lookup.c

C编写的格式转换程序

/***************************************************************************
 * lookup.c:
 *
 * Generic lookup routines for Mini-SEED information.
 *
 * Written by Chad Trabant, ORFEUS/EC-Project MEREDIAN
 *
 * modified: 2006.346
 ***************************************************************************/

#include <string.h>

#include "libmseed.h"

/***************************************************************************
 * ms_samplesize():
 * 
 * Returns the sample size based on type code or 0 for unknown.
 ***************************************************************************/
uint8_t
ms_samplesize (const char sampletype)
{
  switch (sampletype)
    {
    case 'a':
      return 1;
    case 'i':
    case 'f':
      return 4;
    case 'd':
      return 8;
    default:
      return 0;
    }  /* end switch */
  
}  /* End of ms_samplesize() */


/***************************************************************************
 * ms_encodingstr():
 * 
 * Returns a string describing a data encoding format.
 ***************************************************************************/
char *
ms_encodingstr (const char encoding)
{
  switch (encoding)
    {
    case 0:
      return "ASCII text";
    case 1:
      return "16 bit integers";
    case 2:
      return "24 bit integers";
    case 3:
      return "32 bit integers";
    case 4:
      return "IEEE floating point";
    case 5:
      return "IEEE double precision float";
    case 10:
      return "STEIM 1 Compression";
    case 11:
      return "STEIM 2 Compression";
    case 12:
      return "GEOSCOPE Muxed 24 bit int";
    case 13:
      return "GEOSCOPE Muxed 16/3 bit gain/exp";
    case 14:
      return "GEOSCOPE Muxed 16/4 bit gain/exp";
    case 15:
      return "US National Network compression";
    case 16:
      return "CDSN 16 bit gain ranged";
    case 17:
      return "Graefenberg 16 bit gain ranged";
    case 18:
      return "IPG - Strasbourg 16 bit gain";
    case 19:
      return "STEIM 3 Compression";
    case 30:
      return "SRO Gain Ranged Format";
    case 31:
      return "HGLP Format";
    case 32:
      return "DWWSSN Format";
    case 33:
      return "RSTN 16 bit gain ranged";
    default:
      return "Unknown format code";
    }  /* end switch */

}  /* End of ms_encodingstr() */


/***************************************************************************
 * ms_blktdesc():
 *
 * Return a string describing a given blockette type or NULL if the
 * type is unknown.
 ***************************************************************************/
char *
ms_blktdesc (uint16_t blkttype)
{
  switch (blkttype)
    {
    case 100:
      return "Sample Rate";
    case 200:
      return "Generic Event Detection";
    case 201:
      return "Murdock Event Detection";
    case 300:
      return "Step Calibration";
    case 310:
      return "Sine Calibration";
    case 320:
      return "Pseudo-random Calibration";
    case 390:
      return "Generic Calibration";
    case 395:
      return "Calibration Abort";
    case 400:
      return "Beam";
    case 500:
      return "Timing";
    case 1000:
      return "Data Only SEED";
    case 1001:
      return "Data Extension";
    case 2000:
      return "Opaque Data";
    }  /* end switch */

  return NULL;
  
}  /* End of ms_blktdesc() */


/***************************************************************************
 * ms_blktlen():
 *
 * Returns the total length of a given blockette type in bytes or 0 if
 * type unknown.
 ***************************************************************************/
uint16_t
ms_blktlen (uint16_t blkttype, const char *blkt, flag swapflag)
{
  uint16_t blktlen = 0;
  
  switch (blkttype)
    {
    case 100:  /* Sample Rate */
      blktlen = 12;
      break;
    case 200:  /* Generic Event Detection */
      blktlen = 28;
      break;
    case 201:  /* Murdock Event Detection */
      blktlen = 36;
      break;
    case 300:  /* Step Calibration */
      blktlen = 32;
      break;
    case 310:  /* Sine Calibration */
      blktlen = 32;
      break;
    case 320:  /* Pseudo-random Calibration */
      blktlen = 28;
      break;
    case 390:  /* Generic Calibration */
      blktlen = 28;
      break;
    case 395:  /* Calibration Abort */
      blktlen = 16;
      break;
    case 400:  /* Beam */
      blktlen = 16;
      break;
    case 500:  /* Timing */
      blktlen = 8;
      break;
    case 1000: /* Data Only SEED */
      blktlen = 8;
      break;
    case 1001: /* Data Extension */
      blktlen = 8;
      break;
    case 2000: /* Opaque Data */
      /* First 2-byte field after the blockette header is the length */
      if ( blkt )
	{
	  memcpy ((void *) &blktlen, blkt+4, sizeof (int16_t));
	  if ( swapflag ) ms_gswap2 (&blktlen);
	}
      break;
    }  /* end switch */
  
  return blktlen;
  
}  /* End of ms_blktlen() */


/***************************************************************************
 * ms_errorstr():
 *
 * Return a string describing a given libmseed error code or NULL if the
 * code is unknown.
 ***************************************************************************/
char *
ms_errorstr (int errorcode)
{
  switch (errorcode)
    {
    case MS_ENDOFFILE:
      return "End of file reached";
    case MS_NOERROR:
      return "No error";
    case MS_GENERROR:
      return "Generic error";
    case MS_NOTSEED:
      return "No SEED data detected";
    case MS_WRONGLENGTH:
      return "Length of data read does not match record length";
    case MS_OUTOFRANGE:
      return "SEED record length out of range";
    case MS_UNKNOWNFORMAT:
      return "Unknown data encoding format";
    case MS_STBADCOMPFLAG:
      return "Bad Steim compression flag(s) detected";
    }				/* end switch */
  
  return NULL;

}  /* End of ms_blktdesc() */