| // Copyright 2010-2014, 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 "dictionary/file/codec.h" |
| |
| #include <algorithm> |
| #include <climits> |
| |
| #include "base/file_stream.h" |
| #include "base/logging.h" |
| #include "base/port.h" |
| #include "base/singleton.h" |
| #include "base/util.h" |
| #include "dictionary/file/codec_interface.h" |
| #include "dictionary/file/section.h" |
| |
| |
| namespace mozc { |
| namespace { |
| |
| void WriteInt(int value, ostream *ofs) { |
| DCHECK(ofs); |
| ofs->write(reinterpret_cast<const char *>(&value), sizeof(value)); |
| } |
| |
| int ReadInt(const char *ptr) { |
| DCHECK(ptr); |
| return *reinterpret_cast<const int *>(ptr); |
| } |
| |
| // Round up |
| int Rup4(int length) { |
| const int rem = (length % 4); |
| return ((4 - rem) % 4); |
| } |
| |
| } // namespace |
| |
| |
| DictionaryFileCodec::DictionaryFileCodec() : filemagic_(20110701) {} |
| |
| DictionaryFileCodec::~DictionaryFileCodec() {} |
| |
| void DictionaryFileCodec::WriteSections( |
| const vector<DictionaryFileSection> §ions, |
| ostream *ofs) const { |
| DCHECK(ofs); |
| WriteHeader(ofs); |
| for (size_t i = 0; i < sections.size(); ++i) { |
| WriteSection(sections[i], ofs); |
| } |
| WriteInt(0, ofs); |
| } |
| |
| void DictionaryFileCodec::WriteHeader(ostream *ofs) const { |
| DCHECK(ofs); |
| WriteInt(filemagic_, ofs); |
| } |
| |
| void DictionaryFileCodec::WriteSection( |
| const DictionaryFileSection §ion, ostream *ofs) const { |
| DCHECK(ofs); |
| const string &name = GetSectionName(section.name); |
| VLOG(1) << "section=" << name << " length=" << section.len; |
| WriteInt(section.len, ofs); |
| |
| const int name_len = name.size() + 1; // including '\0' |
| ofs->write(name.data(), name_len); |
| Pad4(name_len, ofs); |
| |
| ofs->write(section.ptr, section.len); |
| Pad4(section.len, ofs); |
| } |
| |
| string DictionaryFileCodec::GetSectionName(const string &name) const { |
| // Use the given string as is |
| return name; |
| } |
| |
| bool DictionaryFileCodec::ReadSections( |
| const char *image, int length, |
| vector<DictionaryFileSection> *sections) const { |
| DCHECK(sections); |
| const char *ptr = image; |
| const int filemagic = ReadInt(ptr); |
| CHECK(filemagic == filemagic_) << |
| "invalid dictionary file magic (recompile dictionary?)"; |
| ptr += sizeof(filemagic); |
| |
| int size; |
| while ((size = ReadInt(ptr))) { |
| ptr += sizeof(size); |
| const string name(ptr); |
| VLOG(1) << "section=" << name << " length=" << size; |
| const int name_len = name.size() + 1; |
| ptr += name_len; |
| ptr += Rup4(name_len); |
| |
| sections->push_back(DictionaryFileSection(ptr, size, name)); |
| |
| ptr += size; |
| ptr += Rup4(size); |
| if (image + length < ptr) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // Write padding |
| void DictionaryFileCodec::Pad4(int length, ostream *ofs) { |
| DCHECK(ofs); |
| for (int i = length; (i % 4) != 0; ++i) { |
| (*ofs) << static_cast<char>(Util::Random(CHAR_MAX)); |
| } |
| } |
| |
| namespace { |
| DictionaryFileCodecInterface *g_dictionary_file_codec = NULL; |
| } // namespace |
| |
| typedef DictionaryFileCodec DefaultCodec; |
| |
| DictionaryFileCodecInterface *DictionaryFileCodecFactory::GetCodec() { |
| if (g_dictionary_file_codec == NULL) { |
| return Singleton<DefaultCodec>::get(); |
| } else { |
| return g_dictionary_file_codec; |
| } |
| } |
| |
| void DictionaryFileCodecFactory::SetCodec(DictionaryFileCodecInterface *codec) { |
| g_dictionary_file_codec = codec; |
| } |
| |
| } // namespace mozc |