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engines/got/utils/res_archive.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef GOT_UTILS_RES_ARCHIVE_H
+#define GOT_UTILS_RES_ARCHIVE_H
+
+#include "common/archive.h"
+#include "common/stream.h"
+
+namespace Got {
+
+struct ResHeader {
+    Common::String _name;
+    uint32 _offset = 0;
+    uint32 _size = 0;
+    uint32 _originalSize = 0;
+    int _key = 0;
+
+    void load(Common::SeekableReadStream *src);
+};
+
+#define RES_MAX_ENTRIES 256  // Max # of elements
+#define RES_HEADER_ENTRY_SIZE 23	// Size of a single header entry
+class ResArchive : public Common::Archive {
+private:
+    Common::Array<ResHeader> _headers;
+
+    /**
+     * Decrypts a passed buffer
+     * @param buf	Pointer to buffer
+     * @param len	Buffer size
+     * @param key	Starting key to use for decryption
+     */
+    void decrypt(byte *buf, size_t len, byte key) const;
+
+    /**
+     * Decodes a passed buffer
+     */
+    void lzssDecompress(const byte *src, byte *dest) const;
+
+    /**
+     * Returns the index of a header for a given filename
+    */
+    int indexOf(const Common::String &name) const;
+
+public:
+    /**
+     * Constructor
+     */
+    ResArchive();
+
+    /**
+     * Check if a member with the given name is present in the Archive.
+     * Patterns are not allowed, as this is meant to be a quick File::exists()
+     * replacement.
+     */
+    bool hasFile(const Common::Path &path) const override;
+
+    /**
+     * Add all members of the Archive to list.
+     * Must only append to list, and not remove elements from it.
+     *
+     * @return the number of names added to list
+     */
+    int listMembers(Common::ArchiveMemberList &list) const override;
+
+    /**
+     * Returns a ArchiveMember representation of the given file.
+     */
+    const Common::ArchiveMemberPtr getMember(const Common::Path &path) const override;
+
+    /**
+     * Create a stream bound to a member with the specified name in the
+     * archive. If no member with this name exists, 0 is returned.
+     * @return the newly created input stream
+     */
+    Common::SeekableReadStream *createReadStreamForMember(const Common::Path &path) const override;
+};
+
+extern void resInit();
+
+} // namespace Got
+
+#endif