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https://github.com/mapnik/mapnik.git
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68 lines
2.6 KiB
C++
68 lines
2.6 KiB
C++
/**
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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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// zlib
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#include <zlib.h>
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// std
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#include <stdexcept>
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#include "vector_tile_compression.hpp"
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// decodes both zlib and gzip
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// http://stackoverflow.com/a/1838702/2333354
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void mapnik::vector_tile_impl::zlib_decompress(const char * data, std::size_t size, std::string & output)
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{
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z_stream inflate_s;
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inflate_s.zalloc = Z_NULL;
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inflate_s.zfree = Z_NULL;
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inflate_s.opaque = Z_NULL;
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inflate_s.avail_in = 0;
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inflate_s.next_in = Z_NULL;
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inflateInit2(&inflate_s, 32 + 15);
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inflate_s.next_in = (Bytef *)data;
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inflate_s.avail_in = size;
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size_t length = 0;
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do {
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output.resize(length + 2 * size);
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inflate_s.avail_out = 2 * size;
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inflate_s.next_out = (Bytef *)(output.data() + length);
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int ret = inflate(&inflate_s, Z_FINISH);
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if (ret != Z_STREAM_END && ret != Z_OK && ret != Z_BUF_ERROR)
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{
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std::string error_msg = inflate_s.msg;
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inflateEnd(&inflate_s);
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throw std::runtime_error(error_msg);
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}
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length += (2 * size - inflate_s.avail_out);
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} while (inflate_s.avail_out == 0);
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inflateEnd(&inflate_s);
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output.resize(length);
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}
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