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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_FETCH_MULTIPART_PARSER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_FETCH_MULTIPART_PARSER_H_
#include "base/check_op.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/member.h"
#include "third_party/blink/renderer/platform/network/http_header_map.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
// This class parses a multipart message which is supplied (possible in chunks)
// to MultipartParser::appendData which parses the data and passes resulting
// part header fields and data to Client.
//
// - MultipartParser::appendData does not accept base64, quoted-printable nor
// otherwise transfer encoded multipart message parts (no-op transfer
// encodings "binary", "7bit" and "8bit" are OK).
// - If MultipartParser::cancel() is called, Client's methods will not be
// called anymore.
class CORE_EXPORT MultipartParser final
: public GarbageCollected<MultipartParser> {
public:
// Client recieves parsed part header fields and data.
class CORE_EXPORT Client : public GarbageCollectedMixin {
public:
virtual ~Client() = default;
// The method is called whenever header fields of a part are parsed.
virtual void PartHeaderFieldsInMultipartReceived(
const HTTPHeaderMap& header_fields) = 0;
// The method is called whenever some data of a part is parsed which
// can happen zero or more times per each part. It always holds that
// |size| > 0.
virtual void PartDataInMultipartReceived(base::span<const char> bytes) = 0;
// The method is called whenever all data of a complete part is parsed.
virtual void PartDataInMultipartFullyReceived() = 0;
void Trace(Visitor* visitor) const override {}
};
MultipartParser(Vector<char> boundary, Client*);
MultipartParser(const MultipartParser&) = delete;
MultipartParser& operator=(const MultipartParser&) = delete;
bool AppendData(base::span<const char> bytes);
void Cancel();
bool Finish();
bool IsCancelled() const { return state_ == State::kCancelled; }
void Trace(Visitor*) const;
private:
class Matcher {
DISALLOW_NEW();
public:
Matcher();
Matcher(base::span<const char> match_data, size_t num_matched_bytes);
bool Match(char value) {
if (value != match_data_[num_matched_bytes_]) {
return false;
}
++num_matched_bytes_;
return true;
}
bool Match(base::span<const char> data);
bool IsMatchComplete() const {
return num_matched_bytes_ == match_data_.size();
}
size_t NumMatchedBytes() const { return num_matched_bytes_; }
void SetNumMatchedBytes(size_t);
base::span<const char> MatchedData() const {
return match_data_.first(num_matched_bytes_);
}
private:
base::span<const char> match_data_;
size_t num_matched_bytes_ = 0u;
};
Matcher CloseDelimiterSuffixMatcher() const;
Matcher DelimiterMatcher(size_t num_already_matched_bytes = 0u) const;
Matcher DelimiterSuffixMatcher() const;
void ParseDataAndDelimiter(base::span<const char>& bytes);
void ParseDelimiter(base::span<const char>& bytes);
bool ParseHeaderFields(base::span<const char>& bytes,
HTTPHeaderMap* header_fields);
void ParseTransportPadding(base::span<const char>& bytes) const;
Matcher matcher_;
Vector<char> buffered_header_bytes_;
Member<Client> client_;
Vector<char> delimiter_;
enum class State {
kParsingPreamble,
kParsingDelimiterSuffix,
kParsingPartHeaderFields,
kParsingPartOctets,
kParsingDelimiterOrCloseDelimiterSuffix,
kParsingCloseDelimiterSuffix,
kParsingEpilogue,
kCancelled,
kFinished
} state_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_FETCH_MULTIPART_PARSER_H_
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