@@ -278,6 +278,12 @@ typedef struct {
278278
279279
280280/* SBCS up-case tables (\x80-\xFF) */
281+ // Optimize the 437-only case with a truncated lookup table.
282+ #if FF_CODE_PAGE == 437
283+ #define TBL_CT437 {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
284+ 0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
285+ 0x41,0x49,0x4F,0x55,0xA5}
286+ #else
281287#define TBL_CT437 {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
282288 0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
283289 0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
@@ -286,6 +292,7 @@ typedef struct {
286292 0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
287293 0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
288294 0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
295+ #endif
289296#define TBL_CT720 {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
290297 0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
291298 0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
@@ -2887,7 +2894,12 @@ static FRESULT create_name ( /* FR_OK: successful, FR_INVALID_NAME: could not
28872894 }
28882895#elif FF_CODE_PAGE < 900 /* SBCS cfg */
28892896 wc = ff_uni2oem (wc , CODEPAGE ); /* Unicode ==> ANSI/OEM code */
2897+ // Optimize the 437-only case with a truncated lookup table.
2898+ #if FF_CODE_PAGE == 437
2899+ if (wc & 0x80 && wc < (0xA5 - 0x80 )) wc = ExCvt [wc & 0x7F ]; /* Convert extended character to upper (SBCS) */
2900+ #else
28902901 if (wc & 0x80 ) wc = ExCvt [wc & 0x7F ]; /* Convert extended character to upper (SBCS) */
2902+ #endif
28912903#else /* DBCS cfg */
28922904 wc = ff_uni2oem (ff_wtoupper (wc ), CODEPAGE ); /* Unicode ==> Upper convert ==> ANSI/OEM code */
28932905#endif
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