/* $Id: istream.h,v 1.4 2001/11/24 02:01:26 ukai Exp $ */
#ifndef IO_STREAM_H
#define IO_STREAM_H

#include <stdio.h>
#ifdef USE_SSL
#include <bio.h>
#include <x509.h>
#include <ssl.h>
#endif
#include "Str.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

struct stream_buffer {
    unsigned char *buf;
    int size, cur, next;
};

typedef struct stream_buffer *StreamBuffer;

struct file_handle {
    FILE *f;
    void (*close) ();
};

#ifdef USE_SSL
struct ssl_handle {
    SSL *ssl;
    int sock;
};
#endif

union input_stream;

struct ens_handle {
    union input_stream *is;
    Str s;
    int pos;
    char encoding;
};


struct base_stream {
    struct stream_buffer stream;
    void *handle;
    char type;
    char iseos;
    int (*read) ();
    void (*close) ();
};

struct file_stream {
    struct stream_buffer stream;
    struct file_handle *handle;
    char type;
    char iseos;
    int (*read) ();
    void (*close) ();
};

struct str_stream {
    struct stream_buffer stream;
    Str handle;
    char type;
    char iseos;
    int (*read) ();
    void (*close) ();
};

#ifdef USE_SSL
struct ssl_stream {
    struct stream_buffer stream;
    struct ssl_handle *handle;
    char type;
    char iseos;
    int (*read) ();
    void (*close) ();
};
#endif				/* USE_SSL */

struct encoded_stream {
    struct stream_buffer stream;
    struct ens_handle *handle;
    char type;
    char iseos;
    int (*read) ();
    void (*close) ();
};

union input_stream {
    struct base_stream base;
    struct file_stream file;
    struct str_stream str;
#ifdef USE_SSL
    struct ssl_stream ssl;
#endif				/* USE_SSL */
    struct encoded_stream ens;
};

typedef struct base_stream *BaseStream;
typedef struct file_stream *FileStream;
typedef struct str_stream *StrStream;
#ifdef USE_SSL
typedef struct ssl_stream *SSLStream;
#endif				/* USE_SSL */
typedef struct encoded_stream *EncodedStrStream;

typedef union input_stream *InputStream;

extern InputStream newInputStream(int des);
extern InputStream newFileStream(FILE * f, void (*closep) ());
extern InputStream newStrStream(Str s);
#ifdef USE_SSL
extern InputStream newSSLStream(SSL * ssl, int sock);
#endif
extern InputStream newEncodedStream(InputStream is, char encoding);
extern void ISclose(InputStream stream);
extern int ISgetc(InputStream stream);
extern int ISundogetc(InputStream stream);
extern Str StrISgets(InputStream stream);
extern Str StrmyISgets(InputStream stream);
extern int ISread(InputStream stream, Str buf, int count);
extern int ISfileno(InputStream stream);
extern int ISeos(InputStream stream);
#ifdef USE_SSL
extern Str ssl_get_certificate(InputStream stream);
#endif

#define IST_BASIC	0
#define IST_FILE	1
#define IST_STR		2
#define IST_SSL		3
#define IST_ENCODED	4

#define IStype(stream) ((stream)->base.type)
#define is_eos(stream) ISeos(stream)
#define iseos(stream) ((stream)->base.iseos)
#define file_of(stream) ((stream)->file.handle->f)
#define set_close(stream,closep) ((IStype(stream)==IST_FILE)?((stream)->file.handle->close=(closep)):0)
#define str_of(stream) ((stream)->str.handle)
#ifdef USE_SSL
#define ssl_socket_of(stream) ((stream)->ssl.handle->sock)
#define ssl_of(stream) ((stream)->ssl.handle->ssl)
#endif

#ifdef USE_BINMODE_STREAM
#define openIS(path) newInputStream(open((path),O_RDONLY|O_BINARY))
#else
#define openIS(path) newInputStream(open((path),O_RDONLY))
#endif				/* USE_BINMODE_STREAM */
#endif