[PATCH V3] tplink-safeloader: Patch to handle partitions with alternate names

[Ole Kristian Lona]

    Some devices, specifically Deco M4R-v3 / M5 have partition names that
    deviate from the scheme other devices use. They have an added "@0"
    and "@1" for some patition names. The devices have
    fallback partitions which will be used in case the device
    determines that the primary partition set is unbootable.

    This patch introduces an option to set these alternate partition
    names in the device definition of tplink-safeloader.

    Signed-off-by: Ole Kristian Lona <oklo at oklona.net>
---
 src/tplink-safeloader.c | 58 ++++++++++++++++++++++++++++++++---------
 1 file changed, 45 insertions(+), 13 deletions(-)

diff --git a/src/tplink-safeloader.c b/src/tplink-safeloader.c
index 1c08a33..2adcaf6 100644
--- a/src/tplink-safeloader.c
+++ b/src/tplink-safeloader.c
@@ -48,11 +48,20 @@ struct image_partition_entry {
 
 /** A flash partition table entry */
 struct flash_partition_entry {
-	char *name;
+	const char *name;
 	uint32_t base;
 	uint32_t size;
 };
 
+/** Flash partition names table entry */
+struct factory_partition_names {
+	const char *partition_table;
+	const char *soft_ver;
+	const char *os_image;
+	const char *file_system;
+	const char *extra_para;
+};
+
 /** Partition trailing padding definitions
  * Values 0x00 to 0xff are reserved to indicate the padding value
  * Values from 0x100 are reserved to indicate other behaviour */
@@ -89,6 +98,7 @@ struct device_info {
 	struct flash_partition_entry partitions[MAX_PARTITIONS+1];
 	const char *first_sysupgrade_partition;
 	const char *last_sysupgrade_partition;
+	struct factory_partition_names partition_names;
 };
 
 #define SOFT_VER_TEXT(_t) {.type = SOFT_VER_TYPE_TEXT, .text = _t}
@@ -2962,6 +2972,21 @@ static struct image_partition_entry alloc_image_partition(const char *name, size
 	return entry;
 }
 
+/** Sets up default partition names whenever custom names aren't specified */
+static void set_partition_names(struct device_info *info)
+{
+	if (!info->partition_names.partition_table)
+		info->partition_names.partition_table = "partition-table";
+	if (!info->partition_names.soft_ver)
+		info->partition_names.soft_ver = "soft-version";
+	if (!info->partition_names.os_image)
+		info->partition_names.os_image = "os-image";
+	if (!info->partition_names.file_system)
+		info->partition_names.file_system = "file-system";
+	if (!info->partition_names.extra_para)
+		info->partition_names.extra_para = "extra-para";
+}
+
 /** Frees an image partition */
 static void free_image_partition(struct image_partition_entry entry) {
 	free(entry.data);
@@ -2982,8 +3007,10 @@ static void set_source_date_epoch() {
 }
 
 /** Generates the partition-table partition */
-static struct image_partition_entry make_partition_table(const struct flash_partition_entry *p) {
-	struct image_partition_entry entry = alloc_image_partition("partition-table", 0x800);
+static struct image_partition_entry make_partition_table(const char *name,
+	const struct flash_partition_entry *p)
+{
+	struct image_partition_entry entry = alloc_image_partition(name, 0x800);
 
 	char *s = (char *)entry.data, *end = (char *)(s+entry.size);
 
@@ -3018,14 +3045,14 @@ static inline uint8_t bcd(uint8_t v) {
 
 
 /** Generates the soft-version partition */
-static struct image_partition_entry make_soft_version(
+static struct image_partition_entry make_soft_version(const char *name,
 	const struct device_info *info, uint32_t rev)
 {
 	/** If an info string is provided, use this instead of
 	 * the structured data, and include the null-termination */
 	if (info->soft_ver.type == SOFT_VER_TYPE_TEXT) {
 		uint32_t len = strlen(info->soft_ver.text) + 1;
-		return init_meta_partition_entry("soft-version",
+		return init_meta_partition_entry(name,
 			info->soft_ver.text, len, info->part_trail);
 	}
 
@@ -3055,11 +3082,11 @@ static struct image_partition_entry make_soft_version(
 	};
 
 	if (info->soft_ver_compat_level == 0)
-		return init_meta_partition_entry("soft-version", &s,
+		return init_meta_partition_entry(name, &s,
 			(uint8_t *)(&s.compat_level) - (uint8_t *)(&s),
 			info->part_trail);
 	else
-		return init_meta_partition_entry("soft-version", &s,
+		return init_meta_partition_entry(name, &s,
 			sizeof(s), info->part_trail);
 }
 
@@ -3307,6 +3334,8 @@ static void build_image(const char *output,
 	struct flash_partition_entry *file_system_partition = NULL;
 	size_t firmware_partition_index = 0;
 
+	set_partition_names(info);
+
 	for (i = 0; info->partitions[i].name; i++) {
 		if (!strcmp(info->partitions[i].name, "firmware"))
 		{
@@ -3330,7 +3359,8 @@ static void build_image(const char *output,
 		for (i = MAX_PARTITIONS-1; i >= firmware_partition_index + 1; i--)
 			info->partitions[i+1] = info->partitions[i];
 
-		file_system_partition->name = "file-system";
+		file_system_partition->name = info->partition_names.file_system;
+
 		file_system_partition->base = firmware_partition->base + kernel.st_size;
 
 		/* Align partition start to erase blocks for factory images only */
@@ -3339,15 +3369,17 @@ static void build_image(const char *output,
 
 		file_system_partition->size = firmware_partition->size - file_system_partition->base;
 
-		os_image_partition->name = "os-image";
+		os_image_partition->name = info->partition_names.os_image;
+
 		os_image_partition->size = kernel.st_size;
 	}
 
-	parts[0] = make_partition_table(info->partitions);
-	parts[1] = make_soft_version(info, rev);
+	parts[0] = make_partition_table(info->partition_names.partition_table, info->partitions);
+	parts[1] = make_soft_version(info->partition_names.soft_ver, info, rev);
 	parts[2] = make_support_list(info);
-	parts[3] = read_file("os-image", kernel_image, false, NULL);
-	parts[4] = read_file("file-system", rootfs_image, add_jffs2_eof, file_system_partition);
+	parts[3] = read_file(info->partition_names.os_image, kernel_image, false, NULL);
+	parts[4] = read_file(info->partition_names.file_system, rootfs_image, add_jffs2_eof, file_system_partition);
+
 
 	/* Some devices need the extra-para partition to accept the firmware */
 	if (strcasecmp(info->id, "ARCHER-A6-V3") == 0 ||
-- 
2.32.0