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check_edf_file.cpp
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/*
***************************************************************************
*
* Author: Teunis van Beelen
*
* Copyright (C) 2007 - 2022 Teunis van Beelen
*
* Email: teuniz@protonmail.com
*
***************************************************************************
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3 of the License.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
***************************************************************************
*/
#include "check_edf_file.h"
struct edfhdrblock * EDFfileCheck::check_edf_file(FILE *inputfile, char *txt_string, int txt_len, int live_stream, int import_annots_active)
{
int i, j, p, r=0, n,
dotposition,
error;
char *edf_hdr,
scratchpad[128],
scratchpad2[64];
long long l_tmp,
l_tmp2;
struct date_time_struct date_time;
/***************** check header ******************************/
edf_hdr = (char *)calloc(1, 256);
if(edf_hdr==NULL)
{
snprintf(txt_string, txt_len, "Memory allocation error. (edf_hdr)");
return NULL;
}
edfhdr = (struct edfhdrblock *)calloc(1, sizeof(struct edfhdrblock));
if(edfhdr==NULL)
{
snprintf(txt_string, txt_len, "Memory allocation error. (edfhdr)");
free(edf_hdr);
return NULL;
}
rewind(inputfile);
if(fread(edf_hdr, 256, 1, inputfile)!=1)
{
snprintf(txt_string, txt_len, "Error, reading file");
free(edf_hdr);
free(edfhdr);
return NULL;
}
/**************************** VERSION ***************************************/
strncpy(scratchpad, edf_hdr, 8);
scratchpad[8] = 0;
if(((signed char *)scratchpad)[0]==-1) // BDF-file
{
for(i=1; i<8; i++)
{
if((scratchpad[i]<32)||(scratchpad[i]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of version field is not a valid 7-bit ASCII character.",
i + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
if(strcmp(scratchpad + 1, "BIOSEMI"))
{
snprintf(txt_string, txt_len, "Error, header has unknown version: \".%s\",\n"
"expected \".BIOSEMI\"",
scratchpad + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
edfhdr->bdf = 1;
}
else // EDF-file
{
for(i=0; i<8; i++)
{
if((scratchpad[i]<32)||(scratchpad[i]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of version field is not a valid 7-bit ASCII character.",
i + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
if(strcmp(scratchpad, "0 "))
{
snprintf(txt_string, txt_len, "Error, header has unknown version: \"%s\",\n"
"expected \"0 \"",
scratchpad);
free(edf_hdr);
free(edfhdr);
return NULL;
}
edfhdr->edf = 1;
}
strncpy(edfhdr->version, edf_hdr, 8);
edfhdr->version[8] = 0;
if(edfhdr->bdf) edfhdr->version[0] = '.';
/********************* PATIENTNAME *********************************************/
strncpy(scratchpad, edf_hdr + 8, 80);
scratchpad[80] = 0;
for(i=0; i<80; i++)
{
if((((unsigned char *)scratchpad)[i]<32)||(((unsigned char *)scratchpad)[i]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of local patient identification field is not a valid 7-bit ASCII character.\n"
"Use the header editor to repair your file. Look at the manual for the details.",
i + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
strncpy(edfhdr->patient, edf_hdr + 8, 80);
edfhdr->patient[80] = 0;
/********************* RECORDING *********************************************/
strncpy(scratchpad, edf_hdr + 88, 80);
scratchpad[80] = 0;
for(i=0; i<80; i++)
{
if((((unsigned char *)scratchpad)[i]<32)||(((unsigned char *)scratchpad)[i]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of local recording identification field is not a valid 7-bit ASCII character.\n"
"Use the header editor to repair your file. Look at the manual for the details.",
i + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
strncpy(edfhdr->recording, edf_hdr + 88, 80);
edfhdr->recording[80] = 0;
/********************* STARTDATE *********************************************/
strncpy(scratchpad, edf_hdr + 168, 8);
scratchpad[8] = 0;
for(i=0; i<8; i++)
{
if((scratchpad[i]<32)||(scratchpad[i]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of startdate field is not a valid 7-bit ASCII character.",
i + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
error = 0;
if((edf_hdr[170]!='.')||(edf_hdr[173]!='.'))
{
snprintf(txt_string, txt_len, "Error, separator character of startdate is not a dot.\n"
"You can repair the file with the header editor, check the manual for details.");
free(edf_hdr);
free(edfhdr);
return NULL;
}
if((edf_hdr[168]<48)||(edf_hdr[168]>57)) error = 1;
if((edf_hdr[169]<48)||(edf_hdr[169]>57)) error = 1;
if((edf_hdr[171]<48)||(edf_hdr[171]>57)) error = 1;
if((edf_hdr[172]<48)||(edf_hdr[172]>57)) error = 1;
if((edf_hdr[174]<48)||(edf_hdr[174]>57)) error = 1;
if((edf_hdr[175]<48)||(edf_hdr[175]>57)) error = 1;
strncpy(scratchpad, edf_hdr + 168, 8);
if(error)
{
scratchpad[8] = 0;
snprintf(txt_string, txt_len, "Error, startdate of recording is invalid: \"%s\",\n"
"expected \"dd.mm.yy\"",
scratchpad);
free(edf_hdr);
return NULL;
}
scratchpad[2] = 0;
scratchpad[5] = 0;
scratchpad[8] = 0;
if((atoi(scratchpad)<1)||(atoi(scratchpad)>31))
{
strncpy(scratchpad, edf_hdr + 168, 8);
scratchpad[8] = 0;
snprintf(txt_string, txt_len, "Error, startdate of recording is invalid: \"%s\",\n"
"expected \"dd.mm.yy\" where \"dd\" should be more than 00 and less than 32",
scratchpad);
free(edf_hdr);
return NULL;
}
if((atoi(scratchpad+3)<1)||(atoi(scratchpad+3)>12))
{
strncpy(scratchpad, edf_hdr + 168, 8);
scratchpad[8] = 0;
snprintf(txt_string, txt_len, "Error, startdate of recording is invalid: \"%s\",\n"
"expected \"dd.mm.yy\" where \"mm\" should be more than 00 and less than 13",
scratchpad);
free(edf_hdr);
free(edfhdr);
return NULL;
}
date_time.day = atoi(scratchpad);
date_time.month = atoi(scratchpad + 3);
date_time.year = atoi(scratchpad + 6);
if(date_time.year>84)
{
date_time.year += 1900;
}
else
{
date_time.year += 2000;
}
/********************* STARTTIME *********************************************/
strncpy(scratchpad, edf_hdr + 176, 8);
scratchpad[8] = 0;
for(i=0; i<8; i++)
{
if((scratchpad[i]<32)||(scratchpad[i]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of starttime field is not a valid 7-bit ASCII character.",
i + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
error = 0;
if((edf_hdr[178]!='.')||(edf_hdr[181]!='.'))
{
snprintf(txt_string, txt_len, "Error, separator character of starttime is not a dot.\n"
"You can repair the file with the header editor, check the manual for details.");
free(edf_hdr);
free(edfhdr);
return NULL;
}
if((edf_hdr[176]<48)||(edf_hdr[176]>57)) error = 1;
if((edf_hdr[177]<48)||(edf_hdr[177]>57)) error = 1;
if((edf_hdr[179]<48)||(edf_hdr[179]>57)) error = 1;
if((edf_hdr[180]<48)||(edf_hdr[180]>57)) error = 1;
if((edf_hdr[182]<48)||(edf_hdr[182]>57)) error = 1;
if((edf_hdr[183]<48)||(edf_hdr[183]>57)) error = 1;
strncpy(scratchpad, edf_hdr + 176, 8);
if(error)
{
strncpy(scratchpad, edf_hdr + 176, 8);
scratchpad[8] = 0;
snprintf(txt_string, txt_len, "Error, starttime of recording is invalid: \"%s\",\n"
"expected \"hh.mm.ss\"",
scratchpad);
free(edf_hdr);
free(edfhdr);
return NULL;
}
scratchpad[2] = 0;
scratchpad[5] = 0;
scratchpad[8] = 0;
if(atoi(scratchpad)>23)
{
strncpy(scratchpad, edf_hdr + 176, 8);
scratchpad[8] = 0;
snprintf(txt_string, txt_len, "Error, starttime of recording is invalid: \"%s\",\n"
"expected \"hh.mm.ss\" where \"hh\" should be less than 24",
scratchpad);
free(edf_hdr);
free(edfhdr);
return NULL;
}
if(atoi(scratchpad+3)>59)
{
strncpy(scratchpad, edf_hdr + 176, 8);
scratchpad[8] = 0;
snprintf(txt_string, txt_len, "Error, starttime of recording is invalid: \"%s\",\n"
"expected \"hh.mm.ss\" where \"mm\" should be less than 60",
scratchpad);
free(edf_hdr);
free(edfhdr);
return NULL;
}
if(atoi(scratchpad+6)>59)
{
strncpy(scratchpad, edf_hdr + 176, 8);
scratchpad[8] = 0;
snprintf(txt_string, txt_len, "Error, starttime of recording is invalid: \"%s\",\n"
"expected \"hh.mm.ss\" where \"ss\" should be less than 60",
scratchpad);
free(edf_hdr);
free(edfhdr);
return NULL;
}
date_time.hour = atoi(scratchpad);
date_time.minute = atoi(scratchpad + 3);
date_time.second = atoi(scratchpad + 6);
date_time_to_utc(&edfhdr->utc_starttime, date_time);
edfhdr->l_starttime = 3600 * atoi(scratchpad);
edfhdr->l_starttime += 60 * atoi(scratchpad + 3);
edfhdr->l_starttime += atoi(scratchpad + 6);
edfhdr->l_starttime *= TIME_DIMENSION;
/***************** NUMBER OF SIGNALS IN HEADER *******************************/
strncpy(scratchpad, edf_hdr + 252, 4);
scratchpad[4] = 0;
for(i=0; i<4; i++)
{
if((scratchpad[i]<32)||(scratchpad[i]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of number of signals field is not a valid 7-bit ASCII character.",
i + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
if(is_integer_number(scratchpad))
{
snprintf(txt_string, txt_len, "Error, number of signals field is invalid: \"%s\".",
scratchpad);
free(edf_hdr);
free(edfhdr);
return NULL;
}
edfhdr->edfsignals = atoi(scratchpad);
if(edfhdr->edfsignals<1)
{
snprintf(txt_string, txt_len, "Error, number of signals is %i, expected >0.",
edfhdr->edfsignals);
free(edf_hdr);
free(edfhdr);
return NULL;
}
if(edfhdr->edfsignals>MAXSIGNALS)
{
snprintf(txt_string, txt_len, "Error, number of signals in file is %i, cannot support more than %i signals.",
edfhdr->edfsignals,
MAXSIGNALS);
free(edf_hdr);
free(edfhdr);
return NULL;
}
/***************** NUMBER OF BYTES IN HEADER *******************************/
strncpy(scratchpad, edf_hdr + 184, 8);
scratchpad[8] = 0;
for(i=0; i<8; i++)
{
if((scratchpad[i]<32)||(scratchpad[i]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of number of bytes in header field is not a valid 7-bit ASCII character.",
i + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
if(is_integer_number(scratchpad))
{
snprintf(txt_string, txt_len, "Error, number of bytes in header field is invalid: \"%s\".",
scratchpad);
free(edf_hdr);
free(edfhdr);
return NULL;
}
n = atoi(scratchpad);
if((edfhdr->edfsignals * 256 + 256)!=n)
{
snprintf(txt_string, txt_len, "Error, number of bytes in header does not match: %i,\n"
"expected %i signals * 256 + 256 = %i bytes.",
n, edfhdr->edfsignals, edfhdr->edfsignals * 256 + 256);
free(edf_hdr);
free(edfhdr);
return NULL;
}
/********************* RESERVED FIELD *************************************/
edfhdr->edfplus = 0;
edfhdr->discontinuous = 0;
strncpy(scratchpad, edf_hdr + 192, 44);
scratchpad[44] = 0;
for(i=0; i<44; i++)
{
if((scratchpad[i]<32)||(scratchpad[i]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of reserved field is not a valid 7-bit ASCII character.",
i + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
if(edfhdr->edf)
{
if(!strncmp(scratchpad, "EDF+C", 5))
{
edfhdr->edfplus = 1;
}
if(!strncmp(scratchpad, "EDF+D", 5))
{
edfhdr->edfplus = 1;
edfhdr->discontinuous = 1;
}
}
if(edfhdr->bdf)
{
if(!strncmp(scratchpad, "BDF+C", 5))
{
edfhdr->bdfplus = 1;
}
if(!strncmp(scratchpad, "BDF+D", 5))
{
edfhdr->bdfplus = 1;
edfhdr->discontinuous = 1;
}
}
strncpy(edfhdr->reserved, edf_hdr + 192, 44);
edfhdr->reserved[44] = 0;
/********************* NUMBER OF DATARECORDS *************************************/
strncpy(scratchpad, edf_hdr + 236, 8);
scratchpad[8] = 0;
for(i=0; i<8; i++)
{
if((scratchpad[i]<32)||(scratchpad[i]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of number of datarecords field is not a valid ASCII character.",
i + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
if(is_integer_number(scratchpad))
{
snprintf(txt_string, txt_len, "Error, number of datarecords field is invalid: \"%s\".\n"
"You can repair the file with the header editor, check the manual for details.",
scratchpad);
free(edf_hdr);
free(edfhdr);
return NULL;
}
edfhdr->datarecords = atoi(scratchpad);
if(live_stream == 0)
{
if(edfhdr->datarecords<1)
{
#ifdef Q_OS_WIN32
__mingw_snprintf(txt_string, txt_len, "Error, number of datarecords is %lli, expected >0.\n"
"You can repair the file with the header editor, check the manual for details.",
edfhdr->datarecords);
#else
snprintf(txt_string, txt_len, "Error, number of datarecords is %lli, expected >0.\n"
"You can repair the file with the header editor, check the manual for details.",
edfhdr->datarecords);
#endif
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
/********************* DATARECORD DURATION *************************************/
strncpy(scratchpad, edf_hdr + 244, 8);
scratchpad[8] = 0;
for(i=0; i<8; i++)
{
if((scratchpad[i]<32)||(scratchpad[i]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of recordduration field is not a valid 7-bit ASCII character.",
i + 1);
free(edf_hdr);
free(edfhdr);
return NULL;
}
}
if(is_number(scratchpad))
{
snprintf(txt_string, txt_len, "Error, record duration field is invalid: \"%s\".",
scratchpad);
free(edf_hdr);
free(edfhdr);
return NULL;
}
edfhdr->data_record_duration = atof(scratchpad);
if(dblcmp(edfhdr->data_record_duration, 0) == 0)
{
edfhdr->data_record_duration = 0;
edfhdr->long_data_record_duration = 0LL;
}
else
{
if(edfhdr->data_record_duration<-0.000001)
{
snprintf(txt_string, txt_len, "Error, datarecord duration is less than 0");
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
edfhdr->long_data_record_duration = get_long_duration(scratchpad);
}
free(edf_hdr);
/********************* START WITH THE SIGNALS IN THE HEADER *********************/
edf_hdr = (char *)calloc(1, (edfhdr->edfsignals + 1) * 256);
if(edf_hdr==NULL)
{
snprintf(txt_string, txt_len, "Memory allocation error. (edf_hdr takes %i bytes)", (edfhdr->edfsignals + 1) * 256);
free(edfhdr);
return NULL;
}
rewind(inputfile);
if(fread(edf_hdr, (edfhdr->edfsignals + 1) * 256, 1, inputfile)!=1)
{
snprintf(txt_string, txt_len, "Error, reading %i bytes from file", (edfhdr->edfsignals + 1) * 256);
free(edf_hdr);
free(edfhdr);
return NULL;
}
edfhdr->edfparam = (struct edfparamblock *)calloc(1, sizeof(struct edfparamblock[edfhdr->edfsignals]));
if(edfhdr->edfparam==NULL)
{
snprintf(txt_string, txt_len, "Memory allocation error! (edfparam)");
free(edf_hdr);
free(edfhdr);
return NULL;
}
/**************************** LABELS *************************************/
edfhdr->nr_annot_chns = 0;
for(i=0; i<edfhdr->edfsignals; i++)
{
strncpy(scratchpad, edf_hdr + 256 + (i * 16), 16);
for(j=0; j<16; j++)
{
if((scratchpad[j]<32)||(scratchpad[j]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of label field of signal %i is not a valid 7-bit ASCII character.\n"
"Use the header editor to repair your file. Look at the manual for the details.",
j + 1,
i + 1);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
if(edfhdr->edfplus)
{
if(!strncmp(scratchpad, "EDF Annotations ", 16))
{
edfhdr->annot_ch[edfhdr->nr_annot_chns] = i;
edfhdr->nr_annot_chns++;
edfhdr->edfparam[i].annotation = 1;
}
}
if(edfhdr->bdfplus)
{
if(!strncmp(scratchpad, "BDF Annotations ", 16))
{
edfhdr->annot_ch[edfhdr->nr_annot_chns] = i;
edfhdr->nr_annot_chns++;
edfhdr->edfparam[i].annotation = 1;
}
}
strncpy(edfhdr->edfparam[i].label, edf_hdr + 256 + (i * 16), 16);
edfhdr->edfparam[i].label[16] = 0;
}
if(edfhdr->edfplus&&(!edfhdr->nr_annot_chns))
{
snprintf(txt_string, txt_len, "Error, file is marked as EDF+ but it has no annotations-signal.");
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
if(edfhdr->bdfplus&&(!edfhdr->nr_annot_chns))
{
snprintf(txt_string, txt_len, "Error, file is marked as BDF+ but it has no annotations-signal.");
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
if((!import_annots_active) && (edfhdr->long_data_record_duration == 0LL))
{
if((edfhdr->edfplus)||(edfhdr->bdfplus))
{
snprintf(txt_string, txt_len, "Datarecord duration of this file is 0.\n"
"If you want to import annotations from this file,\n"
"go to Tools -> Import annotations/events and select\n"
"tab \"EDF+/BDF+\"");
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
else
{
snprintf(txt_string, txt_len, "Error, datarecord duration is invalid, should be > 0");
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
/**************************** TRANSDUCER TYPES *************************************/
for(i=0; i<edfhdr->edfsignals; i++)
{
strncpy(scratchpad, edf_hdr + 256 + (edfhdr->edfsignals * 16) + (i * 80), 80);
for(j=0; j<80; j++)
{
if((scratchpad[j]<32)||(scratchpad[j]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of transducer type field of signal %i is not a valid 7-bit ASCII character.\n"
"Use the header editor to repair your file. Look at the manual for the details.",
j + 1,
i + 1);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
strncpy(edfhdr->edfparam[i].transducer, edf_hdr + 256 + (edfhdr->edfsignals * 16) + (i * 80), 80);
edfhdr->edfparam[i].transducer[80] = 0;
if(edfhdr->edfplus)
{
if(edfhdr->edfparam[i].annotation)
{
for(j=0; j<80; j++)
{
if(edfhdr->edfparam[i].transducer[j]!=' ')
{
snprintf(txt_string, txt_len, "Error, transducer type field of EDF annotationchannel must be empty.\n"
"Use the header editor to repair your file. Look at the manual for the details.");
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
}
}
if(edfhdr->bdfplus)
{
if(edfhdr->edfparam[i].annotation)
{
for(j=0; j<80; j++)
{
if(edfhdr->edfparam[i].transducer[j]!=' ')
{
snprintf(txt_string, txt_len, "Error, transducer type field of BDF annotationchannel must be empty."
"Use the header editor to repair your file. Look at the manual for the details.");
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
}
}
}
/**************************** PHYSICAL DIMENSIONS *************************************/
for(i=0; i<edfhdr->edfsignals; i++)
{
strncpy(scratchpad, edf_hdr + 256 + (edfhdr->edfsignals * 96) + (i * 8), 8);
for(j=0; j<8; j++)
{
if((scratchpad[j]<32)||(scratchpad[j]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of physical dimension field of signal %i is not a valid 7-bit ASCII character.\n"
"Use the header editor to repair your file. Look at the manual for the details.",
j + 1,
i + 1);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
strncpy(edfhdr->edfparam[i].physdimension, edf_hdr + 256 + (edfhdr->edfsignals * 96) + (i * 8), 8);
edfhdr->edfparam[i].physdimension[8] = 0;
}
/**************************** PHYSICAL MINIMUMS *************************************/
for(i=0; i<edfhdr->edfsignals; i++)
{
strncpy(scratchpad, edf_hdr + 256 + (edfhdr->edfsignals * 104) + (i * 8), 8);
scratchpad[8] = 0;
for(j=0; j<8; j++)
{
if((scratchpad[j]<32)||(scratchpad[j]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of physical minimum field of signal %i is not a valid 7-bit ASCII character.",
j + 1,
i + 1);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
if(is_number(scratchpad))
{
snprintf(txt_string, txt_len, "Error, physical minimum field of signal %i is invalid: \"%s\".\n"
"You can try to repair the file with the header editor, check the manual for the procedure.",
i + 1,
scratchpad);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
edfhdr->edfparam[i].phys_min = atof(scratchpad);
}
/**************************** PHYSICAL MAXIMUMS *************************************/
for(i=0; i<edfhdr->edfsignals; i++)
{
strncpy(scratchpad, edf_hdr + 256 + (edfhdr->edfsignals * 112) + (i * 8), 8);
scratchpad[8] = 0;
for(j=0; j<8; j++)
{
if((scratchpad[j]<32)||(scratchpad[j]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of physical maximum field of signal %i is not a valid 7-bit ASCII character.",
j + 1,
i + 1);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
if(is_number(scratchpad))
{
snprintf(txt_string, txt_len, "Error, physical maximum field of signal %i is invalid: \"%s\".\n"
"You can try to repair the file with the header editor, check the manual for the procedure.",
i + 1,
scratchpad);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
edfhdr->edfparam[i].phys_max = atof(scratchpad);
if(edfhdr->edfparam[i].phys_max==edfhdr->edfparam[i].phys_min)
{
snprintf(txt_string, txt_len, "Error, physical maximum of signal %i is equal to physical minimum\n"
"You can try to repair the file with the header editor, check the manual for the procedure.",
i + 1);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
/**************************** DIGITAL MINIMUMS *************************************/
for(i=0; i<edfhdr->edfsignals; i++)
{
strncpy(scratchpad, edf_hdr + 256 + (edfhdr->edfsignals * 120) + (i * 8), 8);
scratchpad[8] = 0;
for(j=0; j<8; j++)
{
if((scratchpad[j]<32)||(scratchpad[j]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of digital minimum field of signal %i is not a valid 7-bit ASCII character.",
j + 1,
i + 1);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
if(is_integer_number(scratchpad))
{
snprintf(txt_string, txt_len, "Error, digital minimum field of signal %i is invalid: \"%s\".\n"
"You can repair the file with the header editor, Look at the manual for the details.",
i + 1,
scratchpad);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
n = atoi(scratchpad);
if(edfhdr->edfplus)
{
if(edfhdr->edfparam[i].annotation)
{
if(n!=-32768)
{
snprintf(txt_string, txt_len, "Error, digital minimum of signal %i is wrong: %i,"
"\ndigital minimum of an EDF Annotations signal should be -32768\n"
"You can repair the file with the header editor, Look at the manual for the details.",
i + 1,
n);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
}
if(edfhdr->bdfplus)
{
if(edfhdr->edfparam[i].annotation)
{
if(n!=-8388608)
{
snprintf(txt_string, txt_len, "Error, digital minimum of signal %i is wrong: %i,"
"\ndigital minimum of a BDF Annotations signal should be -8388608\n"
"You can repair the file with the header editor, Look at the manual for the details.",
i + 1,
n);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
}
if(edfhdr->edf)
{
if((n>32767)||(n<-32768))
{
snprintf(txt_string, txt_len, "Error, digital minimum of signal %i is out of range: %i,\nshould be in the range -32768 to 32767",
i + 1,
n);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
if(edfhdr->bdf)
{
if((n>8388607)||(n<-8388608))
{
snprintf(txt_string, txt_len, "Error, digital minimum of signal %i is out of range: %i,\nshould be in the range -8388608 to 8388607",
i + 1,
n);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
edfhdr->edfparam[i].dig_min = n;
}
/**************************** DIGITAL MAXIMUMS *************************************/
for(i=0; i<edfhdr->edfsignals; i++)
{
strncpy(scratchpad, edf_hdr + 256 + (edfhdr->edfsignals * 128) + (i * 8), 8);
scratchpad[8] = 0;
for(j=0; j<8; j++)
{
if((scratchpad[j]<32)||(scratchpad[j]>126))
{
snprintf(txt_string, txt_len, "Error, %ith character of digital maximum field of signal %i is not a valid 7-bit ASCII character.",
j + 1,
i + 1);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
}
if(is_integer_number(scratchpad))
{
snprintf(txt_string, txt_len, "Error, digital maximum field of signal %i is invalid: \"%s\".\n"
"You can repair the file with the header editor, Look at the manual for the details.",
i + 1,
scratchpad);
free(edf_hdr);
free(edfhdr->edfparam);
free(edfhdr);
return NULL;
}
n = atoi(scratchpad);
if(edfhdr->edfplus)
{
if(edfhdr->edfparam[i].annotation)
{
if(n!=32767)
{
snprintf(txt_string, txt_len, "Error, digital maximum of signal %i is wrong: %i,"
"\ndigital maximum of an EDF Annotations signal should be 32767\n"
"You can repair the file with the header editor, Look at the manual for the details.",