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(*

    Copyright 2021 Anton Krotov

    This file is part of CEdit.

    CEdit is free software: you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation, either version 3 of the License, or

    (at your option) any later version.

    CEdit is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with CEdit. If not, see .

*)

MODULE Clipboard;

IMPORT SYSTEM, K := KOSAPI, E := Encodings, Lines;

CONST

    TTEXT = 0;

    lenEOL* = 2;

TYPE

    tBuffer* = POINTER TO RECORD

        dataPtr*: INTEGER;

        pos: INTEGER

    END;

PROCEDURE free (ptr: INTEGER);

BEGIN

    ptr := K.free(ptr)

END free;

PROCEDURE bufSize* (buffer: tBuffer): INTEGER;

    RETURN buffer.pos - buffer.dataPtr

END bufSize;

PROCEDURE put* (buffer: tBuffer);

VAR

    a, cnt, size: INTEGER;

    ptr, pchar: INTEGER;

    wch: WCHAR;

BEGIN

    cnt := bufSize(buffer) DIV 2;

    size := cnt + 12;

    a := K.malloc(size);

    ASSERT(a # 0);

    SYSTEM.PUT32(a, size);

    SYSTEM.PUT32(a + 4, TTEXT);

    SYSTEM.PUT32(a + 8, 1);

    pchar := a + 12;

    ptr := buffer.dataPtr;

    WHILE cnt > 0 DO

        SYSTEM.GET(ptr, wch);

        SYSTEM.PUT(pchar, CHR(E.UNI[ORD(wch), E.CP866] MOD 256));

        INC(pchar);

        INC(ptr, 2);

        DEC(cnt)

    END;

    K.sysfunc2(54, 3);

    K.sysfunc4(54, 2, size, a)

END put;

PROCEDURE create* (bufSize: INTEGER): tBuffer;

VAR

    res: tBuffer;

BEGIN

    NEW(res);

    res.dataPtr := K.malloc(bufSize*SYSTEM.SIZE(WCHAR) + 4096);

    ASSERT(res.dataPtr # 0);

    res.pos := res.dataPtr

    RETURN res

END create;

PROCEDURE destroy* (VAR buffer: tBuffer);

BEGIN

    IF buffer # NIL THEN

        IF buffer.dataPtr # 0 THEN

            free(buffer.dataPtr)

        END;

        DISPOSE(buffer)

    END

END destroy;

PROCEDURE append* (buffer: tBuffer; line: Lines.tLine; first, last: INTEGER);

VAR

    strSize: INTEGER;

BEGIN

    strSize := (last - first + 1)*SYSTEM.SIZE(WCHAR);

    IF strSize > 0 THEN

        SYSTEM.MOVE(Lines.getPChar(line, first), buffer.pos, strSize);

        INC(buffer.pos, strSize)

    END

END append;

PROCEDURE appends* (buffer: tBuffer; s: ARRAY OF WCHAR; first, last: INTEGER);

VAR

    strSize: INTEGER;

BEGIN

    strSize := (last - first + 1)*SYSTEM.SIZE(WCHAR);

    IF strSize > 0 THEN

        SYSTEM.MOVE(SYSTEM.ADR(s[first]), buffer.pos, strSize);

        INC(buffer.pos, strSize)

    END

END appends;

PROCEDURE eol* (buffer: tBuffer);

BEGIN

    appends(buffer, 0DX + 0AX, 0, 1)

END eol;

PROCEDURE eot* (buffer: tBuffer);

END eot;

PROCEDURE available* (): BOOLEAN;

VAR

    ptr: INTEGER;

    n, size, typ, x: INTEGER;

    res: BOOLEAN;

BEGIN

    res := FALSE;

    n := K.sysfunc2(54, 0);

    IF n > 0 THEN

        ptr := K.sysfunc3(54, 1, n - 1);

        SYSTEM.GET32(ptr, size);

        SYSTEM.GET32(ptr + 4, typ);

        SYSTEM.GET(ptr + 8, x);

        res := (typ = TTEXT) & (x = 1);

        free(ptr)

    END

    RETURN res

END available;

PROCEDURE get* (VAR cnt: INTEGER): INTEGER;

VAR

    ptr: INTEGER;

BEGIN

    ptr := 0;

    cnt := 0;

    IF available() THEN

        ptr := K.sysfunc3(54, 1, K.sysfunc2(54, 0) - 1);

        SYSTEM.GET32(ptr, cnt);

        DEC(cnt, 12);

        INC(ptr, 12)

    END

    RETURN ptr

END get;

END Clipboard.