Modules/cjkcodecs/_gb2312.c

   1 /*
   2  * _gb2312.c: the GB2312 codec
   3  *
   4  * Written by Hye-Shik Chang <perky@FreeBSD.org>
   5  * $CJKCodecs: _gb2312.c,v 1.2 2003/12/31 05:46:55 perky Exp $
   6  */
   7
   8 #include "codeccommon.h"
   9
  10 ENCMAP(gbcommon)
  11 DECMAP(gb2312)
  12
  13 ENCODER(gb2312)
  14 {
  15     while (inleft > 0) {
  16         Py_UNICODE  c = IN1;
  17         DBCHAR      code;
  18
  19         if (c < 0x80) {
  20             WRITE1((unsigned char)c)
  21             NEXT(1, 1)
  22             continue;
  23         }
  24         UCS4INVALID(c)
  25
  26         RESERVE_OUTBUF(2)
  27         TRYMAP_ENC(gbcommon, code, c);
  28         else return 1;
  29
  30         if (code & 0x8000) /* MSB set: GBK */
  31             return 1;
  32
  33         OUT1((code >> 8) | 0x80)
  34         OUT2((code & 0xFF) | 0x80)
  35         NEXT(1, 2)
  36     }
  37
  38     return 0;
  39 }
  40
  41 DECODER(gb2312)
  42 {
  43     while (inleft > 0) {
  44         unsigned char    c = **inbuf;
  45
  46         RESERVE_OUTBUF(1)
  47
  48         if (c < 0x80) {
  49             OUT1(c)
  50             NEXT(1, 1)
  51             continue;
  52         }
  53
  54         RESERVE_INBUF(2)
  55         TRYMAP_DEC(gb2312, **outbuf, c ^ 0x80, IN2 ^ 0x80) {
  56             NEXT(2, 1)
  57         } else return 2;
  58     }
  59
  60     return 0;
  61 }
  62
  63 #include "codecentry.h"
  64 BEGIN_CODEC_REGISTRY(gb2312)
  65     MAPOPEN(zh_CN)
  66         IMPORTMAP_DEC(gb2312)
  67         IMPORTMAP_ENC(gbcommon)
  68     MAPCLOSE()
  69 END_CODEC_REGISTRY(gb2312)