cpython/Modules/cjkcodecs/_codecs_tw.c

/*
 * _codecs_tw.c: Codecs collection for Taiwan's encodings
 *
 * Written by Hye-Shik Chang <perky@FreeBSD.org>
 */

#include "cjkcodecs.h"
#include "mappings_tw.h"

/*
 * BIG5 codec
 */

ENCODER(big5)
{
    while (inleft > 0) {
        Py_UNICODE c = **inbuf;
        DBCHAR code;

        if (c < 0x80) {
            REQUIRE_OUTBUF(1)
            **outbuf = (unsigned char)c;
            NEXT(1, 1)
            continue;
        }
        UCS4INVALID(c)

        REQUIRE_OUTBUF(2)

        TRYMAP_ENC(big5, code, c);
        else return 1;

        OUT1(code >> 8)
        OUT2(code & 0xFF)
        NEXT(1, 2)
    }

    return 0;
}

DECODER(big5)
{
    while (inleft > 0) {
        unsigned char c = IN1;

        REQUIRE_OUTBUF(1)

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

        REQUIRE_INBUF(2)
        TRYMAP_DEC(big5, **outbuf, c, IN2) {
            NEXT(2, 1)
        }
        else return 2;
    }

    return 0;
}


/*
 * CP950 codec
 */

ENCODER(cp950)
{
    while (inleft > 0) {
        Py_UNICODE c = IN1;
        DBCHAR code;

        if (c < 0x80) {
            WRITE1((unsigned char)c)
            NEXT(1, 1)
            continue;
        }
        UCS4INVALID(c)

        REQUIRE_OUTBUF(2)
        TRYMAP_ENC(cp950ext, code, c);
        else TRYMAP_ENC(big5, code, c);
        else return 1;

        OUT1(code >> 8)
        OUT2(code & 0xFF)
        NEXT(1, 2)
    }

    return 0;
}

DECODER(cp950)
{
    while (inleft > 0) {
        unsigned char c = IN1;

        REQUIRE_OUTBUF(1)

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

        REQUIRE_INBUF(2)

        TRYMAP_DEC(cp950ext, **outbuf, c, IN2);
        else TRYMAP_DEC(big5, **outbuf, c, IN2);
        else return 2;

        NEXT(2, 1)
    }

    return 0;
}



BEGIN_MAPPINGS_LIST
  MAPPING_ENCDEC(big5)
  MAPPING_ENCDEC(cp950ext)
END_MAPPINGS_LIST

BEGIN_CODECS_LIST
  CODEC_STATELESS(big5)
  CODEC_STATELESS(cp950)
END_CODECS_LIST

I_AM_A_MODULE_FOR(tw)