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//===- MsgPackReader.cpp - Simple MsgPack reader ----------------*- 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 reader.
///
//===----------------------------------------------------------------------===//
#include "llvm/BinaryFormat/MsgPackReader.h"
#include "llvm/BinaryFormat/MsgPack.h"
#include "llvm/Support/Endian.h"
using namespace llvm;
using namespace llvm::support;
using namespace msgpack;
Reader::Reader(MemoryBufferRef InputBuffer)
: InputBuffer(InputBuffer), Current(InputBuffer.getBufferStart()),
End(InputBuffer.getBufferEnd()) {}
Reader::Reader(StringRef Input) : Reader({Input, "MsgPack"}) {}
Expected<bool> Reader::read(Object &Obj) {
if (Current == End)
return false;
uint8_t FB = static_cast<uint8_t>(*Current++);
switch (FB) {
case FirstByte::Nil:
Obj.Kind = Type::Nil;
return true;
case FirstByte::True:
Obj.Kind = Type::Boolean;
Obj.Bool = true;
return true;
case FirstByte::False:
Obj.Kind = Type::Boolean;
Obj.Bool = false;
return true;
case FirstByte::Int8:
Obj.Kind = Type::Int;
return readInt<int8_t>(Obj);
case FirstByte::Int16:
Obj.Kind = Type::Int;
return readInt<int16_t>(Obj);
case FirstByte::Int32:
Obj.Kind = Type::Int;
return readInt<int32_t>(Obj);
case FirstByte::Int64:
Obj.Kind = Type::Int;
return readInt<int64_t>(Obj);
case FirstByte::UInt8:
Obj.Kind = Type::UInt;
return readUInt<uint8_t>(Obj);
case FirstByte::UInt16:
Obj.Kind = Type::UInt;
return readUInt<uint16_t>(Obj);
case FirstByte::UInt32:
Obj.Kind = Type::UInt;
return readUInt<uint32_t>(Obj);
case FirstByte::UInt64:
Obj.Kind = Type::UInt;
return readUInt<uint64_t>(Obj);
case FirstByte::Float32:
Obj.Kind = Type::Float;
if (sizeof(float) > remainingSpace())
return make_error<StringError>(
"Invalid Float32 with insufficient payload",
std::make_error_code(std::errc::invalid_argument));
Obj.Float = BitsToFloat(endian::read<uint32_t, Endianness>(Current));
Current += sizeof(float);
return true;
case FirstByte::Float64:
Obj.Kind = Type::Float;
if (sizeof(double) > remainingSpace())
return make_error<StringError>(
"Invalid Float64 with insufficient payload",
std::make_error_code(std::errc::invalid_argument));
Obj.Float = BitsToDouble(endian::read<uint64_t, Endianness>(Current));
Current += sizeof(double);
return true;
case FirstByte::Str8:
Obj.Kind = Type::String;
return readRaw<uint8_t>(Obj);
case FirstByte::Str16:
Obj.Kind = Type::String;
return readRaw<uint16_t>(Obj);
case FirstByte::Str32:
Obj.Kind = Type::String;
return readRaw<uint32_t>(Obj);
case FirstByte::Bin8:
Obj.Kind = Type::Binary;
return readRaw<uint8_t>(Obj);
case FirstByte::Bin16:
Obj.Kind = Type::Binary;
return readRaw<uint16_t>(Obj);
case FirstByte::Bin32:
Obj.Kind = Type::Binary;
return readRaw<uint32_t>(Obj);
case FirstByte::Array16:
Obj.Kind = Type::Array;
return readLength<uint16_t>(Obj);
case FirstByte::Array32:
Obj.Kind = Type::Array;
return readLength<uint32_t>(Obj);
case FirstByte::Map16:
Obj.Kind = Type::Map;
return readLength<uint16_t>(Obj);
case FirstByte::Map32:
Obj.Kind = Type::Map;
return readLength<uint32_t>(Obj);
case FirstByte::FixExt1:
Obj.Kind = Type::Extension;
return createExt(Obj, FixLen::Ext1);
case FirstByte::FixExt2:
Obj.Kind = Type::Extension;
return createExt(Obj, FixLen::Ext2);
case FirstByte::FixExt4:
Obj.Kind = Type::Extension;
return createExt(Obj, FixLen::Ext4);
case FirstByte::FixExt8:
Obj.Kind = Type::Extension;
return createExt(Obj, FixLen::Ext8);
case FirstByte::FixExt16:
Obj.Kind = Type::Extension;
return createExt(Obj, FixLen::Ext16);
case FirstByte::Ext8:
Obj.Kind = Type::Extension;
return readExt<uint8_t>(Obj);
case FirstByte::Ext16:
Obj.Kind = Type::Extension;
return readExt<uint16_t>(Obj);
case FirstByte::Ext32:
Obj.Kind = Type::Extension;
return readExt<uint32_t>(Obj);
}
if ((FB & FixBitsMask::NegativeInt) == FixBits::NegativeInt) {
Obj.Kind = Type::Int;
int8_t I;
static_assert(sizeof(I) == sizeof(FB), "Unexpected type sizes");
memcpy(&I, &FB, sizeof(FB));
Obj.Int = I;
return true;
}
if ((FB & FixBitsMask::PositiveInt) == FixBits::PositiveInt) {
Obj.Kind = Type::UInt;
Obj.UInt = FB;
return true;
}
if ((FB & FixBitsMask::String) == FixBits::String) {
Obj.Kind = Type::String;
uint8_t Size = FB & ~FixBitsMask::String;
return createRaw(Obj, Size);
}
if ((FB & FixBitsMask::Array) == FixBits::Array) {
Obj.Kind = Type::Array;
Obj.Length = FB & ~FixBitsMask::Array;
return true;
}
if ((FB & FixBitsMask::Map) == FixBits::Map) {
Obj.Kind = Type::Map;
Obj.Length = FB & ~FixBitsMask::Map;
return true;
}
return make_error<StringError>(
"Invalid first byte", std::make_error_code(std::errc::invalid_argument));
}
template <class T> Expected<bool> Reader::readRaw(Object &Obj) {
if (sizeof(T) > remainingSpace())
return make_error<StringError>(
"Invalid Raw with insufficient payload",
std::make_error_code(std::errc::invalid_argument));
T Size = endian::read<T, Endianness>(Current);
Current += sizeof(T);
return createRaw(Obj, Size);
}
template <class T> Expected<bool> Reader::readInt(Object &Obj) {
if (sizeof(T) > remainingSpace())
return make_error<StringError>(
"Invalid Int with insufficient payload",
std::make_error_code(std::errc::invalid_argument));
Obj.Int = static_cast<int64_t>(endian::read<T, Endianness>(Current));
Current += sizeof(T);
return true;
}
template <class T> Expected<bool> Reader::readUInt(Object &Obj) {
if (sizeof(T) > remainingSpace())
return make_error<StringError>(
"Invalid Int with insufficient payload",
std::make_error_code(std::errc::invalid_argument));
Obj.UInt = static_cast<uint64_t>(endian::read<T, Endianness>(Current));
Current += sizeof(T);
return true;
}
template <class T> Expected<bool> Reader::readLength(Object &Obj) {
if (sizeof(T) > remainingSpace())
return make_error<StringError>(
"Invalid Map/Array with invalid length",
std::make_error_code(std::errc::invalid_argument));
Obj.Length = static_cast<size_t>(endian::read<T, Endianness>(Current));
Current += sizeof(T);
return true;
}
template <class T> Expected<bool> Reader::readExt(Object &Obj) {
if (sizeof(T) > remainingSpace())
return make_error<StringError>(
"Invalid Ext with invalid length",
std::make_error_code(std::errc::invalid_argument));
T Size = endian::read<T, Endianness>(Current);
Current += sizeof(T);
return createExt(Obj, Size);
}
Expected<bool> Reader::createRaw(Object &Obj, uint32_t Size) {
if (Size > remainingSpace())
return make_error<StringError>(
"Invalid Raw with insufficient payload",
std::make_error_code(std::errc::invalid_argument));
Obj.Raw = StringRef(Current, Size);
Current += Size;
return true;
}
Expected<bool> Reader::createExt(Object &Obj, uint32_t Size) {
if (Current == End)
return make_error<StringError>(
"Invalid Ext with no type",
std::make_error_code(std::errc::invalid_argument));
Obj.Extension.Type = *Current++;
if (Size > remainingSpace())
return make_error<StringError>(
"Invalid Ext with insufficient payload",
std::make_error_code(std::errc::invalid_argument));
Obj.Extension.Bytes = StringRef(Current, Size);
Current += Size;
return true;
}
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