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/*****************************************************************************
fileType.cpp
(c) 2009 - Aaron Quinlan
Hall Laboratory
Department of Biochemistry and Molecular Genetics
University of Virginia
aaronquinlan@gmail.com
Licensed under the MIT license (as of Jan 2022)
******************************************************************************/
#include "fileType.h"
/*
returns TRUE if the file is a regular file:
not a pipe/device.
This implies that the file can be opened/closed/seek'd multiple times without losing information
*/
bool isRegularFile(const string& filename) {
struct stat buf ;
int i;
i = stat(filename.c_str(), &buf);
if (i!=0) {
cerr << "BEDTools Error: can't determine file type of '" << filename << "': " << strerror(errno) << endl;
return false;
}
if (S_ISREG(buf.st_mode))
return true;
return false;
}
/*
returns TRUE if the file has a GZIP header.
Should only be run on regular files.
*/
bool isGzipFile(const string& filename) {
//see http://www.gzip.org/zlib/rfc-gzip.html#file-format
struct {
unsigned char id1;
unsigned char id2;
unsigned char cm;
} gzip_header;
ifstream f(filename.c_str(), ios::in|ios::binary);
if (!f)
return false;
if (!f.read((char*)&gzip_header, sizeof(gzip_header)))
return false;
if ( gzip_header.id1 == 0x1f
&&
gzip_header.id2 == 0x8b
&&
gzip_header.cm == 8 )
return true;
return false;
}
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