cpython/Modules/cjkcodecs/_codecs_cn.c

471 lines
11 KiB
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 code points 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, writer) \
if ((dc1) == 0xa1 && (dc2) == 0xaa) { \
OUTCHAR(0x2014); \
} \
else if ((dc1) == 0xa8 && (dc2) == 0x44) { \
OUTCHAR(0x2015); \
} \
else if ((dc1) == 0xa1 && (dc2) == 0xa4) { \
OUTCHAR(0x00b7); \
} \
else if (TRYMAP_DEC(gb2312, decoded, dc1 ^ 0x80, dc2 ^ 0x80)) { \
OUTCHAR(decoded); \
} \
else if (TRYMAP_DEC(gbkext, decoded, dc1, dc2)) { \
OUTCHAR(decoded); \
}
#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(gbcommon, assi, code)) { \
; \
}
/*
* codecs in this file use the first byte of MultibyteCodec_State.c[8]
* to store a 0 or 1 state value
*/
#define CN_STATE_OFFSET 0
/*
* GB2312 codec
*/
ENCODER(gb2312)
{
while (*inpos < inlen) {
Py_UCS4 c = INCHAR1;
DBCHAR code;
if (c < 0x80) {
WRITEBYTE1((unsigned char)c);
NEXT(1, 1);
continue;
}
if (c > 0xFFFF)
return 1;
REQUIRE_OUTBUF(2);
if (TRYMAP_ENC(gbcommon, code, c))
;
else
return 1;
if (code & 0x8000) /* MSB set: GBK */
return 1;
OUTBYTE1((code >> 8) | 0x80);
OUTBYTE2((code & 0xFF) | 0x80);
NEXT(1, 2);
}
return 0;
}
DECODER(gb2312)
{
while (inleft > 0) {
unsigned char c = **inbuf;
Py_UCS4 decoded;
if (c < 0x80) {
OUTCHAR(c);
NEXT_IN(1);
continue;
}
REQUIRE_INBUF(2);
if (TRYMAP_DEC(gb2312, decoded, c ^ 0x80, INBYTE2 ^ 0x80)) {
OUTCHAR(decoded);
NEXT_IN(2);
}
else
return 1;
}
return 0;
}
/*
* GBK codec
*/
ENCODER(gbk)
{
while (*inpos < inlen) {
Py_UCS4 c = INCHAR1;
DBCHAR code;
if (c < 0x80) {
WRITEBYTE1((unsigned char)c);
NEXT(1, 1);
continue;
}
if (c > 0xFFFF)
return 1;
REQUIRE_OUTBUF(2);
GBK_ENCODE(c, code)
else
return 1;
OUTBYTE1((code >> 8) | 0x80);
if (code & 0x8000)
OUTBYTE2((code & 0xFF)); /* MSB set: GBK */
else
OUTBYTE2((code & 0xFF) | 0x80); /* MSB unset: GB2312 */
NEXT(1, 2);
}
return 0;
}
DECODER(gbk)
{
while (inleft > 0) {
unsigned char c = INBYTE1;
Py_UCS4 decoded;
if (c < 0x80) {
OUTCHAR(c);
NEXT_IN(1);
continue;
}
REQUIRE_INBUF(2);
GBK_DECODE(c, INBYTE2, writer)
else
return 1;
NEXT_IN(2);
}
return 0;
}
/*
* GB18030 codec
*/
ENCODER(gb18030)
{
while (*inpos < inlen) {
Py_UCS4 c = INCHAR1;
DBCHAR code;
if (c < 0x80) {
WRITEBYTE1(c);
NEXT(1, 1);
continue;
}
if (c >= 0x10000) {
Py_UCS4 tc = c - 0x10000;
assert (c <= 0x10FFFF);
REQUIRE_OUTBUF(4);
OUTBYTE4((unsigned char)(tc % 10) + 0x30);
tc /= 10;
OUTBYTE3((unsigned char)(tc % 126) + 0x81);
tc /= 126;
OUTBYTE2((unsigned char)(tc % 10) + 0x30);
tc /= 10;
OUTBYTE1((unsigned char)(tc + 0x90));
NEXT(1, 4);
continue;
}
REQUIRE_OUTBUF(2);
GBK_ENCODE(c, code)
else if (TRYMAP_ENC(gb18030ext, code, c))
;
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_UCS4 tc;
tc = c - utrrange->first +
utrrange->base;
OUTBYTE4((unsigned char)(tc % 10) + 0x30);
tc /= 10;
OUTBYTE3((unsigned char)(tc % 126) + 0x81);
tc /= 126;
OUTBYTE2((unsigned char)(tc % 10) + 0x30);
tc /= 10;
OUTBYTE1((unsigned char)tc + 0x81);
NEXT(1, 4);
break;
}
if (utrrange->first == 0)
return 1;
continue;
}
OUTBYTE1((code >> 8) | 0x80);
if (code & 0x8000)
OUTBYTE2((code & 0xFF)); /* MSB set: GBK or GB18030ext */
else
OUTBYTE2((code & 0xFF) | 0x80); /* MSB unset: GB2312 */
NEXT(1, 2);
}
return 0;
}
DECODER(gb18030)
{
while (inleft > 0) {
unsigned char c = INBYTE1, c2;
Py_UCS4 decoded;
if (c < 0x80) {
OUTCHAR(c);
NEXT_IN(1);
continue;
}
REQUIRE_INBUF(2);
c2 = INBYTE2;
if (c2 >= 0x30 && c2 <= 0x39) { /* 4 bytes seq */
const struct _gb18030_to_unibmp_ranges *utr;
unsigned char c3, c4;
Py_UCS4 lseq;
REQUIRE_INBUF(4);
c3 = INBYTE3;
c4 = INBYTE4;
if (c < 0x81 || c > 0xFE ||
c3 < 0x81 || c3 > 0xFE ||
c4 < 0x30 || c4 > 0x39)
return 1;
c -= 0x81; c2 -= 0x30;
c3 -= 0x81; c4 -= 0x30;
if (c < 4) { /* U+0080 - U+FFFF */
lseq = ((Py_UCS4)c * 10 + c2) * 1260 +
(Py_UCS4)c3 * 10 + c4;
if (lseq < 39420) {
for (utr = gb18030_to_unibmp_ranges;
lseq >= (utr + 1)->base;
utr++) ;
OUTCHAR(utr->first - utr->base + lseq);
NEXT_IN(4);
continue;
}
}
else if (c >= 15) { /* U+10000 - U+10FFFF */
lseq = 0x10000 + (((Py_UCS4)c-15) * 10 + c2)
* 1260 + (Py_UCS4)c3 * 10 + c4;
if (lseq <= 0x10FFFF) {
OUTCHAR(lseq);
NEXT_IN(4);
continue;
}
}
return 1;
}
GBK_DECODE(c, c2, writer)
else if (TRYMAP_DEC(gb18030ext, decoded, c, c2))
OUTCHAR(decoded);
else
return 1;
NEXT_IN(2);
}
return 0;
}
/*
* HZ codec
*/
ENCODER_INIT(hz)
{
state->c[CN_STATE_OFFSET] = 0;
return 0;
}
ENCODER_RESET(hz)
{
if (state->c[CN_STATE_OFFSET] != 0) {
WRITEBYTE2('~', '}');
state->c[CN_STATE_OFFSET] = 0;
NEXT_OUT(2);
}
return 0;
}
ENCODER(hz)
{
while (*inpos < inlen) {
Py_UCS4 c = INCHAR1;
DBCHAR code;
if (c < 0x80) {
if (state->c[CN_STATE_OFFSET]) {
WRITEBYTE2('~', '}');
NEXT_OUT(2);
state->c[CN_STATE_OFFSET] = 0;
}
WRITEBYTE1((unsigned char)c);
NEXT(1, 1);
if (c == '~') {
WRITEBYTE1('~');
NEXT_OUT(1);
}
continue;
}
if (c > 0xFFFF)
return 1;
if (TRYMAP_ENC(gbcommon, code, c))
;
else
return 1;
if (code & 0x8000) /* MSB set: GBK */
return 1;
if (state->c[CN_STATE_OFFSET] == 0) {
WRITEBYTE4('~', '{', code >> 8, code & 0xff);
NEXT(1, 4);
state->c[CN_STATE_OFFSET] = 1;
}
else {
WRITEBYTE2(code >> 8, code & 0xff);
NEXT(1, 2);
}
}
return 0;
}
DECODER_INIT(hz)
{
state->c[CN_STATE_OFFSET] = 0;
return 0;
}
DECODER_RESET(hz)
{
state->c[CN_STATE_OFFSET] = 0;
return 0;
}
DECODER(hz)
{
while (inleft > 0) {
unsigned char c = INBYTE1;
Py_UCS4 decoded;
if (c == '~') {
unsigned char c2 = INBYTE2;
REQUIRE_INBUF(2);
if (c2 == '~' && state->c[CN_STATE_OFFSET] == 0)
OUTCHAR('~');
else if (c2 == '{' && state->c[CN_STATE_OFFSET] == 0)
state->c[CN_STATE_OFFSET] = 1; /* set GB */
else if (c2 == '\n' && state->c[CN_STATE_OFFSET] == 0)
; /* line-continuation */
else if (c2 == '}' && state->c[CN_STATE_OFFSET] == 1)
state->c[CN_STATE_OFFSET] = 0; /* set ASCII */
else
return 1;
NEXT_IN(2);
continue;
}
if (c & 0x80)
return 1;
if (state->c[CN_STATE_OFFSET] == 0) { /* ASCII mode */
OUTCHAR(c);
NEXT_IN(1);
}
else { /* GB mode */
REQUIRE_INBUF(2);
if (TRYMAP_DEC(gb2312, decoded, c, INBYTE2)) {
OUTCHAR(decoded);
NEXT_IN(2);
}
else
return 1;
}
}
return 0;
}
BEGIN_MAPPINGS_LIST(4)
MAPPING_DECONLY(gb2312)
MAPPING_DECONLY(gbkext)
MAPPING_ENCONLY(gbcommon)
MAPPING_ENCDEC(gb18030ext)
END_MAPPINGS_LIST
BEGIN_CODECS_LIST(4)
CODEC_STATELESS(gb2312)
CODEC_STATELESS(gbk)
CODEC_STATELESS(gb18030)
CODEC_STATEFUL(hz)
END_CODECS_LIST
I_AM_A_MODULE_FOR(cn)