layout: Hoist get_region_range() into libflashrom API

While using the libflashrom API to read specific regions
there is no currently no general way to find the offset
into the read buffer of the expected region.

flashrom_layout_include_region() probably should have
returned the region offset and size if it was included.
However to avoid a change in API signature we can instead
hoist up get_region_range() into the API to be called after.

BUG=b:207808292
TEST=`make` && tested in porting cbfstool use-case.

Change-Id: I8cf95b5eaec943a51d0ea668f26a56bf6d6b4446
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/60881
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sam McNally <sammc@google.com>

1 files changed, 23 insertions, 12 deletions

diff --git a/layout.c b/layout.c
index 534debaa..05bee19c 100644
--- a/layout.c
+++ b/layout.c
@@ -188,18 +188,6 @@ static int find_romentry(struct flashrom_layout *const l, char *name, char *file
 	return 0;
 }
 
-int get_region_range(struct flashrom_layout *const l, const char *name,
-		     unsigned int *start, unsigned int *len)
-{
-	const struct romentry *const entry = _layout_entry_by_name(l, name);
-	if (entry) {
-		*start = entry->start;
-		*len = entry->end - entry->start + 1;
-		return 0;
-	}
-	return 1;
-}
-
 /* process -i arguments
  * returns 0 to indicate success, >0 to indicate failure
  */
@@ -445,6 +433,29 @@ int flashrom_layout_include_region(struct flashrom_layout *const layout, const c
 }
 
 /**
+ * @brief Get given region's offset and length.
+ *
+ * @param layout The layout to alter.
+ * @param name   The name of the region.
+ * @param start  The start address to be written.
+ * @param len    The length of the region to be written.
+ *
+ * @return 0 on success,
+ *         1 if the given name can't be found.
+ */
+int flashrom_layout_get_region_range(struct flashrom_layout *const l, const char *name,
+			      unsigned int *start, unsigned int *len)
+{
+	const struct romentry *const entry = _layout_entry_by_name(l, name);
+	if (entry) {
+		*start = entry->start;
+		*len = entry->end - entry->start + 1;
+		return 0;
+	}
+	return 1;
+}
+
+/**
  * @brief Free a layout.
  *
  * @param layout Layout to free.