--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fteeprom/read_eeprom_image.c	Tue Sep 12 20:17:07 2023 +0000
@@ -0,0 +1,72 @@
+/*
+ * This module implements functions for reading FTDI EEPROM images
+ * from a file or from stdin.
+ */
+
+#include <sys/types.h>
+#include <ctype.h>
+#include <string.h>
+#include <strings.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+unsigned eeprom_size;
+u_short eeprom[256];
+
+read_eeprom_common(inf, filename_for_errs)
+	FILE *inf;
+	char *filename_for_errs;
+{
+	char linebuf[1024], *cp;
+	int lineno, rc;
+	unsigned ptr = 0, input_off;
+
+	for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
+		for (cp = linebuf; isspace(*cp); cp++)
+			;
+		if (*cp == '\0' || *cp == '#')
+			continue;
+		if (ptr >= 256) {
+			fprintf(stderr,
+				"%s line %d: maximum EEPROM size exceeded\n",
+				filename_for_errs, lineno);
+			exit(1);
+		}
+		rc = sscanf(linebuf, "%x: %hx %hx %hx %hx %hx %hx %hx %hx",
+			    &input_off, eeprom + ptr, eeprom + ptr + 1,
+			    eeprom + ptr + 2, eeprom + ptr + 3,
+			    eeprom + ptr + 4, eeprom + ptr + 5,
+			    eeprom + ptr + 6, eeprom + ptr + 7);
+		if (rc != 9 || input_off != ptr * 2) {
+			fprintf(stderr, "%s line %d: invalid input\n",
+				filename_for_errs, lineno);
+			exit(1);
+		}
+		ptr += 8;
+	}
+	if (ptr != 64 && ptr != 128 && ptr != 256) {
+		fprintf(stderr, "%s: not an EEPROM image of recognized size\n",
+			filename_for_errs);
+		exit(1);
+	}
+	eeprom_size = ptr;
+}
+
+read_eeprom_from_file(filename)
+	char *filename;
+{
+	FILE *inf;
+
+	inf = fopen(filename, "r");
+	if (!inf) {
+		perror(filename);
+		exit(1);
+	}
+	read_eeprom_common(inf, filename);
+	fclose(inf);
+}
+
+read_eeprom_from_stdin()
+{
+	read_eeprom_common(stdin, "stdin");
+}