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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* single bz2 archive handling (requires libbz2)
*/
#include "Bzip2ArchivePlugin.hxx"
#include "../ArchivePlugin.hxx"
#include "../ArchiveFile.hxx"
#include "../ArchiveVisitor.hxx"
#include "input/InputStream.hxx"
#include "input/LocalOpen.hxx"
#include "fs/Path.hxx"
#include <bzlib.h>
#include <stdexcept>
#include <utility>
class Bzip2ArchiveFile final : public ArchiveFile {
std::string name;
std::shared_ptr<InputStream> istream;
public:
Bzip2ArchiveFile(Path path, InputStreamPtr &&_is)
:name(path.GetBase().c_str()),
istream(std::move(_is)) {
// remove .bz2 suffix
const size_t len = name.length();
if (len > 4)
name.erase(len - 4);
}
void Visit(ArchiveVisitor &visitor) override {
visitor.VisitArchiveEntry(name.c_str());
}
InputStreamPtr OpenStream(const char *path,
Mutex &mutex) override;
};
class Bzip2InputStream final : public InputStream {
std::shared_ptr<InputStream> input;
bz_stream bzstream{};
bool eof = false;
char buffer[5000];
public:
Bzip2InputStream(std::shared_ptr<InputStream> _input,
const char *uri,
Mutex &mutex);
~Bzip2InputStream() noexcept override;
Bzip2InputStream(const Bzip2InputStream &) = delete;
Bzip2InputStream &operator=(const Bzip2InputStream &) = delete;
/* virtual methods from InputStream */
[[nodiscard]] bool IsEOF() const noexcept override;
size_t Read(std::unique_lock<Mutex> &lock,
void *ptr, size_t size) override;
private:
void Open();
bool FillBuffer();
};
/* archive open && listing routine */
static std::unique_ptr<ArchiveFile>
bz2_open(Path pathname)
{
static Mutex mutex;
auto is = OpenLocalInputStream(pathname, mutex);
return std::make_unique<Bzip2ArchiveFile>(pathname, std::move(is));
}
/* single archive handling */
Bzip2InputStream::Bzip2InputStream(std::shared_ptr<InputStream> _input,
const char *_uri,
Mutex &_mutex)
:InputStream(_uri, _mutex),
input(std::move(_input))
{
bzstream.next_in = (char *)buffer;
int ret = BZ2_bzDecompressInit(&bzstream, 0, 0);
if (ret != BZ_OK)
throw std::runtime_error("BZ2_bzDecompressInit() has failed");
SetReady();
}
Bzip2InputStream::~Bzip2InputStream() noexcept
{
BZ2_bzDecompressEnd(&bzstream);
}
InputStreamPtr
Bzip2ArchiveFile::OpenStream(const char *path,
Mutex &mutex)
{
return std::make_unique<Bzip2InputStream>(istream, path, mutex);
}
inline bool
Bzip2InputStream::FillBuffer()
{
if (bzstream.avail_in > 0)
return true;
size_t count = input->LockRead(buffer, sizeof(buffer));
if (count == 0)
return false;
bzstream.next_in = buffer;
bzstream.avail_in = count;
return true;
}
size_t
Bzip2InputStream::Read(std::unique_lock<Mutex> &, void *ptr, size_t length)
{
if (eof)
return 0;
const ScopeUnlock unlock(mutex);
bzstream.next_out = (char *)ptr;
bzstream.avail_out = length;
do {
const bool had_input = FillBuffer();
const int bz_result = BZ2_bzDecompress(&bzstream);
if (bz_result == BZ_STREAM_END) {
eof = true;
break;
}
if (bz_result != BZ_OK)
throw std::runtime_error("BZ2_bzDecompress() has failed");
if (!had_input && bzstream.avail_out == length)
throw std::runtime_error("Unexpected end of bzip2 file");
} while (bzstream.avail_out == length);
const size_t nbytes = length - bzstream.avail_out;
offset += nbytes;
return nbytes;
}
bool
Bzip2InputStream::IsEOF() const noexcept
{
return eof;
}
/* exported structures */
static constexpr const char *bz2_extensions[] = {
"bz2",
nullptr
};
const ArchivePlugin bz2_archive_plugin = {
"bz2",
nullptr,
nullptr,
bz2_open,
bz2_extensions,
};
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