Add C build tools.

tools/palette.c

@@ -0,0 +1,89 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+void usage(void) {
+	printf("Usage: palette palfile\n");
+	exit(1);
+}
+
+void print_rgb(uint16_t word) {
+	int r, g, b;
+	r = word & 0x1f;
+	g = (word >> 5) & 0x1f;
+	b = (word >> 10) & 0x1f;
+	printf("\tRGB %2d, %2d, %2d\n", r, g, b);
+}
+
+void print_pokemon_palette(char* palette_filename) {
+	FILE* f;
+	uint8_t bytes[4];
+
+	f = fopen(palette_filename, "rb");
+	if (f == NULL) {
+		fprintf(stderr, "failed to open file %s\n", palette_filename);
+		exit(1);
+	}
+
+	fseek(f, 2, SEEK_SET);
+	fread(bytes, 1, 4, f);
+	fclose(f);
+
+	print_rgb((bytes[1] << 8) | bytes[0]);
+	print_rgb((bytes[3] << 8) | bytes[2]);
+}
+
+void print_palette(char* palette_filename) {
+	FILE* f;
+	uint8_t* bytes;
+	long size;
+	int i;
+
+	f = fopen(palette_filename, "rb");
+	if (f == NULL) {
+		fprintf(stderr, "failed to open file %s\n", palette_filename);
+		exit(1);
+	}
+
+	fseek(f, 0, SEEK_END);
+	size = ftell(f);
+	rewind(f);
+
+	bytes = malloc(size);
+
+	fseek(f, 0, SEEK_SET);
+	fread(bytes, 1, size, f);
+	fclose(f);
+
+	for (i = 0; i + 1 < size; i += 2) {
+		print_rgb((bytes[i + 1] << 8) | bytes[i]);
+	}
+}
+
+int main(int argc, char* argv[]) {
+	int ch;
+	bool pokemon;
+
+	while ((ch = getopt(argc, argv, "p")) != -1) {
+		switch (ch) {
+			case 'p':
+				pokemon = true;
+				break;
+			default:
+				usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+	if (argc < 1) {
+		usage();
+	}
+	if (pokemon) {
+		print_pokemon_palette(argv[0]);
+	} else {
+		print_palette(argv[0]);
+	}
+	return 0;
+}