NAME

       pngunpack.c

SYNOPSIS

       #include <stdio.h>
       #include <stdlib.h>
       #include 'grib2.h'

   Functions
       int dec_png (unsigned char *, g2int *, g2int *, char *)
           Decode PNG.
       g2int pngunpack (unsigned char *cpack, g2int len, g2int *idrstmpl, g2int ndpts, g2float
           *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.

Detailed Description

       Author
           Stephen Gilbert

       Date
           2003-08-27

       Definition in file pngunpack.c.

Function Documentation

   int dec_png (unsigned char * pngbuf, g2int * width, g2int * height, char * cout)
       Decode PNG.

       Parameters
           pngbuf Pointer to PNG buffer.
           width Pointer to width.
           height Pointer to height.
           cout Output buffer.

       Returns
           0 for success, error code otherwise.

       Author
           Stephen Gilbert

       Definition at line 67 of file dec_png.c.

       References user_read_data().

       Referenced by pngunpack().

   g2int pngunpack (unsigned char * cpack, g2int len, g2int * idrstmpl, g2int ndpts, g2float *
       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
           0 for success, 1 for memory allocation error.

       Author
           Stephen Gilbert

       Date
           2003-08-27

       Definition at line 27 of file pngunpack.c.

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

       Referenced by g2_unpack7().

Author

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