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//===- MsgPackWriter.h - Simple MsgPack writer ------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file contains a MessagePack writer.
///
/// See https://github.com/msgpack/msgpack/blob/master/spec.md for the full
/// specification.
///
/// Typical usage:
/// \code
/// raw_ostream output = GetOutputStream();
/// msgpack::Writer MPWriter(output);
/// MPWriter.writeNil();
/// MPWriter.write(false);
/// MPWriter.write("string");
/// // ...
/// \endcode
///
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_BINARYFORMAT_MSGPACKWRITER_H
#define LLVM_BINARYFORMAT_MSGPACKWRITER_H
#include "llvm/Support/EndianStream.h"
#include "llvm/Support/MemoryBufferRef.h"
namespace llvm {
class raw_ostream;
namespace msgpack {
/// Writes MessagePack objects to an output stream, one at a time.
class Writer {
public:
/// Construct a writer, optionally enabling "Compatibility Mode" as defined
/// in the MessagePack specification.
///
/// When in \p Compatible mode, the writer will write \c Str16 formats
/// instead of \c Str8 formats, and will refuse to write any \c Bin formats.
///
/// \param OS stream to output MessagePack objects to.
/// \param Compatible when set, write in "Compatibility Mode".
Writer(raw_ostream &OS, bool Compatible = false);
Writer(const Writer &) = delete;
Writer &operator=(const Writer &) = delete;
/// Write a \em Nil to the output stream.
///
/// The output will be the \em nil format.
void writeNil();
/// Write a \em Boolean to the output stream.
///
/// The output will be a \em bool format.
void write(bool b);
/// Write a signed integer to the output stream.
///
/// The output will be in the smallest possible \em int format.
///
/// The format chosen may be for an unsigned integer.
void write(int64_t i);
/// Write an unsigned integer to the output stream.
///
/// The output will be in the smallest possible \em int format.
void write(uint64_t u);
/// Write a floating point number to the output stream.
///
/// The output will be in the smallest possible \em float format.
void write(double d);
/// Write a string to the output stream.
///
/// The output will be in the smallest possible \em str format.
void write(StringRef s);
/// Write a memory buffer to the output stream.
///
/// The output will be in the smallest possible \em bin format.
///
/// \warning Do not use this overload if in \c Compatible mode.
void write(MemoryBufferRef Buffer);
/// Write the header for an \em Array of the given size.
///
/// The output will be in the smallest possible \em array format.
//
/// The header contains an identifier for the \em array format used, as well
/// as an encoding of the size of the array.
///
/// N.B. The caller must subsequently call \c Write an additional \p Size
/// times to complete the array.
void writeArraySize(uint32_t Size);
/// Write the header for a \em Map of the given size.
///
/// The output will be in the smallest possible \em map format.
//
/// The header contains an identifier for the \em map format used, as well
/// as an encoding of the size of the map.
///
/// N.B. The caller must subsequently call \c Write and additional \c Size*2
/// times to complete the map. Each even numbered call to \c Write defines a
/// new key, and each odd numbered call defines the previous key's value.
void writeMapSize(uint32_t Size);
/// Write a typed memory buffer (an extension type) to the output stream.
///
/// The output will be in the smallest possible \em ext format.
void writeExt(int8_t Type, MemoryBufferRef Buffer);
private:
support::endian::Writer EW;
bool Compatible;
};
} // end namespace msgpack
} // end namespace llvm
#endif // LLVM_BINARYFORMAT_MSGPACKWRITER_H
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