Add "romfile" code to assist with extract integer config settings.
Add romfile_loadint() function which can be used to extract a
little-endian binary encoded integer from rom.
diff --git a/src/paravirt.c b/src/paravirt.c
index 09e3d23..9cf77de 100644
--- a/src/paravirt.c
+++ b/src/paravirt.c
@@ -409,3 +409,22 @@
data[filesize] = '\0';
return data;
}
+
+// Attempt to load an integer from the given file - return 'defval'
+// if unsuccesful.
+u64
+romfile_loadint(const char *name, u64 defval)
+{
+ u32 file = romfile_find(name);
+ if (!file)
+ return defval;
+
+ int filesize = romfile_size(file);
+ if (!filesize || filesize > sizeof(u64) || (filesize & (filesize-1)))
+ // Doesn't look like a valid integer.
+ return defval;
+
+ u64 val = 0;
+ romfile_copy(file, &val, sizeof(val));
+ return val;
+}