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ac22f6aa98
This implements getstate and setstate for the cjkcodecs multibyte incremental encoders/decoders, primarily to fix issues with seek/tell. The encoder getstate/setstate is slightly tricky as the "state" is pending bytes + MultibyteCodec_State but only an integer can be returned. The approach I've taken is to encode this data into a long, similar to how .tell() encodes a "cookie_type" as a long. https://bugs.python.org/issue33578
470 lines
11 KiB
C
470 lines
11 KiB
C
/*
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* _codecs_cn.c: Codecs collection for Mainland Chinese encodings
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*
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* Written by Hye-Shik Chang <perky@FreeBSD.org>
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*/
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#include "cjkcodecs.h"
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#include "mappings_cn.h"
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/**
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* hz is predefined as 100 on AIX. So we undefine it to avoid
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* conflict against hz codec's.
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*/
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#ifdef _AIX
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#undef hz
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#endif
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/* GBK and GB2312 map differently in few code points that are listed below:
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*
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* gb2312 gbk
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* A1A4 U+30FB KATAKANA MIDDLE DOT U+00B7 MIDDLE DOT
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* A1AA U+2015 HORIZONTAL BAR U+2014 EM DASH
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* A844 undefined U+2015 HORIZONTAL BAR
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*/
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#define GBK_DECODE(dc1, dc2, writer) \
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if ((dc1) == 0xa1 && (dc2) == 0xaa) { \
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OUTCHAR(0x2014); \
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} \
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else if ((dc1) == 0xa8 && (dc2) == 0x44) { \
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OUTCHAR(0x2015); \
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} \
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else if ((dc1) == 0xa1 && (dc2) == 0xa4) { \
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OUTCHAR(0x00b7); \
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} \
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else if (TRYMAP_DEC(gb2312, decoded, dc1 ^ 0x80, dc2 ^ 0x80)) { \
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OUTCHAR(decoded); \
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} \
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else if (TRYMAP_DEC(gbkext, decoded, dc1, dc2)) { \
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OUTCHAR(decoded); \
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}
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#define GBK_ENCODE(code, assi) \
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if ((code) == 0x2014) { \
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(assi) = 0xa1aa; \
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} else if ((code) == 0x2015) { \
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(assi) = 0xa844; \
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} else if ((code) == 0x00b7) { \
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(assi) = 0xa1a4; \
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} else if ((code) != 0x30fb && TRYMAP_ENC(gbcommon, assi, code)) { \
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; \
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}
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/*
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* codecs in this file use the first byte of MultibyteCodec_State.c[8]
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* to store a 0 or 1 state value
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*/
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#define CN_STATE_OFFSET 0
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/*
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* GB2312 codec
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*/
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ENCODER(gb2312)
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{
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while (*inpos < inlen) {
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Py_UCS4 c = INCHAR1;
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DBCHAR code;
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if (c < 0x80) {
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WRITEBYTE1((unsigned char)c);
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NEXT(1, 1);
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continue;
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}
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if (c > 0xFFFF)
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return 1;
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REQUIRE_OUTBUF(2);
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if (TRYMAP_ENC(gbcommon, code, c))
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;
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else
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return 1;
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if (code & 0x8000) /* MSB set: GBK */
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return 1;
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OUTBYTE1((code >> 8) | 0x80);
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OUTBYTE2((code & 0xFF) | 0x80);
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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(gb2312)
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{
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while (inleft > 0) {
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unsigned char c = **inbuf;
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Py_UCS4 decoded;
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if (c < 0x80) {
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OUTCHAR(c);
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NEXT_IN(1);
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continue;
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}
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REQUIRE_INBUF(2);
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if (TRYMAP_DEC(gb2312, decoded, c ^ 0x80, INBYTE2 ^ 0x80)) {
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OUTCHAR(decoded);
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NEXT_IN(2);
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}
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else
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return 1;
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}
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return 0;
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}
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/*
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* GBK codec
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*/
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ENCODER(gbk)
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{
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while (*inpos < inlen) {
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Py_UCS4 c = INCHAR1;
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DBCHAR code;
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if (c < 0x80) {
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WRITEBYTE1((unsigned char)c);
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NEXT(1, 1);
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continue;
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}
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if (c > 0xFFFF)
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return 1;
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REQUIRE_OUTBUF(2);
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GBK_ENCODE(c, code)
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else
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return 1;
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OUTBYTE1((code >> 8) | 0x80);
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if (code & 0x8000)
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OUTBYTE2((code & 0xFF)); /* MSB set: GBK */
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else
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OUTBYTE2((code & 0xFF) | 0x80); /* MSB unset: GB2312 */
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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(gbk)
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{
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while (inleft > 0) {
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unsigned char c = INBYTE1;
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Py_UCS4 decoded;
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if (c < 0x80) {
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OUTCHAR(c);
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NEXT_IN(1);
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continue;
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}
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REQUIRE_INBUF(2);
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GBK_DECODE(c, INBYTE2, writer)
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else
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return 1;
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NEXT_IN(2);
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}
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return 0;
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}
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/*
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* GB18030 codec
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*/
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ENCODER(gb18030)
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{
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while (*inpos < inlen) {
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Py_UCS4 c = INCHAR1;
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DBCHAR code;
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if (c < 0x80) {
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WRITEBYTE1(c);
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NEXT(1, 1);
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continue;
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}
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if (c >= 0x10000) {
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Py_UCS4 tc = c - 0x10000;
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assert (c <= 0x10FFFF);
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REQUIRE_OUTBUF(4);
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OUTBYTE4((unsigned char)(tc % 10) + 0x30);
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tc /= 10;
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OUTBYTE3((unsigned char)(tc % 126) + 0x81);
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tc /= 126;
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OUTBYTE2((unsigned char)(tc % 10) + 0x30);
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tc /= 10;
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OUTBYTE1((unsigned char)(tc + 0x90));
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NEXT(1, 4);
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continue;
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}
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REQUIRE_OUTBUF(2);
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GBK_ENCODE(c, code)
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else if (TRYMAP_ENC(gb18030ext, code, c))
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;
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else {
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const struct _gb18030_to_unibmp_ranges *utrrange;
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REQUIRE_OUTBUF(4);
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for (utrrange = gb18030_to_unibmp_ranges;
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utrrange->first != 0;
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utrrange++)
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if (utrrange->first <= c &&
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c <= utrrange->last) {
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Py_UCS4 tc;
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tc = c - utrrange->first +
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utrrange->base;
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OUTBYTE4((unsigned char)(tc % 10) + 0x30);
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tc /= 10;
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OUTBYTE3((unsigned char)(tc % 126) + 0x81);
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tc /= 126;
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OUTBYTE2((unsigned char)(tc % 10) + 0x30);
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tc /= 10;
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OUTBYTE1((unsigned char)tc + 0x81);
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NEXT(1, 4);
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break;
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}
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if (utrrange->first == 0)
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return 1;
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continue;
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}
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OUTBYTE1((code >> 8) | 0x80);
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if (code & 0x8000)
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OUTBYTE2((code & 0xFF)); /* MSB set: GBK or GB18030ext */
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else
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OUTBYTE2((code & 0xFF) | 0x80); /* MSB unset: GB2312 */
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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(gb18030)
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{
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while (inleft > 0) {
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unsigned char c = INBYTE1, c2;
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Py_UCS4 decoded;
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if (c < 0x80) {
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OUTCHAR(c);
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NEXT_IN(1);
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continue;
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}
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REQUIRE_INBUF(2);
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c2 = INBYTE2;
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if (c2 >= 0x30 && c2 <= 0x39) { /* 4 bytes seq */
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const struct _gb18030_to_unibmp_ranges *utr;
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unsigned char c3, c4;
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Py_UCS4 lseq;
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REQUIRE_INBUF(4);
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c3 = INBYTE3;
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c4 = INBYTE4;
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if (c < 0x81 || c > 0xFE ||
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c3 < 0x81 || c3 > 0xFE ||
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c4 < 0x30 || c4 > 0x39)
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return 1;
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c -= 0x81; c2 -= 0x30;
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c3 -= 0x81; c4 -= 0x30;
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if (c < 4) { /* U+0080 - U+FFFF */
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lseq = ((Py_UCS4)c * 10 + c2) * 1260 +
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(Py_UCS4)c3 * 10 + c4;
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if (lseq < 39420) {
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for (utr = gb18030_to_unibmp_ranges;
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lseq >= (utr + 1)->base;
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utr++) ;
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OUTCHAR(utr->first - utr->base + lseq);
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NEXT_IN(4);
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continue;
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}
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}
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else if (c >= 15) { /* U+10000 - U+10FFFF */
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lseq = 0x10000 + (((Py_UCS4)c-15) * 10 + c2)
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* 1260 + (Py_UCS4)c3 * 10 + c4;
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if (lseq <= 0x10FFFF) {
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OUTCHAR(lseq);
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NEXT_IN(4);
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continue;
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}
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}
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return 1;
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}
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GBK_DECODE(c, c2, writer)
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else if (TRYMAP_DEC(gb18030ext, decoded, c, c2))
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OUTCHAR(decoded);
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else
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return 1;
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NEXT_IN(2);
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}
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return 0;
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}
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/*
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* HZ codec
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*/
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ENCODER_INIT(hz)
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{
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state->c[CN_STATE_OFFSET] = 0;
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return 0;
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}
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ENCODER_RESET(hz)
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{
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if (state->c[CN_STATE_OFFSET] != 0) {
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WRITEBYTE2('~', '}');
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state->c[CN_STATE_OFFSET] = 0;
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NEXT_OUT(2);
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}
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return 0;
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}
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ENCODER(hz)
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{
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while (*inpos < inlen) {
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Py_UCS4 c = INCHAR1;
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DBCHAR code;
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if (c < 0x80) {
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if (state->c[CN_STATE_OFFSET]) {
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WRITEBYTE2('~', '}');
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NEXT_OUT(2);
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state->c[CN_STATE_OFFSET] = 0;
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}
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WRITEBYTE1((unsigned char)c);
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NEXT(1, 1);
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if (c == '~') {
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WRITEBYTE1('~');
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NEXT_OUT(1);
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}
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continue;
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}
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if (c > 0xFFFF)
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return 1;
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if (TRYMAP_ENC(gbcommon, code, c))
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;
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else
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return 1;
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if (code & 0x8000) /* MSB set: GBK */
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return 1;
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if (state->c[CN_STATE_OFFSET] == 0) {
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WRITEBYTE4('~', '{', code >> 8, code & 0xff);
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NEXT(1, 4);
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state->c[CN_STATE_OFFSET] = 1;
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}
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else {
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WRITEBYTE2(code >> 8, code & 0xff);
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NEXT(1, 2);
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}
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}
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return 0;
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}
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DECODER_INIT(hz)
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{
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state->c[CN_STATE_OFFSET] = 0;
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return 0;
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}
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DECODER_RESET(hz)
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{
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state->c[CN_STATE_OFFSET] = 0;
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return 0;
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}
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DECODER(hz)
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{
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while (inleft > 0) {
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unsigned char c = INBYTE1;
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Py_UCS4 decoded;
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if (c == '~') {
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unsigned char c2 = INBYTE2;
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REQUIRE_INBUF(2);
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if (c2 == '~' && state->c[CN_STATE_OFFSET] == 0)
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OUTCHAR('~');
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else if (c2 == '{' && state->c[CN_STATE_OFFSET] == 0)
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state->c[CN_STATE_OFFSET] = 1; /* set GB */
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else if (c2 == '\n' && state->c[CN_STATE_OFFSET] == 0)
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; /* line-continuation */
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else if (c2 == '}' && state->c[CN_STATE_OFFSET] == 1)
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state->c[CN_STATE_OFFSET] = 0; /* set ASCII */
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else
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return 1;
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NEXT_IN(2);
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continue;
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}
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if (c & 0x80)
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return 1;
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if (state->c[CN_STATE_OFFSET] == 0) { /* ASCII mode */
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OUTCHAR(c);
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NEXT_IN(1);
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}
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else { /* GB mode */
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REQUIRE_INBUF(2);
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if (TRYMAP_DEC(gb2312, decoded, c, INBYTE2)) {
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OUTCHAR(decoded);
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NEXT_IN(2);
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}
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else
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return 1;
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}
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}
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return 0;
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}
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BEGIN_MAPPINGS_LIST
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MAPPING_DECONLY(gb2312)
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MAPPING_DECONLY(gbkext)
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MAPPING_ENCONLY(gbcommon)
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MAPPING_ENCDEC(gb18030ext)
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END_MAPPINGS_LIST
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BEGIN_CODECS_LIST
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CODEC_STATELESS(gb2312)
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CODEC_STATELESS(gbk)
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CODEC_STATELESS(gb18030)
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CODEC_STATEFUL(hz)
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END_CODECS_LIST
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I_AM_A_MODULE_FOR(cn)
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