| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include <algorithm> |
| #include <string> |
| |
| #include "base/codegen_bytearray_stream.h" |
| #include "base/file_stream.h" |
| #include "base/flags.h" |
| #include "base/logging.h" |
| #include "base/util.h" |
| #include "storage/existence_filter.h" |
| |
| DEFINE_string(input, "", "per-line suggestion filter list"); |
| DEFINE_string(output, "", "output bloom filter"); |
| DEFINE_bool(header, true, |
| "make header file instead of raw bloom filter"); |
| DEFINE_string(name, "SuggestionFilterData", |
| "name for variable name in the header file"); |
| |
| namespace { |
| void ReadWords(const string &name, vector<uint64> *words) { |
| string line; |
| mozc::InputFileStream input(name.c_str()); |
| while (getline(input, line)) { |
| if (line.empty() || line[0] == '#') { |
| continue; |
| } |
| string lower_value = line; |
| mozc::Util::LowerString(&lower_value); |
| words->push_back(mozc::Util::Fingerprint(lower_value)); |
| } |
| } |
| |
| const size_t kMinimumFilterBytes = 100 * 1000; |
| } // namespace |
| |
| using mozc::storage::ExistenceFilter; |
| |
| // read per-line word list and generate |
| // bloom filter in raw byte array or header file format |
| int main(int argc, char **argv) { |
| InitGoogle(argv[0], &argc, &argv, true); |
| |
| if ((FLAGS_input.empty() || |
| FLAGS_output.empty()) && argc > 2) { |
| FLAGS_input = argv[1]; |
| FLAGS_output = argv[2]; |
| } |
| |
| vector<uint64> words; |
| |
| ReadWords(FLAGS_input, &words); |
| |
| LOG(INFO) << words.size() << " words found"; |
| |
| static const float kErrorRate = 0.00001; |
| const size_t num_bytes = max( |
| ExistenceFilter::MinFilterSizeInBytesForErrorRate( |
| kErrorRate, words.size()), |
| kMinimumFilterBytes); |
| |
| LOG(INFO) << "num_bytes: " << num_bytes; |
| |
| scoped_ptr<ExistenceFilter> filter( |
| ExistenceFilter::CreateOptimal(num_bytes, words.size())); |
| for (size_t i = 0; i < words.size(); ++i) { |
| filter->Insert(words[i]); |
| } |
| |
| char *buf = NULL; |
| size_t size = 0; |
| |
| LOG(INFO) << "writing bloomfilter: " << FLAGS_output; |
| filter->Write(&buf, &size); |
| |
| if (FLAGS_header) { |
| mozc::OutputFileStream ofs(FLAGS_output.c_str()); |
| mozc::CodeGenByteArrayOutputStream codegen_stream( |
| &ofs, mozc::codegenstream::NOT_OWN_STREAM); |
| codegen_stream.OpenVarDef(FLAGS_name); |
| codegen_stream.write(buf, size); |
| codegen_stream.CloseVarDef(); |
| } else { |
| mozc::OutputFileStream ofs(FLAGS_output.c_str(), |
| ios::out | ios::trunc | ios::binary); |
| ofs.write(buf, size); |
| } |
| |
| delete [] buf; |
| |
| return 0; |
| } |