Imported Upstream version 5.18.0.247

Former-commit-id: 2d6af2e4ed0eda5cbdc2946446ef7718456ad190

external/llvm/lib/Support/BinaryStreamReader.cpp

@@ -1,149 +0,0 @@
-//===- BinaryStreamReader.cpp - Reads objects from a binary stream --------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Support/BinaryStreamReader.h"
-
-#include "llvm/Support/BinaryStreamError.h"
-#include "llvm/Support/BinaryStreamRef.h"
-
-using namespace llvm;
-using endianness = llvm::support::endianness;
-
-BinaryStreamReader::BinaryStreamReader(BinaryStreamRef Ref) : Stream(Ref) {}
-
-BinaryStreamReader::BinaryStreamReader(BinaryStream &Stream) : Stream(Stream) {}
-
-BinaryStreamReader::BinaryStreamReader(ArrayRef<uint8_t> Data,
-                                       endianness Endian)
-    : Stream(Data, Endian) {}
-
-BinaryStreamReader::BinaryStreamReader(StringRef Data, endianness Endian)
-    : Stream(Data, Endian) {}
-
-Error BinaryStreamReader::readLongestContiguousChunk(
-    ArrayRef<uint8_t> &Buffer) {
-  if (auto EC = Stream.readLongestContiguousChunk(Offset, Buffer))
-    return EC;
-  Offset += Buffer.size();
-  return Error::success();
-}
-
-Error BinaryStreamReader::readBytes(ArrayRef<uint8_t> &Buffer, uint32_t Size) {
-  if (auto EC = Stream.readBytes(Offset, Size, Buffer))
-    return EC;
-  Offset += Size;
-  return Error::success();
-}
-
-Error BinaryStreamReader::readCString(StringRef &Dest) {
-  uint32_t OriginalOffset = getOffset();
-  uint32_t FoundOffset = 0;
-  while (true) {
-    uint32_t ThisOffset = getOffset();
-    ArrayRef<uint8_t> Buffer;
-    if (auto EC = readLongestContiguousChunk(Buffer))
-      return EC;
-    StringRef S(reinterpret_cast<const char *>(Buffer.begin()), Buffer.size());
-    size_t Pos = S.find_first_of('\0');
-    if (LLVM_LIKELY(Pos != StringRef::npos)) {
-      FoundOffset = Pos + ThisOffset;
-      break;
-    }
-  }
-  assert(FoundOffset >= OriginalOffset);
-
-  setOffset(OriginalOffset);
-  size_t Length = FoundOffset - OriginalOffset;
-
-  if (auto EC = readFixedString(Dest, Length))
-    return EC;
-
-  // Now set the offset back to after the null terminator.
-  setOffset(FoundOffset + 1);
-  return Error::success();
-}
-
-Error BinaryStreamReader::readWideString(ArrayRef<UTF16> &Dest) {
-  uint32_t Length = 0;
-  uint32_t OriginalOffset = getOffset();
-  const UTF16 *C;
-  while (true) {
-    if (auto EC = readObject(C))
-      return EC;
-    if (*C == 0x0000)
-      break;
-    ++Length;
-  }
-  uint32_t NewOffset = getOffset();
-  setOffset(OriginalOffset);
-
-  if (auto EC = readArray(Dest, Length))
-    return EC;
-  setOffset(NewOffset);
-  return Error::success();
-}
-
-Error BinaryStreamReader::readFixedString(StringRef &Dest, uint32_t Length) {
-  ArrayRef<uint8_t> Bytes;
-  if (auto EC = readBytes(Bytes, Length))
-    return EC;
-  Dest = StringRef(reinterpret_cast<const char *>(Bytes.begin()), Bytes.size());
-  return Error::success();
-}
-
-Error BinaryStreamReader::readStreamRef(BinaryStreamRef &Ref) {
-  return readStreamRef(Ref, bytesRemaining());
-}
-
-Error BinaryStreamReader::readStreamRef(BinaryStreamRef &Ref, uint32_t Length) {
-  if (bytesRemaining() < Length)
-    return make_error<BinaryStreamError>(stream_error_code::stream_too_short);
-  Ref = Stream.slice(Offset, Length);
-  Offset += Length;
-  return Error::success();
-}
-
-Error BinaryStreamReader::readSubstream(BinarySubstreamRef &Stream,
-                                        uint32_t Size) {
-  Stream.Offset = getOffset();
-  return readStreamRef(Stream.StreamData, Size);
-}
-
-Error BinaryStreamReader::skip(uint32_t Amount) {
-  if (Amount > bytesRemaining())
-    return make_error<BinaryStreamError>(stream_error_code::stream_too_short);
-  Offset += Amount;
-  return Error::success();
-}
-
-Error BinaryStreamReader::padToAlignment(uint32_t Align) {
-  uint32_t NewOffset = alignTo(Offset, Align);
-  return skip(NewOffset - Offset);
-}
-
-uint8_t BinaryStreamReader::peek() const {
-  ArrayRef<uint8_t> Buffer;
-  auto EC = Stream.readBytes(Offset, 1, Buffer);
-  assert(!EC && "Cannot peek an empty buffer!");
-  llvm::consumeError(std::move(EC));
-  return Buffer[0];
-}
-
-std::pair<BinaryStreamReader, BinaryStreamReader>
-BinaryStreamReader::split(uint32_t Off) const {
-  assert(getLength() >= Off);
-
-  BinaryStreamRef First = Stream.drop_front(Offset);
-
-  BinaryStreamRef Second = First.drop_front(Off);
-  First = First.keep_front(Off);
-  BinaryStreamReader W1{First};
-  BinaryStreamReader W2{Second};
-  return std::make_pair(W1, W2);
-}