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bdk: fatfs: better PrFILE2 SAFE record creation

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CTCaer 2022-01-29 01:40:05 +02:00
parent 4a13a1d190
commit 6666dd4b46
1 changed files with 19 additions and 7 deletions
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16
bdk/libs/fatfs/ff.c
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@ -6228,8 +6228,13 @@ FRESULT f_mkfs (
mem_set(buf, 0, ss);
st_dword(buf + FSI_LeadSig, 0x41615252);
st_dword(buf + FSI_StrucSig, 0x61417272);
if (opt & FM_PRF2) {
st_dword(buf + FSI_Free_Count, 0xFFFFFFFF); /* Invalidate free count */
st_dword(buf + FSI_Nxt_Free, 0xFFFFFFFF); /* Invalidate last allocated cluster */
} else {
st_dword(buf + FSI_Free_Count, n_clst - 1); /* Number of free clusters */
st_dword(buf + FSI_Nxt_Free, 2); /* Last allocated cluster# */
}
st_word(buf + BS_55AA, 0xAA55);
disk_write(pdrv, buf, b_vol + 7, 1); /* Write backup FSINFO (VBR + 7) */
disk_write(pdrv, buf, b_vol + 1, 1); /* Write original FSINFO (VBR + 1) */
@ -6238,10 +6243,17 @@ FRESULT f_mkfs (
/* Create PRF2SAFE info */
if (fmt == FS_FAT32 && opt & FM_PRF2) {
mem_set(buf, 0, ss);
st_dword(buf + 0, 0x32465250); /* Magic PRF2 */
st_dword(buf + 4, 0x45464153); /* Magic SAFE */
buf[16] = 0x64; /* Record type */
st_dword(buf + 32, 0x03); /* Unknown. SYSTEM: 0x3F00. USER: 0x03. Volatile. */
st_dword(buf + 36, 25); /* Entries. SYSTEM: 22. USER: 25.Static? */
st_dword(buf + 508, 0x517BBFE0); /* Custom CRC32. SYSTEM: 0x6B673904. USER: 0x517BBFE0. */
if (sz_vol < 0x1000000) {
st_dword(buf + 36, 21 + 1); /* 22 Entries. */
st_dword(buf + 508, 0x90BB2F39); /* Sector CRC32 */
} else {
st_dword(buf + 36, 21 + 2); /* 23 Entries. */
st_dword(buf + 508, 0x5EA8AFC8); /* Sector CRC32 */
}
disk_write(pdrv, buf, b_vol + 3, 1); /* Write PRF2SAFE info (VBR + 3) */
}