/*
 * _euc_jp.c: the EUC-JP codec
 *
 * Written by Hye-Shik Chang <perky@FreeBSD.org>
 * $CJKCodecs: _euc_jp.c,v 1.5 2003/12/31 05:46:55 perky Exp $
 */

#include "codeccommon.h"

ENCMAP(jisxcommon)
DECMAP(jisx0208)
DECMAP(jisx0212)

ENCODER(euc_jp)
{
    while (inleft > 0) {
        Py_UNICODE  c = IN1;
        DBCHAR      code;

        if (c < 0x80) {
            WRITE1(c)
            NEXT(1, 1)
            continue;
        }

        UCS4INVALID(c)

        TRYMAP_ENC(jisxcommon, code, c);
        else if (c >= 0xff61 && c <= 0xff9f) {
            /* JIS X 0201 half-width katakana */
            WRITE2(0x8e, c - 0xfec0)
            NEXT(1, 2)
            continue;
        }
#ifndef STRICT_BUILD
        else if (c == 0xff3c) /* FULL-WIDTH REVERSE SOLIDUS */
            code = 0x2140;
        else if (c == 0xa5) { /* YEN SIGN */
            WRITE1(0x5c);
            NEXT(1, 1)
            continue;
        } else if (c == 0x203e) { /* OVERLINE */
            WRITE1(0x7e);
            NEXT(1, 1)
            continue;
        }
#endif
        else
            return 1;

        if (code & 0x8000) {
            /* JIS X 0212 */
            WRITE3(0x8f, code >> 8, (code & 0xFF) | 0x80)
            NEXT(1, 3)
        } else {
            /* JIS X 0208 */
            WRITE2((code >> 8) | 0x80, (code & 0xFF) | 0x80)
            NEXT(1, 2)
        }
    }

    return 0;
}

DECODER(euc_jp)
{
    while (inleft > 0) {
        unsigned char    c = IN1;

        RESERVE_OUTBUF(1)

        if (c < 0x80) {
            OUT1(c)
            NEXT(1, 1)
            continue;
        }

        if (c == 0x8e) {
            /* JIS X 0201 half-width katakana */
            unsigned char    c2;

            RESERVE_INBUF(2)
            c2 = IN2;
            if (c2 >= 0xa1 && c2 <= 0xdf) {
                OUT1(0xfec0 + c2)
                NEXT(2, 1)
            } else
                return 2;
        } else if (c == 0x8f) {
            unsigned char    c2, c3;

            RESERVE_INBUF(3)
            c2 = IN2;
            c3 = IN3;
            /* JIS X 0212 */
            TRYMAP_DEC(jisx0212, **outbuf, c2 ^ 0x80, c3 ^ 0x80) {
                NEXT(3, 1)
            } else
                return 3;
        } else {
            unsigned char    c2;

            RESERVE_INBUF(2)
            c2 = IN2;
            /* JIS X 0208 */
#ifndef STRICT_BUILD
            if (c == 0xa1 && c2 == 0xc0) /* FULL-WIDTH REVERSE SOLIDUS */
                **outbuf = 0xff3c;
            else
#endif
            TRYMAP_DEC(jisx0208, **outbuf, c ^ 0x80, c2 ^ 0x80) ;
            else return 2;
            NEXT(2, 1)
        }
    }

    return 0;
}

#include "codecentry.h"
BEGIN_CODEC_REGISTRY(euc_jp)
    MAPOPEN(ja_JP)
        IMPORTMAP_DEC(jisx0208)
        IMPORTMAP_DEC(jisx0212)
        IMPORTMAP_ENC(jisxcommon)
    MAPCLOSE()
END_CODEC_REGISTRY(euc_jp)