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Add ProDOS Date/Time packing utility functions

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michaelangel007 2025-02-04 08:39:06 -08:00
parent 0d7393d903
commit 566e5c6911
1 changed files with 33 additions and 1 deletions
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34
source/ProDOS_FileSystem.h
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@ -35,7 +35,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
const int PRODOS_MAX_PATH = 64; // TODO: Verify
const uint8_t ACCESS_D = 0x80; // Can destroy
const uint8_t ACCESS_N = 0x40; // Can rename
const uint8_t ACCESS_N = 0x40; // Can rename
const uint8_t ACCESS_B = 0x20; // Can backup
const uint8_t ACCESS_Z4= 0x10; // not used - must be zero?
const uint8_t ACCESS_Z3= 0x08; // not used - must be zero?
@ -135,10 +135,42 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
; //============
}; ; // 39 $27
// --- Prototypes ---
void ProDOS_GetFileHeader( uint8_t *pDiskBytes, int nOffset, ProDOS_FileHeader_t *pFileHeader_ );
// --- Date/Time ---
// | Byte 1 | Byte 0 | Bytes
// +-------------------------------+-------------------------------+
// | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Bits
// +---------------------------------------------------------------+
// <-----------Year-----------> <----Month----> <-------Day-------> Date
uint16_t ProDOS_PackDate ( int year, int month, int day )
{
uint16_t date = 0
| ((year & 0x7F) << 9)
| ((month & 0x0F) << 5)
| ((day & 0x1F) << 0)
;
return date;
}
// | Byte 1 | Byte 0 | Bytes
// +---------------------------------------------------------------+
// | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Bits
// +---------------------------------------------------------------+
// <----0----> <------Hours------> <--0--> <-------Minutes-------> Time
uint16_t ProDOS_PackTime (int hours, int minutes)
{
uint16_t time = 0
| ((hours & 0x1F) << 8)
| ((minutes & 0x3F) << 0)
;
return time;
}
// --- ProDOS Utility Byte Functions ---
// Helpers for 8 bit, 16-bit, 24-bit values