Add ability to read compressed RINEX navigation files

src/utils/rinex2assist/CMakeLists.txt

@@ -26,6 +26,8 @@ endif()
 
 set(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} ${GPSTK_INCLUDE_DIR}/gpstk)
 
+find_package(Boost COMPONENTS iostreams serialization REQUIRED)
+
 include_directories(
     ${CMAKE_SOURCE_DIR}/src/core/system_parameters
     ${GFlags_INCLUDE_DIRS}

src/utils/rinex2assist/README.md

@@ -1,7 +1,7 @@
 Rinex2assist
 ------------
 
-This program generates ephemeris XML files from RINEX navigation data files. The usage is as follows:
+This program reads data from RINEX navigation files and generates XML files that can be read by GNSS-SDR as Assisted GNSS data. The usage is as follows:
 
 ```
 $ rinex2assist /path/to/RINEX_nav_file 
@@ -9,16 +9,34 @@ $ rinex2assist /path/to/RINEX_nav_file
 
 The argument is mandatory (the name of the RINEX navigation file). The name `gps_ephemeris.xml` is given to the output if GPS NAV data is fould. If the RINEX file contains Galileo data, the corresponding `gal_ephemeris.xml` file will be generated. The program is also able to extract parameters of the UTC and the Ionospheric models from the RINEX header, if available. They will be called `gps_utc_model.xml`, `gps_iono.xml`, `gal_utc_model.xml` and `gal_iono.xml`.
 
-
-The program accepts either versions 2.xx or 3.xx for the RINEX navigation data file.
-
 There are some servers available for downloading RINEX navigation files. For instance:
   * NASA: [ftp://cddis.gsfc.nasa.gov/pub/gnss/data/hourly/](ftp://gssc.esa.int/gnss/data/hourly/)
   * ESA: [ftp://gssc.esa.int/gnss/data/hourly/](ftp://gssc.esa.int/gnss/data/hourly/)
 
 Just make sure to pick up a [station near you](http://gpspp.sakura.ne.jp/gmap/igsnet.htm).
 
-An example of GNSS-SDR configuration using ephemeris and UTC and ionospheric model parameters for GPS L1 and Galileo signals is shown below:
+The program accepts either versions 2.xx or 3.xx for the RINEX navigation data file, as well as compressed files (ending in `.gz`).
+
+Examples:
+
+```
+$ rinex2assist EBRE00ESP_R_20183290400_01H_GN.rnx.gz
+Generated file: gps_ephemeris.xml
+Generated file: gps_utc_model.xml
+Generated file: gps_iono.xml
+```
+
+and
+
+```
+$ rinex2assist EBRE00ESP_R_20183290000_01H_EN.rnx.gz
+Generated file: gal_ephemeris.xml
+Generated file: gal_utc_model.xml
+Generated file: gal_iono.xml
+```
+
+
+An example of GNSS-SDR configuration using ephemeris, UTC and ionospheric model parameters for GPS L1 and Galileo signals is shown below:
 
 ```
 GNSS-SDR.AGNSS_XML_enabled=true

src/utils/rinex2assist/main.cc

@@ -42,6 +42,9 @@
 #include <gpstk/Rinex3NavStream.hpp>
 #include <boost/archive/xml_oarchive.hpp>
 #include <boost/serialization/map.hpp>
+#include <boost/iostreams/filtering_streambuf.hpp>
+#include <boost/iostreams/copy.hpp>
+#include <boost/iostreams/filter/gzip.hpp>
 #include <iostream>
 
 
@@ -70,6 +73,33 @@ int main(int argc, char** argv)
         }
     std::string xml_filename;
 
+    // Uncompress if RINEX file is gzipped
+    std::string rinex_filename(argv[1]);
+    std::size_t found = rinex_filename.find_last_of(".");
+    if (found != std::string::npos)
+        {
+            if ((rinex_filename.substr(found + 1, found + 3).compare("gz") == 0))
+                {
+                    std::cerr << "Hello" << std::endl;
+                    std::ifstream file(rinex_filename, std::ios_base::in | std::ios_base::binary);
+                    boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
+                    try
+                        {
+                            in.push(boost::iostreams::gzip_decompressor());
+                        }
+                    catch (const boost::exception& e)
+                        {
+                            std::cerr << "Could not decompress file " << rinex_filename << std::endl;
+                            return 1;
+                        }
+                    in.push(file);
+                    std::string rinex_filename_unzipped = rinex_filename.substr(0, found);
+                    std::ofstream output_file(rinex_filename_unzipped.c_str(), std::ios_base::out | std::ios_base::binary);
+                    boost::iostreams::copy(in, output_file);
+                    rinex_filename = rinex_filename_unzipped;
+                }
+        }
+
     std::map<int, Gps_Ephemeris> eph_map;
     std::map<int, Galileo_Ephemeris> eph_gal_map;
 
@@ -83,7 +113,7 @@ int main(int argc, char** argv)
     try
         {
             // Read nav file
-            gpstk::Rinex3NavStream rnffs(argv[1]);  // Open navigation data file
+            gpstk::Rinex3NavStream rnffs(rinex_filename.c_str());  // Open navigation data file
             gpstk::Rinex3NavData rne;
             gpstk::Rinex3NavHeader hdr;