A TempleOS distro for heretics
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$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 $LK,"char_bmp_filename",A="MN:char_bmp_filename"$, $LK,"FileNameChk",A="MN:FileNameChk"$
I64 clus; (blk) //One sector per clus.
I64 size; //In bytes
CDate datetime; //See $LK,"DateTime",A="::/Doc/TimeDate.DD"$, $LK,"Implementation of DateTime",A="FI:::/Kernel/KDate.HC"$
};
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 $LK,"::/Kernel/BlkDev/FileSysRedSea.HC"$ and $LK,"::/Adam/Opt/Boot/DskISORedSea.HC"$.
Files with names ending in .Z are compressed. See $LK,"::/Kernel/Compress.HC"$.
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.