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/gd_io.h
#ifdef __cplusplus
extern "C" {
#endif

#ifndef GD_IO_H
#define GD_IO_H 1

#include <stdio.h>

#ifdef VMS
#	define Putchar gdPutchar
#endif

/*
  Group: Types

  typedef: gdIOCtx

  gdIOCtx structures hold function pointers for doing image IO.
  
  Most of the gd functions that read and write files, such as
  <gdImagePng> also have variants that accept a <gdIOCtx> structure;
  see <gdImagePngCtx> and <gdImageCreateFromJpegCtx>.

  Those who wish to provide their own custom routines to read and
  write images can populate a gdIOCtx structure with functions of
  their own devising to to read and write data. For image reading, the
  only mandatory functions are getC and getBuf, which must return the
  number of characters actually read, or a negative value on error or
  EOF. These functions must read the number of characters requested
  unless at the end of the file.

  For image writing, the only mandatory functions are putC and putBuf,
  which return the number of characters written; these functions must
  write the number of characters requested except in the event of an
  error. The seek and tell functions are only required in conjunction
  with the gd2 file format, which supports quick loading of partial
  images. The gd_free function will not be invoked when calling the
  standard Ctx functions; it is an implementation convenience when
  adding new data types to gd. For examples, see gd_png.c, gd_gd2.c,
  gd_jpeg.c, etc., all of which rely on gdIOCtx to implement the
  standard image read and write functions.

  > typedef struct gdIOCtx
  > {
  >   int (*getC) (struct gdIOCtx *);
  >   int (*getBuf) (struct gdIOCtx *, void *, int wanted);
  > 
  >   void (*putC) (struct gdIOCtx *, int);
  >   int (*putBuf) (struct gdIOCtx *, const void *, int wanted);
  > 
  >   // seek must return 1 on SUCCESS, 0 on FAILURE. Unlike fseek! 
  >   int (*seek) (struct gdIOCtx *, const int);
  >   long (*tell) (struct gdIOCtx *);
  > 
  >   void (*gd_free) (struct gdIOCtx *);
  > } gdIOCtx;




 */
typedef struct gdIOCtx {
    int (*getC)(struct gdIOCtx *);
    int (*getBuf)(struct gdIOCtx *, void *, int);
    void (*putC)(struct gdIOCtx *, int);
    int (*putBuf)(struct gdIOCtx *, const void *, int);
    /* seek must return 1 on SUCCESS, 0 on FAILURE. Unlike fseek! */
    int (*seek)(struct gdIOCtx *, const int);
    long (*tell)(struct gdIOCtx *);
    void (*gd_free)(struct gdIOCtx *);
    void *data;
} gdIOCtx;

typedef struct gdIOCtx *gdIOCtxPtr;

void Putword(int w, gdIOCtx *ctx);
void Putchar(int c, gdIOCtx *ctx);

void gdPutC(const unsigned char c, gdIOCtx *ctx);
int gdPutBuf(const void *, int, gdIOCtx *);
void gdPutWord(int w, gdIOCtx *ctx);
void gdPutInt(int w, gdIOCtx *ctx);

int gdGetC(gdIOCtx *ctx);
int gdGetBuf(void *, int, gdIOCtx *);
int gdGetByte(int *result, gdIOCtx *ctx);
int gdGetWord(int *result, gdIOCtx *ctx);
int gdGetWordLSB(signed short int *result, gdIOCtx *ctx);
int gdGetInt(int *result, gdIOCtx *ctx);
int gdGetIntLSB(signed int *result, gdIOCtx *ctx);

int gdSeek(gdIOCtx *ctx, const int offset);
long gdTell(gdIOCtx *ctx);

#endif

#ifdef __cplusplus
}
#endif

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