#ifdef __cplusplus
extern "C" {
#endif

#ifndef GD_IO_H
#define GD_IO_H 1

#include <stdio.h>

#ifdef VMS
#	define Putchar gdPutchar
#endif

	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