250 lines
14 KiB
HTML
250 lines
14 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Int 1A/AX=B001h/CX=4D52h
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 1A/AX=B001h/CX=4D52h - Microsoft Real-Time Compression Interface (MRCI) - ROM-BASED SERVER -
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AX = B001h
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CX = 4D52h (MR)
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DX = 4349h (CI)
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Return: CX = 4943h (IC) if installed
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DX = 524Dh (RM) if installed
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ES:DI - MRCINFO structure (see #00725)
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Note: this call is functionally identical to INT 2F/AX=4A12h, which should
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be called first, as this call is used for the first, ROM-based
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MRCI server, while the other call is used for RAM-based servers
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which may be partially or entirely replacing a prior server
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">
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<META NAME="robots" CONTENT="none">
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</HEAD>
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<BODY BGCOLOR="#FFD0A0">
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<center>
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<h2>Int 1A/AX=B001h/CX=4D52h
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</h2>
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</center><p>
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<td><a href="int.htm" tppabs="http://www.ctyme.com/intr/int.htm">Interrups</a></td>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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<p><img src="rbline.gif" tppabs="http://graphics.ctyme.com/gif/rbline.gif" width="100%" alt="------"><p>
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<h3><font color=#C00040>Microsoft Real-Time Compression Interface (MRCI) - ROM-BASED SERVER</font></h3>
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<PRE>
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AX = B001h
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CX = 4D52h ("MR")
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DX = 4349h ("CI")<br>
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<p><b>Return:</b><br>CX = 4943h ("IC") if installed
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DX = 524Dh ("RM") if installed
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ES:DI -> MRCINFO structure <a href="rb-2370.htm#Table725" tppabs="http://www.ctyme.com/intr/rb-2370.htm#Table725">(see #00725)</a>
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</PRE>
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<p><b>Note:</b>
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This call is functionally identical to INT 2F/AX=4A12h, which should
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be called first, as this call is used for the first, ROM-based
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MRCI server, while the other call is used for RAM-based servers
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which may be partially or entirely replacing a prior server
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<p><b>See Also:</b>
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<a href="rb-4849.htm" tppabs="http://www.ctyme.com/intr/rb-4849.htm">INT 2F/AX=4A12h</a>
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<PRE>
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<p>
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Format of MRCINFO structure:
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<a name=table725></a>
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Offset Size Description (Table 00725)
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00h 4 BYTEs vendor signature
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"MSFT" Microsoft
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04h WORD server version (high=major)
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06h WORD MRCI specification version
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08h DWORD address of server entry point <a href="rb-2370.htm#Table727" tppabs="http://www.ctyme.com/intr/rb-2370.htm#Table727">(see #00727)</a>
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<p><b>0Ch WORD bit flags:</b><br>Server capabilities (see #00726)
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<p><b>0Eh WORD bit flags:</b><br>Hardware assisted capabilities (see #00726)
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10h WORD maximum block size supported by server (at least 8192 bytes)
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<p>
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Bitfields for MRCI capabilities:
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<a name=table726></a>
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Bit(s) Description (Table 00726)
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0 standard compress
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1 standard decompress
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2 update compress
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3 MaxCompress (not present in initial public release)
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4 reserved
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5 incremental decompress
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6 MRCI 2.0 standard compress
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7 MRCI 2.0 standard decompress
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8-14 reserved
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15 this structure is in ROM and can't be modified.
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(server capabilities only)
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<p>
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<a name=table727></a>
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(Table 00727)
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Call MRCI entry point with:.
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DS:SI -> MRCREQUEST structure <a href="rb-2370.htm#Table728" tppabs="http://www.ctyme.com/intr/rb-2370.htm#Table728">(see #00728)</a>.
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CX = type of client (0000h application, 0001h file system).
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AX = operation
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0001h perform standard compression
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0002h perform standard decompression
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0004h perform update compression
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0008h perform MaxCompress
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0020h perform incremental decompression
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0040h perform MRCI 2.0 standard compression
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0080h perform MRCI 2.0 standard decompression.
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AX = FFFFh clear flags
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BX = bitmask of flags to clear (set bits in BX are flags to clear)<br>
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<p><b>Return:</b><br>AX = status
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0000h successful
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0001h invalid function
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0002h server busy, try again
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0003h destination buffer too small
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0004h incompressible data
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0005h bad compressed data format
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BP destroyed (MS-DOS 6.2)
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</PRE>
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<p><b>Note:</b>
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MRCI driver may chain to a previous driver
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<PRE>
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<p>
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Format of MRCREQUEST structure:
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<a name=table728></a>
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Offset Size Description (Table 00728)
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00h DWORD pointer to source buffer
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04h WORD size of source buffer (0000h = 64K)
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06h WORD (UpdateCompress only)
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(call) offset in source buffer of beginning of changed data
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(ret) offset in destination buffer of beginning of changed
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compressed data
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08h DWORD pointer to destination buffer
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must contain original compressed data for UpdateCompress
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0Ch WORD size of destination buffer (0000h = 64K)
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<p><b>any compression:</b><br>Size of buffer for compressed data
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<p><b>standard decompression:</b><br>Number of bytes to be decompressed
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<p><b>incremental decompression:</b><br>Number of byte to decompress now
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(ret) actual size of resulting data
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0Eh WORD client compressed data storage allocation size
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10h DWORD incremental decompression state data
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set to 00000000h before first incremental decompression call
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</PRE>
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<p><b>Notes:</b>
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The source and destination buffers may not overlap.
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The source and destination buffer sizes should normally be the same.
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Application should not update the contents of the MRCREQUEST structure
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between incremental decompression calls
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<p>
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<b>Category: <a href="cat-008.htm" tppabs="http://www.ctyme.com/intr/cat-008.htm">
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Disk I/O Enhancements</a>
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Int 1Ah</a>
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M</a>
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