/******************************************************************
 *  $Id: nanohttp-stream.h,v 1.12 2006/11/23 15:27:33 m0gg Exp $
 *
 * CSOAP Project:  A http client/server library in C
 * Copyright (C) 2003-2004  Ferhat Ayaz
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA  02111-1307, USA.
 * 
 * Email: ferhatayaz@yahoo.com
 ******************************************************************/
#ifndef __nanohttp_stream_h
#define __nanohttp_stream_h

/**
 *
 * HTTP Stream modul:
 *
 * nanohttp supports 2 different streams:
 *
 * 1. http_input_stream_t
 * 2. http_output_stream_t
 *
 * These are not regular streams. They will care about transfer styles while
 * sending/receiving data.
 *
 * Supported transfer styles are
 *
 * - Content-length
 * - Chunked encoding
 * - Connection: "close"
 *
 * A stream will set its transfer style from the header information, which must
 * be given while creating a stream.
 *
 * A stream will start sending/receiving data "after" sending/receiving header
 * information. (After <CF><CF>)"
 *
 */

/**
 *
 * Transfer types supported while 
 * sending/receiving data.
 *
 */
typedef enum http_transfer_type
{
  /** The stream cares about Content-length */
  HTTP_TRANSFER_CONTENT_LENGTH,

  /** The stream sends/receives chunked data */
  HTTP_TRANSFER_CHUNKED,

  /** The stream sends/receives data until connection is closed */
  HTTP_TRANSFER_CONNECTION_CLOSE,

  /** This transfer style will be used by MIME support and for debug purposes.*/
  HTTP_TRANSFER_FILE
} http_transfer_type_t;


/**
 *
 * HTTP INPUT STREAM. Receives data from a socket/file
 * and cares about the transfer style.
 *
 */
struct http_input_stream_t
{
  struct hsocket_t *sock;
  herror_t err;
  http_transfer_type_t type;
  int received;
  int content_length;
  int chunk_size;
  char connection_closed;

  /* file handling */
  FILE *fd;
  char filename[255];
  int deleteOnExit;             /* default is 0 */
};

/**
 *
 * HTTP OUTPUT STREAM. Sends data to a socket
 * and cares about the transfer style.
 *
 */
struct http_output_stream_t
{
  struct hsocket_t *sock;
  http_transfer_type_t type;
  int content_length;
  int sent;
};


#ifdef __cplusplus
extern "C" {
#endif

/**
 *
 * Creates a new input stream. The transfer style will be 
 * choosen from the given header.
 *
 * @param sock the socket to receive data from
 * @param header the http header. This must be received before
 *        creating a http_input_stream_t.
 *
 * @returns a newly created http_input_stream_t object. If no transfer style was
 *          found in the header, HTTP_TRANSFER_CONNECTION_CLOSE  will be used as
 *          default.
 *
 * @see http_input_stream_free
 *
 */
extern struct http_input_stream_t *http_input_stream_new(struct hsocket_t *sock, hpair_t *header);

/**
 *
 * Creates a new input stream from file. This function was added for MIME
 * messages and for debugging. The transfer style is always HTTP_TRANSFER_FILE.
 *
 * @param filename the name of the file to open and read. 
 *
 * @returns The return value is a http_input_stream_t object if the file exists
 *          and could be opened. NULL otherwise.
 *
 * @see http_input_stream_free
 *
 */
extern struct http_input_stream_t *http_input_stream_new_from_file(const char *filename);

/**
 *
 * Free input stream. Note that the socket will not be closed by this functions.
 *
 * @param stream the input stream to free.
 *
 */
extern void http_input_stream_free(struct http_input_stream_t * stream);

/**
 *
 * Returns the actual status of the stream.
 *
 * @param stream the stream to check its status
 *
 * @returns <br>1 if there are still data to read. 
 *          <br>0 if no more data exists.
 */
extern int http_input_stream_is_ready(struct http_input_stream_t * stream);

/**
 *
 * Tries to read 'size' bytes from the stream. Check always with
 * http_input_stream_is_ready() if there are some data to read. If it returns 0,
 * no more data is available on stream.
 *
 * On error this function will return -1. In this case the "err" field of stream
 * will be set to the actual error. This can be one of the followings:
 * 
 * - STREAM_ERROR_NO_CHUNK_SIZE 
 * - STREAM_ERROR_WRONG_CHUNK_SIZE
 * - STREAM_ERROR_INVALID_TYPE
 * - HSOCKET_ERROR_RECEIVE  
 *
 * @param stream the stream to read data from
 * @param dest destination memory to store readed bytes
 * @param size maximum size of 'dest' (size to read)
 *
 * @returns the actual readed bytes or -1 on error.
 *
 */
extern int http_input_stream_read(struct http_input_stream_t * stream, unsigned char *dest, int size);

/**
 *
 * Creates a new output stream. Transfer style will be found from the given
 * header.
 *
 * @param sock the socket to to send data to
 * @param header the header which must be sent before
 *
 * @returns a http_output_stream_t object. If no proper transfer style was found
 *          in the header, HTTP_TRANSFER_CONNECTION_CLOSE will be used as default.
 *
 * @see http_output_stream_free
 *
 */
extern struct http_output_stream_t *http_output_stream_new(struct hsocket_t *sock, hpair_t * header);


/**
 *
 * Free output stream. Note that this functions will not close any socket
 * connections.
 *
 * @param stream the stream to free.
 *
 */
extern void http_output_stream_free(struct http_output_stream_t * stream);

/**
 *
 * Writes 'size' bytes of 'bytes' into stream.
 *
 * @param stream the stream to use to send data
 * @param bytes bytes to send
 * @param size size of bytes to send
 *
 * @returns H_OK if success. One of the followings otherwise
 *
 *  - HSOCKET_ERROR_NOT_INITIALIZED
 *  - HSOCKET_ERROR_SEND
 *
 */
extern herror_t http_output_stream_write(struct http_output_stream_t *stream, const unsigned char* bytes, int size);

/**
 *
 * Writes a null terminated string to the stream.
 *
 * @param stream the stream to use to send data
 * @param str a null terminated string to send
 *
 * @returns H_OK if success. One of the followings otherwise
 *
 *  - HSOCKET_ERROR_NOT_INITIALIZED
 *  - HSOCKET_ERROR_SEND
 *
 */
extern herror_t http_output_stream_write_string(struct http_output_stream_t *stream, const char *str);

/**
 *
 * Sends finish flags if nesseccary (like in chunked transport).
 * Call always this function before closing the connections.
 *
 * @param stream the stream to send post data.
 *
 * @returns H_OK if success. One of the followings otherwise
 *
 *   - HSOCKET_ERROR_NOT_INITIALIZED
 *   - HSOCKET_ERROR_SEND
 *
 */
extern herror_t http_output_stream_flush(struct http_output_stream_t *stream);

#ifdef __cplusplus
}
#endif

#endif