Add hexify

apps/hexify.c

@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <ctype.h>
+
+void print_line(unsigned char * buf, unsigned int width, unsigned int sizer, unsigned int offset) {
+	fprintf(stdout, "%08x: ", sizer);
+	for (unsigned int i = 0; i < width; ) {
+		if (i >= offset) {
+			fprintf(stdout, "  ");
+		} else {
+			fprintf(stdout, "%02x", buf[i]);
+		}
+		i++;
+		if (i == width) break; /* in case of odd width */
+		if (i >= offset) {
+			fprintf(stdout, "   ");
+		} else {
+			fprintf(stdout, "%02x ", buf[i]);
+		}
+		i++;
+	}
+	fprintf(stdout, " ");
+	for (unsigned int i = 0; i < width; i++) {
+		if (i >= offset) {
+			fprintf(stdout, " ");
+		} else {
+			if (isprint(buf[i])) {
+				fprintf(stdout, "%c", buf[i]);
+			} else {
+				fprintf(stdout, ".");
+			}
+		}
+	}
+	fprintf(stdout, "\n");
+}
+
+int main(int argc, char * argv[]) {
+	FILE * f;
+	unsigned int width = 16; /* TODO make configurable */
+	if (argc > 1) {
+		f = fopen(argv[1], "r");
+		if (!f) return 1;
+	} else {
+		f = stdin;
+	}
+
+	unsigned int sizer = 0;
+	unsigned int offset = 0;
+	unsigned char buf[width];
+	while (!feof(f)) {
+		unsigned int r = fread(buf+offset, 1, width-offset, f);
+		offset += r;
+
+		if (offset == width) {
+			print_line(buf, width, sizer, offset);
+			offset = 0;
+			sizer += width;
+		}
+	}
+
+	if (offset != 0) {
+		print_line(buf, width, sizer, offset);
+	}
+	return 0;
+}