FAT file system-read＆set

read sector number ThisFATSecNum (remember this is a sector number relative to sector 0 of the FAT volume). Assume this is read into an 8-bit byte array named SecBuff

If(FATType == FAT16)     FAT16ClusEntryVal = *((WORD *) &SecBuff[ThisFATEntOffset]); Else     FAT32ClusEntryVal = (*((DWORD *) &SecBuff[ThisFATEntOffset])) & 0x0FFFFFFF;

set the contents of this same cluster

If(FATType == FAT16)     *((WORD *) &SecBuff[ThisFATEntOffset]) = FAT16ClusEntryVal; Else {      FAT32ClusEntryVal = FAT32ClusEntryVal & 0x0FFFFFFF;     *((DWORD *) &SecBuff[ThisFATEntOffset]) =         (*((DWORD *) &SecBuff[ThisFATEntOffset])) & 0xF0000000;     *((DWORD *) &SecBuff[ThisFATEntOffset]) =         (*((DWORD *) &SecBuff[ThisFATEntOffset])) | FAT32ClusEntryVal; }