晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/jbig_ar.h
/*
 *  Header file for the arithmetic encoder and decoder of
 *  the portable JBIG compression library
 *
 *  Markus Kuhn -- http://www.cl.cam.ac.uk/~mgk25/jbigkit/
 */

#ifndef JBG_AR_H
#define JBG_AR_H

/*
 * Status of arithmetic encoder
 */

struct jbg_arenc_state {
  unsigned char st[4096];    /* probability status for contexts, MSB = MPS */
  unsigned long c;                /* register C: base of coding intervall, *
                                   * layout as in Table 23                 */
  unsigned long a;       /* register A: normalized size of coding interval */
  long sc;     /* number of buffered 0xff values that might still overflow */
  int ct;  /* bit shift counter, determines when next byte will be written */
  int buffer;                /* buffer for most recent output byte != 0xff */
  void (*byte_out)(int, void *);  /* function that receives all PSCD bytes */
  void *file;                              /* parameter passed to byte_out */
};

/*
 * Status of arithmetic decoder
 */

struct jbg_ardec_state {
  unsigned char st[4096];    /* probability status for contexts, MSB = MPS */
  unsigned long c;                /* register C: base of coding intervall, *
                                   * layout as in Table 25                 */
  unsigned long a;       /* register A: normalized size of coding interval */
  unsigned char *pscd_ptr;               /* pointer to next PSCD data byte */
  unsigned char *pscd_end;                   /* pointer to byte after PSCD */
  int ct;    /* bit-shift counter, determines when next byte will be read;
              * special value -1 signals that zero-padding has started     */
  int startup;          /* boolean flag that controls initial fill of s->c */
  int nopadding;        /* boolean flag that triggers return -2 between
			 * reaching PSCD end and decoding the first symbol
			 * that might never have been encoded in the first
			 * place */
};

void arith_encode_init(struct jbg_arenc_state *s, int reuse_st);
void arith_encode_flush(struct jbg_arenc_state *s);
void arith_encode(struct jbg_arenc_state *s, int cx, int pix);
void arith_decode_init(struct jbg_ardec_state *s, int reuse_st);
int  arith_decode(struct jbg_ardec_state *s, int cx);

#endif /* JBG_AR_H */

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