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72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
// SPDX-License-Identifier: BSD-3-Clause
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/**
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* Copyright (c) MapBox
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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* - Neither the name "MapBox" nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef VECTOR_TILE_COMPRESSION_HPP_
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#define VECTOR_TILE_COMPRESSION_HPP_
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#include <cstdint>
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#include <string>
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// zlib
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#include <zlib.h>
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namespace mapnik
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{
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namespace vector_tile_impl
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{
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inline bool is_zlib_compressed(const char * data, std::size_t size)
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{
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return size > 2 &&
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static_cast<uint8_t>(data[0]) == 0x78 &&
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(
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static_cast<uint8_t>(data[1]) == 0x9C ||
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static_cast<uint8_t>(data[1]) == 0x01 ||
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static_cast<uint8_t>(data[1]) == 0xDA ||
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static_cast<uint8_t>(data[1]) == 0x5E
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);
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}
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inline bool is_gzip_compressed(const char * data, std::size_t size)
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{
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return size > 2 && static_cast<uint8_t>(data[0]) == 0x1F && static_cast<uint8_t>(data[1]) == 0x8B;
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}
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// decodes both zlib and gzip
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// http://stackoverflow.com/a/1838702/2333354
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void zlib_decompress(const char * data,
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std::size_t size,
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std::string & output);
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} // end ns vector_tile_impl
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} // end ns mapnik
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#endif /* VECTOR_TILE_COMPRESSION_HPP_ */
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