279 lines
10 KiB
C++
279 lines
10 KiB
C++
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#ifndef OSMIUM_IO_BZIP2_COMPRESSION_HPP
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#define OSMIUM_IO_BZIP2_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 <cstdio>
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#include <stdexcept>
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#include <string>
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#include <bzlib.h>
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#ifndef _MSC_VER
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# include <unistd.h>
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#endif
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#include <osmium/io/compression.hpp>
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#include <osmium/io/file_compression.hpp>
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#include <osmium/util/cast.hpp>
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#include <osmium/util/compatibility.hpp>
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namespace osmium {
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/**
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* Exception thrown when there are problems compressing or
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* decompressing bzip2 files.
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*/
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struct bzip2_error : public std::runtime_error {
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int bzip2_error_code;
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int system_errno;
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bzip2_error(const std::string& what, int error_code) :
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std::runtime_error(what),
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bzip2_error_code(error_code),
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system_errno(error_code == BZ_IO_ERROR ? errno : 0) {
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}
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}; // struct bzip2_error
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namespace io {
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namespace detail {
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OSMIUM_NORETURN inline void throw_bzip2_error(BZFILE* bzfile, const char* msg, int bzlib_error=0) {
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std::string error("bzip2 error: ");
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error += msg;
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error += ": ";
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int errnum = bzlib_error;
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if (bzlib_error) {
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error += std::to_string(bzlib_error);
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} else {
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error += ::BZ2_bzerror(bzfile, &errnum);
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}
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throw osmium::bzip2_error(error, errnum);
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}
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} // namespace detail
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class Bzip2Compressor : public Compressor {
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FILE* m_file;
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int m_bzerror;
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BZFILE* m_bzfile;
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public:
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explicit Bzip2Compressor(int fd) :
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Compressor(),
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m_file(fdopen(dup(fd), "wb")),
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m_bzerror(BZ_OK),
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m_bzfile(::BZ2_bzWriteOpen(&m_bzerror, m_file, 6, 0, 0)) {
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if (!m_bzfile) {
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detail::throw_bzip2_error(m_bzfile, "write open failed", m_bzerror);
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}
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}
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~Bzip2Compressor() 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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int error;
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::BZ2_bzWrite(&error, m_bzfile, const_cast<char*>(data.data()), static_cast_with_assert<int>(data.size()));
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if (error != BZ_OK && error != BZ_STREAM_END) {
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detail::throw_bzip2_error(m_bzfile, "write failed", error);
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}
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}
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void close() override final {
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if (m_bzfile) {
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int error;
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::BZ2_bzWriteClose(&error, m_bzfile, 0, nullptr, nullptr);
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m_bzfile = nullptr;
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if (m_file) {
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fclose(m_file);
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}
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if (error != BZ_OK) {
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detail::throw_bzip2_error(m_bzfile, "write close failed", error);
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}
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}
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}
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}; // class Bzip2Compressor
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class Bzip2Decompressor : public Decompressor {
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FILE* m_file;
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int m_bzerror;
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BZFILE* m_bzfile;
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bool m_stream_end {false};
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public:
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Bzip2Decompressor(int fd) :
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Decompressor(),
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m_file(fdopen(dup(fd), "rb")),
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m_bzerror(BZ_OK),
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m_bzfile(::BZ2_bzReadOpen(&m_bzerror, m_file, 0, 0, nullptr, 0)) {
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if (!m_bzfile) {
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detail::throw_bzip2_error(m_bzfile, "read open failed", m_bzerror);
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}
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}
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~Bzip2Decompressor() 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_stream_end) {
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buffer.resize(osmium::io::Decompressor::input_buffer_size);
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int error;
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int nread = ::BZ2_bzRead(&error, m_bzfile, const_cast<char*>(buffer.data()), static_cast_with_assert<int>(buffer.size()));
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if (error != BZ_OK && error != BZ_STREAM_END) {
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detail::throw_bzip2_error(m_bzfile, "read failed", error);
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}
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if (error == BZ_STREAM_END) {
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void* unused;
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int nunused;
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if (! feof(m_file)) {
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::BZ2_bzReadGetUnused(&error, m_bzfile, &unused, &nunused);
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if (error != BZ_OK) {
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detail::throw_bzip2_error(m_bzfile, "get unused failed", error);
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}
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std::string unused_data(static_cast<const char*>(unused), static_cast<std::string::size_type>(nunused));
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::BZ2_bzReadClose(&error, m_bzfile);
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if (error != BZ_OK) {
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detail::throw_bzip2_error(m_bzfile, "read close failed", error);
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}
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m_bzfile = ::BZ2_bzReadOpen(&error, m_file, 0, 0, const_cast<void*>(static_cast<const void*>(unused_data.data())), static_cast_with_assert<int>(unused_data.size()));
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if (error != BZ_OK) {
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detail::throw_bzip2_error(m_bzfile, "read open failed", error);
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}
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} else {
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m_stream_end = true;
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}
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}
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buffer.resize(static_cast<std::string::size_type>(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_bzfile) {
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int error;
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::BZ2_bzReadClose(&error, m_bzfile);
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m_bzfile = nullptr;
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if (m_file) {
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fclose(m_file);
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}
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if (error != BZ_OK) {
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detail::throw_bzip2_error(m_bzfile, "read close failed", error);
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}
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}
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}
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}; // class Bzip2Decompressor
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class Bzip2BufferDecompressor : public Decompressor {
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const char* m_buffer;
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size_t m_buffer_size;
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bz_stream m_bzstream;
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public:
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Bzip2BufferDecompressor(const char* buffer, size_t size) :
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m_buffer(buffer),
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m_buffer_size(size),
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m_bzstream() {
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m_bzstream.next_in = const_cast<char*>(buffer);
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m_bzstream.avail_in = static_cast_with_assert<unsigned int>(size);
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int result = BZ2_bzDecompressInit(&m_bzstream, 0, 0);
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if (result != BZ_OK) {
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std::string message("bzip2 error: decompression init failed: ");
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throw bzip2_error(message, result);
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}
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}
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~Bzip2BufferDecompressor() override final {
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BZ2_bzDecompressEnd(&m_bzstream);
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}
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std::string read() override final {
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std::string output;
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if (m_buffer) {
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const size_t buffer_size = 10240;
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output.resize(buffer_size);
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m_bzstream.next_out = const_cast<char*>(output.data());
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m_bzstream.avail_out = buffer_size;
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int result = BZ2_bzDecompress(&m_bzstream);
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if (result != BZ_OK) {
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m_buffer = nullptr;
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m_buffer_size = 0;
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}
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if (result != BZ_OK && result != BZ_STREAM_END) {
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std::string message("bzip2 error: decompress failed: ");
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throw bzip2_error(message, result);
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}
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output.resize(static_cast<unsigned long>(m_bzstream.next_out - output.data()));
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}
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return output;
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}
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}; // class Bzip2BufferDecompressor
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namespace {
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const bool registered_bzip2_compression = osmium::io::CompressionFactory::instance().register_compression(osmium::io::file_compression::bzip2,
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[](int fd) { return new osmium::io::Bzip2Compressor(fd); },
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[](int fd) { return new osmium::io::Bzip2Decompressor(fd); },
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[](const char* buffer, size_t size) { return new osmium::io::Bzip2BufferDecompressor(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_BZIP2_COMPRESSION_HPP
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