tools/firmware-utils: mktplinkfw regroup duplicate code

This patch carves out the duplicated code of mktplinfw.c and
mktplinkfw2.c and moves it to mktplinkfw-lib.c

This change is a semantic NOP (the code is unchanged).

To ensure compatibility with gcc-5.x and newer without changing
the code, -fgnu89-inline is added to the build flags for these
two binaries.

Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>

tools/firmware-utils/src/mktplinkfw-lib.c

@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This tool was based on:
+ *   TP-Link WR941 V2 firmware checksum fixing tool.
+ *   Copyright (C) 2008,2009 Wang Jian <lark@linux.net.cn>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>     /* for unlink() */
+#include <libgen.h>
+#include <getopt.h>     /* for getopt() */
+#include <stdarg.h>
+#include <stdbool.h>
+#include <endian.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+#include "mktplinkfw-lib.h"
+#include "md5.h"
+
+extern char *progname;
+static unsigned char jffs2_eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
+
+struct flash_layout *find_layout(struct flash_layout *layouts, const char *id)
+{
+	struct flash_layout *ret;
+	struct flash_layout *l;
+
+	ret = NULL;
+	for (l = layouts; l->id != NULL; l++){
+		if (strcasecmp(id, l->id) == 0) {
+			ret = l;
+			break;
+		}
+	};
+
+	return ret;
+}
+
+void get_md5(const char *data, int size, uint8_t *md5)
+{
+	MD5_CTX ctx;
+
+	MD5_Init(&ctx);
+	MD5_Update(&ctx, data, size);
+	MD5_Final(md5, &ctx);
+}
+
+int get_file_stat(struct file_info *fdata)
+{
+	struct stat st;
+	int res;
+
+	if (fdata->file_name == NULL)
+		return 0;
+
+	res = stat(fdata->file_name, &st);
+	if (res){
+		ERRS("stat failed on %s", fdata->file_name);
+		return res;
+	}
+
+	fdata->file_size = st.st_size;
+	return 0;
+}
+
+int read_to_buf(const struct file_info *fdata, char *buf)
+{
+	FILE *f;
+	int ret = EXIT_FAILURE;
+
+	f = fopen(fdata->file_name, "r");
+	if (f == NULL) {
+		ERRS("could not open \"%s\" for reading", fdata->file_name);
+		goto out;
+	}
+
+	errno = 0;
+	fread(buf, fdata->file_size, 1, f);
+	if (errno != 0) {
+		ERRS("unable to read from file \"%s\"", fdata->file_name);
+		goto out_close;
+	}
+
+	ret = EXIT_SUCCESS;
+
+out_close:
+	fclose(f);
+out:
+	return ret;
+}
+
+int pad_jffs2(char *buf, int currlen, int maxlen)
+{
+	int len;
+	uint32_t pad_mask;
+
+	len = currlen;
+	pad_mask = (64 * 1024);
+	while ((len < maxlen) && (pad_mask != 0)) {
+		uint32_t mask;
+		int i;
+
+		for (i = 10; i < 32; i++) {
+			mask = 1 << i;
+			if (pad_mask & mask)
+				break;
+		}
+
+		len = ALIGN(len, mask);
+
+		for (i = 10; i < 32; i++) {
+			mask = 1 << i;
+			if ((len & (mask - 1)) == 0)
+				pad_mask &= ~mask;
+		}
+
+		for (i = 0; i < sizeof(jffs2_eof_mark); i++)
+			buf[len + i] = jffs2_eof_mark[i];
+
+		len += sizeof(jffs2_eof_mark);
+	}
+
+	return len;
+}
+
+int write_fw(const char *ofname, const char *data, int len)
+{
+	FILE *f;
+	int ret = EXIT_FAILURE;
+
+	f = fopen(ofname, "w");
+	if (f == NULL) {
+		ERRS("could not open \"%s\" for writing", ofname);
+		goto out;
+	}
+
+	errno = 0;
+	fwrite(data, len, 1, f);
+	if (errno) {
+		ERRS("unable to write output file");
+		goto out_flush;
+	}
+
+	DBG("firmware file \"%s\" completed", ofname);
+
+	ret = EXIT_SUCCESS;
+
+out_flush:
+	fflush(f);
+	fclose(f);
+	if (ret != EXIT_SUCCESS) {
+		unlink(ofname);
+	}
+out:
+	return ret;
+}
+
+/* Helper functions to inspect_fw() representing different output formats */
+inline void inspect_fw_pstr(const char *label, const char *str)
+{
+	printf("%-23s: %s\n", label, str);
+}
+
+inline void inspect_fw_phex(const char *label, uint32_t val)
+{
+	printf("%-23s: 0x%08x\n", label, val);
+}
+
+inline void inspect_fw_phexdec(const char *label, uint32_t val)
+{
+	printf("%-23s: 0x%08x / %8u bytes\n", label, val, val);
+}
+
+inline void inspect_fw_pmd5sum(const char *label, const uint8_t *val, const char *text)
+{
+	int i;
+
+	printf("%-23s:", label);
+	for (i=0; i<MD5SUM_LEN; i++)
+		printf(" %02x", val[i]);
+	printf(" %s\n", text);
+}