122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/*
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* _shift_jis.c: the SHIFT-JIS codec
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*
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* Written by Hye-Shik Chang <perky@FreeBSD.org>
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* $CJKCodecs: _shift_jis.c,v 1.4 2003/12/31 05:46:55 perky Exp $
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*/
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#include "codeccommon.h"
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#include "alg_jisx0201.h"
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ENCMAP(jisxcommon)
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DECMAP(jisx0208)
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ENCODER(shift_jis)
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{
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while (inleft > 0) {
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Py_UNICODE c = IN1;
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DBCHAR code;
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unsigned char c1, c2;
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#ifdef STRICT_BUILD
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JISX0201_R_ENCODE(c, code)
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#else
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if (c < 0x80) code = c;
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else if (c == 0x00a5) code = 0x5c; /* YEN SIGN */
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else if (c == 0x203e) code = 0x7e; /* OVERLINE */
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#endif
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else JISX0201_K_ENCODE(c, code)
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else UCS4INVALID(c)
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else code = NOCHAR;
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if (code < 0x80 || (code >= 0xa1 && code <= 0xdf)) {
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RESERVE_OUTBUF(1)
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OUT1((unsigned char)code)
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NEXT(1, 1)
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continue;
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}
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RESERVE_OUTBUF(2)
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if (code == NOCHAR) {
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TRYMAP_ENC(jisxcommon, code, c);
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#ifndef STRICT_BUILD
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else if (c == 0xff3c)
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code = 0x2140; /* FULL-WIDTH REVERSE SOLIDUS */
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#endif
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else
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return 1;
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if (code & 0x8000) /* MSB set: JIS X 0212 */
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return 1;
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}
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c1 = code >> 8;
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c2 = code & 0xff;
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c2 = (((c1 - 0x21) & 1) ? 0x5e : 0) + (c2 - 0x21);
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c1 = (c1 - 0x21) >> 1;
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OUT1(c1 < 0x1f ? c1 + 0x81 : c1 + 0xc1)
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OUT2(c2 < 0x3f ? c2 + 0x40 : c2 + 0x41)
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NEXT(1, 2)
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}
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return 0;
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}
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DECODER(shift_jis)
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{
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while (inleft > 0) {
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unsigned char c = IN1;
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RESERVE_OUTBUF(1)
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#ifdef STRICT_BUILD
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JISX0201_R_DECODE(c, **outbuf)
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#else
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if (c < 0x80) **outbuf = c;
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#endif
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else JISX0201_K_DECODE(c, **outbuf)
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else if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xea)) {
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unsigned char c1, c2;
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RESERVE_INBUF(2)
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c2 = IN2;
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if (c2 < 0x40 || (c2 > 0x7e && c2 < 0x80) || c2 > 0xfc)
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return 2;
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c1 = (c < 0xe0 ? c - 0x81 : c - 0xc1);
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c2 = (c2 < 0x80 ? c2 - 0x40 : c2 - 0x41);
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c1 = (2 * c1 + (c2 < 0x5e ? 0 : 1) + 0x21);
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c2 = (c2 < 0x5e ? c2 : c2 - 0x5e) + 0x21;
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#ifndef STRICT_BUILD
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if (c1 == 0x21 && c2 == 0x40) {
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/* FULL-WIDTH REVERSE SOLIDUS */
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OUT1(0xff3c)
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NEXT(2, 1)
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continue;
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}
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#endif
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TRYMAP_DEC(jisx0208, **outbuf, c1, c2) {
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NEXT(2, 1)
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continue;
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} else
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return 2;
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} else
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return 2;
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NEXT(1, 1) /* JIS X 0201 */
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}
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return 0;
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}
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#include "codecentry.h"
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BEGIN_CODEC_REGISTRY(shift_jis)
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MAPOPEN(ja_JP)
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IMPORTMAP_DEC(jisx0208)
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IMPORTMAP_ENC(jisxcommon)
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MAPCLOSE()
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END_CODEC_REGISTRY(shift_jis)
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