Function initStream

src/lib/Bitcode/Reader/BitcodeReader.cpp:123–141

}

static Expected<BitstreamCursor> initStream(MemoryBufferRef Buffer) {
  const unsigned char *BufPtr = (const unsigned char *)Buffer.getBufferStart();
  const unsigned char *BufEnd = BufPtr + Buffer.getBufferSize();

  if (Buffer.getBufferSize() & 3)
    return error("Invalid bitcode signature");

  // If we have a wrapper header, parse it and ignore the non-bc file contents.
  // The magic number is 0x0B17C0DE stored in little endian.
  if (isBitcodeWrapper(BufPtr, BufEnd))
    if (SkipBitcodeWrapperHeader(BufPtr, BufEnd, true))
      return error("Invalid bitcode wrapper header");

  BitstreamCursor Stream(ArrayRef<uint8_t>(BufPtr, BufEnd));
  if (!hasValidBitcodeHeader(Stream))
    return error("Invalid bitcode signature");

  return std::move(Stream);
}

/// Convert a string from a record into an std::string, return true on failure.
template <typename StrTy>