[SeaBIOS] [PATCH 4/6] bios_date: Add bios date checks in checkrom.py

[Sam Eiderman]

Check that only one bios date appears in the final ROM.

The check simulates nt!CmpGetBiosDate() in order to ensure that Windows
sees the correct date.

For reference implementation of nt!CmpGetBiosDate(), see ReactOS:
https://doxygen.reactos.org/d5/dd2/i386_2cmhardwr_8c.html

Reviewed-by: Konrad Rzeszutek Wilk 
Reviewed-by: Arbel Moshe 
Signed-off-by: Sam Eiderman 
Signed-off-by: Liran Alon 
---
 scripts/checkrom.py | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/scripts/checkrom.py b/scripts/checkrom.py
index aced5e2c..98cdfa7f 100755
--- a/scripts/checkrom.py
+++ b/scripts/checkrom.py
@@ -17,6 +17,23 @@ def checksum(data, start, size, csum):
     sumbyte = buildrom.checksum(data[start:start+size])
     return subst(data, start+csum, sumbyte)

+def check_windows_bios_date(rawdata):
+    dates = []
+    for i in xrange(len(rawdata)):
+        if (rawdata[i+0:i+2].isdigit() and
+                rawdata[i+2] == '/' and
+                rawdata[i+3:i+5].isdigit() and
+                rawdata[i+5] == '/' and
+                rawdata[i+6:i+8].isdigit()):
+            dates.append(rawdata[i:i+8])
+    if len(dates) > 1:
+        print("Warning!  More than one date was detected in rom.")
+        print("   This may cause Windows OS to report incorrect date:")
+        print("   %s" % (dates, ))
+    if len(dates) == 0:
+        print("Warning!  No dates were detected in rom.")
+        print("   This may cause Windows OS to report incorrect date.")
+
 def main():
     # Get args
     objinfo, finalsize, rawfile, outfile = sys.argv[1:]
@@ -46,6 +63,8 @@ def main():
         sys.exit(1)

# Sanity checks
+    check_windows_bios_date(rawdata)
+
     start = symbols['code32flat_start'].offset
     end = symbols['code32flat_end'].offset
     expend = layoutrom.BUILD_BIOS_ADDR + layoutrom.BUILD_BIOS_SIZE