/******************************************************************************
 *
 * Project:  WCS Client Driver
 * Purpose:  Implementation of utilities.
 * Author:   Ari Jolma <ari dot jolma at gmail dot com>
 *
 ******************************************************************************
 * Copyright (c) 2006, Frank Warmerdam
 * Copyright (c) 2008-2013, Even Rouault <even dot rouault at mines-paris dot org>
 * Copyright (c) 2017, Ari Jolma
 * Copyright (c) 2017, Finnish Environment Institute
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#include "ogr_spatialref.h"
#include "wcsutils.h"
#include <algorithm>

#define DIGITS "0123456789"

namespace WCSUtils {

void Swap(double &a, double &b)
{
    double tmp = a;
    a = b;
    b = tmp;
}

int CompareNumbers(const CPLString &a, const CPLString &b)
{
    size_t a_dot = a.find(".");
    size_t b_dot = b.find(".");
    CPLString a_p = a.substr(0, a_dot);
    CPLString b_p = b.substr(0, b_dot);
    int d = (int)(a_p.length()) - (int)(b_p.length());
    if (d < 0) {
        for (int i = 0; i < -1*d; ++i) {
            a_p = "0" + a_p;
        }
    } else if (d > 0) {
        for (int i = 0; i < d; ++i) {
            b_p = "0" + b_p;
        }
    }
    int c = strcmp(a_p, b_p);
    if (c < 0) {
        return -1;
    } else if (c > 0) {
        return 1;
    }
    a_p = a.substr(a_dot+1, std::string::npos);
    b_p = b.substr(b_dot+1, std::string::npos);
    d = (int)(a_p.length()) - (int)(b_p.length());
    if (d < 0) {
        for (int i = 0; i < -1*d; ++i) {
            a_p = a_p + "0";
        }
    } else if (d > 0) {
        for (int i = 0; i < d; ++i) {
            b_p = b_p + "0";
        }
    }
    c = strcmp(a_p, b_p);
    if (c < 0) {
        return -1;
    } else if (c > 0) {
        return 1;
    }
    return 0;
}

CPLString URLEncode(const CPLString &str)
{
    char *pszEncoded = CPLEscapeString(str, -1, CPLES_URL );
    CPLString str2 = pszEncoded;
    CPLFree( pszEncoded );
    return str2;
}

CPLString URLRemoveKey(const char *url, const CPLString &key)
{
    CPLString retval = url;
    CPLString key_is = key + "=";
    while (true) {
        size_t pos = retval.ifind(key_is);
        if (pos != std::string::npos) {
            size_t end = retval.find("&", pos);
            retval.erase(pos, end - pos + 1);
        } else {
            break;
        }
    }
    if (retval.back() == '&') {
        retval.erase(retval.size() - 1);
    }
    return retval;
}

std::vector<CPLString> &SwapFirstTwo(std::vector<CPLString> &array)
{
    if (array.size() >= 2) {
        CPLString tmp = array[0];
        array[0] = array[1];
        array[1] = tmp;
        return array;
    }
    return array;
}

std::vector<CPLString> Split(const char *value, const char *delim, bool swap_the_first_two)
{
    std::vector<CPLString> array;
    char **tokens = CSLTokenizeString2(
        value, delim, CSLT_STRIPLEADSPACES | CSLT_STRIPENDSPACES | CSLT_HONOURSTRINGS);
    int n = CSLCount(tokens);
    for (int i = 0; i < n; ++i) {
        array.push_back(tokens[i]);
    }
    CSLDestroy(tokens);
    if (swap_the_first_two && array.size() >= 2) {
        return SwapFirstTwo(array);
    }
    return array;
}

CPLString Join(const std::vector<CPLString> &array, const char *delim, bool swap_the_first_two)
{
    CPLString str;
    for (unsigned int i = 0; i < array.size(); ++i) {
        if (i > 0) {
            str += delim;
        }
        if (swap_the_first_two) {
            if (i == 0 && array.size() > 0) {
                str += array[1];
            } else if (i == 1) {
                str += array[0];
            }
        } else {
            str += array[i];
        }
    }
    return str;
}

std::vector<int> Ilist(const std::vector<CPLString> &array,
                       unsigned int from,
                       size_t count)
{
    std::vector<int> retval;
    for (unsigned int i = from; i < array.size() && i < from + count; ++i) {
        retval.push_back(atoi(array[i]));
    }
    return retval;
}

std::vector<double> Flist(const std::vector<CPLString> &array,
                          unsigned int from,
                          size_t count)
{
    std::vector<double> retval;
    for (unsigned int i = from; i < array.size() && i < from + count; ++i) {
        retval.push_back(CPLAtof(array[i]));
    }
    return retval;
}

int IndexOf(const CPLString &str, const std::vector<CPLString> &array)
{
    int index = -1;
    for (unsigned int i = 0; i < array.size(); ++i) {
        if (array[i] == str) {
            index = i;
            break;
        }
    }
    return index;
}

int IndexOf(int i, const std::vector<int> &array)
{
    int index = -1;
    for (unsigned int j = 0; j < array.size(); ++j) {
        if (array[j] == i) {
            index = j;
            break;
        }
    }
    return index;
}

std::vector<int> IndexOf(const std::vector<CPLString> &strs, const std::vector<CPLString> &array)
{
    std::vector<int> retval;
    for (unsigned int i = 0; i < strs.size(); ++i) {
        retval.push_back(IndexOf(strs[i], array));
    }
    return retval;
}

int IndexOf(const CPLString &key, const std::vector<std::vector<CPLString> > &kvps)
{
    int index = -1;
    for (unsigned int i = 0; i < kvps.size(); ++i) {
        if (kvps[i].size() > 1 && key == kvps[i][0]) {
            index = i;
            break;
        }
    }
    return index;
}

bool Contains(const std::vector<int> &array, int value)
{
    for (unsigned int i = 0; i < array.size(); ++i) {
        if (array[i] == value) {
            return true;
        }
    }
    return false;
}

CPLString FromParenthesis(const CPLString &s)
{
    size_t beg = s.find_first_of("(");
    size_t end = s.find_last_of(")");
    if (beg == std::string::npos || end == std::string::npos) {
        return "";
    }
    return s.substr(beg + 1, end - beg - 1);
}

std::vector<CPLString> ParseSubset(const std::vector<CPLString> &subset_array, const CPLString &dim)
{
    // array is SUBSET defs, a SUBSET def is dim[,crs](low[,high])
    std::vector<CPLString> retval;
    unsigned int i;
    CPLString params;
    for (i = 0; i < subset_array.size(); ++i) {
        params = subset_array[i];
        size_t pos = params.find(dim + "(");
        if (pos != std::string::npos) {
            retval.push_back(""); // crs
            break;
        }
        pos = params.find(dim + ",");
        if (pos != std::string::npos) {
            params.erase(0, pos + 1);
            pos = params.find("(");
            retval.push_back(params.substr(0, pos - 1));
            break;
        }
    }
    if (retval.size() > 0) {
        std::vector<CPLString> params_array = Split(FromParenthesis(params), ",");
        retval.push_back(params_array[0]);
        if (params_array.size() > 1) {
            retval.push_back(params_array[1]);
        } else {
            retval.push_back("");
        }
    }
    return retval;
}

/* -------------------------------------------------------------------- */
/*      FileIsReadable                                                  */
/* -------------------------------------------------------------------- */

bool FileIsReadable(const CPLString &filename)
{
    VSILFILE *file = VSIFOpenL(filename, "r");
    if (file) {
        VSIFCloseL(file);
        return true;
    }
    return false;
}

CPLString RemoveExt(const CPLString &filename)
{
    size_t pos = filename.find_last_of(".");
    if (pos != std::string::npos) {
        return filename.substr(0, pos);
    }
    return filename;
}

/* -------------------------------------------------------------------- */
/*      MakeDir                                                         */
/* -------------------------------------------------------------------- */

bool MakeDir(const CPLString &dirname)
{
    VSIStatBufL stat;
    if (VSIStatL(dirname, &stat) != 0) {
        CPLString parent = CPLGetDirname(dirname);
        if (!parent.empty() && parent != ".") {
            if (!MakeDir(parent)) {
                return false;
            }
        }
        return VSIMkdir(dirname, 0755) == 0;
    }
    return true;
}

/************************************************************************/
/*                       SearchChildWithValue()                         */
/************************************************************************/

CPLXMLNode *SearchChildWithValue(CPLXMLNode *node, const char *path, const char *value)
{
    if (node == nullptr) {
        return nullptr;
    }
    for (CPLXMLNode *child = node->psChild; child != nullptr; child = child->psNext) {
        if (EQUAL(CPLGetXMLValue(child, path, ""), value)) {
            return child;
        }
    }
    return nullptr;
}

bool CPLGetXMLBoolean(CPLXMLNode *poRoot, const char *pszPath)
{
    // returns true if path exists and does not contain untrue value
    poRoot = CPLGetXMLNode(poRoot, pszPath);
    if (poRoot == nullptr) {
        return false;
    }
    return CPLTestBool(CPLGetXMLValue(poRoot, nullptr, ""));
}

bool CPLUpdateXML(CPLXMLNode *poRoot, const char *pszPath, const char *new_value)
{
    CPLString old_value = CPLGetXMLValue(poRoot, pszPath, "");
    if (new_value != old_value) {
        CPLSetXMLValue(poRoot, pszPath, new_value);
        return true;
    }
    return false;
}

/* -------------------------------------------------------------------- */
/*      SetupCache                                                      */
/*      Cache is a directory                                            */
/* -------------------------------------------------------------------- */

bool SetupCache(CPLString &cache, bool clear)
{
    if (cache == "") {
#ifdef WIN32
        const char* home = CPLGetConfigOption("USERPROFILE", nullptr);
#else
        const char* home = CPLGetConfigOption("HOME", nullptr);
#endif
        if (home) {
            cache = CPLFormFilename(home, ".gdal", nullptr);
        } else {
            const char *dir = CPLGetConfigOption("CPL_TMPDIR", nullptr);
            if (!dir) dir = CPLGetConfigOption( "TMPDIR", nullptr );
            if (!dir) dir = CPLGetConfigOption( "TEMP", nullptr );
            const char* username = CPLGetConfigOption("USERNAME", nullptr);
            if (!username) username = CPLGetConfigOption("USER", nullptr);
            if (dir && username) {
                CPLString subdir = ".gdal_";
                subdir += username;
                cache = CPLFormFilename(dir, subdir, nullptr);
            }
        }
        cache = CPLFormFilename(cache, "wcs_cache", nullptr);
    }
    if (!MakeDir(cache)) {
        return false;
    }
    if (clear) {
        char **folder = VSIReadDir(cache);
        int size = folder ? CSLCount(folder) : 0;
        for (int i = 0; i < size; i++) {
            if (folder[i][0] == '.') {
                continue;
            }
            CPLString filepath = CPLFormFilename(cache, folder[i], nullptr);
            remove(filepath);
        }
        CSLDestroy(folder);
    }
    // make sure the index exists and is writable
    CPLString db = CPLFormFilename(cache, "db", nullptr);
    VSILFILE *f = VSIFOpenL(db, "r");
    if (f) {
        VSIFCloseL(f);
    } else {
        f = VSIFOpenL(db, "w");
        if (f) {
            VSIFCloseL(f);
        } else {
            CPLError(CE_Failure, CPLE_FileIO, "Can't open file '%s': %i\n", db.c_str(), errno);
            return false;
        }
    }
    srand((unsigned int)time(nullptr)); // not to have the same names in the cache
    return true;
}

static bool CompareStrings(const CPLString &a, const CPLString &b)
{
    return strcmp(a, b) < 0;
}

std::vector<CPLString> ReadCache(const CPLString &cache)
{
    std::vector<CPLString> contents;
    CPLString db = CPLFormFilename(cache, "db", nullptr);
    char **data = CSLLoad(db);
    if (data) {
        for (int i = 0; data[i]; ++i) {
            char *val = strchr(data[i], '=');
            if (val != nullptr && *val == '=') {
                val += 1;
                if (strcmp(val, "bar") != 0) {
                    contents.push_back(val);
                }
            }
        }
        CSLDestroy(data);
    }
    std::sort(contents.begin(), contents.end(), CompareStrings);
    return contents;
}

/* -------------------------------------------------------------------- */
/*      DeleteEntryFromCache                                            */
/*      Examines the 'db' file in the cache, which contains             */
/*      unique key=value pairs, one per line. This function             */
/*      deletes pairs based on the given key and/or value.              */
/*      If key or value is empty it is not considered.                  */
/*      The key is taken as a basename of a file in the cache           */
/*      and all files with the basename is deleted.                     */
/* -------------------------------------------------------------------- */

bool DeleteEntryFromCache(const CPLString &cache, const CPLString &key, const CPLString &value)
{
    // depending on which one of key & value is not "" delete the relevant entry
    CPLString db = CPLFormFilename(cache, "db", nullptr);
    char **data = CSLLoad(db); // returns NULL in error and for empty files
    char **data2 = CSLAddNameValue(nullptr, "foo", "bar");
    CPLString filename = "";
    if (data) {
        for (int i = 0; data[i]; ++i) {
            char *val = strchr(data[i], '=');
            if (val != nullptr && *val == '=') {
                *val = '\0';
                val = val + 1;
                if ((key != "" && key == data[i])
                    || (value != "" && value == val)
                    || (strcmp(data[i], "foo") == 0))
                {
                    if (key != "") {
                        filename = data[i];
                    } else if (value != "") {
                        filename = data[i];
                    }
                    continue;
                }
                data2 = CSLAddNameValue(data2, data[i], val);
            }
        }
        CSLDestroy(data);
    }
    CSLSave(data2, db); // returns 0 in error and for empty arrays
    CSLDestroy(data2);
    if (filename != "") {
        char **folder = VSIReadDir(cache);
        int size = folder ? CSLCount(folder) : 0;
        for (int i = 0; i < size; i++) {
            if (folder[i][0] == '.') {
                continue;
            }
            CPLString name = folder[i];
            if (name.find(filename) != std::string::npos) {
                CPLString filepath = CPLFormFilename(cache, name, nullptr);
                if (VSIUnlink(filepath) == -1) {
                    // error but can't do much, raise a warning?
                }
            }
        }
        CSLDestroy(folder);
    }
    return true;
}

/* -------------------------------------------------------------------- */
/*      SearchCache                                                     */
/*      The key,value pairs in the cache index file 'db' is searched    */
/*      for the first pair where the value is the given url. If one     */
/*      is found, the filename is formed from the cache directory name, */
/*      the key, and the ext.                                           */
/* -------------------------------------------------------------------- */

CPLErr SearchCache(const CPLString &cache,
                   const CPLString &url,
                   CPLString &filename,
                   const CPLString &ext,
                   bool &found)
{
    found = false;
    CPLString db = CPLFormFilename(cache, "db", nullptr);
    VSILFILE *f = VSIFOpenL(db, "r");
    if (!f) {
        CPLError(CE_Failure, CPLE_FileIO, "Can't open file '%s': %i\n", db.c_str(), errno);
        return CE_Failure;
    }
    while (const char *line = CPLReadLineL(f)) {
        char *value = strchr((char *)line, '=');
        if (value == nullptr || *value != '=') {
            continue;
        }
        *value = '\0';
        if (strcmp(url, value + 1) == 0) {
            filename = line;
            found = true;
            break;
        }
    }
    VSIFCloseL(f);
    if (found) {
        filename = CPLFormFilename(cache, (filename + ext).c_str(), nullptr);
        found = FileIsReadable(filename);
        // if not readable, we should delete the entry
    }
    return CE_None;
}

/* -------------------------------------------------------------------- */
/*      AddEntryToCache                                                 */
/*      A new unique key is created into the database based on the      */
/*      filename replacing X with a random ascii character.             */
/*      The returned filename is a path formed from the cache directory */
/*      name, the filename, and the ext.                                */
/* -------------------------------------------------------------------- */

CPLErr AddEntryToCache(const CPLString &cache,
                       const CPLString &url,
                       CPLString &filename,
                       const CPLString &ext)
{
    // todo: check for lock and do something if locked(?)
    // todo: lock the cache
    // assuming the url is not in the cache
    CPLString store = filename;
    CPLString db = CPLFormFilename(cache, "db", nullptr);
    VSILFILE *f = VSIFOpenL(db, "a");
    if (!f) {
        CPLError(CE_Failure, CPLE_FileIO, "Can't open file '%s': %i\n", db.c_str(), errno);
        return CE_Failure;
    }

    // create a new file into the cache using filename as template
    CPLString path = "";
    VSIStatBufL stat;
    do {
        filename = store;
        static const char chars[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        for (size_t i = 0; i < filename.length(); ++i) {
            if (filename.at(i) == 'X') {
                // coverity[dont_call]
                filename.replace(i, 1, 1, chars[rand() % (sizeof(chars)-1)]);
            }
        }
        // replace X with random character from a-zA-Z
        path = CPLFormFilename(cache, (filename + ext).c_str(), nullptr);
    } while (VSIStatExL(path, &stat, VSI_STAT_EXISTS_FLAG) == 0);
    VSILFILE *f2 = VSIFOpenL(path, "w");
    if (f2) {
        VSIFCloseL(f2);
    }

    CPLString entry = filename + "=" + url + "\n"; // '=' for compatibility with CSL
    VSIFWriteL(entry.c_str(), sizeof(char), entry.size(), f);
    VSIFCloseL(f);

    filename = path;
    return CE_None;
}

// steps into element 'from' and adds values of elements 'keys' into the metadata
// 'path' is the key that is used for metadata and it is appended with 'from'
// path may be later used to get metadata from elements below 'from' so
// it is returned in the appended form
CPLXMLNode *AddSimpleMetaData(char ***metadata,
                              CPLXMLNode *node,
                              CPLString &path,
                              const CPLString &from,
                              const std::vector<CPLString> &keys)
{
    CPLXMLNode *node2 = CPLGetXMLNode(node, from);
    if (node2) {
        path = path + from + ".";
        for (unsigned int i = 0; i < keys.size(); i++) {
            CPLXMLNode *node3 = CPLGetXMLNode(node2, keys[i]);
            if (node3) {
                CPLString name = path + keys[i];
                CPLString value = CPLGetXMLValue(node3, nullptr, "");
                value.Trim();
                *metadata = CSLSetNameValue(*metadata, name, value);
            }
        }
    }
    return node2;
}

CPLString GetKeywords(CPLXMLNode *root,
                      const CPLString &path,
                      const CPLString &kw)
{
    CPLString words = "";
    CPLXMLNode *keywords = (path != "") ? CPLGetXMLNode(root, path) : root;
    if (keywords) {
        std::vector<unsigned int> epsg_codes;
        for (CPLXMLNode *node = keywords->psChild; node != nullptr; node = node->psNext) {
            if (node->eType != CXT_Element) {
                continue;
            }
            if (kw == node->pszValue) {
                CPLString word = CPLGetXMLValue(node, nullptr, "");
                word.Trim();

                // crs, replace "http://www.opengis.net/def/crs/EPSG/0/" with EPSG:
                const char *epsg = "http://www.opengis.net/def/crs/EPSG/0/";
                size_t pos = word.find(epsg);
                if (pos == 0) {
                    CPLString code = word.substr(strlen(epsg), std::string::npos);
                    if (code.find_first_not_of(DIGITS) == std::string::npos) {
                        epsg_codes.push_back(atoi(code));
                        continue;
                    }
                }

                // profiles, remove http://www.opengis.net/spec/
                // interpolation, remove http://www.opengis.net/def/interpolation/OGC/1/

                const char *spec[] = {
                    "http://www.opengis.net/spec/",
                    "http://www.opengis.net/def/interpolation/OGC/1/"
                };
                for (unsigned int i = 0; i < CPL_ARRAYSIZE(spec); i++) {
                    pos = word.find(spec[i]);
                    if (pos != std::string::npos) {
                        word.erase(pos, strlen(spec[i]));
                    }
                }

                if (words != "") {
                    words += ",";
                }
                words += word;
            }
        }
        if (epsg_codes.size() > 0) {
            CPLString codes;
            std::sort(epsg_codes.begin(), epsg_codes.end());
            unsigned int pajazzo = 0, i = 0, a = 0, b = 0;
            while (1) {
                unsigned int c = i < epsg_codes.size() ? epsg_codes[i] : 0;
                if (pajazzo == 1) {
                    if (c > a + 1) {
                        if (codes != "") {
                            codes += ",";
                        }
                        codes += CPLString().Printf("%i", a);
                        a = c;
                    } else if (c >= a) {
                        b = c;
                        pajazzo = 2;
                    }
                } else if (pajazzo == 2) {
                    if (c > b + 1) {
                        if (codes != "") {
                            codes += ",";
                        }
                        codes += CPLString().Printf("%i:%i", a, b);
                        a = c;
                        pajazzo = 1;
                    } else if (c >= b) {
                        b = c;
                    }
                } else { // pajazzo == 0
                    a = c;
                    pajazzo = 1;
                }
                if (i == epsg_codes.size()) {
                    break;
                }
                ++i;
            }
            if (words != "") {
                words += ",";
            }
            words += "EPSG:" + codes;
        }
    }
    return words;
}

CPLString ParseCRS(CPLXMLNode *node)
{
    // test for attrs crs (OWS) and srsName (GML), and text contents of subnode (GridBaseCRS)
    CPLString crs = CPLGetXMLValue(node, "crs", "");
    if (crs == "") {
        crs = CPLGetXMLValue(node, "srsName", "");
        if (crs == "") {
            crs = CPLGetXMLValue(node, "GridBaseCRS", "");
        }
    }
    if (crs == "") {
        return crs;
    }
    // split compound names
    // see for example
    // http://www.eurogeographics.org/sites/default/files/2016-01-18_INSPIRE-KEN-CovFaq.pdf
    size_t pos = crs.find("?");
    if (pos != std::string::npos) {
        if (crs.find("crs-compound?") != std::string::npos) { // 1=uri&2=uri...
            // assuming the first is for X,Y
            crs = crs.substr(pos+1);
            pos = crs.find("&");
            if (pos != std::string::npos) {
                pos = pos - 2;
            }
            crs = crs.substr(2, pos);
        }
    }
    return crs;
}

// if appropriate, try to create WKT description from CRS name
// return false if failure
// appropriate means, that the name is a real CRS
bool CRS2Projection(const CPLString &crs, OGRSpatialReference *sr, char **projection)
{
    if (*projection != nullptr) {
        CPLFree(*projection);
    }
    *projection = nullptr;
    if (crs.empty()) {
        return true;
    }
    if (crs.find(":imageCRS") != std::string::npos
        || crs.find("/Index1D") != std::string::npos
        || crs.find("/Index2D") != std::string::npos
        || crs.find("/Index3D") != std::string::npos
        || crs.find("/AnsiDate") != std::string::npos
        )
    {
        // not a map projection
        return true;
    }
    CPLString crs2 = crs;
    // rasdaman uses urls, which return gml:ProjectedCRS XML, which is not recognized by GDAL currently
    if (crs2.find("EPSG") != std::string::npos) { // ...EPSG...(\d+)
        size_t pos1 = crs2.find_last_of(DIGITS);
        if (pos1 != std::string::npos) {
            size_t pos2 = pos1 - 1;
            char c = crs2.at(pos2);
            while (strchr(DIGITS, c)) {
                pos2 = pos2 - 1;
                c = crs2.at(pos2);
            }
            crs2 = "EPSGA:" + crs2.substr(pos2 + 1, pos1 - pos2);
        }
    }
    OGRSpatialReference local_sr;
    OGRSpatialReference *sr_pointer = sr != nullptr ? sr : &local_sr;
    if (sr_pointer->SetFromUserInput(crs2) == OGRERR_NONE) {
        sr_pointer->exportToWkt(projection);
        return true;
    }
    return false;
}

bool CRSImpliesAxisOrderSwap(const CPLString &crs, bool &swap, char **projection)
{
    OGRSpatialReference oSRS;
    char *tmp = nullptr;
    swap = false;
    if (!CRS2Projection(crs, &oSRS, &tmp)) {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Unable to interpret coverage CRS '%s'.", crs.c_str() );
        CPLFree(tmp);
        return false;
    }
    if (tmp) {
        if (projection != nullptr) {
            *projection = tmp;
        } else {
            CPLFree(tmp);
        }
        swap = oSRS.EPSGTreatsAsLatLong() || oSRS.EPSGTreatsAsNorthingEasting();
    }
    return true;
}

std::vector<std::vector<int> > ParseGridEnvelope(CPLXMLNode *node,
                                                bool swap_the_first_two)
{
    std::vector<std::vector<int> > envelope;
    std::vector<CPLString> array = Split(CPLGetXMLValue(node, "low", ""), " ", swap_the_first_two);
    std::vector<int> lows;
    for (unsigned int i = 0; i < array.size(); ++i) {
        lows.push_back(atoi(array[i]));
    }
    envelope.push_back(lows);
    array = Split(CPLGetXMLValue(node, "high", ""), " ", swap_the_first_two);
    std::vector<int> highs;
    for (unsigned int i = 0; i < array.size(); ++i) {
        highs.push_back(atoi(array[i]));
    }
    envelope.push_back(highs);
    return envelope;
}

std::vector<CPLString> ParseBoundingBox(CPLXMLNode *node)
{
    std::vector<CPLString> bbox;
    CPLString lc = CPLGetXMLValue(node, "lowerCorner", ""), uc;
    if (lc == "") {
        lc = CPLGetXMLValue(node, "LowerCorner", "");
    }
    if (lc == "") {
        for (CPLXMLNode *n = node->psChild; n != nullptr; n = n->psNext) {
            if (n->eType != CXT_Element || !EQUAL(n->pszValue, "pos")) {
                continue;
            }
            if (lc == "") {
                lc = CPLGetXMLValue(node, nullptr, "");
            } else {
                uc = CPLGetXMLValue(node, nullptr, "");
            }
        }
    } else {
        uc = CPLGetXMLValue(node, "upperCorner", "");
        if (uc == "") {
            uc = CPLGetXMLValue(node, "UpperCorner", "");
        }
    }
    if (lc != "" && uc != "") {
        bbox.push_back(lc);
        bbox.push_back(uc);
    }
    return bbox;
}

}
