Imported from libpng-0.71.tar

pngtest.c

@@ -0,0 +1,180 @@
+/* pngtest.c - a simple test program to test libpng 
+
+   libpng 1.0 beta 1 - version 0.71
+   For conditions of distribution and use, see copyright notice in png.h
+   Copyright (c) 1995 Guy Eric Schalnat, Group 42, Inc.
+   June 26, 1995
+   */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "png.h"
+
+#ifdef __TURBOC__
+#include <mem.h>
+#endif
+
+/* defined so I can write to a file on gui/windowing platforms */
+#define STDERR stderr
+
+/* input and output filenames */
+char inname[] = "pngtest.png";
+char outname[] = "pngout.png";
+
+png_struct read_ptr;
+png_struct write_ptr;
+png_info info_ptr;
+png_info end_info;
+
+char inbuf[256], outbuf[256];
+
+int main()
+{
+	FILE *fpin, *fpout;
+	png_byte *row_buf;
+	png_uint_32 rowbytes;
+   png_uint_32 y;
+	int channels, num_pass, pass;
+
+	row_buf = (png_byte *)0;
+
+	fpin = fopen(inname, "rb");
+	if (!fpin)
+	{
+		fprintf(STDERR, "Could not find input file %s\n", inname);
+		return -1;
+	}
+
+	fpout = fopen(outname, "wb");
+	if (!fpin)
+	{
+		fprintf(STDERR, "could not open output file %s\n", outname);
+		fclose(fpin);
+		return -1;
+	}
+
+	if (setjmp(read_ptr.jmpbuf))
+	{
+		fprintf(STDERR, "libpng read error\n");
+		fclose(fpin);
+		fclose(fpout);
+		return -1;
+	}
+
+	if (setjmp(write_ptr.jmpbuf))
+	{
+		fprintf(STDERR, "libpng write error\n");
+		fclose(fpin);
+		fclose(fpout);
+		return -1;
+	}
+
+	png_read_init(&read_ptr);
+	png_write_init(&write_ptr);
+	png_info_init(&info_ptr);
+	png_info_init(&end_info);
+
+	png_init_io(&read_ptr, fpin);
+	png_init_io(&write_ptr, fpout);
+
+	png_read_info(&read_ptr, &info_ptr);
+	png_write_info(&write_ptr, &info_ptr);
+
+	if ((info_ptr.color_type & 3) == 2)
+		channels = 3;
+	else
+		channels = 1;
+	if (info_ptr.color_type & 4)
+		channels++;
+
+	rowbytes = ((info_ptr.width * info_ptr.bit_depth * channels + 7) >> 3);
+	row_buf = (png_byte *)malloc((size_t)rowbytes);
+	if (!row_buf)
+	{
+		fprintf(STDERR, "no memory to allocate row buffer\n");
+		png_read_destroy(&read_ptr, &info_ptr, (png_info *)0);
+		png_write_destroy(&write_ptr);
+		fclose(fpin);
+		fclose(fpout);
+		return -1;
+	}
+
+	if (info_ptr.interlace_type)
+	{
+		num_pass = png_set_interlace_handling(&read_ptr);
+		num_pass = png_set_interlace_handling(&write_ptr);
+	}
+	else
+	{
+		num_pass = 1;
+	}
+
+	for (pass = 0; pass < num_pass; pass++)
+	{
+		for (y = 0; y < info_ptr.height; y++)
+		{
+			png_read_rows(&read_ptr, &row_buf, (png_byte **)0, 1);
+			png_write_rows(&write_ptr, &row_buf, 1);
+		}
+	}
+
+	png_read_end(&read_ptr, &end_info);
+	png_write_end(&write_ptr, &end_info);
+
+	png_read_destroy(&read_ptr, &info_ptr, &end_info);
+	png_write_destroy(&write_ptr);
+
+	fclose(fpin);
+	fclose(fpout);
+
+	free(row_buf);
+
+	fpin = fopen(inname, "rb");
+
+	if (!fpin)
+	{
+		fprintf(STDERR, "could not find file %s\n", inname);
+		return -1;
+	}
+
+	fpout = fopen(outname, "rb");
+	if (!fpout)
+	{
+		fprintf(STDERR, "could not find file %s\n", outname);
+		fclose(fpin);
+		return -1;
+	}
+
+	while (1)
+	{
+		int num_in, num_out;
+
+		num_in = fread(inbuf, 1, 256, fpin);
+		num_out = fread(outbuf, 1, 256, fpout);
+
+		if (num_in != num_out)
+		{
+			fprintf(STDERR, "files are of a different size\n");
+			fclose(fpin);
+			fclose(fpout);
+			return -1;
+		}
+
+		if (!num_in)
+			break;
+
+		if (memcmp(inbuf, outbuf, num_in))
+		{
+			fprintf(STDERR, "files are different\n");
+			fclose(fpin);
+			fclose(fpout);
+			return -1;
+		}
+	}
+
+	fclose(fpin);
+	fclose(fpout);
+   fprintf(STDERR, "libpng passes test\n");
+
+   return 0;
+}