1 files changed, 254 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/BinaryFormat/MsgPackReader.cpp b/contrib/llvm-project/llvm/lib/BinaryFormat/MsgPackReader.cpp
new file mode 100644
index 000000000000..872a6e0e29f8
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/BinaryFormat/MsgPackReader.cpp
@@ -0,0 +1,254 @@
+//===- 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;
+}