported,
"only regular archives are supported");
Obj->Magic = Magic;
Buffer = Buffer.drop_front(Magic.size());
Obj->Members.emplace();
while (!Buffer.empty()) {
uint64_t Offset = Buffer.data() - Source.getBuffer().data();
if (Buffer.size() < sizeof(ArchiveHeader))
return createStringError(
std::errc::illegal_byte_sequence,
"unable to read the header of a child at offset 0x%" PRIx64,
Offset);
const ArchiveHeader &Hdr =
*reinterpret_cast<const ArchiveHeader *>(Buffer.data());
Buffer = Buffer.drop_front(sizeof(ArchiveHeader));
auto ToString = [](ArrayRef<char> V) {
// We don't want to dump excessive spaces.
return StringRef(V.data(), V.size()).rtrim(' ');
};
ArchYAML::Archive::Child C;
C.Fields["Name"].Value = ToString(Hdr.Name);
C.Fields["LastModified"].Value = ToString(Hdr.LastModified);
C.Fields["UID"].Value = ToString(Hdr.UID);
C.Fields["GID"].Value = ToString(Hdr.GID);
C.Fields["AccessMode"].Value = ToString(Hdr.AccessMode);
StringRef SizeStr = ToString(Hdr.Size);
C.Fields["Size"].Value = SizeStr;
C.Fields["Terminator"].Value = ToString(Hdr.Terminator);
uint64_t Size;
if (SizeStr.getAsInteger(10, Size))
return createStringError(
std::errc::illegal_byte_sequence,
"unable to read the size of a child at offset 0x%" PRIx64
" as integer: \"%s\"",
Offset, SizeStr.str().c_str());
if (Buffer.size() < Size)
return createStringError(
std::errc::illegal_byte_sequence,
"unable to read the data of a child at offset 0x%" PRIx64
" of size %" PRId64 ": the remaining archive size is %zu",
Offset, Size, Buffer.size());
if (!Buffer.empty())
C.Content = arrayRefFromStringRef(Buffer.take_front(Size));
const bool HasPaddingByte = (Size & 1) && Buffer.size() > Size;
if (HasPaddingByte)
C.PaddingByte = Buffer[Size];
Obj->Members->push_back(C);
// If the size is odd, consume a padding byte.
Buffer = Buffer.drop_front(HasPaddingByte ? Size + 1 : Size);
}
return Obj.release();
}
private:
struct ArchiveHeader {
char Name[16];
char LastModified[12];
char UID[6];
char GID[6];
char AccessMode[8];
char Size[10];
char Terminator[2];
};
};
} // namespace
Error archive2yaml(raw_ostream &Out, MemoryBufferRef Source) {
ArchiveDumper Dumper;
Expected<ArchYAML::Archive *> YAMLOrErr = Dumper.dump(Source);
if (!YAMLOrErr)
return YAMLOrErr.takeError();
std::unique_ptr<ArchYAML::Archive> YAML(YAMLOrErr.get());
yaml::Output Yout(Out);
Yout << *YAML;
return Error::success();
}
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