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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
255 lines
7.8 KiB
C++
255 lines
7.8 KiB
C++
//===- MsgPackReader.cpp - Simple MsgPack reader ----------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file implements a MessagePack reader.
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///
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//===----------------------------------------------------------------------===//
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#include "llvm/BinaryFormat/MsgPackReader.h"
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#include "llvm/BinaryFormat/MsgPack.h"
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#include "llvm/Support/Endian.h"
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using namespace llvm;
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using namespace llvm::support;
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using namespace msgpack;
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Reader::Reader(MemoryBufferRef InputBuffer)
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: InputBuffer(InputBuffer), Current(InputBuffer.getBufferStart()),
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End(InputBuffer.getBufferEnd()) {}
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Reader::Reader(StringRef Input) : Reader({Input, "MsgPack"}) {}
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Expected<bool> Reader::read(Object &Obj) {
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if (Current == End)
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return false;
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uint8_t FB = static_cast<uint8_t>(*Current++);
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switch (FB) {
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case FirstByte::Nil:
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Obj.Kind = Type::Nil;
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return true;
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case FirstByte::True:
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Obj.Kind = Type::Boolean;
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Obj.Bool = true;
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return true;
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case FirstByte::False:
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Obj.Kind = Type::Boolean;
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Obj.Bool = false;
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return true;
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case FirstByte::Int8:
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Obj.Kind = Type::Int;
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return readInt<int8_t>(Obj);
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case FirstByte::Int16:
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Obj.Kind = Type::Int;
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return readInt<int16_t>(Obj);
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case FirstByte::Int32:
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Obj.Kind = Type::Int;
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return readInt<int32_t>(Obj);
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case FirstByte::Int64:
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Obj.Kind = Type::Int;
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return readInt<int64_t>(Obj);
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case FirstByte::UInt8:
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Obj.Kind = Type::UInt;
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return readUInt<uint8_t>(Obj);
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case FirstByte::UInt16:
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Obj.Kind = Type::UInt;
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return readUInt<uint16_t>(Obj);
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case FirstByte::UInt32:
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Obj.Kind = Type::UInt;
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return readUInt<uint32_t>(Obj);
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case FirstByte::UInt64:
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Obj.Kind = Type::UInt;
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return readUInt<uint64_t>(Obj);
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case FirstByte::Float32:
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Obj.Kind = Type::Float;
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if (sizeof(float) > remainingSpace())
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return make_error<StringError>(
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"Invalid Float32 with insufficient payload",
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std::make_error_code(std::errc::invalid_argument));
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Obj.Float = BitsToFloat(endian::read<uint32_t, Endianness>(Current));
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Current += sizeof(float);
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return true;
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case FirstByte::Float64:
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Obj.Kind = Type::Float;
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if (sizeof(double) > remainingSpace())
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return make_error<StringError>(
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"Invalid Float64 with insufficient payload",
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std::make_error_code(std::errc::invalid_argument));
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Obj.Float = BitsToDouble(endian::read<uint64_t, Endianness>(Current));
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Current += sizeof(double);
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return true;
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case FirstByte::Str8:
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Obj.Kind = Type::String;
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return readRaw<uint8_t>(Obj);
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case FirstByte::Str16:
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Obj.Kind = Type::String;
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return readRaw<uint16_t>(Obj);
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case FirstByte::Str32:
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Obj.Kind = Type::String;
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return readRaw<uint32_t>(Obj);
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case FirstByte::Bin8:
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Obj.Kind = Type::Binary;
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return readRaw<uint8_t>(Obj);
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case FirstByte::Bin16:
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Obj.Kind = Type::Binary;
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return readRaw<uint16_t>(Obj);
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case FirstByte::Bin32:
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Obj.Kind = Type::Binary;
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return readRaw<uint32_t>(Obj);
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case FirstByte::Array16:
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Obj.Kind = Type::Array;
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return readLength<uint16_t>(Obj);
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case FirstByte::Array32:
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Obj.Kind = Type::Array;
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return readLength<uint32_t>(Obj);
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case FirstByte::Map16:
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Obj.Kind = Type::Map;
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return readLength<uint16_t>(Obj);
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case FirstByte::Map32:
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Obj.Kind = Type::Map;
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return readLength<uint32_t>(Obj);
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case FirstByte::FixExt1:
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Obj.Kind = Type::Extension;
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return createExt(Obj, FixLen::Ext1);
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case FirstByte::FixExt2:
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Obj.Kind = Type::Extension;
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return createExt(Obj, FixLen::Ext2);
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case FirstByte::FixExt4:
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Obj.Kind = Type::Extension;
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return createExt(Obj, FixLen::Ext4);
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case FirstByte::FixExt8:
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Obj.Kind = Type::Extension;
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return createExt(Obj, FixLen::Ext8);
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case FirstByte::FixExt16:
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Obj.Kind = Type::Extension;
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return createExt(Obj, FixLen::Ext16);
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case FirstByte::Ext8:
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Obj.Kind = Type::Extension;
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return readExt<uint8_t>(Obj);
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case FirstByte::Ext16:
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Obj.Kind = Type::Extension;
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return readExt<uint16_t>(Obj);
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case FirstByte::Ext32:
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Obj.Kind = Type::Extension;
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return readExt<uint32_t>(Obj);
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}
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if ((FB & FixBitsMask::NegativeInt) == FixBits::NegativeInt) {
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Obj.Kind = Type::Int;
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int8_t I;
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static_assert(sizeof(I) == sizeof(FB), "Unexpected type sizes");
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memcpy(&I, &FB, sizeof(FB));
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Obj.Int = I;
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return true;
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}
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if ((FB & FixBitsMask::PositiveInt) == FixBits::PositiveInt) {
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Obj.Kind = Type::UInt;
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Obj.UInt = FB;
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return true;
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}
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if ((FB & FixBitsMask::String) == FixBits::String) {
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Obj.Kind = Type::String;
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uint8_t Size = FB & ~FixBitsMask::String;
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return createRaw(Obj, Size);
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}
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if ((FB & FixBitsMask::Array) == FixBits::Array) {
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Obj.Kind = Type::Array;
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Obj.Length = FB & ~FixBitsMask::Array;
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return true;
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}
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if ((FB & FixBitsMask::Map) == FixBits::Map) {
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Obj.Kind = Type::Map;
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Obj.Length = FB & ~FixBitsMask::Map;
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return true;
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}
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return make_error<StringError>(
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"Invalid first byte", std::make_error_code(std::errc::invalid_argument));
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}
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template <class T> Expected<bool> Reader::readRaw(Object &Obj) {
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if (sizeof(T) > remainingSpace())
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return make_error<StringError>(
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"Invalid Raw with insufficient payload",
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std::make_error_code(std::errc::invalid_argument));
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T Size = endian::read<T, Endianness>(Current);
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Current += sizeof(T);
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return createRaw(Obj, Size);
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}
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template <class T> Expected<bool> Reader::readInt(Object &Obj) {
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if (sizeof(T) > remainingSpace())
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return make_error<StringError>(
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"Invalid Int with insufficient payload",
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std::make_error_code(std::errc::invalid_argument));
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Obj.Int = static_cast<int64_t>(endian::read<T, Endianness>(Current));
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Current += sizeof(T);
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return true;
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}
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template <class T> Expected<bool> Reader::readUInt(Object &Obj) {
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if (sizeof(T) > remainingSpace())
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return make_error<StringError>(
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"Invalid Int with insufficient payload",
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std::make_error_code(std::errc::invalid_argument));
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Obj.UInt = static_cast<uint64_t>(endian::read<T, Endianness>(Current));
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Current += sizeof(T);
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return true;
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}
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template <class T> Expected<bool> Reader::readLength(Object &Obj) {
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if (sizeof(T) > remainingSpace())
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return make_error<StringError>(
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"Invalid Map/Array with invalid length",
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std::make_error_code(std::errc::invalid_argument));
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Obj.Length = static_cast<size_t>(endian::read<T, Endianness>(Current));
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Current += sizeof(T);
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return true;
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}
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template <class T> Expected<bool> Reader::readExt(Object &Obj) {
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if (sizeof(T) > remainingSpace())
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return make_error<StringError>(
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"Invalid Ext with invalid length",
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std::make_error_code(std::errc::invalid_argument));
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T Size = endian::read<T, Endianness>(Current);
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Current += sizeof(T);
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return createExt(Obj, Size);
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}
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Expected<bool> Reader::createRaw(Object &Obj, uint32_t Size) {
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if (Size > remainingSpace())
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return make_error<StringError>(
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"Invalid Raw with insufficient payload",
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std::make_error_code(std::errc::invalid_argument));
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Obj.Raw = StringRef(Current, Size);
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Current += Size;
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return true;
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}
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Expected<bool> Reader::createExt(Object &Obj, uint32_t Size) {
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if (Current == End)
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return make_error<StringError>(
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"Invalid Ext with no type",
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std::make_error_code(std::errc::invalid_argument));
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Obj.Extension.Type = *Current++;
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if (Size > remainingSpace())
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return make_error<StringError>(
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"Invalid Ext with insufficient payload",
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std::make_error_code(std::errc::invalid_argument));
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Obj.Extension.Bytes = StringRef(Current, Size);
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Current += Size;
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return true;
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}
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