116 lines
4.2 KiB
C++
116 lines
4.2 KiB
C++
#ifndef OSMIUM_IO_DETAIL_ZLIB_HPP
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#define OSMIUM_IO_DETAIL_ZLIB_HPP
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/*
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This file is part of Osmium (http://osmcode.org/libosmium).
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Copyright 2013-2017 Jochen Topf <jochen@topf.org> and others (see README).
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include <string>
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#include <zlib.h>
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#include <protozero/types.hpp>
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#include <osmium/io/error.hpp>
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#include <osmium/util/cast.hpp>
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namespace osmium {
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namespace io {
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namespace detail {
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/**
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* Compress data using zlib.
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*
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* Note that this function can not compress data larger than
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* what fits in an unsigned long, on Windows this is usually 32bit.
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*
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* @param input Data to compress.
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* @returns Compressed data.
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*/
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inline std::string zlib_compress(const std::string& input) {
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unsigned long output_size = ::compressBound(osmium::static_cast_with_assert<unsigned long>(input.size()));
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std::string output(output_size, '\0');
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const auto result = ::compress(
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reinterpret_cast<unsigned char*>(const_cast<char *>(output.data())),
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&output_size,
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reinterpret_cast<const unsigned char*>(input.data()),
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osmium::static_cast_with_assert<unsigned long>(input.size())
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);
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if (result != Z_OK) {
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throw io_error(std::string("failed to compress data: ") + zError(result));
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}
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output.resize(output_size);
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return output;
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}
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/**
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* Uncompress data using zlib.
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*
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* Note that this function can not uncompress data larger than
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* what fits in an unsigned long, on Windows this is usually 32bit.
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*
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* @param input Compressed input data.
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* @param raw_size Size of uncompressed data.
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* @param output Uncompressed result data.
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* @returns Pointer and size to incompressed data.
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*/
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inline protozero::data_view zlib_uncompress_string(const char* input, unsigned long input_size, unsigned long raw_size, std::string& output) {
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output.resize(raw_size);
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const auto result = ::uncompress(
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reinterpret_cast<unsigned char*>(&*output.begin()),
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&raw_size,
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reinterpret_cast<const unsigned char*>(input),
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input_size
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);
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if (result != Z_OK) {
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throw io_error(std::string("failed to uncompress data: ") + zError(result));
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}
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return protozero::data_view{output.data(), output.size()};
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}
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} // namespace detail
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} // namespace io
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} // namespace osmium
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#endif // OSMIUM_IO_DETAIL_ZLIB_HPP
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