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//===- Minidump.cpp - Minidump object file implementation -----------------===//
//
// 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 "llvm/Object/Minidump.h"
#include "llvm/Object/Error.h"
#include "llvm/Support/ConvertUTF.h"
using namespace llvm;
using namespace llvm::object;
using namespace llvm::minidump;
Optional<ArrayRef<uint8_t>>
MinidumpFile::getRawStream(minidump::StreamType Type) const {
auto It = StreamMap.find(Type);
if (It != StreamMap.end())
return getRawStream(Streams[It->second]);
return None;
}
Expected<std::string> MinidumpFile::getString(size_t Offset) const {
// Minidump strings consist of a 32-bit length field, which gives the size of
// the string in *bytes*. This is followed by the actual string encoded in
// UTF16.
auto ExpectedSize =
getDataSliceAs<support::ulittle32_t>(getData(), Offset, 1);
if (!ExpectedSize)
return ExpectedSize.takeError();
size_t Size = (*ExpectedSize)[0];
if (Size % 2 != 0)
return createError("String size not even");
Size /= 2;
if (Size == 0)
return "";
Offset += sizeof(support::ulittle32_t);
auto ExpectedData =
getDataSliceAs<support::ulittle16_t>(getData(), Offset, Size);
if (!ExpectedData)
return ExpectedData.takeError();
SmallVector<UTF16, 32> WStr(Size);
copy(*ExpectedData, WStr.begin());
std::string Result;
if (!convertUTF16ToUTF8String(WStr, Result))
return createError("String decoding failed");
return Result;
}
Expected<ArrayRef<uint8_t>>
MinidumpFile::getDataSlice(ArrayRef<uint8_t> Data, size_t Offset, size_t Size) {
// Check for overflow.
if (Offset + Size < Offset || Offset + Size < Size ||
Offset + Size > Data.size())
return createEOFError();
return Data.slice(Offset, Size);
}
Expected<std::unique_ptr<MinidumpFile>>
MinidumpFile::create(MemoryBufferRef Source) {
ArrayRef<uint8_t> Data = arrayRefFromStringRef(Source.getBuffer());
auto ExpectedHeader = getDataSliceAs<minidump::Header>(Data, 0, 1);
if (!ExpectedHeader)
return ExpectedHeader.takeError();
const minidump::Header &Hdr = (*ExpectedHeader)[0];
if (Hdr.Signature != Header::MagicSignature)
return createError("Invalid signature");
if ((Hdr.Version & 0xffff) != Header::MagicVersion)
return createError("Invalid version");
auto ExpectedStreams = getDataSliceAs<Directory>(Data, Hdr.StreamDirectoryRVA,
Hdr.NumberOfStreams);
if (!ExpectedStreams)
return ExpectedStreams.takeError();
DenseMap<StreamType, std::size_t> StreamMap;
for (const auto &Stream : llvm::enumerate(*ExpectedStreams)) {
StreamType Type = Stream.value().Type;
const LocationDescriptor &Loc = Stream.value().Location;
auto ExpectedStream = getDataSlice(Data, Loc.RVA, Loc.DataSize);
if (!ExpectedStream)
return ExpectedStream.takeError();
if (Type == StreamType::Unused && Loc.DataSize == 0) {
// Ignore dummy streams. This is technically ill-formed, but a number of
// existing minidumps seem to contain such streams.
continue;
}
if (Type == DenseMapInfo<StreamType>::getEmptyKey() ||
Type == DenseMapInfo<StreamType>::getTombstoneKey())
return createError("Cannot handle one of the minidump streams");
// Update the directory map, checking for duplicate stream types.
if (!StreamMap.try_emplace(Type, Stream.index()).second)
return createError("Duplicate stream type");
}
return std::unique_ptr<MinidumpFile>(
new MinidumpFile(Source, Hdr, *ExpectedStreams, std::move(StreamMap)));
}
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