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Libraries: Rename LibTar to LibArchive
This is in preparation for a new implementation of zip archive extraction and creation.
This commit is contained in:
Idan Horowitz
Andreas Kling
parent
40eab55e7d
commit
a809db90dd
8 changed files with 36 additions and 36 deletions
190
Userland/Libraries/LibArchive/TarStream.cpp
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190
Userland/Libraries/LibArchive/TarStream.cpp
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/*
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* Copyright (c) 2020, Peter Elliott <pelliott@ualberta.ca>
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@gmail.com>
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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
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. 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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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED 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
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibArchive/TarStream.h>
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#include <string.h>
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namespace Archive {
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TarFileStream::TarFileStream(TarInputStream& tar_stream)
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: m_tar_stream(tar_stream)
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, m_generation(tar_stream.m_generation)
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{
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}
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size_t TarFileStream::read(Bytes bytes)
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{
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// verify that the stream has not advanced
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VERIFY(m_tar_stream.m_generation == m_generation);
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if (has_any_error())
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return 0;
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auto to_read = min(bytes.size(), m_tar_stream.header().size() - m_tar_stream.m_file_offset);
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auto nread = m_tar_stream.m_stream.read(bytes.trim(to_read));
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m_tar_stream.m_file_offset += nread;
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return nread;
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}
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bool TarFileStream::unreliable_eof() const
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{
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// verify that the stream has not advanced
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VERIFY(m_tar_stream.m_generation == m_generation);
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return m_tar_stream.m_stream.unreliable_eof()
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|| m_tar_stream.m_file_offset >= m_tar_stream.header().size();
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}
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bool TarFileStream::read_or_error(Bytes bytes)
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{
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// verify that the stream has not advanced
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VERIFY(m_tar_stream.m_generation == m_generation);
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if (read(bytes) < bytes.size()) {
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set_fatal_error();
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return false;
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}
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return true;
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}
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bool TarFileStream::discard_or_error(size_t count)
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{
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// verify that the stream has not advanced
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VERIFY(m_tar_stream.m_generation == m_generation);
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if (count > m_tar_stream.header().size() - m_tar_stream.m_file_offset) {
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return false;
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}
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m_tar_stream.m_file_offset += count;
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return m_tar_stream.m_stream.discard_or_error(count);
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}
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TarInputStream::TarInputStream(InputStream& stream)
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: m_stream(stream)
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{
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if (!m_stream.read_or_error(Bytes(&m_header, sizeof(m_header)))) {
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m_finished = true;
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m_stream.handle_any_error(); // clear out errors so we dont assert
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return;
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}
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VERIFY(m_stream.discard_or_error(block_size - sizeof(TarFileHeader)));
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}
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static constexpr unsigned long block_ceiling(unsigned long offset)
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{
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return block_size * (1 + ((offset - 1) / block_size));
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}
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void TarInputStream::advance()
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{
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if (m_finished)
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return;
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m_generation++;
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VERIFY(m_stream.discard_or_error(block_ceiling(m_header.size()) - m_file_offset));
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m_file_offset = 0;
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if (!m_stream.read_or_error(Bytes(&m_header, sizeof(m_header)))) {
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m_finished = true;
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return;
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}
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if (!valid()) {
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m_finished = true;
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return;
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}
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VERIFY(m_stream.discard_or_error(block_size - sizeof(TarFileHeader)));
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}
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bool TarInputStream::valid() const
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{
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auto& header_magic = header().magic();
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auto& header_version = header().version();
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return (header_magic == gnu_magic && header_version == gnu_version) || (header_magic == ustar_magic && header_version == ustar_version);
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}
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TarFileStream TarInputStream::file_contents()
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{
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VERIFY(!m_finished);
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return TarFileStream(*this);
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}
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TarOutputStream::TarOutputStream(OutputStream& stream)
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: m_stream(stream)
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{
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}
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void TarOutputStream::add_directory(const String& path, mode_t mode)
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{
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VERIFY(!m_finished);
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TarFileHeader header;
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memset(&header, 0, sizeof(header));
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header.set_size(0);
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header.set_file_name(String::formatted("{}/", path)); // Old tar implementations assume directory names end with a /
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header.set_type_flag(TarFileType::Directory);
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header.set_mode(mode);
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header.set_magic(gnu_magic);
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header.set_version(gnu_version);
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header.calculate_checksum();
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VERIFY(m_stream.write_or_error(Bytes { &header, sizeof(header) }));
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u8 padding[block_size] = { 0 };
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VERIFY(m_stream.write_or_error(Bytes { &padding, block_size - sizeof(header) }));
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}
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void TarOutputStream::add_file(const String& path, mode_t mode, const ReadonlyBytes& bytes)
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{
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VERIFY(!m_finished);
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TarFileHeader header;
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memset(&header, 0, sizeof(header));
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header.set_size(bytes.size());
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header.set_file_name(path);
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header.set_type_flag(TarFileType::NormalFile);
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header.set_mode(mode);
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header.set_magic(gnu_magic);
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header.set_version(gnu_version);
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header.calculate_checksum();
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VERIFY(m_stream.write_or_error(Bytes { &header, sizeof(header) }));
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u8 padding[block_size] = { 0 };
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VERIFY(m_stream.write_or_error(Bytes { &padding, block_size - sizeof(header) }));
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size_t n_written = 0;
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while (n_written < bytes.size()) {
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n_written += m_stream.write(bytes.slice(n_written, min(bytes.size() - n_written, block_size)));
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}
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VERIFY(m_stream.write_or_error(Bytes { &padding, block_size - (n_written % block_size) }));
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}
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void TarOutputStream::finish()
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{
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VERIFY(!m_finished);
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u8 padding[block_size] = { 0 };
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m_stream.write_or_error(Bytes { &padding, block_size }); // 2 empty records that are used to signify the end of the archive
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m_stream.write_or_error(Bytes { &padding, block_size });
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m_finished = true;
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}
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}
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