dec_png.c File Reference

PNG functions. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <png.h>
#include "grib2_int.h"

Go to the source code of this file.

Typedefs
typedef struct png_stream	png_stream
	Typedef for PNG stream.

Functions
int	dec_png (unsigned char *pngbuf, g2int *width, g2int *height, unsigned char *cout)
	Decode PNG.
void	user_read_data (png_structp png_ptr, png_bytep data, png_uint_32 length)
	Custom read function used so that libpng will read a PNG stream from memory instead of a file on disk.

Detailed Description

PNG functions.

Author

Stephen Gilbert

Definition in file dec_png.c.

Typedef Documentation

png_stream

typedef struct png_stream png_stream

Typedef for PNG stream.

Definition at line 20 of file dec_png.c.

Function Documentation

dec_png()

int dec_png	(	unsigned char *	pngbuf,
		g2int *	width,
		g2int *	height,
		unsigned 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 61 of file dec_png.c.

References user_read_data().

Referenced by pngunpack_int().

user_read_data()

void user_read_data	(	png_structp	png_ptr,
		png_bytep	data,
		png_uint_32	length
	)

Custom read function used so that libpng will read a PNG stream from memory instead of a file on disk.

Parameters

png_ptr	Pointer to PNG.
data	Pointer to data.
length	Length.

Author

Stephen Gilbert

Definition at line 35 of file dec_png.c.

Referenced by dec_png().