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      1 // Protocol Buffers - Google's data interchange format
      2 // Copyright 2008 Google Inc.  All rights reserved.
      3 // https://developers.google.com/protocol-buffers/
      4 //
      5 // Redistribution and use in source and binary forms, with or without
      6 // modification, are permitted provided that the following conditions are
      7 // met:
      8 //
      9 //     * Redistributions of source code must retain the above copyright
     10 // notice, this list of conditions and the following disclaimer.
     11 //     * Redistributions in binary form must reproduce the above
     12 // copyright notice, this list of conditions and the following disclaimer
     13 // in the documentation and/or other materials provided with the
     14 // distribution.
     15 //     * Neither the name of Google Inc. nor the names of its
     16 // contributors may be used to endorse or promote products derived from
     17 // this software without specific prior written permission.
     18 //
     19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30 
     31 // Author: kenton (at) google.com (Kenton Varda)
     32 //  Based on original Protocol Buffers design by
     33 //  Sanjay Ghemawat, Jeff Dean, and others.
     34 
     35 #include <google/protobuf/unknown_field_set.h>
     36 
     37 #include <google/protobuf/stubs/common.h>
     38 #include <google/protobuf/io/coded_stream.h>
     39 #include <google/protobuf/io/zero_copy_stream.h>
     40 #include <google/protobuf/io/zero_copy_stream_impl.h>
     41 #include <google/protobuf/wire_format.h>
     42 #include <google/protobuf/stubs/stl_util.h>
     43 
     44 namespace google {
     45 namespace protobuf {
     46 
     47 UnknownFieldSet::UnknownFieldSet()
     48     : fields_(NULL) {}
     49 
     50 UnknownFieldSet::~UnknownFieldSet() {
     51   Clear();
     52   delete fields_;
     53 }
     54 
     55 void UnknownFieldSet::ClearFallback() {
     56   GOOGLE_DCHECK(fields_ != NULL);
     57   for (int i = 0; i < fields_->size(); i++) {
     58     (*fields_)[i].Delete();
     59   }
     60   fields_->clear();
     61 }
     62 
     63 void UnknownFieldSet::ClearAndFreeMemory() {
     64   if (fields_ != NULL) {
     65     Clear();
     66     delete fields_;
     67     fields_ = NULL;
     68   }
     69 }
     70 
     71 void UnknownFieldSet::MergeFrom(const UnknownFieldSet& other) {
     72   for (int i = 0; i < other.field_count(); i++) {
     73     AddField(other.field(i));
     74   }
     75 }
     76 
     77 int UnknownFieldSet::SpaceUsedExcludingSelf() const {
     78   if (fields_ == NULL) return 0;
     79 
     80   int total_size = sizeof(*fields_) + sizeof(UnknownField) * fields_->size();
     81   for (int i = 0; i < fields_->size(); i++) {
     82     const UnknownField& field = (*fields_)[i];
     83     switch (field.type()) {
     84       case UnknownField::TYPE_LENGTH_DELIMITED:
     85         total_size += sizeof(*field.length_delimited_.string_value_) +
     86                       internal::StringSpaceUsedExcludingSelf(
     87                           *field.length_delimited_.string_value_);
     88         break;
     89       case UnknownField::TYPE_GROUP:
     90         total_size += field.group_->SpaceUsed();
     91         break;
     92       default:
     93         break;
     94     }
     95   }
     96   return total_size;
     97 }
     98 
     99 int UnknownFieldSet::SpaceUsed() const {
    100   return sizeof(*this) + SpaceUsedExcludingSelf();
    101 }
    102 
    103 void UnknownFieldSet::AddVarint(int number, uint64 value) {
    104   if (fields_ == NULL) fields_ = new vector<UnknownField>;
    105   UnknownField field;
    106   field.number_ = number;
    107   field.SetType(UnknownField::TYPE_VARINT);
    108   field.varint_ = value;
    109   fields_->push_back(field);
    110 }
    111 
    112 void UnknownFieldSet::AddFixed32(int number, uint32 value) {
    113   if (fields_ == NULL) fields_ = new vector<UnknownField>;
    114   UnknownField field;
    115   field.number_ = number;
    116   field.SetType(UnknownField::TYPE_FIXED32);
    117   field.fixed32_ = value;
    118   fields_->push_back(field);
    119 }
    120 
    121 void UnknownFieldSet::AddFixed64(int number, uint64 value) {
    122   if (fields_ == NULL) fields_ = new vector<UnknownField>;
    123   UnknownField field;
    124   field.number_ = number;
    125   field.SetType(UnknownField::TYPE_FIXED64);
    126   field.fixed64_ = value;
    127   fields_->push_back(field);
    128 }
    129 
    130 string* UnknownFieldSet::AddLengthDelimited(int number) {
    131   if (fields_ == NULL) fields_ = new vector<UnknownField>;
    132   UnknownField field;
    133   field.number_ = number;
    134   field.SetType(UnknownField::TYPE_LENGTH_DELIMITED);
    135   field.length_delimited_.string_value_ = new string;
    136   fields_->push_back(field);
    137   return field.length_delimited_.string_value_;
    138 }
    139 
    140 
    141 UnknownFieldSet* UnknownFieldSet::AddGroup(int number) {
    142   if (fields_ == NULL) fields_ = new vector<UnknownField>;
    143   UnknownField field;
    144   field.number_ = number;
    145   field.SetType(UnknownField::TYPE_GROUP);
    146   field.group_ = new UnknownFieldSet;
    147   fields_->push_back(field);
    148   return field.group_;
    149 }
    150 
    151 void UnknownFieldSet::AddField(const UnknownField& field) {
    152   if (fields_ == NULL) fields_ = new vector<UnknownField>;
    153   fields_->push_back(field);
    154   fields_->back().DeepCopy();
    155 }
    156 
    157 void UnknownFieldSet::DeleteSubrange(int start, int num) {
    158   GOOGLE_DCHECK(fields_ != NULL);
    159   // Delete the specified fields.
    160   for (int i = 0; i < num; ++i) {
    161     (*fields_)[i + start].Delete();
    162   }
    163   // Slide down the remaining fields.
    164   for (int i = start + num; i < fields_->size(); ++i) {
    165     (*fields_)[i - num] = (*fields_)[i];
    166   }
    167   // Pop off the # of deleted fields.
    168   for (int i = 0; i < num; ++i) {
    169     fields_->pop_back();
    170   }
    171 }
    172 
    173 void UnknownFieldSet::DeleteByNumber(int number) {
    174   if (fields_ == NULL) return;
    175   int left = 0;  // The number of fields left after deletion.
    176   for (int i = 0; i < fields_->size(); ++i) {
    177     UnknownField* field = &(*fields_)[i];
    178     if (field->number() == number) {
    179       field->Delete();
    180     } else {
    181       if (i != left) {
    182         (*fields_)[left] = (*fields_)[i];
    183       }
    184       ++left;
    185     }
    186   }
    187   fields_->resize(left);
    188 }
    189 
    190 bool UnknownFieldSet::MergeFromCodedStream(io::CodedInputStream* input) {
    191   UnknownFieldSet other;
    192   if (internal::WireFormat::SkipMessage(input, &other) &&
    193       input->ConsumedEntireMessage()) {
    194     MergeFrom(other);
    195     return true;
    196   } else {
    197     return false;
    198   }
    199 }
    200 
    201 bool UnknownFieldSet::ParseFromCodedStream(io::CodedInputStream* input) {
    202   Clear();
    203   return MergeFromCodedStream(input);
    204 }
    205 
    206 bool UnknownFieldSet::ParseFromZeroCopyStream(io::ZeroCopyInputStream* input) {
    207   io::CodedInputStream coded_input(input);
    208   return (ParseFromCodedStream(&coded_input) &&
    209           coded_input.ConsumedEntireMessage());
    210 }
    211 
    212 bool UnknownFieldSet::ParseFromArray(const void* data, int size) {
    213   io::ArrayInputStream input(data, size);
    214   return ParseFromZeroCopyStream(&input);
    215 }
    216 
    217 void UnknownField::Delete() {
    218   switch (type()) {
    219     case UnknownField::TYPE_LENGTH_DELIMITED:
    220       delete length_delimited_.string_value_;
    221       break;
    222     case UnknownField::TYPE_GROUP:
    223       delete group_;
    224       break;
    225     default:
    226       break;
    227   }
    228 }
    229 
    230 void UnknownField::DeepCopy() {
    231   switch (type()) {
    232     case UnknownField::TYPE_LENGTH_DELIMITED:
    233       length_delimited_.string_value_ = new string(
    234           *length_delimited_.string_value_);
    235       break;
    236     case UnknownField::TYPE_GROUP: {
    237       UnknownFieldSet* group = new UnknownFieldSet;
    238       group->MergeFrom(*group_);
    239       group_ = group;
    240       break;
    241     }
    242     default:
    243       break;
    244   }
    245 }
    246 
    247 
    248 void UnknownField::SerializeLengthDelimitedNoTag(
    249     io::CodedOutputStream* output) const {
    250   GOOGLE_DCHECK_EQ(TYPE_LENGTH_DELIMITED, type());
    251   const string& data = *length_delimited_.string_value_;
    252   output->WriteVarint32(data.size());
    253   output->WriteRawMaybeAliased(data.data(), data.size());
    254 }
    255 
    256 uint8* UnknownField::SerializeLengthDelimitedNoTagToArray(uint8* target) const {
    257   GOOGLE_DCHECK_EQ(TYPE_LENGTH_DELIMITED, type());
    258   const string& data = *length_delimited_.string_value_;
    259   target = io::CodedOutputStream::WriteVarint32ToArray(data.size(), target);
    260   target = io::CodedOutputStream::WriteStringToArray(data, target);
    261   return target;
    262 }
    263 
    264 }  // namespace protobuf
    265 }  // namespace google
    266