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//===-- WindowsResource.cpp -------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the .res file class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Object/WindowsResource.h"
#include "llvm/Object/Error.h"
#include <system_error>
namespace llvm {
namespace object {
static const size_t ResourceMagicSize = 16;
static const size_t NullEntrySize = 16;
#define RETURN_IF_ERROR(X) \
if (auto EC = X) \
return EC;
WindowsResource::WindowsResource(MemoryBufferRef Source)
: Binary(Binary::ID_WinRes, Source) {
size_t LeadingSize = ResourceMagicSize + NullEntrySize;
BBS = BinaryByteStream(Data.getBuffer().drop_front(LeadingSize),
support::little);
}
WindowsResource::~WindowsResource() = default;
Expected<std::unique_ptr<WindowsResource>>
WindowsResource::createWindowsResource(MemoryBufferRef Source) {
if (Source.getBufferSize() < ResourceMagicSize + NullEntrySize)
return make_error<GenericBinaryError>(
"File too small to be a resource file",
object_error::invalid_file_type);
std::unique_ptr<WindowsResource> Ret(new WindowsResource(Source));
return std::move(Ret);
}
Expected<ResourceEntryRef> WindowsResource::getHeadEntry() {
Error Err = Error::success();
auto Ref = ResourceEntryRef(BinaryStreamRef(BBS), this, Err);
if (Err)
return std::move(Err);
return Ref;
}
ResourceEntryRef::ResourceEntryRef(BinaryStreamRef Ref,
const WindowsResource *Owner, Error &Err)
: Reader(Ref), OwningRes(Owner) {
if (loadNext())
Err = make_error<GenericBinaryError>("Could not read first entry.",
object_error::unexpected_eof);
}
Error ResourceEntryRef::moveNext(bool &End) {
// Reached end of all the entries.
if (Reader.bytesRemaining() == 0) {
End = true;
return Error::success();
}
RETURN_IF_ERROR(loadNext());
return Error::success();
}
Error ResourceEntryRef::loadNext() {
uint32_t DataSize;
RETURN_IF_ERROR(Reader.readInteger(DataSize));
uint32_t HeaderSize;
RETURN_IF_ERROR(Reader.readInteger(HeaderSize));
// The data and header size ints are themselves part of the header, so we must
// subtract them from the size.
RETURN_IF_ERROR(
Reader.readStreamRef(HeaderBytes, HeaderSize - 2 * sizeof(uint32_t)));
RETURN_IF_ERROR(Reader.readStreamRef(DataBytes, DataSize));
RETURN_IF_ERROR(Reader.padToAlignment(sizeof(uint32_t)));
return Error::success();
}
} // namespace object
} // namespace llvm
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