/*
 * _codecs_jp.c: Codecs collection for Japanese encodings
 *
 * Written by Hye-Shik Chang <perky@FreeBSD.org>
 * $CJKCodecs: _codecs_jp.c,v 1.14 2004/07/07 17:54:47 perky Exp $
 */

#define USING_BINARY_PAIR_SEARCH
#define EMPBASE 0x20000

#include "cjkcodecs.h"
#include "mappings_jp.h"
#include "mappings_jisx0213_pair.h"
#include "alg_jisx0201.h"
#include "emu_jisx0213_2000.h"

/*
 * CP932 codec
 */

ENCODER(cp932)
{
	while (inleft > 0) {
		Py_UNICODE c = IN1;
		DBCHAR code;
		unsigned char c1, c2;

		if (c <= 0x80) {
			WRITE1((unsigned char)c)
			NEXT(1, 1)
			continue;
		}
		else if (c >= 0xff61 && c <= 0xff9f) {
			WRITE1(c - 0xfec0)
			NEXT(1, 1)
			continue;
		}
		else if (c >= 0xf8f0 && c <= 0xf8f3) {
			/* Windows compatibility */
			REQUIRE_OUTBUF(1)
			if (c == 0xf8f0)
				OUT1(0xa0)
			else
				OUT1(c - 0xfef1 + 0xfd)
			NEXT(1, 1)
			continue;
		}

		UCS4INVALID(c)
		REQUIRE_OUTBUF(2)

		TRYMAP_ENC(cp932ext, code, c) {
			OUT1(code >> 8)
			OUT2(code & 0xff)
		}
		else TRYMAP_ENC(jisxcommon, code, c) {
			if (code & 0x8000) /* MSB set: JIS X 0212 */
				return 1;

			/* JIS X 0208 */
			c1 = code >> 8;
			c2 = code & 0xff;
			c2 = (((c1 - 0x21) & 1) ? 0x5e : 0) + (c2 - 0x21);
			c1 = (c1 - 0x21) >> 1;
			OUT1(c1 < 0x1f ? c1 + 0x81 : c1 + 0xc1)
			OUT2(c2 < 0x3f ? c2 + 0x40 : c2 + 0x41)
		}
		else if (c >= 0xe000 && c < 0xe758) {
			/* User-defined area */
			c1 = (Py_UNICODE)(c - 0xe000) / 188;
			c2 = (Py_UNICODE)(c - 0xe000) % 188;
			OUT1(c1 + 0xf0)
			OUT2(c2 < 0x3f ? c2 + 0x40 : c2 + 0x41)
		}
		else
			return 1;

		NEXT(1, 2)
	}

	return 0;
}

DECODER(cp932)
{
	while (inleft > 0) {
		unsigned char c = IN1, c2;

		REQUIRE_OUTBUF(1)
		if (c <= 0x80) {
			OUT1(c)
			NEXT(1, 1)
			continue;
		}
		else if (c >= 0xa0 && c <= 0xdf) {
			if (c == 0xa0)
				OUT1(0xf8f0) /* half-width katakana */
			else
				OUT1(0xfec0 + c)
			NEXT(1, 1)
			continue;
		}
		else if (c >= 0xfd/* && c <= 0xff*/) {
			/* Windows compatibility */
			OUT1(0xf8f1 - 0xfd + c)
			NEXT(1, 1)
			continue;
		}

		REQUIRE_INBUF(2)
		c2 = IN2;

		TRYMAP_DEC(cp932ext, **outbuf, c, c2);
		else if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xea)){
			if (c2 < 0x40 || (c2 > 0x7e && c2 < 0x80) || c2 > 0xfc)
				return 2;

			c = (c < 0xe0 ? c - 0x81 : c - 0xc1);
			c2 = (c2 < 0x80 ? c2 - 0x40 : c2 - 0x41);
			c = (2 * c + (c2 < 0x5e ? 0 : 1) + 0x21);
			c2 = (c2 < 0x5e ? c2 : c2 - 0x5e) + 0x21;

			TRYMAP_DEC(jisx0208, **outbuf, c, c2);
			else return 2;
		}
		else if (c >= 0xf0 && c <= 0xf9) {
			if ((c2 >= 0x40 && c2 <= 0x7e) ||
			    (c2 >= 0x80 && c2 <= 0xfc))
				OUT1(0xe000 + 188 * (c - 0xf0) +
				     (c2 < 0x80 ? c2 - 0x40 : c2 - 0x41))
			else
				return 2;
		}
		else
			return 2;

		NEXT(2, 1)
	}

	return 0;
}


/*
 * EUC-JIS-2004 codec
 */

ENCODER(euc_jis_2004)
{
	while (inleft > 0) {
		ucs4_t c = IN1;
		DBCHAR code;
		int insize;

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

		DECODE_SURROGATE(c)
		insize = GET_INSIZE(c);

		if (c <= 0xFFFF) {
			EMULATE_JISX0213_2000_ENCODE_BMP(code, c)
			else TRYMAP_ENC(jisx0213_bmp, code, c) {
				if (code == MULTIC) {
					if (inleft < 2) {
						if (flags & MBENC_FLUSH) {
							code = find_pairencmap(
							    (ucs2_t)c, 0,
							  jisx0213_pair_encmap,
							    JISX0213_ENCPAIRS);
							if (code == DBCINV)
								return 1;
						}
						else
							return MBERR_TOOFEW;
					}
					else {
						code = find_pairencmap(
							(ucs2_t)c, (*inbuf)[1],
							jisx0213_pair_encmap,
							JISX0213_ENCPAIRS);
						if (code == DBCINV) {
							code = find_pairencmap(
							    (ucs2_t)c, 0,
							  jisx0213_pair_encmap,
							    JISX0213_ENCPAIRS);
							if (code == DBCINV)
								return 1;
						} else
							insize = 2;
					}
				}
			}
			else 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;
			}
			else if (c == 0xff3c)
				/* F/W REVERSE SOLIDUS (see NOTES) */
				code = 0x2140;
			else if (c == 0xff5e)
				/* F/W TILDE (see NOTES) */
				code = 0x2232;
			else
				return 1;
		}
		else if (c >> 16 == EMPBASE >> 16) {
			EMULATE_JISX0213_2000_ENCODE_EMP(code, c)
			else TRYMAP_ENC(jisx0213_emp, code, c & 0xffff);
			else return insize;
		}
		else
			return insize;

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

	return 0;
}

DECODER(euc_jis_2004)
{
	while (inleft > 0) {
		unsigned char c = IN1;
		ucs4_t code;

		REQUIRE_OUTBUF(1)

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

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

			REQUIRE_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;

			REQUIRE_INBUF(3)
			c2 = IN2 ^ 0x80;
			c3 = IN3 ^ 0x80;

			/* JIS X 0213 Plane 2 or JIS X 0212 (see NOTES) */
			EMULATE_JISX0213_2000_DECODE_PLANE2(**outbuf, c2, c3)
			else TRYMAP_DEC(jisx0213_2_bmp, **outbuf, c2, c3) ;
			else TRYMAP_DEC(jisx0213_2_emp, code, c2, c3) {
				WRITEUCS4(EMPBASE | code)
				NEXT_IN(3)
				continue;
			}
			else TRYMAP_DEC(jisx0212, **outbuf, c2, c3) ;
			else return 3;
			NEXT(3, 1)
		}
		else {
			unsigned char c2;

			REQUIRE_INBUF(2)
			c ^= 0x80;
			c2 = IN2 ^ 0x80;

			/* JIS X 0213 Plane 1 */
			EMULATE_JISX0213_2000_DECODE_PLANE1(**outbuf, c, c2)
			else if (c == 0x21 && c2 == 0x40) **outbuf = 0xff3c;
			else if (c == 0x22 && c2 == 0x32) **outbuf = 0xff5e;
			else TRYMAP_DEC(jisx0208, **outbuf, c, c2);
			else TRYMAP_DEC(jisx0213_1_bmp, **outbuf, c, c2);
			else TRYMAP_DEC(jisx0213_1_emp, code, c, c2) {
				WRITEUCS4(EMPBASE | code)
				NEXT_IN(2)
				continue;
			}
			else TRYMAP_DEC(jisx0213_pair, code, c, c2) {
				WRITE2(code >> 16, code & 0xffff)
				NEXT(2, 2)
				continue;
			}
			else return 2;
			NEXT(2, 1)
		}
	}

	return 0;
}


/*
 * EUC-JP codec
 */

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

		if (c < 0x80) {
			WRITE1((unsigned char)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;

		REQUIRE_OUTBUF(1)

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

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

			REQUIRE_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;

			REQUIRE_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;

			REQUIRE_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;
}


/*
 * SHIFT_JIS codec
 */

ENCODER(shift_jis)
{
	while (inleft > 0) {
		Py_UNICODE c = IN1;
		DBCHAR code;
		unsigned char c1, c2;

#ifdef STRICT_BUILD
		JISX0201_R_ENCODE(c, code)
#else
		if (c < 0x80) code = c;
		else if (c == 0x00a5) code = 0x5c; /* YEN SIGN */
		else if (c == 0x203e) code = 0x7e; /* OVERLINE */
#endif
		else JISX0201_K_ENCODE(c, code)
		else UCS4INVALID(c)
		else code = NOCHAR;

		if (code < 0x80 || (code >= 0xa1 && code <= 0xdf)) {
			REQUIRE_OUTBUF(1)

			OUT1((unsigned char)code)
			NEXT(1, 1)
			continue;
		}

		REQUIRE_OUTBUF(2)

		if (code == NOCHAR) {
			TRYMAP_ENC(jisxcommon, code, c);
#ifndef STRICT_BUILD
			else if (c == 0xff3c)
				code = 0x2140; /* FULL-WIDTH REVERSE SOLIDUS */
#endif
			else
				return 1;

			if (code & 0x8000) /* MSB set: JIS X 0212 */
				return 1;
		}

		c1 = code >> 8;
		c2 = code & 0xff;
		c2 = (((c1 - 0x21) & 1) ? 0x5e : 0) + (c2 - 0x21);
		c1 = (c1 - 0x21) >> 1;
		OUT1(c1 < 0x1f ? c1 + 0x81 : c1 + 0xc1)
		OUT2(c2 < 0x3f ? c2 + 0x40 : c2 + 0x41)
		NEXT(1, 2)
	}

	return 0;
}

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

		REQUIRE_OUTBUF(1)

#ifdef STRICT_BUILD
		JISX0201_R_DECODE(c, **outbuf)
#else
		if (c < 0x80) **outbuf = c;
#endif
		else JISX0201_K_DECODE(c, **outbuf)
		else if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xea)){
			unsigned char c1, c2;

			REQUIRE_INBUF(2)
			c2 = IN2;
			if (c2 < 0x40 || (c2 > 0x7e && c2 < 0x80) || c2 > 0xfc)
				return 2;

			c1 = (c < 0xe0 ? c - 0x81 : c - 0xc1);
			c2 = (c2 < 0x80 ? c2 - 0x40 : c2 - 0x41);
			c1 = (2 * c1 + (c2 < 0x5e ? 0 : 1) + 0x21);
			c2 = (c2 < 0x5e ? c2 : c2 - 0x5e) + 0x21;

#ifndef STRICT_BUILD
			if (c1 == 0x21 && c2 == 0x40) {
				/* FULL-WIDTH REVERSE SOLIDUS */
				OUT1(0xff3c)
				NEXT(2, 1)
				continue;
			}
#endif
			TRYMAP_DEC(jisx0208, **outbuf, c1, c2) {
				NEXT(2, 1)
				continue;
			}
			else
				return 2;
		}
		else
			return 2;

		NEXT(1, 1) /* JIS X 0201 */
	}

	return 0;
}


/*
 * SHIFT_JIS-2004 codec
 */

ENCODER(shift_jis_2004)
{
	while (inleft > 0) {
		ucs4_t c = IN1;
		DBCHAR code = NOCHAR;
		int c1, c2;
		size_t insize;

		JISX0201_ENCODE(c, code)
		else DECODE_SURROGATE(c)

		if (code < 0x80 || (code >= 0xa1 && code <= 0xdf)) {
			WRITE1((unsigned char)code)
			NEXT(1, 1)
			continue;
		}

		REQUIRE_OUTBUF(2)
		insize = GET_INSIZE(c);

		if (code == NOCHAR) {
			if (c <= 0xffff) {
				EMULATE_JISX0213_2000_ENCODE_BMP(code, c)
				else TRYMAP_ENC(jisx0213_bmp, code, c) {
					if (code == MULTIC) {
						if (inleft < 2) {
						    if (flags & MBENC_FLUSH) {
							code = find_pairencmap
							    ((ucs2_t)c, 0,
							  jisx0213_pair_encmap,
							    JISX0213_ENCPAIRS);
							if (code == DBCINV)
							    return 1;
						    }
						    else
							    return MBERR_TOOFEW;
						}
						else {
						    code = find_pairencmap(
							    (ucs2_t)c, IN2,
							  jisx0213_pair_encmap,
							    JISX0213_ENCPAIRS);
						    if (code == DBCINV) {
							code = find_pairencmap(
							    (ucs2_t)c, 0,
							  jisx0213_pair_encmap,
							    JISX0213_ENCPAIRS);
							if (code == DBCINV)
							    return 1;
							}
							else
							    insize = 2;
						}
					}
				}
				else TRYMAP_ENC(jisxcommon, code, c) {
					/* abandon JIS X 0212 codes */
					if (code & 0x8000)
						return 1;
				}
				else return 1;
			}
			else if (c >> 16 == EMPBASE >> 16) {
				EMULATE_JISX0213_2000_ENCODE_EMP(code, c)
				else TRYMAP_ENC(jisx0213_emp, code, c&0xffff);
				else return insize;
			}
			else
				return insize;
		}

		c1 = code >> 8;
		c2 = (code & 0xff) - 0x21;

		if (c1 & 0x80) { /* Plane 2 */
			if (c1 >= 0xee) c1 -= 0x87;
			else if (c1 >= 0xac || c1 == 0xa8) c1 -= 0x49;
			else c1 -= 0x43;
		}
		else /* Plane 1 */
			c1 -= 0x21;

		if (c1 & 1) c2 += 0x5e;
		c1 >>= 1;
		OUT1(c1 + (c1 < 0x1f ? 0x81 : 0xc1))
		OUT2(c2 + (c2 < 0x3f ? 0x40 : 0x41))

		NEXT(insize, 2)
	}

	return 0;
}

DECODER(shift_jis_2004)
{
	while (inleft > 0) {
		unsigned char c = IN1;

		REQUIRE_OUTBUF(1)
		JISX0201_DECODE(c, **outbuf)
		else if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xfc)){
			unsigned char c1, c2;
			ucs4_t code;

			REQUIRE_INBUF(2)
			c2 = IN2;
			if (c2 < 0x40 || (c2 > 0x7e && c2 < 0x80) || c2 > 0xfc)
				return 2;

			c1 = (c < 0xe0 ? c - 0x81 : c - 0xc1);
			c2 = (c2 < 0x80 ? c2 - 0x40 : c2 - 0x41);
			c1 = (2 * c1 + (c2 < 0x5e ? 0 : 1));
			c2 = (c2 < 0x5e ? c2 : c2 - 0x5e) + 0x21;

			if (c1 < 0x5e) { /* Plane 1 */
				c1 += 0x21;
				EMULATE_JISX0213_2000_DECODE_PLANE1(**outbuf,
						c1, c2)
				else TRYMAP_DEC(jisx0208, **outbuf, c1, c2) {
					NEXT_OUT(1)
				}
				else TRYMAP_DEC(jisx0213_1_bmp, **outbuf,
						c1, c2) {
					NEXT_OUT(1)
				}
				else TRYMAP_DEC(jisx0213_1_emp, code, c1, c2) {
					WRITEUCS4(EMPBASE | code)
				}
				else TRYMAP_DEC(jisx0213_pair, code, c1, c2) {
					WRITE2(code >> 16, code & 0xffff)
					NEXT_OUT(2)
				}
				else
					return 2;
				NEXT_IN(2)
			}
			else { /* Plane 2 */
				if (c1 >= 0x67) c1 += 0x07;
				else if (c1 >= 0x63 || c1 == 0x5f) c1 -= 0x37;
				else c1 -= 0x3d;

				EMULATE_JISX0213_2000_DECODE_PLANE2(**outbuf,
						c1, c2)
				else TRYMAP_DEC(jisx0213_2_bmp, **outbuf,
						c1, c2) ;
				else TRYMAP_DEC(jisx0213_2_emp, code, c1, c2) {
					WRITEUCS4(EMPBASE | code)
					NEXT_IN(2)
					continue;
				}
				else
					return 2;
				NEXT(2, 1)
			}
			continue;
		}
		else
			return 2;

		NEXT(1, 1) /* JIS X 0201 */
	}

	return 0;
}


BEGIN_MAPPINGS_LIST
  MAPPING_DECONLY(jisx0208)
  MAPPING_DECONLY(jisx0212)
  MAPPING_ENCONLY(jisxcommon)
  MAPPING_DECONLY(jisx0213_1_bmp)
  MAPPING_DECONLY(jisx0213_2_bmp)
  MAPPING_ENCONLY(jisx0213_bmp)
  MAPPING_DECONLY(jisx0213_1_emp)
  MAPPING_DECONLY(jisx0213_2_emp)
  MAPPING_ENCONLY(jisx0213_emp)
  MAPPING_ENCDEC(jisx0213_pair)
  MAPPING_ENCDEC(cp932ext)
END_MAPPINGS_LIST

BEGIN_CODECS_LIST
  CODEC_STATELESS(shift_jis)
  CODEC_STATELESS(cp932)
  CODEC_STATELESS(euc_jp)
  CODEC_STATELESS(shift_jis_2004)
  CODEC_STATELESS(euc_jis_2004)
  { "euc_jisx0213", (void *)2000, NULL, _STATELESS_METHODS(euc_jis_2004) },
  { "shift_jisx0213", (void *)2000, NULL, _STATELESS_METHODS(shift_jis_2004) },
END_CODECS_LIST

I_AM_A_MODULE_FOR(jp)