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Limit FatFs' ability to upper case paths

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Only uppercase ASCII letters a-z. This saves ~900 bytes. Previously
written files with other unicode letters will only be accessible
from their upper cased path.
This commit is contained in:
Scott Shawcroft 2023-02-23 14:28:58 -08:00
parent de5f58a61d
commit 1a3358d036
No known key found for this signature in database
GPG Key ID: 0DFD512649C052DA
3 changed files with 22 additions and 0 deletions
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12
lib/oofatfs/ff.c
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@ -278,6 +278,12 @@ typedef struct {
/* SBCS up-case tables (\x80-\xFF) */
// Optimize the 437-only case with a truncated lookup table.
#if FF_CODE_PAGE == 437
#define TBL_CT437 {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0x41,0x49,0x4F,0x55,0xA5}
#else
#define TBL_CT437 {0x80,0x9A,0x45,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F, \
0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF, \
@ -286,6 +292,7 @@ typedef struct {
0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, \
0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}
#endif
#define TBL_CT720 {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F, \
0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
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
}
#elif FF_CODE_PAGE < 900 /* SBCS cfg */
wc = ff_uni2oem(wc, CODEPAGE); /* Unicode ==> ANSI/OEM code */
// Optimize the 437-only case with a truncated lookup table.
#if FF_CODE_PAGE == 437
if (wc & 0x80 && wc < (0xA5 - 0x80)) wc = ExCvt[wc & 0x7F]; /* Convert extended character to upper (SBCS) */
#else
if (wc & 0x80) wc = ExCvt[wc & 0x7F]; /* Convert extended character to upper (SBCS) */
#endif
#else /* DBCS cfg */
wc = ff_uni2oem(ff_wtoupper(wc), CODEPAGE); /* Unicode ==> Upper convert ==> ANSI/OEM code */
#endif

8
lib/oofatfs/ffunicode.c
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@ -499,6 +499,13 @@ DWORD ff_wtoupper ( /* Returns up-converted code point */
DWORD uni /* Unicode code point to be up-converted */
)
{
#if FF_FS_ASCII_UPPER_ONLY
// Only uppercase ASCII characters. Everything else will require the user to
// pass in an uppercase version.
if ('a' <= uni && uni <= 'z') {
uni -= 32;
}
#else
const WORD *p;
WORD uc, bc, nc, cmd;
static const WORD cvt1[] = { /* Compressed up conversion table for U+0000 - U+0FFF */
@ -619,6 +626,7 @@ DWORD ff_wtoupper ( /* Returns up-converted code point */
}
uni = uc;
}
#endif
return uni;
}

2
py/circuitpy_mpconfig.h
View File

@ -594,6 +594,8 @@ void supervisor_run_background_tasks_if_tick(void);
#define CIRCUITPY_DIGITALIO_HAVE_INVALID_DRIVE_MODE (0)
#endif
#define FF_FS_ASCII_UPPER_ONLY (1)
#define FF_FS_MAKE_VOLID (1)
#define MICROPY_PY_OPTIMIZE_PROPERTY_FLASH_SIZE (CIRCUITPY_OPTIMIZE_PROPERTY_FLASH_SIZE)