282 lines
9.0 KiB
C++
282 lines
9.0 KiB
C++
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#ifndef OSMIUM_IO_COMPRESSION_HPP
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#define OSMIUM_IO_COMPRESSION_HPP
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/*
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This file is part of Osmium (http://osmcode.org/libosmium).
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Copyright 2013,2014 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 <cerrno>
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#include <functional>
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#include <map>
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#include <memory>
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#include <stdexcept>
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#include <string>
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#include <system_error>
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#include <utility>
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#ifndef _MSC_VER
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# include <unistd.h>
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#else
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# include <io.h>
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#endif
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#include <osmium/io/detail/read_write.hpp>
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#include <osmium/io/file_compression.hpp>
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#include <osmium/util/compatibility.hpp>
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namespace osmium {
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namespace io {
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class Compressor {
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public:
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Compressor() = default;
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virtual ~Compressor() {
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}
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virtual void write(const std::string& data) = 0;
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virtual void close() = 0;
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}; // class Compressor
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class Decompressor {
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public:
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static constexpr size_t input_buffer_size = 256 * 1024;
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Decompressor() = default;
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Decompressor(const Decompressor&) = delete;
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Decompressor& operator=(const Decompressor&) = delete;
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Decompressor(Decompressor&&) = delete;
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Decompressor& operator=(Decompressor&&) = delete;
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virtual ~Decompressor() {
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}
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virtual std::string read() = 0;
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virtual void close() {
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}
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}; // class Decompressor
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/**
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* This singleton factory class is used to register compression
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* algorithms used for reading and writing OSM files.
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*
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* For each algorithm we store two functions that construct
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* a compressor and decompressor object, respectively.
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*/
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class CompressionFactory {
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public:
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typedef std::function<osmium::io::Compressor*(int)> create_compressor_type;
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typedef std::function<osmium::io::Decompressor*(int)> create_decompressor_type_fd;
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typedef std::function<osmium::io::Decompressor*(const char*, size_t)> create_decompressor_type_buffer;
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private:
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typedef std::map<const osmium::io::file_compression, std::tuple<create_compressor_type, create_decompressor_type_fd, create_decompressor_type_buffer>> compression_map_type;
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compression_map_type m_callbacks;
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CompressionFactory() = default;
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CompressionFactory(const CompressionFactory&) = delete;
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CompressionFactory& operator=(const CompressionFactory&) = delete;
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CompressionFactory(CompressionFactory&&) = delete;
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CompressionFactory& operator=(CompressionFactory&&) = delete;
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OSMIUM_NORETURN void error(osmium::io::file_compression compression) {
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std::string error_message {"Support for compression '"};
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error_message += as_string(compression);
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error_message += "' not compiled into this binary.";
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throw std::runtime_error(error_message);
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}
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public:
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static CompressionFactory& instance() {
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static CompressionFactory factory;
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return factory;
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}
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bool register_compression(
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osmium::io::file_compression compression,
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create_compressor_type create_compressor,
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create_decompressor_type_fd create_decompressor_fd,
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create_decompressor_type_buffer create_decompressor_buffer) {
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compression_map_type::value_type cc(compression, std::make_tuple(create_compressor, create_decompressor_fd, create_decompressor_buffer));
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return m_callbacks.insert(cc).second;
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}
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std::unique_ptr<osmium::io::Compressor> create_compressor(osmium::io::file_compression compression, int fd) {
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auto it = m_callbacks.find(compression);
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if (it != m_callbacks.end()) {
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return std::unique_ptr<osmium::io::Compressor>(std::get<0>(it->second)(fd));
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}
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error(compression);
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}
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std::unique_ptr<osmium::io::Decompressor> create_decompressor(osmium::io::file_compression compression, int fd) {
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auto it = m_callbacks.find(compression);
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if (it != m_callbacks.end()) {
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return std::unique_ptr<osmium::io::Decompressor>(std::get<1>(it->second)(fd));
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}
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error(compression);
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}
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std::unique_ptr<osmium::io::Decompressor> create_decompressor(osmium::io::file_compression compression, const char* buffer, size_t size) {
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auto it = m_callbacks.find(compression);
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if (it != m_callbacks.end()) {
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return std::unique_ptr<osmium::io::Decompressor>(std::get<2>(it->second)(buffer, size));
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}
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error(compression);
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}
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}; // class CompressionFactory
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class NoCompressor : public Compressor {
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int m_fd;
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public:
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NoCompressor(int fd) :
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Compressor(),
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m_fd(fd) {
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}
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~NoCompressor() override final {
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close();
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}
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void write(const std::string& data) override final {
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osmium::io::detail::reliable_write(m_fd, data.data(), data.size());
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}
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void close() override final {
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if (m_fd >= 0) {
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::close(m_fd);
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m_fd = -1;
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}
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}
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}; // class NoCompressor
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class NoDecompressor : public Decompressor {
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int m_fd;
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const char *m_buffer;
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size_t m_buffer_size;
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public:
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NoDecompressor(int fd) :
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Decompressor(),
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m_fd(fd),
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m_buffer(nullptr),
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m_buffer_size(0) {
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}
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NoDecompressor(const char* buffer, size_t size) :
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Decompressor(),
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m_fd(-1),
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m_buffer(buffer),
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m_buffer_size(size) {
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}
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~NoDecompressor() override final {
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close();
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}
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std::string read() override final {
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std::string buffer;
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if (m_buffer) {
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if (m_buffer_size != 0) {
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size_t size = m_buffer_size;
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m_buffer_size = 0;
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buffer.append(m_buffer, size);
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}
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} else {
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buffer.resize(osmium::io::Decompressor::input_buffer_size);
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ssize_t nread = ::read(m_fd, const_cast<char*>(buffer.data()), buffer.size());
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if (nread < 0) {
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throw std::system_error(errno, std::system_category(), "Read failed");
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}
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buffer.resize(static_cast<size_t>(nread));
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}
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return buffer;
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}
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void close() override final {
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if (m_fd >= 0) {
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::close(m_fd);
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m_fd = -1;
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}
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}
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}; // class NoDecompressor
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namespace {
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const bool registered_no_compression = osmium::io::CompressionFactory::instance().register_compression(osmium::io::file_compression::none,
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[](int fd) { return new osmium::io::NoCompressor(fd); },
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[](int fd) { return new osmium::io::NoDecompressor(fd); },
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[](const char* buffer, size_t size) { return new osmium::io::NoDecompressor(buffer, size); }
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);
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} // anonymous namespace
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} // namespace io
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} // namespace osmium
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#endif // OSMIUM_IO_COMPRESSION_HPP
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