ref: 52cacba37c6f3a125ef931afa4b9c2cdb7438fef
dir: /sys/src/cmd/python/Modules/cjkcodecs/_codecs_cn.c/
/*
* _codecs_cn.c: Codecs collection for Mainland Chinese encodings
*
* Written by Hye-Shik Chang <perky@FreeBSD.org>
*/
#include "cjkcodecs.h"
#include "mappings_cn.h"
/**
* hz is predefined as 100 on AIX. So we undefine it to avoid
* conflict against hz codec's.
*/
#ifdef _AIX
#undef hz
#endif
/* GBK and GB2312 map differently in few codepoints that are listed below:
*
* gb2312 gbk
* A1A4 U+30FB KATAKANA MIDDLE DOT U+00B7 MIDDLE DOT
* A1AA U+2015 HORIZONTAL BAR U+2014 EM DASH
* A844 undefined U+2015 HORIZONTAL BAR
*/
#define GBK_DECODE(dc1, dc2, assi) \
if ((dc1) == 0xa1 && (dc2) == 0xaa) (assi) = 0x2014; \
else if ((dc1) == 0xa8 && (dc2) == 0x44) (assi) = 0x2015; \
else if ((dc1) == 0xa1 && (dc2) == 0xa4) (assi) = 0x00b7; \
else TRYMAP_DEC(gb2312, assi, dc1 ^ 0x80, dc2 ^ 0x80); \
else TRYMAP_DEC(gbkext, assi, dc1, dc2);
#define GBK_ENCODE(code, assi) \
if ((code) == 0x2014) (assi) = 0xa1aa; \
else if ((code) == 0x2015) (assi) = 0xa844; \
else if ((code) == 0x00b7) (assi) = 0xa1a4; \
else if ((code) != 0x30fb && TRYMAP_ENC_COND(gbcommon, assi, code));
/*
* GB2312 codec
*/
ENCODER(gb2312)
{
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(gbcommon, code, c);
else return 1;
if (code & 0x8000) /* MSB set: GBK */
return 1;
OUT1((code >> 8) | 0x80)
OUT2((code & 0xFF) | 0x80)
NEXT(1, 2)
}
return 0;
}
DECODER(gb2312)
{
while (inleft > 0) {
unsigned char c = **inbuf;
REQUIRE_OUTBUF(1)
if (c < 0x80) {
OUT1(c)
NEXT(1, 1)
continue;
}
REQUIRE_INBUF(2)
TRYMAP_DEC(gb2312, **outbuf, c ^ 0x80, IN2 ^ 0x80) {
NEXT(2, 1)
}
else return 2;
}
return 0;
}
/*
* GBK codec
*/
ENCODER(gbk)
{
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)
GBK_ENCODE(c, code)
else return 1;
OUT1((code >> 8) | 0x80)
if (code & 0x8000)
OUT2((code & 0xFF)) /* MSB set: GBK */
else
OUT2((code & 0xFF) | 0x80) /* MSB unset: GB2312 */
NEXT(1, 2)
}
return 0;
}
DECODER(gbk)
{
while (inleft > 0) {
unsigned char c = IN1;
REQUIRE_OUTBUF(1)
if (c < 0x80) {
OUT1(c)
NEXT(1, 1)
continue;
}
REQUIRE_INBUF(2)
GBK_DECODE(c, IN2, **outbuf)
else return 2;
NEXT(2, 1)
}
return 0;
}
/*
* GB18030 codec
*/
ENCODER(gb18030)
{
while (inleft > 0) {
ucs4_t c = IN1;
DBCHAR code;
if (c < 0x80) {
WRITE1(c)
NEXT(1, 1)
continue;
}
DECODE_SURROGATE(c)
if (c > 0x10FFFF)
#if Py_UNICODE_SIZE == 2
return 2; /* surrogates pair */
#else
return 1;
#endif
else if (c >= 0x10000) {
ucs4_t tc = c - 0x10000;
REQUIRE_OUTBUF(4)
OUT4((unsigned char)(tc % 10) + 0x30)
tc /= 10;
OUT3((unsigned char)(tc % 126) + 0x81)
tc /= 126;
OUT2((unsigned char)(tc % 10) + 0x30)
tc /= 10;
OUT1((unsigned char)(tc + 0x90))
#if Py_UNICODE_SIZE == 2
NEXT(2, 4) /* surrogates pair */
#else
NEXT(1, 4)
#endif
continue;
}
REQUIRE_OUTBUF(2)
GBK_ENCODE(c, code)
else {
const struct _gb18030_to_unibmp_ranges *utrrange;
REQUIRE_OUTBUF(4)
for (utrrange = gb18030_to_unibmp_ranges;
utrrange->first != 0;
utrrange++)
if (utrrange->first <= c &&
c <= utrrange->last) {
Py_UNICODE tc;
tc = c - utrrange->first +
utrrange->base;
OUT4((unsigned char)(tc % 10) + 0x30)
tc /= 10;
OUT3((unsigned char)(tc % 126) + 0x81)
tc /= 126;
OUT2((unsigned char)(tc % 10) + 0x30)
tc /= 10;
OUT1((unsigned char)tc + 0x81)
NEXT(1, 4)
break;
}
if (utrrange->first == 0)
return 1;
continue;
}
OUT1((code >> 8) | 0x80)
if (code & 0x8000)
OUT2((code & 0xFF)) /* MSB set: GBK or GB18030ext */
else
OUT2((code & 0xFF) | 0x80) /* MSB unset: GB2312 */
NEXT(1, 2)
}
return 0;
}
DECODER(gb18030)
{
while (inleft > 0) {
unsigned char c = IN1, c2;
REQUIRE_OUTBUF(1)
if (c < 0x80) {
OUT1(c)
NEXT(1, 1)
continue;
}
REQUIRE_INBUF(2)
c2 = IN2;
if (c2 >= 0x30 && c2 <= 0x39) { /* 4 bytes seq */
const struct _gb18030_to_unibmp_ranges *utr;
unsigned char c3, c4;
ucs4_t lseq;
REQUIRE_INBUF(4)
c3 = IN3;
c4 = IN4;
if (c < 0x81 || c3 < 0x81 || c4 < 0x30 || c4 > 0x39)
return 4;
c -= 0x81; c2 -= 0x30;
c3 -= 0x81; c4 -= 0x30;
if (c < 4) { /* U+0080 - U+FFFF */
lseq = ((ucs4_t)c * 10 + c2) * 1260 +
(ucs4_t)c3 * 10 + c4;
if (lseq < 39420) {
for (utr = gb18030_to_unibmp_ranges;
lseq >= (utr + 1)->base;
utr++) ;
OUT1(utr->first - utr->base + lseq)
NEXT(4, 1)
continue;
}
}
else if (c >= 15) { /* U+10000 - U+10FFFF */
lseq = 0x10000 + (((ucs4_t)c-15) * 10 + c2)
* 1260 + (ucs4_t)c3 * 10 + c4;
if (lseq <= 0x10FFFF) {
WRITEUCS4(lseq);
NEXT_IN(4)
continue;
}
}
return 4;
}
GBK_DECODE(c, c2, **outbuf)
else TRYMAP_DEC(gb18030ext, **outbuf, c, c2);
else return 2;
NEXT(2, 1)
}
return 0;
}
/*
* HZ codec
*/
ENCODER_INIT(hz)
{
state->i = 0;
return 0;
}
ENCODER_RESET(hz)
{
if (state->i != 0) {
WRITE2('~', '}')
state->i = 0;
NEXT_OUT(2)
}
return 0;
}
ENCODER(hz)
{
while (inleft > 0) {
Py_UNICODE c = IN1;
DBCHAR code;
if (c < 0x80) {
if (state->i == 0) {
WRITE1((unsigned char)c)
NEXT(1, 1)
}
else {
WRITE3('~', '}', (unsigned char)c)
NEXT(1, 3)
state->i = 0;
}
continue;
}
UCS4INVALID(c)
TRYMAP_ENC(gbcommon, code, c);
else return 1;
if (code & 0x8000) /* MSB set: GBK */
return 1;
if (state->i == 0) {
WRITE4('~', '{', code >> 8, code & 0xff)
NEXT(1, 4)
state->i = 1;
}
else {
WRITE2(code >> 8, code & 0xff)
NEXT(1, 2)
}
}
return 0;
}
DECODER_INIT(hz)
{
state->i = 0;
return 0;
}
DECODER_RESET(hz)
{
state->i = 0;
return 0;
}
DECODER(hz)
{
while (inleft > 0) {
unsigned char c = IN1;
if (c == '~') {
unsigned char c2 = IN2;
REQUIRE_INBUF(2)
if (c2 == '~') {
WRITE1('~')
NEXT(2, 1)
continue;
}
else if (c2 == '{' && state->i == 0)
state->i = 1; /* set GB */
else if (c2 == '}' && state->i == 1)
state->i = 0; /* set ASCII */
else if (c2 == '\n')
; /* line-continuation */
else
return 2;
NEXT(2, 0);
continue;
}
if (c & 0x80)
return 1;
if (state->i == 0) { /* ASCII mode */
WRITE1(c)
NEXT(1, 1)
}
else { /* GB mode */
REQUIRE_INBUF(2)
REQUIRE_OUTBUF(1)
TRYMAP_DEC(gb2312, **outbuf, c, IN2) {
NEXT(2, 1)
}
else
return 2;
}
}
return 0;
}
BEGIN_MAPPINGS_LIST
MAPPING_DECONLY(gb2312)
MAPPING_DECONLY(gbkext)
MAPPING_ENCONLY(gbcommon)
MAPPING_ENCDEC(gb18030ext)
END_MAPPINGS_LIST
BEGIN_CODECS_LIST
CODEC_STATELESS(gb2312)
CODEC_STATELESS(gbk)
CODEC_STATELESS(gb18030)
CODEC_STATEFUL(hz)
END_CODECS_LIST
I_AM_A_MODULE_FOR(cn)