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//===- MsgPackWriter.cpp - 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 implements a MessagePack writer.
///
//===----------------------------------------------------------------------===//
#include "llvm/BinaryFormat/MsgPackWriter.h"
#include "llvm/BinaryFormat/MsgPack.h"
using namespace llvm;
using namespace msgpack;
Writer::Writer(raw_ostream &OS, bool Compatible)
: EW(OS, Endianness), Compatible(Compatible) {}
void Writer::writeNil() { EW.write(FirstByte::Nil); }
void Writer::write(bool b) { EW.write(b ? FirstByte::True : FirstByte::False); }
void Writer::write(int64_t i) {
if (i >= 0) {
write(static_cast<uint64_t>(i));
return;
}
if (i >= FixMin::NegativeInt) {
EW.write(static_cast<int8_t>(i));
return;
}
if (i >= INT8_MIN) {
EW.write(FirstByte::Int8);
EW.write(static_cast<int8_t>(i));
return;
}
if (i >= INT16_MIN) {
EW.write(FirstByte::Int16);
EW.write(static_cast<int16_t>(i));
return;
}
if (i >= INT32_MIN) {
EW.write(FirstByte::Int32);
EW.write(static_cast<int32_t>(i));
return;
}
EW.write(FirstByte::Int64);
EW.write(i);
}
void Writer::write(uint64_t u) {
if (u <= FixMax::PositiveInt) {
EW.write(static_cast<uint8_t>(u));
return;
}
if (u <= UINT8_MAX) {
EW.write(FirstByte::UInt8);
EW.write(static_cast<uint8_t>(u));
return;
}
if (u <= UINT16_MAX) {
EW.write(FirstByte::UInt16);
EW.write(static_cast<uint16_t>(u));
return;
}
if (u <= UINT32_MAX) {
EW.write(FirstByte::UInt32);
EW.write(static_cast<uint32_t>(u));
return;
}
EW.write(FirstByte::UInt64);
EW.write(u);
}
void Writer::write(double d) {
// If no loss of precision, encode as a Float32.
double a = std::fabs(d);
if (a >= std::numeric_limits<float>::min() &&
a <= std::numeric_limits<float>::max()) {
EW.write(FirstByte::Float32);
EW.write(static_cast<float>(d));
} else {
EW.write(FirstByte::Float64);
EW.write(d);
}
}
void Writer::write(StringRef s) {
size_t Size = s.size();
if (Size <= FixMax::String)
EW.write(static_cast<uint8_t>(FixBits::String | Size));
else if (!Compatible && Size <= UINT8_MAX) {
EW.write(FirstByte::Str8);
EW.write(static_cast<uint8_t>(Size));
} else if (Size <= UINT16_MAX) {
EW.write(FirstByte::Str16);
EW.write(static_cast<uint16_t>(Size));
} else {
assert(Size <= UINT32_MAX && "String object too long to be encoded");
EW.write(FirstByte::Str32);
EW.write(static_cast<uint32_t>(Size));
}
EW.OS << s;
}
void Writer::write(MemoryBufferRef Buffer) {
assert(!Compatible && "Attempt to write Bin format in compatible mode");
size_t Size = Buffer.getBufferSize();
if (Size <= UINT8_MAX) {
EW.write(FirstByte::Bin8);
EW.write(static_cast<uint8_t>(Size));
} else if (Size <= UINT16_MAX) {
EW.write(FirstByte::Bin16);
EW.write(static_cast<uint16_t>(Size));
} else {
assert(Size <= UINT32_MAX && "Binary object too long to be encoded");
EW.write(FirstByte::Bin32);
EW.write(static_cast<uint32_t>(Size));
}
EW.OS.write(Buffer.getBufferStart(), Size);
}
void Writer::writeArraySize(uint32_t Size) {
if (Size <= FixMax::Array) {
EW.write(static_cast<uint8_t>(FixBits::Array | Size));
return;
}
if (Size <= UINT16_MAX) {
EW.write(FirstByte::Array16);
EW.write(static_cast<uint16_t>(Size));
return;
}
EW.write(FirstByte::Array32);
EW.write(Size);
}
void Writer::writeMapSize(uint32_t Size) {
if (Size <= FixMax::Map) {
EW.write(static_cast<uint8_t>(FixBits::Map | Size));
return;
}
if (Size <= UINT16_MAX) {
EW.write(FirstByte::Map16);
EW.write(static_cast<uint16_t>(Size));
return;
}
EW.write(FirstByte::Map32);
EW.write(Size);
}
void Writer::writeExt(int8_t Type, MemoryBufferRef Buffer) {
size_t Size = Buffer.getBufferSize();
switch (Size) {
case FixLen::Ext1:
EW.write(FirstByte::FixExt1);
break;
case FixLen::Ext2:
EW.write(FirstByte::FixExt2);
break;
case FixLen::Ext4:
EW.write(FirstByte::FixExt4);
break;
case FixLen::Ext8:
EW.write(FirstByte::FixExt8);
break;
case FixLen::Ext16:
EW.write(FirstByte::FixExt16);
break;
default:
if (Size <= UINT8_MAX) {
EW.write(FirstByte::Ext8);
EW.write(static_cast<uint8_t>(Size));
} else if (Size <= UINT16_MAX) {
EW.write(FirstByte::Ext16);
EW.write(static_cast<uint16_t>(Size));
} else {
assert(Size <= UINT32_MAX && "Ext size too large to be encoded");
EW.write(FirstByte::Ext32);
EW.write(static_cast<uint32_t>(Size));
}
}
EW.write(Type);
EW.OS.write(Buffer.getBufferStart(), Size);
}
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