ad_block_client.h

/* Copyright (c) 2015 Brian R. Bondy. Distributed under the MPL2 license.
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef AD_BLOCK_CLIENT_H_
#define AD_BLOCK_CLIENT_H_

#include "./filter.h"

class CosmeticFilter;
class BloomFilter;
class BadFingerprintsHashSet;

template<class T>
class HashSet;

class AdBlockClient {
 public:
  AdBlockClient();
  ~AdBlockClient();

  void clear();
  bool parse(const char *input);
  bool matches(const char *input,
      FilterOption contextOption = FONoFilterOption,
      const char *contextDomain = nullptr);
  bool findMatchingFilters(const char *input,
      FilterOption contextOption,
      const char *contextDomain,
      Filter **matchingFilter,
      Filter **matchingExceptionFilter);
  // Serializes a the parsed data and bloom filter data into a single buffer.
  // The returned buffer should be deleted.
  char * serialize(int *size,
      bool ignoreCosmeticFilters = true,
      bool ignoreHtmlFilters = true);
  // Deserializes the buffer, a size is not needed since a serialized.
  // buffer is self described
  bool deserialize(char *buffer);

  void enableBadFingerprintDetection();
  const char * getDeserializedBuffer() {
    return deserializedBuffer;
  }

  Filter *filters;
  Filter *cosmeticFilters;
  Filter *htmlFilters;
  Filter *exceptionFilters;
  Filter *noFingerprintFilters;
  Filter *noFingerprintExceptionFilters;

  int numFilters;
  int numCosmeticFilters;
  int numHtmlFilters;
  int numExceptionFilters;
  int numNoFingerprintFilters;
  int numNoFingerprintExceptionFilters;
  int numHostAnchoredFilters;
  int numHostAnchoredExceptionFilters;

  BloomFilter *bloomFilter;
  BloomFilter *exceptionBloomFilter;
  HashSet<Filter> *hostAnchoredHashSet;
  HashSet<Filter> *hostAnchoredExceptionHashSet;

  // Used only in the perf program to create a list of bad fingerprints
  BadFingerprintsHashSet *badFingerprintsHashSet;

  // Stats kept for matching
  unsigned int numFalsePositives;
  unsigned int numExceptionFalsePositives;
  unsigned int numBloomFilterSaves;
  unsigned int numExceptionBloomFilterSaves;
  unsigned int numHashSetSaves;
  unsigned int numExceptionHashSetSaves;

 protected:
  // Determines if a passed in array of filter pointers matches for any of
  // the input
  bool hasMatchingFilters(Filter *filter, int numFilters, const char *input,
      int inputLen, FilterOption contextOption, const char *contextDomain,
      BloomFilter *inputBloomFilter, const char *inputHost, int inputHostLen,
      Filter **matchingFilter = nullptr);
  void initBloomFilter(BloomFilter**, const char *buffer, int len);
  bool initHashSet(HashSet<Filter>**, char *buffer, int len);
  char *deserializedBuffer;
};

extern const char *separatorCharacters;
void parseFilter(const char *input, const char *end, Filter *f,
    BloomFilter *bloomFilter = nullptr,
    BloomFilter *exceptionBloomFilter = nullptr,
    HashSet<Filter> *hostAnchoredHashSet = nullptr,
    HashSet<Filter> *hostAnchoredExceptionHashSet = nullptr,
    HashSet<CosmeticFilter> *simpleCosmeticFilters = nullptr);
void parseFilter(const char *input, Filter *f,
    BloomFilter *bloomFilter = nullptr,
    BloomFilter *exceptionBloomFilter = nullptr,
    HashSet<Filter> *hostAnchoredHashSet = nullptr,
    HashSet<Filter> *hostAnchoredExceptionHashSet = nullptr,
    HashSet<CosmeticFilter> *simpleCosmeticFilters = nullptr);
bool isSeparatorChar(char c);
int findFirstSeparatorChar(const char *input, const char *end);

#endif  // AD_BLOCK_CLIENT_H_