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/*
cmap_open.c: Opening CCP4-format map files.
Copyright (C) 2001 CCLRC, Charles Ballard
This library is free software: you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
version 3, modified in accordance with the provisions of the
license to address the requirements of UK law.
You should have received a copy of the modified GNU Lesser General
Public License along with this library. If not, copies may be
downloaded from http://www.ccp4.ac.uk/ccp4license.php
This program 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 Lesser General Public License for more details.
*/
/** @file cmap_open.c
*
* @brief Opening CCP4-format map files.
*
* @author Charles Ballard
*/
#include <string.h>
#include <math.h>
#include <stdarg.h>
#include <fcntl.h>
#include "cmaplib.h"
#include "cmap_header.h"
#include "cmap_labels.h"
#include "cmap_errno.h"
/*! Internal: malloc CMMFile struct for reading into
\return CMMFile */
CMMFile *init_cmap_read(void)
{
CMMFile *mfile = (CMMFile *) malloc(sizeof(CMMFile));
if (mfile)
memset(mfile,'\0',sizeof(CMMFile));
return mfile;
}
/*! Internal: malloc CMMFile struct for writing
\return CMMFile */
CMMFile *init_cmap_write(void)
{
CMMFile *mfile = (CMMFile *) malloc(sizeof(CMMFile));
if (mfile) {
memset(mfile,'\0',sizeof(CMMFile));
mfile->data_mode = DEFMODE;
mfile->symop.offset = 1024U;
mfile->data.offset = 1024U; }
return mfile;
}
/*! Internal: Identify file as a ccp4 format map
\param file The (CCP4File *) struct representing the file.
\return non-zero on true, 0 on false */
int is_cmap(CCP4File *file)
{
char buffer[4];
const unsigned int map_offset = 208U;
if (file == NULL)
return 0;
if ( ccp4_file_raw_seek(file,map_offset,SEEK_SET) == EOF)
return 0;
if (ccp4_file_readchar(file,(uint8 *) buffer,4U) != 4U)
return 0;
ccp4_file_rewind(file);
return !strncmp(buffer,"MAP ",4);
}
/*! The file is opened.
\param filename (char *) the filename
\param mode (int) the i/o mode , possible values are O_RDONLY, O_WRONLY,
O_RDWR, O_APPEND, O_TMP, O_CREAT, O_TRUNC - see ccp4_sysdep.h
\return (void *) CMMFile structure */
void *ccp4_cmap_open(const char *filename, int mode)
{
CMMFile *mfile;
CCP4File *cfile;
const size_t stamp_offset = 212U;
if ((cfile = ccp4_file_open(filename, mode)) == NULL) {
ccp4_signal( CCP4_ERRLEVEL(3) | CMAP_ERRNO(CMERR_CantOpenFile),
"ccp4_cmap_open",NULL);
return (NULL); }
ccp4_file_raw_setstamp(cfile, stamp_offset);
/* read or write only */
if (cfile->read) {
if (!is_cmap(cfile) || cfile->length < 1025) {
ccp4_signal( CCP4_ERRLEVEL(3) | CMAP_ERRNO(CMERR_NoHeader),
"ccp4_cmap_open",NULL);
ccp4_file_close(cfile);
return NULL; }
ccp4_file_rarch(cfile);
mfile = init_cmap_read();
mfile->stream = cfile;
mfile->file_name = cfile->name;
parse_mapheader(mfile);
parse_maplabels(mfile);
} else if (cfile->write) {
mfile = init_cmap_write();
mfile->stream = cfile;
mfile->file_name = cfile->name;
write_mapheader(mfile);
write_maplabels(mfile);
} else {
ccp4_signal( CCP4_ERRLEVEL(3) | CMAP_ERRNO(CMERR_CantOpenFile),
"ccp4_cmap_open",NULL);
return (NULL); }
return (mfile);
}
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