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// Copyright 2017 The Draco Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "draco/metadata/metadata_decoder.h"
#include <string>
#include "draco/core/varint_decoding.h"
namespace draco {
MetadataDecoder::MetadataDecoder() : buffer_(nullptr) {}
bool MetadataDecoder::DecodeMetadata(DecoderBuffer *in_buffer,
Metadata *metadata) {
if (!metadata) {
return false;
}
buffer_ = in_buffer;
return DecodeMetadata(metadata);
}
bool MetadataDecoder::DecodeGeometryMetadata(DecoderBuffer *in_buffer,
GeometryMetadata *metadata) {
if (!metadata) {
return false;
}
buffer_ = in_buffer;
uint32_t num_att_metadata = 0;
if (!DecodeVarint(&num_att_metadata, buffer_)) {
return false;
}
// Decode attribute metadata.
for (uint32_t i = 0; i < num_att_metadata; ++i) {
uint32_t att_unique_id;
if (!DecodeVarint(&att_unique_id, buffer_)) {
return false;
}
std::unique_ptr<AttributeMetadata> att_metadata =
std::unique_ptr<AttributeMetadata>(new AttributeMetadata());
att_metadata->set_att_unique_id(att_unique_id);
if (!DecodeMetadata(static_cast<Metadata *>(att_metadata.get()))) {
return false;
}
metadata->AddAttributeMetadata(std::move(att_metadata));
}
return DecodeMetadata(static_cast<Metadata *>(metadata));
}
bool MetadataDecoder::DecodeMetadata(Metadata *metadata) {
struct MetadataPair {
Metadata *parent_metadata;
Metadata *decoded_metadata;
};
std::vector<MetadataPair> metadata_stack;
metadata_stack.push_back({nullptr, metadata});
while (!metadata_stack.empty()) {
const MetadataPair mp = metadata_stack.back();
metadata_stack.pop_back();
metadata = mp.decoded_metadata;
if (mp.parent_metadata != nullptr) {
std::string sub_metadata_name;
if (!DecodeName(&sub_metadata_name)) {
return false;
}
std::unique_ptr<Metadata> sub_metadata =
std::unique_ptr<Metadata>(new Metadata());
metadata = sub_metadata.get();
if (!mp.parent_metadata->AddSubMetadata(sub_metadata_name,
std::move(sub_metadata))) {
return false;
}
}
if (metadata == nullptr) {
return false;
}
uint32_t num_entries = 0;
if (!DecodeVarint(&num_entries, buffer_)) {
return false;
}
for (uint32_t i = 0; i < num_entries; ++i) {
if (!DecodeEntry(metadata)) {
return false;
}
}
uint32_t num_sub_metadata = 0;
if (!DecodeVarint(&num_sub_metadata, buffer_)) {
return false;
}
if (num_sub_metadata > buffer_->remaining_size()) {
// The decoded number of metadata items is unreasonably high.
return false;
}
for (uint32_t i = 0; i < num_sub_metadata; ++i) {
metadata_stack.push_back({metadata, nullptr});
}
}
return true;
}
bool MetadataDecoder::DecodeEntry(Metadata *metadata) {
std::string entry_name;
if (!DecodeName(&entry_name)) {
return false;
}
uint32_t data_size = 0;
if (!DecodeVarint(&data_size, buffer_)) {
return false;
}
if (data_size == 0) {
return false;
}
std::vector<uint8_t> entry_value(data_size);
if (!buffer_->Decode(&entry_value[0], data_size)) {
return false;
}
metadata->AddEntryBinary(entry_name, entry_value);
return true;
}
bool MetadataDecoder::DecodeName(std::string *name) {
uint8_t name_len = 0;
if (!buffer_->Decode(&name_len)) {
return false;
}
name->resize(name_len);
if (name_len == 0) {
return true;
}
if (!buffer_->Decode(&name->at(0), name_len)) {
return false;
}
return true;
}
} // namespace draco
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