~drizzle-trunk/drizzle/development

/*

 * Drizzle Client & Protocol Library

 *

 * Copyright (C) 2008 Eric Day (eday@oddments.org)

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are

 * met:

 *

 *     * Redistributions of source code must retain the above copyright

 * notice, this list of conditions and the following disclaimer.

 *

 *     * Redistributions in binary form must reproduce the above

 * copyright notice, this list of conditions and the following disclaimer

 * in the documentation and/or other materials provided with the

 * distribution.

 *

 *     * The names of its contributors may not be used to endorse or

 * promote products derived from this software without specific prior

 * written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 */

/**

 * @file

 * @brief Row definitions

 */

#include <libdrizzle-1.0/common.h>

/*

 * Client definitions

 */

uint64_t drizzle_row_read(drizzle_result_st *result, drizzle_return_t *ret_ptr)

{

  if ((result->column_current != result->column_count) && (!(result->options & DRIZZLE_RESULT_BUFFER_COLUMN)))

  {

    drizzle_set_error(result->con->drizzle, "drizzle_row_read", "cannot retrieve rows until all columns are retrieved");

    *ret_ptr= DRIZZLE_RETURN_NOT_READY;

    return 0;

  }

  if (drizzle_state_none(result->con))

  {

    drizzle_state_push(result->con, drizzle_state_row_read);

    drizzle_state_push(result->con, drizzle_state_packet_read);

  }

  *ret_ptr= drizzle_state_loop(result->con);

  return result->row_current;

}

drizzle_row_t drizzle_row_buffer(drizzle_result_st *result,

                                 drizzle_return_t *ret_ptr)

{

  size_t total;

  drizzle_field_t field;

  drizzle_row_t row;

  if (result->row == NULL)

  {

    if (drizzle_row_read(result, ret_ptr) == 0 || *ret_ptr != DRIZZLE_RETURN_OK)

      return NULL;

    result->row= malloc((sizeof(drizzle_field_t) + sizeof(size_t)) *

                        result->column_count);

    if (result->row == NULL)

    {

      drizzle_set_error(result->con->drizzle, "drizzle_row_buffer", "malloc");

      *ret_ptr= DRIZZLE_RETURN_MEMORY;

      return NULL;

    }

    result->field_sizes= (size_t *)(result->row + result->column_count);

  }

  while (1)

  {

    field= drizzle_field_buffer(result, &total, ret_ptr);

    if (*ret_ptr == DRIZZLE_RETURN_ROW_END)

      break;

    if (*ret_ptr != DRIZZLE_RETURN_OK)

    {

      if (*ret_ptr != DRIZZLE_RETURN_IO_WAIT)

      {

        free(result->row);

        result->row= NULL;

        result->field_sizes= NULL;

      }

      return NULL;

    }

    result->row[result->field_current - 1]= field;

    result->field_sizes[result->field_current - 1]= total;

  }

  *ret_ptr= DRIZZLE_RETURN_OK;

  row= result->row;

  result->row= NULL;

  return row;

}

void drizzle_row_free(drizzle_result_st *result, drizzle_row_t row)

{

  uint16_t x;

  for (x= 0; x < result->column_count; x++)

      drizzle_field_free(row[x]);

  free(row);

}

size_t *drizzle_row_field_sizes(drizzle_result_st *result)

{

  return result->field_sizes;

}

drizzle_row_t drizzle_row_next(drizzle_result_st *result)

{

  if (result->row_current == result->row_count)

    return NULL;

  result->field_sizes= result->field_sizes_list[result->row_current];

  result->row_current++;

  return result->row_list[result->row_current - 1];

}

drizzle_row_t drizzle_row_prev(drizzle_result_st *result)

{

  if (result->row_current == 0)

    return NULL;

  result->row_current--;

  result->field_sizes= result->field_sizes_list[result->row_current];

  return result->row_list[result->row_current];

}

void drizzle_row_seek(drizzle_result_st *result, uint64_t row)

{

  if (row <= result->row_count)

    result->row_current= row;

}

drizzle_row_t drizzle_row_index(drizzle_result_st *result, uint64_t row)

{

  if (row >= result->row_count)

    return NULL;

  return result->row_list[row];

}

uint64_t drizzle_row_current(drizzle_result_st *result)

{

  return result->row_current;

}

/*

 * Server definitions

 */

drizzle_return_t drizzle_row_write(drizzle_result_st *result)

{

  if (drizzle_state_none(result->con))

    drizzle_state_push(result->con, drizzle_state_row_write);

  return drizzle_state_loop(result->con);

}

/*

 * Internal state functions.

 */

drizzle_return_t drizzle_state_row_read(drizzle_con_st *con)

{

  drizzle_log_debug(con->drizzle, "drizzle_state_row_read");

  if (con->packet_size != 0 && con->buffer_size < con->packet_size && 

    con->buffer_size < 5)

  {

    drizzle_state_push(con, drizzle_state_read);

    return DRIZZLE_RETURN_OK;

  }

  if (con->packet_size == 5 && con->buffer_ptr[0] == 254)

  {

    /* Got EOF packet, no more rows. */

    con->result->row_current= 0;

    con->result->warning_count= drizzle_get_byte2(con->buffer_ptr + 1);

    con->status= drizzle_get_byte2(con->buffer_ptr + 3);

    con->buffer_ptr+= 5;

    con->buffer_size-= 5;

  }

  else if (con->buffer_ptr[0] == 255)

  {

    drizzle_state_pop(con);

    drizzle_state_push(con, drizzle_state_result_read);

    return DRIZZLE_RETURN_OK;

  }

  else if (con->result->options & DRIZZLE_RESULT_ROW_BREAK)

    con->result->options&= (drizzle_result_options_t)~DRIZZLE_RESULT_ROW_BREAK;

  else

  {

    con->result->row_count++;

    con->result->row_current++;

    con->result->field_current= 0;

  }

  drizzle_state_pop(con);

  return DRIZZLE_RETURN_OK;

}

drizzle_return_t drizzle_state_row_write(drizzle_con_st *con)

{

  uint8_t *start= con->buffer_ptr + con->buffer_size;

  drizzle_log_debug(con->drizzle, "drizzle_state_row_write");

  /* Flush buffer if there is not enough room. */

  if (((size_t)DRIZZLE_MAX_BUFFER_SIZE - (size_t)(start - con->buffer)) < 4)

  {

    drizzle_state_push(con, drizzle_state_write);

    return DRIZZLE_RETURN_OK;

  }

  drizzle_set_byte3(start, con->packet_size);

  start[3]= con->packet_number;

  con->packet_number++;

  con->buffer_size+= 4;

  drizzle_state_pop(con);

  return DRIZZLE_RETURN_OK;

}