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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_encoder.h"
#include "draco/core/varint_encoding.h"
namespace draco {
bool MetadataEncoder::EncodeMetadata(EncoderBuffer *out_buffer,
const Metadata *metadata) {
const std::map<std::string, EntryValue> &entries = metadata->entries();
// Encode number of entries.
EncodeVarint(static_cast<uint32_t>(metadata->num_entries()), out_buffer);
// Encode all entries.
for (const auto &entry : entries) {
if (!EncodeString(out_buffer, entry.first)) {
return false;
}
const std::vector<uint8_t> &entry_value = entry.second.data();
const uint32_t data_size = static_cast<uint32_t>(entry_value.size());
EncodeVarint(data_size, out_buffer);
out_buffer->Encode(entry_value.data(), data_size);
}
const std::map<std::string, std::unique_ptr<Metadata>> &sub_metadatas =
metadata->sub_metadatas();
// Encode number of sub-metadata
EncodeVarint(static_cast<uint32_t>(sub_metadatas.size()), out_buffer);
// Encode each sub-metadata
for (auto &&sub_metadata_entry : sub_metadatas) {
if (!EncodeString(out_buffer, sub_metadata_entry.first)) {
return false;
}
EncodeMetadata(out_buffer, sub_metadata_entry.second.get());
}
return true;
}
bool MetadataEncoder::EncodeAttributeMetadata(
EncoderBuffer *out_buffer, const AttributeMetadata *metadata) {
if (!metadata) {
return false;
}
// Encode attribute id.
EncodeVarint(metadata->att_unique_id(), out_buffer);
EncodeMetadata(out_buffer, static_cast<const Metadata *>(metadata));
return true;
}
bool MetadataEncoder::EncodeGeometryMetadata(EncoderBuffer *out_buffer,
const GeometryMetadata *metadata) {
if (!metadata) {
return false;
}
// Encode number of attribute metadata.
const std::vector<std::unique_ptr<AttributeMetadata>> &att_metadatas =
metadata->attribute_metadatas();
// TODO(draco-eng): Limit the number of attributes.
EncodeVarint(static_cast<uint32_t>(att_metadatas.size()), out_buffer);
// Encode each attribute metadata
for (auto &&att_metadata : att_metadatas) {
EncodeAttributeMetadata(out_buffer, att_metadata.get());
}
// Encode normal metadata part.
EncodeMetadata(out_buffer, static_cast<const Metadata *>(metadata));
return true;
}
bool MetadataEncoder::EncodeString(EncoderBuffer *out_buffer,
const std::string &str) {
// We only support string of maximum length 255 which is using one byte to
// encode the length.
if (str.size() > 255) {
return false;
}
if (str.empty()) {
out_buffer->Encode(static_cast<uint8_t>(0));
} else {
out_buffer->Encode(static_cast<uint8_t>(str.size()));
out_buffer->Encode(str.c_str(), str.size());
}
return true;
}
} // namespace draco
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