NAME

       pngunpack.c - Unpack data packed with PNG compression.

SYNOPSIS

       #include 'grib2_int.h'
       #include <stdio.h>
       #include <stdlib.h>

   Functions
       int g2c_pngunpackd (unsigned char *cpack, size_t len, int *idrstmpl, size_t ndpts, double *fld)
           This subroutine unpacks a data field that was packed into a PNG image format using info from the
           GRIB2 Data Representation Template 5.41 or 5.40010.
       int g2c_pngunpackf (unsigned char *cpack, size_t len, int *idrstmpl, size_t ndpts, float *fld)
           This subroutine unpacks a data field that was packed into a PNG image format using info from the
           GRIB2 Data Representation Template 5.41 or 5.40010.
       g2int pngunpack (unsigned char *cpack, g2int len, g2int *idrstmpl, g2int ndpts, float *fld)
           This subroutine unpacks a data field that was packed into a PNG image format using info from the
           GRIB2 Data Representation Template 5.41 or 5.40010.
       static int pngunpack_int (unsigned char *cpack, g2int len, g2int *idrstmpl, g2int ndpts, void *fld, int
           fld_is_double, int verbose)
           Unpack a data field that was packed into a PNG image format using info from the GRIB2 Data
           Representation Template 5.41 or 5.40010.

Detailed Description

       Unpack data packed with PNG compression.

       Author
           Stephen Gilbert

       Date
           2003-08-27

       Definition in file pngunpack.c.

Function Documentation

   int g2c_pngunpackd (unsigned char * cpack, size_t len, int * idrstmpl, size_t ndpts, double * fld)
       This subroutine unpacks a data field that was packed into a PNG image format using info from the GRIB2
       Data Representation Template 5.41 or 5.40010.

       Parameters
           cpack The packed data field (character*1 array).
           len length of packed field cpack().
           idrstmpl Pointer to array of values for Data Representation Template 5.41 or 5.40010.
           ndpts The number of data values to unpack.
           fld Contains the unpacked data values.

       Returns

           • G2C_NOERROR No Error.

           • G2C_ENOMEM Out of memory.

       Author
           Ed Hartnett

       Date
           Aug 8, 2022

       Definition at line 188 of file pngunpack.c.

       References G2C_PNG_DRS_TEMPLATE_LEN, and pngunpack_int().

   int g2c_pngunpackf (unsigned char * cpack, size_t len, int * idrstmpl, size_t ndpts, float * fld)
       This  subroutine  unpacks  a data field that was packed into a PNG image format using info from the GRIB2
       Data Representation Template 5.41 or 5.40010.

       Parameters
           cpack The packed data field (character*1 array).
           len length of packed field cpack().
           idrstmpl Pointer to array of values for Data Representation Template 5.41 or 5.40010.
           ndpts The number of data values to unpack.
           fld Contains the unpacked data values.

       Returns

           • G2C_NOERROR No Error.

           • G2C_ENOMEM Out of memory.

       Author
           Ed Hartnett

       Date
           Sep 8, 2022

       Definition at line 156 of file pngunpack.c.

       References G2C_PNG_DRS_TEMPLATE_LEN, and pngunpack_int().

   g2int pngunpack (unsigned char * cpack, g2int len, g2int * idrstmpl, g2int ndpts, float * fld)
       This subroutine unpacks a data field that was packed into a PNG image format using info  from  the  GRIB2
       Data Representation Template 5.41 or 5.40010.

       Parameters
           cpack The packed data field (character*1 array).
           len length of packed field cpack().
           idrstmpl Pointer to array of values for Data Representation Template 5.41 or 5.40010.
           ndpts The number of data values to unpack.
           fld Contains the unpacked data values.

       Returns

           • G2C_NOERROR No error.

           • G2_JPCUNPACK_MEM Out of memory.

       Author
           Stephen Gilbert

       Date
           2003-08-27

       Author
           Ed Hartnett

       Definition at line 126 of file pngunpack.c.

       References G2_JPCUNPACK_MEM, G2C_ENOMEM, and pngunpack_int().

       Referenced by g2c_unpack7_int().

   static  int  pngunpack_int  (unsigned char * cpack, g2int len, g2int * idrstmpl, g2int ndpts, void * fld, int
       fld_is_double, int verbose) [static]
       Unpack a data field that was packed into a PNG image format using info from the GRIB2 Data Representation
       Template 5.41 or 5.40010.

       Parameters
           cpack The packed data field (character*1 array).
           len The length of packed field cpack().
           idrstmpl Pointer to array of values for Data Representation Template 5.41 or 5.40010.
           ndpts The number of data values to unpack.
           fld Pointer that will get the unpacked data values.
           fld_is_double If non-zero, then fld will get data as double, otherwise float.
           verbose If non-zero, error messages will be printed in case of error. Otherwise, error codes will  be
           return  but  no  error messages printed. Calls to the original g2c API may cause error messages to be
           printed in case of error. For the new g2c_ API, no error messages will be printed - instead an  error
           code will be returned. Call g2c_strerror() to get the error message for any error code.

       Returns

           • G2C_NOERROR No Error.

           • G2C_ENOMEM Out of memory.

       Author
           Stephen Gilbert, Ed Hartnett

       Date
           Aug 8, 2022

       Definition at line 40 of file pngunpack.c.

       References dec_png(), G2C_ENOMEM, gbits(), int_power(), LOG, and rdieee().

       Referenced by g2c_pngunpackd(), g2c_pngunpackf(), and pngunpack().

Author

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NCEPLIBS-g2c                                      Version 2.1.0                                   pngunpack.c(3)