Add support for single files compressed with zstd

BUG: 434540

plugins/libsinglefileplugin/CMakeLists.txt

@@ -92,5 +92,35 @@ if (LIBLZMA_FOUND)
     set(INSTALLED_LIBSINGLEFILE_PLUGINS "${INSTALLED_LIBSINGLEFILE_PLUGINS}kerfuffle_libxz;")
 endif (LIBLZMA_FOUND)
 
+#
+# Zstd files
+#
+
+# KArchive supports zstd since 5.82, KArchive_HAVE_ZSTD only available since 5.85
+if(KF5Archive_VERSION VERSION_GREATER_EQUAL "5.85.0")
+    set(HAVE_ZSTD ${KArchive_HAVE_ZSTD})
+else()
+    # repeat dependency check done by KArchive
+    find_package(PkgConfig)
+    pkg_check_modules(LibZstd IMPORTED_TARGET "libzstd")
+    set(HAVE_ZSTD ${LibZstd_FOUND})
+endif()
+
+if (HAVE_ZSTD)
+    set(kerfuffle_libzstd_SRCS zstdplugin.cpp ${kerfuffle_singlefile_SRCS})
+    set(SUPPORTED_LIBSINGLEFILE_MIMETYPES "${SUPPORTED_LIBSINGLEFILE_MIMETYPES}application/zstd;")
+
+    set(SUPPORTED_MIMETYPES "application/zstd")
+
+    configure_file(
+        ${CMAKE_CURRENT_SOURCE_DIR}/kerfuffle_libzstd.json.cmake
+        ${CMAKE_CURRENT_BINARY_DIR}/kerfuffle_libzstd.json)
+
+    kerfuffle_add_plugin(kerfuffle_libzstd ${kerfuffle_libzstd_SRCS})
+    target_link_libraries(kerfuffle_libzstd KF5::Archive)
+
+    set(INSTALLED_LIBSINGLEFILE_PLUGINS "${INSTALLED_LIBSINGLEFILE_PLUGINS}kerfuffle_libzstd;")
+endif (HAVE_ZSTD)
+
 set(SUPPORTED_ARK_MIMETYPES "${SUPPORTED_ARK_MIMETYPES}${SUPPORTED_LIBSINGLEFILE_MIMETYPES}" PARENT_SCOPE)
 set(INSTALLED_KERFUFFLE_PLUGINS "${INSTALLED_KERFUFFLE_PLUGINS}${INSTALLED_LIBSINGLEFILE_PLUGINS}" PARENT_SCOPE)

plugins/libsinglefileplugin/kerfuffle_libzstd.json.cmake

+{
+    "KPlugin": {
+        "Description": "Open and extract single files compressed with the zstd algorithm",
+        "Id": "kerfuffle_libzstd",
+        "MimeTypes": [
+            "@SUPPORTED_MIMETYPES@"
+        ],
+        "Name": "Zstd plugin",
+        "Version": "@RELEASE_SERVICE_VERSION@"
+    },
+    "X-KDE-Priority": 100
+}

plugins/libsinglefileplugin/zstdplugin.cpp

+/*
+ * Copyright (c) 2021  Friedrich W. H. Kossebau <kossebau@kde.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ( INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION ) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * ( INCLUDING NEGLIGENCE OR OTHERWISE ) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "zstdplugin.h"
+#include "kerfuffle_export.h"
+
+#include <QString>
+
+#include <KPluginFactory>
+
+K_PLUGIN_CLASS_WITH_JSON(LibZstdInterface, "kerfuffle_libzstd.json")
+
+LibZstdInterface::LibZstdInterface(QObject *parent, const QVariantList & args)
+        : LibSingleFileInterface(parent, args)
+{
+    m_mimeType = QStringLiteral( "application/zstd" );
+    m_possibleExtensions.append(QStringLiteral( ".zst" ));
+}
+
+LibZstdInterface::~LibZstdInterface()
+{
+}
+
+#include "zstdplugin.moc"

plugins/libsinglefileplugin/zstdplugin.h

+/*
+ * Copyright (c) 2021  Friedrich W. H. Kossebau <kossebau@kde.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ( INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION ) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * ( INCLUDING NEGLIGENCE OR OTHERWISE ) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ZSTDPLUGIN_H
+#define ZSTDPLUGIN_H
+
+#include "singlefileplugin.h"
+
+class KERFUFFLE_EXPORT LibZstdInterface : public LibSingleFileInterface
+{
+    Q_OBJECT
+
+public:
+    LibZstdInterface(QObject *parent, const QVariantList &args);
+    ~LibZstdInterface() override;
+};
+
+#endif // ZSTDPLUGIN_H