Размер файла на диске Assembler. DOS

--------D-214E-------------------------------
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