(svn r23585) -Codechange: replace some magic numbers with less magic constants

5 files changed, 31 insertions, 26 deletions

diff --git a/src/language.h b/src/language.h
index a6797ed2f..694b0ca1b 100644
--- a/src/language.h
+++ b/src/language.h
@@ -21,6 +21,13 @@ static const uint8 CASE_GENDER_LEN = 16; ///< The (maximum) length of a case/gen
 static const uint8 MAX_NUM_GENDERS =  8; ///< Maximum number of supported genders.
 static const uint8 MAX_NUM_CASES   = 16; ///< Maximum number of supported cases.
 
+static const uint TAB_SIZE_OFFSET  = 0;                   ///< The offset for the tab size.
+static const uint TAB_SIZE_BITS    = 11;                  ///< The number of bits used for the tab size.
+static const uint TAB_SIZE         = 1 << TAB_SIZE_BITS;  ///< The number of values in a tab.
+static const uint TAB_COUNT_OFFSET = TAB_SIZE_BITS;       ///< The offset for the tab count.
+static const uint TAB_COUNT_BITS   = 5;                   ///< The number of bits used for the amount of tabs.
+static const uint TAB_COUNT        = 1 << TAB_COUNT_BITS; ///< The amount of tabs.
+
 /** Header of a language file. */
 struct LanguagePackHeader {
 	static const uint32 IDENT = 0x474E414C; ///< Identifier for OpenTTD language files, big endian for "LANG"
@@ -30,7 +37,7 @@ struct LanguagePackHeader {
 	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
+	uint16 offsets[TAB_COUNT]; ///< the offsets
 
 	/** Thousand separator used for anything not currencies */
 	char digit_group_separator[8];
diff --git a/src/strgen/strgen.cpp b/src/strgen/strgen.cpp
index 4ca02a1a7..0b40e02c4 100644
--- a/src/strgen/strgen.cpp
+++ b/src/strgen/strgen.cpp
@@ -529,7 +529,7 @@ int CDECL main(int argc, char *argv[])
 			mkpath(pathbuf, lengthof(pathbuf), src_dir, "english.txt");
 
 			/* parse master file */
-			StringData data;
+			StringData data(TAB_COUNT);
 			FileStringReader master_reader(data, pathbuf, true, false);
 			master_reader.ParseFile();
 			if (_errors != 0) return 1;
@@ -546,7 +546,7 @@ int CDECL main(int argc, char *argv[])
 
 			mkpath(pathbuf, lengthof(pathbuf), src_dir, "english.txt");
 
-			StringData data;
+			StringData data(TAB_COUNT);
 			/* parse master file and check if target file is correct */
 			FileStringReader master_reader(data, pathbuf, true, false);
 			master_reader.ParseFile();
diff --git a/src/strgen/strgen.h b/src/strgen/strgen.h
index b3584ab5f..e44c5be42 100644
--- a/src/strgen/strgen.h
+++ b/src/strgen/strgen.h
@@ -39,15 +39,13 @@ struct LangString {
 
 /** Information about the currently known strings. */
 struct StringData {
-	static const uint STRINGS_IN_TAB = 2048;
-
 	LangString **strings; ///< Array of all known strings.
 	uint16 *hash_heads;   ///< Hash table for the strings.
 	size_t tabs;          ///< The number of 'tabs' of strings.
 	size_t max_strings;   ///< The maxmimum number of strings.
 	int next_string_id;   ///< The next string ID to allocate.
 
-	StringData(size_t tabs = 32);
+	StringData(size_t tabs);
 	~StringData();
 	void FreeTranslation();
 	uint HashStr(const char *s) const;
@@ -134,8 +132,8 @@ struct LanguageWriter {
 	/** Especially destroy the subclasses. */
 	virtual ~LanguageWriter() {}
 
-	void WriteLength(uint length);
-	void WriteLang(const StringData &data);
+	virtual void WriteLength(uint length);
+	virtual void WriteLang(const StringData &data);
 };
 
 void CDECL strgen_warning(const char *s, ...) WARN_FORMAT(1, 2);
diff --git a/src/strgen/strgen_base.cpp b/src/strgen/strgen_base.cpp
index 98e5aefb1..5563de31e 100644
--- a/src/strgen/strgen_base.cpp
+++ b/src/strgen/strgen_base.cpp
@@ -89,7 +89,7 @@ void LangString::FreeTranslation()
  * Create a new string data container.
  * @param max_strings The maximum number of strings.
  */
-StringData::StringData(size_t tabs) : tabs(tabs), max_strings(tabs * STRINGS_IN_TAB)
+StringData::StringData(size_t tabs) : tabs(tabs), max_strings(tabs * TAB_SIZE)
 {
 	this->strings = CallocT<LangString *>(max_strings);
 	this->hash_heads = CallocT<uint16>(max_strings);
@@ -215,7 +215,7 @@ uint StringData::Version() const
 uint StringData::CountInUse(uint tab) const
 {
 	int i;
-	for (i = STRINGS_IN_TAB; --i >= 0;) if (this->strings[(tab * STRINGS_IN_TAB) + i] != NULL) break;
+	for (i = TAB_SIZE; --i >= 0;) if (this->strings[(tab * TAB_SIZE) + i] != NULL) break;
 	return i + 1;
 }
 
@@ -938,7 +938,7 @@ void LanguageWriter::WriteLang(const StringData &data)
 		_lang.offsets[tab] = TO_LE16(n);
 
 		for (uint j = 0; j != in_use[tab]; j++) {
-			const LangString *ls = data.strings[(tab * StringData::STRINGS_IN_TAB) + j];
+			const LangString *ls = data.strings[(tab * TAB_SIZE) + j];
 			if (ls != NULL && ls->translated == NULL) _lang.missing++;
 		}
 	}
@@ -953,7 +953,7 @@ void LanguageWriter::WriteLang(const StringData &data)
 
 	for (size_t tab = 0; tab < data.tabs; tab++) {
 		for (uint j = 0; j != in_use[tab]; j++) {
-			const LangString *ls = data.strings[(tab * StringData::STRINGS_IN_TAB) + j];
+			const LangString *ls = data.strings[(tab * TAB_SIZE) + j];
 			const Case *casep;
 			const char *cmdp;
 
diff --git a/src/strings.cpp b/src/strings.cpp
index 3bcd21d1e..af6b3bb78 100644
--- a/src/strings.cpp
+++ b/src/strings.cpp
@@ -132,20 +132,20 @@ struct LanguagePack : public LanguagePackHeader {
 
 static char **_langpack_offs;
 static LanguagePack *_langpack;
-static uint _langtab_num[32];   ///< Offset into langpack offs
-static uint _langtab_start[32]; ///< Offset into langpack offs
+static uint _langtab_num[TAB_COUNT];   ///< Offset into langpack offs
+static uint _langtab_start[TAB_COUNT]; ///< Offset into langpack offs
 static bool _keep_gender_data = false;  ///< Should we retain the gender data in the current string?
 
 
 const char *GetStringPtr(StringID string)
 {
-	switch (GB(string, 11, 5)) {
+	switch (GB(string, TAB_COUNT_OFFSET, TAB_COUNT_BITS)) {
 		/* GetGRFStringPtr doesn't handle 0xD4xx ids, we need to convert those to 0xD0xx. */
-		case 26: return GetStringPtr(GetGRFStringID(0, 0xD000 + GB(string, 0, 10)));
-		case 28: return GetGRFStringPtr(GB(string, 0, 11));
-		case 29: return GetGRFStringPtr(GB(string, 0, 11) + 0x0800);
-		case 30: return GetGRFStringPtr(GB(string, 0, 11) + 0x1000);
-		default: return _langpack_offs[_langtab_start[string >> 11] + (string & 0x7FF)];
+		case 26: return GetStringPtr(GetGRFStringID(0, 0xD000 + GB(string, TAB_SIZE_OFFSET, 10)));
+		case 28: return GetGRFStringPtr(GB(string, TAB_SIZE_OFFSET, TAB_SIZE_BITS));
+		case 29: return GetGRFStringPtr(GB(string, TAB_SIZE_OFFSET, TAB_SIZE_BITS) + 0x0800);
+		case 30: return GetGRFStringPtr(GB(string, TAB_SIZE_OFFSET, TAB_SIZE_BITS) + 0x1000);
+		default: return _langpack_offs[_langtab_start[GB(string, TAB_COUNT_OFFSET, TAB_COUNT_BITS)] + GB(string, TAB_SIZE_OFFSET, TAB_SIZE_BITS)];
 	}
 }
 
@@ -162,8 +162,8 @@ char *GetStringWithArgs(char *buffr, StringID string, StringParameters *args, co
 {
 	if (string == 0) return GetStringWithArgs(buffr, STR_UNDEFINED, args, last);
 
-	uint index = GB(string,  0, 11);
-	uint tab   = GB(string, 11,  5);
+	uint index = GB(string, TAB_SIZE_OFFSET,  TAB_SIZE_BITS);
+	uint tab   = GB(string, TAB_COUNT_OFFSET, TAB_COUNT_BITS);
 
 	switch (tab) {
 		case 4:
@@ -1536,13 +1536,13 @@ bool ReadLanguagePack(const LanguageMetadata *lang)
 	}
 
 #if TTD_ENDIAN == TTD_BIG_ENDIAN
-	for (uint i = 0; i < 32; i++) {
+	for (uint i = 0; i < TAB_COUNT; i++) {
 		lang_pack->offsets[i] = ReadLE16Aligned(&lang_pack->offsets[i]);
 	}
 #endif /* TTD_ENDIAN == TTD_BIG_ENDIAN */
 
 	uint count = 0;
-	for (uint i = 0; i < 32; i++) {
+	for (uint i = 0; i < TAB_COUNT; i++) {
 		uint num = lang_pack->offsets[i];
 		_langtab_start[i] = count;
 		_langtab_num[i] = num;
@@ -1849,12 +1849,12 @@ class LanguagePackGlyphSearcher : public MissingGlyphSearcher {
 
 	/* virtual */ const char *NextString()
 	{
-		if (this->i >= 32) return NULL;
+		if (this->i >= TAB_COUNT) return NULL;
 
 		const char *ret = _langpack_offs[_langtab_start[i] + j];
 
 		this->j++;
-		while (this->j >= _langtab_num[this->i] && this->i < 32) {
+		while (this->j >= _langtab_num[this->i] && this->i < TAB_COUNT) {
 			i++;
 			j = 0;
 		}