Ancillary.cc

Go to the documentation of this file.

// Ancillary.cc
 
#include "config.h"
 
// #define DODS_DEBUG
 
#include "Ancillary.h"
#include "debug.h"
 
#ifndef WIN32
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#else
#include <fcntl.h>
#include <io.h>
#include <process.h>
// Win32 does not define this. 08/21/02 jhrg
#define F_OK 0
#endif
 
namespace libdap {

string Ancillary::find_ancillary_file(const string &pathname, const string &ext, const string &dir,
                                      const string &file) {
    string::size_type slash = pathname.rfind('/') + 1;
    string directory = pathname.substr(0, slash);
    string filename = pathname.substr(slash);
    string basename = pathname.substr(slash, pathname.rfind('.') - slash);
 
    DBG(cerr << "find ancillary file params: " << pathname << ", " << ext << ", " << dir << ", " << file << endl);
    DBG(cerr << "find ancillary file comp: " << directory << ", " << filename << ", " << basename << endl);
 
    string dot_ext = "." + ext;
 
    string name = directory + basename + dot_ext;
    if (access(name.c_str(), F_OK) == 0)
        return name;
 
    name = pathname + dot_ext;
    if (access(name.c_str(), F_OK) == 0)
        return name;
 
    name = directory + ext;
    if (access(name.c_str(), F_OK) == 0)
        return name;
 
    name = dir + basename + dot_ext;
    if (access(name.c_str(), F_OK) == 0)
        return name;
 
    name = directory + file + dot_ext;
    if (access(name.c_str(), F_OK) == 0)
        return name;
 
    name = dir + file + dot_ext;
    if (access(name.c_str(), F_OK) == 0)
        return name;
 
    name = dir + ext;
    if (access(name.c_str(), F_OK) == 0)
        return name;
 
    return "";
}
 
// Given a pathname to a datafile, take that pathname apart and look for an
// ancillary file that describes a group of datafiles of which this datafile
// is a member. Assume that groups follow a simple naming convention where
// files use either leading or trailing digits and a common basename to name
// group members. For example, 00stuff.hdf, 01stuff.hdf, 02stuff.hdf, ..., is
// a group and is has `stuff' as its basename.

string Ancillary::find_group_ancillary_file(const string &name, const string &ext) {
    // Given /usr/local/data/stuff.01.nc
    // pathname = /usr/local/data, filename = stuff.01.nc and
    // rootname = stuff.01
    string::size_type slash = name.find_last_of('/');
    string dirname = name.substr(0, slash);
    string filename = name.substr(slash + 1);
    string rootname = filename.substr(0, filename.find_last_of('.'));
 
    // Instead of using regexs, scan the filename for leading and then
    // trailing digits.
    string::iterator rootname_iter = rootname.begin();
    string::iterator rootname_end_iter = rootname.end();
    if (isdigit(*rootname_iter)) {
        while (rootname_iter != rootname_end_iter && isdigit(*++rootname_iter))
            ;
 
        // We want: new_name = dirname + "/" + <base> + ext but without
        // creating a bunch of temp objects.
        string new_name = dirname;
        new_name.append("/");
        new_name.append(rootname_iter, rootname_end_iter);
        new_name.append(ext);
        DBG(cerr << "New Name (iter): " << new_name << endl);
        if (access(new_name.c_str(), F_OK) == 0) {
            return new_name;
        }
    }
 
    string::reverse_iterator rootname_riter = rootname.rbegin();
    string::reverse_iterator rootname_end_riter = rootname.rend();
    if (isdigit(*rootname_riter)) {
        while (rootname_riter != rootname_end_riter && isdigit(*++rootname_riter))
            ;
        string new_name = dirname;
        new_name.append("/");
        // I used reverse iters to scan rootname backwards. To avoid
        // reversing the fragment between end_riter and riter, pass append
        // regular iters obtained using reverse_iterator::base(). See Meyers
        // p. 123. 1/22/2002 jhrg
        new_name.append(rootname_end_riter.base(), rootname_riter.base());
        new_name.append(ext);
        DBG(cerr << "New Name (riter): " << new_name << endl);
        if (access(new_name.c_str(), F_OK) == 0) {
            return new_name;
        }
    }
 
    // If we're here either the file does not begin with leading digits or a
    // template made by removing those digits was not found.
 
    return "";
}
 
void Ancillary::read_ancillary_das(DAS &das, const string &pathname, const string &dir, const string &file) {
    string name = find_ancillary_file(pathname, "das", dir, file);
 
    DBG(cerr << "In Ancillary::read_ancillary_dds: name:" << name << endl);
 
    FILE *in = fopen(name.c_str(), "r");
    if (in) {
        das.parse(in);
        (void)fclose(in);
    }
}
 
void Ancillary::read_ancillary_dds(DDS &dds, const string &pathname, const string &dir, const string &file) {
    string name = find_ancillary_file(pathname, "dds", dir, file);
 
    DBG(cerr << "In Ancillary::read_ancillary_dds: name:" << name << endl);
 
    FILE *in = fopen(name.c_str(), "r");
    if (in) {
        dds.parse(in);
        (void)fclose(in);
    }
}
 
} // namespace libdap