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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.
*/
/**
* zip archive handling (requires zziplib)
*/
#include "ZzipArchivePlugin.hxx"
#include "../ArchivePlugin.hxx"
#include "../ArchiveFile.hxx"
#include "../ArchiveVisitor.hxx"
#include "input/InputStream.hxx"
#include "fs/Path.hxx"
#include "system/Error.hxx"
#include "util/RuntimeError.hxx"
#include <zzip/zzip.h>
#include <utility>
#include <inttypes.h> /* for PRIoffset (PRIu64) */
struct ZzipDir {
ZZIP_DIR *const dir;
explicit ZzipDir(Path path)
:dir(zzip_dir_open(path.c_str(), nullptr)) {
if (dir == nullptr)
throw FormatRuntimeError("Failed to open ZIP file %s",
path.c_str());
}
~ZzipDir() noexcept {
zzip_dir_close(dir);
}
ZzipDir(const ZzipDir &) = delete;
ZzipDir &operator=(const ZzipDir &) = delete;
};
class ZzipArchiveFile final : public ArchiveFile {
std::shared_ptr<ZzipDir> dir;
public:
template<typename D>
explicit ZzipArchiveFile(D &&_dir) noexcept
:dir(std::forward<D>(_dir)) {}
void Visit(ArchiveVisitor &visitor) override;
InputStreamPtr OpenStream(const char *path,
Mutex &mutex) override;
};
/* archive open && listing routine */
static std::unique_ptr<ArchiveFile>
zzip_archive_open(Path pathname)
{
return std::make_unique<ZzipArchiveFile>(std::make_shared<ZzipDir>(pathname));
}
inline void
ZzipArchiveFile::Visit(ArchiveVisitor &visitor)
{
zzip_rewinddir(dir->dir);
ZZIP_DIRENT dirent;
while (zzip_dir_read(dir->dir, &dirent))
//add only files
if (dirent.st_size > 0)
visitor.VisitArchiveEntry(dirent.d_name);
}
/* single archive handling */
class ZzipInputStream final : public InputStream {
std::shared_ptr<ZzipDir> dir;
ZZIP_FILE *const file;
public:
template<typename D>
ZzipInputStream(D &&_dir, const char *_uri,
Mutex &_mutex,
ZZIP_FILE *_file)
:InputStream(_uri, _mutex),
dir(std::forward<D>(_dir)), file(_file) {
//we are seekable (but its not recommendent to do so)
seekable = true;
ZZIP_STAT z_stat;
zzip_file_stat(file, &z_stat);
size = z_stat.st_size;
SetReady();
}
~ZzipInputStream() noexcept override {
zzip_file_close(file);
}
ZzipInputStream(const ZzipInputStream &) = delete;
ZzipInputStream &operator=(const ZzipInputStream &) = 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;
void Seek(std::unique_lock<Mutex> &lock, offset_type offset) override;
};
InputStreamPtr
ZzipArchiveFile::OpenStream(const char *pathname,
Mutex &mutex)
{
ZZIP_FILE *_file = zzip_file_open(dir->dir, pathname, 0);
if (_file == nullptr) {
const auto error = (zzip_error_t)zzip_error(dir->dir);
switch (error) {
case ZZIP_ENOENT:
throw FormatFileNotFound("Failed to open '%s' in ZIP file",
pathname);
default:
throw FormatRuntimeError("Failed to open '%s' in ZIP file: %s",
pathname,
zzip_strerror(error));
}
}
return std::make_unique<ZzipInputStream>(dir, pathname,
mutex,
_file);
}
size_t
ZzipInputStream::Read(std::unique_lock<Mutex> &, void *ptr, size_t read_size)
{
const ScopeUnlock unlock(mutex);
zzip_ssize_t nbytes = zzip_file_read(file, ptr, read_size);
if (nbytes < 0)
throw std::runtime_error("zzip_file_read() has failed");
if (nbytes == 0 && !IsEOF())
throw FormatRuntimeError("Unexpected end of file %s"
" at %" PRIoffset " of %" PRIoffset,
GetURI(), GetOffset(), GetSize());
offset = zzip_tell(file);
return nbytes;
}
bool
ZzipInputStream::IsEOF() const noexcept
{
return offset_type(zzip_tell(file)) == size;
}
void
ZzipInputStream::Seek(std::unique_lock<Mutex> &, offset_type new_offset)
{
const ScopeUnlock unlock(mutex);
zzip_off_t ofs = zzip_seek(file, new_offset, SEEK_SET);
if (ofs < 0)
throw std::runtime_error("zzip_seek() has failed");
offset = ofs;
}
/* exported structures */
static constexpr const char *zzip_archive_extensions[] = {
"zip",
nullptr
};
const ArchivePlugin zzip_archive_plugin = {
"zzip",
nullptr,
nullptr,
zzip_archive_open,
zzip_archive_extensions,
};
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