StructuredHeadersBuffer.h

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/*
 *  Copyright (c) 2018-present, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 *
 */
#pragma once

#include <string>
#include <folly/Range.h>
#include "StructuredHeadersConstants.h"

namespace proxygen {

using namespace StructuredHeaders;

class StructuredHeadersBuffer {
public:

  explicit StructuredHeadersBuffer(const std::string& s) :
    content_(s),
    originalContent_(s) {}

  /*
   * helper functions used to extract various lower-level items from a sequence
   * of bytes. These will be called from higher level functions which parse
   * dictionaries, lists, and other data structures.
   */

  StructuredHeaders::DecodeError parseIdentifier(StructuredHeaderItem& result);

  StructuredHeaders::DecodeError parseIdentifier(std::string& result);

  StructuredHeaders::DecodeError parseItem(StructuredHeaderItem& result);

  DecodeError removeSymbol(const std::string& symbol, bool strict);

  DecodeError removeOptionalWhitespace();

  bool isEmpty();

  DecodeError handleDecodeError(const DecodeError& err);

private:

  DecodeError parseBinaryContent(StructuredHeaderItem& result);

  DecodeError parseNumber(StructuredHeaderItem& result);

  DecodeError parseString(StructuredHeaderItem& result);

  DecodeError parseInteger(const std::string& input,
    StructuredHeaderItem& result);

  DecodeError parseFloat(const std::string& input,
    StructuredHeaderItem& result);

  char peek();

  void advanceCursor();

  int32_t getNumCharsParsed();

  folly::StringPiece content_;
  folly::StringPiece originalContent_;
};

}