84 lines
6.3 KiB
HTML
Executable File
84 lines
6.3 KiB
HTML
Executable File
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<a name="l1"></a><span class=cF5> RedSea File System</span><span class=cF0>
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<a name="l2"></a>
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<a name="l3"></a>The RedSea file system is a simple, 64-bit, file system which is similar to
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<a name="l4"></a>FAT32, but with absolute block addresses instead of clus, fixed-sized 64-byte
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<a name="l5"></a>directory entries and no FAT table, just an allocation bitmap. A clus is just
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<a name="l6"></a>one 512 byte sector. Files are stored in contiguous blocks and cannot grow in
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<a name="l7"></a>size.
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<a name="l8"></a>
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<a name="l9"></a>#</span><span class=cF1>define</span><span class=cF0> </span><span class=cF3>CDIR_FILENAME_LEN</span><span class=cF0> 38 </span><span class=cF2>//Must include terminator zero</span><span class=cF0>
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<a name="l10"></a>
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<a name="l11"></a>The following bit field shows valid 8-Bit ASCII filename characters.
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<a name="l12"></a>
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<a name="l13"></a></span><span class=cF9>U32</span><span class=cF0> </span><span class=cFB>char_bmp_filename</span><span class=cF0>[8]=
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<a name="l14"></a>{0x0000000, 0x03FF73FB, 0xEFFFFFFF, 0x2FFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
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<a name="l15"></a>0xFFFFFFFF, 0xFFFFFFFF};
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<a name="l16"></a>
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<a name="l17"></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>
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<a name="l18"></a>{
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<a name="l19"></a> </span><span class=cF9>U16</span><span class=cF0> attr; </span><span class=cF2>//See </span><a href="/Wb/Kernel/KernelA.HH#l2501"><span class=cF4>RS_ATTR_DIR</span></a><span class=cF2>. I would like to change these.</span><span class=cF0>
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<a name="l20"></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="/Wb/Kernel/StrA.HC#l345"><span class=cF4>char_bmp_filename</span></a><span class=cF2>, </span><a href="/Wb/Kernel/BlkDev/DskStrA.HC#l249"><span class=cF4>FileNameChk</span></a><span class=cF0>
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<a name="l21"></a> </span><span class=cF9>I64</span><span class=cF0> clus; (blk) </span><span class=cF2>//One sector per clus.</span><span class=cF0>
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<a name="l22"></a> </span><span class=cF9>I64</span><span class=cF0> size; </span><span class=cF2>//In bytes</span><span class=cF0>
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<a name="l23"></a> </span><span class=cF9>CDate</span><span class=cF0> datetime; </span><span class=cF2>//See </span><a href="/Wb/Doc/TimeDate.DD.HTML#l1"><span class=cF4>DateTime</span></a><span class=cF2>, </span><a href="/Wb/Kernel/KDate.HC#l1"><span class=cF4>Implementation of DateTime</span></a><span class=cF0>
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<a name="l24"></a>};
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<a name="l25"></a>
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<a name="l26"></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>
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<a name="l27"></a>{
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<a name="l28"></a> </span><span class=cF1>U8</span><span class=cF0> jump_and_nop[3];
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<a name="l29"></a> </span><span class=cF1>U8</span><span class=cF0> signature,reserved[4]; </span><span class=cF2>//MBR_PT_REDSEA=0x88. Distinguish from real FAT32.</span><span class=cF0>
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<a name="l30"></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>
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<a name="l31"></a> </span><span class=cF9>I64</span><span class=cF0> sects;
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<a name="l32"></a> </span><span class=cF9>I64</span><span class=cF0> root_clus; (root_blk)
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<a name="l33"></a> </span><span class=cF9>I64</span><span class=cF0> bitmap_sects;
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<a name="l34"></a> </span><span class=cF9>I64</span><span class=cF0> unique_id;
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<a name="l35"></a> </span><span class=cF1>U8</span><span class=cF0> code[462];
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<a name="l36"></a> </span><span class=cF9>U16</span><span class=cF0> signature2; </span><span class=cF2>//0xAA55</span><span class=cF0>
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<a name="l37"></a>};
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<a name="l38"></a>
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<a name="l39"></a>See </span><a href="/Wb/Kernel/BlkDev/FileSysRedSea.HC#l1"><span class=cF4>::/Kernel/BlkDev/FileSysRedSea.HC</span></a><span class=cF0> and </span><a href="/Wb/Adam/Opt/Boot/DskISORedSea.HC#l1"><span class=cF4>::/Adam/Opt/Boot/DskISORedSea.HC</span></a><span class=cF0>.
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<a name="l40"></a>
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<a name="l41"></a>Files with names ending in .Z are compressed. See </span><a href="/Wb/Kernel/Compress.HC#l1"><span class=cF4>::/Kernel/Compress.HC</span></a><span class=cF0>.
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<a name="l42"></a>
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<a name="l43"></a>To replace ISO9660, make hard-drive partition image of a measured size and copy
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<a name="l44"></a>onto a CD/DVD starting at about sector 20, with EL TORITO booting. 512-byte
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<a name="l45"></a>sectors will be placed on top of 2048-byte CD/DCD sectors, so there will be four
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<a name="l46"></a>blocks per CD/DVD sector.
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<a name="l47"></a>
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<a name="l48"></a>RedSea file system has no bad block table and no redundant allocation table.
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<a name="l49"></a>
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<a name="l50"></a>See </span><a href="/Wb/Doc/BlkChain.DD.HTML#l1"><span class=cF4>Block Chain</span></a><span class=cF0> for RedSea allocation bitmap discussion.
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<a name="l51"></a>
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<a name="l52"></a>See </span><a href="/Wb/Doc/Reliability.DD.HTML#l1"><span class=cF4>Reliability</span></a><span class=cF0> for RedSea reliability discussion.
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</span></pre></body>
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