archive/*: move to archive/plugins/

src/archive/plugins/Bzip2ArchivePlugin.cxx

@@ -0,0 +1,292 @@
+/*
+ * Copyright (C) 2003-2014 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 "InputStream.hxx"
+#include "InputPlugin.hxx"
+#include "util/RefCount.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "fs/Traits.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(const char *path, InputStream *_is)
+		:ArchiveFile(bz2_archive_plugin),
+		 name(PathTraitsUTF8::GetBase(path)),
+		 istream(_is) {
+		// remove .bz2 suffix
+		const size_t len = name.length();
+		if (len > 4)
+			name.erase(len - 4);
+	}
+
+	~Bzip2ArchiveFile() {
+		istream->Close();
+	}
+
+	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 {
+	InputStream base;
+
+	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);
+	void Close();
+};
+
+extern const InputPlugin bz2_inputplugin;
+
+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;
+	}
+
+	base.ready = true;
+	return true;
+}
+
+inline void
+Bzip2InputStream::Close()
+{
+	BZ2_bzDecompressEnd(&bzstream);
+}
+
+/* archive open && listing routine */
+
+static ArchiveFile *
+bz2_open(const char *pathname, Error &error)
+{
+	static Mutex mutex;
+	static Cond cond;
+	InputStream *is = InputStream::OpenReady(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)
+	:base(bz2_inputplugin, uri, mutex, cond),
+	 archive(&_context), eof(false)
+{
+	archive->Ref();
+}
+
+Bzip2InputStream::~Bzip2InputStream()
+{
+	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->base;
+}
+
+static void
+bz2_is_close(InputStream *is)
+{
+	Bzip2InputStream *bis = (Bzip2InputStream *)is;
+
+	bis->Close();
+	delete 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;
+}
+
+static size_t
+bz2_is_read(InputStream *is, void *ptr, size_t length,
+	    Error &error)
+{
+	Bzip2InputStream *bis = (Bzip2InputStream *)is;
+	bz_stream *bzstream;
+	int bz_result;
+	size_t nbytes = 0;
+
+	if (bis->eof)
+		return 0;
+
+	bzstream = &bis->bzstream;
+	bzstream->next_out = (char *)ptr;
+	bzstream->avail_out = length;
+
+	do {
+		if (!bz2_fillbuffer(bis, error))
+			return 0;
+
+		bz_result = BZ2_bzDecompress(bzstream);
+
+		if (bz_result == BZ_STREAM_END) {
+			bis->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;
+	is->offset += nbytes;
+
+	return nbytes;
+}
+
+static bool
+bz2_is_eof(InputStream *is)
+{
+	Bzip2InputStream *bis = (Bzip2InputStream *)is;
+
+	return bis->eof;
+}
+
+/* exported structures */
+
+static const char *const bz2_extensions[] = {
+	"bz2",
+	nullptr
+};
+
+const InputPlugin bz2_inputplugin = {
+	nullptr,
+	nullptr,
+	nullptr,
+	nullptr,
+	bz2_is_close,
+	nullptr,
+	nullptr,
+	nullptr,
+	nullptr,
+	bz2_is_read,
+	bz2_is_eof,
+	nullptr,
+};
+
+const struct archive_plugin bz2_archive_plugin = {
+	"bz2",
+	nullptr,
+	nullptr,
+	bz2_open,
+	bz2_extensions,
+};
+