g2clib's Introduction
August 06, 2013 W/SIB:VUONG g2clib Library. This library contains "C" decoder/encoder routines for GRIB edition 2. The user API for the GRIB2 routines is described in file "grib2c.doc". This "C" source code conatins many uses of the C++ comment style "//". Please make sure you include the appropriate compiler option in the CFLAGS variable in the makefile to allow the use of "//" comment indicators. We have added support for PNG and JPEG2000 image compression algorithms within the GRIB2 standard. If you would like to compile this library to utilize these GRIB2 Templates, make sure that -DUSE_PNG and -DUSE_JPEG2000 are specified in the DEFS variable in the makefile. You will also need to download and install the external libraries listed below, if they are not already installed on your system. If you do not wish to bother with the external libs and don't need PNG and JPEG2000 support, you can remove the -DUSE_PNG and -DUSE_JPEG2000 flags from the DEFS variable in the makefile. ------------------------------------------------------------------------------- External Libraries: libjasper.a - This library is a C implementation of the JPEG-2000 Part-1 standard (i.e., ISO/IEC 15444-1). This library is required if JPEG2000 support in GRIB2 is desired. If not, remove the -DUSE_JPEG2000 option from the DEFS variable in the makefile. Download version jasper-1.900.1 from the JasPer Project's home page, http://www.ece.uvic.ca/~mdadams/jasper/. More information about JPEG2000 can be found at http://www.jpeg.org/JPEG2000.html. libpng.a This library is a C implementation of the Portable Network Graphics PNG image compression format. This library is required if PNG support in GRIB2 is desired. If not, remove the -DUSE_PNG option from the DEFS variable in the makefile. If not already installed on your system, download version libpng-1.2.44 from http://www.libpng.org/pub/png/libpng.html. More information about PNG can be found at http://www.libpng.org/pub/png/. libz.a This library contains compression/decompression routines used by libpng.a for PNG image compression support. This library is required if PNG support in GRIB2 is desired. If not, remove the -DUSE_PNG option from the DEFS variable in g2lib/makefile. If not already installed on your system, download version zlib-1.2.6 from http://www.gzip.org/zlib/.
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