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boxdraw.htm
Header
Table
Main

Project Box Draw is the source text of compiled 32bit Windows executable utility which converts codes of Box Drawing characters from OEM encoding to HTML Unicode entities.

I employ this utility to convert schematic images and diagrams created with simple semigraphic capability of plaintext editor (MultiEdit) for publishing on web.

Format

PE console application

Platform

Windows

Input

Text file with semigraphic box-drawing characters in 8bit OEM encoding.

Output

Text file where each character from the range 0xB0..0xDF is replaced with the corresponding HTML entity.
For instance BOX DRAWINGS VERTICAL DOUBLE AND RIGHT SINGLE encoded as character 0xC7 is replaced with 8 characters ╟ which is displayed in browser as ╟.

Build

euroasm boxdraw.htm

Run

boxdraw input.txt output.html

Header

Definition of program properties and data variables.

        EUROASM UNICODE=OFF,
boxdraw PROGRAM FORMAT=PE,WIDTH=32,ENTRY=Start:
        INCLUDEHEAD1 wins.htm, winscon.htm, winapi.htm, winf32.htm, string32.htm, cpuext32.htm
[.data]
InpFile DS FILE ; Declare FILE structures for input & output:
OutFile DS FILE
HelpText:      ; Message issued when run with incorrect number of parameters.
 DB 'Program:  boxdraw.exe InputFileName OutputFileName',13,10
 DB 'Format:   32bit Windows console application',13,10
 DB 'Version:  %^DATE',13,10
 DB 'Licence:  Public domain by vitsoft',13,10
 DB 'Function: Conversion of box drawing characters from OEM encoding',13,10
 DB '           to HTML Unicode entities.',13,10
 DB 0
Entity: DB 0x26,'#x????;'  ; Question marks in the template &#x????; will be replaced with 4 hexadecimal characters.

Table

Conversion table of box-drawing characters 0xB0..0xDF from 8bit CP437 to 16bit UNICODE.

       ALIGN WORD
Table: DW \
0x2591, \ 0xB0 ░ LIGHT SHADE
0x2592, \ 0xB1 ▒ MEDIUM SHADE
0x2593, \ 0xB2 ▓ DARK SHADE
0x2502, \ 0xB3 │ BOX DRAWINGS LIGHT VERTICAL
0x2524, \ 0xB4 ┤ BOX DRAWINGS LIGHT VERTICAL AND LEFT
0x2561, \ 0xB5 ╡ BOX DRAWINGS LIGHT VERTICAL SINGLE AND LEFT DOUBLE
0x2562, \ 0xB6 ╢ BOX DRAWINGS VERTICAL DOUBLE AND LEFT SINGLE
0x2556, \ 0xB7 ╖ BOX DRAWINGS DOWN DOUBLE AND LEFT SINGLE
0x2555, \ 0xB8 ╕ BOX DRAWINGS DOWN SINGLE AND LEFT DOUBLE
0x2563, \ 0xB9 ╣ BOx DRAWINGS DOUBLE VERTICAL AND LEFT
0x2551, \ 0xBA ║ BOX DRAWINGS DOUBLE VERTICAL
0x2557, \ 0xBB ╗ BOX DRAWINGS DOUBLE DOWN AND LEFT
0x255D, \ 0xBC ╝ BOX DRAWINGS DOUBLE UP AND LEFT
0x255C, \ 0xBD ╜ BOX DRAWINGS UP DOUBLE AND LEFT SINGLE
0x255B, \ 0xBE ╛ BOX DRAWINGS UP SINGLE AND LEFT DOUBLE
0x2510, \ 0xBF ┐ BOX DRAWINGS LIGHT DOWN AND LEFT
0x2514, \ 0xC0 └ BOX DRAWINGS LIGHT UP AND RIGHT
0x2534, \ 0xC1 ┴ BOX DRAWINGS LIGHT UP AND HORIZONTAL
0x252C, \ 0xC2 ┬ BOX DRAWINGS LIGHT DOWN AND HORIZONTAL
0x251C, \ 0xC3 ├ BOX DRAWINGS LIGHT VERTICAL AND LEFT
0x2500, \ 0xC4 ─ BOX DRAWINGS LIGHT HORIZONTAL
0x253C, \ 0xC5 ┼ BOX DRAWINGS LIGHT VERTICAL AND HORIZONTAL
0x255E, \ 0xC6 ╞ BOX DRAWINGS VERTICAL SINGLE AND RIGHT DOUBLE
0x255F, \ 0xC7 ╟ BOX DRAWINGS VERTICAL DOUBLE AND RIGHT SINGLE
0x255A, \ 0xC8 ╚ BOX DRAWINGS DOUBLE UP AND RIGHT
0x2554, \ 0xC9 ╔ BOX DRAWINGS DOUBLE DOWN AND RIGHT
0x2569, \ 0xCA ╩ BOX DRAWINGS DOUBLE UP AND HORIZONTAL
0x2566, \ 0xCB ╦ BOX DRAWINGS DOUBLE DOWN AND HORIZONTAL
0x2560, \ 0xCC ╠ BOX DRAWINGS DOUBLE VERTICAL AND RIGHT
0x2550, \ 0xCD ═ BOX DRAWINGS DOUBLE HORIZONTAL
0x256C, \ 0xCE ╬ BOX DRAWINGS DOUBLE VERTICAL AND HORIZONTAL
0x2567, \ 0xCF ╧ BOX DRAWINGS UP SINGLE AND HORIZONTAL DOUBLE
0x2568, \ 0xD0 ╨ BOX DRAWINGS UP DOUBLE AND HORIZONTAL SINGLE
0x2564, \ 0xD1 ╤ BOX DRAWINGS DOWN SINGLE AND HORIZONTAL DOUBLE
0x2565, \ 0xD2 ╥ BOX DRAWINGS DOWN DOUBLE AND HORIZONTAL SINGLE
0x2559, \ 0xD3 ╙ BOX DRAWINGS UP DOUBLE AND RIGHT SINGLE
0x2558, \ 0xD4 ╘ BOX DRAWINGS UP SINGLE AND RIGHT DOUBLE
0x2552, \ 0xD5 ╒ BOX DRAWINGS DOWN SINGLE AND RIGHT DOUBLE
0x2553, \ 0xD6 ╓ BOX DRAWINGS DOWN DOUBLE AND RIGHT SINGLE
0x256B, \ 0xD7 ╫ BOX DRAWINGS VERTICAL DOUBLE AND HORIYONTAL SINGLE
0x256A, \ 0xD8 ╪ BOX DRAWINGS VERTICAL SINGLE AND HORIZONTAL DOUBLE
0x2518, \ 0xD9 ┘ BOX DRAWINGS LIGHT UP AND LEFT
0x250C, \ 0xDA ┌ BOX DRAWINGS LIGHT DOWN AND RIGHT
0x2588, \ 0xDB █ FULL BLOCK
0x2584, \ 0xDC ▄ LOWER HALF BLOCK
0x258C, \ 0xDD ▌ LEFT HALF BLOCK
0x2590, \ 0xDE ▐ RIGHT HALF BLOCK
0x2580, \ 0xDF ▀ UPPER HALF BLOCK
;
 %IF SIZE# Table <> 96
   %ERROR "Conversion table size is not 96."
 %ENDIF

Main

Program code.

[.text]
Start:    GetArgCount ; Macro from library winapi.htm.
          JNC OK:  ; If number of command-line arguments returned normally.
Help:     StdOutput HelpText, Handle=STD_ERROR_HANDLE
Abort:    TerminateProgram Errorlevel=8
BadInput: StdOutput =B'Error reading input file ', InpFile.Name, Eol=Yes, Handle=STD_ERROR_HANDLE
          JMP Abort:
BadOutput:StdOutput =B'Error writing output file ', OutFile.Name, Eol=Yes, Handle=STD_ERROR_HANDLE
          JMP Abort:
OK:       CMP ECX,2    ; Two arguments required.
          JNE Help:
          GetArg 2     ; ESI,ECX is now OutputFileName.
          StripQuotes ESI,ECX
          FileAssign OutFile,ESI,Size=ECX
          FileStreamCreate OutFile
          JC BadOutput:
          GetArg 1     ; ESI,ECX is now InputFileName.
          StripQuotes ESI,ECX
          FileAssign InpFile,ESI,Size=ECX
          FileLoad InpFile  ; Read input file to memory, return pointer,size in ESI,EAX.
          JC BadInput:
          LEA EDX,[ESI+EAX] ; Input contents is now between ESI..EDX.
NextChar: CMP ESI,EDX  ; Is the end of input reached?
          JNB End:     ; When all characters were converted.
          XOR EAX,EAX  ; Clear the working register.
          LODSB
          CMP AL,0xB0  ; The  lowest supported OEM box character.
          JB Copy:
          CMP AL,0xDF  ; The highest supported OEM box character.
          JA Copy:
          LEA EBX,[EAX-0xB0] ; EBX is now 0..0x1F for box characters 0xB0..0xDF.
          MOV AX,[Table + 2*EBX] ; The actual conversion.
          StoH Entity+3, Size=4, LeadingZeroes=yes ; Update the variable Entity with 4 hexa chars.
          FileStreamWrite OutFile,Entity,8 ; Store the converted Entity to output.
          JMP NextChar:
Copy:     FileStreamWriteByte OutFile ; Copy ordinary non-box character AL to output.
          JMP NextChar:
End:      FileClose InpFile, OutFile
          TerminateProgram Errorlevel=0
        ENDPROGRAM boxdraw