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81 lines
2.8 KiB
C++
81 lines
2.8 KiB
C++
// Copyright 2016 The Draco Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef DRACO_CORE_DATA_BUFFER_H_
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#define DRACO_CORE_DATA_BUFFER_H_
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#include <cstring>
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#include <ostream>
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#include <vector>
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#include "core/draco_types.h"
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namespace draco {
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// Buffer descriptor servers as a unique identifier of a buffer.
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struct DataBufferDescriptor {
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DataBufferDescriptor() : buffer_id(0), buffer_update_count(0) {}
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// Id of the data buffer.
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int64_t buffer_id;
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// The number of times the buffer content was updated.
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int64_t buffer_update_count;
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};
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// Class used for storing raw buffer data.
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class DataBuffer {
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public:
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DataBuffer();
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void Update(const void *data, int64_t size);
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// TODO(zhafang): The two update functions should be combined. I will
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// leave for now in case it breaks any geometry compression tools.
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void Update(const void *data, int64_t size, int64_t offset);
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void WriteDataToStream(std::ostream &stream);
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// Reads data from the buffer. Potentially unsafe, called needs to ensure
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// the accessed memory is valid.
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void Read(int64_t byte_pos, void *out_data, size_t data_size) const {
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memcpy(out_data, data() + byte_pos, data_size);
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}
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// Writes data to the buffer. Unsafe, caller must ensure the accessed memory
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// is valid.
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void Write(int64_t byte_pos, const void *in_data, size_t data_size) {
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memcpy(const_cast<uint8_t *>(data()) + byte_pos, in_data, data_size);
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}
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// Copies data from another buffer to this buffer.
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void Copy(int64_t dst_offset, const DataBuffer *src_buf, int64_t src_offset,
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int64_t size) {
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memcpy(const_cast<uint8_t *>(data()) + dst_offset,
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src_buf->data() + src_offset, size);
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}
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void set_update_count(int64_t buffer_update_count) {
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descriptor_.buffer_update_count = buffer_update_count;
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}
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int64_t update_count() const { return descriptor_.buffer_update_count; }
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size_t data_size() const { return data_.size(); }
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const uint8_t *data() const { return data_.data(); }
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int64_t buffer_id() const { return descriptor_.buffer_id; }
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void set_buffer_id(int64_t buffer_id) { descriptor_.buffer_id = buffer_id; }
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private:
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std::vector<uint8_t> data_;
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// Counter incremented by Update() calls.
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DataBufferDescriptor descriptor_;
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};
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} // namespace draco
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#endif // DRACO_CORE_DATA_BUFFER_H_
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