ZealOS/src/Doc/RedSea.DD

$WW,1$$FG,5$$TX+CX,"RedSea File System"$$FG$

The RedSea file system is a simple, 64-bit, file system which is similar to FAT32, but with absolute block addresses instead of clus, fixed-sized 64-byte directory entries and no FAT table, just an allocation bitmap.  A clus is just one 512 byte sector.  Files are stored in contiguous blocks and cannot grow in size.

$HL,1$#define CDIR_FILENAME_LEN	38 //Must include terminator zero

The following bit field shows valid 8-Bit ASCII filename characters.

U32 char_bmp_filename[8]=
{0x0000000, 0x03FF73FB, 0xEFFFFFFF, 0x2FFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF};

public class CDirEntry //64-byte fixed-size
{
  U16 attr;	//See $LK,"RS_ATTR_DIR",A="MN:RS_ATTR_DIR"$.  I would like to change these.
  U8 name[CDIR_FILENAME_LEN]; //See $LK,"char_bmp_filename",A="MN:char_bmp_filename"$, $LK,"FileNameCheck",A="MN:FileNameCheck"$
  I64 clus; (blk) //One sector per clus.
  I64 size;	//In bytes
  CDate datetime; //See  $LK,"DateTime",A="::/Doc/TimeDate.DD"$, $LK,"Implementation of DateTime",A="FI:::/Kernel/KDate.CC"$
};

public class CRedSeaBoot //RedSea is type FAT32 in partition table to fool BIOS.
{
  U8 jump_and_nop[3];
  U8 signature,reserved[4]; //MBR_PT_REDSEA=0x88. Distinguish from real FAT32.
  I64 drv_offset;	//For CD/DVD image copy.
  I64 sects;
  I64 root_clus; (root_blk)
  I64 bitmap_sects;
  I64 unique_id;
  U8 code[462];
  U16 signature2;	//0xAA55
};
$HL,0$
See $LK,"::/Kernel/BlkDev/FileSysRedSea.CC"$ and $LK,"::/Zenith/Boot/DiskISORedSea.CC"$.

Files with names ending in  are compressed.  See $LK,"::/Kernel/Compress.CC"$.

To replace ISO9660, make hard-drive partition image of a measured size and copy onto a CD/DVD starting at about sector 20, with EL TORITO booting.  512-byte sectors will be placed on top of 2048-byte CD/DCD sectors, so there will be four blocks per CD/DVD sector.

RedSea file system has no bad block table and no redundant allocation table.

See $LK,"Block Chain",A="FI:::/Doc/BlkChain.DD"$ for RedSea allocation bitmap discussion.

See $LK,"Reliability",A="FI:::/Doc/Reliability.DD"$ for RedSea reliability discussion.