mirror of https://github.com/python/cpython
174 lines
4.4 KiB
C
174 lines
4.4 KiB
C
/*
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* _iso2022_jp.c: the ISO-2022-JP codec (RFC1468)
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*
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* Written by Hye-Shik Chang <perky@FreeBSD.org>
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* $CJKCodecs: _iso2022_jp.c,v 1.7 2003/12/31 05:46:55 perky Exp $
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*/
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#define ISO2022_DESIGNATIONS \
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CHARSET_ASCII, CHARSET_JISX0201_R, CHARSET_JISX0208, CHARSET_JISX0208_O
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#define ISO2022_NO_SHIFT
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#define ISO2022_USE_JISX0208EXT
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#include "codeccommon.h"
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#include "iso2022common.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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#define HAVE_ENCODER_INIT
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ENCODER_INIT(iso2022_jp)
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{
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STATE_CLEARFLAGS(state)
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STATE_SETG0(state, CHARSET_ASCII)
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STATE_SETG1(state, CHARSET_ASCII)
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return 0;
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}
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#define HAVE_ENCODER_RESET
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ENCODER_RESET(iso2022_jp)
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{
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if (STATE_GETG0(state) != CHARSET_ASCII) {
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RESERVE_OUTBUF(3)
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WRITE3(ESC, '(', 'B')
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STATE_SETG0(state, CHARSET_ASCII)
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NEXT_OUT(3)
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}
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return 0;
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}
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/* ISO-2022-JP changes designations instead of shifting-out */
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ENCODER(iso2022_jp)
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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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if (c < 0x80) {
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switch (STATE_GETG0(state)) {
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case CHARSET_ASCII:
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WRITE1(c)
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NEXT(1, 1)
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break;
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case CHARSET_JISX0201_R:
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JISX0201_R_ENCODE(c, code)
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else { /* FALLTHROUGH (yay!) */
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default:
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WRITE3(ESC, '(', 'B')
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NEXT_OUT(3)
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STATE_SETG0(state, CHARSET_ASCII)
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code = c;
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}
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WRITE1(code)
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NEXT(1, 1)
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break;
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}
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if (c == '\n')
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STATE_CLEARFLAG(state, F_SHIFTED)
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}
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else UCS4INVALID(c)
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else {
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unsigned char charset;
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charset = STATE_GETG0(state);
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if (charset == CHARSET_JISX0201_R) {
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code = DBCINV;
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JISX0201_R_ENCODE(c, code)
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if (code != DBCINV) {
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WRITE1(code)
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NEXT(1, 1)
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continue;
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}
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}
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TRYMAP_ENC(jisxcommon, code, c) {
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if (code & 0x8000) /* MSB set: JIS X 0212 */
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return 1;
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jisx0208encode: if (charset != CHARSET_JISX0208) {
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WRITE3(ESC, '$', 'B')
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STATE_SETG0(state, CHARSET_JISX0208)
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NEXT_OUT(3)
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}
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WRITE2(code >> 8, code & 0xff)
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NEXT(1, 2)
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} else if (c == 0xff3c) { /* FULL-WIDTH REVERSE SOLIDUS */
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code = 0x2140;
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goto jisx0208encode;
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} else {
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JISX0201_R_ENCODE(c, code)
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else
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return 1;
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/* if (charset == CHARSET_JISX0201_R) : already checked */
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WRITE4(ESC, '(', 'J', code)
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STATE_SETG0(state, CHARSET_JISX0201_R)
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NEXT(1, 4)
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}
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}
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}
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return 0;
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}
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#define HAVE_DECODER_INIT
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DECODER_INIT(iso2022_jp)
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{
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STATE_CLEARFLAGS(state)
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STATE_SETG0(state, CHARSET_ASCII)
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STATE_SETG1(state, CHARSET_ASCII)
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return 0;
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}
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#define HAVE_DECODER_RESET
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DECODER_RESET(iso2022_jp)
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{
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STATE_CLEARFLAG(state, F_SHIFTED)
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return 0;
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}
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DECODER(iso2022_jp)
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{
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ISO2022_LOOP_BEGIN
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unsigned char charset, c2;
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ISO2022_GETCHARSET(charset, c)
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if (charset & CHARSET_DOUBLEBYTE) {
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/* all double byte character sets are in JIS X 0208 here.
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* this means that we don't distinguish :1978 from :1983. */
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RESERVE_INBUF(2)
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RESERVE_OUTBUF(1)
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c2 = IN2;
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if (c == 0x21 && c2 == 0x40) { /* FULL-WIDTH REVERSE SOLIDUS */
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**outbuf = 0xff3c;
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NEXT(2, 1)
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} else TRYMAP_DEC(jisx0208, **outbuf, c, c2) {
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NEXT(2, 1)
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} else
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return 2;
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} else if (charset == CHARSET_ASCII) {
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RESERVE_OUTBUF(1)
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OUT1(c)
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NEXT(1, 1)
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} else if (charset == CHARSET_JISX0201_R) {
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RESERVE_OUTBUF(1)
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JISX0201_R_DECODE(c, **outbuf)
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else
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return 1;
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NEXT(1, 1)
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} else
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return MBERR_INTERNAL;
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ISO2022_LOOP_END
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return 0;
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}
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#include "codecentry.h"
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BEGIN_CODEC_REGISTRY(iso2022_jp)
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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(iso2022_jp)
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