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//===- BinaryStreamWriter.cpp - Writes objects to a BinaryStream ----------===//
//
// 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/Support/BinaryStreamWriter.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/BinaryStreamRef.h"
#include "llvm/Support/LEB128.h"
using namespace llvm;
BinaryStreamWriter::BinaryStreamWriter(WritableBinaryStreamRef Ref)
: Stream(Ref) {}
BinaryStreamWriter::BinaryStreamWriter(WritableBinaryStream &Stream)
: Stream(Stream) {}
BinaryStreamWriter::BinaryStreamWriter(MutableArrayRef<uint8_t> Data,
llvm::support::endianness Endian)
: Stream(Data, Endian) {}
Error BinaryStreamWriter::writeBytes(ArrayRef<uint8_t> Buffer) {
if (auto EC = Stream.writeBytes(Offset, Buffer))
return EC;
Offset += Buffer.size();
return Error::success();
}
Error BinaryStreamWriter::writeULEB128(uint64_t Value) {
uint8_t EncodedBytes[10] = {0};
unsigned Size = encodeULEB128(Value, &EncodedBytes[0]);
return writeBytes({EncodedBytes, Size});
}
Error BinaryStreamWriter::writeSLEB128(int64_t Value) {
uint8_t EncodedBytes[10] = {0};
unsigned Size = encodeSLEB128(Value, &EncodedBytes[0]);
return writeBytes({EncodedBytes, Size});
}
Error BinaryStreamWriter::writeCString(StringRef Str) {
if (auto EC = writeFixedString(Str))
return EC;
if (auto EC = writeObject('\0'))
return EC;
return Error::success();
}
Error BinaryStreamWriter::writeFixedString(StringRef Str) {
return writeBytes(arrayRefFromStringRef(Str));
}
Error BinaryStreamWriter::writeStreamRef(BinaryStreamRef Ref) {
return writeStreamRef(Ref, Ref.getLength());
}
Error BinaryStreamWriter::writeStreamRef(BinaryStreamRef Ref, uint64_t Length) {
BinaryStreamReader SrcReader(Ref.slice(0, Length));
// This is a bit tricky. If we just call readBytes, we are requiring that it
// return us the entire stream as a contiguous buffer. There is no guarantee
// this can be satisfied by returning a reference straight from the buffer, as
// an implementation may not store all data in a single contiguous buffer. So
// we iterate over each contiguous chunk, writing each one in succession.
while (SrcReader.bytesRemaining() > 0) {
ArrayRef<uint8_t> Chunk;
if (auto EC = SrcReader.readLongestContiguousChunk(Chunk))
return EC;
if (auto EC = writeBytes(Chunk))
return EC;
}
return Error::success();
}
std::pair<BinaryStreamWriter, BinaryStreamWriter>
BinaryStreamWriter::split(uint64_t Off) const {
assert(getLength() >= Off);
WritableBinaryStreamRef First = Stream.drop_front(Offset);
WritableBinaryStreamRef Second = First.drop_front(Off);
First = First.keep_front(Off);
BinaryStreamWriter W1{First};
BinaryStreamWriter W2{Second};
return std::make_pair(W1, W2);
}
Error BinaryStreamWriter::padToAlignment(uint32_t Align) {
uint64_t NewOffset = alignTo(Offset, Align);
const uint64_t ZerosSize = 64;
static constexpr char Zeros[ZerosSize] = {};
while (Offset < NewOffset)
if (auto E = writeArray(
ArrayRef<char>(Zeros, std::min(ZerosSize, NewOffset - Offset))))
return E;
return Error::success();
}
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