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/*
* Copyright (C) 2003-2015 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 "config.h"
#include "Bzip2ArchivePlugin.hxx"
#include "../ArchivePlugin.hxx"
#include "../ArchiveFile.hxx"
#include "../ArchiveVisitor.hxx"
#include "input/InputStream.hxx"
#include "input/InputPlugin.hxx"
#include "input/LocalOpen.hxx"
#include "util/RefCount.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "fs/Traits.hxx"
#include "fs/Path.hxx"
#include <bzlib.h>
#include <stddef.h>
#ifdef HAVE_OLDER_BZIP2
#define BZ2_bzDecompressInit bzDecompressInit
#define BZ2_bzDecompress bzDecompress
#endif
class Bzip2ArchiveFile final : public ArchiveFile {
public:
RefCount ref;
std::string name;
InputStream *const istream;
Bzip2ArchiveFile(Path path, InputStream *_is)
:ArchiveFile(bz2_archive_plugin),
name(path.GetBase().c_str()),
istream(_is) {
// remove .bz2 suffix
const size_t len = name.length();
if (len > 4)
name.erase(len - 4);
}
~Bzip2ArchiveFile() {
delete istream;
}
void Ref() {
ref.Increment();
}
void Unref() {
if (!ref.Decrement())
return;
delete this;
}
virtual void Close() override {
Unref();
}
virtual void Visit(ArchiveVisitor &visitor) override {
visitor.VisitArchiveEntry(name.c_str());
}
virtual InputStream *OpenStream(const char *path,
Mutex &mutex, Cond &cond,
Error &error) override;
};
struct Bzip2InputStream final : public InputStream {
Bzip2ArchiveFile *archive;
bool eof;
bz_stream bzstream;
char buffer[5000];
Bzip2InputStream(Bzip2ArchiveFile &context, const char *uri,
Mutex &mutex, Cond &cond);
~Bzip2InputStream();
bool Open(Error &error);
/* virtual methods from InputStream */
bool IsEOF() override;
size_t Read(void *ptr, size_t size, Error &error) override;
};
static constexpr Domain bz2_domain("bz2");
/* single archive handling allocation helpers */
inline bool
Bzip2InputStream::Open(Error &error)
{
bzstream.bzalloc = nullptr;
bzstream.bzfree = nullptr;
bzstream.opaque = nullptr;
bzstream.next_in = (char *)buffer;
bzstream.avail_in = 0;
int ret = BZ2_bzDecompressInit(&bzstream, 0, 0);
if (ret != BZ_OK) {
error.Set(bz2_domain, ret,
"BZ2_bzDecompressInit() has failed");
return false;
}
SetReady();
return true;
}
/* archive open && listing routine */
static ArchiveFile *
bz2_open(Path pathname, Error &error)
{
static Mutex mutex;
static Cond cond;
InputStream *is = OpenLocalInputStream(pathname, mutex, cond, error);
if (is == nullptr)
return nullptr;
return new Bzip2ArchiveFile(pathname, is);
}
/* single archive handling */
Bzip2InputStream::Bzip2InputStream(Bzip2ArchiveFile &_context,
const char *_uri,
Mutex &_mutex, Cond &_cond)
:InputStream(_uri, _mutex, _cond),
archive(&_context), eof(false)
{
archive->Ref();
}
Bzip2InputStream::~Bzip2InputStream()
{
BZ2_bzDecompressEnd(&bzstream);
archive->Unref();
}
InputStream *
Bzip2ArchiveFile::OpenStream(const char *path,
Mutex &mutex, Cond &cond,
Error &error)
{
Bzip2InputStream *bis = new Bzip2InputStream(*this, path, mutex, cond);
if (!bis->Open(error)) {
delete bis;
return nullptr;
}
return bis;
}
static bool
bz2_fillbuffer(Bzip2InputStream *bis, Error &error)
{
size_t count;
bz_stream *bzstream;
bzstream = &bis->bzstream;
if (bzstream->avail_in > 0)
return true;
count = bis->archive->istream->Read(bis->buffer, sizeof(bis->buffer),
error);
if (count == 0)
return false;
bzstream->next_in = bis->buffer;
bzstream->avail_in = count;
return true;
}
size_t
Bzip2InputStream::Read(void *ptr, size_t length, Error &error)
{
int bz_result;
size_t nbytes = 0;
if (eof)
return 0;
bzstream.next_out = (char *)ptr;
bzstream.avail_out = length;
do {
if (!bz2_fillbuffer(this, error))
return 0;
bz_result = BZ2_bzDecompress(&bzstream);
if (bz_result == BZ_STREAM_END) {
eof = true;
break;
}
if (bz_result != BZ_OK) {
error.Set(bz2_domain, bz_result,
"BZ2_bzDecompress() has failed");
return 0;
}
} while (bzstream.avail_out == length);
nbytes = length - bzstream.avail_out;
offset += nbytes;
return nbytes;
}
bool
Bzip2InputStream::IsEOF()
{
return eof;
}
/* exported structures */
static const char *const bz2_extensions[] = {
"bz2",
nullptr
};
const ArchivePlugin bz2_archive_plugin = {
"bz2",
nullptr,
nullptr,
bz2_open,
bz2_extensions,
};
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