Размер файла на диске Assembler. DOS

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INT 21 - DOS 2+ - "FINDFIRST" - FIND FIRST MATCHING FILE
	AH = 4Eh
	AL = special flag for use by APPEND (refer to note below)
	CX = file attribute mask (see #01420 at AX=4301h) (bits 0 and 5 ignored)
	    0088h (Novell DOS 7) find first deleted file
	DS:DX -> ASCIZ file specification (may include path and wildcards)
Return: CF clear if successful
	    Disk Transfer Area filled with FindFirst data block (see #01626)
	CF set on error
	    AX = error code (02h,03h,12h) (see #01680 at AH=59h/BX=0000h)
Notes:	for search attributes other than 08h, all files with at MOST the
	  specified combination of hidden, system, and directory attributes
	  will be returned.  Under DOS 2.x, searching for attribute 08h
	  (volume label) will also return normal files, while under DOS 3.0+
	  only the volume label (if any) will be returned.
	this call also returns successfully if given the name of a character
	  device without wildcards.  DOS 2.x returns attribute 00h, size 0,
	  and the current date and time.  DOS 3.0+ returns attribute 40h and
	  the current date and time.
	immediately after an INT 2F/AX=B711h (APPEND return found name), the
	  name at DS:DX will be overwritten; if AL=00h on entry, the actual
	  found pathname will be stored, otherwise, the actual found path
	  will be prepended to the original filespec without a path.
	under LANtastic, this call may be used to obtain a list of a server's
	  shared resources by searching for "\\SERVER\*.*"; a list of printer
	  resources may be obtained by searching for "\\SERVER\@*.*"
	under the FlashTek X-32 DOS extender, the filespec pointer is in DS:EDX
BUGS:	under DOS 3.x and 4.x, the second and subsequent calls to this function
	  with a character device name (no wildcards) and search attributes
	  which include the volume-label bit (08h) will fail unless there is
	  an intervening DOS call which implicitly or explicity performs a
	  directory search without the volume-label bit.  Such implicit
	  searches are performed by CREATE (AH=3Ch), OPEN (AH=3Dh), UNLINK
	  (AH=41h), and RENAME (AH=56h)
	DR DOS 3.41 and 5.0 return the Directory attribute for the volume label
SeeAlso: AH=11h,AH=4Fh,AX=4301h,AX=714Eh,AX=71A1h,AX=F257h/SF=02h
SeeAlso: INT 2F/AX=111Bh,INT 2F/AX=B711h
 
Format of FindFirst data block:
Offset	Size	Description	(Table 01626)
---PC-DOS 3.10, PC-DOS 4.01, MS-DOS 3.2/3.3/5.0---
 00h	BYTE	drive letter (bits 0-6), remote if bit 7 set
 01h 11 BYTEs	search template
 0Ch	BYTE	search attributes
---DOS 2.x (and some DOS 3.x???)---
 00h	BYTE	search attributes
 01h	BYTE	drive letter
 02h 11 BYTEs	search template
---WILDUNIX.COM---
 00h 12 BYTEs	15-character wildcard search pattern and drive letter (packed)
 0Ch	BYTE	search attributes
---DOS 2.x and most 3.x---
 0Dh	WORD	entry count within directory
 0Fh	DWORD	pointer to DTA???
 13h	WORD	cluster number of start of parent directory
---PC-DOS 4.01, MS-DOS 3.2/3.3/5.0---
 0Dh	WORD	entry count within directory
 0Fh	WORD	cluster number of start of parent directory
 11h  4 BYTEs	reserved
---OS/2 MVDM---
 00h	WORD	"OS2_BMP_handle"
 02h	WORD	"OS2_LastEnt"
 04h	DWORD	"OS2_Checksum"
 08h	BYTE	"OS2_usi_flag"
 09h	DWORD	used by DOS emulator for second pass for volume-label searches
 0Dh	WORD	(ret) "DOS_LastEnt" entry count within directory
 0Fh	BYTE	OS/2 Processed-FindFirst flag
		00h FindFirst processed by DOS
		42h FindFirst processed by OS/2
 10h  5 BYTEs	reserved for future use
---all versions, documented fields---
 15h	BYTE	attribute of file found
 16h	WORD	file time (see #01665 at AX=5700h)
 18h	WORD	file date (see #01666 at AX=5700h)
 1Ah	DWORD	file size
 1Eh 13 BYTEs	ASCIZ filename+extension