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//===- DXContainer.cpp - DXContainer 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/DXContainer.h"
#include "llvm/BinaryFormat/DXContainer.h"
#include "llvm/Object/Error.h"
using namespace llvm;
using namespace llvm::object;
static Error parseFailed(const Twine &Msg) {
return make_error<GenericBinaryError>(Msg.str(), object_error::parse_failed);
}
template <typename T>
static Error readStruct(StringRef Buffer, const char *P, T &Struct) {
// Don't read before the beginning or past the end of the file
if (P < Buffer.begin() || P + sizeof(T) > Buffer.end())
return parseFailed("Reading structure out of file bounds");
memcpy(&Struct, P, sizeof(T));
// DXContainer is always BigEndian
if (sys::IsBigEndianHost)
Struct.byteSwap();
return Error::success();
}
DXContainer::DXContainer(MemoryBufferRef O) : Data(O) {}
Error DXContainer::parseHeader() {
return readStruct(Data.getBuffer(), Data.getBuffer().data(), Header);
}
Expected<DXContainer> DXContainer::create(MemoryBufferRef Object) {
DXContainer Container(Object);
if (Error Err = Container.parseHeader())
return std::move(Err);
return Container;
}
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