/*
 * Copyright (c) 2004-2005 Sergey Lyubka <valenok@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * $Id$
 */

#ifndef SHTTPD_HEADER_INCLUDED
#define	SHTTPD_HEADER_INCLUDED

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/*
 * This structure is passed to the user callback function
 */
struct shttpd_arg {
	void		*priv;		/* Private! Do not touch!	*/
	void		*state;		/* User state			*/
	void		*user_data;	/* User-defined data		*/

	struct {
		char	*buf;		/* Buffer pointer		*/
		int	len;		/* Size of a buffer		*/
		int	num_bytes;	/* Bytes processed by callback	*/
	} in, out;	/* POST data buffer (in) and output buffer (out) */

	unsigned int	flags;
#define	SHTTPD_END_OF_OUTPUT	1
#define	SHTTPD_CONNECTION_ERROR	2
#define	SHTTPD_MORE_POST_DATA	4
#define	SHTTPD_POST_BUFFER_FULL	8
};

/*
 * User callback function. Called when certain registered URLs have been
 * requested. These are the requirements to the callback function:
 *
 * 1. it must copy data into 'out_buf', not more than 'out_buf_max_len' bytes,
 *	and record how many bytes are copied, into 'out_buf_written_len'
 * 2. it must not block the execution
 * 3. it must set 'last' in shttpd_arg to 1 if there is no more data
 * 4. for POST requests, it must process the incoming data (in_buf), and
 *	set 'in_buf_read_len', which is how many bytes of POST data is read
 *	and can be discarded by SHTTPD.
 */
typedef void (*shttpd_callback_t)(struct shttpd_arg *);

/*
 * shttpd_init		Initialize shttpd context. Parameters: configuration
 *			file name (may be NULL), then NULL-terminated
 *			sequence of pairs "option_name", "option_value".
 * shttpd_init2		Same as shttpd_init, but the list of option/value
 *			pairs is passed in arrays
 * shttpd_fini		Dealocate the context
 * shttpd_register_uri	Setup the callback function for specified URL.
 * shttpd_protect_uri	Associate authorization file with an URL.
 * shttpd_add_mime_type	Add mime type
 * shtppd_listen	Setup a listening socket in the SHTTPD context
 * shttpd_poll		Do connections processing
 * shttpd_version	return string with SHTTPD version
 * shttpd_get_var	Return POST/GET variable value for given variable name.
 * shttpd_get_header	return value of the specified HTTP header
 * shttpd_get_env	return string values for the following
 *			pseudo-variables: "REQUEST_METHOD", "REQUEST_URI",
 *			"REMOTE_USER" and "REMOTE_ADDR".
 */

struct shttpd_ctx;

struct shttpd_ctx *shttpd_init(const char *config_file, ...);
struct shttpd_ctx *shttpd_init2(const char *config_file,
		char *names[], char *values[], size_t num_options);
void shttpd_fini(struct shttpd_ctx *);
void shttpd_add_mime_type(struct shttpd_ctx *,
		const char *ext, const char *mime);
int shttpd_listen(struct shttpd_ctx *ctx, int port);
void shttpd_register_uri(struct shttpd_ctx *ctx,
		const char *uri, shttpd_callback_t callback, void *user_data);
void shttpd_protect_uri(struct shttpd_ctx *ctx,
		const char *uri, const char *file);
void shttpd_poll(struct shttpd_ctx *, int milliseconds);
const char *shttpd_version(void);
int shttpd_get_var(const char *var, const char *buf, int buf_len,
		char *value, int value_len);
const char *shttpd_get_header(struct shttpd_arg *, const char *);
const char *shttpd_get_env(struct shttpd_arg *, const char *);
void shttpd_get_http_version(struct shttpd_arg *,
		unsigned long *major, unsigned long *minor);
size_t shttpd_printf(struct shttpd_arg *, const char *fmt, ...);
void shttpd_handle_error(struct shttpd_ctx *ctx, int status,
		shttpd_callback_t func, void *data);

/*
 * The following three functions are for applications that need to
 * load-balance the connections on their own. Many threads may be spawned
 * with one SHTTPD context per thread. Boss thread may only wait for
 * new connections by means of shttpd_accept(). Then it may scan thread
 * pool for the idle thread by means of shttpd_active(), and add new
 * connection to the context by means of shttpd_add().
 */
void shttpd_add_socket(struct shttpd_ctx *, int sock);
int shttpd_accept(int lsn_sock, int milliseconds);
int shttpd_active(struct shttpd_ctx *);


#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* SHTTPD_HEADER_INCLUDED */