Working

1 files changed, 90 insertions, 0 deletions

diff --git a/pgm-interlace.c b/pgm-interlace.c
new file mode 100644
index 0000000..1870267
--- /dev/null
+++ b/pgm-interlace.c
@@ -0,0 +1,90 @@
+/*
+ * pgm-deinterlace - combine separate, h-interlaced PGMs into one
+ * Copyright (c) 2015 David Phillips <dbphillipsnz@gmail.com>
+ * All rights reserved
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv)
+{
+	unsigned int i, x, y, size, header_size;
+	unsigned int clust_total = argc-1;
+	char buffer[4096];
+	FILE **f = NULL;
+
+	if (argc == 1)
+	{
+		fprintf(stderr, "%s [image 0] [image[1] ...\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	if ( (f = malloc(sizeof(FILE*)*(clust_total)) ) == NULL)
+	{
+		perror("malloc");
+		return EXIT_FAILURE;
+	}
+
+
+	for (i = 1; i < argc; i++)
+	{
+		if ((f[i-1] = fopen(argv[i], "r")) == NULL)
+		{
+			perror("fopen");
+			for ( ; i > 1; i--)
+				fclose(f[i-1]);
+			return EXIT_FAILURE;
+		}
+	}
+
+	/* Fetch sizes from */
+	/* FIXME doesn't check magic value */
+	fgets(buffer, sizeof(buffer), f[0]);
+	fgets(buffer, sizeof(buffer), f[0]);
+	fgets(buffer, sizeof(buffer), f[0]);
+	size = atoi(buffer);
+	fprintf(stderr, "Full image size will be %dx%d, using %d images\n", size, size, clust_total);
+	fgets(buffer, sizeof(buffer), f[0]);
+	header_size = ftell(f[0]);
+
+	for (i = 1; i < argc; i++)
+		fseek(f[i-1], header_size, SEEK_SET);
+
+	/* Output PGM Header */
+	printf("P5\n%d\n%d\n255\n", size, size);
+
+	/* FIXME use a buffer
+	 * FIXME check for EOF */
+	for (y = 0; y < size; y++)
+		for (x = 0; x < size; x++)
+			putchar(fgetc(f[x%clust_total]));
+
+
+	for (i = 1; i < argc; i++)
+		fclose(f[i-1]);
+
+	free(f);
+	return 0;
+}