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/*
* _hz.c: the HZ codec (RFC1843)
*
* Written by Hye-Shik Chang <perky@FreeBSD.org>
* $CJKCodecs: _hz.c,v 1.2 2003/12/31 05:46:55 perky Exp $
*/
#include "codeccommon.h"
ENCMAP(gbcommon)
DECMAP(gb2312)
#define HAVE_ENCODER_INIT
ENCODER_INIT(hz)
{
state->i = 0;
return 0;
}
#define HAVE_ENCODER_RESET
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(c)
NEXT(1, 1)
} else {
WRITE3('~', '}', 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;
}
#define HAVE_DECODER_INIT
DECODER_INIT(hz)
{
state->i = 0;
return 0;
}
#define HAVE_DECODER_RESET
DECODER_RESET(hz)
{
state->i = 0;
return 0;
}
DECODER(hz)
{
while (inleft > 0) {
unsigned char c = IN1;
if (c == '~') {
unsigned char c2 = IN2;
RESERVE_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 */
RESERVE_INBUF(2)
RESERVE_OUTBUF(1)
TRYMAP_DEC(gb2312, **outbuf, c, IN2) {
NEXT(2, 1)
} else
return 2;
}
}
return 0;
}
#include "codecentry.h"
BEGIN_CODEC_REGISTRY(hz)
MAPOPEN(zh_CN)
IMPORTMAP_DEC(gb2312)
IMPORTMAP_ENC(gbcommon)
MAPCLOSE()
END_CODEC_REGISTRY(hz)
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