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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/Support/BinaryStreamWriter.h"
#include "llvm/Support/BinaryStreamError.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/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::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();
}
Error BinaryStreamWriter::padToAlignment(uint32_t Align) {
uint32_t NewOffset = alignTo(Offset, Align);
if (NewOffset > getLength())
return make_error<BinaryStreamError>(stream_error_code::stream_too_short);
Offset = NewOffset;
return Error::success();
}
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