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ZealOS/docs/Doc/RedSea.DD.html
TomAwezome 48d4f999cb Update documentation.
2021-12-11 06:10:58 -05:00

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<pre style="font-family:monospace;font-size:12pt">
<a name="l1"></a><span class=cF5> RedSea File System</span><span class=cF0>
<a name="l2"></a>
<a name="l3"></a>The RedSea file system is a simple, 64-bit, file system which is similar to FAT32, but with absolute block addresses instead
<a name="l4"></a>of clusters, fixed-sized 64-byte directory entries and no FAT table, just an allocation bitmap. A clus is just one 512 byte
<a name="l5"></a>sector. Files are stored in contiguous blocks and cannot grow in size.
<a name="l6"></a>
<a name="l7"></a>#</span><span class=cF1>define</span><span class=cF0> </span><span class=cF3>CDIR_FILENAME_LEN</span><span class=cF0> </span><span class=cFE>38</span><span class=cF0> </span><span class=cF2>//Must include terminator zero</span><span class=cF0>
<a name="l8"></a>
<a name="l9"></a>The following bit field shows valid </span><span class=cFE>8</span><span class=cF0>-Bit ASCII filename characters.
<a name="l10"></a>
<a name="l11"></a></span><span class=cF9>U32</span><span class=cF0> </span><span class=cFB>char_bmp_filename</span><span class=cF0>[</span><span class=cFE>8</span><span class=cF0>] = {</span><span class=cFE>0x0000000</span><span class=cF0>, </span><span class=cFE>0x03FF73FB</span><span class=cF0>, </span><span class=cFE>0xEFFFFFFF</span><span class=cF0>, </span><span class=cFE>0x2FFFFFFF</span><span class=cF0>, </span><span class=cFE>0xFFFFFFFF</span><span class=cF0>, </span><span class=cFE>0xFFFFFFFF</span><span class=cF0>, </span><span class=cFE>0xFFFFFFFF</span><span class=cF0>, </span><span class=cFE>0xFFFFFFFF</span><span class=cF0>};
<a name="l12"></a>
<a name="l13"></a></span><span class=cF1>public</span><span class=cF0> </span><span class=cF1>class</span><span class=cF0> </span><span class=cF9>CDirEntry</span><span class=cF0> </span><span class=cF2>//64-byte fixed-size</span><span class=cF0>
<a name="l14"></a>{
<a name="l15"></a> </span><span class=cF9>U16</span><span class=cF0> attr; </span><span class=cF2>//See </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KernelA.HH.html#l3187"><span class=cF4>RS_ATTR_DIR</span></a><span class=cF2>.</span><span class=cF0> </span><span class=cF2>Terry wanted to change these.</span><span class=cF0>
<a name="l16"></a> </span><span class=cF1>U8</span><span class=cF0> name[</span><span class=cF3>CDIR_FILENAME_LEN</span><span class=cF0>]; </span><span class=cF2>//See </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/StrA.ZC.html#l336"><span class=cF4>char_bmp_filename</span></a><span class=cF2>, </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/BlkDev/DiskStrA.ZC.html#l278"><span class=cF4>FileNameCheck</span></a><span class=cF0>
<a name="l17"></a> </span><span class=cF9>I64</span><span class=cF0> clus; </span><span class=cF7>(blk)</span><span class=cF0> </span><span class=cF2>//One sector per cluster.</span><span class=cF0>
<a name="l18"></a> </span><span class=cF9>I64</span><span class=cF0> size; </span><span class=cF2>//In bytes</span><span class=cF0>
<a name="l19"></a> </span><span class=cF9>CDate</span><span class=cF0> datetime; </span><span class=cF2>//See </span><a href="https://zeal-operating-system.github.io/ZealOS/Doc/TimeDate.DD.html#l1"><span class=cF4>DateTime</span></a><span class=cF2>, </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/KDate.ZC.html#l1"><span class=cF4>Implementation of DateTime</span></a><span class=cF0>
<a name="l20"></a>};
<a name="l21"></a>
<a name="l22"></a></span><span class=cF1>public</span><span class=cF0> </span><span class=cF1>class</span><span class=cF0> </span><span class=cF9>CRedSeaBoot</span><span class=cF0> </span><span class=cF2>//RedSea is type FAT32 in partition table to fool BIOS.</span><span class=cF0>
<a name="l23"></a>{
<a name="l24"></a> </span><span class=cF1>U8</span><span class=cF0> jump_and_nop[</span><span class=cFE>3</span><span class=cF0>];
<a name="l25"></a> </span><span class=cF1>U8</span><span class=cF0> signature, reserved[</span><span class=cFE>4</span><span class=cF0>]; </span><span class=cF2>//MBR_PT_REDSEA=0x88. Distinguish from real FAT32.</span><span class=cF0>
<a name="l26"></a> </span><span class=cF9>I64</span><span class=cF0> drv_offset; </span><span class=cF2>//For CD/DVD image copy.</span><span class=cF0>
<a name="l27"></a> </span><span class=cF9>I64</span><span class=cF0> sects;
<a name="l28"></a> </span><span class=cF9>I64</span><span class=cF0> root_clus; </span><span class=cF7>(root_blk)</span><span class=cF0>
<a name="l29"></a> </span><span class=cF9>I64</span><span class=cF0> bitmap_sects;
<a name="l30"></a> </span><span class=cF9>I64</span><span class=cF0> unique_id;
<a name="l31"></a> </span><span class=cF1>U8</span><span class=cF0> code[</span><span class=cFE>462</span><span class=cF0>];
<a name="l32"></a> </span><span class=cF9>U16</span><span class=cF0> signature2; </span><span class=cF2>//0xAA55</span><span class=cF0>
<a name="l33"></a>};
<a name="l34"></a>
<a name="l35"></a>See </span><a href="https://zeal-operating-system.github.io/ZealOS/Kernel/BlkDev/FileSysRedSea.ZC.html#l1"><span class=cF4>::/Kernel/BlkDev/FileSysRedSea.ZC</span></a><span class=cF0> and </span><a href="https://zeal-operating-system.github.io/ZealOS/System/Boot/DiskISORedSea.ZC.html#l1"><span class=cF4>::/System/Boot/DiskISORedSea.ZC</span></a><span class=cF0>.
<a name="l36"></a>
<a name="l37"></a>To replace ISO9660, make hard-drive partition image of a measured size and copy onto a CD/DVD starting at about sector 20,
<a name="l38"></a>with EL TORITO booting. 512-byte sectors will be placed on top of 2048-byte CD/DVD sectors, so there will be four blocks per
<a name="l39"></a>CD/DVD sector.
<a name="l40"></a>
<a name="l41"></a>RedSea file system has no bad block table and no redundant allocation table.
<a name="l42"></a>
<a name="l43"></a>See </span><a href="https://zeal-operating-system.github.io/ZealOS/Doc/BlkChain.DD.html#l1"><span class=cF4>Block Chain</span></a><span class=cF0> for RedSea allocation bitmap discussion.
<a name="l44"></a>
<a name="l45"></a>See </span><a href="https://zeal-operating-system.github.io/ZealOS/Doc/Reliability.DD.html#l1"><span class=cF4>Reliability</span></a><span class=cF0> for RedSea reliability discussion.
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