Differential D109923 Diff 373100 llvm/lib/Support/BinaryStreamWriter.cpp

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llvm/lib/Support/BinaryStreamWriter.cpp

Show First 20 Lines • Show All 56 Lines • ▼ Show 20 Lines	Error BinaryStreamWriter::writeFixedString(StringRef Str) {

return writeBytes(arrayRefFromStringRef(Str));		return writeBytes(arrayRefFromStringRef(Str));
}		}

Error BinaryStreamWriter::writeStreamRef(BinaryStreamRef Ref) {		Error BinaryStreamWriter::writeStreamRef(BinaryStreamRef Ref) {
return writeStreamRef(Ref, Ref.getLength());		return writeStreamRef(Ref, Ref.getLength());
}		}

Error BinaryStreamWriter::writeStreamRef(BinaryStreamRef Ref, uint32_t Length) {		Error BinaryStreamWriter::writeStreamRef(BinaryStreamRef Ref, uint64_t Length) {
BinaryStreamReader SrcReader(Ref.slice(0, Length));		BinaryStreamReader SrcReader(Ref.slice(0, Length));
// This is a bit tricky. If we just call readBytes, we are requiring that it		// 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		// 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		// 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		// an implementation may not store all data in a single contiguous buffer. So
// we iterate over each contiguous chunk, writing each one in succession.		// we iterate over each contiguous chunk, writing each one in succession.
while (SrcReader.bytesRemaining() > 0) {		while (SrcReader.bytesRemaining() > 0) {
ArrayRef<uint8_t> Chunk;		ArrayRef<uint8_t> Chunk;
if (auto EC = SrcReader.readLongestContiguousChunk(Chunk))		if (auto EC = SrcReader.readLongestContiguousChunk(Chunk))
return EC;		return EC;
if (auto EC = writeBytes(Chunk))		if (auto EC = writeBytes(Chunk))
return EC;		return EC;
}		}
return Error::success();		return Error::success();
}		}

std::pair<BinaryStreamWriter, BinaryStreamWriter>		std::pair<BinaryStreamWriter, BinaryStreamWriter>
BinaryStreamWriter::split(uint32_t Off) const {		BinaryStreamWriter::split(uint64_t Off) const {
assert(getLength() >= Off);		assert(getLength() >= Off);

WritableBinaryStreamRef First = Stream.drop_front(Offset);		WritableBinaryStreamRef First = Stream.drop_front(Offset);

WritableBinaryStreamRef Second = First.drop_front(Off);		WritableBinaryStreamRef Second = First.drop_front(Off);
First = First.keep_front(Off);		First = First.keep_front(Off);
BinaryStreamWriter W1{First};		BinaryStreamWriter W1{First};
BinaryStreamWriter W2{Second};		BinaryStreamWriter W2{Second};
return std::make_pair(W1, W2);		return std::make_pair(W1, W2);
}		}

Error BinaryStreamWriter::padToAlignment(uint32_t Align) {		Error BinaryStreamWriter::padToAlignment(uint32_t Align) {
uint32_t NewOffset = alignTo(Offset, Align);		uint64_t NewOffset = alignTo(Offset, Align);
if (NewOffset > getLength())		if (NewOffset > getLength())
return make_error<BinaryStreamError>(stream_error_code::stream_too_short);		return make_error<BinaryStreamError>(stream_error_code::stream_too_short);
while (Offset < NewOffset)		while (Offset < NewOffset)
if (auto EC = writeInteger('\0'))		if (auto EC = writeInteger('\0'))
return EC;		return EC;
return Error::success();		return Error::success();
}		}