(svn r21160) -Codechange: reuse the strgen LanguageHeader to store some metadata about a language, and keep the language metadata in memory instead of loading it several times from disk

src/language.h

@@ -0,0 +1,59 @@
+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD 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, version 2.
+ * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file language.h Information about languages and their files. */
+
+#ifndef LANGUAGE_H
+#define LANGUAGE_H
+
+/** Header of a language file. */
+struct LanguagePackHeader {
+	static const uint32 IDENT = 0x474E414C; ///< Identifier for OpenTTD language files, big endian for "LANG"
+
+	uint32 ident;       ///< 32-bits identifier
+	uint32 version;     ///< 32-bits of auto generated version info which is basically a hash of strings.h
+	char name[32];      ///< the international name of this language
+	char own_name[32];  ///< the localized name of this language
+	char isocode[16];   ///< the ISO code for the language (not country code)
+	uint16 offsets[32]; ///< the offsets
+
+	/** Thousand separator used for anything not currencies */
+	char digit_group_separator[8];
+	/** Thousand separator used for currencies */
+	char digit_group_separator_currency[8];
+	/** Decimal separator */
+	char digit_decimal_separator[8];
+	byte plural_form;   ///< plural form index
+	byte text_dir;      ///< default direction of the text
+	/**
+	 * Windows language ID:
+	 * Windows cannot and will not convert isocodes to something it can use to
+	 * determine whether a font can be used for the language or not. As a result
+	 * of that we need to pass the language id via strgen to OpenTTD to tell
+	 * what language it is in "Windows". The ID is the 'locale identifier' on:
+	 *   http://msdn.microsoft.com/en-us/library/ms776294.aspx
+	 */
+	uint16 winlangid;   ///< windows language id
+	uint8 newgrflangid; ///< newgrf language id
+	byte pad[3];        ///< pad header to be a multiple of 4
+
+	/**
+	 * Check whether the header is a valid header for OpenTTD.
+	 * @return true iff the header is deemed valid.
+	 */
+	bool IsValid() const;
+};
+assert_compile(sizeof(LanguagePackHeader) % 4 == 0);
+
+/** Metadata about a single language. */
+struct LanguageMetadata : public LanguagePackHeader {
+	char file[MAX_PATH]; ///< Name of the file we read this data from.
+};
+
+#endif /* LANGUAGE_H */