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//===- BinaryStreamWriter.cpp - Writes objects to a BinaryStream ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/MSF/BinaryStreamWriter.h"
#include "llvm/DebugInfo/MSF/BinaryStreamReader.h"
#include "llvm/DebugInfo/MSF/BinaryStreamRef.h"
using namespace llvm;
BinaryStreamWriter::BinaryStreamWriter(WritableBinaryStreamRef S)
: Stream(S), Offset(0) {}
Error BinaryStreamWriter::writeBytes(ArrayRef<uint8_t> Buffer) {
if (auto EC = Stream.writeBytes(Offset, Buffer))
return EC;
Offset += Buffer.size();
return Error::success();
}
Error BinaryStreamWriter::writeInteger(uint64_t Value, uint32_t ByteSize) {
assert(ByteSize == 1 || ByteSize == 2 || ByteSize == 4 || ByteSize == 8);
uint8_t Bytes[8];
MutableArrayRef<uint8_t> Buffer(Bytes);
Buffer = Buffer.take_front(ByteSize);
switch (ByteSize) {
case 1:
Buffer[0] = static_cast<uint8_t>(Value);
break;
case 2:
llvm::support::endian::write16(Buffer.data(), Value, Stream.getEndian());
break;
case 4:
llvm::support::endian::write32(Buffer.data(), Value, Stream.getEndian());
break;
case 8:
llvm::support::endian::write64(Buffer.data(), Value, Stream.getEndian());
break;
}
return writeBytes(Buffer);
}
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(ArrayRef<uint8_t>(Str.bytes_begin(), Str.bytes_end()));
}
Error BinaryStreamWriter::writeStreamRef(BinaryStreamRef Ref) {
return writeStreamRef(Ref, Ref.getLength());
}
Error BinaryStreamWriter::writeStreamRef(BinaryStreamRef Ref, uint32_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();
}
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